* [PATCH v4] dw_mmc: Add Synopsys DesignWare mmc host driver.
2010-12-11 19:23 ` Chris Ball
2010-12-12 8:41 ` Russell King - ARM Linux
2010-12-12 10:57 ` Will Newton
@ 2010-12-16 17:04 ` Will Newton
2011-01-02 6:20 ` Chris Ball
2011-01-18 7:54 ` Jaehoon Chung
2 siblings, 2 replies; 20+ messages in thread
From: Will Newton @ 2010-12-16 17:04 UTC (permalink / raw)
To: linux-arm-kernel
This adds the mmc host driver for the Synopsys DesignWare mmc
host controller, found in a number of embedded SoC designs.
Signed-off-by: Will Newton <will.newton@imgtec.com>
---
drivers/mmc/host/Kconfig | 16 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/dw_mmc.c | 1796 ++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/dw_mmc.h | 168 +++++
include/linux/mmc/dw_mmc.h | 217 ++++++
5 files changed, 2198 insertions(+), 0 deletions(-)
create mode 100644 drivers/mmc/host/dw_mmc.c
create mode 100644 drivers/mmc/host/dw_mmc.h
create mode 100644 include/linux/mmc/dw_mmc.h
- patch v2: make changes based on review by Matt Fleming.
- patch v3: changes based on review by Chris Ball.
- patch v4: make readq use conditional
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index f8fa9ef..e2373a6 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -469,6 +469,22 @@ config SDH_BFIN_MISSING_CMD_PULLUP_WORKAROUND
help
If you say yes here SD-Cards may work on the EZkit.
+config MMC_DW
+ tristate "Synopsys DesignWare Memory Card Interface"
+ depends on ARM
+ help
+ This selects support for the Synopsys DesignWare Mobile Storage IP
+ block, this provides host support for SD and MMC interfaces, in both
+ PIO and external DMA modes.
+
+config MMC_DW_IDMAC
+ bool "Internal DMAC interface"
+ depends on MMC_DW
+ help
+ This selects support for the internal DMAC block within the Synopsys
+ Designware Mobile Storage IP block. This disables the external DMA
+ interface.
+
config MMC_SH_MMCIF
tristate "SuperH Internal MMCIF support"
depends on MMC_BLOCK && (SUPERH || ARCH_SHMOBILE)
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index d91364d..a5d1cb2 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_MMC_TMIO) += tmio_mmc.o
obj-$(CONFIG_MMC_CB710) += cb710-mmc.o
obj-$(CONFIG_MMC_VIA_SDMMC) += via-sdmmc.o
obj-$(CONFIG_SDH_BFIN) += bfin_sdh.o
+obj-$(CONFIG_MMC_DW) += dw_mmc.o
obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
obj-$(CONFIG_MMC_USHC) += ushc.o
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
new file mode 100644
index 0000000..2fcc825
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc.c
@@ -0,0 +1,1796 @@
+/*
+ * Synopsys DesignWare Multimedia Card Interface driver
+ * (Based on NXP driver for lpc 31xx)
+ *
+ * Copyright (C) 2009 NXP Semiconductors
+ * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
+ *
+ * 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.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/dw_mmc.h>
+#include <linux/bitops.h>
+
+#include "dw_mmc.h"
+
+/* Common flag combinations */
+#define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DTO | SDMMC_INT_DCRC | \
+ SDMMC_INT_HTO | SDMMC_INT_SBE | \
+ SDMMC_INT_EBE)
+#define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \
+ SDMMC_INT_RESP_ERR)
+#define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \
+ DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_HLE)
+#define DW_MCI_SEND_STATUS 1
+#define DW_MCI_RECV_STATUS 2
+#define DW_MCI_DMA_THRESHOLD 16
+
+#ifdef CONFIG_MMC_DW_IDMAC
+struct idmac_desc {
+ u32 des0; /* Control Descriptor */
+#define IDMAC_DES0_DIC BIT(1)
+#define IDMAC_DES0_LD BIT(2)
+#define IDMAC_DES0_FD BIT(3)
+#define IDMAC_DES0_CH BIT(4)
+#define IDMAC_DES0_ER BIT(5)
+#define IDMAC_DES0_CES BIT(30)
+#define IDMAC_DES0_OWN BIT(31)
+
+ u32 des1; /* Buffer sizes */
+#define IDMAC_SET_BUFFER1_SIZE(d, s) \
+ ((d)->des1 = ((d)->des1 & 0x03ffc000) | ((s) & 0x3fff))
+
+ u32 des2; /* buffer 1 physical address */
+
+ u32 des3; /* buffer 2 physical address */
+};
+#endif /* CONFIG_MMC_DW_IDMAC */
+
+/**
+ * struct dw_mci_slot - MMC slot state
+ * @mmc: The mmc_host representing this slot.
+ * @host: The MMC controller this slot is using.
+ * @ctype: Card type for this slot.
+ * @mrq: mmc_request currently being processed or waiting to be
+ * processed, or NULL when the slot is idle.
+ * @queue_node: List node for placing this node in the @queue list of
+ * &struct dw_mci.
+ * @clock: Clock rate configured by set_ios(). Protected by host->lock.
+ * @flags: Random state bits associated with the slot.
+ * @id: Number of this slot.
+ * @last_detect_state: Most recently observed card detect state.
+ */
+struct dw_mci_slot {
+ struct mmc_host *mmc;
+ struct dw_mci *host;
+
+ u32 ctype;
+
+ struct mmc_request *mrq;
+ struct list_head queue_node;
+
+ unsigned int clock;
+ unsigned long flags;
+#define DW_MMC_CARD_PRESENT 0
+#define DW_MMC_CARD_NEED_INIT 1
+ int id;
+ int last_detect_state;
+};
+
+#if defined(CONFIG_DEBUG_FS)
+static int dw_mci_req_show(struct seq_file *s, void *v)
+{
+ struct dw_mci_slot *slot = s->private;
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ struct mmc_command *stop;
+ struct mmc_data *data;
+
+ /* Make sure we get a consistent snapshot */
+ spin_lock_bh(&slot->host->lock);
+ mrq = slot->mrq;
+
+ if (mrq) {
+ cmd = mrq->cmd;
+ data = mrq->data;
+ stop = mrq->stop;
+
+ if (cmd)
+ seq_printf(s,
+ "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
+ cmd->opcode, cmd->arg, cmd->flags,
+ cmd->resp[0], cmd->resp[1], cmd->resp[2],
+ cmd->resp[2], cmd->error);
+ if (data)
+ seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
+ data->bytes_xfered, data->blocks,
+ data->blksz, data->flags, data->error);
+ if (stop)
+ seq_printf(s,
+ "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
+ stop->opcode, stop->arg, stop->flags,
+ stop->resp[0], stop->resp[1], stop->resp[2],
+ stop->resp[2], stop->error);
+ }
+
+ spin_unlock_bh(&slot->host->lock);
+
+ return 0;
+}
+
+static int dw_mci_req_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dw_mci_req_show, inode->i_private);
+}
+
+static const struct file_operations dw_mci_req_fops = {
+ .owner = THIS_MODULE,
+ .open = dw_mci_req_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int dw_mci_regs_show(struct seq_file *s, void *v)
+{
+ seq_printf(s, "STATUS:\t0x%08x\n", SDMMC_STATUS);
+ seq_printf(s, "RINTSTS:\t0x%08x\n", SDMMC_RINTSTS);
+ seq_printf(s, "CMD:\t0x%08x\n", SDMMC_CMD);
+ seq_printf(s, "CTRL:\t0x%08x\n", SDMMC_CTRL);
+ seq_printf(s, "INTMASK:\t0x%08x\n", SDMMC_INTMASK);
+ seq_printf(s, "CLKENA:\t0x%08x\n", SDMMC_CLKENA);
+
+ return 0;
+}
+
+static int dw_mci_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dw_mci_regs_show, inode->i_private);
+}
+
+static const struct file_operations dw_mci_regs_fops = {
+ .owner = THIS_MODULE,
+ .open = dw_mci_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void dw_mci_init_debugfs(struct dw_mci_slot *slot)
+{
+ struct mmc_host *mmc = slot->mmc;
+ struct dw_mci *host = slot->host;
+ struct dentry *root;
+ struct dentry *node;
+
+ root = mmc->debugfs_root;
+ if (!root)
+ return;
+
+ node = debugfs_create_file("regs", S_IRUSR, root, host,
+ &dw_mci_regs_fops);
+ if (!node)
+ goto err;
+
+ node = debugfs_create_file("req", S_IRUSR, root, slot,
+ &dw_mci_req_fops);
+ if (!node)
+ goto err;
+
+ node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
+ if (!node)
+ goto err;
+
+ node = debugfs_create_x32("pending_events", S_IRUSR, root,
+ (u32 *)&host->pending_events);
+ if (!node)
+ goto err;
+
+ node = debugfs_create_x32("completed_events", S_IRUSR, root,
+ (u32 *)&host->completed_events);
+ if (!node)
+ goto err;
+
+ return;
+
+err:
+ dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
+}
+#endif /* defined(CONFIG_DEBUG_FS) */
+
+static void dw_mci_set_timeout(struct dw_mci *host)
+{
+ /* timeout (maximum) */
+ mci_writel(host, TMOUT, 0xffffffff);
+}
+
+static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct
mmc_command *cmd)
+{
+ struct mmc_data *data;
+ u32 cmdr;
+ cmd->error = -EINPROGRESS;
+
+ cmdr = cmd->opcode;
+
+ if (cmdr == MMC_STOP_TRANSMISSION)
+ cmdr |= SDMMC_CMD_STOP;
+ else
+ cmdr |= SDMMC_CMD_PRV_DAT_WAIT;
+
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ /* We expect a response, so set this bit */
+ cmdr |= SDMMC_CMD_RESP_EXP;
+ if (cmd->flags & MMC_RSP_136)
+ cmdr |= SDMMC_CMD_RESP_LONG;
+ }
+
+ if (cmd->flags & MMC_RSP_CRC)
+ cmdr |= SDMMC_CMD_RESP_CRC;
+
+ data = cmd->data;
+ if (data) {
+ cmdr |= SDMMC_CMD_DAT_EXP;
+ if (data->flags & MMC_DATA_STREAM)
+ cmdr |= SDMMC_CMD_STRM_MODE;
+ if (data->flags & MMC_DATA_WRITE)
+ cmdr |= SDMMC_CMD_DAT_WR;
+ }
+
+ return cmdr;
+}
+
+static void dw_mci_start_command(struct dw_mci *host,
+ struct mmc_command *cmd, u32 cmd_flags)
+{
+ host->cmd = cmd;
+ dev_vdbg(&host->pdev->dev,
+ "start command: ARGR=0x%08x CMDR=0x%08x\n",
+ cmd->arg, cmd_flags);
+
+ mci_writel(host, CMDARG, cmd->arg);
+ wmb();
+
+ mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START);
+}
+
+static void send_stop_cmd(struct dw_mci *host, struct mmc_data *data)
+{
+ dw_mci_start_command(host, data->stop, host->stop_cmdr);
+}
+
+/* DMA interface functions */
+static void dw_mci_stop_dma(struct dw_mci *host)
+{
+ if (host->use_dma) {
+ host->dma_ops->stop(host);
+ host->dma_ops->cleanup(host);
+ } else {
+ /* Data transfer was stopped by the interrupt handler */
+ set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
+ }
+}
+
+#ifdef CONFIG_MMC_DW_IDMAC
+static void dw_mci_dma_cleanup(struct dw_mci *host)
+{
+ struct mmc_data *data = host->data;
+
+ if (data)
+ dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len,
+ ((data->flags & MMC_DATA_WRITE)
+ ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
+}
+
+static void dw_mci_idmac_stop_dma(struct dw_mci *host)
+{
+ u32 temp;
+
+ /* Disable and reset the IDMAC interface */
+ temp = mci_readl(host, CTRL);
+ temp &= ~SDMMC_CTRL_USE_IDMAC;
+ temp |= SDMMC_CTRL_DMA_RESET;
+ mci_writel(host, CTRL, temp);
+
+ /* Stop the IDMAC running */
+ temp = mci_readl(host, BMOD);
+ temp &= ~SDMMC_IDMAC_ENABLE;
+ mci_writel(host, BMOD, temp);
+}
+
+static void dw_mci_idmac_complete_dma(struct dw_mci *host)
+{
+ struct mmc_data *data = host->data;
+
+ dev_vdbg(&host->pdev->dev, "DMA complete\n");
+
+ host->dma_ops->cleanup(host);
+
+ /*
+ * If the card was removed, data will be NULL. No point in trying to
+ * send the stop command or waiting for NBUSY in this case.
+ */
+ if (data) {
+ set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
+ tasklet_schedule(&host->tasklet);
+ }
+}
+
+static void dw_mci_translate_sglist(struct dw_mci *host, struct mmc_data *data,
+ unsigned int sg_len)
+{
+ int i;
+ struct idmac_desc *desc = host->sg_cpu;
+
+ for (i = 0; i < sg_len; i++, desc++) {
+ unsigned int length = sg_dma_len(&data->sg[i]);
+ u32 mem_addr = sg_dma_address(&data->sg[i]);
+
+ /* Set the OWN bit and disable interrupts for this descriptor */
+ desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | IDMAC_DES0_CH;
+
+ /* Buffer length */
+ IDMAC_SET_BUFFER1_SIZE(desc, length);
+
+ /* Physical address to DMA to/from */
+ desc->des2 = mem_addr;
+ }
+
+ /* Set first descriptor */
+ desc = host->sg_cpu;
+ desc->des0 |= IDMAC_DES0_FD;
+
+ /* Set last descriptor */
+ desc = host->sg_cpu + (i - 1) * sizeof(struct idmac_desc);
+ desc->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC);
+ desc->des0 |= IDMAC_DES0_LD;
+
+ wmb();
+}
+
+static void dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len)
+{
+ u32 temp;
+
+ dw_mci_translate_sglist(host, host->data, sg_len);
+
+ /* Select IDMAC interface */
+ temp = mci_readl(host, CTRL);
+ temp |= SDMMC_CTRL_USE_IDMAC;
+ mci_writel(host, CTRL, temp);
+
+ wmb();
+
+ /* Enable the IDMAC */
+ temp = mci_readl(host, BMOD);
+ temp |= SDMMC_IDMAC_ENABLE;
+ mci_writel(host, BMOD, temp);
+
+ /* Start it running */
+ mci_writel(host, PLDMND, 1);
+}
+
+static int dw_mci_idmac_init(struct dw_mci *host)
+{
+ struct idmac_desc *p;
+ int i;
+
+ /* Number of descriptors in the ring buffer */
+ host->ring_size = PAGE_SIZE / sizeof(struct idmac_desc);
+
+ /* Forward link the descriptor list */
+ for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; i++, p++)
+ p->des3 = host->sg_dma + (sizeof(struct idmac_desc) * (i + 1));
+
+ /* Set the last descriptor as the end-of-ring descriptor */
+ p->des3 = host->sg_dma;
+ p->des0 = IDMAC_DES0_ER;
+
+ /* Mask out interrupts - get Tx & Rx complete only */
+ mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | SDMMC_IDMAC_INT_RI |
+ SDMMC_IDMAC_INT_TI);
+
+ /* Set the descriptor base address */
+ mci_writel(host, DBADDR, host->sg_dma);
+ return 0;
+}
+
+static struct dw_mci_dma_ops dw_mci_idmac_ops = {
+ .init = dw_mci_idmac_init,
+ .start = dw_mci_idmac_start_dma,
+ .stop = dw_mci_idmac_stop_dma,
+ .complete = dw_mci_idmac_complete_dma,
+ .cleanup = dw_mci_dma_cleanup,
+};
+#endif /* CONFIG_MMC_DW_IDMAC */
+
+static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
+{
+ struct scatterlist *sg;
+ unsigned int i, direction, sg_len;
+ u32 temp;
+
+ /* If we don't have a channel, we can't do DMA */
+ if (!host->use_dma)
+ return -ENODEV;
+
+ /*
+ * We don't do DMA on "complex" transfers, i.e. with
+ * non-word-aligned buffers or lengths. Also, we don't bother
+ * with all the DMA setup overhead for short transfers.
+ */
+ if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD)
+ return -EINVAL;
+ if (data->blksz & 3)
+ return -EINVAL;
+
+ for_each_sg(data->sg, sg, data->sg_len, i) {
+ if (sg->offset & 3 || sg->length & 3)
+ return -EINVAL;
+ }
+
+ if (data->flags & MMC_DATA_READ)
+ direction = DMA_FROM_DEVICE;
+ else
+ direction = DMA_TO_DEVICE;
+
+ sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len,
+ direction);
+
+ dev_vdbg(&host->pdev->dev,
+ "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n",
+ (unsigned long)host->sg_cpu, (unsigned long)host->sg_dma,
+ sg_len);
+
+ /* Enable the DMA interface */
+ temp = mci_readl(host, CTRL);
+ temp |= SDMMC_CTRL_DMA_ENABLE;
+ mci_writel(host, CTRL, temp);
+
+ /* Disable RX/TX IRQs, let DMA handle it */
+ temp = mci_readl(host, INTMASK);
+ temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR);
+ mci_writel(host, INTMASK, temp);
+
+ host->dma_ops->start(host, sg_len);
+
+ return 0;
+}
+
+static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data)
+{
+ u32 temp;
+
+ data->error = -EINPROGRESS;
+
+ WARN_ON(host->data);
+ host->sg = NULL;
+ host->data = data;
+
+ if (dw_mci_submit_data_dma(host, data)) {
+ host->sg = data->sg;
+ host->pio_offset = 0;
+ if (data->flags & MMC_DATA_READ)
+ host->dir_status = DW_MCI_RECV_STATUS;
+ else
+ host->dir_status = DW_MCI_SEND_STATUS;
+
+ temp = mci_readl(host, INTMASK);
+ temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR;
+ mci_writel(host, INTMASK, temp);
+
+ temp = mci_readl(host, CTRL);
+ temp &= ~SDMMC_CTRL_DMA_ENABLE;
+ mci_writel(host, CTRL, temp);
+ }
+}
+
+static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
+{
+ struct dw_mci *host = slot->host;
+ unsigned long timeout = jiffies + msecs_to_jiffies(500);
+ unsigned int cmd_status = 0;
+
+ mci_writel(host, CMDARG, arg);
+ wmb();
+ mci_writel(host, CMD, SDMMC_CMD_START | cmd);
+
+ while (time_before(jiffies, timeout)) {
+ cmd_status = mci_readl(host, CMD);
+ if (!(cmd_status & SDMMC_CMD_START))
+ return;
+ }
+ dev_err(&slot->mmc->class_dev,
+ "Timeout sending command (cmd %#x arg %#x status %#x)\n",
+ cmd, arg, cmd_status);
+}
+
+static void dw_mci_setup_bus(struct dw_mci_slot *slot)
+{
+ struct dw_mci *host = slot->host;
+ u32 div;
+
+ if (slot->clock != host->current_speed) {
+ if (host->bus_hz % slot->clock)
+ /*
+ * move the + 1 after the divide to prevent
+ * over-clocking the card.
+ */
+ div = ((host->bus_hz / slot->clock) >> 1) + 1;
+ else
+ div = (host->bus_hz / slot->clock) >> 1;
+
+ dev_info(&slot->mmc->class_dev,
+ "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ"
+ " div = %d)\n", slot->id, host->bus_hz, slot->clock,
+ div ? ((host->bus_hz / div) >> 1) : host->bus_hz, div);
+
+ /* disable clock */
+ mci_writel(host, CLKENA, 0);
+ mci_writel(host, CLKSRC, 0);
+
+ /* inform CIU */
+ mci_send_cmd(slot,
+ SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+
+ /* set clock to desired speed */
+ mci_writel(host, CLKDIV, div);
+
+ /* inform CIU */
+ mci_send_cmd(slot,
+ SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+
+ /* enable clock */
+ mci_writel(host, CLKENA, SDMMC_CLKEN_ENABLE);
+
+ /* inform CIU */
+ mci_send_cmd(slot,
+ SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
+
+ host->current_speed = slot->clock;
+ }
+
+ /* Set the current slot bus width */
+ mci_writel(host, CTYPE, slot->ctype);
+}
+
+static void dw_mci_start_request(struct dw_mci *host,
+ struct dw_mci_slot *slot)
+{
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+ u32 cmdflags;
+
+ mrq = slot->mrq;
+ if (host->pdata->select_slot)
+ host->pdata->select_slot(slot->id);
+
+ /* Slot specific timing and width adjustment */
+ dw_mci_setup_bus(slot);
+
+ host->cur_slot = slot;
+ host->mrq = mrq;
+
+ host->pending_events = 0;
+ host->completed_events = 0;
+ host->data_status = 0;
+
+ data = mrq->data;
+ if (data) {
+ dw_mci_set_timeout(host);
+ mci_writel(host, BYTCNT, data->blksz*data->blocks);
+ mci_writel(host, BLKSIZ, data->blksz);
+ }
+
+ cmd = mrq->cmd;
+ cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
+
+ /* this is the first command, send the initialization clock */
+ if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags))
+ cmdflags |= SDMMC_CMD_INIT;
+
+ if (data) {
+ dw_mci_submit_data(host, data);
+ wmb();
+ }
+
+ dw_mci_start_command(host, cmd, cmdflags);
+
+ if (mrq->stop)
+ host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
+}
+
+static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
+ struct mmc_request *mrq)
+{
+ dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
+ host->state);
+
+ spin_lock_bh(&host->lock);
+ slot->mrq = mrq;
+
+ if (host->state == STATE_IDLE) {
+ host->state = STATE_SENDING_CMD;
+ dw_mci_start_request(host, slot);
+ } else {
+ list_add_tail(&slot->queue_node, &host->queue);
+ }
+
+ spin_unlock_bh(&host->lock);
+}
+
+static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+ struct dw_mci *host = slot->host;
+
+ WARN_ON(slot->mrq);
+
+ if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) {
+ mrq->cmd->error = -ENOMEDIUM;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ /* We don't support multiple blocks of weird lengths. */
+ dw_mci_queue_request(host, slot, mrq);
+}
+
+static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+
+ /* set default 1 bit mode */
+ slot->ctype = SDMMC_CTYPE_1BIT;
+
+ switch (ios->bus_width) {
+ case MMC_BUS_WIDTH_1:
+ slot->ctype = SDMMC_CTYPE_1BIT;
+ break;
+ case MMC_BUS_WIDTH_4:
+ slot->ctype = SDMMC_CTYPE_4BIT;
+ break;
+ }
+
+ if (ios->clock) {
+ /*
+ * Use mirror of ios->clock to prevent race with mmc
+ * core ios update when finding the minimum.
+ */
+ slot->clock = ios->clock;
+ }
+
+ switch (ios->power_mode) {
+ case MMC_POWER_UP:
+ set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
+ break;
+ default:
+ break;
+ }
+}
+
+static int dw_mci_get_ro(struct mmc_host *mmc)
+{
+ int read_only;
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+ struct dw_mci_board *brd = slot->host->pdata;
+
+ /* Use platform get_ro function, else try on board write protect */
+ if (brd->get_ro)
+ read_only = brd->get_ro(slot->id);
+ else
+ read_only =
+ mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0;
+
+ dev_dbg(&mmc->class_dev, "card is %s\n",
+ read_only ? "read-only" : "read-write");
+
+ return read_only;
+}
+
+static int dw_mci_get_cd(struct mmc_host *mmc)
+{
+ int present;
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+ struct dw_mci_board *brd = slot->host->pdata;
+
+ /* Use platform get_cd function, else try onboard card detect */
+ if (brd->get_cd)
+ present = !brd->get_cd(slot->id);
+ else
+ present = (mci_readl(slot->host, CDETECT) & (1 << slot->id))
+ == 0 ? 1 : 0;
+
+ if (present)
+ dev_dbg(&mmc->class_dev, "card is present\n");
+ else
+ dev_dbg(&mmc->class_dev, "card is not present\n");
+
+ return present;
+}
+
+static const struct mmc_host_ops dw_mci_ops = {
+ .request = dw_mci_request,
+ .set_ios = dw_mci_set_ios,
+ .get_ro = dw_mci_get_ro,
+ .get_cd = dw_mci_get_cd,
+};
+
+static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
+ __releases(&host->lock)
+ __acquires(&host->lock)
+{
+ struct dw_mci_slot *slot;
+ struct mmc_host *prev_mmc = host->cur_slot->mmc;
+
+ WARN_ON(host->cmd || host->data);
+
+ host->cur_slot->mrq = NULL;
+ host->mrq = NULL;
+ if (!list_empty(&host->queue)) {
+ slot = list_entry(host->queue.next,
+ struct dw_mci_slot, queue_node);
+ list_del(&slot->queue_node);
+ dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
+ mmc_hostname(slot->mmc));
+ host->state = STATE_SENDING_CMD;
+ dw_mci_start_request(host, slot);
+ } else {
+ dev_vdbg(&host->pdev->dev, "list empty\n");
+ host->state = STATE_IDLE;
+ }
+
+ spin_unlock(&host->lock);
+ mmc_request_done(prev_mmc, mrq);
+ spin_lock(&host->lock);
+}
+
+static void dw_mci_command_complete(struct dw_mci *host, struct
mmc_command *cmd)
+{
+ u32 status = host->cmd_status;
+
+ host->cmd_status = 0;
+
+ /* Read the response from the card (up to 16 bytes) */
+ if (cmd->flags & MMC_RSP_PRESENT) {
+ if (cmd->flags & MMC_RSP_136) {
+ cmd->resp[3] = mci_readl(host, RESP0);
+ cmd->resp[2] = mci_readl(host, RESP1);
+ cmd->resp[1] = mci_readl(host, RESP2);
+ cmd->resp[0] = mci_readl(host, RESP3);
+ } else {
+ cmd->resp[0] = mci_readl(host, RESP0);
+ cmd->resp[1] = 0;
+ cmd->resp[2] = 0;
+ cmd->resp[3] = 0;
+ }
+ }
+
+ if (status & SDMMC_INT_RTO)
+ cmd->error = -ETIMEDOUT;
+ else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC))
+ cmd->error = -EILSEQ;
+ else if (status & SDMMC_INT_RESP_ERR)
+ cmd->error = -EIO;
+ else
+ cmd->error = 0;
+
+ if (cmd->error) {
+ /* newer ip versions need a delay between retries */
+ if (host->quirks & DW_MCI_QUIRK_RETRY_DELAY)
+ mdelay(20);
+
+ if (cmd->data) {
+ host->data = NULL;
+ dw_mci_stop_dma(host);
+ }
+ }
+}
+
+static void dw_mci_tasklet_func(unsigned long priv)
+{
+ struct dw_mci *host = (struct dw_mci *)priv;
+ struct mmc_data *data;
+ struct mmc_command *cmd;
+ enum dw_mci_state state;
+ enum dw_mci_state prev_state;
+ u32 status;
+
+ spin_lock(&host->lock);
+
+ state = host->state;
+ data = host->data;
+
+ do {
+ prev_state = state;
+
+ switch (state) {
+ case STATE_IDLE:
+ break;
+
+ case STATE_SENDING_CMD:
+ if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
+ &host->pending_events))
+ break;
+
+ cmd = host->cmd;
+ host->cmd = NULL;
+ set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
+ dw_mci_command_complete(host, host->mrq->cmd);
+ if (!host->mrq->data || cmd->error) {
+ dw_mci_request_end(host, host->mrq);
+ goto unlock;
+ }
+
+ prev_state = state = STATE_SENDING_DATA;
+ /* fall through */
+
+ case STATE_SENDING_DATA:
+ if (test_and_clear_bit(EVENT_DATA_ERROR,
+ &host->pending_events)) {
+ dw_mci_stop_dma(host);
+ if (data->stop)
+ send_stop_cmd(host, data);
+ state = STATE_DATA_ERROR;
+ break;
+ }
+
+ if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
+ &host->pending_events))
+ break;
+
+ set_bit(EVENT_XFER_COMPLETE, &host->completed_events);
+ prev_state = state = STATE_DATA_BUSY;
+ /* fall through */
+
+ case STATE_DATA_BUSY:
+ if (!test_and_clear_bit(EVENT_DATA_COMPLETE,
+ &host->pending_events))
+ break;
+
+ host->data = NULL;
+ set_bit(EVENT_DATA_COMPLETE, &host->completed_events);
+ status = host->data_status;
+
+ if (status & DW_MCI_DATA_ERROR_FLAGS) {
+ if (status & SDMMC_INT_DTO) {
+ dev_err(&host->pdev->dev,
+ "data timeout error\n");
+ data->error = -ETIMEDOUT;
+ } else if (status & SDMMC_INT_DCRC) {
+ dev_err(&host->pdev->dev,
+ "data CRC error\n");
+ data->error = -EILSEQ;
+ } else {
+ dev_err(&host->pdev->dev,
+ "data FIFO error "
+ "(status=%08x)\n",
+ status);
+ data->error = -EIO;
+ }
+ } else {
+ data->bytes_xfered = data->blocks * data->blksz;
+ data->error = 0;
+ }
+
+ if (!data->stop) {
+ dw_mci_request_end(host, host->mrq);
+ goto unlock;
+ }
+
+ prev_state = state = STATE_SENDING_STOP;
+ if (!data->error)
+ send_stop_cmd(host, data);
+ /* fall through */
+
+ case STATE_SENDING_STOP:
+ if (!test_and_clear_bit(EVENT_CMD_COMPLETE,
+ &host->pending_events))
+ break;
+
+ host->cmd = NULL;
+ dw_mci_command_complete(host, host->mrq->stop);
+ dw_mci_request_end(host, host->mrq);
+ goto unlock;
+
+ case STATE_DATA_ERROR:
+ if (!test_and_clear_bit(EVENT_XFER_COMPLETE,
+ &host->pending_events))
+ break;
+
+ state = STATE_DATA_BUSY;
+ break;
+ }
+ } while (state != prev_state);
+
+ host->state = state;
+unlock:
+ spin_unlock(&host->lock);
+
+}
+
+static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt)
+{
+ u16 *pdata = (u16 *)buf;
+
+ WARN_ON(cnt % 2 != 0);
+
+ cnt = cnt >> 1;
+ while (cnt > 0) {
+ mci_writew(host, DATA, *pdata++);
+ cnt--;
+ }
+}
+
+static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt)
+{
+ u16 *pdata = (u16 *)buf;
+
+ WARN_ON(cnt % 2 != 0);
+
+ cnt = cnt >> 1;
+ while (cnt > 0) {
+ *pdata++ = mci_readw(host, DATA);
+ cnt--;
+ }
+}
+
+static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt)
+{
+ u32 *pdata = (u32 *)buf;
+
+ WARN_ON(cnt % 4 != 0);
+ WARN_ON((unsigned long)pdata & 0x3);
+
+ cnt = cnt >> 2;
+ while (cnt > 0) {
+ mci_writel(host, DATA, *pdata++);
+ cnt--;
+ }
+}
+
+static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt)
+{
+ u32 *pdata = (u32 *)buf;
+
+ WARN_ON(cnt % 4 != 0);
+ WARN_ON((unsigned long)pdata & 0x3);
+
+ cnt = cnt >> 2;
+ while (cnt > 0) {
+ *pdata++ = mci_readl(host, DATA);
+ cnt--;
+ }
+}
+
+static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt)
+{
+ u64 *pdata = (u64 *)buf;
+
+ WARN_ON(cnt % 8 != 0);
+
+ cnt = cnt >> 3;
+ while (cnt > 0) {
+ mci_writeq(host, DATA, *pdata++);
+ cnt--;
+ }
+}
+
+static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt)
+{
+ u64 *pdata = (u64 *)buf;
+
+ WARN_ON(cnt % 8 != 0);
+
+ cnt = cnt >> 3;
+ while (cnt > 0) {
+ *pdata++ = mci_readq(host, DATA);
+ cnt--;
+ }
+}
+
+static void dw_mci_read_data_pio(struct dw_mci *host)
+{
+ struct scatterlist *sg = host->sg;
+ void *buf = sg_virt(sg);
+ unsigned int offset = host->pio_offset;
+ struct mmc_data *data = host->data;
+ int shift = host->data_shift;
+ u32 status;
+ unsigned int nbytes = 0, len, old_len, count = 0;
+
+ do {
+ len = SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift;
+ if (count == 0)
+ old_len = len;
+
+ if (offset + len <= sg->length) {
+ host->pull_data(host, (void *)(buf + offset), len);
+
+ offset += len;
+ nbytes += len;
+
+ if (offset == sg->length) {
+ flush_dcache_page(sg_page(sg));
+ host->sg = sg = sg_next(sg);
+ if (!sg)
+ goto done;
+
+ offset = 0;
+ buf = sg_virt(sg);
+ }
+ } else {
+ unsigned int remaining = sg->length - offset;
+ host->pull_data(host, (void *)(buf + offset),
+ remaining);
+ nbytes += remaining;
+
+ flush_dcache_page(sg_page(sg));
+ host->sg = sg = sg_next(sg);
+ if (!sg)
+ goto done;
+
+ offset = len - remaining;
+ buf = sg_virt(sg);
+ host->pull_data(host, buf, offset);
+ nbytes += offset;
+ }
+
+ status = mci_readl(host, MINTSTS);
+ mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
+ if (status & DW_MCI_DATA_ERROR_FLAGS) {
+ host->data_status = status;
+ data->bytes_xfered += nbytes;
+ smp_wmb();
+
+ set_bit(EVENT_DATA_ERROR, &host->pending_events);
+
+ tasklet_schedule(&host->tasklet);
+ return;
+ }
+ count++;
+ } while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
+ len = SDMMC_GET_FCNT(mci_readl(host, STATUS));
+ host->pio_offset = offset;
+ data->bytes_xfered += nbytes;
+ return;
+
+done:
+ data->bytes_xfered += nbytes;
+ smp_wmb();
+ set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
+}
+
+static void dw_mci_write_data_pio(struct dw_mci *host)
+{
+ struct scatterlist *sg = host->sg;
+ void *buf = sg_virt(sg);
+ unsigned int offset = host->pio_offset;
+ struct mmc_data *data = host->data;
+ int shift = host->data_shift;
+ u32 status;
+ unsigned int nbytes = 0, len;
+
+ do {
+ len = SDMMC_FIFO_SZ -
+ (SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
+ if (offset + len <= sg->length) {
+ host->push_data(host, (void *)(buf + offset), len);
+
+ offset += len;
+ nbytes += len;
+ if (offset == sg->length) {
+ host->sg = sg = sg_next(sg);
+ if (!sg)
+ goto done;
+
+ offset = 0;
+ buf = sg_virt(sg);
+ }
+ } else {
+ unsigned int remaining = sg->length - offset;
+
+ host->push_data(host, (void *)(buf + offset),
+ remaining);
+ nbytes += remaining;
+
+ host->sg = sg = sg_next(sg);
+ if (!sg)
+ goto done;
+
+ offset = len - remaining;
+ buf = sg_virt(sg);
+ host->push_data(host, (void *)buf, offset);
+ nbytes += offset;
+ }
+
+ status = mci_readl(host, MINTSTS);
+ mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
+ if (status & DW_MCI_DATA_ERROR_FLAGS) {
+ host->data_status = status;
+ data->bytes_xfered += nbytes;
+
+ smp_wmb();
+
+ set_bit(EVENT_DATA_ERROR, &host->pending_events);
+
+ tasklet_schedule(&host->tasklet);
+ return;
+ }
+ } while (status & SDMMC_INT_TXDR); /* if TXDR write again */
+
+ host->pio_offset = offset;
+ data->bytes_xfered += nbytes;
+
+ return;
+
+done:
+ data->bytes_xfered += nbytes;
+ smp_wmb();
+ set_bit(EVENT_XFER_COMPLETE, &host->pending_events);
+}
+
+static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status)
+{
+ if (!host->cmd_status)
+ host->cmd_status = status;
+
+ smp_wmb();
+
+ set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
+ tasklet_schedule(&host->tasklet);
+}
+
+static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
+{
+ struct dw_mci *host = dev_id;
+ u32 status, pending;
+ unsigned int pass_count = 0;
+
+ do {
+ status = mci_readl(host, RINTSTS);
+ pending = mci_readl(host, MINTSTS); /* read-only mask reg */
+
+ /*
+ * DTO fix - version 2.10a and below, and only if internal DMA
+ * is configured.
+ */
+ if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO) {
+ if (!pending &&
+ ((mci_readl(host, STATUS) >> 17) & 0x1fff))
+ pending |= SDMMC_INT_DATA_OVER;
+ }
+
+ if (!pending)
+ break;
+
+ if (pending & DW_MCI_CMD_ERROR_FLAGS) {
+ mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
+ host->cmd_status = status;
+ smp_wmb();
+ set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
+ tasklet_schedule(&host->tasklet);
+ }
+
+ if (pending & DW_MCI_DATA_ERROR_FLAGS) {
+ /* if there is an error report DATA_ERROR */
+ mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
+ host->data_status = status;
+ smp_wmb();
+ set_bit(EVENT_DATA_ERROR, &host->pending_events);
+ tasklet_schedule(&host->tasklet);
+ }
+
+ if (pending & SDMMC_INT_DATA_OVER) {
+ mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER);
+ if (!host->data_status)
+ host->data_status = status;
+ smp_wmb();
+ if (host->dir_status == DW_MCI_RECV_STATUS) {
+ if (host->sg != NULL)
+ dw_mci_read_data_pio(host);
+ }
+ set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+ tasklet_schedule(&host->tasklet);
+ }
+
+ if (pending & SDMMC_INT_RXDR) {
+ mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
+ if (host->sg)
+ dw_mci_read_data_pio(host);
+ }
+
+ if (pending & SDMMC_INT_TXDR) {
+ mci_writel(host, RINTSTS, SDMMC_INT_TXDR);
+ if (host->sg)
+ dw_mci_write_data_pio(host);
+ }
+
+ if (pending & SDMMC_INT_CMD_DONE) {
+ mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE);
+ dw_mci_cmd_interrupt(host, status);
+ }
+
+ if (pending & SDMMC_INT_CD) {
+ mci_writel(host, RINTSTS, SDMMC_INT_CD);
+ tasklet_schedule(&host->card_tasklet);
+ }
+
+ } while (pass_count++ < 5);
+
+#ifdef CONFIG_MMC_DW_IDMAC
+ /* Handle DMA interrupts */
+ pending = mci_readl(host, IDSTS);
+ if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) {
+ mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI);
+ mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI);
+ set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
+ host->dma_ops->complete(host);
+ }
+#endif
+
+ return IRQ_HANDLED;
+}
+
+static void dw_mci_tasklet_card(unsigned long data)
+{
+ struct dw_mci *host = (struct dw_mci *)data;
+ int i;
+
+ for (i = 0; i < host->num_slots; i++) {
+ struct dw_mci_slot *slot = host->slot[i];
+ struct mmc_host *mmc = slot->mmc;
+ struct mmc_request *mrq;
+ int present;
+ u32 ctrl;
+
+ present = dw_mci_get_cd(mmc);
+ while (present != slot->last_detect_state) {
+ spin_lock(&host->lock);
+
+ dev_dbg(&slot->mmc->class_dev, "card %s\n",
+ present ? "inserted" : "removed");
+
+ /* Card change detected */
+ slot->last_detect_state = present;
+
+ /* Power up slot */
+ if (present != 0) {
+ if (host->pdata->setpower)
+ host->pdata->setpower(slot->id,
+ mmc->ocr_avail);
+
+ set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+ }
+
+ /* Clean up queue if present */
+ mrq = slot->mrq;
+ if (mrq) {
+ if (mrq == host->mrq) {
+ host->data = NULL;
+ host->cmd = NULL;
+
+ switch (host->state) {
+ case STATE_IDLE:
+ break;
+ case STATE_SENDING_CMD:
+ mrq->cmd->error = -ENOMEDIUM;
+ if (!mrq->data)
+ break;
+ /* fall through */
+ case STATE_SENDING_DATA:
+ mrq->data->error = -ENOMEDIUM;
+ dw_mci_stop_dma(host);
+ break;
+ case STATE_DATA_BUSY:
+ case STATE_DATA_ERROR:
+ if (mrq->data->error == -EINPROGRESS)
+ mrq->data->error = -ENOMEDIUM;
+ if (!mrq->stop)
+ break;
+ /* fall through */
+ case STATE_SENDING_STOP:
+ mrq->stop->error = -ENOMEDIUM;
+ break;
+ }
+
+ dw_mci_request_end(host, mrq);
+ } else {
+ list_del(&slot->queue_node);
+ mrq->cmd->error = -ENOMEDIUM;
+ if (mrq->data)
+ mrq->data->error = -ENOMEDIUM;
+ if (mrq->stop)
+ mrq->stop->error = -ENOMEDIUM;
+
+ spin_unlock(&host->lock);
+ mmc_request_done(slot->mmc, mrq);
+ spin_lock(&host->lock);
+ }
+ }
+
+ /* Power down slot */
+ if (present == 0) {
+ if (host->pdata->setpower)
+ host->pdata->setpower(slot->id, 0);
+ clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+
+ /*
+ * Clear down the FIFO - doing so generates a
+ * block interrupt, hence setting the
+ * scatter-gather pointer to NULL.
+ */
+ host->sg = NULL;
+
+ ctrl = mci_readl(host, CTRL);
+ ctrl |= SDMMC_CTRL_FIFO_RESET;
+ mci_writel(host, CTRL, ctrl);
+
+#ifdef CONFIG_MMC_DW_IDMAC
+ ctrl = mci_readl(host, BMOD);
+ ctrl |= 0x01; /* Software reset of DMA */
+ mci_writel(host, BMOD, ctrl);
+#endif
+
+ }
+
+ spin_unlock(&host->lock);
+ present = dw_mci_get_cd(mmc);
+ }
+
+ mmc_detect_change(slot->mmc,
+ msecs_to_jiffies(host->pdata->detect_delay_ms));
+ }
+}
+
+static int __init dw_mci_init_slot(struct dw_mci *host, unsigned int id)
+{
+ struct mmc_host *mmc;
+ struct dw_mci_slot *slot;
+
+ mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), &host->pdev->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ slot = mmc_priv(mmc);
+ slot->id = id;
+ slot->mmc = mmc;
+ slot->host = host;
+
+ mmc->ops = &dw_mci_ops;
+ mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
+ mmc->f_max = host->bus_hz;
+
+ if (host->pdata->get_ocr)
+ mmc->ocr_avail = host->pdata->get_ocr(id);
+ else
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+
+ /*
+ * Start with slot power disabled, it will be enabled when a card
+ * is detected.
+ */
+ if (host->pdata->setpower)
+ host->pdata->setpower(id, 0);
+
+ mmc->caps = 0;
+ if (host->pdata->get_bus_wd)
+ if (host->pdata->get_bus_wd(slot->id) >= 4)
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
+
+ if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
+ mmc->caps |= MMC_CAP_SD_HIGHSPEED;
+
+#ifdef CONFIG_MMC_DW_IDMAC
+ mmc->max_segs = host->ring_size;
+ mmc->max_blk_size = 65536;
+ mmc->max_blk_count = host->ring_size;
+ mmc->max_seg_size = 0x1000;
+ mmc->max_req_size = mmc->max_seg_size * mmc->max_blk_count;
+#else
+ if (host->pdata->blk_settings) {
+ mmc->max_segs = host->pdata->blk_settings->max_segs;
+ mmc->max_blk_size = host->pdata->blk_settings->max_blk_size;
+ mmc->max_blk_count = host->pdata->blk_settings->max_blk_count;
+ mmc->max_req_size = host->pdata->blk_settings->max_req_size;
+ mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
+ } else {
+ /* Useful defaults if platform data is unset. */
+ mmc->max_segs = 64;
+ mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
+ mmc->max_blk_count = 512;
+ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
+ mmc->max_seg_size = mmc->max_req_size;
+ }
+#endif /* CONFIG_MMC_DW_IDMAC */
+
+ if (dw_mci_get_cd(mmc))
+ set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+ else
+ clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
+
+ host->slot[id] = slot;
+ mmc_add_host(mmc);
+
+#if defined(CONFIG_DEBUG_FS)
+ dw_mci_init_debugfs(slot);
+#endif
+
+ /* Card initially undetected */
+ slot->last_detect_state = 0;
+
+ return 0;
+}
+
+static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
+{
+ /* Shutdown detect IRQ */
+ if (slot->host->pdata->exit)
+ slot->host->pdata->exit(id);
+
+ /* Debugfs stuff is cleaned up by mmc core */
+ mmc_remove_host(slot->mmc);
+ slot->host->slot[id] = NULL;
+ mmc_free_host(slot->mmc);
+}
+
+static void dw_mci_init_dma(struct dw_mci *host)
+{
+ /* Alloc memory for sg translation */
+ host->sg_cpu = dma_alloc_coherent(&host->pdev->dev, PAGE_SIZE,
+ &host->sg_dma, GFP_KERNEL);
+ if (!host->sg_cpu) {
+ dev_err(&host->pdev->dev, "%s: could not alloc DMA memory\n",
+ __func__);
+ goto no_dma;
+ }
+
+ /* Determine which DMA interface to use */
+#ifdef CONFIG_MMC_DW_IDMAC
+ host->dma_ops = &dw_mci_idmac_ops;
+ dev_info(&host->pdev->dev, "Using internal DMA controller.\n");
+#endif
+
+ if (!host->dma_ops)
+ goto no_dma;
+
+ if (host->dma_ops->init) {
+ if (host->dma_ops->init(host)) {
+ dev_err(&host->pdev->dev, "%s: Unable to initialize "
+ "DMA Controller.\n", __func__);
+ goto no_dma;
+ }
+ } else {
+ dev_err(&host->pdev->dev, "DMA initialization not found.\n");
+ goto no_dma;
+ }
+
+ host->use_dma = 1;
+ return;
+
+no_dma:
+ dev_info(&host->pdev->dev, "Using PIO mode.\n");
+ host->use_dma = 0;
+ return;
+}
+
+static bool mci_wait_reset(struct device *dev, struct dw_mci *host)
+{
+ unsigned long timeout = jiffies + msecs_to_jiffies(500);
+ unsigned int ctrl;
+
+ mci_writel(host, CTRL, (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
+ SDMMC_CTRL_DMA_RESET));
+
+ /* wait till resets clear */
+ do {
+ ctrl = mci_readl(host, CTRL);
+ if (!(ctrl & (SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET |
+ SDMMC_CTRL_DMA_RESET)))
+ return true;
+ } while (time_before(jiffies, timeout));
+
+ dev_err(dev, "Timeout resetting block (ctrl %#x)\n", ctrl);
+
+ return false;
+}
+
+static int dw_mci_probe(struct platform_device *pdev)
+{
+ struct dw_mci *host;
+ struct resource *regs;
+ struct dw_mci_board *pdata;
+ int irq, ret, i, width;
+ u32 fifo_size;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ return -ENXIO;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ host = kzalloc(sizeof(struct dw_mci), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ host->pdev = pdev;
+ host->pdata = pdata = pdev->dev.platform_data;
+ if (!pdata || !pdata->init) {
+ dev_err(&pdev->dev,
+ "Platform data must supply init function\n");
+ ret = -ENODEV;
+ goto err_freehost;
+ }
+
+ if (!pdata->select_slot && pdata->num_slots > 1) {
+ dev_err(&pdev->dev,
+ "Platform data must supply select_slot function\n");
+ ret = -ENODEV;
+ goto err_freehost;
+ }
+
+ if (!pdata->bus_hz) {
+ dev_err(&pdev->dev,
+ "Platform data must supply bus speed\n");
+ ret = -ENODEV;
+ goto err_freehost;
+ }
+
+ host->bus_hz = pdata->bus_hz;
+ host->quirks = pdata->quirks;
+
+ spin_lock_init(&host->lock);
+ INIT_LIST_HEAD(&host->queue);
+
+ ret = -ENOMEM;
+ host->regs = ioremap(regs->start, regs->end - regs->start + 1);
+ if (!host->regs)
+ goto err_freehost;
+
+ host->dma_ops = pdata->dma_ops;
+ dw_mci_init_dma(host);
+
+ /*
+ * Get the host data width - this assumes that HCON has been set with
+ * the correct values.
+ */
+ i = (mci_readl(host, HCON) >> 7) & 0x7;
+ if (!i) {
+ host->push_data = dw_mci_push_data16;
+ host->pull_data = dw_mci_pull_data16;
+ width = 16;
+ host->data_shift = 1;
+ } else if (i == 2) {
+ host->push_data = dw_mci_push_data64;
+ host->pull_data = dw_mci_pull_data64;
+ width = 64;
+ host->data_shift = 3;
+ } else {
+ /* Check for a reserved value, and warn if it is */
+ WARN((i != 1),
+ "HCON reports a reserved host data width!\n"
+ "Defaulting to 32-bit access.\n");
+ host->push_data = dw_mci_push_data32;
+ host->pull_data = dw_mci_pull_data32;
+ width = 32;
+ host->data_shift = 2;
+ }
+
+ /* Reset all blocks */
+ if (!mci_wait_reset(&pdev->dev, host)) {
+ ret = -ENODEV;
+ goto err_dmaunmap;
+ }
+
+ /* Clear the interrupts for the host controller */
+ mci_writel(host, RINTSTS, 0xFFFFFFFF);
+ mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
+
+ /* Put in max timeout */
+ mci_writel(host, TMOUT, 0xFFFFFFFF);
+
+ /*
+ * FIFO threshold settings RxMark = fifo_size / 2 - 1,
+ * Tx Mark = fifo_size / 2 DMA Size = 8
+ */
+ fifo_size = mci_readl(host, FIFOTH);
+ fifo_size = (fifo_size >> 16) & 0x7ff;
+ mci_writel(host, FIFOTH, ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
+ ((fifo_size/2) << 0)));
+
+ /* disable clock to CIU */
+ mci_writel(host, CLKENA, 0);
+ mci_writel(host, CLKSRC, 0);
+
+ tasklet_init(&host->tasklet, dw_mci_tasklet_func, (unsigned long)host);
+ tasklet_init(&host->card_tasklet,
+ dw_mci_tasklet_card, (unsigned long)host);
+
+ ret = request_irq(irq, dw_mci_interrupt, 0, "dw-mci", host);
+ if (ret)
+ goto err_dmaunmap;
+
+ platform_set_drvdata(pdev, host);
+
+ if (host->pdata->num_slots)
+ host->num_slots = host->pdata->num_slots;
+ else
+ host->num_slots = ((mci_readl(host, HCON) >> 1) & 0x1F) + 1;
+
+ /* We need at least one slot to succeed */
+ for (i = 0; i < host->num_slots; i++) {
+ ret = dw_mci_init_slot(host, i);
+ if (ret) {
+ ret = -ENODEV;
+ goto err_init_slot;
+ }
+ }
+
+ /*
+ * Enable interrupts for command done, data over, data empty, card det,
+ * receive ready and error such as transmit, receive timeout, crc error
+ */
+ mci_writel(host, RINTSTS, 0xFFFFFFFF);
+ mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
+ SDMMC_INT_TXDR | SDMMC_INT_RXDR |
+ DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
+ mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
+
+ dev_info(&pdev->dev, "DW MMC controller at irq %d, "
+ "%d bit host data width\n", irq, width);
+ if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
+ dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
+
+ return 0;
+
+err_init_slot:
+ /* De-init any initialized slots */
+ while (i > 0) {
+ if (host->slot[i])
+ dw_mci_cleanup_slot(host->slot[i], i);
+ i--;
+ }
+ free_irq(irq, host);
+
+err_dmaunmap:
+ if (host->use_dma && host->dma_ops->exit)
+ host->dma_ops->exit(host);
+ dma_free_coherent(&host->pdev->dev, PAGE_SIZE,
+ host->sg_cpu, host->sg_dma);
+ iounmap(host->regs);
+
+err_freehost:
+ kfree(host);
+ return ret;
+}
+
+static int __exit dw_mci_remove(struct platform_device *pdev)
+{
+ struct dw_mci *host = platform_get_drvdata(pdev);
+ int i;
+
+ mci_writel(host, RINTSTS, 0xFFFFFFFF);
+ mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
+
+ platform_set_drvdata(pdev, NULL);
+
+ for (i = 0; i < host->num_slots; i++) {
+ dev_dbg(&pdev->dev, "remove slot %d\n", i);
+ if (host->slot[i])
+ dw_mci_cleanup_slot(host->slot[i], i);
+ }
+
+ /* disable clock to CIU */
+ mci_writel(host, CLKENA, 0);
+ mci_writel(host, CLKSRC, 0);
+
+ free_irq(platform_get_irq(pdev, 0), host);
+ dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+
+ if (host->use_dma && host->dma_ops->exit)
+ host->dma_ops->exit(host);
+
+ iounmap(host->regs);
+
+ kfree(host);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+/*
+ * TODO: we should probably disable the clock to the card in the suspend path.
+ */
+static int dw_mci_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+ int i, ret;
+ struct dw_mci *host = platform_get_drvdata(pdev);
+
+ for (i = 0; i < host->num_slots; i++) {
+ struct dw_mci_slot *slot = host->slot[i];
+ if (!slot)
+ continue;
+ ret = mmc_suspend_host(slot->mmc);
+ if (ret < 0) {
+ while (--i >= 0) {
+ slot = host->slot[i];
+ if (slot)
+ mmc_resume_host(host->slot[i]->mmc);
+ }
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int dw_mci_resume(struct platform_device *pdev)
+{
+ int i, ret;
+ struct dw_mci *host = platform_get_drvdata(pdev);
+
+ for (i = 0; i < host->num_slots; i++) {
+ struct dw_mci_slot *slot = host->slot[i];
+ if (!slot)
+ continue;
+ ret = mmc_resume_host(host->slot[i]->mmc);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+#else
+#define dw_mci_suspend NULL
+#define dw_mci_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver dw_mci_driver = {
+ .remove = __exit_p(dw_mci_remove),
+ .suspend = dw_mci_suspend,
+ .resume = dw_mci_resume,
+ .driver = {
+ .name = "dw_mmc",
+ },
+};
+
+static int __init dw_mci_init(void)
+{
+ return platform_driver_probe(&dw_mci_driver, dw_mci_probe);
+}
+
+static void __exit dw_mci_exit(void)
+{
+ platform_driver_unregister(&dw_mci_driver);
+}
+
+module_init(dw_mci_init);
+module_exit(dw_mci_exit);
+
+MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
+MODULE_AUTHOR("NXP Semiconductor VietNam");
+MODULE_AUTHOR("Imagination Technologies Ltd");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
new file mode 100644
index 0000000..5dd55a7
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc.h
@@ -0,0 +1,168 @@
+/*
+ * Synopsys DesignWare Multimedia Card Interface driver
+ * (Based on NXP driver for lpc 31xx)
+ *
+ * Copyright (C) 2009 NXP Semiconductors
+ * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
+ *
+ * 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.
+ */
+
+#ifndef _DW_MMC_H_
+#define _DW_MMC_H_
+
+#define SDMMC_CTRL 0x000
+#define SDMMC_PWREN 0x004
+#define SDMMC_CLKDIV 0x008
+#define SDMMC_CLKSRC 0x00c
+#define SDMMC_CLKENA 0x010
+#define SDMMC_TMOUT 0x014
+#define SDMMC_CTYPE 0x018
+#define SDMMC_BLKSIZ 0x01c
+#define SDMMC_BYTCNT 0x020
+#define SDMMC_INTMASK 0x024
+#define SDMMC_CMDARG 0x028
+#define SDMMC_CMD 0x02c
+#define SDMMC_RESP0 0x030
+#define SDMMC_RESP1 0x034
+#define SDMMC_RESP2 0x038
+#define SDMMC_RESP3 0x03c
+#define SDMMC_MINTSTS 0x040
+#define SDMMC_RINTSTS 0x044
+#define SDMMC_STATUS 0x048
+#define SDMMC_FIFOTH 0x04c
+#define SDMMC_CDETECT 0x050
+#define SDMMC_WRTPRT 0x054
+#define SDMMC_GPIO 0x058
+#define SDMMC_TCBCNT 0x05c
+#define SDMMC_TBBCNT 0x060
+#define SDMMC_DEBNCE 0x064
+#define SDMMC_USRID 0x068
+#define SDMMC_VERID 0x06c
+#define SDMMC_HCON 0x070
+#define SDMMC_BMOD 0x080
+#define SDMMC_PLDMND 0x084
+#define SDMMC_DBADDR 0x088
+#define SDMMC_IDSTS 0x08c
+#define SDMMC_IDINTEN 0x090
+#define SDMMC_DSCADDR 0x094
+#define SDMMC_BUFADDR 0x098
+#define SDMMC_DATA 0x100
+#define SDMMC_DATA_ADR 0x100
+
+/* shift bit field */
+#define _SBF(f, v) ((v) << (f))
+
+/* Control register defines */
+#define SDMMC_CTRL_USE_IDMAC BIT(25)
+#define SDMMC_CTRL_CEATA_INT_EN BIT(11)
+#define SDMMC_CTRL_SEND_AS_CCSD BIT(10)
+#define SDMMC_CTRL_SEND_CCSD BIT(9)
+#define SDMMC_CTRL_ABRT_READ_DATA BIT(8)
+#define SDMMC_CTRL_SEND_IRQ_RESP BIT(7)
+#define SDMMC_CTRL_READ_WAIT BIT(6)
+#define SDMMC_CTRL_DMA_ENABLE BIT(5)
+#define SDMMC_CTRL_INT_ENABLE BIT(4)
+#define SDMMC_CTRL_DMA_RESET BIT(2)
+#define SDMMC_CTRL_FIFO_RESET BIT(1)
+#define SDMMC_CTRL_RESET BIT(0)
+/* Clock Enable register defines */
+#define SDMMC_CLKEN_LOW_PWR BIT(16)
+#define SDMMC_CLKEN_ENABLE BIT(0)
+/* time-out register defines */
+#define SDMMC_TMOUT_DATA(n) _SBF(8, (n))
+#define SDMMC_TMOUT_DATA_MSK 0xFFFFFF00
+#define SDMMC_TMOUT_RESP(n) ((n) & 0xFF)
+#define SDMMC_TMOUT_RESP_MSK 0xFF
+/* card-type register defines */
+#define SDMMC_CTYPE_8BIT BIT(16)
+#define SDMMC_CTYPE_4BIT BIT(0)
+#define SDMMC_CTYPE_1BIT 0
+/* Interrupt status & mask register defines */
+#define SDMMC_INT_SDIO BIT(16)
+#define SDMMC_INT_EBE BIT(15)
+#define SDMMC_INT_ACD BIT(14)
+#define SDMMC_INT_SBE BIT(13)
+#define SDMMC_INT_HLE BIT(12)
+#define SDMMC_INT_FRUN BIT(11)
+#define SDMMC_INT_HTO BIT(10)
+#define SDMMC_INT_DTO BIT(9)
+#define SDMMC_INT_RTO BIT(8)
+#define SDMMC_INT_DCRC BIT(7)
+#define SDMMC_INT_RCRC BIT(6)
+#define SDMMC_INT_RXDR BIT(5)
+#define SDMMC_INT_TXDR BIT(4)
+#define SDMMC_INT_DATA_OVER BIT(3)
+#define SDMMC_INT_CMD_DONE BIT(2)
+#define SDMMC_INT_RESP_ERR BIT(1)
+#define SDMMC_INT_CD BIT(0)
+#define SDMMC_INT_ERROR 0xbfc2
+/* Command register defines */
+#define SDMMC_CMD_START BIT(31)
+#define SDMMC_CMD_CCS_EXP BIT(23)
+#define SDMMC_CMD_CEATA_RD BIT(22)
+#define SDMMC_CMD_UPD_CLK BIT(21)
+#define SDMMC_CMD_INIT BIT(15)
+#define SDMMC_CMD_STOP BIT(14)
+#define SDMMC_CMD_PRV_DAT_WAIT BIT(13)
+#define SDMMC_CMD_SEND_STOP BIT(12)
+#define SDMMC_CMD_STRM_MODE BIT(11)
+#define SDMMC_CMD_DAT_WR BIT(10)
+#define SDMMC_CMD_DAT_EXP BIT(9)
+#define SDMMC_CMD_RESP_CRC BIT(8)
+#define SDMMC_CMD_RESP_LONG BIT(7)
+#define SDMMC_CMD_RESP_EXP BIT(6)
+#define SDMMC_CMD_INDX(n) ((n) & 0x1F)
+/* Status register defines */
+#define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FF)
+#define SDMMC_FIFO_SZ 32
+/* Internal DMAC interrupt defines */
+#define SDMMC_IDMAC_INT_AI BIT(9)
+#define SDMMC_IDMAC_INT_NI BIT(8)
+#define SDMMC_IDMAC_INT_CES BIT(5)
+#define SDMMC_IDMAC_INT_DU BIT(4)
+#define SDMMC_IDMAC_INT_FBE BIT(2)
+#define SDMMC_IDMAC_INT_RI BIT(1)
+#define SDMMC_IDMAC_INT_TI BIT(0)
+/* Internal DMAC bus mode bits */
+#define SDMMC_IDMAC_ENABLE BIT(7)
+#define SDMMC_IDMAC_FB BIT(1)
+#define SDMMC_IDMAC_SWRESET BIT(0)
+
+/* Register access macros */
+#define mci_readl(dev, reg) \
+ __raw_readl(dev->regs + SDMMC_##reg)
+#define mci_writel(dev, reg, value) \
+ __raw_writel((value), dev->regs + SDMMC_##reg)
+
+/* 16-bit FIFO access macros */
+#define mci_readw(dev, reg) \
+ __raw_readw(dev->regs + SDMMC_##reg)
+#define mci_writew(dev, reg, value) \
+ __raw_writew((value), dev->regs + SDMMC_##reg)
+
+/* 64-bit FIFO access macros */
+#ifdef readq
+#define mci_readq(dev, reg) \
+ __raw_readq(dev->regs + SDMMC_##reg)
+#define mci_writeq(dev, reg, value) \
+ __raw_writeq((value), dev->regs + SDMMC_##reg)
+#else
+/*
+ * Dummy readq implementation for architectures that don't define it.
+ *
+ * We would assume that none of these architectures would configure
+ * the IP block with a 64bit FIFO width, so this code will never be
+ * executed on those machines. Defining these macros here keeps the
+ * rest of the code free from ifdefs.
+ */
+#define mci_readq(dev, reg) \
+ (*(volatile u64 __force *)(dev->regs + SDMMC_##reg))
+#define mci_writeq(dev, reg, value) \
+ (*(volatile u64 __force *)(dev->regs + SDMMC_##reg) = value)
+#endif
+
+#endif /* _DW_MMC_H_ */
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
new file mode 100644
index 0000000..16b0261
--- /dev/null
+++ b/include/linux/mmc/dw_mmc.h
@@ -0,0 +1,217 @@
+/*
+ * Synopsys DesignWare Multimedia Card Interface driver
+ * (Based on NXP driver for lpc 31xx)
+ *
+ * Copyright (C) 2009 NXP Semiconductors
+ * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_MMC_DW_MMC_H_
+#define _LINUX_MMC_DW_MMC_H_
+
+#define MAX_MCI_SLOTS 2
+
+enum dw_mci_state {
+ STATE_IDLE = 0,
+ STATE_SENDING_CMD,
+ STATE_SENDING_DATA,
+ STATE_DATA_BUSY,
+ STATE_SENDING_STOP,
+ STATE_DATA_ERROR,
+};
+
+enum {
+ EVENT_CMD_COMPLETE = 0,
+ EVENT_XFER_COMPLETE,
+ EVENT_DATA_COMPLETE,
+ EVENT_DATA_ERROR,
+ EVENT_XFER_ERROR
+};
+
+struct mmc_data;
+
+/**
+ * struct dw_mci - MMC controller state shared between all slots
+ * @lock: Spinlock protecting the queue and associated data.
+ * @regs: Pointer to MMIO registers.
+ * @sg: Scatterlist entry currently being processed by PIO code, if any.
+ * @pio_offset: Offset into the current scatterlist entry.
+ * @cur_slot: The slot which is currently using the controller.
+ * @mrq: The request currently being processed on @cur_slot,
+ * or NULL if the controller is idle.
+ * @cmd: The command currently being sent to the card, or NULL.
+ * @data: The data currently being transferred, or NULL if no data
+ * transfer is in progress.
+ * @use_dma: Whether DMA channel is initialized or not.
+ * @sg_dma: Bus address of DMA buffer.
+ * @sg_cpu: Virtual address of DMA buffer.
+ * @dma_ops: Pointer to platform-specific DMA callbacks.
+ * @cmd_status: Snapshot of SR taken upon completion of the current
+ * command. Only valid when EVENT_CMD_COMPLETE is pending.
+ * @data_status: Snapshot of SR taken upon completion of the current
+ * data transfer. Only valid when EVENT_DATA_COMPLETE or
+ * EVENT_DATA_ERROR is pending.
+ * @stop_cmdr: Value to be loaded into CMDR when the stop command is
+ * to be sent.
+ * @dir_status: Direction of current transfer.
+ * @tasklet: Tasklet running the request state machine.
+ * @card_tasklet: Tasklet handling card detect.
+ * @pending_events: Bitmask of events flagged by the interrupt handler
+ * to be processed by the tasklet.
+ * @completed_events: Bitmask of events which the state machine has
+ * processed.
+ * @state: Tasklet state.
+ * @queue: List of slots waiting for access to the controller.
+ * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
+ * rate and timeout calculations.
+ * @current_speed: Configured rate of the controller.
+ * @num_slots: Number of slots available.
+ * @pdev: Platform device associated with the MMC controller.
+ * @pdata: Platform data associated with the MMC controller.
+ * @slot: Slots sharing this MMC controller.
+ * @data_shift: log2 of FIFO item size.
+ * @push_data: Pointer to FIFO push function.
+ * @pull_data: Pointer to FIFO pull function.
+ * @quirks: Set of quirks that apply to specific versions of the IP.
+ *
+ * Locking
+ * =======
+ *
+ * @lock is a softirq-safe spinlock protecting @queue as well as
+ * @cur_slot, @mrq and @state. These must always be updated
+ * at the same time while holding @lock.
+ *
+ * The @mrq field of struct dw_mci_slot is also protected by @lock,
+ * and must always be written at the same time as the slot is added to
+ * @queue.
+ *
+ * @pending_events and @completed_events are accessed using atomic bit
+ * operations, so they don't need any locking.
+ *
+ * None of the fields touched by the interrupt handler need any
+ * locking. However, ordering is important: Before EVENT_DATA_ERROR or
+ * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
+ * interrupts must be disabled and @data_status updated with a
+ * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
+ * CMDRDY interupt must be disabled and @cmd_status updated with a
+ * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
+ * bytes_xfered field of @data must be written. This is ensured by
+ * using barriers.
+ */
+struct dw_mci {
+ spinlock_t lock;
+ void __iomem *regs;
+
+ struct scatterlist *sg;
+ unsigned int pio_offset;
+
+ struct dw_mci_slot *cur_slot;
+ struct mmc_request *mrq;
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+
+ /* DMA interface members*/
+ int use_dma;
+
+ dma_addr_t sg_dma;
+ void *sg_cpu;
+ struct dw_mci_dma_ops *dma_ops;
+#ifdef CONFIG_MMC_DW_IDMAC
+ unsigned int ring_size;
+#else
+ struct dw_mci_dma_data *dma_data;
+#endif
+ u32 cmd_status;
+ u32 data_status;
+ u32 stop_cmdr;
+ u32 dir_status;
+ struct tasklet_struct tasklet;
+ struct tasklet_struct card_tasklet;
+ unsigned long pending_events;
+ unsigned long completed_events;
+ enum dw_mci_state state;
+ struct list_head queue;
+
+ u32 bus_hz;
+ u32 current_speed;
+ u32 num_slots;
+ struct platform_device *pdev;
+ struct dw_mci_board *pdata;
+ struct dw_mci_slot *slot[MAX_MCI_SLOTS];
+
+ /* FIFO push and pull */
+ int data_shift;
+ void (*push_data)(struct dw_mci *host, void *buf, int cnt);
+ void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
+
+ /* Workaround flags */
+ u32 quirks;
+};
+
+/* DMA ops for Internal/External DMAC interface */
+struct dw_mci_dma_ops {
+ /* DMA Ops */
+ int (*init)(struct dw_mci *host);
+ void (*start)(struct dw_mci *host, unsigned int sg_len);
+ void (*complete)(struct dw_mci *host);
+ void (*stop)(struct dw_mci *host);
+ void (*cleanup)(struct dw_mci *host);
+ void (*exit)(struct dw_mci *host);
+};
+
+/* IP Quirks/flags. */
+/* No special quirks or flags to cater for */
+#define DW_MCI_QUIRK_NONE 0
+/* DTO fix for command transmission with IDMAC configured */
+#define DW_MCI_QUIRK_IDMAC_DTO 1
+/* delay needed between retries on some 2.11a implementations */
+#define DW_MCI_QUIRK_RETRY_DELAY 2
+/* High Speed Capable - Supports HS cards (upto 50MHz) */
+#define DW_MCI_QUIRK_HIGHSPEED 4
+
+
+struct dma_pdata;
+
+struct block_settings {
+ unsigned short max_segs; /* see blk_queue_max_segments */
+ unsigned int max_blk_size; /* maximum size of one mmc block */
+ unsigned int max_blk_count; /* maximum number of blocks in one req*/
+ unsigned int max_req_size; /* maximum number of bytes in one req*/
+ unsigned int max_seg_size; /* see blk_queue_max_segment_size */
+};
+
+/* Board platform data */
+struct dw_mci_board {
+ u32 num_slots;
+
+ u32 quirks; /* Workaround / Quirk flags */
+ unsigned int bus_hz; /* Bus speed */
+
+ /* delay in mS before detecting cards after interrupt */
+ u32 detect_delay_ms;
+
+ int (*init)(u32 slot_id, irq_handler_t , void *);
+ int (*get_ro)(u32 slot_id);
+ int (*get_cd)(u32 slot_id);
+ int (*get_ocr)(u32 slot_id);
+ int (*get_bus_wd)(u32 slot_id);
+ /*
+ * Enable power to selected slot and set voltage to desired level.
+ * Voltage levels are specified using MMC_VDD_xxx defines defined
+ * in linux/mmc/host.h file.
+ */
+ void (*setpower)(u32 slot_id, u32 volt);
+ void (*exit)(u32 slot_id);
+ void (*select_slot)(u32 slot_id);
+
+ struct dw_mci_dma_ops *dma_ops;
+ struct dma_pdata *data;
+ struct block_settings *blk_settings;
+};
+
+#endif /* _LINUX_MMC_DW_MMC_H_ */
--
1.7.2.2
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