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Subject[PATCH 03/21] [MMC] Support for multiple voltages
Date
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>
---
drivers/mmc/sdhci.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++---
drivers/mmc/sdhci.h | 10 ++++++++-
2 files changed, 66 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index efbece3..a6238b2 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_hos
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(st
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);

/*
diff --git a/drivers/mmc/sdhci.h b/drivers/mmc/sdhci.h
index 3b270ef..aed4abd 100644
--- a/drivers/mmc/sdhci.h
+++ b/drivers/mmc/sdhci.h
@@ -67,6 +67,10 @@ #define SDHCI_CTRL_LED 0x01
#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 @@ #define SDHCI_ACMD12_ERR 0x3C
/* 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 @@ #define SDHCI_USE_DMA (1<<0)
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 */
-
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