*
* Driver for the MMC / SD / SDIO cell found in:
*
- * TC6393XB TC6391XB TC6387XB T7L66XB
+ * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
*
* This driver draws mainly on scattered spec sheets, Reverse engineering
* of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit
#include <linux/irq.h>
#include <linux/device.h>
#include <linux/delay.h>
+#include <linux/dmaengine.h>
#include <linux/mmc/host.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
clk |= 0x100;
}
- sd_config_write8(host, CNF_SD_CLK_MODE, clk >> 22);
+ if (host->set_clk_div)
+ host->set_clk_div(host->pdev, (clk>>22) & 1);
+
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff);
}
host->cmd = cmd;
-/* FIXME - this seems to be ok comented out but the spec suggest this bit should
- * be set when issuing app commands.
+/* FIXME - this seems to be ok commented out but the spec suggest this bit
+ * should be set when issuing app commands.
* if(cmd->flags & MMC_FLAG_ACMD)
* c |= APP_CMD;
*/
return 0;
}
-/* This chip always returns (at least?) as much data as you ask for.
+/*
+ * This chip always returns (at least?) as much data as you ask for.
* I'm unsure what happens if you ask for less than a block. This should be
* looked into to ensure that a funny length read doesnt hose the controller.
- *
*/
-static inline void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
+static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
{
struct mmc_data *data = host->data;
unsigned short *buf;
count = data->blksz;
pr_debug("count: %08x offset: %08x flags %08x\n",
- count, host->sg_off, data->flags);
+ count, host->sg_off, data->flags);
/* Transfer the data */
if (data->flags & MMC_DATA_READ)
return;
}
-static inline void tmio_mmc_data_irq(struct tmio_mmc_host *host)
+static void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
{
struct mmc_data *data = host->data;
struct mmc_command *stop;
host->data = NULL;
if (!data) {
- pr_debug("Spurious data end IRQ\n");
+ dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
return;
}
stop = data->stop;
pr_debug("Completed data request\n");
- /*FIXME - other drivers allow an optional stop command of any given type
+ /*
+ * FIXME: other drivers allow an optional stop command of any given type
* which we dont do, as the chip can auto generate them.
* Perhaps we can be smarter about when to use auto CMD12 and
* only issue the auto request when we know this is the desired
* upper layers expect. For now, we do what works.
*/
- if (data->flags & MMC_DATA_READ)
- disable_mmc_irqs(host, TMIO_MASK_READOP);
- else
- disable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+ if (data->flags & MMC_DATA_READ) {
+ if (!host->chan_rx)
+ disable_mmc_irqs(host, TMIO_MASK_READOP);
+ dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
+ host->mrq);
+ } else {
+ if (!host->chan_tx)
+ disable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+ dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
+ host->mrq);
+ }
if (stop) {
if (stop->opcode == 12 && !stop->arg)
tmio_mmc_finish_request(host);
}
-static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
+static void tmio_mmc_data_irq(struct tmio_mmc_host *host)
+{
+ struct mmc_data *data = host->data;
+
+ if (!data)
+ return;
+
+ if (host->chan_tx && (data->flags & MMC_DATA_WRITE)) {
+ /*
+ * Has all data been written out yet? Testing on SuperH showed,
+ * that in most cases the first interrupt comes already with the
+ * BUSY status bit clear, but on some operations, like mount or
+ * in the beginning of a write / sync / umount, there is one
+ * DATAEND interrupt with the BUSY bit set, in this cases
+ * waiting for one more interrupt fixes the problem.
+ */
+ if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) {
+ disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+ tasklet_schedule(&host->dma_complete);
+ }
+ } else if (host->chan_rx && (data->flags & MMC_DATA_READ)) {
+ disable_mmc_irqs(host, TMIO_STAT_DATAEND);
+ tasklet_schedule(&host->dma_complete);
+ } else {
+ tmio_mmc_do_data_irq(host);
+ }
+}
+
+static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host,
unsigned int stat)
{
struct mmc_command *cmd = host->cmd;
* If theres no data or we encountered an error, finish now.
