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authorPierre Ossman <drzeus@drzeus.cx>2006-06-30 02:22:23 -0700
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-02 16:02:01 +0100
commit146ad66eac836c0b976c98f428d73e1f6a75270d (patch)
tree7f1dd2b34a6225360fab04abffa4c9dd2e124cd2 /drivers/mmc/sdhci.c
parent51f82bc07a9673d790c2a17de8e3fa8046543f04 (diff)
[MMC] sdhci: support for multiple voltages
The sdhci controllers can support up to three voltage levels. Detect which and report back to the MMC layer. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/mmc/sdhci.c')
-rw-r--r--drivers/mmc/sdhci.c60
1 files changed, 57 insertions, 3 deletions
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 405b6158cb6..74912dcac82 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -530,6 +530,46 @@ out:
host->clock = clock;
}
+static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
+{
+ u8 pwr;
+
+ if (host->power == power)
+ return;
+
+ writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
+
+ if (power == (unsigned short)-1)
+ goto out;
+
+ pwr = SDHCI_POWER_ON;
+
+ switch (power) {
+ case MMC_VDD_170:
+ case MMC_VDD_180:
+ case MMC_VDD_190:
+ pwr |= SDHCI_POWER_180;
+ break;
+ case MMC_VDD_290:
+ case MMC_VDD_300:
+ case MMC_VDD_310:
+ pwr |= SDHCI_POWER_300;
+ break;
+ case MMC_VDD_320:
+ case MMC_VDD_330:
+ case MMC_VDD_340:
+ pwr |= SDHCI_POWER_330;
+ break;
+ default:
+ BUG();
+ }
+
+ writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
+
+out:
+ host->power = power;
+}
+
/*****************************************************************************\
* *
* MMC callbacks *
@@ -584,9 +624,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
sdhci_set_clock(host, ios->clock);
if (ios->power_mode == MMC_POWER_OFF)
- writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
+ sdhci_set_power(host, -1);
else
- writeb(0xFF, host->ioaddr + SDHCI_POWER_CONTROL);
+ sdhci_set_power(host, ios->vdd);
ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
if (ios->bus_width == MMC_BUS_WIDTH_4)
@@ -1046,9 +1086,23 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
mmc->ops = &sdhci_ops;
mmc->f_min = host->max_clk / 256;
mmc->f_max = host->max_clk;
- mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
mmc->caps = MMC_CAP_4_BIT_DATA;
+ mmc->ocr_avail = 0;
+ if (caps & SDHCI_CAN_VDD_330)
+ mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
+ else if (caps & SDHCI_CAN_VDD_300)
+ mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
+ else if (caps & SDHCI_CAN_VDD_180)
+ mmc->ocr_avail |= MMC_VDD_17_18|MMC_VDD_18_19;
+
+ if (mmc->ocr_avail == 0) {
+ printk(KERN_ERR "%s: Hardware doesn't report any "
+ "support voltages.\n", host->slot_descr);
+ ret = -ENODEV;
+ goto unmap;
+ }
+
spin_lock_init(&host->lock);
/*