--- /dev/null
+/*
+ * linux/drivers/mmc/sdhci.c - Secure Digital Host Controller Interface driver
+ *
+ * Copyright (C) 2005-2006 Pierre Ossman, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+ /*
+ * Note that PIO transfer is rather crappy atm. The buffer full/empty
+ * interrupts aren't reliable so we currently transfer the entire buffer
+ * directly. Patches to solve the problem are welcome.
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/scatterlist.h>
+
+#include "sdhci.h"
+
+#define DRIVER_NAME "sdhci"
+#define DRIVER_VERSION "0.11"
+
+#define BUGMAIL "<sdhci-devel@list.drzeus.cx>"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(f, x...) \
+ printk(KERN_DEBUG DRIVER_NAME " [%s()]: " f, __func__,## x)
+#else
+#define DBG(f, x...) do { } while (0)
+#endif
+
+static const struct pci_device_id pci_ids[] __devinitdata = {
+ /* handle any SD host controller */
+ {PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)},
+ { /* end: all zeroes */ },
+};
+
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
+static void sdhci_finish_data(struct sdhci_host *);
+
+static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
+static void sdhci_finish_command(struct sdhci_host *);
+
+static void sdhci_dumpregs(struct sdhci_host *host)
+{
+ printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
+
+ printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
+ readl(host->ioaddr + SDHCI_DMA_ADDRESS),
+ readw(host->ioaddr + SDHCI_HOST_VERSION));
+ printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
+ readw(host->ioaddr + SDHCI_BLOCK_SIZE),
+ readw(host->ioaddr + SDHCI_BLOCK_COUNT));
+ printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
+ readl(host->ioaddr + SDHCI_ARGUMENT),
+ readw(host->ioaddr + SDHCI_TRANSFER_MODE));
+ printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
+ readl(host->ioaddr + SDHCI_PRESENT_STATE),
+ readb(host->ioaddr + SDHCI_HOST_CONTROL));
+ printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
+ readb(host->ioaddr + SDHCI_POWER_CONTROL),
+ readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
+ printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
+ readb(host->ioaddr + SDHCI_WALK_UP_CONTROL),
+ readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
+ printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
+ readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
+ readl(host->ioaddr + SDHCI_INT_STATUS));
+ printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
+ readl(host->ioaddr + SDHCI_INT_ENABLE),
+ readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
+ printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
+ readw(host->ioaddr + SDHCI_ACMD12_ERR),
+ readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
+ printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Max curr: 0x%08x\n",
+ readl(host->ioaddr + SDHCI_CAPABILITIES),
+ readl(host->ioaddr + SDHCI_MAX_CURRENT));
+
+ printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
+}
+
+/*****************************************************************************\
+ * *
+ * Low level functions *
+ * *
+\*****************************************************************************/
+
+static void sdhci_reset(struct sdhci_host *host, u8 mask)
+{
+ writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
+
+ if (mask & SDHCI_RESET_ALL) {
+ host->clock = 0;
+
+ mdelay(50);
+ }
+}
+
+static void sdhci_init(struct sdhci_host *host)
+{
+ u32 intmask;
+
+ sdhci_reset(host, SDHCI_RESET_ALL);
+
+ intmask = ~(SDHCI_INT_CARD_INT | SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
+
+ writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
+ writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+
+ /* This is unknown magic. */
+ writeb(0xE, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
+}
+
+static void sdhci_activate_led(struct sdhci_host *host)
+{
+ u8 ctrl;
+
+ ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
+ ctrl |= SDHCI_CTRL_LED;
+ writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+}
+
+static void sdhci_deactivate_led(struct sdhci_host *host)
+{
+ u8 ctrl;
+
+ ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
+ ctrl &= ~SDHCI_CTRL_LED;
+ writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+}
+
+/*****************************************************************************\
+ * *
+ * Core functions *
+ * *
+\*****************************************************************************/
+
+static inline char* sdhci_kmap_sg(struct sdhci_host* host)
+{
+ host->mapped_sg = kmap_atomic(host->cur_sg->page, KM_BIO_SRC_IRQ);
+ return host->mapped_sg + host->cur_sg->offset;
+}
+
+static inline void sdhci_kunmap_sg(struct sdhci_host* host)
+{
+ kunmap_atomic(host->mapped_sg, KM_BIO_SRC_IRQ);
+}
+
+static inline int sdhci_next_sg(struct sdhci_host* host)
+{
+ /*
+ * Skip to next SG entry.
