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: 829647
Change-Id: I55724cf9dfb6bd2b9f9133632b31d6eef072a35f
signed-off-by: Preetham Chandru <pchandru@nvidia.com>
Reviewed-on: http://git-master/r/47808
Reviewed-by: Allen R Martin <amartin@nvidia.com>

4 files changed, 179 insertions, 5 deletions

diff --git a/arch/arm/mach-tegra/board-harmony-pinmux.c b/arch/arm/mach-tegra/board-harmony-pinmux.c
index e5451a1f55dc..d3e7146014be 100644
--- a/arch/arm/mach-tegra/board-harmony-pinmux.c
+++ b/arch/arm/mach-tegra/board-harmony-pinmux.c
@@ -20,6 +20,22 @@
 
 #include "board-harmony.h"
 
+#define DEFAULT_DRIVE(_name)                                    \
+        {                                                       \
+                .pingroup = TEGRA_DRIVE_PINGROUP_##_name,       \
+                .hsm = TEGRA_HSM_DISABLE,                       \
+                .schmitt = TEGRA_SCHMITT_ENABLE,                \
+                .drive = TEGRA_DRIVE_DIV_1,                     \
+                .pull_down = TEGRA_PULL_31,                     \
+                .pull_up = TEGRA_PULL_31,                       \
+                .slew_rising = TEGRA_SLEW_SLOWEST,              \
+                .slew_falling = TEGRA_SLEW_SLOWEST,             \
+        }
+
+static __initdata struct tegra_drive_pingroup_config harmony_drive_pinmux[] = {
+        DEFAULT_DRIVE(SDIO1),
+};
+
 static __initdata struct tegra_pingroup_config harmony_pinmux[] = {
 	{TEGRA_PINGROUP_ATA,   TEGRA_MUX_IDE,           TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
 	{TEGRA_PINGROUP_ATB,   TEGRA_MUX_SDIO4,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
@@ -106,13 +122,13 @@ static __initdata struct tegra_pingroup_config harmony_pinmux[] = {
 	{TEGRA_PINGROUP_SDB,   TEGRA_MUX_PWM,           TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SDC,   TEGRA_MUX_PWM,           TEGRA_PUPD_PULL_DOWN, TEGRA_TRI_NORMAL},
 	{TEGRA_PINGROUP_SDD,   TEGRA_MUX_PWM,           TEGRA_PUPD_PULL_UP,   TEGRA_TRI_TRISTATE},
-	{TEGRA_PINGROUP_SDIO1, TEGRA_MUX_SDIO1,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
+	{TEGRA_PINGROUP_SDIO1, TEGRA_MUX_SDIO1,         TEGRA_PUPD_PULL_UP,    TEGRA_TRI_NORMAL},
 	{TEGRA_PINGROUP_SLXA,  TEGRA_MUX_PCIE,          TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SLXC,  TEGRA_MUX_SPDIF,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SLXD,  TEGRA_MUX_SPDIF,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SLXK,  TEGRA_MUX_PCIE,          TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
-	{TEGRA_PINGROUP_SPDI,  TEGRA_MUX_RSVD2,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
-	{TEGRA_PINGROUP_SPDO,  TEGRA_MUX_RSVD2,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_TRISTATE},
+	{TEGRA_PINGROUP_SPDI,  TEGRA_MUX_RSVD2,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
+	{TEGRA_PINGROUP_SPDO,  TEGRA_MUX_RSVD2,         TEGRA_PUPD_NORMAL,    TEGRA_TRI_NORMAL},
 	{TEGRA_PINGROUP_SPIA,  TEGRA_MUX_GMI,           TEGRA_PUPD_PULL_DOWN, TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SPIB,  TEGRA_MUX_GMI,           TEGRA_PUPD_PULL_DOWN, TEGRA_TRI_TRISTATE},
 	{TEGRA_PINGROUP_SPIC,  TEGRA_MUX_GMI,           TEGRA_PUPD_PULL_UP,   TEGRA_TRI_NORMAL},
@@ -142,4 +158,6 @@ static __initdata struct tegra_pingroup_config harmony_pinmux[] = {
 void __init harmony_pinmux_init(void)
 {
 	tegra_pinmux_config_table(harmony_pinmux, ARRAY_SIZE(harmony_pinmux));
+	tegra_drive_pinmux_config_table(harmony_drive_pinmux,
+                                        ARRAY_SIZE(harmony_drive_pinmux));
 }
diff --git a/arch/arm/mach-tegra/board-harmony-power.c b/arch/arm/mach-tegra/board-harmony-power.c
index f3e81532f9f9..5b5fb8d11d60 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/platform_device.h>
 #include <linux/resource.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/fixed.h>
 #include <linux/mfd/tps6586x.h>
 #include <linux/gpio.h>
 #include <mach/suspend.h>
@@ -32,6 +33,7 @@
 #include "power.h"
 #include "wakeups-t2.h"
 #include "board.h"
+#include "board-harmony.h"
 
 #define PMC_CTRL		0x0
 #define PMC_CTRL_INTR_LOW	(1 << 17)
@@ -95,6 +97,102 @@ 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)				\
 	{								\
 		.constraints = {					\
@@ -116,7 +214,7 @@ static struct regulator_init_data sm2_data = REGULATOR_INIT(sm2, 3000, 4550);
 static struct regulator_init_data ldo0_data = REGULATOR_INIT(ldo0, 1250, 3300);
 static struct regulator_init_data ldo1_data = REGULATOR_INIT(ldo1, 725, 1500);
 static struct regulator_init_data ldo2_data = REGULATOR_INIT(ldo2, 725, 1500);
-static struct regulator_init_data ldo3_data = REGULATOR_INIT(ldo3, 1250, 3300);
+static struct regulator_init_data ldo3_data = REGULATOR_INIT(ldo3, 3300, 3300);
 static struct regulator_init_data ldo4_data = REGULATOR_INIT(ldo4, 1700, 2475);
 static struct regulator_init_data ldo5_data = REGULATOR_INIT(ldo5, 1250, 3300);
 static struct regulator_init_data ldo6_data = REGULATOR_INIT(ldo6, 1250, 3300);
@@ -135,6 +233,13 @@ 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),
@@ -149,6 +254,10 @@ 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",
diff --git a/arch/arm/mach-tegra/board-harmony.c b/arch/arm/mach-tegra/board-harmony.c
index d9e398e9fdf7..e861bfeef132 100644
--- a/arch/arm/mach-tegra/board-harmony.c
+++ b/arch/arm/mach-tegra/board-harmony.c
@@ -27,6 +27,7 @@
 #include <linux/i2c-tegra.h>
 #include <linux/io.h>
 #include <linux/delay.h>
+#include <linux/gpio.h>
 #include <linux/platform_data/tegra_usb.h>
 
 #include <asm/mach-types.h>
@@ -377,6 +378,41 @@ static __initdata struct tegra_clk_init_table harmony_clk_init_table[] = {
 	{ NULL,		NULL,		0,		0},
 };
 
+static int __init harmony_wifi_init(void)
+{
+        int gpio_pwr, gpio_rst;
+
+	if (!machine_is_harmony())
+		return 0;
+
+        /* WLAN - Power up (low) and Reset (low) */
+        gpio_pwr = gpio_request(TEGRA_GPIO_WLAN_PWR_LOW, "wlan_pwr");
+        gpio_rst = gpio_request(TEGRA_GPIO_WLAN_RST_LOW, "wlan_rst");
+        if (gpio_pwr < 0 || gpio_rst < 0)
+                pr_warning("Unable to get gpio for WLAN Power and Reset\n");
+        else {
+
+		tegra_gpio_enable(TEGRA_GPIO_WLAN_PWR_LOW);
+		tegra_gpio_enable(TEGRA_GPIO_WLAN_RST_LOW);
+                /* toggle in this order as per spec */
+                gpio_direction_output(TEGRA_GPIO_WLAN_PWR_LOW, 0);
+                gpio_direction_output(TEGRA_GPIO_WLAN_RST_LOW, 0);
+		udelay(5);
+                gpio_direction_output(TEGRA_GPIO_WLAN_PWR_LOW, 1);
+                gpio_direction_output(TEGRA_GPIO_WLAN_RST_LOW, 1);
+        }
+
+	return 0;
+}
+
+/*
+ * subsys_initcall_sync is good synch point to call harmony_wifi_init
+ * This makes sure that the required regulators (LDO3
+ * supply of external PMU and 1.2V regulator) are properly enabled,
+ * and mmc driver has not yet probed for a device on SDIO bus.
+ */
+subsys_initcall_sync(harmony_wifi_init);
+
 static void __init tegra_harmony_init(void)
 {
 	tegra_common_init();
diff --git a/arch/arm/mach-tegra/board-harmony.h b/arch/arm/mach-tegra/board-harmony.h
index 876ec21eb2e0..c8645ca44338 100644
--- a/arch/arm/mach-tegra/board-harmony.h
+++ b/arch/arm/mach-tegra/board-harmony.h
@@ -17,10 +17,21 @@
 #ifndef _MACH_TEGRA_BOARD_HARMONY_H
 #define _MACH_TEGRA_BOARD_HARMONY_H
 
+#define HARMONY_GPIO_TPS6586X(_x_)      (TEGRA_NR_GPIOS + (_x_))
+/* fixed voltage regulator enable/mode gpios */
+#define TPS_GPIO_EN_1V5                 (HARMONY_GPIO_TPS6586X(0))
+#define TPS_GPIO_EN_1V2                 (HARMONY_GPIO_TPS6586X(1))
+#define TPS_GPIO_EN_1V05                (HARMONY_GPIO_TPS6586X(2))
+#define TPS_GPIO_MODE_1V05              (HARMONY_GPIO_TPS6586X(3))
+
+/* WLAN pwr and reset gpio */
+#define TEGRA_GPIO_WLAN_PWR_LOW         TEGRA_GPIO_PK5
+#define TEGRA_GPIO_WLAN_RST_LOW         TEGRA_GPIO_PK6
+
 void harmony_pinmux_init(void);
 int harmony_panel_init(void);
 int harmony_sdhci_init(void);
-void harmony_regulator_init(void);
+int harmony_regulator_init(void);
 void harmony_power_off_init(void);
 
 #endif