/*
- * linux/drivers/mmc/mmci.c - ARM PrimeCell MMCI PL180/1 driver
+ * linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
*
* Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
*
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/highmem.h>
+#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
+#include <linux/scatterlist.h>
+#include <linux/gpio.h>
+#include <linux/amba/mmci.h>
#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/io.h>
-#include <asm/scatterlist.h>
#include <asm/sizes.h>
-#include <asm/mach/mmc.h>
#include "mmci.h"
static unsigned int fmax = 515633;
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
+{
+ u32 clk = 0;
+
+ if (desired) {
+ if (desired >= host->mclk) {
+ clk = MCI_CLK_BYPASS;
+ host->cclk = host->mclk;
+ } else {
+ clk = host->mclk / (2 * desired) - 1;
+ if (clk >= 256)
+ clk = 255;
+ host->cclk = host->mclk / (2 * (clk + 1));
+ }
+ if (host->hw_designer == 0x80)
+ clk |= MCI_FCEN; /* Bug fix in ST IP block */
+ clk |= MCI_CLK_ENABLE;
+ /* This hasn't proven to be worthwhile */
+ /* clk |= MCI_CLK_PWRSAVE; */
+ }
+
+ if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
+ clk |= MCI_WIDE_BUS;
+
+ writel(clk, host->base + MMCICLOCK);
+}
+
static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
}
if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
if (status & MCI_DATACRCFAIL)
- data->error = MMC_ERR_BADCRC;
+ data->error = -EILSEQ;
else if (status & MCI_DATATIMEOUT)
- data->error = MMC_ERR_TIMEOUT;
+ data->error = -ETIMEDOUT;
else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
- data->error = MMC_ERR_FIFO;
+ data->error = -EIO;
status |= MCI_DATAEND;
/*
* partially written to a page is properly coherent.
*/
if (host->sg_len && data->flags & MMC_DATA_READ)
- flush_dcache_page(host->sg_ptr->page);
+ flush_dcache_page(sg_page(host->sg_ptr));
}
if (status & MCI_DATAEND) {
mmci_stop_data(host);
cmd->resp[3] = readl(base + MMCIRESPONSE3);
if (status & MCI_CMDTIMEOUT) {
- cmd->error = MMC_ERR_TIMEOUT;
+ cmd->error = -ETIMEDOUT;
} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
- cmd->error = MMC_ERR_BADCRC;
+ cmd->error = -EILSEQ;
}
- if (!cmd->data || cmd->error != MMC_ERR_NONE) {
+ if (!cmd->data || cmd->error) {
if (host->data)
mmci_stop_data(host);
mmci_request_end(host, cmd->mrq);
void __iomem *base = host->base;
char *ptr = buffer;
u32 status;
+ int host_remain = host->size;
do {
- int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
+ int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);
if (count > remain)
count = remain;
ptr += count;
remain -= count;
+ host_remain -= count;
if (remain == 0)
break;
* page, ensure that the data cache is coherent.
*/
if (status & MCI_RXACTIVE)
- flush_dcache_page(host->sg_ptr->page);
+ flush_dcache_page(sg_page(host->sg_ptr));
if (!mmci_next_sg(host))
break;
static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
WARN_ON(host->mrq != NULL);
- spin_lock_irq(&host->lock);
+ if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
+ printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
+ mmc_hostname(mmc), mrq->data->blksz);
+ mrq->cmd->error = -EINVAL;
+ mmc_request_done(mmc, mrq);
+ return;
+ }
+
+ spin_lock_irqsave(&host->lock, flags);
host->mrq = mrq;
mmci_start_command(host, mrq->cmd, 0);
- spin_unlock_irq(&host->lock);
+ spin_unlock_irqrestore(&host->lock, flags);
}
static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmci_host *host = mmc_priv(mmc);
- u32 clk = 0, pwr = 0;
-
- if (ios->clock) {
- if (ios->clock >= host->mclk) {
- clk = MCI_CLK_BYPASS;
- host->cclk = host->mclk;
- } else {
- clk = host->mclk / (2 * ios->clock) - 1;
- if (clk > 256)
- clk = 255;
- host->cclk = host->mclk / (2 * (clk + 1));
- }
- clk |= MCI_CLK_ENABLE;
- }
+ u32 pwr = 0;
+ unsigned long flags;
if (host->plat->translate_vdd)
pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
case MMC_POWER_OFF:
break;
case MMC_POWER_UP:
- pwr |= MCI_PWR_UP;
- break;
+ /* The ST version does not have this, fall through to POWER_ON */
+ if (host->hw_designer != AMBA_VENDOR_ST) {
+ pwr |= MCI_PWR_UP;
+ break;
+ }
case MMC_POWER_ON:
pwr |= MCI_PWR_ON;
break;
}
- if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
- pwr |= MCI_ROD;
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
+ if (host->hw_designer != AMBA_VENDOR_ST)
+ pwr |= MCI_ROD;
+ else {
+ /*
+ * The ST Micro variant use the ROD bit for something
+ * else and only has OD (Open Drain).
+ */
+ pwr |= MCI_OD;
+ }
+ }
- writel(clk, host->base + MMCICLOCK);
+ spin_lock_irqsave(&host->lock, flags);
+
+ mmci_set_clkreg(host, ios->clock);
if (host->pwr != pwr) {
host->pwr = pwr;
writel(pwr, host->base + MMCIPOWER);
}
+
+ spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_get_ro(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+
+ if (host->gpio_wp == -ENOSYS)
+ return -ENOSYS;
+
+ return gpio_get_value(host->gpio_wp);
+}
+
+static int mmci_get_cd(struct mmc_host *mmc)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ unsigned int status;
+
+ if (host->gpio_cd == -ENOSYS)
+ status = host->plat->status(mmc_dev(host->mmc));
+ else
+ status = gpio_get_value(host->gpio_cd);
+
+ return !status;
}
static const struct mmc_host_ops mmci_ops = {
.request = mmci_request,
.set_ios = mmci_set_ios,
+ .get_ro = mmci_get_ro,
+ .get_cd = mmci_get_cd,
};
static void mmci_check_status(unsigned long data)
{
struct mmci_host *host = (struct mmci_host *)data;
- unsigned int status;
+ unsigned int status = mmci_get_cd(host->mmc);
- status = host->plat->status(mmc_dev(host->mmc));
if (status ^ host->oldstat)
mmc_detect_change(host->mmc, 0);
mod_timer(&host->timer, jiffies + HZ);
}
-static int mmci_probe(struct amba_device *dev, void *id)
+static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
{
- struct mmc_platform_data *plat = dev->dev.platform_data;
+ struct mmci_platform_data *plat = dev->dev.platform_data;
struct mmci_host *host;
struct mmc_host *mmc;
int ret;
}
host = mmc_priv(mmc);
- host->clk = clk_get(&dev->dev, "MCLK");
+ host->mmc = mmc;
+
+ host->gpio_wp = -ENOSYS;
+ host->gpio_cd = -ENOSYS;
+
+ host->hw_designer = amba_manf(dev);
+ host->hw_revision = amba_rev(dev);
+ DBG(host, "designer ID = 0x%02x\n", host->hw_designer);
+ DBG(host, "revision = 0x%01x\n", host->hw_revision);
+
+ host->clk = clk_get(&dev->dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
host->clk = NULL;
host->plat = plat;
host->mclk = clk_get_rate(host->clk);
- host->mmc = mmc;
- host->base = ioremap(dev->res.start, SZ_4K);
+ /*
+ * According to the spec, mclk is max 100 MHz,
+ * so we try to adjust the clock down to this,
+ * (if possible).
+ */
+ if (host->mclk > 100000000) {
+ ret = clk_set_rate(host->clk, 100000000);
+ if (ret < 0)
+ goto clk_disable;
+ host->mclk = clk_get_rate(host->clk);
+ DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
+ }
+ host->base = ioremap(dev->res.start, resource_size(&dev->res));
if (!host->base) {
ret = -ENOMEM;
goto clk_disable;
mmc->f_min = (host->mclk + 511) / 512;
mmc->f_max = min(host->mclk, fmax);
mmc->ocr_avail = plat->ocr_mask;
- mmc->caps = MMC_CAP_MULTIWRITE;
+ mmc->caps = plat->capabilities;
/*
* We can do SGIO
writel(0, host->base + MMCIMASK1);
writel(0xfff, host->base + MMCICLEAR);
+#ifdef CONFIG_GPIOLIB
+ if (gpio_is_valid(plat->gpio_cd)) {
+ ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)");
+ if (ret == 0)
+ ret = gpio_direction_input(plat->gpio_cd);
+ if (ret == 0)
+ host->gpio_cd = plat->gpio_cd;
+ else if (ret != -ENOSYS)
+ goto err_gpio_cd;
+ }
+ if (gpio_is_valid(plat->gpio_wp)) {
+ ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)");
+ if (ret == 0)
+ ret = gpio_direction_input(plat->gpio_wp);
+ if (ret == 0)
+ host->gpio_wp = plat->gpio_wp;
+ else if (ret != -ENOSYS)
+ goto err_gpio_wp;
+ }
+#endif
+
ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
if (ret)
goto unmap;
writel(MCI_IRQENABLE, host->base + MMCIMASK0);
amba_set_drvdata(dev, mmc);
+ host->oldstat = mmci_get_cd(host->mmc);
mmc_add_host(mmc);
irq0_free:
free_irq(dev->irq[0], host);
unmap:
+ if (host->gpio_wp != -ENOSYS)
+ gpio_free(host->gpio_wp);
+ err_gpio_wp:
+ if (host->gpio_cd != -ENOSYS)
+ gpio_free(host->gpio_cd);
+ err_gpio_cd:
iounmap(host->base);
clk_disable:
clk_disable(host->clk);
return ret;
}
-static int mmci_remove(struct amba_device *dev)
+static int __devexit mmci_remove(struct amba_device *dev)
{
struct mmc_host *mmc = amba_get_drvdata(dev);
free_irq(dev->irq[0], host);
free_irq(dev->irq[1], host);
+ if (host->gpio_wp != -ENOSYS)
+ gpio_free(host->gpio_wp);
+ if (host->gpio_cd != -ENOSYS)
+ gpio_free(host->gpio_cd);
+
iounmap(host->base);
clk_disable(host->clk);
clk_put(host->clk);
.id = 0x00041181,
.mask = 0x000fffff,
},
+ /* ST Micro variants */
+ {
+ .id = 0x00180180,
+ .mask = 0x00ffffff,
+ },
+ {
+ .id = 0x00280180,
+ .mask = 0x00ffffff,
+ },
{ 0, 0 },
};
.name = DRIVER_NAME,
},
.probe = mmci_probe,
- .remove = mmci_remove,
+ .remove = __devexit_p(mmci_remove),
.suspend = mmci_suspend,
.resume = mmci_resume,
.id_table = mmci_ids,
Code Review / linux-2.6.git / blobdiff