#endif /* CONFIG_MMC_DEBUG */
+/**
+ * s3cmci_host_usedma - return whether the host is using dma or pio
+ * @host: The host state
+ *
+ * Return true if the host is using DMA to transfer data, else false
+ * to use PIO mode. Will return static data depending on the driver
+ * configuration.
+ */
+static inline bool s3cmci_host_usedma(struct s3cmci_host *host)
+{
+#ifdef CONFIG_MMC_S3C_PIO
+ return false;
+#elif defined(CONFIG_MMC_S3C_DMA)
+ return true;
+#else
+ return host->dodma;
+#endif
+}
+
+/**
+ * s3cmci_host_canpio - return true if host has pio code available
+ *
+ * Return true if the driver has been compiled with the PIO support code
+ * available.
+ */
+static inline bool s3cmci_host_canpio(void)
+{
+#ifdef CONFIG_MMC_S3C_PIO
+ return true;
+#else
+ return false;
+#endif
+}
+
static inline u32 enable_imask(struct s3cmci_host *host, u32 imask)
{
u32 newmask;
static inline void clear_imask(struct s3cmci_host *host)
{
- writel(0, host->base + host->sdiimsk);
+ u32 mask = readl(host->base + host->sdiimsk);
+
+ /* preserve the SDIO IRQ mask state */
+ mask &= S3C2410_SDIIMSK_SDIOIRQ;
+ writel(mask, host->base + host->sdiimsk);
+}
+
+/**
+ * s3cmci_check_sdio_irq - test whether the SDIO IRQ is being signalled
+ * @host: The host to check.
+ *
+ * Test to see if the SDIO interrupt is being signalled in case the
+ * controller has failed to re-detect a card interrupt. Read GPE8 and
+ * see if it is low and if so, signal a SDIO interrupt.
+ *
+ * This is currently called if a request is finished (we assume that the
+ * bus is now idle) and when the SDIO IRQ is enabled in case the IRQ is
+ * already being indicated.
+*/
+static void s3cmci_check_sdio_irq(struct s3cmci_host *host)
+{
+ if (host->sdio_irqen) {
+ if (gpio_get_value(S3C2410_GPE(8)) == 0) {
+ printk(KERN_DEBUG "%s: signalling irq\n", __func__);
+ mmc_signal_sdio_irq(host->mmc);
+ }
+ }
}
static inline int get_data_buffer(struct s3cmci_host *host,
return 63 - fifostat;
}
+/**
+ * s3cmci_enable_irq - enable IRQ, after having disabled it.
+ * @host: The device state.
+ * @more: True if more IRQs are expected from transfer.
+ *
+ * Enable the main IRQ if needed after it has been disabled.
+ *
+ * The IRQ can be one of the following states:
+ * - disabled during IDLE
+ * - disabled whilst processing data
+ * - enabled during transfer
+ * - enabled whilst awaiting SDIO interrupt detection
+ */
+static void s3cmci_enable_irq(struct s3cmci_host *host, bool more)
+{
+ unsigned long flags;
+ bool enable = false;
+
+ local_irq_save(flags);
+
+ host->irq_enabled = more;
+ host->irq_disabled = false;
+
+ enable = more | host->sdio_irqen;
+
+ if (host->irq_state != enable) {
+ host->irq_state = enable;
+
+ if (enable)
+ enable_irq(host->irq);
+ else
+ disable_irq(host->irq);
+ }
+
+ local_irq_restore(flags);
+}
+
+/**
+ *
+ */
+static void s3cmci_disable_irq(struct s3cmci_host *host, bool transfer)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ //printk(KERN_DEBUG "%s: transfer %d\n", __func__, transfer);
+
+ host->irq_disabled = transfer;
+
+ if (transfer && host->irq_state) {
+ host->irq_state = false;
+ disable_irq(host->irq);
+ }
+
+ local_irq_restore(flags);
+}
+
static void do_pio_read(struct s3cmci_host *host)