+ */
+ host->cur_sg++;
+ host->num_sg--;
+
+ /*
+ * Any entries left?
+ */
+ if (host->num_sg > 0) {
+ host->offset = 0;
+ host->remain = host->cur_sg->length;
+ }
+
+ return host->num_sg;
+}
+
+static void sdhci_transfer_pio(struct sdhci_host *host)
+{
+ char *buffer;
+ u32 mask;
+ int bytes, size;
+ unsigned long max_jiffies;
+
+ BUG_ON(!host->data);
+
+ if (host->num_sg == 0)
+ return;
+
+ bytes = 0;
+ if (host->data->flags & MMC_DATA_READ)
+ mask = SDHCI_DATA_AVAILABLE;
+ else
+ mask = SDHCI_SPACE_AVAILABLE;
+
+ buffer = sdhci_kmap_sg(host) + host->offset;
+
+ /* Transfer shouldn't take more than 5 s */
+ max_jiffies = jiffies + HZ * 5;
+
+ while (host->size > 0) {
+ if (time_after(jiffies, max_jiffies)) {
+ printk(KERN_ERR "%s: PIO transfer stalled. "
+ "Please report this to "
+ BUGMAIL ".\n", mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+
+ sdhci_kunmap_sg(host);
+
+ host->data->error = MMC_ERR_FAILED;
+ sdhci_finish_data(host);
+ return;
+ }
+
+ if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask))
+ continue;
+
+ size = min(host->size, host->remain);
+
+ if (size >= 4) {
+ if (host->data->flags & MMC_DATA_READ)
+ *(u32*)buffer = readl(host->ioaddr + SDHCI_BUFFER);
+ else
+ writel(*(u32*)buffer, host->ioaddr + SDHCI_BUFFER);
+ size = 4;
+ } else if (size >= 2) {
+ if (host->data->flags & MMC_DATA_READ)
+ *(u16*)buffer = readw(host->ioaddr + SDHCI_BUFFER);
+ else
+ writew(*(u16*)buffer, host->ioaddr + SDHCI_BUFFER);
+ size = 2;
+ } else {
+ if (host->data->flags & MMC_DATA_READ)
+ *(u8*)buffer = readb(host->ioaddr + SDHCI_BUFFER);
+ else
+ writeb(*(u8*)buffer, host->ioaddr + SDHCI_BUFFER);
+ size = 1;
+ }
+
+ buffer += size;
+ host->offset += size;
+ host->remain -= size;
+
+ bytes += size;
+ host->size -= size;
+
+ if (host->remain == 0) {
+ sdhci_kunmap_sg(host);
+ if (sdhci_next_sg(host) == 0) {
+ DBG("PIO transfer: %d bytes\n", bytes);
+ return;
+ }
+ buffer = sdhci_kmap_sg(host);
+ }
+ }
+
+ sdhci_kunmap_sg(host);
+
+ DBG("PIO transfer: %d bytes\n", bytes);
+}
+
+static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
+{
+ u16 mode;
+
+ WARN_ON(host->data);
+
+ if (data == NULL) {
+ writew(0, host->ioaddr + SDHCI_TRANSFER_MODE);
+ return;
+ }
+
+ DBG("blksz %04x blks %04x flags %08x\n",
+ 1 << data->blksz_bits, data->blocks, data->flags);
+ DBG("tsac %d ms nsac %d clk\n",
+ data->timeout_ns / 1000000, data->timeout_clks);
+
+ mode = SDHCI_TRNS_BLK_CNT_EN;
+ if (data->blocks > 1)
+ mode |= SDHCI_TRNS_MULTI;
+ if (data->flags & MMC_DATA_READ)
+ mode |= SDHCI_TRNS_READ;
+ if (host->flags & SDHCI_USE_DMA)
+ mode |= SDHCI_TRNS_DMA;
+
+ writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
+
+ writew(1 << data->blksz_bits, host->ioaddr + SDHCI_BLOCK_SIZE);
+ writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
+
+ if (host->flags & SDHCI_USE_DMA) {
+ int count;
+
+ count = pci_map_sg(host->chip->pdev, data->sg, data->sg_len,
+ (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
+ BUG_ON(count != 1);
+
+ writel(sg_dma_address(data->sg), host->ioaddr + SDHCI_DMA_ADDRESS);
+ } else {
+ host->size = (1 << data->blksz_bits) * data->blocks;
+
+ host->cur_sg = data->sg;
+ host->num_sg = data->sg_len;
+
+ host->offset = 0;
+ host->remain = host->cur_sg->length;
+ }
+}
+
+static void sdhci_finish_data(struct sdhci_host *host)
+{
+ struct mmc_data *data;
+ u32 intmask;
+ u16 blocks;
+
+ BUG_ON(!host->data);
+
+ data = host->data;
+ host->data = NULL;
+
+ if (host->flags & SDHCI_USE_DMA) {
+ pci_unmap_sg(host->chip->pdev, data->sg, data->sg_len,
+ (data->flags & MMC_DATA_READ)?PCI_DMA_FROMDEVICE:PCI_DMA_TODEVICE);
+ } else {
+ intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
+ intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
+ writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+
+ intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
+ intmask &= ~(SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL);
+ writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
+ }
+
+ /*
+ * Controller doesn't count down when in single block mode.
