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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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fsi: Add ast2600 master driver
The ast2600 BMC has a pair of FSI masters in it, behind an AHB to OPB bridge. The master driver supports reads and writes of full words, half word and byte accesses to remote CFAMs. It can perform very basic error recovery through resetting of the FSI port when an error is detected, and the issuing of breaks and terms. Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Alistair Popple <alistair@popple.id.au> -- v2: - remove debugging - squash in fixes Link: https://lore.kernel.org/r/20191108051945.7109-10-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joel Stanley
Greg Kroah-Hartman
parent
cccaa160c3
commit
606397d67f
@ -53,6 +53,14 @@ config FSI_MASTER_AST_CF
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lines driven by the internal ColdFire coprocessor. This requires
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the corresponding machine specific ColdFire firmware to be available.
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config FSI_MASTER_ASPEED
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tristate "FSI ASPEED master"
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help
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This option enables a FSI master that is present behind an OPB bridge
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in the AST2600.
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Enable it for your BMC kernel in an OpenPower or IBM Power system.
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config FSI_SCOM
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tristate "SCOM FSI client device driver"
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---help---
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@ -2,6 +2,7 @@
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obj-$(CONFIG_FSI) += fsi-core.o
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obj-$(CONFIG_FSI_MASTER_HUB) += fsi-master-hub.o
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obj-$(CONFIG_FSI_MASTER_ASPEED) += fsi-master-aspeed.o
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obj-$(CONFIG_FSI_MASTER_GPIO) += fsi-master-gpio.o
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obj-$(CONFIG_FSI_MASTER_AST_CF) += fsi-master-ast-cf.o
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obj-$(CONFIG_FSI_SCOM) += fsi-scom.o
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522
drivers/fsi/fsi-master-aspeed.c
Normal file
522
drivers/fsi/fsi-master-aspeed.c
Normal file
@ -0,0 +1,522 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright (C) IBM Corporation 2018
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// FSI master driver for AST2600
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/fsi.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/iopoll.h>
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#include "fsi-master.h"
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struct fsi_master_aspeed {
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struct fsi_master master;
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struct device *dev;
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void __iomem *base;
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struct clk *clk;
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};
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#define to_fsi_master_aspeed(m) \
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container_of(m, struct fsi_master_aspeed, master)
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/* Control register (size 0x400) */
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static const u32 ctrl_base = 0x80000000;
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static const u32 fsi_base = 0xa0000000;
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#define OPB_FSI_VER 0x00
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#define OPB_TRIGGER 0x04
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#define OPB_CTRL_BASE 0x08
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#define OPB_FSI_BASE 0x0c
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#define OPB_CLK_SYNC 0x3c
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#define OPB_IRQ_CLEAR 0x40
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#define OPB_IRQ_MASK 0x44
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#define OPB_IRQ_STATUS 0x48
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#define OPB0_SELECT 0x10
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#define OPB0_RW 0x14
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#define OPB0_XFER_SIZE 0x18
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#define OPB0_FSI_ADDR 0x1c
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#define OPB0_FSI_DATA_W 0x20
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#define OPB0_STATUS 0x80
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#define OPB0_FSI_DATA_R 0x84
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#define OPB0_WRITE_ORDER1 0x4c
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#define OPB0_WRITE_ORDER2 0x50
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#define OPB1_WRITE_ORDER1 0x54
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#define OPB1_WRITE_ORDER2 0x58
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#define OPB0_READ_ORDER1 0x5c
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#define OPB1_READ_ORDER2 0x60
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#define OPB_RETRY_COUNTER 0x64
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/* OPBn_STATUS */
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#define STATUS_HALFWORD_ACK BIT(0)
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#define STATUS_FULLWORD_ACK BIT(1)
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#define STATUS_ERR_ACK BIT(2)
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#define STATUS_RETRY BIT(3)
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#define STATUS_TIMEOUT BIT(4)
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/* OPB_IRQ_MASK */
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#define OPB1_XFER_ACK_EN BIT(17)
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#define OPB0_XFER_ACK_EN BIT(16)
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/* OPB_RW */
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#define CMD_READ BIT(0)
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#define CMD_WRITE 0
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/* OPBx_XFER_SIZE */
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#define XFER_FULLWORD (BIT(1) | BIT(0))
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#define XFER_HALFWORD (BIT(0))
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#define XFER_BYTE (0)
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#define FSI_LINK_ENABLE_SETUP_TIME 10 /* in mS */
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#define DEFAULT_DIVISOR 14
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#define OPB_POLL_TIMEOUT 10000
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static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
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u32 val, u32 transfer_size)
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{
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void __iomem *base = aspeed->base;
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u32 reg, status;
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int ret;
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writel(CMD_WRITE, base + OPB0_RW);
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writel(transfer_size, base + OPB0_XFER_SIZE);
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writel(addr, base + OPB0_FSI_ADDR);
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writel(val, base + OPB0_FSI_DATA_W);
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writel(0x1, base + OPB_IRQ_CLEAR);
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writel(0x1, base + OPB_TRIGGER);
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ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg,
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(reg & OPB0_XFER_ACK_EN) != 0,
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0, OPB_POLL_TIMEOUT);
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status = readl(base + OPB0_STATUS);
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/* Return error when poll timed out */
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if (ret)
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return ret;
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/* Command failed, master will reset */
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if (status & STATUS_ERR_ACK)
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return -EIO;
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return 0;
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}
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static int opb_writeb(struct fsi_master_aspeed *aspeed, u32 addr, u8 val)
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{
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return __opb_write(aspeed, addr, val, XFER_BYTE);
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}
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static int opb_writew(struct fsi_master_aspeed *aspeed, u32 addr, __be16 val)
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{
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return __opb_write(aspeed, addr, (__force u16)val, XFER_HALFWORD);
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}
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static int opb_writel(struct fsi_master_aspeed *aspeed, u32 addr, __be32 val)
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{
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return __opb_write(aspeed, addr, (__force u32)val, XFER_FULLWORD);
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}
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static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
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u32 transfer_size, void *out)
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{
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void __iomem *base = aspeed->base;
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u32 result, reg;
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int status, ret;
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writel(CMD_READ, base + OPB0_RW);
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writel(transfer_size, base + OPB0_XFER_SIZE);
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writel(addr, base + OPB0_FSI_ADDR);
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writel(0x1, base + OPB_IRQ_CLEAR);
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writel(0x1, base + OPB_TRIGGER);
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ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg,
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(reg & OPB0_XFER_ACK_EN) != 0,
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0, OPB_POLL_TIMEOUT);
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status = readl(base + OPB0_STATUS);
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result = readl(base + OPB0_FSI_DATA_R);
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/* Return error when poll timed out */
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if (ret)
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return ret;
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/* Command failed, master will reset */
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if (status & STATUS_ERR_ACK)
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return -EIO;
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if (out) {
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switch (transfer_size) {
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case XFER_BYTE:
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*(u8 *)out = result;
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break;
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case XFER_HALFWORD:
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*(u16 *)out = result;
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break;
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case XFER_FULLWORD:
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*(u32 *)out = result;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static int opb_readl(struct fsi_master_aspeed *aspeed, uint32_t addr, __be32 *out)
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{
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return __opb_read(aspeed, addr, XFER_FULLWORD, out);
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}
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static int opb_readw(struct fsi_master_aspeed *aspeed, uint32_t addr, __be16 *out)
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{
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return __opb_read(aspeed, addr, XFER_HALFWORD, (void *)out);
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}
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static int opb_readb(struct fsi_master_aspeed *aspeed, uint32_t addr, u8 *out)
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{
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return __opb_read(aspeed, addr, XFER_BYTE, (void *)out);
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}
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static int check_errors(struct fsi_master_aspeed *aspeed, int err)
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{
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int ret;
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if (err == -EIO) {
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/* Check MAEB (0x70) ? */
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/* Then clear errors in master */
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ret = opb_writel(aspeed, ctrl_base + FSI_MRESP0,
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cpu_to_be32(FSI_MRESP_RST_ALL_MASTER));
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if (ret) {
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/* TODO: log? return different code? */
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return ret;
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}
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/* TODO: confirm that 0x70 was okay */
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}
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/* This will pass through timeout errors */
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return err;
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}
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static int aspeed_master_read(struct fsi_master *master, int link,
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uint8_t id, uint32_t addr, void *val, size_t size)
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{
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struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
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int ret;
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if (id != 0)
