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[MMC] sdhci: support for multiple voltages

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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>
This commit is contained in:
Pierre Ossman 2006-06-30 02:22:23 -07:00 committed by Russell King
parent 51f82bc07a
commit 146ad66eac
2 changed files with 66 additions and 4 deletions
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60
drivers/mmc/sdhci.c
View File

@ -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);
/*

10
drivers/mmc/sdhci.h
View File

@ -67,6 +67,10 @@
#define SDHCI_CTRL_4BITBUS 0x02
#define SDHCI_POWER_CONTROL 0x29
#define SDHCI_POWER_ON 0x01
#define SDHCI_POWER_180 0x0A
#define SDHCI_POWER_300 0x0C
#define SDHCI_POWER_330 0x0E
#define SDHCI_BLOCK_GAP_CONTROL 0x2A
@ -121,9 +125,12 @@
/* 3E-3F reserved */
#define SDHCI_CAPABILITIES 0x40
#define SDHCI_CAN_DO_DMA 0x00400000
#define SDHCI_CLOCK_BASE_MASK 0x00003F00
#define SDHCI_CLOCK_BASE_SHIFT 8
#define SDHCI_CAN_DO_DMA 0x00400000
#define SDHCI_CAN_VDD_330 0x01000000
#define SDHCI_CAN_VDD_300 0x02000000
#define SDHCI_CAN_VDD_180 0x04000000
/* 44-47 reserved for more caps */
@ -151,6 +158,7 @@ struct sdhci_host {
unsigned int max_clk; /* Max possible freq (MHz) */
unsigned int clock; /* Current clock (MHz) */
unsigned short power; /* Current voltage */
struct mmc_request *mrq; /* Current request */
struct mmc_command *cmd; /* Current command */