#include <linux/err.h>
#include <linux/leds.h>
#include <linux/scatterlist.h>
+#include <linux/log2.h>
+#include <linux/regulator/consumer.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
data->timeout_clks = 0;
}
}
+ /*
+ * Some cards need very high timeouts if driven in SPI mode.
+ * The worst observed timeout was 900ms after writing a
+ * continuous stream of data until the internal logic
+ * overflowed.
+ */
+ if (mmc_host_is_spi(card->host)) {
+ if (data->flags & MMC_DATA_WRITE) {
+ if (data->timeout_ns < 1000000000)
+ data->timeout_ns = 1000000000; /* 1s */
+ } else {
+ if (data->timeout_ns < 100000000)
+ data->timeout_ns = 100000000; /* 100ms */
+ }
+ }
}
EXPORT_SYMBOL(mmc_set_data_timeout);
mmc_set_ios(host);
}
+/**
+ * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
+ * @vdd: voltage (mV)
+ * @low_bits: prefer low bits in boundary cases
+ *
+ * This function returns the OCR bit number according to the provided @vdd
+ * value. If conversion is not possible a negative errno value returned.
+ *
+ * Depending on the @low_bits flag the function prefers low or high OCR bits
+ * on boundary voltages. For example,
+ * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
+ * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
+ *
+ * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
+ */
+static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
+{
+ const int max_bit = ilog2(MMC_VDD_35_36);
+ int bit;
+
+ if (vdd < 1650 || vdd > 3600)
+ return -EINVAL;
+
+ if (vdd >= 1650 && vdd <= 1950)
+ return ilog2(MMC_VDD_165_195);
+
+ if (low_bits)
+ vdd -= 1;
+
+ /* Base 2000 mV, step 100 mV, bit's base 8. */
+ bit = (vdd - 2000) / 100 + 8;
+ if (bit > max_bit)
+ return max_bit;
+ return bit;
+}
+
+/**
+ * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
+ * @vdd_min: minimum voltage value (mV)
+ * @vdd_max: maximum voltage value (mV)
+ *
+ * This function returns the OCR mask bits according to the provided @vdd_min
+ * and @vdd_max values. If conversion is not possible the function returns 0.
+ *
+ * Notes wrt boundary cases:
+ * This function sets the OCR bits for all boundary voltages, for example
+ * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
+ * MMC_VDD_34_35 mask.
+ */
+u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
+{
+ u32 mask = 0;
+
+ if (vdd_max < vdd_min)
+ return 0;
+
+ /* Prefer high bits for the boundary vdd_max values. */
+ vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
+ if (vdd_max < 0)
+ return 0;
+
+ /* Prefer low bits for the boundary vdd_min values. */
+ vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
+ if (vdd_min < 0)
+ return 0;
+
+ /* Fill the mask, from max bit to min bit. */
+ while (vdd_max >= vdd_min)
+ mask |= 1 << vdd_max--;
+
+ return mask;
+}
+EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
+
+#ifdef CONFIG_REGULATOR
+
+/**
+ * mmc_regulator_get_ocrmask - return mask of supported voltages
+ * @supply: regulator to use
+ *
+ * This returns either a negative errno, or a mask of voltages that
+ * can be provided to MMC/SD/SDIO devices using the specified voltage
+ * regulator. This would normally be called before registering the
+ * MMC host adapter.
+ */
+int mmc_regulator_get_ocrmask(struct regulator *supply)
+{
+ int result = 0;
+ int count;
+ int i;
+
+ count = regulator_count_voltages(supply);
+ if (count < 0)
+ return count;
+
+ for (i = 0; i < count; i++) {
+ int vdd_uV;
+ int vdd_mV;
+
+ vdd_uV = regulator_list_voltage(supply, i);
+ if (vdd_uV <= 0)
+ continue;
+
+ vdd_mV = vdd_uV / 1000;
+ result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
+ }
+
+ return result;
+}
+EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
+
+/**
+ * mmc_regulator_set_ocr - set regulator to match host->ios voltage
+ * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
+ * @supply: regulator to use
+ *
+ * Returns zero on success, else negative errno.
+ *
+ * MMC host drivers may use this to enable or disable a regulator using
+ * a particular supply voltage. This would normally be called from the
+ * set_ios() method.
+ */
+int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit)
+{
+ int result = 0;
+ int min_uV, max_uV;
+ int enabled;
+
+ enabled = regulator_is_enabled(supply);
+ if (enabled < 0)
+ return enabled;
+
+ if (vdd_bit) {
+ int tmp;
+ int voltage;
+
+ /* REVISIT mmc_vddrange_to_ocrmask() may have set some
+ * bits this regulator doesn't quite support ... don't
+ * be too picky, most cards and regulators are OK with
+ * a 0.1V range goof (it's a small error percentage).
+ */
+ tmp = vdd_bit - ilog2(MMC_VDD_165_195);
+ if (tmp == 0) {
+ min_uV = 1650 * 1000;
+ max_uV = 1950 * 1000;
+ } else {
+ min_uV = 1900 * 1000 + tmp * 100 * 1000;
+ max_uV = min_uV + 100 * 1000;
+ }
+
+ /* avoid needless changes to this voltage; the regulator
+ * might not allow this operation
+ */
+ voltage = regulator_get_voltage(supply);
+ if (voltage < 0)
+ result = voltage;
+ else if (voltage < min_uV || voltage > max_uV)
+ result = regulator_set_voltage(supply, min_uV, max_uV);
+ else
+ result = 0;
+
+ if (result == 0 && !enabled)
+ result = regulator_enable(supply);
+ } else if (enabled) {
+ result = regulator_disable(supply);
+ }
+
+ return result;
+}
+EXPORT_SYMBOL(mmc_regulator_set_ocr);
+
+#endif
+
/*
* Mask off any voltages we don't support and select
* the lowest voltage
host->ios.vdd = bit;
mmc_set_ios(host);
} else {
+ pr_warning("%s: host doesn't support card's voltages\n",
+ mmc_hostname(host));
ocr = 0;
}
spin_unlock_irqrestore(&host->lock, flags);
#endif
+ cancel_delayed_work(&host->detect);
mmc_flush_scheduled_work();
mmc_bus_get(host);
*/
int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
{
+ cancel_delayed_work(&host->detect);
mmc_flush_scheduled_work();
mmc_bus_get(host);
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
mmc_power_up(host);
+ mmc_select_voltage(host, host->ocr);
BUG_ON(!host->bus_ops->resume);
host->bus_ops->resume(host);
}
Code Review / linux-2.6.git / blobdiff