* [PATCH 1/6 v2] mmc: tmio: split core functionality, DMA and MFD glue
2011-03-23 13:42 [PATCH 0/6 v2] mmc: split the tmio driver into several modules Guennadi Liakhovetski
@ 2011-03-23 13:42 ` Guennadi Liakhovetski
2011-03-23 13:42 ` [PATCH 2/6] sh: ecovec: use the CONFIG_MMC_TMIO symbols instead of Guennadi Liakhovetski
` (6 subsequent siblings)
7 siblings, 0 replies; 12+ messages in thread
From: Guennadi Liakhovetski @ 2011-03-23 13:42 UTC (permalink / raw)
To: linux-sh
Cc: linux-mmc, Chris Ball, Ian Molton, Magnus Damm, Samuel Ortiz,
Paul Mundt
TMIO MMC chips contain an SD / SDIO IP core from Panasonic, similar to
the one, used in MN5774 and other MN57xx controllers. These IP cores are
included in many multifunction devices, in sh-mobile chips from Renesas,
in the latter case they can also use DMA. Some sh-mobile implementations
also have some other specialities, that MFD-based solutions don't have.
This makes supporting all these features in a monolithic driver inconveniet
and error-prone. This patch splits the driver into 3 parts: the core,
the MFD glue and the DMA support. In case of a modular build, two modules
will be built: mmc_tmio_core and mmc_tmio.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---
v2: allocate the DMA bounce buffer dynamically, as agreed with Magnus
drivers/mmc/host/Kconfig | 4 +
drivers/mmc/host/Makefile | 3 +
drivers/mmc/host/tmio_mmc.c | 1303 +--------------------------------------
drivers/mmc/host/tmio_mmc.h | 145 +++++
drivers/mmc/host/tmio_mmc_dma.c | 316 ++++++++++
drivers/mmc/host/tmio_mmc_pio.c | 923 +++++++++++++++++++++++++++
6 files changed, 1409 insertions(+), 1285 deletions(-)
create mode 100644 drivers/mmc/host/tmio_mmc.h
create mode 100644 drivers/mmc/host/tmio_mmc_dma.c
create mode 100644 drivers/mmc/host/tmio_mmc_pio.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 1a21c64..4d16166 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -439,9 +439,13 @@ config MMC_SDRICOH_CS
To compile this driver as a module, choose M here: the
module will be called sdricoh_cs.
+config MMC_TMIO_CORE
+ tristate
+
config MMC_TMIO
tristate "Toshiba Mobile IO Controller (TMIO) MMC/SD function support"
depends on MFD_TMIO || MFD_ASIC3 || MFD_SH_MOBILE_SDHI
+ select MMC_TMIO_CORE
help
This provides support for the SD/MMC cell found in TC6393XB,
T7L66XB and also HTC ASIC3
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 30aa686..79c42dd 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -29,6 +29,9 @@ endif
obj-$(CONFIG_MMC_S3C) += s3cmci.o
obj-$(CONFIG_MMC_SDRICOH_CS) += sdricoh_cs.o
obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
+obj-$(CONFIG_MMC_TMIO_CORE) += tmio_mmc_core.o
+tmio_mmc_core-y := tmio_mmc_pio.o
+tmio_mmc_core-$(CONFIG_TMIO_MMC_DMA) += tmio_mmc_dma.o
obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc.o
obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 32ab145..79c5684 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -1,8 +1,8 @@
/*
- * linux/drivers/mmc/tmio_mmc.c
+ * linux/drivers/mmc/host/tmio_mmc.c
*
- * Copyright (C) 2004 Ian Molton
- * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
*
* 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
@@ -11,1200 +11,17 @@
* Driver for the MMC / SD / SDIO cell found in:
*
* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
- *
- * This driver draws mainly on scattered spec sheets, Reverse engineering
- * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
- * support). (Further 4 bit support from a later datasheet).
- *
- * TODO:
- * Investigate using a workqueue for PIO transfers
- * Eliminate FIXMEs
- * SDIO support
- * Better Power management
- * Handle MMC errors better
- * double buffer support
- *
*/
-#include <linux/delay.h>
#include <linux/device.h>
-#include <linux/dmaengine.h>
-#include <linux/highmem.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>
-#include <linux/workqueue.h>
-#include <linux/spinlock.h>
-
-#define CTL_SD_CMD 0x00
-#define CTL_ARG_REG 0x04
-#define CTL_STOP_INTERNAL_ACTION 0x08
-#define CTL_XFER_BLK_COUNT 0xa
-#define CTL_RESPONSE 0x0c
-#define CTL_STATUS 0x1c
-#define CTL_IRQ_MASK 0x20
-#define CTL_SD_CARD_CLK_CTL 0x24
-#define CTL_SD_XFER_LEN 0x26
-#define CTL_SD_MEM_CARD_OPT 0x28
-#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
-#define CTL_SD_DATA_PORT 0x30
-#define CTL_TRANSACTION_CTL 0x34
-#define CTL_SDIO_STATUS 0x36
-#define CTL_SDIO_IRQ_MASK 0x38
-#define CTL_RESET_SD 0xe0
-#define CTL_SDIO_REGS 0x100
-#define CTL_CLK_AND_WAIT_CTL 0x138
-#define CTL_RESET_SDIO 0x1e0
-
-/* Definitions for values the CTRL_STATUS register can take. */
-#define TMIO_STAT_CMDRESPEND 0x00000001
-#define TMIO_STAT_DATAEND 0x00000004
-#define TMIO_STAT_CARD_REMOVE 0x00000008
-#define TMIO_STAT_CARD_INSERT 0x00000010
-#define TMIO_STAT_SIGSTATE 0x00000020
-#define TMIO_STAT_WRPROTECT 0x00000080
-#define TMIO_STAT_CARD_REMOVE_A 0x00000100
-#define TMIO_STAT_CARD_INSERT_A 0x00000200
-#define TMIO_STAT_SIGSTATE_A 0x00000400
-#define TMIO_STAT_CMD_IDX_ERR 0x00010000
-#define TMIO_STAT_CRCFAIL 0x00020000
-#define TMIO_STAT_STOPBIT_ERR 0x00040000
-#define TMIO_STAT_DATATIMEOUT 0x00080000
-#define TMIO_STAT_RXOVERFLOW 0x00100000
-#define TMIO_STAT_TXUNDERRUN 0x00200000
-#define TMIO_STAT_CMDTIMEOUT 0x00400000
-#define TMIO_STAT_RXRDY 0x01000000
-#define TMIO_STAT_TXRQ 0x02000000
-#define TMIO_STAT_ILL_FUNC 0x20000000
-#define TMIO_STAT_CMD_BUSY 0x40000000
-#define TMIO_STAT_ILL_ACCESS 0x80000000
-
-/* Definitions for values the CTRL_SDIO_STATUS register can take. */
-#define TMIO_SDIO_STAT_IOIRQ 0x0001
-#define TMIO_SDIO_STAT_EXPUB52 0x4000
-#define TMIO_SDIO_STAT_EXWT 0x8000
-#define TMIO_SDIO_MASK_ALL 0xc007
-
-/* Define some IRQ masks */
-/* This is the mask used at reset by the chip */
-#define TMIO_MASK_ALL 0x837f031d
-#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
-#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
-#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
- TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
-#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
-
-#define TMIO_MIN_DMA_LEN 8
-
-#define enable_mmc_irqs(host, i) \
- do { \
- u32 mask;\
- mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
- mask &= ~((i) & TMIO_MASK_IRQ); \
- sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
- } while (0)
-
-#define disable_mmc_irqs(host, i) \
- do { \
- u32 mask;\
- mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \
- mask |= ((i) & TMIO_MASK_IRQ); \
- sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \
- } while (0)
-
-#define ack_mmc_irqs(host, i) \
- do { \
- sd_ctrl_write32((host), CTL_STATUS, ~(i)); \
- } while (0)
-
-/* This is arbitrary, just noone needed any higher alignment yet */
-#define MAX_ALIGN 4
-
-struct tmio_mmc_host {
- void __iomem *ctl;
- unsigned long bus_shift;
- struct mmc_command *cmd;
- struct mmc_request *mrq;
- struct mmc_data *data;
- struct mmc_host *mmc;
- int irq;
- unsigned int sdio_irq_enabled;
-
- /* Callbacks for clock / power control */
- void (*set_pwr)(struct platform_device *host, int state);
- void (*set_clk_div)(struct platform_device *host, int state);
-
- /* pio related stuff */
- struct scatterlist *sg_ptr;
- struct scatterlist *sg_orig;
- unsigned int sg_len;
- unsigned int sg_off;
-
- struct platform_device *pdev;
-
- /* DMA support */
- bool force_pio;
- struct dma_chan *chan_rx;
- struct dma_chan *chan_tx;
- struct tasklet_struct dma_complete;
- struct tasklet_struct dma_issue;
-#ifdef CONFIG_TMIO_MMC_DMA
- u8 bounce_buf[PAGE_CACHE_SIZE] __attribute__((aligned(MAX_ALIGN)));
- struct scatterlist bounce_sg;
-#endif
-
- /* Track lost interrupts */
- struct delayed_work delayed_reset_work;
- spinlock_t lock;
- unsigned long last_req_ts;
-};
-
-static void tmio_check_bounce_buffer(struct tmio_mmc_host *host);
-
-static u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
-{
- return readw(host->ctl + (addr << host->bus_shift));
-}
-
-static void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
- u16 *buf, int count)
-{
- readsw(host->ctl + (addr << host->bus_shift), buf, count);
-}
-
-static u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
-{
- return readw(host->ctl + (addr << host->bus_shift)) |
- readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
-}
-
-static void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
-{
- writew(val, host->ctl + (addr << host->bus_shift));
-}
-
-static void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
- u16 *buf, int count)
-{
- writesw(host->ctl + (addr << host->bus_shift), buf, count);
-}
-
-static void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
-{
- writew(val, host->ctl + (addr << host->bus_shift));
- writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
-}
-
-static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
-{
- host->sg_len = data->sg_len;
- host->sg_ptr = data->sg;
- host->sg_orig = data->sg;
- host->sg_off = 0;
-}
-
-static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
-{
- host->sg_ptr = sg_next(host->sg_ptr);
- host->sg_off = 0;
- return --host->sg_len;
-}
-
-static char *tmio_mmc_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
-{
- local_irq_save(*flags);
- return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
-}
-
-static void tmio_mmc_kunmap_atomic(struct scatterlist *sg, unsigned long *flags, void *virt)
-{
- kunmap_atomic(virt - sg->offset, KM_BIO_SRC_IRQ);
- local_irq_restore(*flags);
-}
-
-#ifdef CONFIG_MMC_DEBUG
-
-#define STATUS_TO_TEXT(a, status, i) \
- do { \
- if (status & TMIO_STAT_##a) { \
- if (i++) \
- printk(" | "); \
- printk(#a); \
- } \
- } while (0)
-
-void pr_debug_status(u32 status)
-{
- int i = 0;
- printk(KERN_DEBUG "status: %08x = ", status);
- STATUS_TO_TEXT(CARD_REMOVE, status, i);
- STATUS_TO_TEXT(CARD_INSERT, status, i);
- STATUS_TO_TEXT(SIGSTATE, status, i);
- STATUS_TO_TEXT(WRPROTECT, status, i);
- STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
- STATUS_TO_TEXT(CARD_INSERT_A, status, i);
- STATUS_TO_TEXT(SIGSTATE_A, status, i);
- STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
- STATUS_TO_TEXT(STOPBIT_ERR, status, i);
- STATUS_TO_TEXT(ILL_FUNC, status, i);
- STATUS_TO_TEXT(CMD_BUSY, status, i);
- STATUS_TO_TEXT(CMDRESPEND, status, i);
- STATUS_TO_TEXT(DATAEND, status, i);
- STATUS_TO_TEXT(CRCFAIL, status, i);
- STATUS_TO_TEXT(DATATIMEOUT, status, i);
- STATUS_TO_TEXT(CMDTIMEOUT, status, i);
- STATUS_TO_TEXT(RXOVERFLOW, status, i);
- STATUS_TO_TEXT(TXUNDERRUN, status, i);
- STATUS_TO_TEXT(RXRDY, status, i);
- STATUS_TO_TEXT(TXRQ, status, i);
- STATUS_TO_TEXT(ILL_ACCESS, status, i);
- printk("\n");
-}
-
-#else
-#define pr_debug_status(s) do { } while (0)
-#endif
-
-static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
-
- if (enable) {
- host->sdio_irq_enabled = 1;
- sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
- sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK,
- (TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ));
- } else {
- sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, TMIO_SDIO_MASK_ALL);
- sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
- host->sdio_irq_enabled = 0;
- }
-}
-
-static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
-{
- u32 clk = 0, clock;
-
- if (new_clock) {
- for (clock = host->mmc->f_min, clk = 0x80000080;
- new_clock >= (clock<<1); clk >>= 1)
- clock <<= 1;
- clk |= 0x100;
- }
-
- if (host->set_clk_div)
- host->set_clk_div(host->pdev, (clk>>22) & 1);
-
- sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
-}
-
-static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
-{
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
-
- /*
- * Testing on sh-mobile showed that SDIO IRQs are unmasked when
- * CTL_CLK_AND_WAIT_CTL gets written, so we have to disable the
- * device IRQ here and restore the SDIO IRQ mask before
- * re-enabling the device IRQ.
- */
- if (pdata->flags & TMIO_MMC_SDIO_IRQ)
- disable_irq(host->irq);
- sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
- msleep(10);
- if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
- tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
- enable_irq(host->irq);
- }
- sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
- sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
- msleep(10);
-}
-
-static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
-{
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
-
- sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
- sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
- msleep(10);
- /* see comment in tmio_mmc_clk_stop above */
- if (pdata->flags & TMIO_MMC_SDIO_IRQ)
- disable_irq(host->irq);
- sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
- msleep(10);
- if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
- tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
- enable_irq(host->irq);
- }
-}
-
-static void reset(struct tmio_mmc_host *host)
-{
- /* FIXME - should we set stop clock reg here */
- sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
- sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
- msleep(10);
- sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
- sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
- msleep(10);
-}
-
-static void tmio_mmc_reset_work(struct work_struct *work)
-{
- struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
- delayed_reset_work.work);
- struct mmc_request *mrq;
- unsigned long flags;
-
- spin_lock_irqsave(&host->lock, flags);
- mrq = host->mrq;
-
- /* request already finished */
- if (!mrq
- || time_is_after_jiffies(host->last_req_ts +
- msecs_to_jiffies(2000))) {
- spin_unlock_irqrestore(&host->lock, flags);
- return;
- }
-
- dev_warn(&host->pdev->dev,
- "timeout waiting for hardware interrupt (CMD%u)\n",
- mrq->cmd->opcode);
-
- if (host->data)
- host->data->error = -ETIMEDOUT;
- else if (host->cmd)
- host->cmd->error = -ETIMEDOUT;
- else
- mrq->cmd->error = -ETIMEDOUT;
-
- host->cmd = NULL;
- host->data = NULL;
- host->mrq = NULL;
- host->force_pio = false;
-
- spin_unlock_irqrestore(&host->lock, flags);
- reset(host);
-
- mmc_request_done(host->mmc, mrq);
-}
-
-static void
-tmio_mmc_finish_request(struct tmio_mmc_host *host)
-{
- struct mmc_request *mrq = host->mrq;
-
- if (!mrq)
- return;
-
- host->mrq = NULL;
- host->cmd = NULL;
- host->data = NULL;
- host->force_pio = false;
-
- cancel_delayed_work(&host->delayed_reset_work);
-
- mmc_request_done(host->mmc, mrq);
-}
-
-/* These are the bitmasks the tmio chip requires to implement the MMC response
- * types. Note that R1 and R6 are the same in this scheme. */
-#define APP_CMD 0x0040
-#define RESP_NONE 0x0300
-#define RESP_R1 0x0400
-#define RESP_R1B 0x0500
-#define RESP_R2 0x0600
-#define RESP_R3 0x0700
-#define DATA_PRESENT 0x0800
-#define TRANSFER_READ 0x1000
-#define TRANSFER_MULTI 0x2000
-#define SECURITY_CMD 0x4000
-
-static int
-tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
-{
- struct mmc_data *data = host->data;
- int c = cmd->opcode;
-
- /* Command 12 is handled by hardware */
- if (cmd->opcode = 12 && !cmd->arg) {
- sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
- return 0;
- }
-
- switch (mmc_resp_type(cmd)) {
- case MMC_RSP_NONE: c |= RESP_NONE; break;
- case MMC_RSP_R1: c |= RESP_R1; break;
- case MMC_RSP_R1B: c |= RESP_R1B; break;
- case MMC_RSP_R2: c |= RESP_R2; break;
- case MMC_RSP_R3: c |= RESP_R3; break;
- default:
- pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
- return -EINVAL;
- }
-
- host->cmd = cmd;
-
-/* FIXME - this seems to be ok commented out but the spec suggest this bit
- * should be set when issuing app commands.
- * if(cmd->flags & MMC_FLAG_ACMD)
- * c |= APP_CMD;
- */
- if (data) {
- c |= DATA_PRESENT;
- if (data->blocks > 1) {
- sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
- c |= TRANSFER_MULTI;
- }
- if (data->flags & MMC_DATA_READ)
- c |= TRANSFER_READ;
- }
-
- enable_mmc_irqs(host, TMIO_MASK_CMD);
-
- /* Fire off the command */
- sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
- sd_ctrl_write16(host, CTL_SD_CMD, c);
-
- return 0;
-}
-
-/*
- * This chip always returns (at least?) as much data as you ask for.
- * I'm unsure what happens if you ask for less than a block. This should be
- * looked into to ensure that a funny length read doesnt hose the controller.
- */
-static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
-{
- struct mmc_data *data = host->data;
- void *sg_virt;
- unsigned short *buf;
- unsigned int count;
- unsigned long flags;
-
- if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
- pr_err("PIO IRQ in DMA mode!\n");
- return;
- } else if (!data) {
- pr_debug("Spurious PIO IRQ\n");
- return;
- }
-
- sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
- buf = (unsigned short *)(sg_virt + host->sg_off);
-
- count = host->sg_ptr->length - host->sg_off;
- if (count > data->blksz)
- count = data->blksz;
-
- pr_debug("count: %08x offset: %08x flags %08x\n",
- count, host->sg_off, data->flags);
-
- /* Transfer the data */
- if (data->flags & MMC_DATA_READ)
- sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
- else
- sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
-
- host->sg_off += count;
-
- tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
-
- if (host->sg_off = host->sg_ptr->length)
- tmio_mmc_next_sg(host);
-
- return;
-}
-
-/* needs to be called with host->lock held */
-static void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
-{
- struct mmc_data *data = host->data;
- struct mmc_command *stop;
-
- host->data = NULL;
-
- if (!data) {
- dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
- return;
- }
- stop = data->stop;
-
- /* FIXME - return correct transfer count on errors */
- if (!data->error)
- data->bytes_xfered = data->blocks * data->blksz;
- else
- data->bytes_xfered = 0;
-
- pr_debug("Completed data request\n");
-
- /*
- * FIXME: other drivers allow an optional stop command of any given type
- * which we dont do, as the chip can auto generate them.
- * Perhaps we can be smarter about when to use auto CMD12 and
- * only issue the auto request when we know this is the desired
- * stop command, allowing fallback to the stop command the
- * upper layers expect. For now, we do what works.
- */
-
- if (data->flags & MMC_DATA_READ) {
- if (host->chan_rx && !host->force_pio)
- tmio_check_bounce_buffer(host);
- dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
- host->mrq);
- } else {
- dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
- host->mrq);
- }
-
- if (stop) {
- if (stop->opcode = 12 && !stop->arg)
- sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
- else
- BUG();
- }
-
- tmio_mmc_finish_request(host);
-}
-
-static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
-{
- struct mmc_data *data;
- spin_lock(&host->lock);
- data = host->data;
-
- if (!data)
- goto out;
-
- if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
- /*
- * Has all data been written out yet? Testing on SuperH showed,
- * that in most cases the first interrupt comes already with the
- * BUSY status bit clear, but on some operations, like mount or
- * in the beginning of a write / sync / umount, there is one
- * DATAEND interrupt with the BUSY bit set, in this cases
- * waiting for one more interrupt fixes the problem.
- */
- if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
- disable_mmc_irqs(host, TMIO_STAT_DATAEND);
- tasklet_schedule(&host->dma_complete);
- }
- } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
- disable_mmc_irqs(host, TMIO_STAT_DATAEND);
- tasklet_schedule(&host->dma_complete);
- } else {
- tmio_mmc_do_data_irq(host);
- disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
- }
-out:
- spin_unlock(&host->lock);
-}
-
-static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
- unsigned int stat)
-{
- struct mmc_command *cmd = host->cmd;
- int i, addr;
-
- spin_lock(&host->lock);
-
- if (!host->cmd) {
- pr_debug("Spurious CMD irq\n");
- goto out;
- }
-
- host->cmd = NULL;
-
- /* This controller is sicker than the PXA one. Not only do we need to
- * drop the top 8 bits of the first response word, we also need to
- * modify the order of the response for short response command types.
- */
-
- for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
- cmd->resp[i] = sd_ctrl_read32(host, addr);
-
- if (cmd->flags & MMC_RSP_136) {
- cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
- cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
- cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
- cmd->resp[3] <<= 8;
- } else if (cmd->flags & MMC_RSP_R3) {
- cmd->resp[0] = cmd->resp[3];
- }
-
- if (stat & TMIO_STAT_CMDTIMEOUT)
- cmd->error = -ETIMEDOUT;
- else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
- cmd->error = -EILSEQ;
-
- /* If there is data to handle we enable data IRQs here, and
- * we will ultimatley finish the request in the data_end handler.
- * If theres no data or we encountered an error, finish now.
- */
- if (host->data && !cmd->error) {
- if (host->data->flags & MMC_DATA_READ) {
- if (host->force_pio || !host->chan_rx)
- enable_mmc_irqs(host, TMIO_MASK_READOP);
- else
- tasklet_schedule(&host->dma_issue);
- } else {
- if (host->force_pio || !host->chan_tx)
- enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
- else
- tasklet_schedule(&host->dma_issue);
- }
- } else {
- tmio_mmc_finish_request(host);
- }
-
-out:
- spin_unlock(&host->lock);
-
- return;
-}
-
-static irqreturn_t tmio_mmc_irq(int irq, void *devid)
-{
- struct tmio_mmc_host *host = devid;
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
- unsigned int ireg, irq_mask, status;
- unsigned int sdio_ireg, sdio_irq_mask, sdio_status;
-
- pr_debug("MMC IRQ begin\n");
-
- status = sd_ctrl_read32(host, CTL_STATUS);
- irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
- ireg = status & TMIO_MASK_IRQ & ~irq_mask;
-
- sdio_ireg = 0;
- if (!ireg && pdata->flags & TMIO_MMC_SDIO_IRQ) {
- sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
- sdio_irq_mask = sd_ctrl_read16(host, CTL_SDIO_IRQ_MASK);
- sdio_ireg = sdio_status & TMIO_SDIO_MASK_ALL & ~sdio_irq_mask;
-
- sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL);
-
- if (sdio_ireg && !host->sdio_irq_enabled) {
- pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n",
- sdio_status, sdio_irq_mask, sdio_ireg);
- tmio_mmc_enable_sdio_irq(host->mmc, 0);
- goto out;
- }
-
- if (host->mmc->caps & MMC_CAP_SDIO_IRQ &&
- sdio_ireg & TMIO_SDIO_STAT_IOIRQ)
- mmc_signal_sdio_irq(host->mmc);
-
- if (sdio_ireg)
- goto out;
- }
-
- pr_debug_status(status);
- pr_debug_status(ireg);
-
- if (!ireg) {
- disable_mmc_irqs(host, status & ~irq_mask);
-
- pr_warning("tmio_mmc: Spurious irq, disabling! "
- "0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg);
- pr_debug_status(status);
-
- goto out;
- }
-
- while (ireg) {
- /* Card insert / remove attempts */
- if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
- ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
- TMIO_STAT_CARD_REMOVE);
- mmc_detect_change(host->mmc, msecs_to_jiffies(100));
- }
-
- /* CRC and other errors */
-/* if (ireg & TMIO_STAT_ERR_IRQ)
- * handled |= tmio_error_irq(host, irq, stat);
- */
-
- /* Command completion */
- if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
- ack_mmc_irqs(host,
- TMIO_STAT_CMDRESPEND |
- TMIO_STAT_CMDTIMEOUT);
- tmio_mmc_cmd_irq(host, status);
- }
-
- /* Data transfer */
- if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
- ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
- tmio_mmc_pio_irq(host);
- }
-
- /* Data transfer completion */
- if (ireg & TMIO_STAT_DATAEND) {
- ack_mmc_irqs(host, TMIO_STAT_DATAEND);
- tmio_mmc_data_irq(host);
- }
-
- /* Check status - keep going until we've handled it all */
- status = sd_ctrl_read32(host, CTL_STATUS);
- irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
- ireg = status & TMIO_MASK_IRQ & ~irq_mask;
-
- pr_debug("Status at end of loop: %08x\n", status);
- pr_debug_status(status);
- }
- pr_debug("MMC IRQ end\n");
-
-out:
- return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_TMIO_MMC_DMA
-static void tmio_check_bounce_buffer(struct tmio_mmc_host *host)
-{
- if (host->sg_ptr = &host->bounce_sg) {
- unsigned long flags;
- void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
- memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
- tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
- }
-}
-
-static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
-{
-#if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE)
- /* Switch DMA mode on or off - SuperH specific? */
- sd_ctrl_write16(host, 0xd8, enable ? 2 : 0);
-#endif
-}
-
-static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
-{
- struct scatterlist *sg = host->sg_ptr, *sg_tmp;
- struct dma_async_tx_descriptor *desc = NULL;
- struct dma_chan *chan = host->chan_rx;
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
- dma_cookie_t cookie;
- int ret, i;
- bool aligned = true, multiple = true;
- unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
-
- for_each_sg(sg, sg_tmp, host->sg_len, i) {
- if (sg_tmp->offset & align)
- aligned = false;
- if (sg_tmp->length & align) {
- multiple = false;
- break;
- }
- }
-
- if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
- align >= MAX_ALIGN)) || !multiple) {
- ret = -EINVAL;
- goto pio;
- }
-
- if (sg->length < TMIO_MIN_DMA_LEN) {
- host->force_pio = true;
- return;
- }
-
- disable_mmc_irqs(host, TMIO_STAT_RXRDY);
-
- /* The only sg element can be unaligned, use our bounce buffer then */
- if (!aligned) {
- sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
- host->sg_ptr = &host->bounce_sg;
- sg = host->sg_ptr;
- }
-
- ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
- if (ret > 0)
- desc = chan->device->device_prep_slave_sg(chan, sg, ret,
- DMA_FROM_DEVICE, DMA_CTRL_ACK);
-
- if (desc)
- cookie = dmaengine_submit(desc);
-
- dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
- __func__, host->sg_len, ret, cookie, host->mrq);
-
-pio:
- if (!desc) {
- /* DMA failed, fall back to PIO */
- if (ret >= 0)
- ret = -EIO;
- host->chan_rx = NULL;
- dma_release_channel(chan);
- /* Free the Tx channel too */
- chan = host->chan_tx;
- if (chan) {
- host->chan_tx = NULL;
- dma_release_channel(chan);
- }
- dev_warn(&host->pdev->dev,
- "DMA failed: %d, falling back to PIO\n", ret);
- tmio_mmc_enable_dma(host, false);
- }
-
- dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
- desc, cookie, host->sg_len);
-}
-
-static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
-{
- struct scatterlist *sg = host->sg_ptr, *sg_tmp;
- struct dma_async_tx_descriptor *desc = NULL;
- struct dma_chan *chan = host->chan_tx;
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
- dma_cookie_t cookie;
- int ret, i;
- bool aligned = true, multiple = true;
- unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
-
- for_each_sg(sg, sg_tmp, host->sg_len, i) {
- if (sg_tmp->offset & align)
- aligned = false;
- if (sg_tmp->length & align) {
- multiple = false;
- break;
- }
- }
-
- if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
- align >= MAX_ALIGN)) || !multiple) {
- ret = -EINVAL;
- goto pio;
- }
-
- if (sg->length < TMIO_MIN_DMA_LEN) {
- host->force_pio = true;
- return;
- }
-
- disable_mmc_irqs(host, TMIO_STAT_TXRQ);
-
- /* The only sg element can be unaligned, use our bounce buffer then */
- if (!aligned) {
- unsigned long flags;
- void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
- sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
- memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
- tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
- host->sg_ptr = &host->bounce_sg;
- sg = host->sg_ptr;
- }
-
- ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
- if (ret > 0)
- desc = chan->device->device_prep_slave_sg(chan, sg, ret,
- DMA_TO_DEVICE, DMA_CTRL_ACK);
-
- if (desc)
- cookie = dmaengine_submit(desc);
-
- dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
- __func__, host->sg_len, ret, cookie, host->mrq);
-
-pio:
- if (!desc) {
- /* DMA failed, fall back to PIO */
- if (ret >= 0)
- ret = -EIO;
- host->chan_tx = NULL;
- dma_release_channel(chan);
- /* Free the Rx channel too */
- chan = host->chan_rx;
- if (chan) {
- host->chan_rx = NULL;
- dma_release_channel(chan);
- }
- dev_warn(&host->pdev->dev,
- "DMA failed: %d, falling back to PIO\n", ret);
- tmio_mmc_enable_dma(host, false);
- }
-
- dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__,
- desc, cookie);
-}
-
-static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
- struct mmc_data *data)
-{
- if (data->flags & MMC_DATA_READ) {
- if (host->chan_rx)
- tmio_mmc_start_dma_rx(host);
- } else {
- if (host->chan_tx)
- tmio_mmc_start_dma_tx(host);
- }
-}
-
-static void tmio_issue_tasklet_fn(unsigned long priv)
-{
- struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
- struct dma_chan *chan = NULL;
-
- spin_lock_irq(&host->lock);
-
- if (host && host->data) {
- if (host->data->flags & MMC_DATA_READ)
- chan = host->chan_rx;
- else
- chan = host->chan_tx;
- }
-
- spin_unlock_irq(&host->lock);
-
- enable_mmc_irqs(host, TMIO_STAT_DATAEND);
-
- if (chan)
- dma_async_issue_pending(chan);
-}
-
-static void tmio_tasklet_fn(unsigned long arg)
-{
- struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
-
- spin_lock_irq(&host->lock);
-
- if (!host->data)
- goto out;
-
- if (host->data->flags & MMC_DATA_READ)
- dma_unmap_sg(host->chan_rx->device->dev,
- host->sg_ptr, host->sg_len,
- DMA_FROM_DEVICE);
- else
- dma_unmap_sg(host->chan_tx->device->dev,
- host->sg_ptr, host->sg_len,
- DMA_TO_DEVICE);
-
- tmio_mmc_do_data_irq(host);
-out:
- spin_unlock_irq(&host->lock);
-}
-
-/* It might be necessary to make filter MFD specific */
-static bool tmio_mmc_filter(struct dma_chan *chan, void *arg)
-{
- dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
- chan->private = arg;
- return true;
-}
-
-static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata)
-{
- /* We can only either use DMA for both Tx and Rx or not use it at all */
- if (pdata->dma) {
- dma_cap_mask_t mask;
-
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
- host->chan_tx = dma_request_channel(mask, tmio_mmc_filter,
- pdata->dma->chan_priv_tx);
- dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
- host->chan_tx);
-
- if (!host->chan_tx)
- return;
-
- host->chan_rx = dma_request_channel(mask, tmio_mmc_filter,
- pdata->dma->chan_priv_rx);
- dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
- host->chan_rx);
-
- if (!host->chan_rx) {
- dma_release_channel(host->chan_tx);
- host->chan_tx = NULL;
- return;
- }
-
- tasklet_init(&host->dma_complete, tmio_tasklet_fn, (unsigned long)host);
- tasklet_init(&host->dma_issue, tmio_issue_tasklet_fn, (unsigned long)host);
-
- tmio_mmc_enable_dma(host, true);
- }
-}
-
-static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
-{
- if (host->chan_tx) {
- struct dma_chan *chan = host->chan_tx;
- host->chan_tx = NULL;
- dma_release_channel(chan);
- }
- if (host->chan_rx) {
- struct dma_chan *chan = host->chan_rx;
- host->chan_rx = NULL;
- dma_release_channel(chan);
- }
-}
-#else
-static void tmio_check_bounce_buffer(struct tmio_mmc_host *host)
-{
-}
-
-static void tmio_mmc_start_dma(struct tmio_mmc_host *host,
- struct mmc_data *data)
-{
-}
-
-static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
- struct tmio_mmc_data *pdata)
-{
- host->chan_tx = NULL;
- host->chan_rx = NULL;
-}
-
-static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
-{
-}
-#endif
-
-static int tmio_mmc_start_data(struct tmio_mmc_host *host,
- struct mmc_data *data)
-{
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
-
- pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
- data->blksz, data->blocks);
-
- /* Some hardware cannot perform 2 byte requests in 4 bit mode */
- if (host->mmc->ios.bus_width = MMC_BUS_WIDTH_4) {
- int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
-
- if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
- pr_err("%s: %d byte block unsupported in 4 bit mode\n",
- mmc_hostname(host->mmc), data->blksz);
- return -EINVAL;
- }
- }
-
- tmio_mmc_init_sg(host, data);
- host->data = data;
-
- /* Set transfer length / blocksize */
- sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
- sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
-
- tmio_mmc_start_dma(host, data);
-
- return 0;
-}
-
-/* Process requests from the MMC layer */
-static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
- int ret;
-
- if (host->mrq)
- pr_debug("request not null\n");
-
- host->last_req_ts = jiffies;
- wmb();
- host->mrq = mrq;
-
- if (mrq->data) {
- ret = tmio_mmc_start_data(host, mrq->data);
- if (ret)
- goto fail;
- }
-
- ret = tmio_mmc_start_command(host, mrq->cmd);
- if (!ret) {
- schedule_delayed_work(&host->delayed_reset_work,
- msecs_to_jiffies(2000));
- return;
- }
-
-fail:
- host->mrq = NULL;
- host->force_pio = false;
- mrq->cmd->error = ret;
- mmc_request_done(mmc, mrq);
-}
-
-/* Set MMC clock / power.
- * Note: This controller uses a simple divider scheme therefore it cannot
- * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
- * MMC wont run that fast, it has to be clocked at 12MHz which is the next
- * slowest setting.
- */
-static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
-
- if (ios->clock)
- tmio_mmc_set_clock(host, ios->clock);
-
- /* Power sequence - OFF -> ON -> UP */
- switch (ios->power_mode) {
- case MMC_POWER_OFF: /* power down SD bus */
- if (host->set_pwr)
- host->set_pwr(host->pdev, 0);
- tmio_mmc_clk_stop(host);
- break;
- case MMC_POWER_ON: /* power up SD bus */
- if (host->set_pwr)
- host->set_pwr(host->pdev, 1);
- break;
- case MMC_POWER_UP: /* start bus clock */
- tmio_mmc_clk_start(host);
- break;
- }
-
- switch (ios->bus_width) {
- case MMC_BUS_WIDTH_1:
- sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
- break;
- case MMC_BUS_WIDTH_4:
- sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
- break;
- }
-
- /* Let things settle. delay taken from winCE driver */
- udelay(140);
-}
-
-static int tmio_mmc_get_ro(struct mmc_host *mmc)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
-
- return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
- (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)) ? 0 : 1;
-}
-
-static int tmio_mmc_get_cd(struct mmc_host *mmc)
-{
- struct tmio_mmc_host *host = mmc_priv(mmc);
- struct tmio_mmc_data *pdata = mfd_get_data(host->pdev);
-
- if (!pdata->get_cd)
- return -ENOSYS;
- else
- return pdata->get_cd(host->pdev);
-}
-
-static const struct mmc_host_ops tmio_mmc_ops = {
- .request = tmio_mmc_request,
- .set_ios = tmio_mmc_set_ios,
- .get_ro = tmio_mmc_get_ro,
- .get_cd = tmio_mmc_get_cd,
- .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
-};
+#include "tmio_mmc.h"
#ifdef CONFIG_PM
static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state)
@@ -1245,138 +62,54 @@ out:
#define tmio_mmc_resume NULL
#endif
-static int __devinit tmio_mmc_probe(struct platform_device *dev)
+static int __devinit tmio_mmc_probe(struct platform_device *pdev)
{
- const struct mfd_cell *cell = mfd_get_cell(dev);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
struct tmio_mmc_data *pdata;
- struct resource *res_ctl;
struct tmio_mmc_host *host;
- struct mmc_host *mmc;
int ret = -EINVAL;
- u32 irq_mask = TMIO_MASK_CMD;
- if (dev->num_resources != 2)
+ if (pdev->num_resources != 2)
goto out;
- res_ctl = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (!res_ctl)
- goto out;
-
- pdata = mfd_get_data(dev);
+ pdata = mfd_get_data(pdev);
if (!pdata || !pdata->hclk)
goto out;
- ret = -ENOMEM;
-
- mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &dev->dev);
- if (!mmc)
- goto out;
-
- host = mmc_priv(mmc);
- host->mmc = mmc;
- host->pdev = dev;
- platform_set_drvdata(dev, mmc);
-
- host->set_pwr = pdata->set_pwr;
- host->set_clk_div = pdata->set_clk_div;
-
- /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
- host->bus_shift = resource_size(res_ctl) >> 10;
-
- host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
- if (!host->ctl)
- goto host_free;
-
- mmc->ops = &tmio_mmc_ops;
- mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
- mmc->f_max = pdata->hclk;
- mmc->f_min = mmc->f_max / 512;
- mmc->max_segs = 32;
- mmc->max_blk_size = 512;
- mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
- mmc->max_segs;
- mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
- mmc->max_seg_size = mmc->max_req_size;
- if (pdata->ocr_mask)
- mmc->ocr_avail = pdata->ocr_mask;
- else
- mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
-
/* Tell the MFD core we are ready to be enabled */
if (cell->enable) {
- ret = cell->enable(dev);
+ ret = cell->enable(pdev);
if (ret)
- goto unmap_ctl;
+ goto out;
}
- tmio_mmc_clk_stop(host);
- reset(host);
-
- ret = platform_get_irq(dev, 0);
- if (ret >= 0)
- host->irq = ret;
- else
- goto cell_disable;
-
- disable_mmc_irqs(host, TMIO_MASK_ALL);
- if (pdata->flags & TMIO_MMC_SDIO_IRQ)
- tmio_mmc_enable_sdio_irq(mmc, 0);
-
- ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED |
- IRQF_TRIGGER_FALLING, dev_name(&dev->dev), host);
+ ret = tmio_mmc_host_probe(&host, pdev, pdata);
if (ret)
goto cell_disable;
- spin_lock_init(&host->lock);
-
- /* Init delayed work for request timeouts */
- INIT_DELAYED_WORK(&host->delayed_reset_work, tmio_mmc_reset_work);
-
- /* See if we also get DMA */
- tmio_mmc_request_dma(host, pdata);
-
- mmc_add_host(mmc);
-
pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
(unsigned long)host->ctl, host->irq);
- /* Unmask the IRQs we want to know about */
- if (!host->chan_rx)
- irq_mask |= TMIO_MASK_READOP;
- if (!host->chan_tx)
- irq_mask |= TMIO_MASK_WRITEOP;
- enable_mmc_irqs(host, irq_mask);
-
return 0;
cell_disable:
if (cell->disable)
- cell->disable(dev);
-unmap_ctl:
- iounmap(host->ctl);
-host_free:
- mmc_free_host(mmc);
+ cell->disable(pdev);
out:
return ret;
}
-static int __devexit tmio_mmc_remove(struct platform_device *dev)
+static int __devexit tmio_mmc_remove(struct platform_device *pdev)
{
- const struct mfd_cell *cell = mfd_get_cell(dev);
- struct mmc_host *mmc = platform_get_drvdata(dev);
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct mmc_host *mmc = platform_get_drvdata(pdev);
- platform_set_drvdata(dev, NULL);
+ platform_set_drvdata(pdev, NULL);
if (mmc) {
- struct tmio_mmc_host *host = mmc_priv(mmc);
- mmc_remove_host(mmc);
- cancel_delayed_work_sync(&host->delayed_reset_work);
- tmio_mmc_release_dma(host);
- free_irq(host->irq, host);
+ tmio_mmc_host_remove(mmc_priv(mmc));
if (cell->disable)
- cell->disable(dev);
- iounmap(host->ctl);
- mmc_free_host(mmc);
+ cell->disable(pdev);
}
return 0;
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
new file mode 100644
index 0000000..8dedf0a
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -0,0 +1,145 @@
+/*
+ * linux/drivers/mmc/host/tmio_mmc.h
+ *
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
+ *
+ * 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.
+ *
+ * Driver for the MMC / SD / SDIO cell found in:
+ *
+ * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
+ */
+
+#ifndef TMIO_MMC_H
+#define TMIO_MMC_H
+
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+
+/* Definitions for values the CTRL_STATUS register can take. */
+#define TMIO_STAT_CMDRESPEND 0x00000001
+#define TMIO_STAT_DATAEND 0x00000004
+#define TMIO_STAT_CARD_REMOVE 0x00000008
+#define TMIO_STAT_CARD_INSERT 0x00000010
+#define TMIO_STAT_SIGSTATE 0x00000020
+#define TMIO_STAT_WRPROTECT 0x00000080
+#define TMIO_STAT_CARD_REMOVE_A 0x00000100
+#define TMIO_STAT_CARD_INSERT_A 0x00000200
+#define TMIO_STAT_SIGSTATE_A 0x00000400
+#define TMIO_STAT_CMD_IDX_ERR 0x00010000
+#define TMIO_STAT_CRCFAIL 0x00020000
+#define TMIO_STAT_STOPBIT_ERR 0x00040000
+#define TMIO_STAT_DATATIMEOUT 0x00080000
+#define TMIO_STAT_RXOVERFLOW 0x00100000
+#define TMIO_STAT_TXUNDERRUN 0x00200000
+#define TMIO_STAT_CMDTIMEOUT 0x00400000
+#define TMIO_STAT_RXRDY 0x01000000
+#define TMIO_STAT_TXRQ 0x02000000
+#define TMIO_STAT_ILL_FUNC 0x20000000
+#define TMIO_STAT_CMD_BUSY 0x40000000
+#define TMIO_STAT_ILL_ACCESS 0x80000000
+
+/* Definitions for values the CTRL_SDIO_STATUS register can take. */
+#define TMIO_SDIO_STAT_IOIRQ 0x0001
+#define TMIO_SDIO_STAT_EXPUB52 0x4000
+#define TMIO_SDIO_STAT_EXWT 0x8000
+#define TMIO_SDIO_MASK_ALL 0xc007
+
+/* Define some IRQ masks */
+/* This is the mask used at reset by the chip */
+#define TMIO_MASK_ALL 0x837f031d
+#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
+#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
+#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
+ TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
+#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
+
+struct tmio_mmc_data;
+
+struct tmio_mmc_host {
+ void __iomem *ctl;
+ unsigned long bus_shift;
+ struct mmc_command *cmd;
+ struct mmc_request *mrq;
+ struct mmc_data *data;
+ struct mmc_host *mmc;
+ int irq;
+ unsigned int sdio_irq_enabled;
+
+ /* Callbacks for clock / power control */
+ void (*set_pwr)(struct platform_device *host, int state);
+ void (*set_clk_div)(struct platform_device *host, int state);
+
+ /* pio related stuff */
+ struct scatterlist *sg_ptr;
+ struct scatterlist *sg_orig;
+ unsigned int sg_len;
+ unsigned int sg_off;
+
+ struct platform_device *pdev;
+ struct tmio_mmc_data *pdata;
+
+ /* DMA support */
+ bool force_pio;
+ struct dma_chan *chan_rx;
+ struct dma_chan *chan_tx;
+ struct tasklet_struct dma_complete;
+ struct tasklet_struct dma_issue;
+ struct scatterlist bounce_sg;
+ u8 *bounce_buf;
+
+ /* Track lost interrupts */
+ struct delayed_work delayed_reset_work;
+ spinlock_t lock;
+ unsigned long last_req_ts;
+};
+
+int tmio_mmc_host_probe(struct tmio_mmc_host **host,
+ struct platform_device *pdev,
+ struct tmio_mmc_data *pdata);
+void tmio_mmc_host_remove(struct tmio_mmc_host *host);
+void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
+
+void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
+void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
+
+static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
+ unsigned long *flags)
+{
+ local_irq_save(*flags);
+ return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset;
+}
+
+static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
+ unsigned long *flags, void *virt)
+{
+ kunmap_atomic(virt - sg->offset, KM_BIO_SRC_IRQ);
+ local_irq_restore(*flags);
+}
+
+#ifdef CONFIG_TMIO_MMC_DMA
+void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
+void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
+void tmio_mmc_release_dma(struct tmio_mmc_host *host);
+#else
+static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+}
+
+static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
+{
+ host->chan_tx = NULL;
+ host->chan_rx = NULL;
+}
+
+static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+}
+#endif
+
+#endif
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c
new file mode 100644
index 0000000..c505278
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc_dma.c
@@ -0,0 +1,316 @@
+/*
+ * linux/drivers/mmc/tmio_mmc_dma.c
+ *
+ * Copyright (C) 2010-2011 Guennadi Liakhovetski
+ *
+ * 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.
+ *
+ * DMA function for TMIO MMC implementations
+ */
+
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/host.h>
+#include <linux/pagemap.h>
+#include <linux/scatterlist.h>
+
+#include "tmio_mmc.h"
+
+#define TMIO_MMC_MIN_DMA_LEN 8
+
+static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
+{
+#if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE)
+ /* Switch DMA mode on or off - SuperH specific? */
+ writew(enable ? 2 : 0, host->ctl + (0xd8 << host->bus_shift));
+#endif
+}
+
+static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
+{
+ struct scatterlist *sg = host->sg_ptr, *sg_tmp;
+ struct dma_async_tx_descriptor *desc = NULL;
+ struct dma_chan *chan = host->chan_rx;
+ struct tmio_mmc_data *pdata = host->pdata;
+ dma_cookie_t cookie;
+ int ret, i;
+ bool aligned = true, multiple = true;
+ unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
+
+ for_each_sg(sg, sg_tmp, host->sg_len, i) {
+ if (sg_tmp->offset & align)
+ aligned = false;
+ if (sg_tmp->length & align) {
+ multiple = false;
+ break;
+ }
+ }
+
+ if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
+ (align & PAGE_MASK))) || !multiple) {
+ ret = -EINVAL;
+ goto pio;
+ }
+
+ if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
+ host->force_pio = true;
+ return;
+ }
+
+ tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY);
+
+ /* The only sg element can be unaligned, use our bounce buffer then */
+ if (!aligned) {
+ sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
+ host->sg_ptr = &host->bounce_sg;
+ sg = host->sg_ptr;
+ }
+
+ ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
+ if (ret > 0)
+ desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+ DMA_FROM_DEVICE, DMA_CTRL_ACK);
+
+ if (desc) {
+ cookie = dmaengine_submit(desc);
+ if (cookie < 0) {
+ desc = NULL;
+ ret = cookie;
+ }
+ }
+ dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
+ __func__, host->sg_len, ret, cookie, host->mrq);
+
+pio:
+ if (!desc) {
+ /* DMA failed, fall back to PIO */
+ if (ret >= 0)
+ ret = -EIO;
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ /* Free the Tx channel too */
+ chan = host->chan_tx;
+ if (chan) {
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ }
+ dev_warn(&host->pdev->dev,
+ "DMA failed: %d, falling back to PIO\n", ret);
+ tmio_mmc_enable_dma(host, false);
+ }
+
+ dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
+ desc, cookie, host->sg_len);
+}
+
+static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
+{
+ struct scatterlist *sg = host->sg_ptr, *sg_tmp;
+ struct dma_async_tx_descriptor *desc = NULL;
+ struct dma_chan *chan = host->chan_tx;
+ struct tmio_mmc_data *pdata = host->pdata;
+ dma_cookie_t cookie;
+ int ret, i;
+ bool aligned = true, multiple = true;
+ unsigned int align = (1 << pdata->dma->alignment_shift) - 1;
+
+ for_each_sg(sg, sg_tmp, host->sg_len, i) {
+ if (sg_tmp->offset & align)
+ aligned = false;
+ if (sg_tmp->length & align) {
+ multiple = false;
+ break;
+ }
+ }
+
+ if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE ||
+ (align & PAGE_MASK))) || !multiple) {
+ ret = -EINVAL;
+ goto pio;
+ }
+
+ if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
+ host->force_pio = true;
+ return;
+ }
+
+ tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ);
+
+ /* The only sg element can be unaligned, use our bounce buffer then */
+ if (!aligned) {
+ unsigned long flags;
+ void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
+ sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
+ memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
+ tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
+ host->sg_ptr = &host->bounce_sg;
+ sg = host->sg_ptr;
+ }
+
+ ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
+ if (ret > 0)
+ desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+ DMA_TO_DEVICE, DMA_CTRL_ACK);
+
+ if (desc) {
+ cookie = dmaengine_submit(desc);
+ if (cookie < 0) {
+ desc = NULL;
+ ret = cookie;
+ }
+ }
+ dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
+ __func__, host->sg_len, ret, cookie, host->mrq);
+
+pio:
+ if (!desc) {
+ /* DMA failed, fall back to PIO */
+ if (ret >= 0)
+ ret = -EIO;
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ /* Free the Rx channel too */
+ chan = host->chan_rx;
+ if (chan) {
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ }
+ dev_warn(&host->pdev->dev,
+ "DMA failed: %d, falling back to PIO\n", ret);
+ tmio_mmc_enable_dma(host, false);
+ }
+
+ dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__,
+ desc, cookie);
+}
+
+void tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+ if (data->flags & MMC_DATA_READ) {
+ if (host->chan_rx)
+ tmio_mmc_start_dma_rx(host);
+ } else {
+ if (host->chan_tx)
+ tmio_mmc_start_dma_tx(host);
+ }
+}
+
+static void tmio_mmc_issue_tasklet_fn(unsigned long priv)
+{
+ struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
+ struct dma_chan *chan = NULL;
+
+ spin_lock_irq(&host->lock);
+
+ if (host && host->data) {
+ if (host->data->flags & MMC_DATA_READ)
+ chan = host->chan_rx;
+ else
+ chan = host->chan_tx;
+ }
+
+ spin_unlock_irq(&host->lock);
+
+ tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
+
+ if (chan)
+ dma_async_issue_pending(chan);
+}
+
+static void tmio_mmc_tasklet_fn(unsigned long arg)
+{
+ struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
+
+ spin_lock_irq(&host->lock);
+
+ if (!host->data)
+ goto out;
+
+ if (host->data->flags & MMC_DATA_READ)
+ dma_unmap_sg(host->chan_rx->device->dev,
+ host->sg_ptr, host->sg_len,
+ DMA_FROM_DEVICE);
+ else
+ dma_unmap_sg(host->chan_tx->device->dev,
+ host->sg_ptr, host->sg_len,
+ DMA_TO_DEVICE);
+
+ tmio_mmc_do_data_irq(host);
+out:
+ spin_unlock_irq(&host->lock);
+}
+
+/* It might be necessary to make filter MFD specific */
+static bool tmio_mmc_filter(struct dma_chan *chan, void *arg)
+{
+ dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
+ chan->private = arg;
+ return true;
+}
+
+void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata)
+{
+ /* We can only either use DMA for both Tx and Rx or not use it at all */
+ if (pdata->dma) {
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ host->chan_tx = dma_request_channel(mask, tmio_mmc_filter,
+ pdata->dma->chan_priv_tx);
+ dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
+ host->chan_tx);
+
+ if (!host->chan_tx)
+ return;
+
+ host->chan_rx = dma_request_channel(mask, tmio_mmc_filter,
+ pdata->dma->chan_priv_rx);
+ dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
+ host->chan_rx);
+
+ if (!host->chan_rx)
+ goto ereqrx;
+
+ host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!host->bounce_buf)
+ goto ebouncebuf;
+
+ tasklet_init(&host->dma_complete, tmio_mmc_tasklet_fn, (unsigned long)host);
+ tasklet_init(&host->dma_issue, tmio_mmc_issue_tasklet_fn, (unsigned long)host);
+
+ tmio_mmc_enable_dma(host, true);
+
+ return;
+ebouncebuf:
+ dma_release_channel(host->chan_rx);
+ host->chan_rx = NULL;
+ereqrx:
+ dma_release_channel(host->chan_tx);
+ host->chan_tx = NULL;
+ return;
+ }
+}
+
+void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+ if (host->chan_tx) {
+ struct dma_chan *chan = host->chan_tx;
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ }
+ if (host->chan_rx) {
+ struct dma_chan *chan = host->chan_rx;
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ }
+ if (host->bounce_buf) {
+ free_pages((unsigned long)host->bounce_buf, 0);
+ host->bounce_buf = NULL;
+ }
+}
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
new file mode 100644
index 0000000..a7406e3
--- /dev/null
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -0,0 +1,923 @@
+/*
+ * linux/drivers/mmc/host/tmio_mmc_pio.c
+ *
+ * Copyright (C) 2011 Guennadi Liakhovetski
+ * Copyright (C) 2007 Ian Molton
+ * Copyright (C) 2004 Ian Molton
+ *
+ * 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.
+ *
+ * Driver for the MMC / SD / SDIO IP found in:
+ *
+ * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
+ *
+ * This driver draws mainly on scattered spec sheets, Reverse engineering
+ * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
+ * support). (Further 4 bit support from a later datasheet).
+ *
+ * TODO:
+ * Investigate using a workqueue for PIO transfers
+ * Eliminate FIXMEs
+ * SDIO support
+ * Better Power management
+ * Handle MMC errors better
+ * double buffer support
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/highmem.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+
+#include "tmio_mmc.h"
+
+#define CTL_SD_CMD 0x00
+#define CTL_ARG_REG 0x04
+#define CTL_STOP_INTERNAL_ACTION 0x08
+#define CTL_XFER_BLK_COUNT 0xa
+#define CTL_RESPONSE 0x0c
+#define CTL_STATUS 0x1c
+#define CTL_IRQ_MASK 0x20
+#define CTL_SD_CARD_CLK_CTL 0x24
+#define CTL_SD_XFER_LEN 0x26
+#define CTL_SD_MEM_CARD_OPT 0x28
+#define CTL_SD_ERROR_DETAIL_STATUS 0x2c
+#define CTL_SD_DATA_PORT 0x30
+#define CTL_TRANSACTION_CTL 0x34
+#define CTL_SDIO_STATUS 0x36
+#define CTL_SDIO_IRQ_MASK 0x38
+#define CTL_RESET_SD 0xe0
+#define CTL_SDIO_REGS 0x100
+#define CTL_CLK_AND_WAIT_CTL 0x138
+#define CTL_RESET_SDIO 0x1e0
+
+static u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
+{
+ return readw(host->ctl + (addr << host->bus_shift));
+}
+
+static void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
+ u16 *buf, int count)
+{
+ readsw(host->ctl + (addr << host->bus_shift), buf, count);
+}
+
+static u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
+{
+ return readw(host->ctl + (addr << host->bus_shift)) |
+ readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
+}
+
+static void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
+{
+ writew(val, host->ctl + (addr << host->bus_shift));
+}
+
+static void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
+ u16 *buf, int count)
+{
+ writesw(host->ctl + (addr << host->bus_shift), buf, count);
+}
+
+static void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
+{
+ writew(val, host->ctl + (addr << host->bus_shift));
+ writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
+}
+
+void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+ u32 mask = sd_ctrl_read32(host, CTL_IRQ_MASK) & ~(i & TMIO_MASK_IRQ);
+ sd_ctrl_write32(host, CTL_IRQ_MASK, mask);
+}
+
+void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+ u32 mask = sd_ctrl_read32(host, CTL_IRQ_MASK) | (i & TMIO_MASK_IRQ);
+ sd_ctrl_write32(host, CTL_IRQ_MASK, mask);
+}
+
+static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
+{
+ sd_ctrl_write32(host, CTL_STATUS, ~i);
+}
+
+static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
+{
+ host->sg_len = data->sg_len;
+ host->sg_ptr = data->sg;
+ host->sg_orig = data->sg;
+ host->sg_off = 0;
+}
+
+static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
+{
+ host->sg_ptr = sg_next(host->sg_ptr);
+ host->sg_off = 0;
+ return --host->sg_len;
+}
+
+#ifdef CONFIG_MMC_DEBUG
+
+#define STATUS_TO_TEXT(a, status, i) \
+ do { \
+ if (status & TMIO_STAT_##a) { \
+ if (i++) \
+ printk(" | "); \
+ printk(#a); \
+ } \
+ } while (0)
+
+static void pr_debug_status(u32 status)
+{
+ int i = 0;
+ printk(KERN_DEBUG "status: %08x = ", status);
+ STATUS_TO_TEXT(CARD_REMOVE, status, i);
+ STATUS_TO_TEXT(CARD_INSERT, status, i);
+ STATUS_TO_TEXT(SIGSTATE, status, i);
+ STATUS_TO_TEXT(WRPROTECT, status, i);
+ STATUS_TO_TEXT(CARD_REMOVE_A, status, i);
+ STATUS_TO_TEXT(CARD_INSERT_A, status, i);
+ STATUS_TO_TEXT(SIGSTATE_A, status, i);
+ STATUS_TO_TEXT(CMD_IDX_ERR, status, i);
+ STATUS_TO_TEXT(STOPBIT_ERR, status, i);
+ STATUS_TO_TEXT(ILL_FUNC, status, i);
+ STATUS_TO_TEXT(CMD_BUSY, status, i);
+ STATUS_TO_TEXT(CMDRESPEND, status, i);
+ STATUS_TO_TEXT(DATAEND, status, i);
+ STATUS_TO_TEXT(CRCFAIL, status, i);
+ STATUS_TO_TEXT(DATATIMEOUT, status, i);
+ STATUS_TO_TEXT(CMDTIMEOUT, status, i);
+ STATUS_TO_TEXT(RXOVERFLOW, status, i);
+ STATUS_TO_TEXT(TXUNDERRUN, status, i);
+ STATUS_TO_TEXT(RXRDY, status, i);
+ STATUS_TO_TEXT(TXRQ, status, i);
+ STATUS_TO_TEXT(ILL_ACCESS, status, i);
+ printk("\n");
+}
+
+#else
+#define pr_debug_status(s) do { } while (0)
+#endif
+
+static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+
+ if (enable) {
+ host->sdio_irq_enabled = 1;
+ sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
+ sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK,
+ (TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ));
+ } else {
+ sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, TMIO_SDIO_MASK_ALL);
+ sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
+ host->sdio_irq_enabled = 0;
+ }
+}
+
+static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
+{
+ u32 clk = 0, clock;
+
+ if (new_clock) {
+ for (clock = host->mmc->f_min, clk = 0x80000080;
+ new_clock >= (clock<<1); clk >>= 1)
+ clock <<= 1;
+ clk |= 0x100;
+ }
+
+ if (host->set_clk_div)
+ host->set_clk_div(host->pdev, (clk>>22) & 1);
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
+}
+
+static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
+{
+ struct tmio_mmc_data *pdata = host->pdata;
+
+ /*
+ * Testing on sh-mobile showed that SDIO IRQs are unmasked when
+ * CTL_CLK_AND_WAIT_CTL gets written, so we have to disable the
+ * device IRQ here and restore the SDIO IRQ mask before
+ * re-enabling the device IRQ.
+ */
+ if (pdata->flags & TMIO_MMC_SDIO_IRQ)
+ disable_irq(host->irq);
+ sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
+ msleep(10);
+ if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
+ tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
+ enable_irq(host->irq);
+ }
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 &
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+ msleep(10);
+}
+
+static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
+{
+ struct tmio_mmc_data *pdata = host->pdata;
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 |
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+ msleep(10);
+ /* see comment in tmio_mmc_clk_stop above */
+ if (pdata->flags & TMIO_MMC_SDIO_IRQ)
+ disable_irq(host->irq);
+ sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
+ msleep(10);
+ if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
+ tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled);
+ enable_irq(host->irq);
+ }
+}
+
+static void tmio_mmc_reset(struct tmio_mmc_host *host)
+{
+ /* FIXME - should we set stop clock reg here */
+ sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
+ sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
+ msleep(10);
+ sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
+ sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
+ msleep(10);
+}
+
+static void tmio_mmc_reset_work(struct work_struct *work)
+{
+ struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
+ delayed_reset_work.work);
+ struct mmc_request *mrq;
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ mrq = host->mrq;
+
+ /* request already finished */
+ if (!mrq
+ || time_is_after_jiffies(host->last_req_ts +
+ msecs_to_jiffies(2000))) {
+ spin_unlock_irqrestore(&host->lock, flags);
+ return;
+ }
+
+ dev_warn(&host->pdev->dev,
+ "timeout waiting for hardware interrupt (CMD%u)\n",
+ mrq->cmd->opcode);
+
+ if (host->data)
+ host->data->error = -ETIMEDOUT;
+ else if (host->cmd)
+ host->cmd->error = -ETIMEDOUT;
+ else
+ mrq->cmd->error = -ETIMEDOUT;
+
+ host->cmd = NULL;
+ host->data = NULL;
+ host->mrq = NULL;
+ host->force_pio = false;
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ tmio_mmc_reset(host);
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
+{
+ struct mmc_request *mrq = host->mrq;
+
+ if (!mrq)
+ return;
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+ host->data = NULL;
+ host->force_pio = false;
+
+ cancel_delayed_work(&host->delayed_reset_work);
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+/* These are the bitmasks the tmio chip requires to implement the MMC response
+ * types. Note that R1 and R6 are the same in this scheme. */
+#define APP_CMD 0x0040
+#define RESP_NONE 0x0300
+#define RESP_R1 0x0400
+#define RESP_R1B 0x0500
+#define RESP_R2 0x0600
+#define RESP_R3 0x0700
+#define DATA_PRESENT 0x0800
+#define TRANSFER_READ 0x1000
+#define TRANSFER_MULTI 0x2000
+#define SECURITY_CMD 0x4000
+
+static int tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd)
+{
+ struct mmc_data *data = host->data;
+ int c = cmd->opcode;
+
+ /* Command 12 is handled by hardware */
+ if (cmd->opcode = 12 && !cmd->arg) {
+ sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001);
+ return 0;
+ }
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_NONE: c |= RESP_NONE; break;
+ case MMC_RSP_R1: c |= RESP_R1; break;
+ case MMC_RSP_R1B: c |= RESP_R1B; break;
+ case MMC_RSP_R2: c |= RESP_R2; break;
+ case MMC_RSP_R3: c |= RESP_R3; break;
+ default:
+ pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
+ return -EINVAL;
+ }
+
+ host->cmd = cmd;
+
+/* FIXME - this seems to be ok commented out but the spec suggest this bit
+ * should be set when issuing app commands.
+ * if(cmd->flags & MMC_FLAG_ACMD)
+ * c |= APP_CMD;
+ */
+ if (data) {
+ c |= DATA_PRESENT;
+ if (data->blocks > 1) {
+ sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100);
+ c |= TRANSFER_MULTI;
+ }
+ if (data->flags & MMC_DATA_READ)
+ c |= TRANSFER_READ;
+ }
+
+ tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD);
+
+ /* Fire off the command */
+ sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg);
+ sd_ctrl_write16(host, CTL_SD_CMD, c);
+
+ return 0;
+}
+
+/*
+ * This chip always returns (at least?) as much data as you ask for.
+ * I'm unsure what happens if you ask for less than a block. This should be
+ * looked into to ensure that a funny length read doesnt hose the controller.
+ */
+static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
+{
+ struct mmc_data *data = host->data;
+ void *sg_virt;
+ unsigned short *buf;
+ unsigned int count;
+ unsigned long flags;
+
+ if ((host->chan_tx || host->chan_rx) && !host->force_pio) {
+ pr_err("PIO IRQ in DMA mode!\n");
+ return;
+ } else if (!data) {
+ pr_debug("Spurious PIO IRQ\n");
+ return;
+ }
+
+ sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
+ buf = (unsigned short *)(sg_virt + host->sg_off);
+
+ count = host->sg_ptr->length - host->sg_off;
+ if (count > data->blksz)
+ count = data->blksz;
+
+ pr_debug("count: %08x offset: %08x flags %08x\n",
+ count, host->sg_off, data->flags);
+
+ /* Transfer the data */
+ if (data->flags & MMC_DATA_READ)
+ sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+ else
+ sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
+
+ host->sg_off += count;
+
+ tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
+
+ if (host->sg_off = host->sg_ptr->length)
+ tmio_mmc_next_sg(host);
+
+ return;
+}
+
+static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
+{
+ if (host->sg_ptr = &host->bounce_sg) {
+ unsigned long flags;
+ void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
+ memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
+ tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
+ }
+}
+
+/* needs to be called with host->lock held */
+void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
+{
+ struct mmc_data *data = host->data;
+ struct mmc_command *stop;
+
+ host->data = NULL;
+
+ if (!data) {
+ dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
+ return;
+ }
+ stop = data->stop;
+
+ /* FIXME - return correct transfer count on errors */
+ if (!data->error)
+ data->bytes_xfered = data->blocks * data->blksz;
+ else
+ data->bytes_xfered = 0;
+
+ pr_debug("Completed data request\n");
+
+ /*
+ * FIXME: other drivers allow an optional stop command of any given type
+ * which we dont do, as the chip can auto generate them.
+ * Perhaps we can be smarter about when to use auto CMD12 and
+ * only issue the auto request when we know this is the desired
+ * stop command, allowing fallback to the stop command the
+ * upper layers expect. For now, we do what works.
+ */
+
+ if (data->flags & MMC_DATA_READ) {
+ if (host->chan_rx && !host->force_pio)
+ tmio_mmc_check_bounce_buffer(host);
+ dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
+ host->mrq);
+ } else {
+ dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
+ host->mrq);
+ }
+
+ if (stop) {
+ if (stop->opcode = 12 && !stop->arg)
+ sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000);
+ else
+ BUG();
+ }
+
+ tmio_mmc_finish_request(host);
+}
+
+static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
+{
+ struct mmc_data *data;
+ spin_lock(&host->lock);
+ data = host->data;
+
+ if (!data)
+ goto out;
+
+ if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) {
+ /*
+ * Has all data been written out yet? Testing on SuperH showed,
+ * that in most cases the first interrupt comes already with the
+ * BUSY status bit clear, but on some operations, like mount or
+ * in the beginning of a write / sync / umount, there is one
+ * DATAEND interrupt with the BUSY bit set, in this cases
+ * waiting for one more interrupt fixes the problem.
+ */
+ if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
+ tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+ tasklet_schedule(&host->dma_complete);
+ }
+ } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) {
+ tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+ tasklet_schedule(&host->dma_complete);
+ } else {
+ tmio_mmc_do_data_irq(host);
+ tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
+ }
+out:
+ spin_unlock(&host->lock);
+}
+
+static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
+ unsigned int stat)
+{
+ struct mmc_command *cmd = host->cmd;
+ int i, addr;
+
+ spin_lock(&host->lock);
+
+ if (!host->cmd) {
+ pr_debug("Spurious CMD irq\n");
+ goto out;
+ }
+
+ host->cmd = NULL;
+
+ /* This controller is sicker than the PXA one. Not only do we need to
+ * drop the top 8 bits of the first response word, we also need to
+ * modify the order of the response for short response command types.
+ */
+
+ for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
+ cmd->resp[i] = sd_ctrl_read32(host, addr);
+
+ if (cmd->flags & MMC_RSP_136) {
+ cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
+ cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
+ cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
+ cmd->resp[3] <<= 8;
+ } else if (cmd->flags & MMC_RSP_R3) {
+ cmd->resp[0] = cmd->resp[3];
+ }
+
+ if (stat & TMIO_STAT_CMDTIMEOUT)
+ cmd->error = -ETIMEDOUT;
+ else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC)
+ cmd->error = -EILSEQ;
+
+ /* If there is data to handle we enable data IRQs here, and
+ * we will ultimatley finish the request in the data_end handler.
+ * If theres no data or we encountered an error, finish now.
+ */
+ if (host->data && !cmd->error) {
+ if (host->data->flags & MMC_DATA_READ) {
+ if (host->force_pio || !host->chan_rx)
+ tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
+ else
+ tasklet_schedule(&host->dma_issue);
+ } else {
+ if (host->force_pio || !host->chan_tx)
+ tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+ else
+ tasklet_schedule(&host->dma_issue);
+ }
+ } else {
+ tmio_mmc_finish_request(host);
+ }
+
+out:
+ spin_unlock(&host->lock);
+}
+
+static irqreturn_t tmio_mmc_irq(int irq, void *devid)
+{
+ struct tmio_mmc_host *host = devid;
+ struct tmio_mmc_data *pdata = host->pdata;
+ unsigned int ireg, irq_mask, status;
+ unsigned int sdio_ireg, sdio_irq_mask, sdio_status;
+
+ pr_debug("MMC IRQ begin\n");
+
+ status = sd_ctrl_read32(host, CTL_STATUS);
+ irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
+ ireg = status & TMIO_MASK_IRQ & ~irq_mask;
+
+ sdio_ireg = 0;
+ if (!ireg && pdata->flags & TMIO_MMC_SDIO_IRQ) {
+ sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
+ sdio_irq_mask = sd_ctrl_read16(host, CTL_SDIO_IRQ_MASK);
+ sdio_ireg = sdio_status & TMIO_SDIO_MASK_ALL & ~sdio_irq_mask;
+
+ sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL);
+
+ if (sdio_ireg && !host->sdio_irq_enabled) {
+ pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n",
+ sdio_status, sdio_irq_mask, sdio_ireg);
+ tmio_mmc_enable_sdio_irq(host->mmc, 0);
+ goto out;
+ }
+
+ if (host->mmc->caps & MMC_CAP_SDIO_IRQ &&
+ sdio_ireg & TMIO_SDIO_STAT_IOIRQ)
+ mmc_signal_sdio_irq(host->mmc);
+
+ if (sdio_ireg)
+ goto out;
+ }
+
+ pr_debug_status(status);
+ pr_debug_status(ireg);
+
+ if (!ireg) {
+ tmio_mmc_disable_mmc_irqs(host, status & ~irq_mask);
+
+ pr_warning("tmio_mmc: Spurious irq, disabling! "
+ "0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg);
+ pr_debug_status(status);
+
+ goto out;
+ }
+
+ while (ireg) {
+ /* Card insert / remove attempts */
+ if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
+ tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
+ TMIO_STAT_CARD_REMOVE);
+ mmc_detect_change(host->mmc, msecs_to_jiffies(100));
+ }
+
+ /* CRC and other errors */
+/* if (ireg & TMIO_STAT_ERR_IRQ)
+ * handled |= tmio_error_irq(host, irq, stat);
+ */
+
+ /* Command completion */
+ if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
+ tmio_mmc_ack_mmc_irqs(host,
+ TMIO_STAT_CMDRESPEND |
+ TMIO_STAT_CMDTIMEOUT);
+ tmio_mmc_cmd_irq(host, status);
+ }
+
+ /* Data transfer */
+ if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
+ tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
+ tmio_mmc_pio_irq(host);
+ }
+
+ /* Data transfer completion */
+ if (ireg & TMIO_STAT_DATAEND) {
+ tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
+ tmio_mmc_data_irq(host);
+ }
+
+ /* Check status - keep going until we've handled it all */
+ status = sd_ctrl_read32(host, CTL_STATUS);
+ irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK);
+ ireg = status & TMIO_MASK_IRQ & ~irq_mask;
+
+ pr_debug("Status at end of loop: %08x\n", status);
+ pr_debug_status(status);
+ }
+ pr_debug("MMC IRQ end\n");
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int tmio_mmc_start_data(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct tmio_mmc_data *pdata = host->pdata;
+
+ pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
+ data->blksz, data->blocks);
+
+ /* Some hardware cannot perform 2 byte requests in 4 bit mode */
+ if (host->mmc->ios.bus_width = MMC_BUS_WIDTH_4) {
+ int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
+
+ if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
+ pr_err("%s: %d byte block unsupported in 4 bit mode\n",
+ mmc_hostname(host->mmc), data->blksz);
+ return -EINVAL;
+ }
+ }
+
+ tmio_mmc_init_sg(host, data);
+ host->data = data;
+
+ /* Set transfer length / blocksize */
+ sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
+ sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
+
+ tmio_mmc_start_dma(host, data);
+
+ return 0;
+}
+
+/* Process requests from the MMC layer */
+static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ int ret;
+
+ if (host->mrq)
+ pr_debug("request not null\n");
+
+ host->last_req_ts = jiffies;
+ wmb();
+ host->mrq = mrq;
+
+ if (mrq->data) {
+ ret = tmio_mmc_start_data(host, mrq->data);
+ if (ret)
+ goto fail;
+ }
+
+ ret = tmio_mmc_start_command(host, mrq->cmd);
+ if (!ret) {
+ schedule_delayed_work(&host->delayed_reset_work,
+ msecs_to_jiffies(2000));
+ return;
+ }
+
+fail:
+ host->mrq = NULL;
+ host->force_pio = false;
+ mrq->cmd->error = ret;
+ mmc_request_done(mmc, mrq);
+}
+
+/* Set MMC clock / power.
+ * Note: This controller uses a simple divider scheme therefore it cannot
+ * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
+ * MMC wont run that fast, it has to be clocked at 12MHz which is the next
+ * slowest setting.
+ */
+static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+
+ if (ios->clock)
+ tmio_mmc_set_clock(host, ios->clock);
+
+ /* Power sequence - OFF -> ON -> UP */
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF: /* power down SD bus */
+ if (host->set_pwr)
+ host->set_pwr(host->pdev, 0);
+ tmio_mmc_clk_stop(host);
+ break;
+ case MMC_POWER_ON: /* power up SD bus */
+ if (host->set_pwr)
+ host->set_pwr(host->pdev, 1);
+ break;
+ case MMC_POWER_UP: /* start bus clock */
+ tmio_mmc_clk_start(host);
+ break;
+ }
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0);
+ break;
+ case MMC_BUS_WIDTH_4:
+ sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0);
+ break;
+ }
+
+ /* Let things settle. delay taken from winCE driver */
+ udelay(140);
+}
+
+static int tmio_mmc_get_ro(struct mmc_host *mmc)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct tmio_mmc_data *pdata = host->pdata;
+
+ return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
+ !(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
+}
+
+static int tmio_mmc_get_cd(struct mmc_host *mmc)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct tmio_mmc_data *pdata = host->pdata;
+
+ if (!pdata->get_cd)
+ return -ENOSYS;
+ else
+ return pdata->get_cd(host->pdev);
+}
+
+static const struct mmc_host_ops tmio_mmc_ops = {
+ .request = tmio_mmc_request,
+ .set_ios = tmio_mmc_set_ios,
+ .get_ro = tmio_mmc_get_ro,
+ .get_cd = tmio_mmc_get_cd,
+ .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
+};
+
+int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
+ struct platform_device *pdev,
+ struct tmio_mmc_data *pdata)
+{
+ struct tmio_mmc_host *_host;
+ struct mmc_host *mmc;
+ struct resource *res_ctl;
+ int ret;
+ u32 irq_mask = TMIO_MASK_CMD;
+
+ res_ctl = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res_ctl)
+ return -EINVAL;
+
+ mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ _host = mmc_priv(mmc);
+ _host->pdata = pdata;
+ _host->mmc = mmc;
+ _host->pdev = pdev;
+ platform_set_drvdata(pdev, mmc);
+
+ _host->set_pwr = pdata->set_pwr;
+ _host->set_clk_div = pdata->set_clk_div;
+
+ /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
+ _host->bus_shift = resource_size(res_ctl) >> 10;
+
+ _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
+ if (!_host->ctl) {
+ ret = -ENOMEM;
+ goto host_free;
+ }
+
+ mmc->ops = &tmio_mmc_ops;
+ mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
+ mmc->f_max = pdata->hclk;
+ mmc->f_min = mmc->f_max / 512;
+ mmc->max_segs = 32;
+ mmc->max_blk_size = 512;
+ mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
+ mmc->max_segs;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+ mmc->max_seg_size = mmc->max_req_size;
+ if (pdata->ocr_mask)
+ mmc->ocr_avail = pdata->ocr_mask;
+ else
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+ tmio_mmc_clk_stop(_host);
+ tmio_mmc_reset(_host);
+
+ ret = platform_get_irq(pdev, 0);
+ if (ret < 0)
+ goto unmap_ctl;
+
+ _host->irq = ret;
+
+ tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
+ if (pdata->flags & TMIO_MMC_SDIO_IRQ)
+ tmio_mmc_enable_sdio_irq(mmc, 0);
+
+ ret = request_irq(_host->irq, tmio_mmc_irq, IRQF_DISABLED |
+ IRQF_TRIGGER_FALLING, dev_name(&pdev->dev), _host);
+ if (ret)
+ goto unmap_ctl;
+
+ spin_lock_init(&_host->lock);
+
+ /* Init delayed work for request timeouts */
+ INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
+
+ /* See if we also get DMA */
+ tmio_mmc_request_dma(_host, pdata);
+
+ mmc_add_host(mmc);
+
+ /* Unmask the IRQs we want to know about */
+ if (!_host->chan_rx)
+ irq_mask |= TMIO_MASK_READOP;
+ if (!_host->chan_tx)
+ irq_mask |= TMIO_MASK_WRITEOP;
+
+ tmio_mmc_enable_mmc_irqs(_host, irq_mask);
+
+ *host = _host;
+
+ return 0;
+
+unmap_ctl:
+ iounmap(_host->ctl);
+host_free:
+ mmc_free_host(mmc);
+
+ return ret;
+}
+EXPORT_SYMBOL(tmio_mmc_host_probe);
+
+void tmio_mmc_host_remove(struct tmio_mmc_host *host)
+{
+ mmc_remove_host(host->mmc);
+ cancel_delayed_work_sync(&host->delayed_reset_work);
+ tmio_mmc_release_dma(host);
+ free_irq(host->irq, host);
+ iounmap(host->ctl);
+ mmc_free_host(host->mmc);
+}
+EXPORT_SYMBOL(tmio_mmc_host_remove);
+
+MODULE_LICENSE("GPL v2");
--
1.7.2.5
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