*/
if (host->data && !cmd->error) {
- if (host->data->flags & MMC_DATA_READ)
- enable_mmc_irqs(host, TMIO_MASK_READOP);
- else
- enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+ if (host->data->flags & MMC_DATA_READ) {
+ if (!host->chan_rx)
+ enable_mmc_irqs(host, TMIO_MASK_READOP);
+ } else {
+ struct dma_chan *chan = host->chan_tx;
+ if (!chan)
+ enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
+ else
+ tasklet_schedule(&host->dma_issue);
+ }
} else {
tmio_mmc_finish_request(host);
}
return;
}
-
static irqreturn_t tmio_mmc_irq(int irq, void *devid)
{
struct tmio_mmc_host *host = devid;
if (!ireg) {
disable_mmc_irqs(host, status & ~irq_mask);
- pr_debug("tmio_mmc: Spurious irq, disabling! "
+ pr_warning("tmio_mmc: Spurious irq, disabling! "
"0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg);
pr_debug_status(status);
if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
TMIO_STAT_CARD_REMOVE);
- mmc_detect_change(host->mmc, 0);
+ mmc_detect_change(host->mmc, msecs_to_jiffies(100));
}
/* CRC and other errors */
return IRQ_HANDLED;
}
+#ifdef CONFIG_TMIO_MMC_DMA
+static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
+{
+#if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE)
+ /* Switch DMA mode on or off - SuperH specific? */
+ sd_ctrl_write16(host, 0xd8, enable ? 2 : 0);
+#endif
+}
+
+static void tmio_dma_complete(void *arg)
+{
+ struct tmio_mmc_host *host = arg;
+
+ dev_dbg(&host->pdev->dev, "Command completed\n");
+
+ if (!host->data)
+ dev_warn(&host->pdev->dev, "NULL data in DMA completion!\n");
+ else
+ enable_mmc_irqs(host, TMIO_STAT_DATAEND);
+}
+
+static int tmio_mmc_start_dma_rx(struct tmio_mmc_host *host)
+{
+ struct scatterlist *sg = host->sg_ptr;
+ struct dma_async_tx_descriptor *desc = NULL;
+ struct dma_chan *chan = host->chan_rx;
+ int ret;
+
+ ret = dma_map_sg(&host->pdev->dev, sg, host->sg_len, DMA_FROM_DEVICE);
+ if (ret > 0) {
+ host->dma_sglen = ret;
+ desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+ DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ }
+
+ if (desc) {
+ host->desc = desc;
+ desc->callback = tmio_dma_complete;
+ desc->callback_param = host;
+ host->cookie = desc->tx_submit(desc);
+ if (host->cookie < 0) {
+ host->desc = NULL;
+ ret = host->cookie;
+ } else {
+ chan->device->device_issue_pending(chan);
+ }
+ }
+ dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
+ __func__, host->sg_len, ret, host->cookie, host->mrq);
+
+ if (!host->desc) {
+ /* DMA failed, fall back to PIO */
+ if (ret >= 0)
+ ret = -EIO;
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ /* Free the Tx channel too */
+ chan = host->chan_tx;
+ if (chan) {
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ }
+ dev_warn(&host->pdev->dev,
+ "DMA failed: %d, falling back to PIO\n", ret);
+ tmio_mmc_enable_dma(host, false);
+ reset(host);
+ /* Fail this request, let above layers recover */
+ host->mrq->cmd->error = ret;
+ tmio_mmc_finish_request(host);
+ }
+
+ dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__,
+ desc, host->cookie, host->sg_len);
+
+ return ret > 0 ? 0 : ret;
+}
+
+static int tmio_mmc_start_dma_tx(struct tmio_mmc_host *host)
+{
+ struct scatterlist *sg = host->sg_ptr;
+ struct dma_async_tx_descriptor *desc = NULL;
+ struct dma_chan *chan = host->chan_tx;