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return -EINVAL;
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addr += link * FSI_HUB_LINK_SIZE;
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switch (size) {
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case 1:
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ret = opb_readb(aspeed, fsi_base + addr, val);
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break;
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case 2:
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ret = opb_readw(aspeed, fsi_base + addr, val);
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break;
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case 4:
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ret = opb_readl(aspeed, fsi_base + addr, val);
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break;
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default:
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return -EINVAL;
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}
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ret = check_errors(aspeed, ret);
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if (ret)
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return ret;
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return 0;
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}
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static int aspeed_master_write(struct fsi_master *master, int link,
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uint8_t id, uint32_t addr, const void *val, size_t size)
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{
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struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
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int ret;
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if (id != 0)
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return -EINVAL;
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addr += link * FSI_HUB_LINK_SIZE;
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switch (size) {
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case 1:
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ret = opb_writeb(aspeed, fsi_base + addr, *(u8 *)val);
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break;
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case 2:
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ret = opb_writew(aspeed, fsi_base + addr, *(__be16 *)val);
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break;
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case 4:
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ret = opb_writel(aspeed, fsi_base + addr, *(__be32 *)val);
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break;
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default:
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return -EINVAL;
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}
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ret = check_errors(aspeed, ret);
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if (ret)
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return ret;
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return 0;
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}
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static int aspeed_master_link_enable(struct fsi_master *master, int link)
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{
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struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
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int idx, bit, ret;
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__be32 reg, result;
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idx = link / 32;
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bit = link % 32;
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reg = cpu_to_be32(0x80000000 >> bit);
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ret = opb_writel(aspeed, ctrl_base + FSI_MSENP0 + (4 * idx), reg);
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if (ret)
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return ret;
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mdelay(FSI_LINK_ENABLE_SETUP_TIME);
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ret = opb_readl(aspeed, ctrl_base + FSI_MENP0 + (4 * idx), &result);
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if (ret)
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return ret;
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if (result != reg) {
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dev_err(aspeed->dev, "%s failed: %08x\n", __func__, result);
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return -EIO;
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}
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return 0;
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}
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static int aspeed_master_term(struct fsi_master *master, int link, uint8_t id)
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{
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uint32_t addr;
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__be32 cmd;
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addr = 0x4;
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cmd = cpu_to_be32(0xecc00000);
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return aspeed_master_write(master, link, id, addr, &cmd, 4);
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}
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static int aspeed_master_break(struct fsi_master *master, int link)
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{
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uint32_t addr;
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__be32 cmd;
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addr = 0x0;
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cmd = cpu_to_be32(0xc0de0000);
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return aspeed_master_write(master, link, 0, addr, &cmd, 4);
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}
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static void aspeed_master_release(struct device *dev)
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{
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struct fsi_master_aspeed *aspeed =
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to_fsi_master_aspeed(dev_to_fsi_master(dev));
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kfree(aspeed);
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}
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/* mmode encoders */
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static inline u32 fsi_mmode_crs0(u32 x)
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{
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return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
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}
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static inline u32 fsi_mmode_crs1(u32 x)
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{
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return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
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}
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static int aspeed_master_init(struct fsi_master_aspeed *aspeed)
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{
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__be32 reg;
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reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
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| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
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opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
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/* Initialize the MFSI (hub master) engine */
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reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
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| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
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opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
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reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
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opb_writel(aspeed, ctrl_base + FSI_MECTRL, reg);
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reg = cpu_to_be32(FSI_MMODE_ECRC | FSI_MMODE_EPC | FSI_MMODE_RELA
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| fsi_mmode_crs0(DEFAULT_DIVISOR)
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| fsi_mmode_crs1(DEFAULT_DIVISOR)
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| FSI_MMODE_P8_TO_LSB);
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opb_writel(aspeed, ctrl_base + FSI_MMODE, reg);
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reg = cpu_to_be32(0xffff0000);
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opb_writel(aspeed, ctrl_base + FSI_MDLYR, reg);
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reg = cpu_to_be32(~0);
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opb_writel(aspeed, ctrl_base + FSI_MSENP0, reg);
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/* Leave enabled long enough for master logic to set up */
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mdelay(FSI_LINK_ENABLE_SETUP_TIME);
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opb_writel(aspeed, ctrl_base + FSI_MCENP0, reg);
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opb_readl(aspeed, ctrl_base + FSI_MAEB, NULL);
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reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK);
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opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
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opb_readl(aspeed, ctrl_base + FSI_MLEVP0, NULL);
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/* Reset the master bridge */
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reg = cpu_to_be32(FSI_MRESB_RST_GEN);
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opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
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reg = cpu_to_be32(FSI_MRESB_RST_ERR);
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opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
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return 0;
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}
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static int fsi_master_aspeed_probe(struct platform_device *pdev)
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{
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struct fsi_master_aspeed *aspeed;
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struct resource *res;
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int rc, links, reg;
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__be32 raw;
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aspeed = devm_kzalloc(&pdev->dev, sizeof(*aspeed), GFP_KERNEL);
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if (!aspeed)
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return -ENOMEM;
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aspeed->dev = &pdev->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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aspeed->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(aspeed->base))
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return PTR_ERR(aspeed->base);
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aspeed->clk = devm_clk_get(aspeed->dev, NULL);
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if (IS_ERR(aspeed->clk)) {
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dev_err(aspeed->dev, "couldn't get clock\n");
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return PTR_ERR(aspeed->clk);
|
||||
}
|
||||
rc = clk_prepare_enable(aspeed->clk);
|
||||
if (rc) {
|
||||
dev_err(aspeed->dev, "couldn't enable clock\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
writel(0x1, aspeed->base + OPB_CLK_SYNC);
|
||||
writel(OPB1_XFER_ACK_EN | OPB0_XFER_ACK_EN,
|
||||
aspeed->base + OPB_IRQ_MASK);
|
||||
|
||||
/* TODO: determine an appropriate value */
|
||||
writel(0x10, aspeed->base + OPB_RETRY_COUNTER);
|
||||
|
||||
writel(ctrl_base, aspeed->base + OPB_CTRL_BASE);
|
||||
writel(fsi_base, aspeed->base + OPB_FSI_BASE);
|
||||
|
||||
/* Set read data order */
|
||||
writel(0x0011bb1b, aspeed->base + OPB0_READ_ORDER1);
|
||||
|
||||
/* Set write data order */
|
||||
writel(0x0011bb1b, aspeed->base + OPB0_WRITE_ORDER1);
|
||||
writel(0xffaa5500, aspeed->base + OPB0_WRITE_ORDER2);
|
||||
|
||||
/*
|
||||
* Select OPB0 for all operations.
|
||||
* Will need to be reworked when enabling DMA or anything that uses
|
||||
* OPB1.
|
||||
*/
|
||||
writel(0x1, aspeed->base + OPB0_SELECT);
|
||||
|
||||
rc = opb_readl(aspeed, ctrl_base + FSI_MVER, &raw);
|
||||
if (rc) {
|
||||
dev_err(&pdev->dev, "failed to read hub version\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
reg = be32_to_cpu(raw);
|
||||
links = (reg >> 8) & 0xff;
|
||||
dev_info(&pdev->dev, "hub version %08x (%d links)\n", reg, links);
|
||||
|
||||
aspeed->master.dev.parent = &pdev->dev;
|
||||
aspeed->master.dev.release = aspeed_master_release;
|
||||
aspeed->master.dev.of_node = of_node_get(dev_of_node(&pdev->dev));
|
||||
|
||||
aspeed->master.n_links = links;
|
||||
aspeed->master.read = aspeed_master_read;
|
||||
aspeed->master.write = aspeed_master_write;
|
||||
aspeed->master.send_break = aspeed_master_break;
|
||||
aspeed->master.term = aspeed_master_term;
|
||||
aspeed->master.link_enable = aspeed_master_link_enable;
|
||||
|
||||
dev_set_drvdata(&pdev->dev, aspeed);
|
||||
|
||||
aspeed_master_init(aspeed);
|
||||
|
||||
rc = fsi_master_register(&aspeed->master);
|
||||
if (rc)
|
||||
goto err_release;
|
||||
|
||||
/* At this point, fsi_master_register performs the device_initialize(),
|
||||
* and holds the sole reference on master.dev. This means the device
|
||||
* will be freed (via ->release) during any subsequent call to
|
||||
* fsi_master_unregister. We add our own reference to it here, so we
|
||||
* can perform cleanup (in _remove()) without it being freed before
|
||||
* we're ready.
|
||||
*/
|
||||
get_device(&aspeed->master.dev);
|
||||
return 0;
|
||||
|
||||
err_release:
|
||||
clk_disable_unprepare(aspeed->clk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int fsi_master_aspeed_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct fsi_master_aspeed *aspeed = platform_get_drvdata(pdev);
|
||||
|
||||
fsi_master_unregister(&aspeed->master);
|
||||
clk_disable_unprepare(aspeed->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id fsi_master_aspeed_match[] = {
|
||||
{ .compatible = "aspeed,ast2600-fsi-master" },
|
||||
{ },
|
||||
};
|
||||
|
||||
static struct platform_driver fsi_master_aspeed_driver = {
|
||||
.driver = {
|
||||
.name = "fsi-master-aspeed",
|
||||
.of_match_table = fsi_master_aspeed_match,
|
||||
},
|
||||
.probe = fsi_master_aspeed_probe,
|
||||
.remove = fsi_master_aspeed_remove,
|
||||
};
|
||||
|
||||
module_platform_driver(fsi_master_aspeed_driver);
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user