[PATCH 4/4] MMC: atmel-mci: Add support for SDIO interrupts

Nicolas Ferre
2010-04-27T13:22:35Z

From: Anders Grahn <anders.grahn@hd-wireless.se>

Atmel-mci support for SDIO interrupts. This adds the enable_sdio_irq() function
and the configuration of sdio irq mask per slot. With this irq mask
information, we keep the idea of multiple slot per sd/mmc host (not only
A and B).
MMC_CAP_SDIO_IRQ is added according to slot configuration.

A new little function is added to run mmc_signal_sdio_irq() during interrupt
handling routine.

Signed-off-by: Anders Grahn <anders.grahn@hd-wireless.se>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
drivers/mmc/host/atmel-mci.c | 42 ++++++++++++++++++++++++++++++++++++++----
1 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 68b47cc..fd96ab9 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -173,6 +173,7 @@ struct atmel_mci {
* @mmc: The mmc_host representing this slot.
* @host: The MMC controller this slot is using.
* @sdc_reg: Value of SDCR to be written before using this slot.
+ * @sdio_irq: SDIO irq mask 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
@@ -191,6 +192,7 @@ struct atmel_mci_slot {
struct atmel_mci *host;

u32 sdc_reg;
+ u32 sdio_irq;

struct mmc_request *mrq;
struct list_head queue_node;
@@ -792,7 +794,7 @@ static void atmci_start_request(struct atmel_mci *host,
mci_writel(host, SDCR, slot->sdc_reg);

iflags = mci_readl(host, IMR);
- if (iflags)
+ if (iflags & ~(MCI_SDIOIRQA | MCI_SDIOIRQB))
dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
iflags);

@@ -1041,11 +1043,23 @@ static int atmci_get_cd(struct mmc_host *mmc)
return present;
}

+static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+ struct atmel_mci_slot *slot = mmc_priv(mmc);
+ struct atmel_mci *host = slot->host;
+
+ if (enable)
+ mci_writel(host, IER, slot->sdio_irq);
+ else
+ mci_writel(host, IDR, slot->sdio_irq);
+}
+
static const struct mmc_host_ops atmci_ops = {
.request = atmci_request,
.set_ios = atmci_set_ios,
.get_ro = atmci_get_ro,
.get_cd = atmci_get_cd,
+ .enable_sdio_irq = atmci_enable_sdio_irq,
};

/* Called with host->lock held */
@@ -1497,6 +1511,19 @@ static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status)
tasklet_schedule(&host->tasklet);
}

+static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
+{
+ int i;
+
+ for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+ struct atmel_mci_slot *slot = host->slot[i];
+ if (slot && (status & slot->sdio_irq)) {
+ mmc_signal_sdio_irq(slot->mmc);
+ }
+ }
+}
+
+
static irqreturn_t atmci_interrupt(int irq, void *dev_id)
{
struct atmel_mci *host = dev_id;
@@ -1536,6 +1563,10 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)

if (pending & MCI_CMDRDY)
atmci_cmd_interrupt(host, status);
+
+ if (pending & (MCI_SDIOIRQA | MCI_SDIOIRQB))
+ atmci_sdio_interrupt(host, status);
+
} while (pass_count++ < 5);

return pass_count ? IRQ_HANDLED : IRQ_NONE;
@@ -1558,7 +1589,7 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)

static int __init atmci_init_slot(struct atmel_mci *host,
struct mci_slot_pdata *slot_data, unsigned int id,
- u32 sdc_reg)
+ u32 sdc_reg, u32 sdio_irq)
{
struct mmc_host *mmc;
struct atmel_mci_slot *slot;
@@ -1574,11 +1605,14 @@ static int __init atmci_init_slot(struct atmel_mci *host,
slot->wp_pin = slot_data->wp_pin;
slot->detect_is_active_high = slot_data->detect_is_active_high;
slot->sdc_reg = sdc_reg;
+ slot->sdio_irq = sdio_irq;

mmc->ops = &atmci_ops;
mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
mmc->f_max = host->bus_hz / 2;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
+ if (sdio_irq)
+ mmc->caps |= MMC_CAP_SDIO_IRQ;
if (atmci_is_mci2())
mmc->caps |= MMC_CAP_SD_HIGHSPEED;
if (slot_data->bus_width >= 4)
@@ -1769,13 +1803,13 @@ static int __init atmci_probe(struct platform_device *pdev)
ret = -ENODEV;
if (pdata->slot[0].bus_width) {
ret = atmci_init_slot(host, &pdata->slot[0],
- 0, MCI_SDCSEL_SLOT_A);
+ 0, MCI_SDCSEL_SLOT_A, MCI_SDIOIRQA);
if (!ret)
nr_slots++;
}
if (pdata->slot[1].bus_width) {
ret = atmci_init_slot(host, &pdata->slot[1],
- 1, MCI_SDCSEL_SLOT_B);
+ 1, MCI_SDCSEL_SLOT_B, MCI_SDIOIRQB);
if (!ret)
nr_slots++;
}
--
1.5.6.5