+ int ret;
+
+ ret = dma_map_sg(&host->pdev->dev, sg, host->sg_len, DMA_TO_DEVICE);
+ if (ret > 0) {
+ host->dma_sglen = ret;
+ desc = chan->device->device_prep_slave_sg(chan, sg, ret,
+ DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ }
+
+ if (desc) {
+ host->desc = desc;
+ desc->callback = tmio_dma_complete;
+ desc->callback_param = host;
+ host->cookie = desc->tx_submit(desc);
+ if (host->cookie < 0) {
+ host->desc = NULL;
+ ret = host->cookie;
+ }
+ }
+ dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n",
+ __func__, host->sg_len, ret, host->cookie, host->mrq);
+
+ if (!host->desc) {
+ /* DMA failed, fall back to PIO */
+ if (ret >= 0)
+ ret = -EIO;
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ /* Free the Rx channel too */
+ chan = host->chan_rx;
+ if (chan) {
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ }
+ dev_warn(&host->pdev->dev,
+ "DMA failed: %d, falling back to PIO\n", ret);
+ tmio_mmc_enable_dma(host, false);
+ reset(host);
+ /* Fail this request, let above layers recover */
+ host->mrq->cmd->error = ret;
+ tmio_mmc_finish_request(host);
+ }
+
+ dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__,
+ desc, host->cookie);
+
+ return ret > 0 ? 0 : ret;
+}
+
+static int tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+ if (data->flags & MMC_DATA_READ) {
+ if (host->chan_rx)
+ return tmio_mmc_start_dma_rx(host);
+ } else {
+ if (host->chan_tx)
+ return tmio_mmc_start_dma_tx(host);
+ }
+
+ return 0;
+}
+
+static void tmio_issue_tasklet_fn(unsigned long priv)
+{
+ struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
+ struct dma_chan *chan = host->chan_tx;
+
+ chan->device->device_issue_pending(chan);
+}
+
+static void tmio_tasklet_fn(unsigned long arg)
+{
+ struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
+
+ if (host->data->flags & MMC_DATA_READ)
+ dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->dma_sglen,
+ DMA_FROM_DEVICE);
+ else
+ dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->dma_sglen,
+ DMA_TO_DEVICE);
+
+ tmio_mmc_do_data_irq(host);
+}
+
+/* It might be necessary to make filter MFD specific */
+static bool tmio_mmc_filter(struct dma_chan *chan, void *arg)
+{
+ dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
+ chan->private = arg;
+ return true;
+}
+
+static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
+{
+ host->cookie = -EINVAL;
+ host->desc = NULL;
+
+ /* We can only either use DMA for both Tx and Rx or not use it at all */
+ if (pdata->dma) {
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ host->chan_tx = dma_request_channel(mask, tmio_mmc_filter,
+ pdata->dma->chan_priv_tx);
+ dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
+ host->chan_tx);
+
+ if (!host->chan_tx)
+ return;
+
+ host->chan_rx = dma_request_channel(mask, tmio_mmc_filter,
+ pdata->dma->chan_priv_rx);
+ dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
+ host->chan_rx);
+
+ if (!host->chan_rx) {
+ dma_release_channel(host->chan_tx);
+ host->chan_tx = NULL;
+ return;
+ }
+
+ tasklet_init(&host->dma_complete, tmio_tasklet_fn, (unsigned long)host);
+ tasklet_init(&host->dma_issue, tmio_issue_tasklet_fn, (unsigned long)host);
+
+ tmio_mmc_enable_dma(host, true);
+ }
+}
+
+static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+ if (host->chan_tx) {
