regulator: mc13783: consider Power Gates as digital regulators.

GPO regulators are digital outputs that can be enabled or disabled by a
dedicated bit in mc13783 POWERMISC register.
In this family can be count in also Power Gates (PWGT1 and 2): enabled by
a dedicated pin a Power Gate is an hardware driven supply where the output
(PWGTnDRV) follow this law:

 Bit PWGTxSPIEN | Pin PWGTxEN | PWGTxDRV |  Read Back
   0 = default  |             |          | PWGTxSPIEN
 ---------------+-------------+----------+------------
       1        |      x      |   Low    |     0
       0        |      0      |   High   |     1
       0        |      1      |   Low    |     0

As read back value of control bit reflects the PWGTxDRV state (not the
control value previously written) and mc13783 POWERMISC register contain
only regulator related bits, a dedicated function to manage these bits is
created here with the aim of tracing the real value of PWGTxSPIEN bits
and reproduce it on next writes.

All POWERMISC users _must_ use the new function to not accidentally
disable Power Gates supplies.

v2 changes:
-Better utilization of abstraction layers.
-Voltage query support. GPO's and PWGTxDRV are fixed voltage regulator
 with voltage value of 3.1V and 5.5V respectively.

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 126 insertions, 6 deletions

diff --git a/drivers/regulator/mc13783-regulator.c b/drivers/regulator/mc13783-regulator.c
index a40e35ab855..f7b81845a19 100644
--- a/drivers/regulator/mc13783-regulator.c
+++ b/drivers/regulator/mc13783-regulator.c
@@ -82,6 +82,11 @@
 #define MC13783_REG_POWERMISC_GPO2EN                    (1 << 8)
 #define MC13783_REG_POWERMISC_GPO3EN                    (1 << 10)
 #define MC13783_REG_POWERMISC_GPO4EN                    (1 << 12)
+#define MC13783_REG_POWERMISC_PWGT1SPIEN                (1 << 15)
+#define MC13783_REG_POWERMISC_PWGT2SPIEN                (1 << 16)
+
+#define MC13783_REG_POWERMISC_PWGTSPI_M                 (3 << 15)
+
 
 struct mc13783_regulator {
         struct regulator_desc desc;
@@ -161,8 +166,17 @@ static const int const mc13783_vrf_val[] = {
         1500000, 1875000, 2700000, 2775000,
 };
 
+static const int const mc13783_gpo_val[] = {
+        3100000,
+};
+
+static const int const mc13783_pwgtdrv_val[] = {
+        5500000,
+};
+
 static struct regulator_ops mc13783_regulator_ops;
 static struct regulator_ops mc13783_fixed_regulator_ops;
+static struct regulator_ops mc13783_gpo_regulator_ops;
 
 #define MC13783_DEFINE(prefix, _name, _reg, _vsel_reg, _voltages)       \
         [MC13783_ ## prefix ## _ ## _name] = {                          \
@@ -197,17 +211,19 @@ static struct regulator_ops mc13783_fixed_regulator_ops;
                 .voltages =  _voltages,                                 \
         }
 
-#define MC13783_GPO_DEFINE(prefix, _name, _reg)                         \
+#define MC13783_GPO_DEFINE(prefix, _name, _reg,  _voltages)             \
         [MC13783_ ## prefix ## _ ## _name] = {                          \
                 .desc = {                                               \
                         .name = #prefix "_" #_name,                     \
-                        .ops = &mc13783_regulator_ops,                  \
+                        .n_voltages = ARRAY_SIZE(_voltages),            \
+                        .ops = &mc13783_gpo_regulator_ops,              \
                         .type = REGULATOR_VOLTAGE,                      \
                         .id = MC13783_ ## prefix ## _ ## _name,         \
                         .owner = THIS_MODULE,                           \
                 },                                                      \
                 .reg = MC13783_REG_ ## _reg,                            \
                 .enable_bit = MC13783_REG_ ## _reg ## _ ## _name ## EN, \
+                .voltages =  _voltages,                                 \
         }
 
 #define MC13783_DEFINE_SW(_name, _reg, _vsel_reg, _voltages)            \
@@ -249,14 +265,17 @@ static struct mc13783_regulator mc13783_regulators[] = {
                             mc13783_vmmc_val),
         MC13783_DEFINE_REGU(VMMC2, REGULATORMODE1, REGULATORSETTING1,   \
                             mc13783_vmmc_val),
-        MC13783_GPO_DEFINE(REGU, GPO1, POWERMISC),
-        MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC),
-        MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC),
-        MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC),
+        MC13783_GPO_DEFINE(REGU, GPO1, POWERMISC, mc13783_gpo_val),
+        MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC, mc13783_gpo_val),
+        MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC, mc13783_gpo_val),
+        MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC, mc13783_gpo_val),
+        MC13783_GPO_DEFINE(REGU, PWGT1SPI, POWERMISC, mc13783_pwgtdrv_val),
+        MC13783_GPO_DEFINE(REGU, PWGT2SPI, POWERMISC, mc13783_pwgtdrv_val),
 };
 
 struct mc13783_regulator_priv {
         struct mc13783 *mc13783;
+        u32 powermisc_pwgt_state;
         struct regulator_dev *regulators[];
 };
 