{
int res;
{
struct s3cmci_host *host = (struct s3cmci_host *) data;
-
- disable_irq(host->irq);
+ s3cmci_disable_irq(host, true);
if (host->pio_active == XFER_WRITE)
do_pio_write(host);
host->mrq->data->error = -EINVAL;
}
+ s3cmci_enable_irq(host, false);
finalize_request(host);
} else
- enable_irq(host->irq);
+ s3cmci_enable_irq(host, true);
}
/*
struct s3cmci_host *host = dev_id;
struct mmc_command *cmd;
u32 mci_csta, mci_dsta, mci_fsta, mci_dcnt, mci_imsk;
- u32 mci_cclear, mci_dclear;
+ u32 mci_cclear = 0, mci_dclear;
unsigned long iflags;
+ mci_dsta = readl(host->base + S3C2410_SDIDSTA);
+ mci_imsk = readl(host->base + host->sdiimsk);
+
+ if (mci_dsta & S3C2410_SDIDSTA_SDIOIRQDETECT) {
+ if (mci_imsk & S3C2410_SDIIMSK_SDIOIRQ) {
+ mci_dclear = S3C2410_SDIDSTA_SDIOIRQDETECT;
+ writel(mci_dclear, host->base + S3C2410_SDIDSTA);
+
+ mmc_signal_sdio_irq(host->mmc);
+ return IRQ_HANDLED;
+ }
+ }
+
spin_lock_irqsave(&host->complete_lock, iflags);
mci_csta = readl(host->base + S3C2410_SDICMDSTAT);
- mci_dsta = readl(host->base + S3C2410_SDIDSTA);
mci_dcnt = readl(host->base + S3C2410_SDIDCNT);
mci_fsta = readl(host->base + S3C2410_SDIFSTA);
- mci_imsk = readl(host->base + host->sdiimsk);
- mci_cclear = 0;
mci_dclear = 0;
if ((host->complete_what == COMPLETION_NONE) ||
goto irq_out;
}
- if (!host->dodma) {
+ if (!s3cmci_host_usedma(host)) {
if ((host->pio_active == XFER_WRITE) &&
(mci_fsta & S3C2410_SDIFSTA_TFDET)) {
dbg(host, dbg_dma, "DMA FINISHED Size:%i DSTA:%08x DCNT:%08x\n",
size, mci_dsta, mci_dcnt);
+ host->dma_complete = 1;
host->complete_what = COMPLETION_FINALIZE;
out:
if (cmd->data && (cmd->error == 0) &&
(cmd->data->error == 0)) {
- if (host->dodma && (!host->dma_complete)) {
- dbg(host, dbg_dma, "DMA Missing!\n");
+ if (s3cmci_host_usedma(host) && (!host->dma_complete)) {
+ dbg(host, dbg_dma, "DMA Missing (%d)!\n",
+ host->dma_complete);
return;
}
}
/* If we had an error while transfering data we flush the
* DMA channel and the fifo to clear out any garbage. */
if (mrq->data->error != 0) {
- if (host->dodma)
+ if (s3cmci_host_usedma(host))
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
if (host->is2440) {
request_done:
host->complete_what = COMPLETION_NONE;
host->mrq = NULL;
+
+ s3cmci_check_sdio_irq(host);
mmc_request_done(host->mmc, mrq);
}
dcon = data->blocks & S3C2410_SDIDCON_BLKNUM_MASK;
- if (host->dodma)
+ if (s3cmci_host_usedma(host))
dcon |= S3C2410_SDIDCON_DMAEN;
if (host->bus_width == MMC_BUS_WIDTH_4)
static int s3cmci_prepare_dma(struct s3cmci_host *host, struct mmc_data *data)
{
int dma_len, i;
- int rw = (data->flags & MMC_DATA_WRITE) ? 1 : 0;
+ int rw = data->flags & MMC_DATA_WRITE;
BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
s3c2410_dma_ctrl(host->dma, S3C2410_DMAOP_FLUSH);
dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
- (rw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ rw ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (dma_len == 0)
return -ENOMEM;
for (i = 0; i < dma_len; i++) {
int res;
- dbg(host, dbg_dma, "enqueue %i:%u@%u\n", i,
- sg_dma_address(&data->sg[i]),
- sg_dma_len(&data->sg[i]));
+ dbg(host, dbg_dma, "enqueue %i: %08x@%u\n", i,
+ sg_dma_address(&data->sg[i]),