+ struct dma_chan *chan = host->chan_tx;
+ host->chan_tx = NULL;
+ dma_release_channel(chan);
+ }
+ if (host->chan_rx) {
+ struct dma_chan *chan = host->chan_rx;
+ host->chan_rx = NULL;
+ dma_release_channel(chan);
+ }
+
+ host->cookie = -EINVAL;
+ host->desc = NULL;
+}
+#else
+static int tmio_mmc_start_dma(struct tmio_mmc_host *host,
+ struct mmc_data *data)
+{
+ return 0;
+}
+
+static void tmio_mmc_request_dma(struct tmio_mmc_host *host,
+ struct tmio_mmc_data *pdata)
+{
+ host->chan_tx = NULL;
+ host->chan_rx = NULL;
+}
+
+static void tmio_mmc_release_dma(struct tmio_mmc_host *host)
+{
+}
+#endif
+
static int tmio_mmc_start_data(struct tmio_mmc_host *host,
struct mmc_data *data)
{
pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n",
- data->blksz, data->blocks);
+ data->blksz, data->blocks);
/* Hardware cannot perform 1 and 2 byte requests in 4 bit mode */
if (data->blksz < 4 && host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) {
- printk(KERN_ERR "%s: %d byte block unsupported in 4 bit mode\n",
- mmc_hostname(host->mmc), data->blksz);
+ pr_err("%s: %d byte block unsupported in 4 bit mode\n",
+ mmc_hostname(host->mmc), data->blksz);
return -EINVAL;
}
sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
- return 0;
+ return tmio_mmc_start_dma(host, data);
}
/* Process requests from the MMC layer */
}
ret = tmio_mmc_start_command(host, mrq->cmd);
-
if (!ret)
return;
/* Power sequence - OFF -> ON -> UP */
switch (ios->power_mode) {
case MMC_POWER_OFF: /* power down SD bus */
- sd_config_write8(host, CNF_PWR_CTL_2, 0x00);
+ if (host->set_pwr)
+ host->set_pwr(host->pdev, 0);
tmio_mmc_clk_stop(host);
break;
case MMC_POWER_ON: /* power up SD bus */
-
- sd_config_write8(host, CNF_PWR_CTL_2, 0x02);
+ if (host->set_pwr)
+ host->set_pwr(host->pdev, 1);
break;
case MMC_POWER_UP: /* start bus clock */
tmio_mmc_clk_start(host);
static int tmio_mmc_get_ro(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct mfd_cell *cell = host->pdev->dev.platform_data;
+ struct tmio_mmc_data *pdata = cell->driver_data;
- return (sd_ctrl_read16(host, CTL_STATUS) & TMIO_STAT_WRPROTECT) ? 0 : 1;
+ return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
+ (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)) ? 0 : 1;
}
-static struct mmc_host_ops tmio_mmc_ops = {
+static const struct mmc_host_ops tmio_mmc_ops = {
.request = tmio_mmc_request,
.set_ios = tmio_mmc_set_ios,
.get_ro = tmio_mmc_get_ro,
struct mmc_host *mmc = platform_get_drvdata(dev);
int ret;
- ret = mmc_suspend_host(mmc, state);
+ ret = mmc_suspend_host(mmc);
/* Tell MFD core it can disable us now.*/
if (!ret && cell->disable)
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct mmc_host *mmc = platform_get_drvdata(dev);
- struct tmio_mmc_host *host = mmc_priv(mmc);
int ret = 0;
/* Tell the MFD core we are ready to be enabled */
- if (cell->enable) {
- ret = cell->enable(dev);
+ if (cell->resume) {
+ ret = cell->resume(dev);
if (ret)
goto out;
}
- /* Enable the MMC/SD Control registers */
- sd_config_write16(host, CNF_CMD, SDCREN);
- sd_config_write32(host, CNF_CTL_BASE,
- (dev->resource[0].start >> host->bus_shift) & 0xfffe);
-
mmc_resume_host(mmc);
out:
{
struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct tmio_mmc_data *pdata;