@@ -445,6 +464,107 @@ static struct regulator_ops mc13783_fixed_regulator_ops = {
         .get_voltage = mc13783_fixed_regulator_get_voltage,
 };
 
+int mc13783_powermisc_rmw(struct mc13783_regulator_priv *priv, u32 mask,
+                                                                        u32 val)
+{
+        struct mc13783 *mc13783 = priv->mc13783;
+        int ret;
+        u32 valread;
+
+        BUG_ON(val & ~mask);
+
+        ret = mc13783_reg_read(mc13783, MC13783_REG_POWERMISC, &valread);
+        if (ret)
+                return ret;
+
+        /* Update the stored state for Power Gates. */
+        priv->powermisc_pwgt_state =
+                                (priv->powermisc_pwgt_state & ~mask) | val;
+        priv->powermisc_pwgt_state &= MC13783_REG_POWERMISC_PWGTSPI_M;
+
+        /* Construct the new register value */
+        valread = (valread & ~mask) | val;
+        /* Overwrite the PWGTxEN with the stored version */
+        valread = (valread & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
+                                                priv->powermisc_pwgt_state;
+
+        return mc13783_reg_write(mc13783, MC13783_REG_POWERMISC, valread);
+}
+
+static int mc13783_gpo_regulator_enable(struct regulator_dev *rdev)
+{
+        struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
+        int ret;
+        u32 en_val = mc13783_regulators[id].enable_bit;
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+        /* Power Gate enable value is 0 */
+        if (id == MC13783_REGU_PWGT1SPI ||
+            id == MC13783_REGU_PWGT2SPI)
+                en_val = 0;
+
+        mc13783_lock(priv->mc13783);
+        ret = mc13783_powermisc_rmw(priv, mc13783_regulators[id].enable_bit,
+                                        en_val);
+        mc13783_unlock(priv->mc13783);
+
+        return ret;
+}
+
+static int mc13783_gpo_regulator_disable(struct regulator_dev *rdev)
+{
+        struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
+        int id = rdev_get_id(rdev);
+        int ret;
+        u32 dis_val = 0;
+
+        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+        /* Power Gate disable value is 1 */
+        if (id == MC13783_REGU_PWGT1SPI ||
+            id == MC13783_REGU_PWGT2SPI)
+                dis_val = mc13783_regulators[id].enable_bit;
+
+        mc13783_lock(priv->mc13783);
+        ret = mc13783_powermisc_rmw(priv, mc13783_regulators[id].enable_bit,
+                                        dis_val);
+        mc13783_unlock(priv->mc13783);
+
+        return ret;
+}
+
+static int mc13783_gpo_regulator_is_enabled(struct regulator_dev *rdev)
+{
+        struct mc13783_regulator_priv *priv = rdev_get_drvdata(rdev);
+        int ret, id = rdev_get_id(rdev);
+        unsigned int val;
+
+        mc13783_lock(priv->mc13783);
+        ret = mc13783_reg_read(priv->mc13783, mc13783_regulators[id].reg, &val);
+        mc13783_unlock(priv->mc13783);
+
+        if (ret)
+                return ret;
+
+        /* Power Gates state is stored in powermisc_pwgt_state
+         * where the meaning of bits is negated */
+        val = (val & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
+              (priv->powermisc_pwgt_state ^ MC13783_REG_POWERMISC_PWGTSPI_M);
+
+        return (val & mc13783_regulators[id].enable_bit) != 0;
+}
+
+static struct regulator_ops mc13783_gpo_regulator_ops = {
+        .enable = mc13783_gpo_regulator_enable,
+        .disable = mc13783_gpo_regulator_disable,
+        .is_enabled = mc13783_gpo_regulator_is_enabled,
+        .list_voltage = mc13783_regulator_list_voltage,
+        .set_voltage = mc13783_fixed_regulator_set_voltage,
+        .get_voltage = mc13783_fixed_regulator_get_voltage,
+};
+
 static int __devinit mc13783_regulator_probe(struct platform_device *pdev)
 {
         struct mc13783_regulator_priv *priv;