+ sg_dma_len(&data->sg[i]));
- res = s3c2410_dma_enqueue(host->dma, (void *) host,
+ res = s3c2410_dma_enqueue(host->dma, host,
sg_dma_address(&data->sg[i]),
sg_dma_len(&data->sg[i]));
return;
}
- if (host->dodma)
+ if (s3cmci_host_usedma(host))
res = s3cmci_prepare_dma(host, cmd->data);
else
res = s3cmci_prepare_pio(host, cmd->data);
s3cmci_send_command(host, cmd);
/* Enable Interrupt */
- enable_irq(host->irq);
+ s3cmci_enable_irq(host, true);
}
static int s3cmci_card_present(struct mmc_host *mmc)
struct s3c24xx_mci_pdata *pdata = host->pdata;
int ret;
- if (pdata->gpio_wprotect == 0)
+ if (pdata->no_wprotect)
return 0;
ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
return ret;
}
+static void s3cmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct s3cmci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+ u32 con;
+
+ local_irq_save(flags);
+
+ con = readl(host->base + S3C2410_SDICON);
+ host->sdio_irqen = enable;
+
+ if (enable == host->sdio_irqen)
+ goto same_state;
+
+ if (enable) {
+ con |= S3C2410_SDICON_SDIOIRQ;
+ enable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
+
+ if (!host->irq_state && !host->irq_disabled) {
+ host->irq_state = true;
+ enable_irq(host->irq);
+ }
+ } else {
+ disable_imask(host, S3C2410_SDIIMSK_SDIOIRQ);
+ con &= ~S3C2410_SDICON_SDIOIRQ;
+
+ if (!host->irq_enabled && host->irq_state) {
+ disable_irq_nosync(host->irq);
+ host->irq_state = false;
+ }
+ }
+
+ writel(con, host->base + S3C2410_SDICON);
+
+ same_state:
+ local_irq_restore(flags);
+
+ s3cmci_check_sdio_irq(host);
+}
+
static struct mmc_host_ops s3cmci_ops = {
.request = s3cmci_request,
.set_ios = s3cmci_set_ios,
.get_ro = s3cmci_get_ro,
.get_cd = s3cmci_card_present,
+ .enable_sdio_irq = s3cmci_enable_sdio_irq,
};
static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
seq_printf(seq, "Prescale = %d\n", host->prescaler);
seq_printf(seq, "is2440 = %d\n", host->is2440);
seq_printf(seq, "IRQ = %d\n", host->irq);
+ seq_printf(seq, "IRQ enabled = %d\n", host->irq_enabled);
+ seq_printf(seq, "IRQ disabled = %d\n", host->irq_disabled);
+ seq_printf(seq, "IRQ state = %d\n", host->irq_state);
seq_printf(seq, "CD IRQ = %d\n", host->irq_cd);
- seq_printf(seq, "Do DMA = %d\n", host->dodma);
+ seq_printf(seq, "Do DMA = %d\n", s3cmci_host_usedma(host));
seq_printf(seq, "SDIIMSK at %d\n", host->sdiimsk);
seq_printf(seq, "SDIDATA at %d\n", host->sdidata);
host->clk_div = 2;
}
- host->dodma = 0;
host->complete_what = COMPLETION_NONE;
host->pio_active = XFER_NONE;
- host->dma = S3CMCI_DMA;
+#ifdef CONFIG_MMC_S3C_PIODMA
+ host->dodma = host->pdata->dma;
+#endif
host->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!host->mem) {
* ensure we don't lock the system with un-serviceable requests. */
disable_irq(host->irq);
+ host->irq_state = false;
- if (host->pdata->gpio_detect) {
+ if (!host->pdata->no_detect) {
ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
if (ret) {
dev_err(&pdev->dev, "failed to get detect gpio\n");
goto probe_free_irq;
}
- }
-
- host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
- if (host->irq_cd >= 0) {
- if (request_irq(host->irq_cd, s3cmci_irq_cd,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
- DRIVER_NAME, host)) {
