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Message-Id: <1277688041-23522-1-git-send-email-lars@metafoo.de>
Date: Mon, 28 Jun 2010 03:20:41 +0200
From: Lars-Peter Clausen <lars@...afoo.de>
To: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
Lars-Peter Clausen <lars@...afoo.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Matt Fleming <matt@...sole-pimps.org>,
linux-mmc@...r.kernel.org
Subject: [PATCH v3] MMC: Add JZ4740 mmc driver
This patch adds support for the mmc controller on JZ4740 SoCs.
Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Matt Fleming <matt@...sole-pimps.org>
Cc: linux-mmc@...r.kernel.org
---
Changes since v1
- Do not request IRQ with IRQF_DISABLED since it is a noop now
- Use a generous slack for the timeout timer. It does not need to be accurate.
Changes since v2
- Use sg_mapping_to iterate over sg elements in mmc read and write functions
- Use bitops instead of a spinlock and a variable for testing whether a request
has been finished.
- Rework irq and timeout handling in order to get rid of locking in hot paths
---
drivers/mmc/host/Kconfig | 8 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/jz4740_mmc.c | 969 ++++++++++++++++++++++++++++++++++++++++
include/linux/mmc/jz4740_mmc.h | 15 +
4 files changed, 993 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/jz4740_mmc.c
create mode 100644 include/linux/mmc/jz4740_mmc.h
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index f06d06e..546fc49 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -81,6 +81,14 @@ config MMC_RICOH_MMC
If unsure, say Y.
+config MMC_JZ4740
+ tristate "JZ4740 SD/Multimedia Card Interface support"
+ depends on MACH_JZ4740
+ help
+ This selects the Ingenic Z4740 SD/Multimedia card Interface.
+ If you have an ngenic platform with a Multimedia Card slot,
+ say Y or M here.
+
config MMC_SDHCI_OF
tristate "SDHCI support on OpenFirmware platforms"
depends on MMC_SDHCI && PPC_OF
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index e30c2ee..f4e53c9 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc.o
obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
+obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
obj-$(CONFIG_MMC_SDHCI_OF) += sdhci-of.o
sdhci-of-y := sdhci-of-core.o
diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c
new file mode 100644
index 0000000..b34f25b
--- /dev/null
+++ b/drivers/mmc/host/jz4740_mmc.c
@@ -0,0 +1,969 @@
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@...afoo.de>
+ * JZ4740 SD/MMC controller driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/mmc/host.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/clk.h>
+#include <linux/mmc/jz4740_mmc.h>
+
+#include <linux/bitops.h>
+#include <linux/gpio.h>
+#include <asm/mach-jz4740/gpio.h>
+#include <asm/cacheflush.h>
+#include <linux/dma-mapping.h>
+
+
+#define JZ_REG_MMC_STRPCL 0x00
+#define JZ_REG_MMC_STATUS 0x04
+#define JZ_REG_MMC_CLKRT 0x08
+#define JZ_REG_MMC_CMDAT 0x0C
+#define JZ_REG_MMC_RESTO 0x10
+#define JZ_REG_MMC_RDTO 0x14
+#define JZ_REG_MMC_BLKLEN 0x18
+#define JZ_REG_MMC_NOB 0x1C
+#define JZ_REG_MMC_SNOB 0x20
+#define JZ_REG_MMC_IMASK 0x24
+#define JZ_REG_MMC_IREG 0x28
+#define JZ_REG_MMC_CMD 0x2C
+#define JZ_REG_MMC_ARG 0x30
+#define JZ_REG_MMC_RESP_FIFO 0x34
+#define JZ_REG_MMC_RXFIFO 0x38
+#define JZ_REG_MMC_TXFIFO 0x3C
+
+#define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
+#define JZ_MMC_STRPCL_EXIT_TRANSFER BIT(6)
+#define JZ_MMC_STRPCL_START_READWAIT BIT(5)
+#define JZ_MMC_STRPCL_STOP_READWAIT BIT(4)
+#define JZ_MMC_STRPCL_RESET BIT(3)
+#define JZ_MMC_STRPCL_START_OP BIT(2)
+#define JZ_MMC_STRPCL_CLOCK_CONTROL (BIT(1) | BIT(0))
+#define JZ_MMC_STRPCL_CLOCK_STOP BIT(0)
+#define JZ_MMC_STRPCL_CLOCK_START BIT(1)
+
+
+#define JZ_MMC_STATUS_IS_RESETTING BIT(15)
+#define JZ_MMC_STATUS_SDIO_INT_ACTIVE BIT(14)
+#define JZ_MMC_STATUS_PRG_DONE BIT(13)
+#define JZ_MMC_STATUS_DATA_TRAN_DONE BIT(12)
+#define JZ_MMC_STATUS_END_CMD_RES BIT(11)
+#define JZ_MMC_STATUS_DATA_FIFO_AFULL BIT(10)
+#define JZ_MMC_STATUS_IS_READWAIT BIT(9)
+#define JZ_MMC_STATUS_CLK_EN BIT(8)
+#define JZ_MMC_STATUS_DATA_FIFO_FULL BIT(7)
+#define JZ_MMC_STATUS_DATA_FIFO_EMPTY BIT(6)
+#define JZ_MMC_STATUS_CRC_RES_ERR BIT(5)
+#define JZ_MMC_STATUS_CRC_READ_ERROR BIT(4)
+#define JZ_MMC_STATUS_TIMEOUT_WRITE BIT(3)
+#define JZ_MMC_STATUS_CRC_WRITE_ERROR BIT(2)
+#define JZ_MMC_STATUS_TIMEOUT_RES BIT(1)
+#define JZ_MMC_STATUS_TIMEOUT_READ BIT(0)
+
+#define JZ_MMC_STATUS_READ_ERROR_MASK (BIT(4) | BIT(0))
+#define JZ_MMC_STATUS_WRITE_ERROR_MASK (BIT(3) | BIT(2))
+
+
+#define JZ_MMC_CMDAT_IO_ABORT BIT(11)
+#define JZ_MMC_CMDAT_BUS_WIDTH_4BIT BIT(10)
+#define JZ_MMC_CMDAT_DMA_EN BIT(8)
+#define JZ_MMC_CMDAT_INIT BIT(7)
+#define JZ_MMC_CMDAT_BUSY BIT(6)
+#define JZ_MMC_CMDAT_STREAM BIT(5)
+#define JZ_MMC_CMDAT_WRITE BIT(4)
+#define JZ_MMC_CMDAT_DATA_EN BIT(3)
+#define JZ_MMC_CMDAT_RESPONSE_FORMAT (BIT(2) | BIT(1) | BIT(0))
+#define JZ_MMC_CMDAT_RSP_R1 1
+#define JZ_MMC_CMDAT_RSP_R2 2
+#define JZ_MMC_CMDAT_RSP_R3 3
+
+#define JZ_MMC_IRQ_SDIO BIT(7)
+#define JZ_MMC_IRQ_TXFIFO_WR_REQ BIT(6)
+#define JZ_MMC_IRQ_RXFIFO_RD_REQ BIT(5)
+#define JZ_MMC_IRQ_END_CMD_RES BIT(2)
+#define JZ_MMC_IRQ_PRG_DONE BIT(1)
+#define JZ_MMC_IRQ_DATA_TRAN_DONE BIT(0)
+
+
+#define JZ_MMC_CLK_RATE 24000000
+
+#define JZ4740_MMC_MAX_TIMEOUT 10000000
+
+struct jz4740_mmc_host {
+ struct mmc_host *mmc;
+ struct platform_device *pdev;
+ struct jz4740_mmc_platform_data *pdata;
+ struct clk *clk;
+
+ int irq;
+ int card_detect_irq;
+
+ struct resource *mem;
+ void __iomem *base;
+ struct mmc_request *req;
+ struct mmc_command *cmd;
+
+ unsigned long waiting;
+
+ int max_clock;
+ uint32_t cmdat;
+
+ uint16_t irq_mask;
+
+ spinlock_t lock;
+
+ struct timer_list timeout_timer;
+};
+
+static void jz4740_mmc_set_irq_enabled(struct jz4740_mmc_host *host,
+ unsigned int irq, bool enabled)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ if (enabled)
+ host->irq_mask &= ~irq;
+ else
+ host->irq_mask |= irq;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ writew(host->irq_mask, host->base + JZ_REG_MMC_IMASK);
+}
+
+static void jz4740_mmc_clock_enable(struct jz4740_mmc_host *host,
+ bool start_transfer)
+{
+ uint16_t val = JZ_MMC_STRPCL_CLOCK_START;
+
+ if (start_transfer)
+ val |= JZ_MMC_STRPCL_START_OP;
+
+ writew(val, host->base + JZ_REG_MMC_STRPCL);
+}
+
+static void jz4740_mmc_clock_disable(struct jz4740_mmc_host *host)
+{
+ uint32_t status;
+
+ writew(JZ_MMC_STRPCL_CLOCK_STOP, host->base + JZ_REG_MMC_STRPCL);
+ do {
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ } while (status & JZ_MMC_STATUS_CLK_EN);
+}
+
+static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
+{
+ uint32_t status;
+
+ writew(JZ_MMC_STRPCL_RESET, host->base + JZ_REG_MMC_STRPCL);
+ udelay(10);
+ do {
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ } while (status & JZ_MMC_STATUS_IS_RESETTING);
+}
+
+static void jz4740_mmc_request_done(struct jz4740_mmc_host *host)
+{
+ struct mmc_request *req;
+
+ req = host->req;
+ host->req = NULL;
+
+ mmc_request_done(host->mmc, req);
+}
+
+static inline unsigned int jz4740_mmc_wait_irq(struct jz4740_mmc_host *host,
+ unsigned int irq)
+{
+ unsigned int timeout = JZ4740_MMC_MAX_TIMEOUT;
+ uint16_t status;
+
+ do {
+ status = readw(host->base + JZ_REG_MMC_IREG);
+ } while (!(status & irq) && --timeout);
+
+ return timeout;
+}
+
+static void jz4740_mmc_write_data(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct sg_mapping_iter miter;
+ uint32_t *buf;
+ int status;
+ unsigned int timeout;
+ size_t i, j;
+
+ sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_FROM_SG);
+ while (sg_miter_next(&miter)) {
+ buf = miter.addr;
+ i = miter.length / 4;
+ j = i >> 3;
+ i = i & 0x7;
+ while (j) {
+ timeout = jz4740_mmc_wait_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
+ if (unlikely(timeout == 0)) {
+ sg_miter_stop(&miter);
+ goto err_timeout;
+ }
+
+ writel(buf[0], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[1], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[2], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[3], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[4], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[5], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[6], host->base + JZ_REG_MMC_TXFIFO);
+ writel(buf[7], host->base + JZ_REG_MMC_TXFIFO);
+ buf += 8;
+ --j;
+ }
+ if (unlikely(i)) {
+ timeout = jz4740_mmc_wait_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
+ if (unlikely(timeout == 0)) {
+ sg_miter_stop(&miter);
+ goto err_timeout;
+ }
+
+ while (i) {
+ writel(*buf, host->base + JZ_REG_MMC_TXFIFO);
+ ++buf;
+ --i;
+ }
+ }
+ data->bytes_xfered += miter.length;
+ }
+ sg_miter_stop(&miter);
+
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ if (status & JZ_MMC_STATUS_WRITE_ERROR_MASK) {
+ if (status & (JZ_MMC_STATUS_TIMEOUT_WRITE)) {
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+ } else {
+ host->req->cmd->error = -EIO;
+ data->error = -EIO;
+ }
+ return;
+ }
+
+ timeout = JZ4740_MMC_MAX_TIMEOUT;
+ do {
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ } while ((status & JZ_MMC_STATUS_DATA_TRAN_DONE) == 0 && --timeout);
+
+ if (unlikely(timeout == 0))
+ goto err_timeout;
+ writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
+
+ return;
+
+err_timeout:
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+}
+
+static void jz4740_mmc_read_data(struct jz4740_mmc_host *host,
+ struct mmc_data *data)
+{
+ struct sg_mapping_iter miter;
+ uint32_t *buf;
+ uint32_t d;
+ uint16_t status = 0;
+ size_t i, j;
+ unsigned int timeout;
+
+ sg_miter_start(&miter, data->sg, data->sg_len, SG_MITER_TO_SG);
+ while (sg_miter_next(&miter)) {
+ buf = miter.addr;
+ i = miter.length;
+ j = i >> 5;
+ i = i & 0x1f;
+ while (j) {
+ timeout = jz4740_mmc_wait_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
+ if (unlikely(timeout == 0)) {
+ sg_miter_stop(&miter);
+ goto err_timeout;
+ }
+
+ buf[0] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[1] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[2] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[3] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[4] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[5] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[6] = readl(host->base + JZ_REG_MMC_RXFIFO);
+ buf[7] = readl(host->base + JZ_REG_MMC_RXFIFO);
+
+ buf += 8;
+ --j;
+ }
+
+ while (i >= 4) {
+ timeout = jz4740_mmc_wait_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
+ if (unlikely(timeout == 0)) {
+ sg_miter_stop(&miter);
+ goto err_timeout;
+ }
+
+ *buf++ = readl(host->base + JZ_REG_MMC_RXFIFO);
+ i -= 4;
+ }
+ if (unlikely(i > 0)) {
+ d = readl(host->base + JZ_REG_MMC_RXFIFO);
+ memcpy(buf, &d, i);
+ }
+ data->bytes_xfered += miter.length;
+
+ /* This can go away once MIPS implements flush_kernel_dcache_page */
+ flush_dcache_page(miter.page);
+ }
+ sg_miter_stop(&miter);
+
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ if (status & JZ_MMC_STATUS_READ_ERROR_MASK) {
+ if (status & JZ_MMC_STATUS_TIMEOUT_READ) {
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+ } else {
+ host->req->cmd->error = -EIO;
+ data->error = -EIO;
+ }
+ return;
+ }
+
+ /* For whatever reason there is sometime one word more in the fifo then
+ * requested */
+ while ((status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) == 0 && --timeout) {
+ d = readl(host->base + JZ_REG_MMC_RXFIFO);
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+ }
+ return;
+
+err_timeout:
+ host->req->cmd->error = -ETIMEDOUT;
+ data->error = -ETIMEDOUT;
+}
+
+static void jz4740_mmc_timeout(unsigned long data)
+{
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)data;
+
+ if (!test_and_clear_bit(0, &host->waiting))
+ return;
+
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
+
+ host->req->cmd->error = -ETIMEDOUT;
+ jz4740_mmc_request_done(host);
+}
+
+static void jz4740_mmc_read_response(struct jz4740_mmc_host *host,
+ struct mmc_command *cmd)
+{
+ int i;
+ uint16_t tmp;
+
+ if (cmd->flags & MMC_RSP_136) {
+ tmp = readw(host->base + JZ_REG_MMC_RESP_FIFO);
+ for (i = 0; i < 4; ++i) {
+ cmd->resp[i] = tmp << 24;
+ cmd->resp[i] |= readw(host->base + JZ_REG_MMC_RESP_FIFO) << 8;
+ tmp = readw(host->base + JZ_REG_MMC_RESP_FIFO);
+ cmd->resp[i] |= tmp >> 8;
+ }
+ } else {
+ cmd->resp[0] = readw(host->base + JZ_REG_MMC_RESP_FIFO) << 24;
+ cmd->resp[0] |= readw(host->base + JZ_REG_MMC_RESP_FIFO) << 8;
+ cmd->resp[0] |= readw(host->base + JZ_REG_MMC_RESP_FIFO) & 0xff;
+ }
+}
+
+static void jz4740_mmc_send_command(struct jz4740_mmc_host *host,
+ struct mmc_command *cmd)
+{
+ uint32_t cmdat = host->cmdat;
+
+ host->cmdat &= ~JZ_MMC_CMDAT_INIT;
+ jz4740_mmc_clock_disable(host);
+
+ host->cmd = cmd;
+
+ if (cmd->flags & MMC_RSP_BUSY)
+ cmdat |= JZ_MMC_CMDAT_BUSY;
+
+ switch (mmc_resp_type(cmd)) {
+ case MMC_RSP_R1B:
+ case MMC_RSP_R1:
+ cmdat |= JZ_MMC_CMDAT_RSP_R1;
+ break;
+ case MMC_RSP_R2:
+ cmdat |= JZ_MMC_CMDAT_RSP_R2;
+ break;
+ case MMC_RSP_R3:
+ cmdat |= JZ_MMC_CMDAT_RSP_R3;
+ break;
+ default:
+ break;
+ }
+
+ if (cmd->data) {
+ cmdat |= JZ_MMC_CMDAT_DATA_EN;
+ if (cmd->data->flags & MMC_DATA_WRITE)
+ cmdat |= JZ_MMC_CMDAT_WRITE;
+ if (cmd->data->flags & MMC_DATA_STREAM)
+ cmdat |= JZ_MMC_CMDAT_STREAM;
+
+ writew(cmd->data->blksz, host->base + JZ_REG_MMC_BLKLEN);
+ writew(cmd->data->blocks, host->base + JZ_REG_MMC_NOB);
+ }
+
+ writeb(cmd->opcode, host->base + JZ_REG_MMC_CMD);
+ writel(cmd->arg, host->base + JZ_REG_MMC_ARG);
+ writel(cmdat, host->base + JZ_REG_MMC_CMDAT);
+
+ jz4740_mmc_clock_enable(host, 1);
+}
+
+
+static irqreturn_t jz_mmc_irq_worker(int irq, void *devid)
+{
+ struct jz4740_mmc_host *host = (struct jz4740_mmc_host *)devid;
+ struct mmc_command *cmd = host->req->cmd;
+ struct mmc_request *req = host->req;
+ unsigned int timeout = JZ4740_MMC_MAX_TIMEOUT;
+ uint32_t status;
+
+ if (cmd->error)
+ goto done;
+
+ if (cmd->flags & MMC_RSP_PRESENT)
+ jz4740_mmc_read_response(host, cmd);
+
+ if (cmd->data) {
+ if (cmd->data->flags & MMC_DATA_READ)
+ jz4740_mmc_read_data(host, cmd->data);
+ else
+ jz4740_mmc_write_data(host, cmd->data);
+ }
+
+ if (req->stop) {
+ jz4740_mmc_send_command(host, req->stop);
+ do {
+ status = readw(host->base + JZ_REG_MMC_IREG);
+ } while ((status & JZ_MMC_IRQ_PRG_DONE) == 0 && --timeout);
+ writew(JZ_MMC_IRQ_PRG_DONE, host->base + JZ_REG_MMC_IREG);
+ }
+
+ if (unlikely(timeout == 0))
+ req->stop->error = -ETIMEDOUT;
+
+done:
+ jz4740_mmc_request_done(host);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t jz_mmc_irq(int irq, void *devid)
+{
+ struct jz4740_mmc_host *host = devid;
+ uint16_t irq_reg, status, tmp;
+ irqreturn_t ret = IRQ_HANDLED;
+
+ irq_reg = readw(host->base + JZ_REG_MMC_IREG);
+
+ tmp = irq_reg;
+ irq_reg &= ~host->irq_mask;
+
+ tmp &= ~(JZ_MMC_IRQ_TXFIFO_WR_REQ | JZ_MMC_IRQ_RXFIFO_RD_REQ |
+ JZ_MMC_IRQ_PRG_DONE | JZ_MMC_IRQ_DATA_TRAN_DONE);
+
+ if (tmp != irq_reg)
+ writew(tmp & ~irq_reg, host->base + JZ_REG_MMC_IREG);
+
+ if (irq_reg & JZ_MMC_IRQ_SDIO) {
+ writew(JZ_MMC_IRQ_SDIO, host->base + JZ_REG_MMC_IREG);
+ mmc_signal_sdio_irq(host->mmc);
+ }
+
+ if (!host->req || !host->cmd)
+ goto handled;
+
+ if (!(irq_reg & JZ_MMC_IRQ_END_CMD_RES))
+ goto handled;
+
+ if (test_and_clear_bit(0, &host->waiting)) {
+ del_timer(&host->timeout_timer);
+
+ status = readl(host->base + JZ_REG_MMC_STATUS);
+
+ if (status & JZ_MMC_STATUS_TIMEOUT_RES) {
+ host->cmd->error = -ETIMEDOUT;
+ } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
+ host->cmd->error = -EIO;
+ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
+ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
+ host->cmd->data->error = -EIO;
+ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
+ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
+ host->cmd->data->error = -EIO;
+ }
+
+ ret = IRQ_WAKE_THREAD;
+ }
+
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, false);
+ writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
+
+handled:
+ return ret;
+}
+
+static int jz4740_mmc_set_clock_rate(struct jz4740_mmc_host *host, int rate)
+{
+ int div = 0;
+ int real_rate;
+
+ jz4740_mmc_clock_disable(host);
+ clk_set_rate(host->clk, JZ_MMC_CLK_RATE);
+
+ real_rate = clk_get_rate(host->clk);
+
+ while (real_rate > rate && div < 7) {
+ ++div;
+ real_rate >>= 1;
+ }
+
+ writew(div, host->base + JZ_REG_MMC_CLKRT);
+ return real_rate;
+}
+
+static void jz4740_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+
+ host->req = req;
+
+ writew(0xffff, host->base + JZ_REG_MMC_IREG);
+
+ writew(JZ_MMC_IRQ_END_CMD_RES, host->base + JZ_REG_MMC_IREG);
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_END_CMD_RES, true);
+
+ set_bit(0, &host->waiting);
+ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
+ jz4740_mmc_send_command(host, req->cmd);
+}
+
+static void jz4740_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ if (ios->clock)
+ jz4740_mmc_set_clock_rate(host, ios->clock);
+
+ switch (ios->power_mode) {
+ case MMC_POWER_UP:
+ jz4740_mmc_reset(host);
+ if (gpio_is_valid(host->pdata->gpio_power))
+ gpio_set_value(host->pdata->gpio_power,
+ !host->pdata->power_active_low);
+ host->cmdat |= JZ_MMC_CMDAT_INIT;
+ clk_enable(host->clk);
+ break;
+ case MMC_POWER_ON:
+ break;
+ default:
+ if (gpio_is_valid(host->pdata->gpio_power))
+ gpio_set_value(host->pdata->gpio_power,
+ host->pdata->power_active_low);
+ clk_disable(host->clk);
+ break;
+ }
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ host->cmdat &= ~JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
+ break;
+ case MMC_BUS_WIDTH_4:
+ host->cmdat |= JZ_MMC_CMDAT_BUS_WIDTH_4BIT;
+ break;
+ default:
+ break;
+ }
+}
+
+static int jz4740_mmc_get_ro(struct mmc_host *mmc)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ if (!gpio_is_valid(host->pdata->gpio_read_only))
+ return -ENOSYS;
+
+ return gpio_get_value(host->pdata->gpio_read_only) ^
+ host->pdata->read_only_active_low;
+}
+
+static int jz4740_mmc_get_cd(struct mmc_host *mmc)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ if (!gpio_is_valid(host->pdata->gpio_card_detect))
+ return -ENOSYS;
+
+ return gpio_get_value(host->pdata->gpio_card_detect) ^
+ host->pdata->card_detect_active_low;
+}
+
+static irqreturn_t jz4740_mmc_card_detect_irq(int irq, void *devid)
+{
+ struct jz4740_mmc_host *host = devid;
+
+ mmc_detect_change(host->mmc, HZ / 3);
+
+ return IRQ_HANDLED;
+}
+
+static void jz4740_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct jz4740_mmc_host *host = mmc_priv(mmc);
+ jz4740_mmc_set_irq_enabled(host, JZ_MMC_IRQ_SDIO, enable);
+}
+
+static const struct mmc_host_ops jz4740_mmc_ops = {
+ .request = jz4740_mmc_request,
+ .set_ios = jz4740_mmc_set_ios,
+ .get_ro = jz4740_mmc_get_ro,
+ .get_cd = jz4740_mmc_get_cd,
+ .enable_sdio_irq = jz4740_mmc_enable_sdio_irq,
+};
+
+static const struct jz_gpio_bulk_request jz4740_mmc_pins[] = {
+ JZ_GPIO_BULK_PIN(MSC_CMD),
+ JZ_GPIO_BULK_PIN(MSC_CLK),
+ JZ_GPIO_BULK_PIN(MSC_DATA0),
+ JZ_GPIO_BULK_PIN(MSC_DATA1),
+ JZ_GPIO_BULK_PIN(MSC_DATA2),
+ JZ_GPIO_BULK_PIN(MSC_DATA3),
+};
+
+static int __devinit jz4740_mmc_request_gpios(struct platform_device *pdev)
+{
+ int ret;
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return 0;
+
+ if (gpio_is_valid(pdata->gpio_card_detect)) {
+ ret = gpio_request(pdata->gpio_card_detect, "MMC detect change");
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request detect change gpio\n");
+ goto err;
+ }
+ gpio_direction_input(pdata->gpio_card_detect);
+ }
+
+ if (gpio_is_valid(pdata->gpio_read_only)) {
+ ret = gpio_request(pdata->gpio_read_only, "MMC read only");
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request read only gpio: %d\n", ret);
+ goto err_free_gpio_card_detect;
+ }
+ gpio_direction_input(pdata->gpio_read_only);
+ }
+
+ if (gpio_is_valid(pdata->gpio_power)) {
+ ret = gpio_request(pdata->gpio_power, "MMC power");
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request power gpio: %d\n", ret);
+ goto err_free_gpio_read_only;
+ }
+ gpio_direction_output(pdata->gpio_power, pdata->power_active_low);
+ }
+
+ return 0;
+
+err_free_gpio_read_only:
+ if (gpio_is_valid(pdata->gpio_read_only))
+ gpio_free(pdata->gpio_read_only);
+err_free_gpio_card_detect:
+ if (gpio_is_valid(pdata->gpio_card_detect))
+ gpio_free(pdata->gpio_card_detect);
+err:
+ return ret;
+}
+
+static void jz4740_mmc_free_gpios(struct platform_device *pdev)
+{
+ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return;
+
+ if (gpio_is_valid(pdata->gpio_power))
+ gpio_free(pdata->gpio_power);
+ if (gpio_is_valid(pdata->gpio_read_only))
+ gpio_free(pdata->gpio_read_only);
+ if (gpio_is_valid(pdata->gpio_card_detect))
+ gpio_free(pdata->gpio_card_detect);
+}
+
+static inline size_t jz4740_mmc_num_pins(struct jz4740_mmc_host *host)
+{
+ size_t num_pins = ARRAY_SIZE(jz4740_mmc_pins);
+ if (host->pdata && host->pdata->data_1bit)
+ num_pins -= 3;
+
+ return num_pins;
+}
+
+static int __devinit jz4740_mmc_probe(struct platform_device* pdev)
+{
+ int ret;
+ struct mmc_host *mmc;
+ struct jz4740_mmc_host *host;
+ struct jz4740_mmc_platform_data *pdata;
+
+ pdata = pdev->dev.platform_data;
+
+ mmc = mmc_alloc_host(sizeof(struct jz4740_mmc_host), &pdev->dev);
+ if (!mmc) {
+ dev_err(&pdev->dev, "Failed to alloc mmc host structure\n");
+ return -ENOMEM;
+ }
+
+ host = mmc_priv(mmc);
+ host->pdata = pdata;
+
+ host->irq = platform_get_irq(pdev, 0);
+ if (host->irq < 0) {
+ ret = host->irq;
+ dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
+ goto err_free_host;
+ }
+
+ host->clk = clk_get(&pdev->dev, "mmc");
+ if (!host->clk) {
+ ret = -ENOENT;
+ dev_err(&pdev->dev, "Failed to get mmc clock\n");
+ goto err_free_host;
+ }
+
+ host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!host->mem) {
+ ret = -ENOENT;
+ dev_err(&pdev->dev, "Failed to get base platform memory\n");
+ goto err_clk_put;
+ }
+
+ host->mem = request_mem_region(host->mem->start,
+ resource_size(host->mem), pdev->name);
+ if (!host->mem) {
+ ret = -EBUSY;
+ dev_err(&pdev->dev, "Failed to request base memory region\n");
+ goto err_clk_put;
+ }
+
+ host->base = ioremap_nocache(host->mem->start, resource_size(host->mem));
+ if (!host->base) {
+ ret = -EBUSY;
+ dev_err(&pdev->dev, "Failed to ioremap base memory\n");
+ goto err_release_mem_region;
+ }
+
+ ret = jz_gpio_bulk_request(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request mmc pins: %d\n", ret);
+ goto err_iounmap;
+ }
+
+ ret = jz4740_mmc_request_gpios(pdev);
+ if (ret)
+ goto err_gpio_bulk_free;
+
+ mmc->ops = &jz4740_mmc_ops;
+ mmc->f_min = JZ_MMC_CLK_RATE / 128;
+ mmc->f_max = JZ_MMC_CLK_RATE;
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ mmc->caps = (pdata && pdata->data_1bit) ? 0 : MMC_CAP_4_BIT_DATA;
+ mmc->caps |= MMC_CAP_SDIO_IRQ;
+
+ mmc->max_blk_size = (1 << 10) - 1;
+ mmc->max_blk_count = (1 << 15) - 1;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+
+ mmc->max_phys_segs = 128;
+ mmc->max_hw_segs = 128;
+ mmc->max_seg_size = mmc->max_req_size;
+
+ host->mmc = mmc;
+ host->pdev = pdev;
+ host->max_clock = JZ_MMC_CLK_RATE;
+ spin_lock_init(&host->lock);
+ host->irq_mask = 0xffff;
+
+ host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);
+
+ if (host->card_detect_irq < 0) {
+ dev_warn(&pdev->dev, "Failed to get irq for card detect gpio\n");
+ } else {
+ ret = request_irq(host->card_detect_irq,
+ jz4740_mmc_card_detect_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "MMC card detect", host);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request card detect irq");
+ goto err_free_gpios;
+ }
+ }
+
+ ret = request_threaded_irq(host->irq, jz_mmc_irq, jz_mmc_irq_worker, 0,
+ dev_name(&pdev->dev), host);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
+ goto err_free_card_detect_irq;
+ }
+
+ jz4740_mmc_reset(host);
+ jz4740_mmc_clock_disable(host);
+ setup_timer(&host->timeout_timer, jz4740_mmc_timeout,
+ (unsigned long)host);
+ /* It is not that important when it times out, it just needs to timeout. */
+ set_timer_slack(&host->timeout_timer, HZ);
+
+ platform_set_drvdata(pdev, host);
+ ret = mmc_add_host(mmc);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add mmc host: %d\n", ret);
+ goto err_free_irq;
+ }
+ dev_info(&pdev->dev, "JZ SD/MMC card driver registered\n");
+
+ return 0;
+
+err_free_irq:
+ free_irq(host->irq, host);
+err_free_card_detect_irq:
+ if (host->card_detect_irq >= 0)
+ free_irq(host->card_detect_irq, host);
+err_free_gpios:
+ jz4740_mmc_free_gpios(pdev);
+err_gpio_bulk_free:
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+err_iounmap:
+ iounmap(host->base);
+err_release_mem_region:
+ release_mem_region(host->mem->start, resource_size(host->mem));
+err_clk_put:
+ clk_put(host->clk);
+err_free_host:
+ platform_set_drvdata(pdev, NULL);
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+static int __devexit jz4740_mmc_remove(struct platform_device *pdev)
+{
+ struct jz4740_mmc_host *host = platform_get_drvdata(pdev);
+
+ del_timer_sync(&host->timeout_timer);
+ jz4740_mmc_set_irq_enabled(host, 0xff, false);
+ jz4740_mmc_reset(host);
+
+ mmc_remove_host(host->mmc);
+
+ free_irq(host->irq, host);
+ if (host->card_detect_irq >= 0)
+ free_irq(host->card_detect_irq, host);
+
+ jz4740_mmc_free_gpios(pdev);
+ jz_gpio_bulk_free(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ iounmap(host->base);
+ release_mem_region(host->mem->start, resource_size(host->mem));
+
+ clk_put(host->clk);
+
+ platform_set_drvdata(pdev, NULL);
+ mmc_free_host(host->mmc);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int jz4740_mmc_suspend(struct device *dev)
+{
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
+
+ mmc_suspend_host(host->mmc);
+
+ jz_gpio_bulk_suspend(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ return 0;
+}
+
+static int jz4740_mmc_resume(struct device *dev)
+{
+ struct jz4740_mmc_host *host = dev_get_drvdata(dev);
+
+ jz_gpio_bulk_resume(jz4740_mmc_pins, jz4740_mmc_num_pins(host));
+
+ mmc_resume_host(host->mmc);
+
+ return 0;
+}
+
+const struct dev_pm_ops jz4740_mmc_pm_ops = {
+ .suspend = jz4740_mmc_suspend,
+ .resume = jz4740_mmc_resume,
+ .poweroff = jz4740_mmc_suspend,
+ .restore = jz4740_mmc_resume,
+};
+
+#define JZ4740_MMC_PM_OPS (&jz4740_mmc_pm_ops)
+#else
+#define JZ4740_MMC_PM_OPS NULL
+#endif
+
+static struct platform_driver jz4740_mmc_driver = {
+ .probe = jz4740_mmc_probe,
+ .remove = __devexit_p(jz4740_mmc_remove),
+ .driver = {
+ .name = "jz4740-mmc",
+ .owner = THIS_MODULE,
+ .pm = JZ4740_MMC_PM_OPS,
+ },
+};
+
+static int __init jz4740_mmc_init(void)
+{
+ return platform_driver_register(&jz4740_mmc_driver);
+}
+module_init(jz4740_mmc_init);
+
+static void __exit jz4740_mmc_exit(void)
+{
+ platform_driver_unregister(&jz4740_mmc_driver);
+}
+module_exit(jz4740_mmc_exit);
+
+MODULE_DESCRIPTION("JZ4740 SD/MMC controller driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@...afoo.de>");
diff --git a/include/linux/mmc/jz4740_mmc.h b/include/linux/mmc/jz4740_mmc.h
new file mode 100644
index 0000000..8543f43
--- /dev/null
+++ b/include/linux/mmc/jz4740_mmc.h
@@ -0,0 +1,15 @@
+#ifndef __LINUX_MMC_JZ4740_MMC
+#define __LINUX_MMC_JZ4740_MMC
+
+struct jz4740_mmc_platform_data {
+ int gpio_power;
+ int gpio_card_detect;
+ int gpio_read_only;
+ unsigned card_detect_active_low:1;
+ unsigned read_only_active_low:1;
+ unsigned power_active_low:1;
+
+ unsigned data_1bit:1;
+};
+
+#endif
--
1.5.6.5
--
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