- struct resource *res_ctl, *res_cnf;
+ struct resource *res_ctl;
struct tmio_mmc_host *host;
struct mmc_host *mmc;
int ret = -EINVAL;
+ u32 irq_mask = TMIO_MASK_CMD;
- if (dev->num_resources != 3)
+ if (dev->num_resources != 2)
goto out;
res_ctl = platform_get_resource(dev, IORESOURCE_MEM, 0);
- res_cnf = platform_get_resource(dev, IORESOURCE_MEM, 1);
- if (!res_ctl || !res_cnf)
+ if (!res_ctl)
goto out;
pdata = cell->driver_data;
host = mmc_priv(mmc);
host->mmc = mmc;
+ host->pdev = dev;
platform_set_drvdata(dev, mmc);
+ host->set_pwr = pdata->set_pwr;
+ host->set_clk_div = pdata->set_clk_div;
+
/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
host->bus_shift = resource_size(res_ctl) >> 10;
if (!host->ctl)
goto host_free;
- host->cnf = ioremap(res_cnf->start, resource_size(res_cnf));
- if (!host->cnf)
- goto unmap_ctl;
-
mmc->ops = &tmio_mmc_ops;
mmc->caps = MMC_CAP_4_BIT_DATA;
+ mmc->caps |= pdata->capabilities;
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
- mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ if (pdata->ocr_mask)
+ mmc->ocr_avail = pdata->ocr_mask;
+ else
+ mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
/* Tell the MFD core we are ready to be enabled */
if (cell->enable) {
ret = cell->enable(dev);
if (ret)
- goto unmap_cnf;
+ goto unmap_ctl;
}
- /* Enable the MMC/SD Control registers */
- sd_config_write16(host, CNF_CMD, SDCREN);
- sd_config_write32(host, CNF_CTL_BASE,
- (dev->resource[0].start >> host->bus_shift) & 0xfffe);
-
- /* Disable SD power during suspend */
- sd_config_write8(host, CNF_PWR_CTL_3, 0x01);
-
- /* The below is required but why? FIXME */
- sd_config_write8(host, CNF_STOP_CLK_CTL, 0x1f);
-
- /* Power down SD bus*/
- sd_config_write8(host, CNF_PWR_CTL_2, 0x00);
-
tmio_mmc_clk_stop(host);
reset(host);
if (ret >= 0)
host->irq = ret;
else
- goto unmap_cnf;
+ goto cell_disable;
disable_mmc_irqs(host, TMIO_MASK_ALL);
ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED |
- IRQF_TRIGGER_FALLING, "tmio-mmc", host);
+ IRQF_TRIGGER_FALLING, dev_name(&dev->dev), host);
if (ret)
- goto unmap_cnf;
+ goto cell_disable;
+
+ /* See if we also get DMA */
+ tmio_mmc_request_dma(host, pdata);
mmc_add_host(mmc);
- printk(KERN_INFO "%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
- (unsigned long)host->ctl, host->irq);
+ pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
+ (unsigned long)host->ctl, host->irq);
/* Unmask the IRQs we want to know about */
- enable_mmc_irqs(host, TMIO_MASK_IRQ);
+ if (!host->chan_rx)
+ irq_mask |= TMIO_MASK_READOP;
+ if (!host->chan_tx)
+ irq_mask |= TMIO_MASK_WRITEOP;
+ enable_mmc_irqs(host, irq_mask);
return 0;
-unmap_cnf:
- iounmap(host->cnf);
+cell_disable:
+ if (cell->disable)
+ cell->disable(dev);
unmap_ctl:
iounmap(host->ctl);
host_free:
static int __devexit tmio_mmc_remove(struct platform_device *dev)
{
+ struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
struct mmc_host *mmc = platform_get_drvdata(dev);
platform_set_drvdata(dev, NULL);
if (mmc) {
struct tmio_mmc_host *host = mmc_priv(mmc);
mmc_remove_host(mmc);
+ tmio_mmc_release_dma(host);
free_irq(host->irq, host);
+ if (cell->disable)
+ cell->disable(dev);
iounmap(host->ctl);
- iounmap(host->cnf);
mmc_free_host(mmc);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff