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7b9716a0f1
The variant init function may need to add a mmc_host_ops, for example to add the execute_tuning support if this feature is available. This patch adds mmc_host_ops pointer in mmci struct. Signed-off-by: Ludovic Barre <ludovic.barre@st.com> Link: https://lore.kernel.org/r/20200128090636.13689-4-ludovic.barre@st.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2365 lines
59 KiB
C
2365 lines
59 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
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*
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* Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
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* Copyright (C) 2010 ST-Ericsson SA
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/highmem.h>
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#include <linux/log2.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/pm.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/amba/bus.h>
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#include <linux/clk.h>
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#include <linux/scatterlist.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/amba/mmci.h>
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#include <linux/pm_runtime.h>
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#include <linux/types.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/reset.h>
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#include <asm/div64.h>
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#include <asm/io.h>
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#include "mmci.h"
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#define DRIVER_NAME "mmci-pl18x"
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static void mmci_variant_init(struct mmci_host *host);
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static void ux500_variant_init(struct mmci_host *host);
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static void ux500v2_variant_init(struct mmci_host *host);
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static unsigned int fmax = 515633;
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static struct variant_data variant_arm = {
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.fifosize = 16 * 4,
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.fifohalfsize = 8 * 4,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 16,
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.datactrl_blocksz = 11,
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.pwrreg_powerup = MCI_PWR_UP,
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.f_max = 100000000,
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.reversed_irq_handling = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_ROD,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_arm_extended_fifo = {
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.fifosize = 128 * 4,
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.fifohalfsize = 64 * 4,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 16,
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.datactrl_blocksz = 11,
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.pwrreg_powerup = MCI_PWR_UP,
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.f_max = 100000000,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_ROD,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_arm_extended_fifo_hwfc = {
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.fifosize = 128 * 4,
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.fifohalfsize = 64 * 4,
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.clkreg_enable = MCI_ARM_HWFCEN,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 16,
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.datactrl_blocksz = 11,
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.pwrreg_powerup = MCI_PWR_UP,
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.f_max = 100000000,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_ROD,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_u300 = {
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.fifosize = 16 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg_enable = MCI_ST_U300_HWFCEN,
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.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 16,
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.datactrl_blocksz = 11,
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.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
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.st_sdio = true,
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.pwrreg_powerup = MCI_PWR_ON,
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.f_max = 100000000,
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.signal_direction = true,
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.pwrreg_clkgate = true,
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.pwrreg_nopower = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_OD,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_nomadik = {
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.fifosize = 16 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg = MCI_CLK_ENABLE,
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.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 24,
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.datactrl_blocksz = 11,
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.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
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.st_sdio = true,
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.st_clkdiv = true,
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.pwrreg_powerup = MCI_PWR_ON,
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.f_max = 100000000,
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.signal_direction = true,
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.pwrreg_clkgate = true,
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.pwrreg_nopower = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_OD,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_ux500 = {
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.fifosize = 30 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg = MCI_CLK_ENABLE,
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.clkreg_enable = MCI_ST_UX500_HWFCEN,
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.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
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.clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datalength_bits = 24,
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.datactrl_blocksz = 11,
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.datactrl_any_blocksz = true,
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.dma_power_of_2 = true,
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.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
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.st_sdio = true,
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.st_clkdiv = true,
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.pwrreg_powerup = MCI_PWR_ON,
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.f_max = 100000000,
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.signal_direction = true,
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.pwrreg_clkgate = true,
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.busy_detect = true,
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.busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
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.busy_detect_flag = MCI_ST_CARDBUSY,
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.busy_detect_mask = MCI_ST_BUSYENDMASK,
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.pwrreg_nopower = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_OD,
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.init = ux500_variant_init,
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};
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static struct variant_data variant_ux500v2 = {
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.fifosize = 30 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg = MCI_CLK_ENABLE,
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.clkreg_enable = MCI_ST_UX500_HWFCEN,
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.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
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.clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.datactrl_mask_ddrmode = MCI_DPSM_ST_DDRMODE,
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.datalength_bits = 24,
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.datactrl_blocksz = 11,
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.datactrl_any_blocksz = true,
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.dma_power_of_2 = true,
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.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
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.st_sdio = true,
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.st_clkdiv = true,
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.pwrreg_powerup = MCI_PWR_ON,
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.f_max = 100000000,
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.signal_direction = true,
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.pwrreg_clkgate = true,
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.busy_detect = true,
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.busy_dpsm_flag = MCI_DPSM_ST_BUSYMODE,
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.busy_detect_flag = MCI_ST_CARDBUSY,
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.busy_detect_mask = MCI_ST_BUSYENDMASK,
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.pwrreg_nopower = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_OD,
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.init = ux500v2_variant_init,
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};
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static struct variant_data variant_stm32 = {
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.fifosize = 32 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg = MCI_CLK_ENABLE,
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.clkreg_enable = MCI_ST_UX500_HWFCEN,
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.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
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.clkreg_neg_edge_enable = MCI_ST_UX500_NEG_EDGE,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.datalength_bits = 24,
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.datactrl_blocksz = 11,
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.datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN,
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.st_sdio = true,
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.st_clkdiv = true,
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.pwrreg_powerup = MCI_PWR_ON,
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.f_max = 48000000,
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.pwrreg_clkgate = true,
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.pwrreg_nopower = true,
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.init = mmci_variant_init,
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};
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static struct variant_data variant_stm32_sdmmc = {
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.fifosize = 16 * 4,
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.fifohalfsize = 8 * 4,
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.f_max = 208000000,
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.stm32_clkdiv = true,
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.cmdreg_cpsm_enable = MCI_CPSM_STM32_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_STM32_LRSP_CRC,
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.cmdreg_srsp_crc = MCI_CPSM_STM32_SRSP_CRC,
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.cmdreg_srsp = MCI_CPSM_STM32_SRSP,
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.cmdreg_stop = MCI_CPSM_STM32_CMDSTOP,
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.data_cmd_enable = MCI_CPSM_STM32_CMDTRANS,
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.irq_pio_mask = MCI_IRQ_PIO_STM32_MASK,
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.datactrl_first = true,
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.datacnt_useless = true,
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.datalength_bits = 25,
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.datactrl_blocksz = 14,
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.datactrl_any_blocksz = true,
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.stm32_idmabsize_mask = GENMASK(12, 5),
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.busy_timeout = true,
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.busy_detect = true,
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.busy_detect_flag = MCI_STM32_BUSYD0,
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.busy_detect_mask = MCI_STM32_BUSYD0ENDMASK,
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.init = sdmmc_variant_init,
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};
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static struct variant_data variant_qcom = {
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.fifosize = 16 * 4,
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.fifohalfsize = 8 * 4,
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.clkreg = MCI_CLK_ENABLE,
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.clkreg_enable = MCI_QCOM_CLK_FLOWENA |
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MCI_QCOM_CLK_SELECT_IN_FBCLK,
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.clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
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.datactrl_mask_ddrmode = MCI_QCOM_CLK_SELECT_IN_DDR_MODE,
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.cmdreg_cpsm_enable = MCI_CPSM_ENABLE,
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.cmdreg_lrsp_crc = MCI_CPSM_RESPONSE | MCI_CPSM_LONGRSP,
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.cmdreg_srsp_crc = MCI_CPSM_RESPONSE,
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.cmdreg_srsp = MCI_CPSM_RESPONSE,
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.data_cmd_enable = MCI_CPSM_QCOM_DATCMD,
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.datalength_bits = 24,
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.datactrl_blocksz = 11,
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.datactrl_any_blocksz = true,
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.pwrreg_powerup = MCI_PWR_UP,
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.f_max = 208000000,
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.explicit_mclk_control = true,
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.qcom_fifo = true,
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.qcom_dml = true,
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.mmcimask1 = true,
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.irq_pio_mask = MCI_IRQ_PIO_MASK,
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.start_err = MCI_STARTBITERR,
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.opendrain = MCI_ROD,
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.init = qcom_variant_init,
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};
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/* Busy detection for the ST Micro variant */
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static int mmci_card_busy(struct mmc_host *mmc)
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{
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struct mmci_host *host = mmc_priv(mmc);
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unsigned long flags;
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int busy = 0;
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spin_lock_irqsave(&host->lock, flags);
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if (readl(host->base + MMCISTATUS) & host->variant->busy_detect_flag)
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busy = 1;
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spin_unlock_irqrestore(&host->lock, flags);
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return busy;
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}
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static void mmci_reg_delay(struct mmci_host *host)
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{
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/*
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* According to the spec, at least three feedback clock cycles
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* of max 52 MHz must pass between two writes to the MMCICLOCK reg.
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* Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
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* Worst delay time during card init is at 100 kHz => 30 us.
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* Worst delay time when up and running is at 25 MHz => 120 ns.
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*/
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if (host->cclk < 25000000)
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udelay(30);
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else
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ndelay(120);
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}
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/*
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* This must be called with host->lock held
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*/
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void mmci_write_clkreg(struct mmci_host *host, u32 clk)
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{
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if (host->clk_reg != clk) {
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host->clk_reg = clk;
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writel(clk, host->base + MMCICLOCK);
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}
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}
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/*
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* This must be called with host->lock held
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*/
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void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
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{
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if (host->pwr_reg != pwr) {
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host->pwr_reg = pwr;
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writel(pwr, host->base + MMCIPOWER);
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}
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}
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/*
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* This must be called with host->lock held
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*/
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static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
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{
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/* Keep busy mode in DPSM if enabled */
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datactrl |= host->datactrl_reg & host->variant->busy_dpsm_flag;
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if (host->datactrl_reg != datactrl) {
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host->datactrl_reg = datactrl;
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writel(datactrl, host->base + MMCIDATACTRL);
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}
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}
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/*
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* This must be called with host->lock held
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*/
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static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
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{
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struct variant_data *variant = host->variant;
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u32 clk = variant->clkreg;
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/* Make sure cclk reflects the current calculated clock */
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host->cclk = 0;
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if (desired) {
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if (variant->explicit_mclk_control) {
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host->cclk = host->mclk;
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} else if (desired >= host->mclk) {
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clk = MCI_CLK_BYPASS;
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if (variant->st_clkdiv)
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clk |= MCI_ST_UX500_NEG_EDGE;
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host->cclk = host->mclk;
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} else if (variant->st_clkdiv) {
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/*
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* DB8500 TRM says f = mclk / (clkdiv + 2)
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* => clkdiv = (mclk / f) - 2
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* Round the divider up so we don't exceed the max
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* frequency
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*/
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clk = DIV_ROUND_UP(host->mclk, desired) - 2;
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if (clk >= 256)
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clk = 255;
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host->cclk = host->mclk / (clk + 2);
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} else {
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/*
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* PL180 TRM says f = mclk / (2 * (clkdiv + 1))
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* => clkdiv = mclk / (2 * f) - 1
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*/
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clk = host->mclk / (2 * desired) - 1;
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if (clk >= 256)
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clk = 255;
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host->cclk = host->mclk / (2 * (clk + 1));
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}
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clk |= variant->clkreg_enable;
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clk |= MCI_CLK_ENABLE;
|
|
/* This hasn't proven to be worthwhile */
|
|
/* clk |= MCI_CLK_PWRSAVE; */
|
|
}
|
|
|
|
/* Set actual clock for debug */
|
|
host->mmc->actual_clock = host->cclk;
|
|
|
|
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
|
|
clk |= MCI_4BIT_BUS;
|
|
if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
|
|
clk |= variant->clkreg_8bit_bus_enable;
|
|
|
|
if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
|
|
host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
|
|
clk |= variant->clkreg_neg_edge_enable;
|
|
|
|
mmci_write_clkreg(host, clk);
|
|
}
|
|
|
|
static void mmci_dma_release(struct mmci_host *host)
|
|
{
|
|
if (host->ops && host->ops->dma_release)
|
|
host->ops->dma_release(host);
|
|
|
|
host->use_dma = false;
|
|
}
|
|
|
|
static void mmci_dma_setup(struct mmci_host *host)
|
|
{
|
|
if (!host->ops || !host->ops->dma_setup)
|
|
return;
|
|
|
|
if (host->ops->dma_setup(host))
|
|
return;
|
|
|
|
/* initialize pre request cookie */
|
|
host->next_cookie = 1;
|
|
|
|
host->use_dma = true;
|
|
}
|
|
|
|
/*
|
|
* Validate mmc prerequisites
|
|
*/
|
|
static int mmci_validate_data(struct mmci_host *host,
|
|
struct mmc_data *data)
|
|
{
|
|
struct variant_data *variant = host->variant;
|
|
|
|
if (!data)
|
|
return 0;
|
|
if (!is_power_of_2(data->blksz) && !variant->datactrl_any_blocksz) {
|
|
dev_err(mmc_dev(host->mmc),
|
|
"unsupported block size (%d bytes)\n", data->blksz);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (host->ops && host->ops->validate_data)
|
|
return host->ops->validate_data(host, data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmci_prep_data(struct mmci_host *host, struct mmc_data *data, bool next)
|
|
{
|
|
int err;
|
|
|
|
if (!host->ops || !host->ops->prep_data)
|
|
return 0;
|
|
|
|
err = host->ops->prep_data(host, data, next);
|
|
|
|
if (next && !err)
|
|
data->host_cookie = ++host->next_cookie < 0 ?
|
|
1 : host->next_cookie;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void mmci_unprep_data(struct mmci_host *host, struct mmc_data *data,
|
|
int err)
|
|
{
|
|
if (host->ops && host->ops->unprep_data)
|
|
host->ops->unprep_data(host, data, err);
|
|
|
|
data->host_cookie = 0;
|
|
}
|
|
|
|
static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
WARN_ON(data->host_cookie && data->host_cookie != host->next_cookie);
|
|
|
|
if (host->ops && host->ops->get_next_data)
|
|
host->ops->get_next_data(host, data);
|
|
}
|
|
|
|
static int mmci_dma_start(struct mmci_host *host, unsigned int datactrl)
|
|
{
|
|
struct mmc_data *data = host->data;
|
|
int ret;
|
|
|
|
if (!host->use_dma)
|
|
return -EINVAL;
|
|
|
|
ret = mmci_prep_data(host, data, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!host->ops || !host->ops->dma_start)
|
|
return -EINVAL;
|
|
|
|
/* Okay, go for it. */
|
|
dev_vdbg(mmc_dev(host->mmc),
|
|
"Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
|
|
data->sg_len, data->blksz, data->blocks, data->flags);
|
|
|
|
ret = host->ops->dma_start(host, &datactrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Trigger the DMA transfer */
|
|
mmci_write_datactrlreg(host, datactrl);
|
|
|
|
/*
|
|
* Let the MMCI say when the data is ended and it's time
|
|
* to fire next DMA request. When that happens, MMCI will
|
|
* call mmci_data_end()
|
|
*/
|
|
writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
|
|
host->base + MMCIMASK0);
|
|
return 0;
|
|
}
|
|
|
|
static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
if (!host->use_dma)
|
|
return;
|
|
|
|
if (host->ops && host->ops->dma_finalize)
|
|
host->ops->dma_finalize(host, data);
|
|
}
|
|
|
|
static void mmci_dma_error(struct mmci_host *host)
|
|
{
|
|
if (!host->use_dma)
|
|
return;
|
|
|
|
if (host->ops && host->ops->dma_error)
|
|
host->ops->dma_error(host);
|
|
}
|
|
|
|
static void
|
|
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
|
|
{
|
|
writel(0, host->base + MMCICOMMAND);
|
|
|
|
BUG_ON(host->data);
|
|
|
|
host->mrq = NULL;
|
|
host->cmd = NULL;
|
|
|
|
mmc_request_done(host->mmc, mrq);
|
|
}
|
|
|
|
static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
|
|
{
|
|
void __iomem *base = host->base;
|
|
struct variant_data *variant = host->variant;
|
|
|
|
if (host->singleirq) {
|
|
unsigned int mask0 = readl(base + MMCIMASK0);
|
|
|
|
mask0 &= ~variant->irq_pio_mask;
|
|
mask0 |= mask;
|
|
|
|
writel(mask0, base + MMCIMASK0);
|
|
}
|
|
|
|
if (variant->mmcimask1)
|
|
writel(mask, base + MMCIMASK1);
|
|
|
|
host->mask1_reg = mask;
|
|
}
|
|
|
|
static void mmci_stop_data(struct mmci_host *host)
|
|
{
|
|
mmci_write_datactrlreg(host, 0);
|
|
mmci_set_mask1(host, 0);
|
|
host->data = NULL;
|
|
}
|
|
|
|
static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
unsigned int flags = SG_MITER_ATOMIC;
|
|
|
|
if (data->flags & MMC_DATA_READ)
|
|
flags |= SG_MITER_TO_SG;
|
|
else
|
|
flags |= SG_MITER_FROM_SG;
|
|
|
|
sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
|
|
}
|
|
|
|
static u32 mmci_get_dctrl_cfg(struct mmci_host *host)
|
|
{
|
|
return MCI_DPSM_ENABLE | mmci_dctrl_blksz(host);
|
|
}
|
|
|
|
static u32 ux500v2_get_dctrl_cfg(struct mmci_host *host)
|
|
{
|
|
return MCI_DPSM_ENABLE | (host->data->blksz << 16);
|
|
}
|
|
|
|
static bool ux500_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
|
|
{
|
|
void __iomem *base = host->base;
|
|
|
|
/*
|
|
* Before unmasking for the busy end IRQ, confirm that the
|
|
* command was sent successfully. To keep track of having a
|
|
* command in-progress, waiting for busy signaling to end,
|
|
* store the status in host->busy_status.
|
|
*
|
|
* Note that, the card may need a couple of clock cycles before
|
|
* it starts signaling busy on DAT0, hence re-read the
|
|
* MMCISTATUS register here, to allow the busy bit to be set.
|
|
* Potentially we may even need to poll the register for a
|
|
* while, to allow it to be set, but tests indicates that it
|
|
* isn't needed.
|
|
*/
|
|
if (!host->busy_status && !(status & err_msk) &&
|
|
(readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
|
|
writel(readl(base + MMCIMASK0) |
|
|
host->variant->busy_detect_mask,
|
|
base + MMCIMASK0);
|
|
|
|
host->busy_status = status & (MCI_CMDSENT | MCI_CMDRESPEND);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* If there is a command in-progress that has been successfully
|
|
* sent, then bail out if busy status is set and wait for the
|
|
* busy end IRQ.
|
|
*
|
|
* Note that, the HW triggers an IRQ on both edges while
|
|
* monitoring DAT0 for busy completion, but there is only one
|
|
* status bit in MMCISTATUS for the busy state. Therefore
|
|
* both the start and the end interrupts needs to be cleared,
|
|
* one after the other. So, clear the busy start IRQ here.
|
|
*/
|
|
if (host->busy_status &&
|
|
(status & host->variant->busy_detect_flag)) {
|
|
writel(host->variant->busy_detect_mask, base + MMCICLEAR);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* If there is a command in-progress that has been successfully
|
|
* sent and the busy bit isn't set, it means we have received
|
|
* the busy end IRQ. Clear and mask the IRQ, then continue to
|
|
* process the command.
|
|
*/
|
|
if (host->busy_status) {
|
|
writel(host->variant->busy_detect_mask, base + MMCICLEAR);
|
|
|
|
writel(readl(base + MMCIMASK0) &
|
|
~host->variant->busy_detect_mask, base + MMCIMASK0);
|
|
host->busy_status = 0;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* All the DMA operation mode stuff goes inside this ifdef.
|
|
* This assumes that you have a generic DMA device interface,
|
|
* no custom DMA interfaces are supported.
|
|
*/
|
|
#ifdef CONFIG_DMA_ENGINE
|
|
struct mmci_dmae_next {
|
|
struct dma_async_tx_descriptor *desc;
|
|
struct dma_chan *chan;
|
|
};
|
|
|
|
struct mmci_dmae_priv {
|
|
struct dma_chan *cur;
|
|
struct dma_chan *rx_channel;
|
|
struct dma_chan *tx_channel;
|
|
struct dma_async_tx_descriptor *desc_current;
|
|
struct mmci_dmae_next next_data;
|
|
};
|
|
|
|
int mmci_dmae_setup(struct mmci_host *host)
|
|
{
|
|
const char *rxname, *txname;
|
|
struct mmci_dmae_priv *dmae;
|
|
|
|
dmae = devm_kzalloc(mmc_dev(host->mmc), sizeof(*dmae), GFP_KERNEL);
|
|
if (!dmae)
|
|
return -ENOMEM;
|
|
|
|
host->dma_priv = dmae;
|
|
|
|
dmae->rx_channel = dma_request_chan(mmc_dev(host->mmc), "rx");
|
|
if (IS_ERR(dmae->rx_channel)) {
|
|
int ret = PTR_ERR(dmae->rx_channel);
|
|
dmae->rx_channel = NULL;
|
|
return ret;
|
|
}
|
|
|
|
dmae->tx_channel = dma_request_chan(mmc_dev(host->mmc), "tx");
|
|
if (IS_ERR(dmae->tx_channel)) {
|
|
if (PTR_ERR(dmae->tx_channel) == -EPROBE_DEFER)
|
|
dev_warn(mmc_dev(host->mmc),
|
|
"Deferred probe for TX channel ignored\n");
|
|
dmae->tx_channel = NULL;
|
|
}
|
|
|
|
/*
|
|
* If only an RX channel is specified, the driver will
|
|
* attempt to use it bidirectionally, however if it is
|
|
* is specified but cannot be located, DMA will be disabled.
|
|
*/
|
|
if (dmae->rx_channel && !dmae->tx_channel)
|
|
dmae->tx_channel = dmae->rx_channel;
|
|
|
|
if (dmae->rx_channel)
|
|
rxname = dma_chan_name(dmae->rx_channel);
|
|
else
|
|
rxname = "none";
|
|
|
|
if (dmae->tx_channel)
|
|
txname = dma_chan_name(dmae->tx_channel);
|
|
else
|
|
txname = "none";
|
|
|
|
dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
|
|
rxname, txname);
|
|
|
|
/*
|
|
* Limit the maximum segment size in any SG entry according to
|
|
* the parameters of the DMA engine device.
|
|
*/
|
|
if (dmae->tx_channel) {
|
|
struct device *dev = dmae->tx_channel->device->dev;
|
|
unsigned int max_seg_size = dma_get_max_seg_size(dev);
|
|
|
|
if (max_seg_size < host->mmc->max_seg_size)
|
|
host->mmc->max_seg_size = max_seg_size;
|
|
}
|
|
if (dmae->rx_channel) {
|
|
struct device *dev = dmae->rx_channel->device->dev;
|
|
unsigned int max_seg_size = dma_get_max_seg_size(dev);
|
|
|
|
if (max_seg_size < host->mmc->max_seg_size)
|
|
host->mmc->max_seg_size = max_seg_size;
|
|
}
|
|
|
|
if (!dmae->tx_channel || !dmae->rx_channel) {
|
|
mmci_dmae_release(host);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is used in or so inline it
|
|
* so it can be discarded.
|
|
*/
|
|
void mmci_dmae_release(struct mmci_host *host)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
|
|
if (dmae->rx_channel)
|
|
dma_release_channel(dmae->rx_channel);
|
|
if (dmae->tx_channel)
|
|
dma_release_channel(dmae->tx_channel);
|
|
dmae->rx_channel = dmae->tx_channel = NULL;
|
|
}
|
|
|
|
static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
struct dma_chan *chan;
|
|
|
|
if (data->flags & MMC_DATA_READ)
|
|
chan = dmae->rx_channel;
|
|
else
|
|
chan = dmae->tx_channel;
|
|
|
|
dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
|
|
mmc_get_dma_dir(data));
|
|
}
|
|
|
|
void mmci_dmae_error(struct mmci_host *host)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
|
|
if (!dma_inprogress(host))
|
|
return;
|
|
|
|
dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
|
|
dmaengine_terminate_all(dmae->cur);
|
|
host->dma_in_progress = false;
|
|
dmae->cur = NULL;
|
|
dmae->desc_current = NULL;
|
|
host->data->host_cookie = 0;
|
|
|
|
mmci_dma_unmap(host, host->data);
|
|
}
|
|
|
|
void mmci_dmae_finalize(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
u32 status;
|
|
int i;
|
|
|
|
if (!dma_inprogress(host))
|
|
return;
|
|
|
|
/* Wait up to 1ms for the DMA to complete */
|
|
for (i = 0; ; i++) {
|
|
status = readl(host->base + MMCISTATUS);
|
|
if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
|
|
break;
|
|
udelay(10);
|
|
}
|
|
|
|
/*
|
|
* Check to see whether we still have some data left in the FIFO -
|
|
* this catches DMA controllers which are unable to monitor the
|
|
* DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
|
|
* contiguous buffers. On TX, we'll get a FIFO underrun error.
|
|
*/
|
|
if (status & MCI_RXDATAAVLBLMASK) {
|
|
mmci_dma_error(host);
|
|
if (!data->error)
|
|
data->error = -EIO;
|
|
} else if (!data->host_cookie) {
|
|
mmci_dma_unmap(host, data);
|
|
}
|
|
|
|
/*
|
|
* Use of DMA with scatter-gather is impossible.
|
|
* Give up with DMA and switch back to PIO mode.
|
|
*/
|
|
if (status & MCI_RXDATAAVLBLMASK) {
|
|
dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
|
|
mmci_dma_release(host);
|
|
}
|
|
|
|
host->dma_in_progress = false;
|
|
dmae->cur = NULL;
|
|
dmae->desc_current = NULL;
|
|
}
|
|
|
|
/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
|
|
static int _mmci_dmae_prep_data(struct mmci_host *host, struct mmc_data *data,
|
|
struct dma_chan **dma_chan,
|
|
struct dma_async_tx_descriptor **dma_desc)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
struct variant_data *variant = host->variant;
|
|
struct dma_slave_config conf = {
|
|
.src_addr = host->phybase + MMCIFIFO,
|
|
.dst_addr = host->phybase + MMCIFIFO,
|
|
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
|
|
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
|
|
.src_maxburst = variant->fifohalfsize >> 2, /* # of words */
|
|
.dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
|
|
.device_fc = false,
|
|
};
|
|
struct dma_chan *chan;
|
|
struct dma_device *device;
|
|
struct dma_async_tx_descriptor *desc;
|
|
int nr_sg;
|
|
unsigned long flags = DMA_CTRL_ACK;
|
|
|
|
if (data->flags & MMC_DATA_READ) {
|
|
conf.direction = DMA_DEV_TO_MEM;
|
|
chan = dmae->rx_channel;
|
|
} else {
|
|
conf.direction = DMA_MEM_TO_DEV;
|
|
chan = dmae->tx_channel;
|
|
}
|
|
|
|
/* If there's no DMA channel, fall back to PIO */
|
|
if (!chan)
|
|
return -EINVAL;
|
|
|
|
/* If less than or equal to the fifo size, don't bother with DMA */
|
|
if (data->blksz * data->blocks <= variant->fifosize)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* This is necessary to get SDIO working on the Ux500. We do not yet
|
|
* know if this is a bug in:
|
|
* - The Ux500 DMA controller (DMA40)
|
|
* - The MMCI DMA interface on the Ux500
|
|
* some power of two blocks (such as 64 bytes) are sent regularly
|
|
* during SDIO traffic and those work fine so for these we enable DMA
|
|
* transfers.
|
|
*/
|
|
if (host->variant->dma_power_of_2 && !is_power_of_2(data->blksz))
|
|
return -EINVAL;
|
|
|
|
device = chan->device;
|
|
nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len,
|
|
mmc_get_dma_dir(data));
|
|
if (nr_sg == 0)
|
|
return -EINVAL;
|
|
|
|
if (host->variant->qcom_dml)
|
|
flags |= DMA_PREP_INTERRUPT;
|
|
|
|
dmaengine_slave_config(chan, &conf);
|
|
desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
|
|
conf.direction, flags);
|
|
if (!desc)
|
|
goto unmap_exit;
|
|
|
|
*dma_chan = chan;
|
|
*dma_desc = desc;
|
|
|
|
return 0;
|
|
|
|
unmap_exit:
|
|
dma_unmap_sg(device->dev, data->sg, data->sg_len,
|
|
mmc_get_dma_dir(data));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int mmci_dmae_prep_data(struct mmci_host *host,
|
|
struct mmc_data *data,
|
|
bool next)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
struct mmci_dmae_next *nd = &dmae->next_data;
|
|
|
|
if (!host->use_dma)
|
|
return -EINVAL;
|
|
|
|
if (next)
|
|
return _mmci_dmae_prep_data(host, data, &nd->chan, &nd->desc);
|
|
/* Check if next job is already prepared. */
|
|
if (dmae->cur && dmae->desc_current)
|
|
return 0;
|
|
|
|
/* No job were prepared thus do it now. */
|
|
return _mmci_dmae_prep_data(host, data, &dmae->cur,
|
|
&dmae->desc_current);
|
|
}
|
|
|
|
int mmci_dmae_start(struct mmci_host *host, unsigned int *datactrl)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
int ret;
|
|
|
|
host->dma_in_progress = true;
|
|
ret = dma_submit_error(dmaengine_submit(dmae->desc_current));
|
|
if (ret < 0) {
|
|
host->dma_in_progress = false;
|
|
return ret;
|
|
}
|
|
dma_async_issue_pending(dmae->cur);
|
|
|
|
*datactrl |= MCI_DPSM_DMAENABLE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mmci_dmae_get_next_data(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
struct mmci_dmae_next *next = &dmae->next_data;
|
|
|
|
if (!host->use_dma)
|
|
return;
|
|
|
|
WARN_ON(!data->host_cookie && (next->desc || next->chan));
|
|
|
|
dmae->desc_current = next->desc;
|
|
dmae->cur = next->chan;
|
|
next->desc = NULL;
|
|
next->chan = NULL;
|
|
}
|
|
|
|
void mmci_dmae_unprep_data(struct mmci_host *host,
|
|
struct mmc_data *data, int err)
|
|
|
|
{
|
|
struct mmci_dmae_priv *dmae = host->dma_priv;
|
|
|
|
if (!host->use_dma)
|
|
return;
|
|
|
|
mmci_dma_unmap(host, data);
|
|
|
|
if (err) {
|
|
struct mmci_dmae_next *next = &dmae->next_data;
|
|
struct dma_chan *chan;
|
|
if (data->flags & MMC_DATA_READ)
|
|
chan = dmae->rx_channel;
|
|
else
|
|
chan = dmae->tx_channel;
|
|
dmaengine_terminate_all(chan);
|
|
|
|
if (dmae->desc_current == next->desc)
|
|
dmae->desc_current = NULL;
|
|
|
|
if (dmae->cur == next->chan) {
|
|
host->dma_in_progress = false;
|
|
dmae->cur = NULL;
|
|
}
|
|
|
|
next->desc = NULL;
|
|
next->chan = NULL;
|
|
}
|
|
}
|
|
|
|
static struct mmci_host_ops mmci_variant_ops = {
|
|
.prep_data = mmci_dmae_prep_data,
|
|
.unprep_data = mmci_dmae_unprep_data,
|
|
.get_datactrl_cfg = mmci_get_dctrl_cfg,
|
|
.get_next_data = mmci_dmae_get_next_data,
|
|
.dma_setup = mmci_dmae_setup,
|
|
.dma_release = mmci_dmae_release,
|
|
.dma_start = mmci_dmae_start,
|
|
.dma_finalize = mmci_dmae_finalize,
|
|
.dma_error = mmci_dmae_error,
|
|
};
|
|
#else
|
|
static struct mmci_host_ops mmci_variant_ops = {
|
|
.get_datactrl_cfg = mmci_get_dctrl_cfg,
|
|
};
|
|
#endif
|
|
|
|
static void mmci_variant_init(struct mmci_host *host)
|
|
{
|
|
host->ops = &mmci_variant_ops;
|
|
}
|
|
|
|
static void ux500_variant_init(struct mmci_host *host)
|
|
{
|
|
host->ops = &mmci_variant_ops;
|
|
host->ops->busy_complete = ux500_busy_complete;
|
|
}
|
|
|
|
static void ux500v2_variant_init(struct mmci_host *host)
|
|
{
|
|
host->ops = &mmci_variant_ops;
|
|
host->ops->busy_complete = ux500_busy_complete;
|
|
host->ops->get_datactrl_cfg = ux500v2_get_dctrl_cfg;
|
|
}
|
|
|
|
static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!data)
|
|
return;
|
|
|
|
WARN_ON(data->host_cookie);
|
|
|
|
if (mmci_validate_data(host, data))
|
|
return;
|
|
|
|
mmci_prep_data(host, data, true);
|
|
}
|
|
|
|
static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
|
|
int err)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
struct mmc_data *data = mrq->data;
|
|
|
|
if (!data || !data->host_cookie)
|
|
return;
|
|
|
|
mmci_unprep_data(host, data, err);
|
|
}
|
|
|
|
static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
|
|
{
|
|
struct variant_data *variant = host->variant;
|
|
unsigned int datactrl, timeout, irqmask;
|
|
unsigned long long clks;
|
|
void __iomem *base;
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
|
|
data->blksz, data->blocks, data->flags);
|
|
|
|
host->data = data;
|
|
host->size = data->blksz * data->blocks;
|
|
data->bytes_xfered = 0;
|
|
|
|
clks = (unsigned long long)data->timeout_ns * host->cclk;
|
|
do_div(clks, NSEC_PER_SEC);
|
|
|
|
timeout = data->timeout_clks + (unsigned int)clks;
|
|
|
|
base = host->base;
|
|
writel(timeout, base + MMCIDATATIMER);
|
|
writel(host->size, base + MMCIDATALENGTH);
|
|
|
|
datactrl = host->ops->get_datactrl_cfg(host);
|
|
datactrl |= host->data->flags & MMC_DATA_READ ? MCI_DPSM_DIRECTION : 0;
|
|
|
|
if (host->mmc->card && mmc_card_sdio(host->mmc->card)) {
|
|
u32 clk;
|
|
|
|
datactrl |= variant->datactrl_mask_sdio;
|
|
|
|
/*
|
|
* The ST Micro variant for SDIO small write transfers
|
|
* needs to have clock H/W flow control disabled,
|
|
* otherwise the transfer will not start. The threshold
|
|
* depends on the rate of MCLK.
|
|
*/
|
|
if (variant->st_sdio && data->flags & MMC_DATA_WRITE &&
|
|
(host->size < 8 ||
|
|
(host->size <= 8 && host->mclk > 50000000)))
|
|
clk = host->clk_reg & ~variant->clkreg_enable;
|
|
else
|
|
clk = host->clk_reg | variant->clkreg_enable;
|
|
|
|
mmci_write_clkreg(host, clk);
|
|
}
|
|
|
|
if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
|
|
host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
|
|
datactrl |= variant->datactrl_mask_ddrmode;
|
|
|
|
/*
|
|
* Attempt to use DMA operation mode, if this
|
|
* should fail, fall back to PIO mode
|
|
*/
|
|
if (!mmci_dma_start(host, datactrl))
|
|
return;
|
|
|
|
/* IRQ mode, map the SG list for CPU reading/writing */
|
|
mmci_init_sg(host, data);
|
|
|
|
if (data->flags & MMC_DATA_READ) {
|
|
irqmask = MCI_RXFIFOHALFFULLMASK;
|
|
|
|
/*
|
|
* If we have less than the fifo 'half-full' threshold to
|
|
* transfer, trigger a PIO interrupt as soon as any data
|
|
* is available.
|
|
*/
|
|
if (host->size < variant->fifohalfsize)
|
|
irqmask |= MCI_RXDATAAVLBLMASK;
|
|
} else {
|
|
/*
|
|
* We don't actually need to include "FIFO empty" here
|
|
* since its implicit in "FIFO half empty".
|
|
*/
|
|
irqmask = MCI_TXFIFOHALFEMPTYMASK;
|
|
}
|
|
|
|
mmci_write_datactrlreg(host, datactrl);
|
|
writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
|
|
mmci_set_mask1(host, irqmask);
|
|
}
|
|
|
|
static void
|
|
mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
|
|
{
|
|
void __iomem *base = host->base;
|
|
unsigned long long clks;
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
|
|
cmd->opcode, cmd->arg, cmd->flags);
|
|
|
|
if (readl(base + MMCICOMMAND) & host->variant->cmdreg_cpsm_enable) {
|
|
writel(0, base + MMCICOMMAND);
|
|
mmci_reg_delay(host);
|
|
}
|
|
|
|
if (host->variant->cmdreg_stop &&
|
|
cmd->opcode == MMC_STOP_TRANSMISSION)
|
|
c |= host->variant->cmdreg_stop;
|
|
|
|
c |= cmd->opcode | host->variant->cmdreg_cpsm_enable;
|
|
if (cmd->flags & MMC_RSP_PRESENT) {
|
|
if (cmd->flags & MMC_RSP_136)
|
|
c |= host->variant->cmdreg_lrsp_crc;
|
|
else if (cmd->flags & MMC_RSP_CRC)
|
|
c |= host->variant->cmdreg_srsp_crc;
|
|
else
|
|
c |= host->variant->cmdreg_srsp;
|
|
}
|
|
|
|
if (host->variant->busy_timeout && cmd->flags & MMC_RSP_BUSY) {
|
|
if (!cmd->busy_timeout)
|
|
cmd->busy_timeout = 10 * MSEC_PER_SEC;
|
|
|
|
clks = (unsigned long long)cmd->busy_timeout * host->cclk;
|
|
do_div(clks, MSEC_PER_SEC);
|
|
writel_relaxed(clks, host->base + MMCIDATATIMER);
|
|
}
|
|
|
|
if (/*interrupt*/0)
|
|
c |= MCI_CPSM_INTERRUPT;
|
|
|
|
if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
|
|
c |= host->variant->data_cmd_enable;
|
|
|
|
host->cmd = cmd;
|
|
|
|
writel(cmd->arg, base + MMCIARGUMENT);
|
|
writel(c, base + MMCICOMMAND);
|
|
}
|
|
|
|
static void mmci_stop_command(struct mmci_host *host)
|
|
{
|
|
host->stop_abort.error = 0;
|
|
mmci_start_command(host, &host->stop_abort, 0);
|
|
}
|
|
|
|
static void
|
|
mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
|
|
unsigned int status)
|
|
{
|
|
unsigned int status_err;
|
|
|
|
/* Make sure we have data to handle */
|
|
if (!data)
|
|
return;
|
|
|
|
/* First check for errors */
|
|
status_err = status & (host->variant->start_err |
|
|
MCI_DATACRCFAIL | MCI_DATATIMEOUT |
|
|
MCI_TXUNDERRUN | MCI_RXOVERRUN);
|
|
|
|
if (status_err) {
|
|
u32 remain, success;
|
|
|
|
/* Terminate the DMA transfer */
|
|
mmci_dma_error(host);
|
|
|
|
/*
|
|
* Calculate how far we are into the transfer. Note that
|
|
* the data counter gives the number of bytes transferred
|
|
* on the MMC bus, not on the host side. On reads, this
|
|
* can be as much as a FIFO-worth of data ahead. This
|
|
* matters for FIFO overruns only.
|
|
*/
|
|
if (!host->variant->datacnt_useless) {
|
|
remain = readl(host->base + MMCIDATACNT);
|
|
success = data->blksz * data->blocks - remain;
|
|
} else {
|
|
success = 0;
|
|
}
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
|
|
status_err, success);
|
|
if (status_err & MCI_DATACRCFAIL) {
|
|
/* Last block was not successful */
|
|
success -= 1;
|
|
data->error = -EILSEQ;
|
|
} else if (status_err & MCI_DATATIMEOUT) {
|
|
data->error = -ETIMEDOUT;
|
|
} else if (status_err & MCI_STARTBITERR) {
|
|
data->error = -ECOMM;
|
|
} else if (status_err & MCI_TXUNDERRUN) {
|
|
data->error = -EIO;
|
|
} else if (status_err & MCI_RXOVERRUN) {
|
|
if (success > host->variant->fifosize)
|
|
success -= host->variant->fifosize;
|
|
else
|
|
success = 0;
|
|
data->error = -EIO;
|
|
}
|
|
data->bytes_xfered = round_down(success, data->blksz);
|
|
}
|
|
|
|
if (status & MCI_DATABLOCKEND)
|
|
dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
|
|
|
|
if (status & MCI_DATAEND || data->error) {
|
|
mmci_dma_finalize(host, data);
|
|
|
|
mmci_stop_data(host);
|
|
|
|
if (!data->error)
|
|
/* The error clause is handled above, success! */
|
|
data->bytes_xfered = data->blksz * data->blocks;
|
|
|
|
if (!data->stop) {
|
|
if (host->variant->cmdreg_stop && data->error)
|
|
mmci_stop_command(host);
|
|
else
|
|
mmci_request_end(host, data->mrq);
|
|
} else if (host->mrq->sbc && !data->error) {
|
|
mmci_request_end(host, data->mrq);
|
|
} else {
|
|
mmci_start_command(host, data->stop, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
|
|
unsigned int status)
|
|
{
|
|
u32 err_msk = MCI_CMDCRCFAIL | MCI_CMDTIMEOUT;
|
|
void __iomem *base = host->base;
|
|
bool sbc, busy_resp;
|
|
|
|
if (!cmd)
|
|
return;
|
|
|
|
sbc = (cmd == host->mrq->sbc);
|
|
busy_resp = !!(cmd->flags & MMC_RSP_BUSY);
|
|
|
|
/*
|
|
* We need to be one of these interrupts to be considered worth
|
|
* handling. Note that we tag on any latent IRQs postponed
|
|
* due to waiting for busy status.
|
|
*/
|
|
if (host->variant->busy_timeout && busy_resp)
|
|
err_msk |= MCI_DATATIMEOUT;
|
|
|
|
if (!((status | host->busy_status) &
|
|
(err_msk | MCI_CMDSENT | MCI_CMDRESPEND)))
|
|
return;
|
|
|
|
/* Handle busy detection on DAT0 if the variant supports it. */
|
|
if (busy_resp && host->variant->busy_detect)
|
|
if (!host->ops->busy_complete(host, status, err_msk))
|
|
return;
|
|
|
|
host->cmd = NULL;
|
|
|
|
if (status & MCI_CMDTIMEOUT) {
|
|
cmd->error = -ETIMEDOUT;
|
|
} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
|
|
cmd->error = -EILSEQ;
|
|
} else if (host->variant->busy_timeout && busy_resp &&
|
|
status & MCI_DATATIMEOUT) {
|
|
cmd->error = -ETIMEDOUT;
|
|
host->irq_action = IRQ_WAKE_THREAD;
|
|
} else {
|
|
cmd->resp[0] = readl(base + MMCIRESPONSE0);
|
|
cmd->resp[1] = readl(base + MMCIRESPONSE1);
|
|
cmd->resp[2] = readl(base + MMCIRESPONSE2);
|
|
cmd->resp[3] = readl(base + MMCIRESPONSE3);
|
|
}
|
|
|
|
if ((!sbc && !cmd->data) || cmd->error) {
|
|
if (host->data) {
|
|
/* Terminate the DMA transfer */
|
|
mmci_dma_error(host);
|
|
|
|
mmci_stop_data(host);
|
|
if (host->variant->cmdreg_stop && cmd->error) {
|
|
mmci_stop_command(host);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (host->irq_action != IRQ_WAKE_THREAD)
|
|
mmci_request_end(host, host->mrq);
|
|
|
|
} else if (sbc) {
|
|
mmci_start_command(host, host->mrq->cmd, 0);
|
|
} else if (!host->variant->datactrl_first &&
|
|
!(cmd->data->flags & MMC_DATA_READ)) {
|
|
mmci_start_data(host, cmd->data);
|
|
}
|
|
}
|
|
|
|
static int mmci_get_rx_fifocnt(struct mmci_host *host, u32 status, int remain)
|
|
{
|
|
return remain - (readl(host->base + MMCIFIFOCNT) << 2);
|
|
}
|
|
|
|
static int mmci_qcom_get_rx_fifocnt(struct mmci_host *host, u32 status, int r)
|
|
{
|
|
/*
|
|
* on qcom SDCC4 only 8 words are used in each burst so only 8 addresses
|
|
* from the fifo range should be used
|
|
*/
|
|
if (status & MCI_RXFIFOHALFFULL)
|
|
return host->variant->fifohalfsize;
|
|
else if (status & MCI_RXDATAAVLBL)
|
|
return 4;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
|
|
{
|
|
void __iomem *base = host->base;
|
|
char *ptr = buffer;
|
|
u32 status = readl(host->base + MMCISTATUS);
|
|
int host_remain = host->size;
|
|
|
|
do {
|
|
int count = host->get_rx_fifocnt(host, status, host_remain);
|
|
|
|
if (count > remain)
|
|
count = remain;
|
|
|
|
if (count <= 0)
|
|
break;
|
|
|
|
/*
|
|
* SDIO especially may want to send something that is
|
|
* not divisible by 4 (as opposed to card sectors
|
|
* etc). Therefore make sure to always read the last bytes
|
|
* while only doing full 32-bit reads towards the FIFO.
|
|
*/
|
|
if (unlikely(count & 0x3)) {
|
|
if (count < 4) {
|
|
unsigned char buf[4];
|
|
ioread32_rep(base + MMCIFIFO, buf, 1);
|
|
memcpy(ptr, buf, count);
|
|
} else {
|
|
ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
|
|
count &= ~0x3;
|
|
}
|
|
} else {
|
|
ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
|
|
}
|
|
|
|
ptr += count;
|
|
remain -= count;
|
|
host_remain -= count;
|
|
|
|
if (remain == 0)
|
|
break;
|
|
|
|
status = readl(base + MMCISTATUS);
|
|
} while (status & MCI_RXDATAAVLBL);
|
|
|
|
return ptr - buffer;
|
|
}
|
|
|
|
static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
|
|
{
|
|
struct variant_data *variant = host->variant;
|
|
void __iomem *base = host->base;
|
|
char *ptr = buffer;
|
|
|
|
do {
|
|
unsigned int count, maxcnt;
|
|
|
|
maxcnt = status & MCI_TXFIFOEMPTY ?
|
|
variant->fifosize : variant->fifohalfsize;
|
|
count = min(remain, maxcnt);
|
|
|
|
/*
|
|
* SDIO especially may want to send something that is
|
|
* not divisible by 4 (as opposed to card sectors
|
|
* etc), and the FIFO only accept full 32-bit writes.
|
|
* So compensate by adding +3 on the count, a single
|
|
* byte become a 32bit write, 7 bytes will be two
|
|
* 32bit writes etc.
|
|
*/
|
|
iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
|
|
|
|
ptr += count;
|
|
remain -= count;
|
|
|
|
if (remain == 0)
|
|
break;
|
|
|
|
status = readl(base + MMCISTATUS);
|
|
} while (status & MCI_TXFIFOHALFEMPTY);
|
|
|
|
return ptr - buffer;
|
|
}
|
|
|
|
/*
|
|
* PIO data transfer IRQ handler.
|
|
*/
|
|
static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
|
|
{
|
|
struct mmci_host *host = dev_id;
|
|
struct sg_mapping_iter *sg_miter = &host->sg_miter;
|
|
struct variant_data *variant = host->variant;
|
|
void __iomem *base = host->base;
|
|
u32 status;
|
|
|
|
status = readl(base + MMCISTATUS);
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
|
|
|
|
do {
|
|
unsigned int remain, len;
|
|
char *buffer;
|
|
|
|
/*
|
|
* For write, we only need to test the half-empty flag
|
|
* here - if the FIFO is completely empty, then by
|
|
* definition it is more than half empty.
|
|
*
|
|
* For read, check for data available.
|
|
*/
|
|
if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
|
|
break;
|
|
|
|
if (!sg_miter_next(sg_miter))
|
|
break;
|
|
|
|
buffer = sg_miter->addr;
|
|
remain = sg_miter->length;
|
|
|
|
len = 0;
|
|
if (status & MCI_RXACTIVE)
|
|
len = mmci_pio_read(host, buffer, remain);
|
|
if (status & MCI_TXACTIVE)
|
|
len = mmci_pio_write(host, buffer, remain, status);
|
|
|
|
sg_miter->consumed = len;
|
|
|
|
host->size -= len;
|
|
remain -= len;
|
|
|
|
if (remain)
|
|
break;
|
|
|
|
status = readl(base + MMCISTATUS);
|
|
} while (1);
|
|
|
|
sg_miter_stop(sg_miter);
|
|
|
|
/*
|
|
* If we have less than the fifo 'half-full' threshold to transfer,
|
|
* trigger a PIO interrupt as soon as any data is available.
|
|
*/
|
|
if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
|
|
mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
|
|
|
|
/*
|
|
* If we run out of data, disable the data IRQs; this
|
|
* prevents a race where the FIFO becomes empty before
|
|
* the chip itself has disabled the data path, and
|
|
* stops us racing with our data end IRQ.
|
|
*/
|
|
if (host->size == 0) {
|
|
mmci_set_mask1(host, 0);
|
|
writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Handle completion of command and data transfers.
|
|
*/
|
|
static irqreturn_t mmci_irq(int irq, void *dev_id)
|
|
{
|
|
struct mmci_host *host = dev_id;
|
|
u32 status;
|
|
|
|
spin_lock(&host->lock);
|
|
host->irq_action = IRQ_HANDLED;
|
|
|
|
do {
|
|
status = readl(host->base + MMCISTATUS);
|
|
|
|
if (host->singleirq) {
|
|
if (status & host->mask1_reg)
|
|
mmci_pio_irq(irq, dev_id);
|
|
|
|
status &= ~host->variant->irq_pio_mask;
|
|
}
|
|
|
|
/*
|
|
* Busy detection is managed by mmci_cmd_irq(), including to
|
|
* clear the corresponding IRQ.
|
|
*/
|
|
status &= readl(host->base + MMCIMASK0);
|
|
if (host->variant->busy_detect)
|
|
writel(status & ~host->variant->busy_detect_mask,
|
|
host->base + MMCICLEAR);
|
|
else
|
|
writel(status, host->base + MMCICLEAR);
|
|
|
|
dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
|
|
|
|
if (host->variant->reversed_irq_handling) {
|
|
mmci_data_irq(host, host->data, status);
|
|
mmci_cmd_irq(host, host->cmd, status);
|
|
} else {
|
|
mmci_cmd_irq(host, host->cmd, status);
|
|
mmci_data_irq(host, host->data, status);
|
|
}
|
|
|
|
/*
|
|
* Busy detection has been handled by mmci_cmd_irq() above.
|
|
* Clear the status bit to prevent polling in IRQ context.
|
|
*/
|
|
if (host->variant->busy_detect_flag)
|
|
status &= ~host->variant->busy_detect_flag;
|
|
|
|
} while (status);
|
|
|
|
spin_unlock(&host->lock);
|
|
|
|
return host->irq_action;
|
|
}
|
|
|
|
/*
|
|
* mmci_irq_thread() - A threaded IRQ handler that manages a reset of the HW.
|
|
*
|
|
* A reset is needed for some variants, where a datatimeout for a R1B request
|
|
* causes the DPSM to stay busy (non-functional).
|
|
*/
|
|
static irqreturn_t mmci_irq_thread(int irq, void *dev_id)
|
|
{
|
|
struct mmci_host *host = dev_id;
|
|
unsigned long flags;
|
|
|
|
if (host->rst) {
|
|
reset_control_assert(host->rst);
|
|
udelay(2);
|
|
reset_control_deassert(host->rst);
|
|
}
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
writel(host->clk_reg, host->base + MMCICLOCK);
|
|
writel(host->pwr_reg, host->base + MMCIPOWER);
|
|
writel(MCI_IRQENABLE | host->variant->start_err,
|
|
host->base + MMCIMASK0);
|
|
|
|
host->irq_action = IRQ_HANDLED;
|
|
mmci_request_end(host, host->mrq);
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
|
|
return host->irq_action;
|
|
}
|
|
|
|
static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
unsigned long flags;
|
|
|
|
WARN_ON(host->mrq != NULL);
|
|
|
|
mrq->cmd->error = mmci_validate_data(host, mrq->data);
|
|
if (mrq->cmd->error) {
|
|
mmc_request_done(mmc, mrq);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
host->mrq = mrq;
|
|
|
|
if (mrq->data)
|
|
mmci_get_next_data(host, mrq->data);
|
|
|
|
if (mrq->data &&
|
|
(host->variant->datactrl_first || mrq->data->flags & MMC_DATA_READ))
|
|
mmci_start_data(host, mrq->data);
|
|
|
|
if (mrq->sbc)
|
|
mmci_start_command(host, mrq->sbc, 0);
|
|
else
|
|
mmci_start_command(host, mrq->cmd, 0);
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void mmci_set_max_busy_timeout(struct mmc_host *mmc)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
u32 max_busy_timeout = 0;
|
|
|
|
if (!host->variant->busy_detect)
|
|
return;
|
|
|
|
if (host->variant->busy_timeout && mmc->actual_clock)
|
|
max_busy_timeout = ~0UL / (mmc->actual_clock / MSEC_PER_SEC);
|
|
|
|
mmc->max_busy_timeout = max_busy_timeout;
|
|
}
|
|
|
|
static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
struct variant_data *variant = host->variant;
|
|
u32 pwr = 0;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (host->plat->ios_handler &&
|
|
host->plat->ios_handler(mmc_dev(mmc), ios))
|
|
dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
|
|
|
|
switch (ios->power_mode) {
|
|
case MMC_POWER_OFF:
|
|
if (!IS_ERR(mmc->supply.vmmc))
|
|
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
|
|
|
|
if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
|
|
regulator_disable(mmc->supply.vqmmc);
|
|
host->vqmmc_enabled = false;
|
|
}
|
|
|
|
break;
|
|
case MMC_POWER_UP:
|
|
if (!IS_ERR(mmc->supply.vmmc))
|
|
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
|
|
|
|
/*
|
|
* The ST Micro variant doesn't have the PL180s MCI_PWR_UP
|
|
* and instead uses MCI_PWR_ON so apply whatever value is
|
|
* configured in the variant data.
|
|
*/
|
|
pwr |= variant->pwrreg_powerup;
|
|
|
|
break;
|
|
case MMC_POWER_ON:
|
|
if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
|
|
ret = regulator_enable(mmc->supply.vqmmc);
|
|
if (ret < 0)
|
|
dev_err(mmc_dev(mmc),
|
|
"failed to enable vqmmc regulator\n");
|
|
else
|
|
host->vqmmc_enabled = true;
|
|
}
|
|
|
|
pwr |= MCI_PWR_ON;
|
|
break;
|
|
}
|
|
|
|
if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
|
|
/*
|
|
* The ST Micro variant has some additional bits
|
|
* indicating signal direction for the signals in
|
|
* the SD/MMC bus and feedback-clock usage.
|
|
*/
|
|
pwr |= host->pwr_reg_add;
|
|
|
|
if (ios->bus_width == MMC_BUS_WIDTH_4)
|
|
pwr &= ~MCI_ST_DATA74DIREN;
|
|
else if (ios->bus_width == MMC_BUS_WIDTH_1)
|
|
pwr &= (~MCI_ST_DATA74DIREN &
|
|
~MCI_ST_DATA31DIREN &
|
|
~MCI_ST_DATA2DIREN);
|
|
}
|
|
|
|
if (variant->opendrain) {
|
|
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
|
|
pwr |= variant->opendrain;
|
|
} else {
|
|
/*
|
|
* If the variant cannot configure the pads by its own, then we
|
|
* expect the pinctrl to be able to do that for us
|
|
*/
|
|
if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
|
|
pinctrl_select_state(host->pinctrl, host->pins_opendrain);
|
|
else
|
|
pinctrl_select_default_state(mmc_dev(mmc));
|
|
}
|
|
|
|
/*
|
|
* If clock = 0 and the variant requires the MMCIPOWER to be used for
|
|
* gating the clock, the MCI_PWR_ON bit is cleared.
|
|
*/
|
|
if (!ios->clock && variant->pwrreg_clkgate)
|
|
pwr &= ~MCI_PWR_ON;
|
|
|
|
if (host->variant->explicit_mclk_control &&
|
|
ios->clock != host->clock_cache) {
|
|
ret = clk_set_rate(host->clk, ios->clock);
|
|
if (ret < 0)
|
|
dev_err(mmc_dev(host->mmc),
|
|
"Error setting clock rate (%d)\n", ret);
|
|
else
|
|
host->mclk = clk_get_rate(host->clk);
|
|
}
|
|
host->clock_cache = ios->clock;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
if (host->ops && host->ops->set_clkreg)
|
|
host->ops->set_clkreg(host, ios->clock);
|
|
else
|
|
mmci_set_clkreg(host, ios->clock);
|
|
|
|
mmci_set_max_busy_timeout(mmc);
|
|
|
|
if (host->ops && host->ops->set_pwrreg)
|
|
host->ops->set_pwrreg(host, pwr);
|
|
else
|
|
mmci_write_pwrreg(host, pwr);
|
|
|
|
mmci_reg_delay(host);
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static int mmci_get_cd(struct mmc_host *mmc)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
struct mmci_platform_data *plat = host->plat;
|
|
unsigned int status = mmc_gpio_get_cd(mmc);
|
|
|
|
if (status == -ENOSYS) {
|
|
if (!plat->status)
|
|
return 1; /* Assume always present */
|
|
|
|
status = plat->status(mmc_dev(host->mmc));
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!IS_ERR(mmc->supply.vqmmc)) {
|
|
|
|
switch (ios->signal_voltage) {
|
|
case MMC_SIGNAL_VOLTAGE_330:
|
|
ret = regulator_set_voltage(mmc->supply.vqmmc,
|
|
2700000, 3600000);
|
|
break;
|
|
case MMC_SIGNAL_VOLTAGE_180:
|
|
ret = regulator_set_voltage(mmc->supply.vqmmc,
|
|
1700000, 1950000);
|
|
break;
|
|
case MMC_SIGNAL_VOLTAGE_120:
|
|
ret = regulator_set_voltage(mmc->supply.vqmmc,
|
|
1100000, 1300000);
|
|
break;
|
|
}
|
|
|
|
if (ret)
|
|
dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct mmc_host_ops mmci_ops = {
|
|
.request = mmci_request,
|
|
.pre_req = mmci_pre_request,
|
|
.post_req = mmci_post_request,
|
|
.set_ios = mmci_set_ios,
|
|
.get_ro = mmc_gpio_get_ro,
|
|
.get_cd = mmci_get_cd,
|
|
.start_signal_voltage_switch = mmci_sig_volt_switch,
|
|
};
|
|
|
|
static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
|
|
{
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
int ret = mmc_of_parse(mmc);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (of_get_property(np, "st,sig-dir-dat0", NULL))
|
|
host->pwr_reg_add |= MCI_ST_DATA0DIREN;
|
|
if (of_get_property(np, "st,sig-dir-dat2", NULL))
|
|
host->pwr_reg_add |= MCI_ST_DATA2DIREN;
|
|
if (of_get_property(np, "st,sig-dir-dat31", NULL))
|
|
host->pwr_reg_add |= MCI_ST_DATA31DIREN;
|
|
if (of_get_property(np, "st,sig-dir-dat74", NULL))
|
|
host->pwr_reg_add |= MCI_ST_DATA74DIREN;
|
|
if (of_get_property(np, "st,sig-dir-cmd", NULL))
|
|
host->pwr_reg_add |= MCI_ST_CMDDIREN;
|
|
if (of_get_property(np, "st,sig-pin-fbclk", NULL))
|
|
host->pwr_reg_add |= MCI_ST_FBCLKEN;
|
|
if (of_get_property(np, "st,sig-dir", NULL))
|
|
host->pwr_reg_add |= MCI_STM32_DIRPOL;
|
|
if (of_get_property(np, "st,neg-edge", NULL))
|
|
host->clk_reg_add |= MCI_STM32_CLK_NEGEDGE;
|
|
if (of_get_property(np, "st,use-ckin", NULL))
|
|
host->clk_reg_add |= MCI_STM32_CLK_SELCKIN;
|
|
|
|
if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
|
|
mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
|
|
if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
|
|
mmc->caps |= MMC_CAP_SD_HIGHSPEED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmci_probe(struct amba_device *dev,
|
|
const struct amba_id *id)
|
|
{
|
|
struct mmci_platform_data *plat = dev->dev.platform_data;
|
|
struct device_node *np = dev->dev.of_node;
|
|
struct variant_data *variant = id->data;
|
|
struct mmci_host *host;
|
|
struct mmc_host *mmc;
|
|
int ret;
|
|
|
|
/* Must have platform data or Device Tree. */
|
|
if (!plat && !np) {
|
|
dev_err(&dev->dev, "No plat data or DT found\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!plat) {
|
|
plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
|
|
if (!plat)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
|
|
if (!mmc)
|
|
return -ENOMEM;
|
|
|
|
ret = mmci_of_parse(np, mmc);
|
|
if (ret)
|
|
goto host_free;
|
|
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
host->mmc_ops = &mmci_ops;
|
|
mmc->ops = &mmci_ops;
|
|
|
|
/*
|
|
* Some variant (STM32) doesn't have opendrain bit, nevertheless
|
|
* pins can be set accordingly using pinctrl
|
|
*/
|
|
if (!variant->opendrain) {
|
|
host->pinctrl = devm_pinctrl_get(&dev->dev);
|
|
if (IS_ERR(host->pinctrl)) {
|
|
dev_err(&dev->dev, "failed to get pinctrl");
|
|
ret = PTR_ERR(host->pinctrl);
|
|
goto host_free;
|
|
}
|
|
|
|
host->pins_opendrain = pinctrl_lookup_state(host->pinctrl,
|
|
MMCI_PINCTRL_STATE_OPENDRAIN);
|
|
if (IS_ERR(host->pins_opendrain)) {
|
|
dev_err(mmc_dev(mmc), "Can't select opendrain pins\n");
|
|
ret = PTR_ERR(host->pins_opendrain);
|
|
goto host_free;
|
|
}
|
|
}
|
|
|
|
host->hw_designer = amba_manf(dev);
|
|
host->hw_revision = amba_rev(dev);
|
|
dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
|
|
dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
|
|
|
|
host->clk = devm_clk_get(&dev->dev, NULL);
|
|
if (IS_ERR(host->clk)) {
|
|
ret = PTR_ERR(host->clk);
|
|
goto host_free;
|
|
}
|
|
|
|
ret = clk_prepare_enable(host->clk);
|
|
if (ret)
|
|
goto host_free;
|
|
|
|
if (variant->qcom_fifo)
|
|
host->get_rx_fifocnt = mmci_qcom_get_rx_fifocnt;
|
|
else
|
|
host->get_rx_fifocnt = mmci_get_rx_fifocnt;
|
|
|
|
host->plat = plat;
|
|
host->variant = variant;
|
|
host->mclk = clk_get_rate(host->clk);
|
|
/*
|
|
* According to the spec, mclk is max 100 MHz,
|
|
* so we try to adjust the clock down to this,
|
|
* (if possible).
|
|
*/
|
|
if (host->mclk > variant->f_max) {
|
|
ret = clk_set_rate(host->clk, variant->f_max);
|
|
if (ret < 0)
|
|
goto clk_disable;
|
|
host->mclk = clk_get_rate(host->clk);
|
|
dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
|
|
host->mclk);
|
|
}
|
|
|
|
host->phybase = dev->res.start;
|
|
host->base = devm_ioremap_resource(&dev->dev, &dev->res);
|
|
if (IS_ERR(host->base)) {
|
|
ret = PTR_ERR(host->base);
|
|
goto clk_disable;
|
|
}
|
|
|
|
if (variant->init)
|
|
variant->init(host);
|
|
|
|
/*
|
|
* The ARM and ST versions of the block have slightly different
|
|
* clock divider equations which means that the minimum divider
|
|
* differs too.
|
|
* on Qualcomm like controllers get the nearest minimum clock to 100Khz
|
|
*/
|
|
if (variant->st_clkdiv)
|
|
mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
|
|
else if (variant->stm32_clkdiv)
|
|
mmc->f_min = DIV_ROUND_UP(host->mclk, 2046);
|
|
else if (variant->explicit_mclk_control)
|
|
mmc->f_min = clk_round_rate(host->clk, 100000);
|
|
else
|
|
mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
|
|
/*
|
|
* If no maximum operating frequency is supplied, fall back to use
|
|
* the module parameter, which has a (low) default value in case it
|
|
* is not specified. Either value must not exceed the clock rate into
|
|
* the block, of course.
|
|
*/
|
|
if (mmc->f_max)
|
|
mmc->f_max = variant->explicit_mclk_control ?
|
|
min(variant->f_max, mmc->f_max) :
|
|
min(host->mclk, mmc->f_max);
|
|
else
|
|
mmc->f_max = variant->explicit_mclk_control ?
|
|
fmax : min(host->mclk, fmax);
|
|
|
|
|
|
dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
|
|
|
|
host->rst = devm_reset_control_get_optional_exclusive(&dev->dev, NULL);
|
|
if (IS_ERR(host->rst)) {
|
|
ret = PTR_ERR(host->rst);
|
|
goto clk_disable;
|
|
}
|
|
|
|
/* Get regulators and the supported OCR mask */
|
|
ret = mmc_regulator_get_supply(mmc);
|
|
if (ret)
|
|
goto clk_disable;
|
|
|
|
if (!mmc->ocr_avail)
|
|
mmc->ocr_avail = plat->ocr_mask;
|
|
else if (plat->ocr_mask)
|
|
dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
|
|
|
|
/* We support these capabilities. */
|
|
mmc->caps |= MMC_CAP_CMD23;
|
|
|
|
/*
|
|
* Enable busy detection.
|
|
*/
|
|
if (variant->busy_detect) {
|
|
mmci_ops.card_busy = mmci_card_busy;
|
|
/*
|
|
* Not all variants have a flag to enable busy detection
|
|
* in the DPSM, but if they do, set it here.
|
|
*/
|
|
if (variant->busy_dpsm_flag)
|
|
mmci_write_datactrlreg(host,
|
|
host->variant->busy_dpsm_flag);
|
|
mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
|
|
}
|
|
|
|
/* Prepare a CMD12 - needed to clear the DPSM on some variants. */
|
|
host->stop_abort.opcode = MMC_STOP_TRANSMISSION;
|
|
host->stop_abort.arg = 0;
|
|
host->stop_abort.flags = MMC_RSP_R1B | MMC_CMD_AC;
|
|
|
|
/* We support these PM capabilities. */
|
|
mmc->pm_caps |= MMC_PM_KEEP_POWER;
|
|
|
|
/*
|
|
* We can do SGIO
|
|
*/
|
|
mmc->max_segs = NR_SG;
|
|
|
|
/*
|
|
* Since only a certain number of bits are valid in the data length
|
|
* register, we must ensure that we don't exceed 2^num-1 bytes in a
|
|
* single request.
|
|
*/
|
|
mmc->max_req_size = (1 << variant->datalength_bits) - 1;
|
|
|
|
/*
|
|
* Set the maximum segment size. Since we aren't doing DMA
|
|
* (yet) we are only limited by the data length register.
|
|
*/
|
|
mmc->max_seg_size = mmc->max_req_size;
|
|
|
|
/*
|
|
* Block size can be up to 2048 bytes, but must be a power of two.
|
|
*/
|
|
mmc->max_blk_size = 1 << variant->datactrl_blocksz;
|
|
|
|
/*
|
|
* Limit the number of blocks transferred so that we don't overflow
|
|
* the maximum request size.
|
|
*/
|
|
mmc->max_blk_count = mmc->max_req_size >> variant->datactrl_blocksz;
|
|
|
|
spin_lock_init(&host->lock);
|
|
|
|
writel(0, host->base + MMCIMASK0);
|
|
|
|
if (variant->mmcimask1)
|
|
writel(0, host->base + MMCIMASK1);
|
|
|
|
writel(0xfff, host->base + MMCICLEAR);
|
|
|
|
/*
|
|
* If:
|
|
* - not using DT but using a descriptor table, or
|
|
* - using a table of descriptors ALONGSIDE DT, or
|
|
* look up these descriptors named "cd" and "wp" right here, fail
|
|
* silently of these do not exist
|
|
*/
|
|
if (!np) {
|
|
ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0);
|
|
if (ret == -EPROBE_DEFER)
|
|
goto clk_disable;
|
|
|
|
ret = mmc_gpiod_request_ro(mmc, "wp", 0, 0);
|
|
if (ret == -EPROBE_DEFER)
|
|
goto clk_disable;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(&dev->dev, dev->irq[0], mmci_irq,
|
|
mmci_irq_thread, IRQF_SHARED,
|
|
DRIVER_NAME " (cmd)", host);
|
|
if (ret)
|
|
goto clk_disable;
|
|
|
|
if (!dev->irq[1])
|
|
host->singleirq = true;
|
|
else {
|
|
ret = devm_request_irq(&dev->dev, dev->irq[1], mmci_pio_irq,
|
|
IRQF_SHARED, DRIVER_NAME " (pio)", host);
|
|
if (ret)
|
|
goto clk_disable;
|
|
}
|
|
|
|
writel(MCI_IRQENABLE | variant->start_err, host->base + MMCIMASK0);
|
|
|
|
amba_set_drvdata(dev, mmc);
|
|
|
|
dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
|
|
mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
|
|
amba_rev(dev), (unsigned long long)dev->res.start,
|
|
dev->irq[0], dev->irq[1]);
|
|
|
|
mmci_dma_setup(host);
|
|
|
|
pm_runtime_set_autosuspend_delay(&dev->dev, 50);
|
|
pm_runtime_use_autosuspend(&dev->dev);
|
|
|
|
mmc_add_host(mmc);
|
|
|
|
pm_runtime_put(&dev->dev);
|
|
return 0;
|
|
|
|
clk_disable:
|
|
clk_disable_unprepare(host->clk);
|
|
host_free:
|
|
mmc_free_host(mmc);
|
|
return ret;
|
|
}
|
|
|
|
static int mmci_remove(struct amba_device *dev)
|
|
{
|
|
struct mmc_host *mmc = amba_get_drvdata(dev);
|
|
|
|
if (mmc) {
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
struct variant_data *variant = host->variant;
|
|
|
|
/*
|
|
* Undo pm_runtime_put() in probe. We use the _sync
|
|
* version here so that we can access the primecell.
|
|
*/
|
|
pm_runtime_get_sync(&dev->dev);
|
|
|
|
mmc_remove_host(mmc);
|
|
|
|
writel(0, host->base + MMCIMASK0);
|
|
|
|
if (variant->mmcimask1)
|
|
writel(0, host->base + MMCIMASK1);
|
|
|
|
writel(0, host->base + MMCICOMMAND);
|
|
writel(0, host->base + MMCIDATACTRL);
|
|
|
|
mmci_dma_release(host);
|
|
clk_disable_unprepare(host->clk);
|
|
mmc_free_host(mmc);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static void mmci_save(struct mmci_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
writel(0, host->base + MMCIMASK0);
|
|
if (host->variant->pwrreg_nopower) {
|
|
writel(0, host->base + MMCIDATACTRL);
|
|
writel(0, host->base + MMCIPOWER);
|
|
writel(0, host->base + MMCICLOCK);
|
|
}
|
|
mmci_reg_delay(host);
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static void mmci_restore(struct mmci_host *host)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&host->lock, flags);
|
|
|
|
if (host->variant->pwrreg_nopower) {
|
|
writel(host->clk_reg, host->base + MMCICLOCK);
|
|
writel(host->datactrl_reg, host->base + MMCIDATACTRL);
|
|
writel(host->pwr_reg, host->base + MMCIPOWER);
|
|
}
|
|
writel(MCI_IRQENABLE | host->variant->start_err,
|
|
host->base + MMCIMASK0);
|
|
mmci_reg_delay(host);
|
|
|
|
spin_unlock_irqrestore(&host->lock, flags);
|
|
}
|
|
|
|
static int mmci_runtime_suspend(struct device *dev)
|
|
{
|
|
struct amba_device *adev = to_amba_device(dev);
|
|
struct mmc_host *mmc = amba_get_drvdata(adev);
|
|
|
|
if (mmc) {
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
pinctrl_pm_select_sleep_state(dev);
|
|
mmci_save(host);
|
|
clk_disable_unprepare(host->clk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmci_runtime_resume(struct device *dev)
|
|
{
|
|
struct amba_device *adev = to_amba_device(dev);
|
|
struct mmc_host *mmc = amba_get_drvdata(adev);
|
|
|
|
if (mmc) {
|
|
struct mmci_host *host = mmc_priv(mmc);
|
|
clk_prepare_enable(host->clk);
|
|
mmci_restore(host);
|
|
pinctrl_select_default_state(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops mmci_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
|
pm_runtime_force_resume)
|
|
SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct amba_id mmci_ids[] = {
|
|
{
|
|
.id = 0x00041180,
|
|
.mask = 0xff0fffff,
|
|
.data = &variant_arm,
|
|
},
|
|
{
|
|
.id = 0x01041180,
|
|
.mask = 0xff0fffff,
|
|
.data = &variant_arm_extended_fifo,
|
|
},
|
|
{
|
|
.id = 0x02041180,
|
|
.mask = 0xff0fffff,
|
|
.data = &variant_arm_extended_fifo_hwfc,
|
|
},
|
|
{
|
|
.id = 0x00041181,
|
|
.mask = 0x000fffff,
|
|
.data = &variant_arm,
|
|
},
|
|
/* ST Micro variants */
|
|
{
|
|
.id = 0x00180180,
|
|
.mask = 0x00ffffff,
|
|
.data = &variant_u300,
|
|
},
|
|
{
|
|
.id = 0x10180180,
|
|
.mask = 0xf0ffffff,
|
|
.data = &variant_nomadik,
|
|
},
|
|
{
|
|
.id = 0x00280180,
|
|
.mask = 0x00ffffff,
|
|
.data = &variant_nomadik,
|
|
},
|
|
{
|
|
.id = 0x00480180,
|
|
.mask = 0xf0ffffff,
|
|
.data = &variant_ux500,
|
|
},
|
|
{
|
|
.id = 0x10480180,
|
|
.mask = 0xf0ffffff,
|
|
.data = &variant_ux500v2,
|
|
},
|
|
{
|
|
.id = 0x00880180,
|
|
.mask = 0x00ffffff,
|
|
.data = &variant_stm32,
|
|
},
|
|
{
|
|
.id = 0x10153180,
|
|
.mask = 0xf0ffffff,
|
|
.data = &variant_stm32_sdmmc,
|
|
},
|
|
/* Qualcomm variants */
|
|
{
|
|
.id = 0x00051180,
|
|
.mask = 0x000fffff,
|
|
.data = &variant_qcom,
|
|
},
|
|
{ 0, 0 },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(amba, mmci_ids);
|
|
|
|
static struct amba_driver mmci_driver = {
|
|
.drv = {
|
|
.name = DRIVER_NAME,
|
|
.pm = &mmci_dev_pm_ops,
|
|
},
|
|
.probe = mmci_probe,
|
|
.remove = mmci_remove,
|
|
.id_table = mmci_ids,
|
|
};
|
|
|
|
module_amba_driver(mmci_driver);
|
|
|
|
module_param(fmax, uint, 0444);
|
|
|
|
MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
|
|
MODULE_LICENSE("GPL");
|