diff options
| author | Pierre Ossman <drzeus@drzeus.cx> | 2006-11-08 23:06:35 +0100 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2006-12-01 18:54:10 +0100 |
| commit | 077df884835ebf2b5db16aacd9a24691d89902a0 (patch) | |
| tree | 6d812005b3f5c9062ccd8dd2157a558a9bb1f0ed /drivers/mmc | |
| parent | 7ccd266e676a3f0c6f8f897f58b684cac3dd1650 (diff) | |
mmc: sdhci high speed support
The SDHCI spec implies that is is incorrect to set a clock
frequency above 25 MHz without setting the high speed bit.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/sdhci.c | 15 | ||||
| -rw-r--r-- | drivers/mmc/sdhci.h | 2 |
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index 54990ed26770..cd98117632d3 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -616,6 +616,7 @@ static void sdhci_finish_command(struct sdhci_host *host) static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) { int div; + u8 ctrl; u16 clk; unsigned long timeout; @@ -624,6 +625,13 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL); + ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL); + if (clock > 25000000) + ctrl |= SDHCI_CTRL_HISPD; + else + ctrl &= ~SDHCI_CTRL_HISPD; + writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL); + if (clock == 0) goto out; @@ -1291,6 +1299,13 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot) else if (caps & SDHCI_CAN_VDD_180) mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19; + if ((host->max_clk > 25000000) && !(caps & SDHCI_CAN_DO_HISPD)) { + printk(KERN_ERR "%s: Controller reports > 25 MHz base clock," + " but no high speed support.\n", + host->slot_descr); + mmc->f_max = 25000000; + } + if (mmc->ocr_avail == 0) { printk(KERN_ERR "%s: Hardware doesn't report any " "support voltages.\n", host->slot_descr); diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h index 72a67937afe0..f9d1a0a6f03a 100644 --- a/drivers/mmc/sdhci.h +++ b/drivers/mmc/sdhci.h @@ -71,6 +71,7 @@ #define SDHCI_HOST_CONTROL 0x28 #define SDHCI_CTRL_LED 0x01 #define SDHCI_CTRL_4BITBUS 0x02 +#define SDHCI_CTRL_HISPD 0x04 #define SDHCI_POWER_CONTROL 0x29 #define SDHCI_POWER_ON 0x01 @@ -138,6 +139,7 @@ #define SDHCI_CLOCK_BASE_SHIFT 8 #define SDHCI_MAX_BLOCK_MASK 0x00030000 #define SDHCI_MAX_BLOCK_SHIFT 16 +#define SDHCI_CAN_DO_HISPD 0x00200000 #define SDHCI_CAN_DO_DMA 0x00400000 #define SDHCI_CAN_VDD_330 0x01000000 #define SDHCI_CAN_VDD_300 0x02000000 |