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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-08-07 14:08:49 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-05 20:39:21 +0200
commit6b918657b7431e4c5c953b8222ae2f4fc1b2576a (patch)
treebb3bb53d91501064821ea860a490dc1b3633df52 /drivers/mmc
parent945533b538c6c6185afc77ba4a81eeba8f6ef8dd (diff)
downloadop-kernel-dev-6b918657b7431e4c5c953b8222ae2f4fc1b2576a.zip
op-kernel-dev-6b918657b7431e4c5c953b8222ae2f4fc1b2576a.tar.gz
atmel-mci: Platform code for supporting multiple mmc slots
Add the necessary platform infrastructure to support multiple mmc/sdcard slots all at once through a single controller. Currently, the driver will use the first valid slot it finds and stick with that, but later patches will add support for switching between several slots on the fly. Extend the platform data structure with per-slot information: MMC/SDcard bus width and card detect/write protect pins. This will affect the pin muxing as well as the capabilities announced to the mmc core. Note that board code is now required to supply a mci_platform_data struct to at32_add_device_mci(). Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/atmel-mci-regs.h6
-rw-r--r--drivers/mmc/host/atmel-mci.c24
2 files changed, 24 insertions, 6 deletions
diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index 26bd80e..b58364e 100644
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -25,8 +25,10 @@
#define MCI_SDCR 0x000c /* SD Card / SDIO */
# define MCI_SDCSEL_SLOT_A ( 0 << 0) /* Select SD slot A */
# define MCI_SDCSEL_SLOT_B ( 1 << 0) /* Select SD slot A */
-# define MCI_SDCBUS_1BIT ( 0 << 7) /* 1-bit data bus */
-# define MCI_SDCBUS_4BIT ( 1 << 7) /* 4-bit data bus */
+# define MCI_SDCSEL_MASK ( 3 << 0)
+# define MCI_SDCBUS_1BIT ( 0 << 6) /* 1-bit data bus */
+# define MCI_SDCBUS_4BIT ( 2 << 6) /* 4-bit data bus */
+# define MCI_SDCBUS_MASK ( 3 << 6)
#define MCI_ARGR 0x0010 /* Command Argument */
#define MCI_CMDR 0x0014 /* Command */
# define MCI_CMDR_CMDNB(x) ((x) << 0) /* Command Opcode */
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 14ab28d..8170905 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -508,9 +508,10 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct atmel_mci *host = mmc_priv(mmc);
+ host->sdc_reg &= ~MCI_SDCBUS_MASK;
switch (ios->bus_width) {
case MMC_BUS_WIDTH_1:
- host->sdc_reg = 0;
+ host->sdc_reg |= MCI_SDCBUS_1BIT;
break;
case MMC_BUS_WIDTH_4:
host->sdc_reg = MCI_SDCBUS_4BIT;
@@ -1014,9 +1015,11 @@ static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
static int __init atmci_probe(struct platform_device *pdev)
{
struct mci_platform_data *pdata;
+ struct mci_slot_pdata *slot;
struct atmel_mci *host;
struct mmc_host *mmc;
struct resource *regs;
+ u32 sdc_reg;
int irq;
int ret;
@@ -1030,6 +1033,17 @@ static int __init atmci_probe(struct platform_device *pdev)
if (irq < 0)
return irq;
+ /* TODO: Allow using several slots at once */
+ if (pdata->slot[0].bus_width) {
+ sdc_reg = MCI_SDCSEL_SLOT_A;
+ slot = &pdata->slot[0];
+ } else if (pdata->slot[1].bus_width) {
+ sdc_reg = MCI_SDCSEL_SLOT_B;
+ slot = &pdata->slot[1];
+ } else {
+ return -EINVAL;
+ }
+
mmc = mmc_alloc_host(sizeof(struct atmel_mci), &pdev->dev);
if (!mmc)
return -ENOMEM;
@@ -1037,8 +1051,9 @@ static int __init atmci_probe(struct platform_device *pdev)
host = mmc_priv(mmc);
host->pdev = pdev;
host->mmc = mmc;
- host->detect_pin = pdata->detect_pin;
- host->wp_pin = pdata->wp_pin;
+ host->detect_pin = slot->detect_pin;
+ host->wp_pin = slot->wp_pin;
+ host->sdc_reg = sdc_reg;
host->mck = clk_get(&pdev->dev, "mci_clk");
if (IS_ERR(host->mck)) {
@@ -1062,7 +1077,8 @@ static int __init atmci_probe(struct platform_device *pdev)
mmc->f_min = (host->bus_hz + 511) / 512;
mmc->f_max = host->bus_hz / 2;
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
- mmc->caps |= MMC_CAP_4_BIT_DATA;
+ if (slot->bus_width >= 4)
+ mmc->caps |= MMC_CAP_4_BIT_DATA;
mmc->max_hw_segs = 64;
mmc->max_phys_segs = 64;
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