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Date: Mon, 18 Jan 2010 22:01:52 +0100
From: Alberto Panizzo <maramaopercheseimorto@...il.com>
To: Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Liam Girdwood <lrg@...mlogic.co.uk>,
Sascha linux-arm <s.hauer@...gutronix.de>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-arm-kernel-infradead <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] regulator: mc13783: consider Power Gates as digital
regulators.
On lun, 2010-01-18 at 20:04 +0100, Uwe Kleine-König wrote:
> Hello Alberto,
Hello Uwe!
>
> Can you post an updated patch addressing the discussion with Mark,
> please?
>
> From the first look I don't like the name
> MC13783_REG_POWERMISC_PWGTSPI_M as I don't understand it's purpose
>>From now the present driver naming schema is mask ends in _M.
>
> What is the base for your patch? (Hm, it seems next could work.
Yes, this patch is based on:
git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6.git for-next
> mc13783-regulator seems to have gotten some more #defines ending in _M.
> You seem to mean "mask". IMHO it's a bit unfortunate, because the
> nameing scheme doesn't match the already existing names :-()
If the naming schema adopted, conflicts other I will propose a correction..
>
> Shouldn't mc13783_state_powermisc_pwgt be a per-device variable instead
> of a static variable?
Thanks for point me out this. It should.
the new patch below:
--------------------------------------------------------------------------
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.
Signed-off-by: Alberto Panizzo <maramaopercheseimorto@...il.com>
---
drivers/regulator/mc13783-regulator.c | 109 ++++++++++++++++++++++++++++++++-
include/linux/mfd/mc13783.h | 2 +
2 files changed, 110 insertions(+), 1 deletions(-)
diff --git a/drivers/regulator/mc13783-regulator.c b/drivers/regulator/mc13783-regulator.c
index a40e35a..555eb29 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;
@@ -163,6 +168,7 @@ static const int const mc13783_vrf_val[] = {
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] = { \
@@ -201,7 +207,7 @@ static struct regulator_ops mc13783_fixed_regulator_ops;
[MC13783_ ## prefix ## _ ## _name] = { \
.desc = { \
.name = #prefix "_" #_name, \
- .ops = &mc13783_regulator_ops, \
+ .ops = &mc13783_gpo_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MC13783_ ## prefix ## _ ## _name, \
.owner = THIS_MODULE, \
@@ -253,10 +259,13 @@ static struct mc13783_regulator mc13783_regulators[] = {
MC13783_GPO_DEFINE(REGU, GPO2, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO3, POWERMISC),
MC13783_GPO_DEFINE(REGU, GPO4, POWERMISC),
+ MC13783_GPO_DEFINE(REGU, PWGT1SPI, POWERMISC),
+ MC13783_GPO_DEFINE(REGU, PWGT2SPI, POWERMISC),
};
struct mc13783_regulator_priv {
struct mc13783 *mc13783;
+ u32 powermisc_pwgt_state;
struct regulator_dev *regulators[];
};
@@ -445,6 +454,104 @@ 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,
+};
+
static int __devinit mc13783_regulator_probe(struct platform_device *pdev)
{
struct mc13783_regulator_priv *priv;
diff --git a/include/linux/mfd/mc13783.h b/include/linux/mfd/mc13783.h
index 3568040..94cb51a 100644
--- a/include/linux/mfd/mc13783.h
+++ b/include/linux/mfd/mc13783.h
@@ -108,6 +108,8 @@ int mc13783_adc_do_conversion(struct mc13783 *mc13783, unsigned int mode,
#define MC13783_REGU_V2 28
#define MC13783_REGU_V3 29
#define MC13783_REGU_V4 30
+#define MC13783_REGU_PWGT1SPI 31
+#define MC13783_REGU_PWGT2SPI 32
#define MC13783_IRQ_ADCDONE 0
#define MC13783_IRQ_ADCBISDONE 1
--
1.6.3.3
--
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