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-rw-r--r--target/linux/xburst/patches-2.6.35/054-mmc.patch1102
1 files changed, 1102 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.35/054-mmc.patch b/target/linux/xburst/patches-2.6.35/054-mmc.patch
new file mode 100644
index 0000000000..842dcac4bb
--- /dev/null
+++ b/target/linux/xburst/patches-2.6.35/054-mmc.patch
@@ -0,0 +1,1102 @@
+From 34e75141dfd8edae48030b61741c294fd0f952b1 Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Thu, 15 Jul 2010 20:06:04 +0000
+Subject: [PATCH] MMC: Add support for the controller on JZ4740 SoCs.
+
+Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
+Acked-by: Matt Fleming <matt@console-pimps.org>
+Cc: Andrew Morton <akpm@linux-foundation.org>
+Cc: Matt Fleming <matt@console-pimps.org>
+Cc: linux-mmc@vger.kernel.org
+Cc: linux-mips@linux-mips.org
+Cc: linux-kernel@vger.kernel.org
+Patchwork: https://patchwork.linux-mips.org/patch/1463/
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+---
+ arch/mips/include/asm/mach-jz4740/jz4740_mmc.h | 15 +
+ drivers/mmc/host/Kconfig | 9 +
+ drivers/mmc/host/Makefile | 1 +
+ drivers/mmc/host/jz4740_mmc.c | 1033 ++++++++++++++++++++++++
+ 4 files changed, 1058 insertions(+), 0 deletions(-)
+ create mode 100644 arch/mips/include/asm/mach-jz4740/jz4740_mmc.h
+ create mode 100644 drivers/mmc/host/jz4740_mmc.c
+
+--- /dev/null
++++ b/arch/mips/include/asm/mach-jz4740/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
+--- a/drivers/mmc/host/Kconfig
++++ b/drivers/mmc/host/Kconfig
+@@ -457,3 +457,12 @@ config MMC_SH_MMCIF
+ This selects the MMC Host Interface controler (MMCIF).
+
+ This driver supports MMCIF in sh7724/sh7757/sh7372.
++
++config MMC_JZ4740
++ tristate "JZ4740 SD/Multimedia Card Interface support"
++ depends on MACH_JZ4740
++ help
++ This selects support for the SD/MMC controller on Ingenic JZ4740
++ SoCs.
++ If you have a board based on such a SoC and with a SD/MMC slot,
++ say Y or M here.
+--- a/drivers/mmc/host/Makefile
++++ b/drivers/mmc/host/Makefile
+@@ -37,6 +37,7 @@ obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc
+ obj-$(CONFIG_GPIOMMC) += gpiommc.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
+--- /dev/null
++++ b/drivers/mmc/host/jz4740_mmc.c
+@@ -0,0 +1,1033 @@
++/*
++ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.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/bitops.h>
++#include <linux/gpio.h>
++#include <asm/mach-jz4740/gpio.h>
++#include <asm/cacheflush.h>
++#include <linux/dma-mapping.h>
++
++#include <asm/mach-jz4740/jz4740_mmc.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
++
++enum jz4740_mmc_state {
++ JZ4740_MMC_STATE_READ_RESPONSE,
++ JZ4740_MMC_STATE_TRANSFER_DATA,
++ JZ4740_MMC_STATE_SEND_STOP,
++ JZ4740_MMC_STATE_DONE,
++};
++
++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;
++
++ uint32_t cmdat;
++
++ uint16_t irq_mask;
++
++ spinlock_t lock;
++
++ struct timer_list timeout_timer;
++ struct sg_mapping_iter miter;
++ enum jz4740_mmc_state state;
++};
++
++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;
++ unsigned int timeout = 1000;
++
++ 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 && --timeout);
++}
++
++static void jz4740_mmc_reset(struct jz4740_mmc_host *host)
++{
++ uint32_t status;
++ unsigned int timeout = 1000;
++
++ 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 && --timeout);
++}
++
++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 unsigned int jz4740_mmc_poll_irq(struct jz4740_mmc_host *host,
++ unsigned int irq)
++{
++ unsigned int timeout = 0x800;
++ uint16_t status;
++
++ do {
++ status = readw(host->base + JZ_REG_MMC_IREG);
++ } while (!(status & irq) && --timeout);
++
++ if (timeout == 0) {
++ set_bit(0, &host->waiting);
++ mod_timer(&host->timeout_timer, jiffies + 5*HZ);
++ jz4740_mmc_set_irq_enabled(host, irq, true);
++ return true;
++ }
++
++ return false;
++}
++
++static void jz4740_mmc_transfer_check_state(struct jz4740_mmc_host *host,
++ struct mmc_data *data)
++{
++ int status;
++
++ 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;
++ }
++ }
++}
++
++static bool jz4740_mmc_write_data(struct jz4740_mmc_host *host,
++ struct mmc_data *data)
++{
++ struct sg_mapping_iter *miter = &host->miter;
++ void __iomem *fifo_addr = host->base + JZ_REG_MMC_TXFIFO;
++ uint32_t *buf;
++ bool timeout;
++ size_t i, j;
++
++ while (sg_miter_next(miter)) {
++ buf = miter->addr;
++ i = miter->length / 4;
++ j = i / 8;
++ i = i & 0x7;
++ while (j) {
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
++ if (unlikely(timeout))
++ goto poll_timeout;
++
++ writel(buf[0], fifo_addr);
++ writel(buf[1], fifo_addr);
++ writel(buf[2], fifo_addr);
++ writel(buf[3], fifo_addr);
++ writel(buf[4], fifo_addr);
++ writel(buf[5], fifo_addr);
++ writel(buf[6], fifo_addr);
++ writel(buf[7], fifo_addr);
++ buf += 8;
++ --j;
++ }
++ if (unlikely(i)) {
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_TXFIFO_WR_REQ);
++ if (unlikely(timeout))
++ goto poll_timeout;
++
++ while (i) {
++ writel(*buf, fifo_addr);
++ ++buf;
++ --i;
++ }
++ }
++ data->bytes_xfered += miter->length;
++ }
++ sg_miter_stop(miter);
++
++ return false;
++
++poll_timeout:
++ miter->consumed = (void *)buf - miter->addr;
++ data->bytes_xfered += miter->consumed;
++ sg_miter_stop(miter);
++
++ return true;
++}
++
++static bool jz4740_mmc_read_data(struct jz4740_mmc_host *host,
++ struct mmc_data *data)
++{
++ struct sg_mapping_iter *miter = &host->miter;
++ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RXFIFO;
++ uint32_t *buf;
++ uint32_t d;
++ uint16_t status;
++ size_t i, j;
++ unsigned int timeout;
++
++ while (sg_miter_next(miter)) {
++ buf = miter->addr;
++ i = miter->length;
++ j = i / 32;
++ i = i & 0x1f;
++ while (j) {
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
++ if (unlikely(timeout))
++ goto poll_timeout;
++
++ buf[0] = readl(fifo_addr);
++ buf[1] = readl(fifo_addr);
++ buf[2] = readl(fifo_addr);
++ buf[3] = readl(fifo_addr);
++ buf[4] = readl(fifo_addr);
++ buf[5] = readl(fifo_addr);
++ buf[6] = readl(fifo_addr);
++ buf[7] = readl(fifo_addr);
++
++ buf += 8;
++ --j;
++ }
++
++ if (unlikely(i)) {
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_RXFIFO_RD_REQ);
++ if (unlikely(timeout))
++ goto poll_timeout;
++
++ while (i >= 4) {
++ *buf++ = readl(fifo_addr);
++ i -= 4;
++ }
++ if (unlikely(i > 0)) {
++ d = readl(fifo_addr);
++ 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);
++
++ /* For whatever reason there is sometime one word more in the fifo then
++ * requested */
++ timeout = 1000;
++ status = readl(host->base + JZ_REG_MMC_STATUS);
++ while (!(status & JZ_MMC_STATUS_DATA_FIFO_EMPTY) && --timeout) {
++ d = readl(fifo_addr);
++ status = readl(host->base + JZ_REG_MMC_STATUS);
++ }
++
++ return false;
++
++poll_timeout:
++ miter->consumed = (void *)buf - miter->addr;
++ data->bytes_xfered += miter->consumed;
++ sg_miter_stop(miter);
++
++ return true;
++}
++
++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;
++ void __iomem *fifo_addr = host->base + JZ_REG_MMC_RESP_FIFO;
++
++ if (cmd->flags & MMC_RSP_136) {
++ tmp = readw(fifo_addr);
++ for (i = 0; i < 4; ++i) {
++ cmd->resp[i] = tmp << 24;
++ tmp = readw(fifo_addr);
++ cmd->resp[i] |= tmp << 8;
++ tmp = readw(fifo_addr);
++ cmd->resp[i] |= tmp >> 8;
++ }
++ } else {
++ cmd->resp[0] = readw(fifo_addr) << 24;
++ cmd->resp[0] |= readw(fifo_addr) << 8;
++ cmd->resp[0] |= readw(fifo_addr) & 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 void jz_mmc_prepare_data_transfer(struct jz4740_mmc_host *host)
++{
++ struct mmc_command *cmd = host->req->cmd;
++ struct mmc_data *data = cmd->data;
++ int direction;
++
++ if (data->flags & MMC_DATA_READ)
++ direction = SG_MITER_TO_SG;
++ else
++ direction = SG_MITER_FROM_SG;
++
++ sg_miter_start(&host->miter, data->sg, data->sg_len, direction);
++}
++
++
++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;
++ bool timeout = false;
++
++ if (cmd->error)
++ host->state = JZ4740_MMC_STATE_DONE;
++
++ switch (host->state) {
++ case JZ4740_MMC_STATE_READ_RESPONSE:
++ if (cmd->flags & MMC_RSP_PRESENT)
++ jz4740_mmc_read_response(host, cmd);
++
++ if (!cmd->data)
++ break;
++
++ jz_mmc_prepare_data_transfer(host);
++
++ case JZ4740_MMC_STATE_TRANSFER_DATA:
++ if (cmd->data->flags & MMC_DATA_READ)
++ timeout = jz4740_mmc_read_data(host, cmd->data);
++ else
++ timeout = jz4740_mmc_write_data(host, cmd->data);
++
++ if (unlikely(timeout)) {
++ host->state = JZ4740_MMC_STATE_TRANSFER_DATA;
++ break;
++ }
++
++ jz4740_mmc_transfer_check_state(host, cmd->data);
++
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_DATA_TRAN_DONE);
++ if (unlikely(timeout)) {
++ host->state = JZ4740_MMC_STATE_SEND_STOP;
++ break;
++ }
++ writew(JZ_MMC_IRQ_DATA_TRAN_DONE, host->base + JZ_REG_MMC_IREG);
++
++ case JZ4740_MMC_STATE_SEND_STOP:
++ if (!req->stop)
++ break;
++
++ jz4740_mmc_send_command(host, req->stop);
++
++ timeout = jz4740_mmc_poll_irq(host, JZ_MMC_IRQ_PRG_DONE);
++ if (timeout) {
++ host->state = JZ4740_MMC_STATE_DONE;
++ break;
++ }
++ case JZ4740_MMC_STATE_DONE:
++ break;
++ }
++
++ if (!timeout)
++ jz4740_mmc_request_done(host);
++
++ return IRQ_HANDLED;
++}
++
++static irqreturn_t jz_mmc_irq(int irq, void *devid)
++{
++ struct jz4740_mmc_host *host = devid;
++ struct mmc_command *cmd = host->cmd;
++ uint16_t irq_reg, status, tmp;
++
++ 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);
++ irq_reg &= ~JZ_MMC_IRQ_SDIO;
++ }
++
++ if (host->req && cmd && irq_reg) {
++ 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) {
++ cmd->error = -ETIMEDOUT;
++ } else if (status & JZ_MMC_STATUS_CRC_RES_ERR) {
++ cmd->error = -EIO;
++ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
++ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
++ if (cmd->data)
++ cmd->data->error = -EIO;
++ cmd->error = -EIO;
++ } else if (status & (JZ_MMC_STATUS_CRC_READ_ERROR |
++ JZ_MMC_STATUS_CRC_WRITE_ERROR)) {
++ if (cmd->data)
++ cmd->data->error = -EIO;
++ cmd->error = -EIO;
++ }
++
++ jz4740_mmc_set_irq_enabled(host, irq_reg, false);
++ writew(irq_reg, host->base + JZ_REG_MMC_IREG);
++
++ return IRQ_WAKE_THREAD;
++ }
++ }
++
++ return IRQ_HANDLED;
++}
++
++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);
++
++ host->state = JZ4740_MMC_STATE_READ_RESPONSE;
++ 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 / 2);
++
++ 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_gpio(struct device *dev, int gpio,
++ const char *name, bool output, int value)
++{
++ int ret;
++
++ if (!gpio_is_valid(gpio))
++ return 0;
++
++ ret = gpio_request(gpio, name);
++ if (ret) {
++ dev_err(dev, "Failed to request %s gpio: %d\n", name, ret);
++ return ret;
++ }
++
++ if (output)
++ gpio_direction_output(gpio, value);
++ else
++ gpio_direction_input(gpio);
++
++ return 0;
++}
++
++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;
++
++ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_card_detect,
++ "MMC detect change", false, 0);
++ if (ret)
++ goto err;
++
++ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_read_only,
++ "MMC read only", false, 0);
++ if (ret)
++ goto err_free_gpio_card_detect;
++
++ ret = jz4740_mmc_request_gpio(&pdev->dev, pdata->gpio_power,
++ "MMC read only", true, pdata->power_active_low);
++ if (ret)
++ goto err_free_gpio_read_only;
++
++ 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 int __devinit jz4740_mmc_request_cd_irq(struct platform_device *pdev,
++ struct jz4740_mmc_host *host)
++{
++ int ret;
++ struct jz4740_mmc_platform_data *pdata = pdev->dev.platform_data;
++
++ if (gpio_is_valid(pdata->gpio_card_detect))
++ return 0;
++
++ host->card_detect_irq = gpio_to_irq(pdata->gpio_card_detect);
++
++ if (host->card_detect_irq < 0) {
++ dev_warn(&pdev->dev, "Failed to get card detect irq\n");
++ return 0;
++ }
++ return request_irq(host->card_detect_irq, jz4740_mmc_card_detect_irq,
++ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
++ "MMC card detect", host);
++
++
++ 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;
++ spin_lock_init(&host->lock);
++ host->irq_mask = 0xffff;
++
++ ret = jz4740_mmc_request_cd_irq(pdev, host);
++ if (ret) {
++ dev_err(&pdev->dev, "Failed to request card detect irq\n");
++ 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 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@metafoo.de>");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 05:08:24 +0000