[PATCH] mmc: remove imxmmc driver
Sascha Hauer
s.hauer at pengutronix.de
Wed Apr 11 15:55:03 EDT 2012
This driver is broken since 2.6.31 when the traditional i.MX1
support was removed.
In theory the i.MX1 mmc controller can be supported by the mxcmmc
driver which basically is the same hardware. However, the i.MX1
controller has severe bugs which made several workarounds necessary which
resulted in a different driver structure. At that time it seemed easier
to write a second driver to support hardware without bugs.
As noone cared for the i.MX1 driver for a long time and it does
not compile, remove it.
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
drivers/mmc/host/Kconfig | 10 -
drivers/mmc/host/Makefile | 1 -
drivers/mmc/host/imxmmc.c | 1169 ---------------------------------------------
3 files changed, 1180 deletions(-)
delete mode 100644 drivers/mmc/host/imxmmc.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 2bc06e7..9f1f5e2 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -307,16 +307,6 @@ config MMC_ATMELMCI_DMA
If unsure, say N.
-config MMC_IMX
- tristate "Motorola i.MX Multimedia Card Interface support"
- depends on ARCH_MX1
- help
- This selects the Motorola i.MX Multimedia card Interface.
- If you have a i.MX platform with a Multimedia Card slot,
- say Y or M here.
-
- If unsure, say N.
-
config MMC_MSM
tristate "Qualcomm SDCC Controller Support"
depends on MMC && ARCH_MSM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 3e7e26d..8922b06 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -4,7 +4,6 @@
obj-$(CONFIG_MMC_ARMMMCI) += mmci.o
obj-$(CONFIG_MMC_PXA) += pxamci.o
-obj-$(CONFIG_MMC_IMX) += imxmmc.o
obj-$(CONFIG_MMC_MXC) += mxcmmc.o
obj-$(CONFIG_MMC_MXS) += mxs-mmc.o
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
diff --git a/drivers/mmc/host/imxmmc.c b/drivers/mmc/host/imxmmc.c
deleted file mode 100644
index ea0f3ce..0000000
--- a/drivers/mmc/host/imxmmc.c
+++ /dev/null
@@ -1,1169 +0,0 @@
-/*
- * linux/drivers/mmc/host/imxmmc.c - Motorola i.MX MMCI driver
- *
- * Copyright (C) 2004 Sascha Hauer, Pengutronix <sascha at saschahauer.de>
- * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa at pikron.com>
- *
- * derived from pxamci.c by Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/blkdev.h>
-#include <linux/dma-mapping.h>
-#include <linux/mmc/host.h>
-#include <linux/mmc/card.h>
-#include <linux/delay.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-
-#include <asm/dma.h>
-#include <asm/irq.h>
-#include <asm/sizes.h>
-#include <mach/mmc.h>
-#include <mach/imx-dma.h>
-
-#include "imxmmc.h"
-
-#define DRIVER_NAME "imx-mmc"
-
-#define IMXMCI_INT_MASK_DEFAULT (INT_MASK_BUF_READY | INT_MASK_DATA_TRAN | \
- INT_MASK_WRITE_OP_DONE | INT_MASK_END_CMD_RES | \
- INT_MASK_AUTO_CARD_DETECT | INT_MASK_DAT0_EN | INT_MASK_SDIO)
-
-struct imxmci_host {
- struct mmc_host *mmc;
- spinlock_t lock;
- struct resource *res;
- void __iomem *base;
- int irq;
- imx_dmach_t dma;
- volatile unsigned int imask;
- unsigned int power_mode;
- unsigned int present;
- struct imxmmc_platform_data *pdata;
-
- struct mmc_request *req;
- struct mmc_command *cmd;
- struct mmc_data *data;
-
- struct timer_list timer;
- struct tasklet_struct tasklet;
- unsigned int status_reg;
- unsigned long pending_events;
- /* Next two fields are there for CPU driven transfers to overcome SDHC deficiencies */
- u16 *data_ptr;
- unsigned int data_cnt;
- atomic_t stuck_timeout;
-
- unsigned int dma_nents;
- unsigned int dma_size;
- unsigned int dma_dir;
- int dma_allocated;
-
- unsigned char actual_bus_width;
-
- int prev_cmd_code;
-
- struct clk *clk;
-};
-
-#define IMXMCI_PEND_IRQ_b 0
-#define IMXMCI_PEND_DMA_END_b 1
-#define IMXMCI_PEND_DMA_ERR_b 2
-#define IMXMCI_PEND_WAIT_RESP_b 3
-#define IMXMCI_PEND_DMA_DATA_b 4
-#define IMXMCI_PEND_CPU_DATA_b 5
-#define IMXMCI_PEND_CARD_XCHG_b 6
-#define IMXMCI_PEND_SET_INIT_b 7
-#define IMXMCI_PEND_STARTED_b 8
-
-#define IMXMCI_PEND_IRQ_m (1 << IMXMCI_PEND_IRQ_b)
-#define IMXMCI_PEND_DMA_END_m (1 << IMXMCI_PEND_DMA_END_b)
-#define IMXMCI_PEND_DMA_ERR_m (1 << IMXMCI_PEND_DMA_ERR_b)
-#define IMXMCI_PEND_WAIT_RESP_m (1 << IMXMCI_PEND_WAIT_RESP_b)
-#define IMXMCI_PEND_DMA_DATA_m (1 << IMXMCI_PEND_DMA_DATA_b)
-#define IMXMCI_PEND_CPU_DATA_m (1 << IMXMCI_PEND_CPU_DATA_b)
-#define IMXMCI_PEND_CARD_XCHG_m (1 << IMXMCI_PEND_CARD_XCHG_b)
-#define IMXMCI_PEND_SET_INIT_m (1 << IMXMCI_PEND_SET_INIT_b)
-#define IMXMCI_PEND_STARTED_m (1 << IMXMCI_PEND_STARTED_b)
-
-static void imxmci_stop_clock(struct imxmci_host *host)
-{
- int i = 0;
- u16 reg;
-
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg & ~STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
- while (i < 0x1000) {
- if (!(i & 0x7f)) {
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg | STR_STP_CLK_STOP_CLK,
- host->base + MMC_REG_STR_STP_CLK);
- }
-
- reg = readw(host->base + MMC_REG_STATUS);
- if (!(reg & STATUS_CARD_BUS_CLK_RUN)) {
- /* Check twice before cut */
- reg = readw(host->base + MMC_REG_STATUS);
- if (!(reg & STATUS_CARD_BUS_CLK_RUN))
- return;
- }
-
- i++;
- }
- dev_dbg(mmc_dev(host->mmc), "imxmci_stop_clock blocked, no luck\n");
-}
-
-static int imxmci_start_clock(struct imxmci_host *host)
-{
- unsigned int trials = 0;
- unsigned int delay_limit = 128;
- unsigned long flags;
- u16 reg;
-
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg & ~STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK);
-
- clear_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
-
- /*
- * Command start of the clock, this usually succeeds in less
- * then 6 delay loops, but during card detection (low clockrate)
- * it takes up to 5000 delay loops and sometimes fails for the first time
- */
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg | STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK);
-
- do {
- unsigned int delay = delay_limit;
-
- while (delay--) {
- reg = readw(host->base + MMC_REG_STATUS);
- if (reg & STATUS_CARD_BUS_CLK_RUN) {
- /* Check twice before cut */
- reg = readw(host->base + MMC_REG_STATUS);
- if (reg & STATUS_CARD_BUS_CLK_RUN)
- return 0;
- }
-
- if (test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events))
- return 0;
- }
-
- local_irq_save(flags);
- /*
- * Ensure, that request is not doubled under all possible circumstances.
- * It is possible, that cock running state is missed, because some other
- * IRQ or schedule delays this function execution and the clocks has
- * been already stopped by other means (response processing, SDHC HW)
- */
- if (!test_bit(IMXMCI_PEND_STARTED_b, &host->pending_events)) {
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg | STR_STP_CLK_START_CLK,
- host->base + MMC_REG_STR_STP_CLK);
- }
- local_irq_restore(flags);
-
- } while (++trials < 256);
-
- dev_err(mmc_dev(host->mmc), "imxmci_start_clock blocked, no luck\n");
-
- return -1;
-}
-
-static void imxmci_softreset(struct imxmci_host *host)
-{
- int i;
-
- /* reset sequence */
- writew(0x08, host->base + MMC_REG_STR_STP_CLK);
- writew(0x0D, host->base + MMC_REG_STR_STP_CLK);
-
- for (i = 0; i < 8; i++)
- writew(0x05, host->base + MMC_REG_STR_STP_CLK);
-
- writew(0xff, host->base + MMC_REG_RES_TO);
- writew(512, host->base + MMC_REG_BLK_LEN);
- writew(1, host->base + MMC_REG_NOB);
-}
-
-static int imxmci_busy_wait_for_status(struct imxmci_host *host,
- unsigned int *pstat, unsigned int stat_mask,
- int timeout, const char *where)
-{
- int loops = 0;
-
- while (!(*pstat & stat_mask)) {
- loops += 2;
- if (loops >= timeout) {
- dev_dbg(mmc_dev(host->mmc), "busy wait timeout in %s, STATUS = 0x%x (0x%x)\n",
- where, *pstat, stat_mask);
- return -1;
- }
- udelay(2);
- *pstat |= readw(host->base + MMC_REG_STATUS);
- }
- if (!loops)
- return 0;
-
- /* The busy-wait is expected there for clock <8MHz due to SDHC hardware flaws */
- if (!(stat_mask & STATUS_END_CMD_RESP) || (host->mmc->ios.clock >= 8000000))
- dev_info(mmc_dev(host->mmc), "busy wait for %d usec in %s, STATUS = 0x%x (0x%x)\n",
- loops, where, *pstat, stat_mask);
- return loops;
-}
-
-static void imxmci_setup_data(struct imxmci_host *host, struct mmc_data *data)
-{
- unsigned int nob = data->blocks;
- unsigned int blksz = data->blksz;
- unsigned int datasz = nob * blksz;
- int i;
-
- if (data->flags & MMC_DATA_STREAM)
- nob = 0xffff;
-
- host->data = data;
- data->bytes_xfered = 0;
-
- writew(nob, host->base + MMC_REG_NOB);
- writew(blksz, host->base + MMC_REG_BLK_LEN);
-
- /*
- * DMA cannot be used for small block sizes, we have to use CPU driven transfers otherwise.
- * We are in big troubles for non-512 byte transfers according to note in the paragraph
- * 20.6.7 of User Manual anyway, but we need to be able to transfer SCR at least.
- * The situation is even more complex in reality. The SDHC in not able to handle wll
- * partial FIFO fills and reads. The length has to be rounded up to burst size multiple.
- * This is required for SCR read at least.
- */
- if (datasz < 512) {
- host->dma_size = datasz;
- if (data->flags & MMC_DATA_READ) {
- host->dma_dir = DMA_FROM_DEVICE;
-
- /* Hack to enable read SCR */
- writew(1, host->base + MMC_REG_NOB);
- writew(512, host->base + MMC_REG_BLK_LEN);
- } else {
- host->dma_dir = DMA_TO_DEVICE;
- }
-
- /* Convert back to virtual address */
- host->data_ptr = (u16 *)sg_virt(data->sg);
- host->data_cnt = 0;
-
- clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
- set_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
-
- return;
- }
-
- if (data->flags & MMC_DATA_READ) {
- host->dma_dir = DMA_FROM_DEVICE;
- host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
- data->sg_len, host->dma_dir);
-
- imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
- host->res->start + MMC_REG_BUFFER_ACCESS,
- DMA_MODE_READ);
-
- /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_READ, IMX_DMA_WIDTH_16, CCR_REN);*/
- CCR(host->dma) = CCR_DMOD_LINEAR | CCR_DSIZ_32 | CCR_SMOD_FIFO | CCR_SSIZ_16 | CCR_REN;
- } else {
- host->dma_dir = DMA_TO_DEVICE;
-
- host->dma_nents = dma_map_sg(mmc_dev(host->mmc), data->sg,
- data->sg_len, host->dma_dir);
-
- imx_dma_setup_sg(host->dma, data->sg, data->sg_len, datasz,
- host->res->start + MMC_REG_BUFFER_ACCESS,
- DMA_MODE_WRITE);
-
- /*imx_dma_setup_mem2dev_ccr(host->dma, DMA_MODE_WRITE, IMX_DMA_WIDTH_16, CCR_REN);*/
- CCR(host->dma) = CCR_SMOD_LINEAR | CCR_SSIZ_32 | CCR_DMOD_FIFO | CCR_DSIZ_16 | CCR_REN;
- }
-
-#if 1 /* This code is there only for consistency checking and can be disabled in future */
- host->dma_size = 0;
- for (i = 0; i < host->dma_nents; i++)
- host->dma_size += data->sg[i].length;
-
- if (datasz > host->dma_size) {
- dev_err(mmc_dev(host->mmc), "imxmci_setup_data datasz 0x%x > 0x%x dm_size\n",
- datasz, host->dma_size);
- }
-#endif
-
- host->dma_size = datasz;
-
- wmb();
-
- set_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events);
- clear_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events);
-
- /* start DMA engine for read, write is delayed after initial response */
- if (host->dma_dir == DMA_FROM_DEVICE)
- imx_dma_enable(host->dma);
-}
-
-static void imxmci_start_cmd(struct imxmci_host *host, struct mmc_command *cmd, unsigned int cmdat)
-{
- unsigned long flags;
- u32 imask;
-
- WARN_ON(host->cmd != NULL);
- host->cmd = cmd;
-
- /* Ensure, that clock are stopped else command programming and start fails */
- imxmci_stop_clock(host);
-
- if (cmd->flags & MMC_RSP_BUSY)
- cmdat |= CMD_DAT_CONT_BUSY;
-
- switch (mmc_resp_type(cmd)) {
- case MMC_RSP_R1: /* short CRC, OPCODE */
- case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */
- cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R1;
- break;
- case MMC_RSP_R2: /* long 136 bit + CRC */
- cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R2;
- break;
- case MMC_RSP_R3: /* short */
- cmdat |= CMD_DAT_CONT_RESPONSE_FORMAT_R3;
- break;
- default:
- break;
- }
-
- if (test_and_clear_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events))
- cmdat |= CMD_DAT_CONT_INIT; /* This command needs init */
-
- if (host->actual_bus_width == MMC_BUS_WIDTH_4)
- cmdat |= CMD_DAT_CONT_BUS_WIDTH_4;
-
- writew(cmd->opcode, host->base + MMC_REG_CMD);
- writew(cmd->arg >> 16, host->base + MMC_REG_ARGH);
- writew(cmd->arg & 0xffff, host->base + MMC_REG_ARGL);
- writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT);
-
- atomic_set(&host->stuck_timeout, 0);
- set_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events);
-
-
- imask = IMXMCI_INT_MASK_DEFAULT;
- imask &= ~INT_MASK_END_CMD_RES;
- if (cmdat & CMD_DAT_CONT_DATA_ENABLE) {
- /* imask &= ~INT_MASK_BUF_READY; */
- imask &= ~INT_MASK_DATA_TRAN;
- if (cmdat & CMD_DAT_CONT_WRITE)
- imask &= ~INT_MASK_WRITE_OP_DONE;
- if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
- imask &= ~INT_MASK_BUF_READY;
- }
-
- spin_lock_irqsave(&host->lock, flags);
- host->imask = imask;
- writew(host->imask, host->base + MMC_REG_INT_MASK);
- spin_unlock_irqrestore(&host->lock, flags);
-
- dev_dbg(mmc_dev(host->mmc), "CMD%02d (0x%02x) mask set to 0x%04x\n",
- cmd->opcode, cmd->opcode, imask);
-
- imxmci_start_clock(host);
-}
-
-static void imxmci_finish_request(struct imxmci_host *host, struct mmc_request *req)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&host->lock, flags);
-
- host->pending_events &= ~(IMXMCI_PEND_WAIT_RESP_m | IMXMCI_PEND_DMA_END_m |
- IMXMCI_PEND_DMA_DATA_m | IMXMCI_PEND_CPU_DATA_m);
-
- host->imask = IMXMCI_INT_MASK_DEFAULT;
- writew(host->imask, host->base + MMC_REG_INT_MASK);
-
- spin_unlock_irqrestore(&host->lock, flags);
-
- if (req && req->cmd)
- host->prev_cmd_code = req->cmd->opcode;
-
- host->req = NULL;
- host->cmd = NULL;
- host->data = NULL;
- mmc_request_done(host->mmc, req);
-}
-
-static int imxmci_finish_data(struct imxmci_host *host, unsigned int stat)
-{
- struct mmc_data *data = host->data;
- int data_error;
-
- if (test_and_clear_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
- imx_dma_disable(host->dma);
- dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_nents,
- host->dma_dir);
- }
-
- if (stat & STATUS_ERR_MASK) {
- dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", stat);
- if (stat & (STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR))
- data->error = -EILSEQ;
- else if (stat & STATUS_TIME_OUT_READ)
- data->error = -ETIMEDOUT;
- else
- data->error = -EIO;
- } else {
- data->bytes_xfered = host->dma_size;
- }
-
- data_error = data->error;
-
- host->data = NULL;
-
- return data_error;
-}
-
-static int imxmci_cmd_done(struct imxmci_host *host, unsigned int stat)
-{
- struct mmc_command *cmd = host->cmd;
- int i;
- u32 a, b, c;
- struct mmc_data *data = host->data;
-
- if (!cmd)
- return 0;
-
- host->cmd = NULL;
-
- if (stat & STATUS_TIME_OUT_RESP) {
- dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n");
- cmd->error = -ETIMEDOUT;
- } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
- dev_dbg(mmc_dev(host->mmc), "cmd crc error\n");
- cmd->error = -EILSEQ;
- }
-
- if (cmd->flags & MMC_RSP_PRESENT) {
- if (cmd->flags & MMC_RSP_136) {
- for (i = 0; i < 4; i++) {
- a = readw(host->base + MMC_REG_RES_FIFO);
- b = readw(host->base + MMC_REG_RES_FIFO);
- cmd->resp[i] = a << 16 | b;
- }
- } else {
- a = readw(host->base + MMC_REG_RES_FIFO);
- b = readw(host->base + MMC_REG_RES_FIFO);
- c = readw(host->base + MMC_REG_RES_FIFO);
- cmd->resp[0] = a << 24 | b << 8 | c >> 8;
- }
- }
-
- dev_dbg(mmc_dev(host->mmc), "RESP 0x%08x, 0x%08x, 0x%08x, 0x%08x, error %d\n",
- cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3], cmd->error);
-
- if (data && !cmd->error && !(stat & STATUS_ERR_MASK)) {
- if (host->req->data->flags & MMC_DATA_WRITE) {
-
- /* Wait for FIFO to be empty before starting DMA write */
-
- stat = readw(host->base + MMC_REG_STATUS);
- if (imxmci_busy_wait_for_status(host, &stat,
- STATUS_APPL_BUFF_FE,
- 40, "imxmci_cmd_done DMA WR") < 0) {
- cmd->error = -EIO;
- imxmci_finish_data(host, stat);
- if (host->req)
- imxmci_finish_request(host, host->req);
- dev_warn(mmc_dev(host->mmc), "STATUS = 0x%04x\n",
- stat);
- return 0;
- }
-
- if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
- imx_dma_enable(host->dma);
- }
- } else {
- struct mmc_request *req;
- imxmci_stop_clock(host);
- req = host->req;
-
- if (data)
- imxmci_finish_data(host, stat);
-
- if (req)
- imxmci_finish_request(host, req);
- else
- dev_warn(mmc_dev(host->mmc), "imxmci_cmd_done: no request to finish\n");
- }
-
- return 1;
-}
-
-static int imxmci_data_done(struct imxmci_host *host, unsigned int stat)
-{
- struct mmc_data *data = host->data;
- int data_error;
-
- if (!data)
- return 0;
-
- data_error = imxmci_finish_data(host, stat);
-
- if (host->req->stop) {
- imxmci_stop_clock(host);
- imxmci_start_cmd(host, host->req->stop, 0);
- } else {
- struct mmc_request *req;
- req = host->req;
- if (req)
- imxmci_finish_request(host, req);
- else
- dev_warn(mmc_dev(host->mmc), "imxmci_data_done: no request to finish\n");
- }
-
- return 1;
-}
-
-static int imxmci_cpu_driven_data(struct imxmci_host *host, unsigned int *pstat)
-{
- int i;
- int burst_len;
- int trans_done = 0;
- unsigned int stat = *pstat;
-
- if (host->actual_bus_width != MMC_BUS_WIDTH_4)
- burst_len = 16;
- else
- burst_len = 64;
-
- /* This is unfortunately required */
- dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data running STATUS = 0x%x\n",
- stat);
-
- udelay(20); /* required for clocks < 8MHz*/
-
- if (host->dma_dir == DMA_FROM_DEVICE) {
- imxmci_busy_wait_for_status(host, &stat,
- STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE |
- STATUS_TIME_OUT_READ,
- 50, "imxmci_cpu_driven_data read");
-
- while ((stat & (STATUS_APPL_BUFF_FF | STATUS_DATA_TRANS_DONE)) &&
- !(stat & STATUS_TIME_OUT_READ) &&
- (host->data_cnt < 512)) {
-
- udelay(20); /* required for clocks < 8MHz*/
-
- for (i = burst_len; i >= 2 ; i -= 2) {
- u16 data;
- data = readw(host->base + MMC_REG_BUFFER_ACCESS);
- udelay(10); /* required for clocks < 8MHz*/
- if (host->data_cnt+2 <= host->dma_size) {
- *(host->data_ptr++) = data;
- } else {
- if (host->data_cnt < host->dma_size)
- *(u8 *)(host->data_ptr) = data;
- }
- host->data_cnt += 2;
- }
-
- stat = readw(host->base + MMC_REG_STATUS);
-
- dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read %d burst %d STATUS = 0x%x\n",
- host->data_cnt, burst_len, stat);
- }
-
- if ((stat & STATUS_DATA_TRANS_DONE) && (host->data_cnt >= 512))
- trans_done = 1;
-
- if (host->dma_size & 0x1ff)
- stat &= ~STATUS_CRC_READ_ERR;
-
- if (stat & STATUS_TIME_OUT_READ) {
- dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data read timeout STATUS = 0x%x\n",
- stat);
- trans_done = -1;
- }
-
- } else {
- imxmci_busy_wait_for_status(host, &stat,
- STATUS_APPL_BUFF_FE,
- 20, "imxmci_cpu_driven_data write");
-
- while ((stat & STATUS_APPL_BUFF_FE) &&
- (host->data_cnt < host->dma_size)) {
- if (burst_len >= host->dma_size - host->data_cnt) {
- burst_len = host->dma_size - host->data_cnt;
- host->data_cnt = host->dma_size;
- trans_done = 1;
- } else {
- host->data_cnt += burst_len;
- }
-
- for (i = burst_len; i > 0 ; i -= 2)
- writew(*(host->data_ptr++), host->base + MMC_REG_BUFFER_ACCESS);
-
- stat = readw(host->base + MMC_REG_STATUS);
-
- dev_dbg(mmc_dev(host->mmc), "imxmci_cpu_driven_data write burst %d STATUS = 0x%x\n",
- burst_len, stat);
- }
- }
-
- *pstat = stat;
-
- return trans_done;
-}
-
-static void imxmci_dma_irq(int dma, void *devid)
-{
- struct imxmci_host *host = devid;
- u32 stat = readw(host->base + MMC_REG_STATUS);
-
- atomic_set(&host->stuck_timeout, 0);
- host->status_reg = stat;
- set_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
- tasklet_schedule(&host->tasklet);
-}
-
-static irqreturn_t imxmci_irq(int irq, void *devid)
-{
- struct imxmci_host *host = devid;
- u32 stat = readw(host->base + MMC_REG_STATUS);
- int handled = 1;
-
- writew(host->imask | INT_MASK_SDIO | INT_MASK_AUTO_CARD_DETECT,
- host->base + MMC_REG_INT_MASK);
-
- atomic_set(&host->stuck_timeout, 0);
- host->status_reg = stat;
- set_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
- set_bit(IMXMCI_PEND_STARTED_b, &host->pending_events);
- tasklet_schedule(&host->tasklet);
-
- return IRQ_RETVAL(handled);
-}
-
-static void imxmci_tasklet_fnc(unsigned long data)
-{
- struct imxmci_host *host = (struct imxmci_host *)data;
- u32 stat;
- unsigned int data_dir_mask = 0; /* STATUS_WR_CRC_ERROR_CODE_MASK */
- int timeout = 0;
-
- if (atomic_read(&host->stuck_timeout) > 4) {
- char *what;
- timeout = 1;
- stat = readw(host->base + MMC_REG_STATUS);
- host->status_reg = stat;
- if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
- if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
- what = "RESP+DMA";
- else
- what = "RESP";
- else
- if (test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events))
- if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events))
- what = "DATA";
- else
- what = "DMA";
- else
- what = "???";
-
- dev_err(mmc_dev(host->mmc),
- "%s TIMEOUT, hardware stucked STATUS = 0x%04x IMASK = 0x%04x\n",
- what, stat,
- readw(host->base + MMC_REG_INT_MASK));
- dev_err(mmc_dev(host->mmc),
- "CMD_DAT_CONT = 0x%04x, MMC_BLK_LEN = 0x%04x, MMC_NOB = 0x%04x, DMA_CCR = 0x%08x\n",
- readw(host->base + MMC_REG_CMD_DAT_CONT),
- readw(host->base + MMC_REG_BLK_LEN),
- readw(host->base + MMC_REG_NOB),
- CCR(host->dma));
- dev_err(mmc_dev(host->mmc), "CMD%d, prevCMD%d, bus %d-bit, dma_size = 0x%x\n",
- host->cmd ? host->cmd->opcode : 0,
- host->prev_cmd_code,
- 1 << host->actual_bus_width, host->dma_size);
- }
-
- if (!host->present || timeout)
- host->status_reg = STATUS_TIME_OUT_RESP | STATUS_TIME_OUT_READ |
- STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR;
-
- if (test_bit(IMXMCI_PEND_IRQ_b, &host->pending_events) || timeout) {
- clear_bit(IMXMCI_PEND_IRQ_b, &host->pending_events);
-
- stat = readw(host->base + MMC_REG_STATUS);
- /*
- * This is not required in theory, but there is chance to miss some flag
- * which clears automatically by mask write, FreeScale original code keeps
- * stat from IRQ time so do I
- */
- stat |= host->status_reg;
-
- if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events))
- stat &= ~STATUS_CRC_READ_ERR;
-
- if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
- imxmci_busy_wait_for_status(host, &stat,
- STATUS_END_CMD_RESP | STATUS_ERR_MASK,
- 20, "imxmci_tasklet_fnc resp (ERRATUM #4)");
- }
-
- if (stat & (STATUS_END_CMD_RESP | STATUS_ERR_MASK)) {
- if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
- imxmci_cmd_done(host, stat);
- if (host->data && (stat & STATUS_ERR_MASK))
- imxmci_data_done(host, stat);
- }
-
- if (test_bit(IMXMCI_PEND_CPU_DATA_b, &host->pending_events)) {
- stat |= readw(host->base + MMC_REG_STATUS);
- if (imxmci_cpu_driven_data(host, &stat)) {
- if (test_and_clear_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events))
- imxmci_cmd_done(host, stat);
- atomic_clear_mask(IMXMCI_PEND_IRQ_m|IMXMCI_PEND_CPU_DATA_m,
- &host->pending_events);
- imxmci_data_done(host, stat);
- }
- }
- }
-
- if (test_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events) &&
- !test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events)) {
-
- stat = readw(host->base + MMC_REG_STATUS);
- /* Same as above */
- stat |= host->status_reg;
-
- if (host->dma_dir == DMA_TO_DEVICE)
- data_dir_mask = STATUS_WRITE_OP_DONE;
- else
- data_dir_mask = STATUS_DATA_TRANS_DONE;
-
- if (stat & data_dir_mask) {
- clear_bit(IMXMCI_PEND_DMA_END_b, &host->pending_events);
- imxmci_data_done(host, stat);
- }
- }
-
- if (test_and_clear_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events)) {
-
- if (host->cmd)
- imxmci_cmd_done(host, STATUS_TIME_OUT_RESP);
-
- if (host->data)
- imxmci_data_done(host, STATUS_TIME_OUT_READ |
- STATUS_CRC_READ_ERR | STATUS_CRC_WRITE_ERR);
-
- if (host->req)
- imxmci_finish_request(host, host->req);
-
- mmc_detect_change(host->mmc, msecs_to_jiffies(100));
-
- }
-}
-
-static void imxmci_request(struct mmc_host *mmc, struct mmc_request *req)
-{
- struct imxmci_host *host = mmc_priv(mmc);
- unsigned int cmdat;
-
- WARN_ON(host->req != NULL);
-
- host->req = req;
-
- cmdat = 0;
-
- if (req->data) {
- imxmci_setup_data(host, req->data);
-
- cmdat |= CMD_DAT_CONT_DATA_ENABLE;
-
- if (req->data->flags & MMC_DATA_WRITE)
- cmdat |= CMD_DAT_CONT_WRITE;
-
- if (req->data->flags & MMC_DATA_STREAM)
- cmdat |= CMD_DAT_CONT_STREAM_BLOCK;
- }
-
- imxmci_start_cmd(host, req->cmd, cmdat);
-}
-
-#define CLK_RATE 19200000
-
-static void imxmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-{
- struct imxmci_host *host = mmc_priv(mmc);
- int prescaler;
-
- if (ios->bus_width == MMC_BUS_WIDTH_4) {
- host->actual_bus_width = MMC_BUS_WIDTH_4;
- imx_gpio_mode(PB11_PF_SD_DAT3);
- BLR(host->dma) = 0; /* burst 64 byte read/write */
- } else {
- host->actual_bus_width = MMC_BUS_WIDTH_1;
- imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
- BLR(host->dma) = 16; /* burst 16 byte read/write */
- }
-
- if (host->power_mode != ios->power_mode) {
- switch (ios->power_mode) {
- case MMC_POWER_OFF:
- break;
- case MMC_POWER_UP:
- set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
- break;
- case MMC_POWER_ON:
- break;
- }
- host->power_mode = ios->power_mode;
- }
-
- if (ios->clock) {
- unsigned int clk;
- u16 reg;
-
- /* The prescaler is 5 for PERCLK2 equal to 96MHz
- * then 96MHz / 5 = 19.2 MHz
- */
- clk = clk_get_rate(host->clk);
- prescaler = (clk + (CLK_RATE * 7) / 8) / CLK_RATE;
- switch (prescaler) {
- case 0:
- case 1: prescaler = 0;
- break;
- case 2: prescaler = 1;
- break;
- case 3: prescaler = 2;
- break;
- case 4: prescaler = 4;
- break;
- default:
- case 5: prescaler = 5;
- break;
- }
-
- dev_dbg(mmc_dev(host->mmc), "PERCLK2 %d MHz -> prescaler %d\n",
- clk, prescaler);
-
- for (clk = 0; clk < 8; clk++) {
- int x;
- x = CLK_RATE / (1 << clk);
- if (x <= ios->clock)
- break;
- }
-
- /* enable controller */
- reg = readw(host->base + MMC_REG_STR_STP_CLK);
- writew(reg | STR_STP_CLK_ENABLE,
- host->base + MMC_REG_STR_STP_CLK);
-
- imxmci_stop_clock(host);
- writew((prescaler << 3) | clk, host->base + MMC_REG_CLK_RATE);
- /*
- * Under my understanding, clock should not be started there, because it would
- * initiate SDHC sequencer and send last or random command into card
- */
- /* imxmci_start_clock(host); */
-
- dev_dbg(mmc_dev(host->mmc),
- "MMC_CLK_RATE: 0x%08x\n",
- readw(host->base + MMC_REG_CLK_RATE));
- } else {
- imxmci_stop_clock(host);
- }
-}
-
-static int imxmci_get_ro(struct mmc_host *mmc)
-{
- struct imxmci_host *host = mmc_priv(mmc);
-
- if (host->pdata && host->pdata->get_ro)
- return !!host->pdata->get_ro(mmc_dev(mmc));
- /*
- * Board doesn't support read only detection; let the mmc core
- * decide what to do.
- */
- return -ENOSYS;
-}
-
-
-static const struct mmc_host_ops imxmci_ops = {
- .request = imxmci_request,
- .set_ios = imxmci_set_ios,
- .get_ro = imxmci_get_ro,
-};
-
-static void imxmci_check_status(unsigned long data)
-{
- struct imxmci_host *host = (struct imxmci_host *)data;
-
- if (host->pdata && host->pdata->card_present &&
- host->pdata->card_present(mmc_dev(host->mmc)) != host->present) {
- host->present ^= 1;
- dev_info(mmc_dev(host->mmc), "card %s\n",
- host->present ? "inserted" : "removed");
-
- set_bit(IMXMCI_PEND_CARD_XCHG_b, &host->pending_events);
- tasklet_schedule(&host->tasklet);
- }
-
- if (test_bit(IMXMCI_PEND_WAIT_RESP_b, &host->pending_events) ||
- test_bit(IMXMCI_PEND_DMA_DATA_b, &host->pending_events)) {
- atomic_inc(&host->stuck_timeout);
- if (atomic_read(&host->stuck_timeout) > 4)
- tasklet_schedule(&host->tasklet);
- } else {
- atomic_set(&host->stuck_timeout, 0);
-
- }
-
- mod_timer(&host->timer, jiffies + (HZ>>1));
-}
-
-static int __init imxmci_probe(struct platform_device *pdev)
-{
- struct mmc_host *mmc;
- struct imxmci_host *host = NULL;
- struct resource *r;
- int ret = 0, irq;
- u16 rev_no;
-
- pr_info("i.MX mmc driver\n");
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- irq = platform_get_irq(pdev, 0);
- if (!r || irq < 0)
- return -ENXIO;
-
- r = request_mem_region(r->start, resource_size(r), pdev->name);
- if (!r)
- return -EBUSY;
-
- mmc = mmc_alloc_host(sizeof(struct imxmci_host), &pdev->dev);
- if (!mmc) {
- ret = -ENOMEM;
- goto out;
- }
-
- mmc->ops = &imxmci_ops;
- mmc->f_min = 150000;
- mmc->f_max = CLK_RATE/2;
- mmc->ocr_avail = MMC_VDD_32_33;
- mmc->caps = MMC_CAP_4_BIT_DATA;
-
- /* MMC core transfer sizes tunable parameters */
- mmc->max_segs = 64;
- mmc->max_seg_size = 64*512; /* default PAGE_CACHE_SIZE */
- mmc->max_req_size = 64*512; /* default PAGE_CACHE_SIZE */
- mmc->max_blk_size = 2048;
- mmc->max_blk_count = 65535;
-
- host = mmc_priv(mmc);
- host->base = ioremap(r->start, resource_size(r));
- if (!host->base) {
- ret = -ENOMEM;
- goto out;
- }
-
- host->mmc = mmc;
- host->dma_allocated = 0;
- host->pdata = pdev->dev.platform_data;
- if (!host->pdata)
- dev_warn(&pdev->dev, "No platform data provided!\n");
-
- spin_lock_init(&host->lock);
- host->res = r;
- host->irq = irq;
-
- host->clk = clk_get(&pdev->dev, "perclk2");
- if (IS_ERR(host->clk)) {
- ret = PTR_ERR(host->clk);
- goto out;
- }
- clk_enable(host->clk);
-
- imx_gpio_mode(PB8_PF_SD_DAT0);
- imx_gpio_mode(PB9_PF_SD_DAT1);
- imx_gpio_mode(PB10_PF_SD_DAT2);
- /* Configured as GPIO with pull-up to ensure right MCC card mode */
- /* Switched to PB11_PF_SD_DAT3 if 4 bit bus is configured */
- imx_gpio_mode(GPIO_PORTB | GPIO_IN | GPIO_PUEN | 11);
- /* imx_gpio_mode(PB11_PF_SD_DAT3); */
- imx_gpio_mode(PB12_PF_SD_CLK);
- imx_gpio_mode(PB13_PF_SD_CMD);
-
- imxmci_softreset(host);
-
- rev_no = readw(host->base + MMC_REG_REV_NO);
- if (rev_no != 0x390) {
- dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n",
- readw(host->base + MMC_REG_REV_NO));
- goto out;
- }
-
- /* recommended in data sheet */
- writew(0x2db4, host->base + MMC_REG_READ_TO);
-
- host->imask = IMXMCI_INT_MASK_DEFAULT;
- writew(host->imask, host->base + MMC_REG_INT_MASK);
-
- host->dma = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_LOW);
- if(host->dma < 0) {
- dev_err(mmc_dev(host->mmc), "imx_dma_request_by_prio failed\n");
- ret = -EBUSY;
- goto out;
- }
- host->dma_allocated = 1;
- imx_dma_setup_handlers(host->dma, imxmci_dma_irq, NULL, host);
- RSSR(host->dma) = DMA_REQ_SDHC;
-
- tasklet_init(&host->tasklet, imxmci_tasklet_fnc, (unsigned long)host);
- host->status_reg=0;
- host->pending_events=0;
-
- ret = request_irq(host->irq, imxmci_irq, 0, DRIVER_NAME, host);
- if (ret)
- goto out;
-
- if (host->pdata && host->pdata->card_present)
- host->present = host->pdata->card_present(mmc_dev(mmc));
- else /* if there is no way to detect assume that card is present */
- host->present = 1;
-
- init_timer(&host->timer);
- host->timer.data = (unsigned long)host;
- host->timer.function = imxmci_check_status;
- add_timer(&host->timer);
- mod_timer(&host->timer, jiffies + (HZ >> 1));
-
- platform_set_drvdata(pdev, mmc);
-
- mmc_add_host(mmc);
-
- return 0;
-
-out:
- if (host) {
- if (host->dma_allocated) {
- imx_dma_free(host->dma);
- host->dma_allocated = 0;
- }
- if (host->clk) {
- clk_disable(host->clk);
- clk_put(host->clk);
- }
- if (host->base)
- iounmap(host->base);
- }
- if (mmc)
- mmc_free_host(mmc);
- release_mem_region(r->start, resource_size(r));
- return ret;
-}
-
-static int __exit imxmci_remove(struct platform_device *pdev)
-{
- struct mmc_host *mmc = platform_get_drvdata(pdev);
-
- platform_set_drvdata(pdev, NULL);
-
- if (mmc) {
- struct imxmci_host *host = mmc_priv(mmc);
-
- tasklet_disable(&host->tasklet);
-
- del_timer_sync(&host->timer);
- mmc_remove_host(mmc);
-
- free_irq(host->irq, host);
- iounmap(host->base);
- if (host->dma_allocated) {
- imx_dma_free(host->dma);
- host->dma_allocated = 0;
- }
-
- tasklet_kill(&host->tasklet);
-
- clk_disable(host->clk);
- clk_put(host->clk);
-
- release_mem_region(host->res->start, resource_size(host->res));
-
- mmc_free_host(mmc);
- }
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int imxmci_suspend(struct platform_device *dev, pm_message_t state)
-{
- struct mmc_host *mmc = platform_get_drvdata(dev);
- int ret = 0;
-
- if (mmc)
- ret = mmc_suspend_host(mmc);
-
- return ret;
-}
-
-static int imxmci_resume(struct platform_device *dev)
-{
- struct mmc_host *mmc = platform_get_drvdata(dev);
- struct imxmci_host *host;
- int ret = 0;
-
- if (mmc) {
- host = mmc_priv(mmc);
- if (host)
- set_bit(IMXMCI_PEND_SET_INIT_b, &host->pending_events);
- ret = mmc_resume_host(mmc);
- }
-
- return ret;
-}
-#else
-#define imxmci_suspend NULL
-#define imxmci_resume NULL
-#endif /* CONFIG_PM */
-
-static struct platform_driver imxmci_driver = {
- .remove = __exit_p(imxmci_remove),
- .suspend = imxmci_suspend,
- .resume = imxmci_resume,
- .driver = {
- .name = DRIVER_NAME,
- .owner = THIS_MODULE,
- }
-};
-
-static int __init imxmci_init(void)
-{
- return platform_driver_probe(&imxmci_driver, imxmci_probe);
-}
-
-static void __exit imxmci_exit(void)
-{
- platform_driver_unregister(&imxmci_driver);
-}
-
-module_init(imxmci_init);
-module_exit(imxmci_exit);
-
-MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver");
-MODULE_AUTHOR("Sascha Hauer, Pengutronix");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:imx-mmc");
--
1.7.9.5
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