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Date: Mon, 1 Apr 2013 18:28:10 +0100
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: Samuel Ortiz <sameo@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 13/15] mfd: arizona: Add a hardware patch mechanism
From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
This patch adds facilities for apply a register patch contained within
the chip using the write sequencer.
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
drivers/mfd/arizona-core.c | 103 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 103 insertions(+)
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 559129e..6ca5cfb 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -242,6 +242,84 @@ static int arizona_wait_for_boot(struct arizona *arizona)
return ret;
}
+static int arizona_apply_hardware_patch(struct arizona* arizona)
+{
+ unsigned int fll, sysclk;
+ int ret;
+
+ regcache_cache_bypass(arizona->regmap, true);
+
+ /* Cache existing FLL and SYSCLK settings */
+ ret = regmap_read(arizona->regmap, ARIZONA_FLL1_CONTROL_1, &fll);
+ if (ret < 0) {
+ dev_err(arizona->dev, "Failed to cache FLL settings: %d\n",
+ ret);
+ return ret;
+ }
+ ret = regmap_read(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, &sysclk);
+ if (ret < 0) {
+ dev_err(arizona->dev, "Failed to cache SYSCLK settings: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* Start up SYSCLK using the FLL in free running mode */
+ ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1,
+ ARIZONA_FLL1_ENA | ARIZONA_FLL1_FREERUN);
+ if (ret < 0) {
+ dev_err(arizona->dev,
+ "Failed to start FLL in freerunning mode: %d\n",
+ ret);
+ return ret;
+ }
+ ret = arizona_poll_reg(arizona, 25, ARIZONA_INTERRUPT_RAW_STATUS_5,
+ ARIZONA_FLL1_CLOCK_OK_STS,
+ ARIZONA_FLL1_CLOCK_OK_STS);
+ if (ret < 0) {
+ ret = -ETIMEDOUT;
+ goto err_fll;
+ }
+
+ ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, 0x0144);
+ if (ret < 0) {
+ dev_err(arizona->dev, "Failed to start SYSCLK: %d\n", ret);
+ goto err_fll;
+ }
+
+ /* Start the write sequencer and wait for it to finish */
+ ret = regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
+ ARIZONA_WSEQ_ENA | ARIZONA_WSEQ_START | 160);
+ if (ret < 0) {
+ dev_err(arizona->dev, "Failed to start write sequencer: %d\n",
+ ret);
+ goto err_sysclk;
+ }
+ ret = arizona_poll_reg(arizona, 5, ARIZONA_WRITE_SEQUENCER_CTRL_1,
+ ARIZONA_WSEQ_BUSY, 0);
+ if (ret < 0) {
+ regmap_write(arizona->regmap, ARIZONA_WRITE_SEQUENCER_CTRL_0,
+ ARIZONA_WSEQ_ABORT);
+ ret = -ETIMEDOUT;
+ }
+
+err_sysclk:
+ ret = regmap_write(arizona->regmap, ARIZONA_SYSTEM_CLOCK_1, sysclk);
+ if (ret < 0)
+ dev_err(arizona->dev,
+ "Failed to re-apply old SYSCLK settings: %d\n",
+ ret);
+
+err_fll:
+ ret = regmap_write(arizona->regmap, ARIZONA_FLL1_CONTROL_1, fll);
+ if (ret < 0)
+ dev_err(arizona->dev,
+ "Failed to re-apply old FLL settings: %d\n",
+ ret);
+
+ regcache_cache_bypass(arizona->regmap, false);
+ return ret;
+}
+
#ifdef CONFIG_PM_RUNTIME
static int arizona_runtime_resume(struct device *dev)
{
@@ -272,6 +350,17 @@ static int arizona_runtime_resume(struct device *dev)
ret);
goto err;
}
+
+ ret = arizona_apply_hardware_patch(arizona);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to apply hardware patch: %d\n",
+ ret);
+ goto err;
+ }
+ break;
+ default:
+ break;
}
ret = regcache_sync(arizona->regmap);
@@ -510,6 +599,20 @@ int arizona_dev_init(struct arizona *arizona)
ret);
goto err_reset;
}
+
+ switch (arizona->type) {
+ case WM5102:
+ ret = arizona_apply_hardware_patch(arizona);
+ if (ret != 0) {
+ dev_err(arizona->dev,
+ "Failed to apply hardware patch: %d\n",
+ ret);
+ goto err_reset;
+ }
+ break;
+ default:
+ break;
+ }
}
for (i = 0; i < ARRAY_SIZE(arizona->pdata.gpio_defaults); i++) {
--
1.7.10.4
--
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