ARM: 5721/1: MMCI enable the use of a regulator

This enables the use of a regulator to power the MMCI/PL180
PrimeCell. The OCR mask is calculated and voltage is set using
the new MMC core functions for discovering voltage ranges
in regulators. The platform translate_vdd function which basically
controls the 4 lines out of the PL180 is disabled if you use a
regulator instead.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 47 insertions, 4 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 79205e565c07..3d1e5329da12 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -23,6 +23,7 @@
 #include <linux/scatterlist.h>
 #include <linux/gpio.h>
 #include <linux/amba/mmci.h>
+#include <linux/regulator/consumer.h>
 
 #include <asm/cacheflush.h>
 #include <asm/div64.h>
@@ -452,13 +453,28 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         u32 pwr = 0;
         unsigned long flags;
 
-        if (host->plat->translate_vdd)
-                pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
-
         switch (ios->power_mode) {
         case MMC_POWER_OFF:
+                if(host->vcc &&
+                   regulator_is_enabled(host->vcc))
+                        regulator_disable(host->vcc);
                 break;
         case MMC_POWER_UP:
+#ifdef CONFIG_REGULATOR
+                if (host->vcc)
+                        /* This implicitly enables the regulator */
+                        mmc_regulator_set_ocr(host->vcc, ios->vdd);
+#endif
+                /*
+                 * The translate_vdd function is not used if you have
+                 * an external regulator, or your design is really weird.
+                 * Using it would mean sending in power control BOTH using
+                 * a regulator AND the 4 MMCIPWR bits. If we don't have
+                 * a regulator, we might have some other platform specific
+                 * power control behind this translate function.
+                 */
+                if (!host->vcc && host->plat->translate_vdd)
+                        pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
                 /* The ST version does not have this, fall through to POWER_ON */
                 if (host->hw_designer != AMBA_VENDOR_ST) {
                         pwr |= MCI_PWR_UP;
@@ -603,7 +619,29 @@ static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
         mmc->ops = &mmci_ops;
         mmc->f_min = (host->mclk + 511) / 512;
         mmc->f_max = min(host->mclk, fmax);
-        mmc->ocr_avail = plat->ocr_mask;
+#ifdef CONFIG_REGULATOR
+        /* If we're using the regulator framework, try to fetch a regulator */
+        host->vcc = regulator_get(&dev->dev, "vmmc");
+        if (IS_ERR(host->vcc))
+                host->vcc = NULL;
+        else {
+                int mask = mmc_regulator_get_ocrmask(host->vcc);
+
+                if (mask < 0)
+                        dev_err(&dev->dev, "error getting OCR mask (%d)\n",
+                                mask);
+                else {
+                        host->mmc->ocr_avail = (u32) mask;
+                        if (plat->ocr_mask)
+                                dev_warn(&dev->dev,
+                                 "Provided ocr_mask/setpower will not be used "
+                                 "(using regulator instead)\n");
+                }
+        }
+#endif
+        /* Fall back to platform data if no regulator is found */
+        if (host->vcc == NULL)
+                mmc->ocr_avail = plat->ocr_mask;
         mmc->caps = plat->capabilities;
 
         /*
@@ -741,6 +779,10 @@ static int __devexit mmci_remove(struct amba_device *dev)
                 clk_disable(host->clk);
                 clk_put(host->clk);
 
+                if (regulator_is_enabled(host->vcc))
+                        regulator_disable(host->vcc);
+                regulator_put(host->vcc);
+
                 mmc_free_host(mmc);
 
                 amba_release_regions(dev);
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index a7f9a51a0a3e..1ceb9a90f59b 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -175,6 +175,7 @@ struct mmci_host {
         struct scatterlist      *sg_ptr;
         unsigned int            sg_off;
         unsigned int            size;
+        struct regulator        *vcc;
 };
 
 static inline void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)