mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 15:20:58 +07:00
spi: add spi_tegra driver
v2 changes:
from Thierry Reding:
* add "select TEGRA_SYSTEM_DMA" to Kconfig
from Grant Likely:
* add oneline description to header
* inline references to DRIVER_NAME
* inline references to BUSY_TIMEOUT
* open coded bytes_per_word()
* spi_readl/writel -> spi_tegra_readl/writel
* move transfer validation to spi_tegra_transfer
* don't request_mem_region iomem as platform bus does that for us
* __exit -> __devexit
v3 changes:
from Russell King:
* put request_mem_region back int
from Grant Likely:
* remove #undef DEBUG
* add SLINK_ to register bit defines
* remove unused bytes_per_word
* make spi_tegra_readl/writel static linine
* various refactoring for clarity
* mark err if BSY bit is not cleared after 1000 retries
* move spinlock to protect setting of RDY bit
* subsys_initcall -> module_init
v3 changes:
from Grant Likely:
* update spi_tegra to use PTR_ERRless dma API
v4 changes:
from Grant Likely:
* remove empty spi_tegra_cleanup fucntion
* allow device ids of -1
Signed-off-by: Erik Gilling <konkers@android.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Russell King <linux@arm.linux.org.uk>
spi: tegra: cleanups from upstream review
Change-Id: Icecf7e64efcb39de072a15234ba1faa4bad40d25
Signed-off-by: Erik Gilling <konkers@android.com>
This commit is contained in:
Erik Gilling
Colin Cross
parent
f2a443931e
commit
0c03a1dd5b
@ -329,6 +329,13 @@ config SPI_STMP3XXX
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help
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SPI driver for Freescale STMP37xx/378x SoC SSP interface
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config SPI_TEGRA
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tristate "Nvidia Tegra SPI controller"
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depends on ARCH_TEGRA
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select TEGRA_SYSTEM_DMA
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help
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SPI driver for NVidia Tegra SoCs
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config SPI_TOPCLIFF_PCH
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tristate "Topcliff PCH SPI Controller"
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depends on PCI
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@ -39,6 +39,7 @@ obj-$(CONFIG_SPI_PPC4xx) += spi_ppc4xx.o
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obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o
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obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx_hw.o
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obj-$(CONFIG_SPI_S3C64XX) += spi_s3c64xx.o
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obj-$(CONFIG_SPI_TEGRA) += spi_tegra.o
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obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi_topcliff_pch.o
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obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
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obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
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618
drivers/spi/spi_tegra.c
Normal file
618
drivers/spi/spi_tegra.c
Normal file
@ -0,0 +1,618 @@
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/*
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* Driver for Nvidia TEGRA spi controller.
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*
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* Copyright (C) 2010 Google, Inc.
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*
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* Author:
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* Erik Gilling <konkers@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/spi/spi.h>
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#include <mach/dma.h>
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#define SLINK_COMMAND 0x000
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#define SLINK_BIT_LENGTH(x) (((x) & 0x1f) << 0)
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#define SLINK_WORD_SIZE(x) (((x) & 0x1f) << 5)
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#define SLINK_BOTH_EN (1 << 10)
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#define SLINK_CS_SW (1 << 11)
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#define SLINK_CS_VALUE (1 << 12)
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#define SLINK_CS_POLARITY (1 << 13)
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#define SLINK_IDLE_SDA_DRIVE_LOW (0 << 16)
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#define SLINK_IDLE_SDA_DRIVE_HIGH (1 << 16)
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#define SLINK_IDLE_SDA_PULL_LOW (2 << 16)
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#define SLINK_IDLE_SDA_PULL_HIGH (3 << 16)
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#define SLINK_IDLE_SDA_MASK (3 << 16)
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#define SLINK_CS_POLARITY1 (1 << 20)
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#define SLINK_CK_SDA (1 << 21)
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#define SLINK_CS_POLARITY2 (1 << 22)
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#define SLINK_CS_POLARITY3 (1 << 23)
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#define SLINK_IDLE_SCLK_DRIVE_LOW (0 << 24)
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#define SLINK_IDLE_SCLK_DRIVE_HIGH (1 << 24)
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#define SLINK_IDLE_SCLK_PULL_LOW (2 << 24)
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#define SLINK_IDLE_SCLK_PULL_HIGH (3 << 24)
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#define SLINK_IDLE_SCLK_MASK (3 << 24)
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#define SLINK_M_S (1 << 28)
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#define SLINK_WAIT (1 << 29)
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#define SLINK_GO (1 << 30)
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#define SLINK_ENB (1 << 31)
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#define SLINK_COMMAND2 0x004
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#define SLINK_LSBFE (1 << 0)
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#define SLINK_SSOE (1 << 1)
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#define SLINK_SPIE (1 << 4)
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#define SLINK_BIDIROE (1 << 6)
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#define SLINK_MODFEN (1 << 7)
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#define SLINK_INT_SIZE(x) (((x) & 0x1f) << 8)
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#define SLINK_CS_ACTIVE_BETWEEN (1 << 17)
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#define SLINK_SS_EN_CS(x) (((x) & 0x3) << 18)
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#define SLINK_SS_SETUP(x) (((x) & 0x3) << 20)
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#define SLINK_FIFO_REFILLS_0 (0 << 22)
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#define SLINK_FIFO_REFILLS_1 (1 << 22)
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#define SLINK_FIFO_REFILLS_2 (2 << 22)
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#define SLINK_FIFO_REFILLS_3 (3 << 22)
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#define SLINK_FIFO_REFILLS_MASK (3 << 22)
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#define SLINK_WAIT_PACK_INT(x) (((x) & 0x7) << 26)
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#define SLINK_SPC0 (1 << 29)
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#define SLINK_TXEN (1 << 30)
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#define SLINK_RXEN (1 << 31)
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#define SLINK_STATUS 0x008
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#define SLINK_COUNT(val) (((val) >> 0) & 0x1f)
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#define SLINK_WORD(val) (((val) >> 5) & 0x1f)
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#define SLINK_BLK_CNT(val) (((val) >> 0) & 0xffff)
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#define SLINK_MODF (1 << 16)
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#define SLINK_RX_UNF (1 << 18)
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#define SLINK_TX_OVF (1 << 19)
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#define SLINK_TX_FULL (1 << 20)
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#define SLINK_TX_EMPTY (1 << 21)
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#define SLINK_RX_FULL (1 << 22)
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#define SLINK_RX_EMPTY (1 << 23)
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#define SLINK_TX_UNF (1 << 24)
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#define SLINK_RX_OVF (1 << 25)
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#define SLINK_TX_FLUSH (1 << 26)
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#define SLINK_RX_FLUSH (1 << 27)
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#define SLINK_SCLK (1 << 28)
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#define SLINK_ERR (1 << 29)
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#define SLINK_RDY (1 << 30)
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#define SLINK_BSY (1 << 31)
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#define SLINK_MAS_DATA 0x010
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#define SLINK_SLAVE_DATA 0x014
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#define SLINK_DMA_CTL 0x018
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#define SLINK_DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0)
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#define SLINK_TX_TRIG_1 (0 << 16)
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#define SLINK_TX_TRIG_4 (1 << 16)
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#define SLINK_TX_TRIG_8 (2 << 16)
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#define SLINK_TX_TRIG_16 (3 << 16)
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#define SLINK_TX_TRIG_MASK (3 << 16)
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#define SLINK_RX_TRIG_1 (0 << 18)
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#define SLINK_RX_TRIG_4 (1 << 18)
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#define SLINK_RX_TRIG_8 (2 << 18)
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#define SLINK_RX_TRIG_16 (3 << 18)
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#define SLINK_RX_TRIG_MASK (3 << 18)
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#define SLINK_PACKED (1 << 20)
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#define SLINK_PACK_SIZE_4 (0 << 21)
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#define SLINK_PACK_SIZE_8 (1 << 21)
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#define SLINK_PACK_SIZE_16 (2 << 21)
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#define SLINK_PACK_SIZE_32 (3 << 21)
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#define SLINK_PACK_SIZE_MASK (3 << 21)
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#define SLINK_IE_TXC (1 << 26)
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#define SLINK_IE_RXC (1 << 27)
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#define SLINK_DMA_EN (1 << 31)
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#define SLINK_STATUS2 0x01c
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#define SLINK_TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0)
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#define SLINK_RX_FIFO_FULL_COUNT(val) (((val) & 0x3f) >> 16)
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#define SLINK_TX_FIFO 0x100
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#define SLINK_RX_FIFO 0x180
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static const unsigned long spi_tegra_req_sels[] = {
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TEGRA_DMA_REQ_SEL_SL2B1,
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TEGRA_DMA_REQ_SEL_SL2B2,
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TEGRA_DMA_REQ_SEL_SL2B3,
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TEGRA_DMA_REQ_SEL_SL2B4,
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};
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#define BB_LEN 32
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struct spi_tegra_data {
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struct spi_master *master;
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struct platform_device *pdev;
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spinlock_t lock;
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struct clk *clk;
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void __iomem *base;
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unsigned long phys;
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u32 cur_speed;
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struct list_head queue;
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struct spi_transfer *cur;
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unsigned cur_pos;
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unsigned cur_len;
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unsigned cur_bytes_per_word;
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/* The tegra spi controller has a bug which causes the first word
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* in PIO transactions to be garbage. Since packed DMA transactions
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* require transfers to be 4 byte aligned we need a bounce buffer
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* for the generic case.
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*/
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struct tegra_dma_req rx_dma_req;
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struct tegra_dma_channel *rx_dma;
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u32 *rx_bb;
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dma_addr_t rx_bb_phys;
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};
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static inline unsigned long spi_tegra_readl(struct spi_tegra_data *tspi,
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unsigned long reg)
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{
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return readl(tspi->base + reg);
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}
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static inline void spi_tegra_writel(struct spi_tegra_data *tspi,
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unsigned long val,
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unsigned long reg)
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{
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writel(val, tspi->base + reg);
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}
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static void spi_tegra_go(struct spi_tegra_data *tspi)
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{
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unsigned long val;
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wmb();
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val = spi_tegra_readl(tspi, SLINK_DMA_CTL);
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val &= ~SLINK_DMA_BLOCK_SIZE(~0) & ~SLINK_DMA_EN;
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val |= SLINK_DMA_BLOCK_SIZE(tspi->rx_dma_req.size / 4 - 1);
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spi_tegra_writel(tspi, val, SLINK_DMA_CTL);
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tegra_dma_enqueue_req(tspi->rx_dma, &tspi->rx_dma_req);
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val |= SLINK_DMA_EN;
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spi_tegra_writel(tspi, val, SLINK_DMA_CTL);
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}
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static unsigned spi_tegra_fill_tx_fifo(struct spi_tegra_data *tspi,
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struct spi_transfer *t)
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{
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unsigned len = min(t->len - tspi->cur_pos, BB_LEN *
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tspi->cur_bytes_per_word);
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u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_pos;
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int i, j;
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unsigned long val;
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val = spi_tegra_readl(tspi, SLINK_COMMAND);
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val &= ~SLINK_WORD_SIZE(~0);
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val |= SLINK_WORD_SIZE(len / tspi->cur_bytes_per_word - 1);
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spi_tegra_writel(tspi, val, SLINK_COMMAND);
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for (i = 0; i < len; i += tspi->cur_bytes_per_word) {
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val = 0;
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for (j = 0; j < tspi->cur_bytes_per_word; j++)
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val |= tx_buf[i + j] << j * 8;
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spi_tegra_writel(tspi, val, SLINK_TX_FIFO);
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}
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tspi->rx_dma_req.size = len / tspi->cur_bytes_per_word * 4;
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return len;
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}
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static unsigned spi_tegra_drain_rx_fifo(struct spi_tegra_data *tspi,
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struct spi_transfer *t)
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{
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unsigned len = tspi->cur_len;
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u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_pos;
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int i, j;
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unsigned long val;
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for (i = 0; i < len; i += tspi->cur_bytes_per_word) {
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val = tspi->rx_bb[i / tspi->cur_bytes_per_word];
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for (j = 0; j < tspi->cur_bytes_per_word; j++)
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rx_buf[i + j] = (val >> (j * 8)) & 0xff;
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}
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return len;
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}
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static void spi_tegra_start_transfer(struct spi_device *spi,
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struct spi_transfer *t)
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{
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struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
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u32 speed;
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u8 bits_per_word;
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unsigned long val;
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speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
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bits_per_word = t->bits_per_word ? t->bits_per_word :
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spi->bits_per_word;
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tspi->cur_bytes_per_word = (bits_per_word - 1) / 8 + 1;
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if (speed != tspi->cur_speed)
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clk_set_rate(tspi->clk, speed);
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if (tspi->cur_speed == 0)
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clk_enable(tspi->clk);
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tspi->cur_speed = speed;
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val = spi_tegra_readl(tspi, SLINK_COMMAND2);
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val &= ~SLINK_SS_EN_CS(~0) | SLINK_RXEN | SLINK_TXEN;
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if (t->rx_buf)
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val |= SLINK_RXEN;
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if (t->tx_buf)
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val |= SLINK_TXEN;
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val |= SLINK_SS_EN_CS(spi->chip_select);
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val |= SLINK_SPIE;
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spi_tegra_writel(tspi, val, SLINK_COMMAND2);
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val = spi_tegra_readl(tspi, SLINK_COMMAND);
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val &= ~SLINK_BIT_LENGTH(~0);
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val |= SLINK_BIT_LENGTH(bits_per_word - 1);
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/* FIXME: should probably control CS manually so that we can be sure
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* it does not go low between transfer and to support delay_usecs
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* correctly.
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*/
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val &= ~SLINK_IDLE_SCLK_MASK & ~SLINK_CK_SDA & ~SLINK_CS_SW;
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if (spi->mode & SPI_CPHA)
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val |= SLINK_CK_SDA;
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if (spi->mode & SPI_CPOL)
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val |= SLINK_IDLE_SCLK_DRIVE_HIGH;
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else
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val |= SLINK_IDLE_SCLK_DRIVE_LOW;
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val |= SLINK_M_S;
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spi_tegra_writel(tspi, val, SLINK_COMMAND);
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spi_tegra_writel(tspi, SLINK_RX_FLUSH | SLINK_TX_FLUSH, SLINK_STATUS);
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tspi->cur = t;
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tspi->cur_pos = 0;
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tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, t);
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spi_tegra_go(tspi);
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}
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static void spi_tegra_start_message(struct spi_device *spi,
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struct spi_message *m)
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{
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struct spi_transfer *t;
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m->actual_length = 0;
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m->status = 0;
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t = list_first_entry(&m->transfers, struct spi_transfer, transfer_list);
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spi_tegra_start_transfer(spi, t);
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}
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static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req)
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{
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struct spi_tegra_data *tspi = req->dev;
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unsigned long flags;
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struct spi_message *m;
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struct spi_device *spi;
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int timeout = 0;
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unsigned long val;
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/* the SPI controller may come back with both the BSY and RDY bits
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* set. In this case we need to wait for the BSY bit to clear so
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* that we are sure the DMA is finished. 1000 reads was empirically
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* determined to be long enough.
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*/
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while (timeout++ < 1000) {
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if (!(spi_tegra_readl(tspi, SLINK_STATUS) & SLINK_BSY))
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break;
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}
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spin_lock_irqsave(&tspi->lock, flags);
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if (timeout >= 1000)
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m->status = -EIO;
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val = spi_tegra_readl(tspi, SLINK_STATUS);
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val |= SLINK_RDY;
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spi_tegra_writel(tspi, val, SLINK_STATUS);
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m = list_first_entry(&tspi->queue, struct spi_message, queue);
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spi = m->state;
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tspi->cur_pos += spi_tegra_drain_rx_fifo(tspi, tspi->cur);
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m->actual_length += tspi->cur_pos;
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if (tspi->cur_pos < tspi->cur->len) {
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tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, tspi->cur);
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spi_tegra_go(tspi);
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} else if (!list_is_last(&tspi->cur->transfer_list,
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&m->transfers)) {
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tspi->cur = list_first_entry(&tspi->cur->transfer_list,
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struct spi_transfer,
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transfer_list);
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spi_tegra_start_transfer(spi, tspi->cur);
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} else {
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list_del(&m->queue);
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m->complete(m->context);
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||||
|
||||
if (!list_empty(&tspi->queue)) {
|
||||
m = list_first_entry(&tspi->queue, struct spi_message,
|
||||
queue);
|
||||
spi = m->state;
|
||||
spi_tegra_start_message(spi, m);
|
||||
} else {
|
||||
clk_disable(tspi->clk);
|
||||
tspi->cur_speed = 0;
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&tspi->lock, flags);
|
||||
}
|
||||
|
||||
static int spi_tegra_setup(struct spi_device *spi)
|
||||
{
|
||||
struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
|
||||
unsigned long cs_bit;
|
||||
unsigned long val;
|
||||
unsigned long flags;
|
||||
|
||||
dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n",
|
||||
spi->bits_per_word,
|
||||
spi->mode & SPI_CPOL ? "" : "~",
|
||||
spi->mode & SPI_CPHA ? "" : "~",
|
||||
spi->max_speed_hz);
|
||||
|
||||
|
||||
switch (spi->chip_select) {
|
||||
case 0:
|
||||
cs_bit = SLINK_CS_POLARITY;
|
||||
break;
|
||||
|
||||
case 1:
|
||||
cs_bit = SLINK_CS_POLARITY1;
|
||||
break;
|
||||
|
||||
case 2:
|
||||
cs_bit = SLINK_CS_POLARITY2;
|
||||
break;
|
||||
|
||||
case 4:
|
||||
cs_bit = SLINK_CS_POLARITY3;
|
||||
break;
|
||||
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&tspi->lock, flags);
|
||||
|
||||
val = spi_tegra_readl(tspi, SLINK_COMMAND);
|
||||
if (spi->mode & SPI_CS_HIGH)
|
||||
val |= cs_bit;
|
||||
else
|
||||
val &= ~cs_bit;
|
||||
spi_tegra_writel(tspi, val, SLINK_COMMAND);
|
||||
|
||||
spin_unlock_irqrestore(&tspi->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int spi_tegra_transfer(struct spi_device *spi, struct spi_message *m)
|
||||
{
|
||||
struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
|
||||
struct spi_transfer *t;
|
||||
unsigned long flags;
|
||||
int was_empty;
|
||||
|
||||
if (list_empty(&m->transfers) || !m->complete)
|
||||
return -EINVAL;
|
||||
|
||||
list_for_each_entry(t, &m->transfers, transfer_list) {
|
||||
if (t->bits_per_word < 0 || t->bits_per_word > 32)
|
||||
return -EINVAL;
|
||||
|
||||
if (t->len == 0)
|
||||
return -EINVAL;
|
||||
|
||||
if (!t->rx_buf && !t->tx_buf)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
m->state = spi;
|
||||
|
||||
spin_lock_irqsave(&tspi->lock, flags);
|
||||
was_empty = list_empty(&tspi->queue);
|
||||
list_add_tail(&m->queue, &tspi->queue);
|
||||
|
||||
if (was_empty)
|
||||
spi_tegra_start_message(spi, m);
|
||||
|
||||
spin_unlock_irqrestore(&tspi->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init spi_tegra_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct spi_master *master;
|
||||
struct spi_tegra_data *tspi;
|
||||
struct resource *r;
|
||||
int ret;
|
||||
|
||||
master = spi_alloc_master(&pdev->dev, sizeof *tspi);
|
||||
if (master == NULL) {
|
||||
dev_err(&pdev->dev, "master allocation failed\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* the spi->mode bits understood by this driver: */
|
||||
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
|
||||
|
||||
master->bus_num = pdev->id;
|
||||
|
||||
master->setup = spi_tegra_setup;
|
||||
master->transfer = spi_tegra_transfer;
|
||||
master->num_chipselect = 4;
|
||||
|
||||
dev_set_drvdata(&pdev->dev, master);
|
||||
tspi = spi_master_get_devdata(master);
|
||||
tspi->master = master;
|
||||
tspi->pdev = pdev;
|
||||
spin_lock_init(&tspi->lock);
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (r == NULL) {
|
||||
ret = -ENODEV;
|
||||
goto err0;
|
||||
}
|
||||
|
||||
if (!request_mem_region(r->start, (r->end - r->start) + 1,
|
||||
dev_name(&pdev->dev))) {
|
||||
ret = -EBUSY;
|
||||
goto err0;
|
||||
}
|
||||
|
||||
tspi->phys = r->start;
|
||||
tspi->base = ioremap(r->start, r->end - r->start + 1);
|
||||
if (!tspi->base) {
|
||||
dev_err(&pdev->dev, "can't ioremap iomem\n");
|
||||
ret = -ENOMEM;
|
||||
goto err1;
|
||||
}
|
||||
|
||||
tspi->clk = clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR_OR_NULL(tspi->clk)) {
|
||||
dev_err(&pdev->dev, "can not get clock\n");
|
||||
ret = PTR_ERR(tspi->clk);
|
||||
goto err2;
|
||||
}
|
||||
|
||||
INIT_LIST_HEAD(&tspi->queue);
|
||||
|
||||
tspi->rx_dma = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
|
||||
if (!tspi->rx_dma) {
|
||||
dev_err(&pdev->dev, "can not allocate rx dma channel\n");
|
||||
ret = -ENODEV;
|
||||
goto err3;
|
||||
}
|
||||
|
||||
tspi->rx_bb = dma_alloc_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
|
||||
&tspi->rx_bb_phys, GFP_KERNEL);
|
||||
if (!tspi->rx_bb) {
|
||||
dev_err(&pdev->dev, "can not allocate rx bounce buffer\n");
|
||||
ret = -ENOMEM;
|
||||
goto err4;
|
||||
}
|
||||
|
||||
tspi->rx_dma_req.complete = tegra_spi_rx_dma_complete;
|
||||
tspi->rx_dma_req.to_memory = 1;
|
||||
tspi->rx_dma_req.dest_addr = tspi->rx_bb_phys;
|
||||
tspi->rx_dma_req.dest_bus_width = 32;
|
||||
tspi->rx_dma_req.source_addr = tspi->phys + SLINK_RX_FIFO;
|
||||
tspi->rx_dma_req.source_bus_width = 32;
|
||||
tspi->rx_dma_req.source_wrap = 4;
|
||||
tspi->rx_dma_req.req_sel = spi_tegra_req_sels[pdev->id];
|
||||
tspi->rx_dma_req.dev = tspi;
|
||||
|
||||
ret = spi_register_master(master);
|
||||
|
||||
if (ret < 0)
|
||||
goto err5;
|
||||
|
||||
return ret;
|
||||
|
||||
err5:
|
||||
dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
|
||||
tspi->rx_bb, tspi->rx_bb_phys);
|
||||
err4:
|
||||
tegra_dma_free_channel(tspi->rx_dma);
|
||||
err3:
|
||||
clk_put(tspi->clk);
|
||||
err2:
|
||||
iounmap(tspi->base);
|
||||
err1:
|
||||
release_mem_region(r->start, (r->end - r->start) + 1);
|
||||
err0:
|
||||
spi_master_put(master);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit spi_tegra_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct spi_master *master;
|
||||
struct spi_tegra_data *tspi;
|
||||
struct resource *r;
|
||||
|
||||
master = dev_get_drvdata(&pdev->dev);
|
||||
tspi = spi_master_get_devdata(master);
|
||||
|
||||
tegra_dma_free_channel(tspi->rx_dma);
|
||||
|
||||
dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
|
||||
tspi->rx_bb, tspi->rx_bb_phys);
|
||||
|
||||
clk_put(tspi->clk);
|
||||
iounmap(tspi->base);
|
||||
|
||||
spi_master_put(master);
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
release_mem_region(r->start, (r->end - r->start) + 1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
MODULE_ALIAS("platform:spi_tegra");
|
||||
|
||||
static struct platform_driver spi_tegra_driver = {
|
||||
.driver = {
|
||||
.name = "spi_tegra",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.remove = __devexit_p(spi_tegra_remove),
|
||||
};
|
||||
|
||||
static int __init spi_tegra_init(void)
|
||||
{
|
||||
return platform_driver_probe(&spi_tegra_driver, spi_tegra_probe);
|
||||
}
|
||||
module_init(spi_tegra_init);
|
||||
|
||||
static void __exit spi_tegra_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&spi_tegra_driver);
|
||||
}
|
||||
module_exit(spi_tegra_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user