tegra: harmony: wifi: add board support for WiFi

The SDIO WiFi module requires power from external PMU and 1.2V regulator.
The module gets powered on if - (1) all power sources are enabled, and
(2) power (down) and reset (down) pins are enabled as per spec.

To enable mmc/SDIO driver to detect the WiFi hardware, the WiFi chip has
to be powered-up before mmc driver does probing. So, steps should be as
following: (1) required regulators are on, (2) power/reset of WiFi are
enabled, (3) mmc does probing. Later time, when WiFi driver module is
loaded and registers with SDIO, the SDIO driver knows which H/W the driver
has to be associated with.

Bug: 908534
Change-Id: I6510bced5fa9b8b3314c00180f2694903b23145c
Reviewed-on: http://git-master/r/#change,47808,patchset=2
Signed-off-by: Preetham Chandru <pchandru@nvidia.com>
Reviewed-on: http://git-master/r/67121
Reviewed-by: Mursalin Akon <makon@nvidia.com>
Reviewed-by: Allen Martin <amartin@nvidia.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/board-harmony-power.c b/arch/arm/mach-tegra/board-harmony-power.c
index a8da38f53f27..9ebc04baee2f 100644
--- a/arch/arm/mach-tegra/board-harmony-power.c
+++ b/arch/arm/mach-tegra/board-harmony-power.c
@@ -20,6 +20,7 @@
 #include <linux/gpio.h>
 
 #include <linux/regulator/machine.h>
+#include <linux/regulator/fixed.h>
 #include <linux/mfd/tps6586x.h>
 #include <linux/io.h>
 
@@ -90,6 +91,101 @@ static struct regulator_consumer_supply tps658621_ldo9_supply[] = {
 	REGULATOR_SUPPLY("avdd_amp", NULL),
 };
 
+/* regulator supplies power to WWAN - by default disable */
+static struct regulator_consumer_supply vdd_1v5_consumer_supply[] = {
+	REGULATOR_SUPPLY("vdd_1v5", NULL),
+};
+
+static struct regulator_init_data vdd_1v5_initdata = {
+	.consumer_supplies = vdd_1v5_consumer_supply,
+	.num_consumer_supplies = 1,
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		.always_on = 0,
+	},
+};
+
+static struct fixed_voltage_config vdd_1v5 = {
+	.supply_name		= "vdd_1v5",
+	.microvolts		= 1500000, /* Enable 1.5V */
+	.gpio			= TPS_GPIO_EN_1V5, /* GPIO BASE+0 */
+	.startup_delay		= 0,
+	.enable_high		= 0,
+	.enabled_at_boot	= 0,
+	.init_data		= &vdd_1v5_initdata,
+};
+
+/* regulator supplies power to WLAN - enable here, to satisfy SDIO probing */
+static struct regulator_consumer_supply vdd_1v2_consumer_supply[] = {
+	REGULATOR_SUPPLY("vdd_1v2", NULL),
+};
+
+static struct regulator_init_data vdd_1v2_initdata = {
+	.consumer_supplies = vdd_1v2_consumer_supply,
+	.num_consumer_supplies = 1,
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		.always_on = 1,
+	},
+};
+
+static struct fixed_voltage_config vdd_1v2 = {
+	.supply_name		= "vdd_1v2",
+	.microvolts		= 1200000, /* Enable 1.2V */
+	.gpio			= TPS_GPIO_EN_1V2, /* GPIO BASE+1 */
+	.startup_delay		= 0,
+	.enable_high		= 1,
+	.enabled_at_boot	= 1,
+	.init_data		= &vdd_1v2_initdata,
+};
+
+/* regulator supplies power to PLL - enable here */
+static struct regulator_consumer_supply vdd_1v05_consumer_supply[] = {
+	REGULATOR_SUPPLY("vdd_1v05", NULL),
+};
+
+static struct regulator_init_data vdd_1v05_initdata = {
+	.consumer_supplies = vdd_1v05_consumer_supply,
+	.num_consumer_supplies = 1,
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		.always_on = 1,
+	},
+};
+
+static struct fixed_voltage_config vdd_1v05 = {
+	.supply_name		= "vdd_1v05",
+	.microvolts		= 1050000, /* Enable 1.05V */
+	.gpio			= TPS_GPIO_EN_1V05, /* BASE+2 */
+	.startup_delay		= 0,
+	.enable_high		= 1,
+	.enabled_at_boot	= 0,
+	.init_data		= &vdd_1v05_initdata,
+};
+
+/* mode pin for 1.05V regulator - enable here */
+static struct regulator_consumer_supply vdd_1v05_mode_consumer_supply[] = {
+	REGULATOR_SUPPLY("vdd_1v05_mode", NULL),
+};
+
+static struct regulator_init_data vdd_1v05_mode_initdata = {
+	.consumer_supplies = vdd_1v05_mode_consumer_supply,
+	.num_consumer_supplies = 1,
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+		.always_on = 1,
+	},
+};
+
+static struct fixed_voltage_config vdd_1v05_mode = {
+	.supply_name		= "vdd_1v05_mode",
+	.microvolts		= 1050000, /* Enable 1.05V */
+	.gpio			= TPS_GPIO_MODE_1V05, /* BASE+3 */
+	.startup_delay		= 0,
+	.enable_high		= 1,
+	.enabled_at_boot	= 0,
+	.init_data		= &vdd_1v05_mode_initdata,
+};
 
 #define REGULATOR_INIT(_id, _minmv, _maxmv)				\
 	{								\
@@ -131,6 +227,13 @@ static struct tps6586x_rtc_platform_data rtc_data = {
 		.platform_data = _data,		\
 	}
 
+#define TPS_GPIO_FIXED_REG(_id, _data)		\
+	{					\
+		.id = _id,			\
+		.name = "reg-fixed-voltage",	\
+		.platform_data = _data,		\
+	}
+
 static struct tps6586x_subdev_info tps_devs[] = {
 	TPS_REG(SM_0, &sm0_data),
 	TPS_REG(SM_1, &sm1_data),
@@ -145,6 +248,10 @@ static struct tps6586x_subdev_info tps_devs[] = {
 	TPS_REG(LDO_7, &ldo7_data),
 	TPS_REG(LDO_8, &ldo8_data),
 	TPS_REG(LDO_9, &ldo9_data),
+	TPS_GPIO_FIXED_REG(0, &vdd_1v5),
+	TPS_GPIO_FIXED_REG(1, &vdd_1v2),
+	TPS_GPIO_FIXED_REG(2, &vdd_1v05),
+	TPS_GPIO_FIXED_REG(3, &vdd_1v05_mode),
 	{
 	 .id = 0,
 	 .name = "tps6586x-rtc",