- dev_err(&pdev->dev, "can't get card detect irq.\n");
- ret = -ENOENT;
- goto probe_free_gpio_cd;
+ host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
+
+ if (host->irq_cd >= 0) {
+ if (request_irq(host->irq_cd, s3cmci_irq_cd,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ DRIVER_NAME, host)) {
+ dev_err(&pdev->dev,
+ "can't get card detect irq.\n");
+ ret = -ENOENT;
+ goto probe_free_gpio_cd;
+ }
+ } else {
+ dev_warn(&pdev->dev,
+ "host detect has no irq available\n");
+ gpio_direction_input(host->pdata->gpio_detect);
}
- } else {
- dev_warn(&pdev->dev, "host detect has no irq available\n");
- gpio_direction_input(host->pdata->gpio_detect);
- }
+ } else
+ host->irq_cd = -1;
- if (host->pdata->gpio_wprotect) {
+ if (!host->pdata->no_wprotect) {
ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
if (ret) {
dev_err(&pdev->dev, "failed to get writeprotect\n");
gpio_direction_input(host->pdata->gpio_wprotect);
}
- if (s3c2410_dma_request(S3CMCI_DMA, &s3cmci_dma_client, NULL) < 0) {
- dev_err(&pdev->dev, "unable to get DMA channel.\n");
- ret = -EBUSY;
- goto probe_free_gpio_wp;
+ /* depending on the dma state, get a dma channel to use. */
+
+ if (s3cmci_host_usedma(host)) {
+ host->dma = s3c2410_dma_request(DMACH_SDI, &s3cmci_dma_client,
+ host);
+ if (host->dma < 0) {
+ dev_err(&pdev->dev, "cannot get DMA channel.\n");
+ if (!s3cmci_host_canpio()) {
+ ret = -EBUSY;
+ goto probe_free_gpio_wp;
+ } else {
+ dev_warn(&pdev->dev, "falling back to PIO.\n");
+ host->dodma = 0;
+ }
+ }
}
host->clk = clk_get(&pdev->dev, "sdi");
dev_err(&pdev->dev, "failed to find clock source.\n");
ret = PTR_ERR(host->clk);
host->clk = NULL;
- goto probe_free_host;
+ goto probe_free_dma;
}
ret = clk_enable(host->clk);
mmc->ops = &s3cmci_ops;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+#ifdef CONFIG_MMC_S3C_HW_SDIO_IRQ
+ mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
+#else
mmc->caps = MMC_CAP_4_BIT_DATA;
+#endif
mmc->f_min = host->clk_rate / (host->clk_div * 256);
mmc->f_max = host->clk_rate / host->clk_div;
s3cmci_debugfs_attach(host);
platform_set_drvdata(pdev, mmc);
- dev_info(&pdev->dev, "initialisation done.\n");
+ dev_info(&pdev->dev, "%s - using %s, %s SDIO IRQ\n", mmc_hostname(mmc),
+ s3cmci_host_usedma(host) ? "dma" : "pio",
+ mmc->caps & MMC_CAP_SDIO_IRQ ? "hw" : "sw");
return 0;
clk_free:
clk_put(host->clk);
+ probe_free_dma:
+ if (s3cmci_host_usedma(host))
+ s3c2410_dma_free(host->dma, &s3cmci_dma_client);
+
probe_free_gpio_wp:
- if (host->pdata->gpio_wprotect)
+ if (!host->pdata->no_wprotect)
gpio_free(host->pdata->gpio_wprotect);
probe_free_gpio_cd:
- if (host->pdata->gpio_detect)
+ if (!host->pdata->no_detect)
gpio_free(host->pdata->gpio_detect);
probe_free_irq_cd:
clk_put(host->clk);
tasklet_disable(&host->pio_tasklet);
- s3c2410_dma_free(S3CMCI_DMA, &s3cmci_dma_client);
+
+ if (s3cmci_host_usedma(host))
+ s3c2410_dma_free(host->dma, &s3cmci_dma_client);
free_irq(host->irq, host);
- if (pd->gpio_wprotect)
+ if (!pd->no_wprotect)
gpio_free(pd->gpio_wprotect);
- if (pd->gpio_detect)
+ if (!pd->no_detect)
gpio_free(pd->gpio_detect);
for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)
projects / mv-sheeva.git / blobdiff