+ */
+ if ((data->blocks == 1) && (data->error == MMC_ERR_NONE))
+ blocks = 0;
+ else
+ blocks = readw(host->ioaddr + SDHCI_BLOCK_COUNT);
+ data->bytes_xfered = (1 << data->blksz_bits) * (data->blocks - blocks);
+
+ if ((data->error == MMC_ERR_NONE) && blocks) {
+ printk(KERN_ERR "%s: Controller signalled completion even "
+ "though there were blocks left. Please report this "
+ "to " BUGMAIL ".\n", mmc_hostname(host->mmc));
+ data->error = MMC_ERR_FAILED;
+ }
+
+ if (host->size != 0) {
+ printk(KERN_ERR "%s: %d bytes were left untransferred. "
+ "Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc), host->size);
+ data->error = MMC_ERR_FAILED;
+ }
+
+ DBG("Ending data transfer (%d bytes)\n", data->bytes_xfered);
+
+ if (data->stop) {
+ /*
+ * The controller needs a reset of internal state machines
+ * upon error conditions.
+ */
+ if (data->error != MMC_ERR_NONE) {
+ sdhci_reset(host, SDHCI_RESET_CMD);
+ sdhci_reset(host, SDHCI_RESET_DATA);
+ }
+
+ sdhci_send_command(host, data->stop);
+ } else
+ tasklet_schedule(&host->finish_tasklet);
+}
+
+static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+{
+ int flags;
+ u32 present;
+ unsigned long max_jiffies;
+
+ WARN_ON(host->cmd);
+
+ DBG("Sending cmd (%x)\n", cmd->opcode);
+
+ /* Wait max 10 ms */
+ max_jiffies = jiffies + (HZ + 99)/100;
+ do {
+ if (time_after(jiffies, max_jiffies)) {
+ printk(KERN_ERR "%s: Controller never released "
+ "inhibit bits. Please report this to "
+ BUGMAIL ".\n", mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ cmd->error = MMC_ERR_FAILED;
+ tasklet_schedule(&host->finish_tasklet);
+ return;
+ }
+ present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
+ } while (present & (SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT));
+
+ mod_timer(&host->timer, jiffies + 10 * HZ);
+
+ host->cmd = cmd;
+
+ sdhci_prepare_data(host, cmd->data);
+
+ writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
+
+ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
+ printk(KERN_ERR "%s: Unsupported response type! "
+ "Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ cmd->error = MMC_ERR_INVALID;
+ tasklet_schedule(&host->finish_tasklet);
+ return;
+ }
+
+ if (!(cmd->flags & MMC_RSP_PRESENT))
+ flags = SDHCI_CMD_RESP_NONE;
+ else if (cmd->flags & MMC_RSP_136)
+ flags = SDHCI_CMD_RESP_LONG;
+ else if (cmd->flags & MMC_RSP_BUSY)
+ flags = SDHCI_CMD_RESP_SHORT_BUSY;
+ else
+ flags = SDHCI_CMD_RESP_SHORT;
+
+ if (cmd->flags & MMC_RSP_CRC)
+ flags |= SDHCI_CMD_CRC;
+ if (cmd->flags & MMC_RSP_OPCODE)
+ flags |= SDHCI_CMD_INDEX;
+ if (cmd->data)
+ flags |= SDHCI_CMD_DATA;
+
+ writel(SDHCI_MAKE_CMD(cmd->opcode, flags),
+ host->ioaddr + SDHCI_COMMAND);
+}
+
+static void sdhci_finish_command(struct sdhci_host *host)
+{
+ int i;
+
+ BUG_ON(host->cmd == NULL);
+
+ if (host->cmd->flags & MMC_RSP_PRESENT) {
+ if (host->cmd->flags & MMC_RSP_136) {
+ /* CRC is stripped so we need to do some shifting. */
+ for (i = 0;i < 4;i++) {
+ host->cmd->resp[i] = readl(host->ioaddr +
+ SDHCI_RESPONSE + (3-i)*4) << 8;
+ if (i != 3)
+ host->cmd->resp[i] |=
+ readb(host->ioaddr +
+ SDHCI_RESPONSE + (3-i)*4-1);
+ }
+ } else {
+ host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
+ }
+ }
+
+ host->cmd->error = MMC_ERR_NONE;
+
+ DBG("Ending cmd (%x)\n", host->cmd->opcode);
+
+ if (host->cmd->data) {
+ u32 intmask;
+
+ host->data = host->cmd->data;
+
+ if (!(host->flags & SDHCI_USE_DMA)) {
+ /*
+ * Don't enable the interrupts until now to make sure we
+ * get stable handling of the FIFO.
+ */
+ intmask = readl(host->ioaddr + SDHCI_INT_ENABLE);
+ intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
+ writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
+
+ intmask = readl(host->ioaddr + SDHCI_SIGNAL_ENABLE);
+ intmask |= SDHCI_INT_BUF_EMPTY | SDHCI_INT_BUF_FULL;
+ writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+
+ /*
+ * The buffer interrupts are to unreliable so we
+ * start the transfer immediatly.
+ */
+ sdhci_transfer_pio(host);
+ }
+ } else
+ tasklet_schedule(&host->finish_tasklet);
+
+ host->cmd = NULL;
+}
+
+static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ int div;
+ u16 clk;
+ unsigned long max_jiffies;
+
+ if (clock == host->clock)
+ return;
+
+ writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+ if (clock == 0)
+ goto out;
+
+ for (div = 1;div < 256;div *= 2) {
+ if ((host->max_clk / div) <= clock)
+ break;
+ }
+ div >>= 1;
+
+ clk = div << SDHCI_DIVIDER_SHIFT;
+ clk |= SDHCI_CLOCK_INT_EN;
+ writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+ /* Wait max 10 ms */
+ max_jiffies = jiffies + (HZ + 99)/100;
+ do {
+ if (time_after(jiffies, max_jiffies)) {
+ printk(KERN_ERR "%s: Internal clock never stabilised. "
+ "Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ return;
+ }
+ clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL);
+ } while (!(clk & SDHCI_CLOCK_INT_STABLE));
+
+ clk |= SDHCI_CLOCK_CARD_EN;
+ writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
+
+out:
+ host->clock = clock;
+}
+
+/*****************************************************************************\
+ * *
+ * MMC callbacks *
+ * *
+\*****************************************************************************/
+
+static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+
+ host = mmc_priv(mmc);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ WARN_ON(host->mrq != NULL);
+
+ sdhci_activate_led(host);
+
+ host->mrq = mrq;
+
+ if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
+ host->mrq->cmd->error = MMC_ERR_TIMEOUT;
+ tasklet_schedule(&host->finish_tasklet);
+ } else
+ sdhci_send_command(host, mrq->cmd);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+ u8 ctrl;
+
+ host = mmc_priv(mmc);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ DBG("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
+ ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
+ ios->vdd, ios->bus_width);
+
+ /*
+ * Reset the chip on each power off.
+ * Should clear out any weird states.
+ */
+ if (ios->power_mode == MMC_POWER_OFF) {
+ writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
+ spin_unlock_irqrestore(&host->lock, flags);
+ sdhci_init(host);
+ spin_lock_irqsave(&host->lock, flags);
+ }
+
+ sdhci_set_clock(host, ios->clock);
+
+ if (ios->power_mode == MMC_POWER_OFF)
+ writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
+ else
+ writeb(0xFF, host->ioaddr + SDHCI_POWER_CONTROL);
+
+ ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
+ if (ios->bus_width == MMC_BUS_WIDTH_4)
+ ctrl |= SDHCI_CTRL_4BITBUS;
+ else
+ ctrl &= ~SDHCI_CTRL_4BITBUS;
+ writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int sdhci_get_ro(struct mmc_host *mmc)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+ int present;
+
+ host = mmc_priv(mmc);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return !(present & SDHCI_WRITE_PROTECT);
+}
+
+static struct mmc_host_ops sdhci_ops = {
+ .request = sdhci_request,
+ .set_ios = sdhci_set_ios,
+ .get_ro = sdhci_get_ro,
+};
+
+/*****************************************************************************\
+ * *
+ * Tasklets *
+ * *
+\*****************************************************************************/
+
+static void sdhci_tasklet_card(unsigned long param)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+
+ host = (struct sdhci_host*)param;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
+ if (host->mrq) {
+ printk(KERN_ERR "%s: Card removed during transfer!\n",
+ mmc_hostname(host->mmc));
+ printk(KERN_ERR "%s: Resetting controller.\n",
+ mmc_hostname(host->mmc));
+
+ sdhci_reset(host, SDHCI_RESET_CMD);
+ sdhci_reset(host, SDHCI_RESET_DATA);
+
+ host->mrq->cmd->error = MMC_ERR_FAILED;
+ tasklet_schedule(&host->finish_tasklet);
+ }
+ }
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ mmc_detect_change(host->mmc, msecs_to_jiffies(500));
+}
+
+static void sdhci_tasklet_finish(unsigned long param)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+ struct mmc_request *mrq;
+
+ host = (struct sdhci_host*)param;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ del_timer(&host->timer);
+
+ mrq = host->mrq;
+
+ DBG("Ending request, cmd (%x)\n", mrq->cmd->opcode);
+
+ /*
+ * The controller needs a reset of internal state machines
+ * upon error conditions.
+ */
+ if ((mrq->cmd->error != MMC_ERR_NONE) ||
+ (mrq->data && ((mrq->data->error != MMC_ERR_NONE) ||
+ (mrq->data->stop && (mrq->data->stop->error != MMC_ERR_NONE))))) {
+ sdhci_reset(host, SDHCI_RESET_CMD);
+ sdhci_reset(host, SDHCI_RESET_DATA);
+ }
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+ host->data = NULL;
+
+ sdhci_deactivate_led(host);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+static void sdhci_timeout_timer(unsigned long data)
+{
+ struct sdhci_host *host;
+ unsigned long flags;
+
+ host = (struct sdhci_host*)data;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (host->mrq) {
+ printk(KERN_ERR "%s: Timeout waiting for hardware interrupt. "
+ "Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+
+ if (host->data) {
+ host->data->error = MMC_ERR_TIMEOUT;
+ sdhci_finish_data(host);
+ } else {
+ if (host->cmd)
+ host->cmd->error = MMC_ERR_TIMEOUT;
+ else
+ host->mrq->cmd->error = MMC_ERR_TIMEOUT;
+
+ tasklet_schedule(&host->finish_tasklet);
+ }
+ }
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+/*****************************************************************************\
+ * *
+ * Interrupt handling *
+ * *
+\*****************************************************************************/
+
+static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
+{
+ BUG_ON(intmask == 0);
+
+ if (!host->cmd) {
+ printk(KERN_ERR "%s: Got command interrupt even though no "
+ "command operation was in progress.\n",
+ mmc_hostname(host->mmc));
+ printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ return;
+ }
+
+ if (intmask & SDHCI_INT_RESPONSE)
+ sdhci_finish_command(host);
+ else {
+ if (intmask & SDHCI_INT_TIMEOUT)
+ host->cmd->error = MMC_ERR_TIMEOUT;
+ else if (intmask & SDHCI_INT_CRC)
+ host->cmd->error = MMC_ERR_BADCRC;
+ else if (intmask & (SDHCI_INT_END_BIT | SDHCI_INT_INDEX))
+ host->cmd->error = MMC_ERR_FAILED;
+ else
+ host->cmd->error = MMC_ERR_INVALID;
+
+ tasklet_schedule(&host->finish_tasklet);
+ }
+}
+
+static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
+{
+ BUG_ON(intmask == 0);
+
+ if (!host->data) {
+ /*
+ * A data end interrupt is sent together with the response
+ * for the stop command.
+ */
+ if (intmask & SDHCI_INT_DATA_END)
+ return;
+
+ printk(KERN_ERR "%s: Got data interrupt even though no "
+ "data operation was in progress.\n",
+ mmc_hostname(host->mmc));
+ printk(KERN_ERR "%s: Please report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+
+ return;
+ }
+
+ if (intmask & SDHCI_INT_DATA_TIMEOUT)
+ host->data->error = MMC_ERR_TIMEOUT;
+ else if (intmask & SDHCI_INT_DATA_CRC)
+ host->data->error = MMC_ERR_BADCRC;
+ else if (intmask & SDHCI_INT_DATA_END_BIT)
+ host->data->error = MMC_ERR_FAILED;
+
+ if (host->data->error != MMC_ERR_NONE)
+ sdhci_finish_data(host);
+ else {
+ if (intmask & (SDHCI_INT_BUF_FULL | SDHCI_INT_BUF_EMPTY))
+ sdhci_transfer_pio(host);
+
+ if (intmask & SDHCI_INT_DATA_END)
+ sdhci_finish_data(host);
+ }
+}
+
+static irqreturn_t sdhci_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ irqreturn_t result;
+ struct sdhci_host* host = dev_id;
+ u32 intmask;
+
+ spin_lock(&host->lock);
+
+ intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
+
+ if (!intmask) {
+ result = IRQ_NONE;
+ goto out;
+ }
+
+ DBG("*** %s got interrupt: 0x%08x\n", host->slot_descr, intmask);
+
+ if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE))
+ tasklet_schedule(&host->card_tasklet);
+
+ if (intmask & SDHCI_INT_CMD_MASK) {
+ sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
+
+ writel(intmask & SDHCI_INT_CMD_MASK,
+ host->ioaddr + SDHCI_INT_STATUS);
+ }
+
+ if (intmask & SDHCI_INT_DATA_MASK) {
+ sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
+
+ writel(intmask & SDHCI_INT_DATA_MASK,
+ host->ioaddr + SDHCI_INT_STATUS);
+ }
+
+ intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
+
+ if (intmask & SDHCI_INT_CARD_INT) {
+ printk(KERN_ERR "%s: Unexpected card interrupt. Please "
+ "report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ }
+
+ if (intmask & SDHCI_INT_BUS_POWER) {
+ printk(KERN_ERR "%s: Unexpected bus power interrupt. Please "
+ "report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+ }
+
+ if (intmask & SDHCI_INT_ACMD12ERR) {
+ printk(KERN_ERR "%s: Unexpected auto CMD12 error. Please "
+ "report this to " BUGMAIL ".\n",
+ mmc_hostname(host->mmc));
+ sdhci_dumpregs(host);
+
+ writew(~0, host->ioaddr + SDHCI_ACMD12_ERR);
+ }
+
+ if (intmask)
+ writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
+
+ result = IRQ_HANDLED;
+
+out:
+ spin_unlock(&host->lock);
+
+ return result;
+}
+
+/*****************************************************************************\
+ * *
+ * Suspend/resume *
+ * *
+\*****************************************************************************/
+
+#ifdef CONFIG_PM
+
+static int sdhci_suspend (struct pci_dev *pdev, pm_message_t state)
+{
+ struct sdhci_chip *chip;
+ int i, ret;
+
+ chip = pci_get_drvdata(pdev);
+ if (!chip)
+ return 0;
+
+ DBG("Suspending...\n");
+
+ for (i = 0;i < chip->num_slots;i++) {
+ if (!chip->hosts[i])
+ continue;
+ ret = mmc_suspend_host(chip->hosts[i]->mmc, state);
+ if (ret) {
+ for (i--;i >= 0;i--)
+ mmc_resume_host(chip->hosts[i]->mmc);
+ return ret;
+ }
+ }
+
+ pci_save_state(pdev);
+ pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+ return 0;
+}
+
+static int sdhci_resume (struct pci_dev *pdev)
+{
+ struct sdhci_chip *chip;
+ int i, ret;
+
+ chip = pci_get_drvdata(pdev);
+ if (!chip)
+ return 0;
+
+ DBG("Resuming...\n");
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_restore_state(pdev);
+ pci_enable_device(pdev);
+
+ for (i = 0;i < chip->num_slots;i++) {
+ if (!chip->hosts[i])
+ continue;
+ if (chip->hosts[i]->flags & SDHCI_USE_DMA)
+ pci_set_master(pdev);
+ sdhci_init(chip->hosts[i]);
+ ret = mmc_resume_host(chip->hosts[i]->mmc);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+#else /* CONFIG_PM */
+
+#define sdhci_suspend NULL
+#define sdhci_resume NULL
+
+#endif /* CONFIG_PM */
+
+/*****************************************************************************\
+ * *
+ * Device probing/removal *
+ * *
+\*****************************************************************************/
+
+static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
+{
+ int ret;
+ struct sdhci_chip *chip;
+ struct mmc_host *mmc;
+ struct sdhci_host *host;
+
+ u8 first_bar;
+ unsigned int caps;
+
+ chip = pci_get_drvdata(pdev);
+ BUG_ON(!chip);
+
+ ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &first_bar);
+ if (ret)
+ return ret;
+
+ first_bar &= PCI_SLOT_INFO_FIRST_BAR_MASK;
+
+ if (first_bar > 5) {
+ printk(KERN_ERR DRIVER_NAME ": Invalid first BAR. Aborting.\n");
+ return -ENODEV;
+ }
+
+ if (!(pci_resource_flags(pdev, first_bar + slot) & IORESOURCE_MEM)) {
+ printk(KERN_ERR DRIVER_NAME ": BAR is not iomem. Aborting.\n");
+ return -ENODEV;
+ }
+
+ if (pci_resource_len(pdev, first_bar + slot) != 0x100) {
+ printk(KERN_ERR DRIVER_NAME ": Invalid iomem size. Aborting.\n");
+ return -ENODEV;
+ }
+
+ mmc = mmc_alloc_host(sizeof(struct sdhci_host), &pdev->dev);
+ if (!mmc)
+ return -ENOMEM;
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+
+ host->bar = first_bar + slot;
+
+ host->addr = pci_resource_start(pdev, host->bar);
+ host->irq = pdev->irq;
+
+ DBG("slot %d at 0x%08lx, irq %d\n", slot, host->addr, host->irq);
+
+ snprintf(host->slot_descr, 20, "sdhci:slot%d", slot);
+
+ ret = pci_request_region(pdev, host->bar, host->slot_descr);
+ if (ret)
+ goto free;
+
+ host->ioaddr = ioremap_nocache(host->addr,
+ pci_resource_len(pdev, host->bar));
+ if (!host->ioaddr) {
+ ret = -ENOMEM;
+ goto release;
+ }
+
+ caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
+
+ if ((caps & SDHCI_CAN_DO_DMA) && ((pdev->class & 0x0000FF) == 0x01))
+ host->flags |= SDHCI_USE_DMA;
+
+ if (host->flags & SDHCI_USE_DMA) {
+ if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
+ printk(KERN_WARNING "%s: No suitable DMA available. "
+ "Falling back to PIO.\n", host->slot_descr);
+ host->flags &= ~SDHCI_USE_DMA;
+ }
+ }
+
+ if (host->flags & SDHCI_USE_DMA)
+ pci_set_master(pdev);
+ else /* XXX: Hack to get MMC layer to avoid highmem */
+ pdev->dma_mask = 0;
+
+ host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
+ host->max_clk *= 1000000;
+
+ /*
+ * Set host parameters.
+ */
+ mmc->ops = &sdhci_ops;
+ mmc->f_min = host->max_clk / 256;
+ mmc->f_max = host->max_clk;
+ mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+ mmc->caps = MMC_CAP_4_BIT_DATA;
+
+ spin_lock_init(&host->lock);
+
+ /*
+ * Maximum number of segments. Hardware cannot do scatter lists.
+ */
+ if (host->flags & SDHCI_USE_DMA)
+ mmc->max_hw_segs = 1;
+ else
+ mmc->max_hw_segs = 16;
+ mmc->max_phys_segs = 16;
+
+ /*
+ * Maximum number of sectors in one transfer. Limited by sector
+ * count register.
+ */
+ mmc->max_sectors = 0x3FFF;
+
+ /*
+ * Maximum segment size. Could be one segment with the maximum number
+ * of sectors.
+ */
+ mmc->max_seg_size = mmc->max_sectors * 512;
+
+ /*
+ * Init tasklets.
+ */
+ tasklet_init(&host->card_tasklet,
+ sdhci_tasklet_card, (unsigned long)host);
+ tasklet_init(&host->finish_tasklet,
+ sdhci_tasklet_finish, (unsigned long)host);
+
+ setup_timer(&host->timer, sdhci_timeout_timer, (int)host);
+
+ ret = request_irq(host->irq, sdhci_irq, SA_SHIRQ,
+ host->slot_descr, host);
+ if (ret)
+ goto unmap;
+
+ sdhci_init(host);
+
+#ifdef CONFIG_MMC_DEBUG
+ sdhci_dumpregs(host);
+#endif
+
+ host->chip = chip;
+ chip->hosts[slot] = host;
+
+ mmc_add_host(mmc);
+
+ printk(KERN_INFO "%s: SDHCI at 0x%08lx irq %d %s\n", mmc_hostname(mmc),
+ host->addr, host->irq,
+ (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
+
+ return 0;
+
+unmap:
+ tasklet_kill(&host->card_tasklet);
+ tasklet_kill(&host->finish_tasklet);
+
+ iounmap(host->ioaddr);
+release:
+ pci_release_region(pdev, host->bar);
+free:
+ mmc_free_host(mmc);
+
+ return ret;
+}
+
+static void sdhci_remove_slot(struct pci_dev *pdev, int slot)
+{
+ struct sdhci_chip *chip;
+ struct mmc_host *mmc;
+ struct sdhci_host *host;
+
+ chip = pci_get_drvdata(pdev);
+ host = chip->hosts[slot];
+ mmc = host->mmc;
+
+ chip->hosts[slot] = NULL;
+
+ mmc_remove_host(mmc);
+
+ sdhci_reset(host, SDHCI_RESET_ALL);
+
+ free_irq(host->irq, host);
+
+ del_timer_sync(&host->timer);
+
+ tasklet_kill(&host->card_tasklet);
+ tasklet_kill(&host->finish_tasklet);
+
+ iounmap(host->ioaddr);
+
+ pci_release_region(pdev, host->bar);
+
+ mmc_free_host(mmc);
+}
+
+static int __devinit sdhci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int ret, i;
+ u8 slots;
+ struct sdhci_chip *chip;
+
+ BUG_ON(pdev == NULL);
+ BUG_ON(ent == NULL);
+
+ DBG("found at %s\n", pci_name(pdev));
+
+ ret = pci_read_config_byte(pdev, PCI_SLOT_INFO, &slots);
+ if (ret)
+ return ret;
+
+ slots = PCI_SLOT_INFO_SLOTS(slots) + 1;
+ DBG("found %d slot(s)\n", slots);
+ if (slots == 0)
+ return -ENODEV;
+
+ ret = pci_enable_device(pdev);
+ if (ret)
+ return ret;
+
+ chip = kzalloc(sizeof(struct sdhci_chip) +
+ sizeof(struct sdhci_host*) * slots, GFP_KERNEL);
+ if (!chip) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ chip->pdev = pdev;
+
+ chip->num_slots = slots;
+ pci_set_drvdata(pdev, chip);
+
+ for (i = 0;i < slots;i++) {
+ ret = sdhci_probe_slot(pdev, i);
+ if (ret) {
+ for (i--;i >= 0;i--)
+ sdhci_remove_slot(pdev, i);
+ goto free;
+ }
+ }
+
+ return 0;
+
+free:
+ pci_set_drvdata(pdev, NULL);
+ kfree(chip);
+
+err:
+ pci_disable_device(pdev);
+ return ret;
+}
+
+static void __devexit sdhci_remove(struct pci_dev *pdev)
+{
+ int i;
+ struct sdhci_chip *chip;
+
+ chip = pci_get_drvdata(pdev);
+
+ if (chip) {
+ for (i = 0;i < chip->num_slots;i++)
+ sdhci_remove_slot(pdev, i);
+
+ pci_set_drvdata(pdev, NULL);
+
+ kfree(chip);
+ }
+
+ pci_disable_device(pdev);
+}
+
+static struct pci_driver sdhci_driver = {
+ .name = DRIVER_NAME,
+ .id_table = pci_ids,
+ .probe = sdhci_probe,
+ .remove = __devexit_p(sdhci_remove),
+ .suspend = sdhci_suspend,
+ .resume = sdhci_resume,
+};
+
+/*****************************************************************************\
+ * *
+ * Driver init/exit *
+ * *
+\*****************************************************************************/
+
+static int __init sdhci_drv_init(void)
+{
+ printk(KERN_INFO DRIVER_NAME
+ ": Secure Digital Host Controller Interface driver, "
+ DRIVER_VERSION "\n");
+ printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
+
+ return pci_register_driver(&sdhci_driver);
+}
+
+static void __exit sdhci_drv_exit(void)
+{
+ DBG("Exiting\n");
+
+ pci_unregister_driver(&sdhci_driver);
+}
+
+module_init(sdhci_drv_init);
+module_exit(sdhci_drv_exit);
+
+MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface driver");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff