ARM: davinci: AM18x: Add wl1271/wlan support

The wl1271 daughter card for AM18x EVMs is a combo wireless connectivity
add-on card, based on the LS Research TiWi module with Texas
Instruments' wl1271 solution.
It is a 4-wire, 1.8V, embedded SDIO WLAN device with an external IRQ
line and is power-controlled by a GPIO-based fixed regulator.

Add support for the WLAN capabilities of this expansion board.

Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

2 files changed, 124 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index c0deacae778d..32d837d8eab9 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -192,6 +192,16 @@ config DA850_UI_RMII
 
 endchoice
 
+config DA850_WL12XX
+        bool "AM18x wl1271 daughter board"
+        depends on MACH_DAVINCI_DA850_EVM
+        help
+          The wl1271 daughter card for AM18x EVMs is a combo wireless
+          connectivity add-on card, based on the LS Research TiWi module with
+          Texas Instruments' wl1271 solution.
+          Say Y if you want to use a wl1271 expansion card connected to the
+          AM18x EVM.
+
 config GPIO_PCA953X
         default MACH_DAVINCI_DA850_EVM
 
diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
index 008d51407cd7..cb7a1f0b299f 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -31,6 +31,8 @@
 #include <linux/input/tps6507x-ts.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/flash.h>
+#include <linux/delay.h>
+#include <linux/wl12xx.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -49,6 +51,9 @@
 #define DA850_MMCSD_CD_PIN              GPIO_TO_PIN(4, 0)
 #define DA850_MMCSD_WP_PIN              GPIO_TO_PIN(4, 1)
 
+#define DA850_WLAN_EN                   GPIO_TO_PIN(6, 9)
+#define DA850_WLAN_IRQ                  GPIO_TO_PIN(6, 10)
+
 #define DA850_MII_MDIO_CLKEN_PIN        GPIO_TO_PIN(2, 6)
 
 static struct mtd_partition da850evm_spiflash_part[] = {
@@ -1143,6 +1148,110 @@ static __init int da850_evm_init_cpufreq(void)
 static __init int da850_evm_init_cpufreq(void) { return 0; }
 #endif
 
+#ifdef CONFIG_DA850_WL12XX
+
+static void wl12xx_set_power(int index, bool power_on)
+{
+        static bool power_state;
+
+        pr_debug("Powering %s wl12xx", power_on ? "on" : "off");
+
+        if (power_on == power_state)
+                return;
+        power_state = power_on;
+
+        if (power_on) {
+                /* Power up sequence required for wl127x devices */
+                gpio_set_value(DA850_WLAN_EN, 1);
+                usleep_range(15000, 15000);
+                gpio_set_value(DA850_WLAN_EN, 0);
+                usleep_range(1000, 1000);
+                gpio_set_value(DA850_WLAN_EN, 1);
+                msleep(70);
+        } else {
+                gpio_set_value(DA850_WLAN_EN, 0);
+        }
+}
+
+static struct davinci_mmc_config da850_wl12xx_mmc_config = {
+        .set_power      = wl12xx_set_power,
+        .wires          = 4,
+        .max_freq       = 25000000,
+        .caps           = MMC_CAP_4_BIT_DATA | MMC_CAP_NONREMOVABLE |
+                          MMC_CAP_POWER_OFF_CARD,
+        .version        = MMC_CTLR_VERSION_2,
+};
+
+static const short da850_wl12xx_pins[] __initconst = {
+        DA850_MMCSD1_DAT_0, DA850_MMCSD1_DAT_1, DA850_MMCSD1_DAT_2,
+        DA850_MMCSD1_DAT_3, DA850_MMCSD1_CLK, DA850_MMCSD1_CMD,
+        DA850_GPIO6_9, DA850_GPIO6_10,
+        -1
+};
+
+static struct wl12xx_platform_data da850_wl12xx_wlan_data __initdata = {
+        .irq                    = -1,
+        .board_ref_clock        = WL12XX_REFCLOCK_38,
+        .platform_quirks        = WL12XX_PLATFORM_QUIRK_EDGE_IRQ,
+};
+
+static __init int da850_wl12xx_init(void)
+{
+        int ret;
+
+        ret = davinci_cfg_reg_list(da850_wl12xx_pins);
+        if (ret) {
+                pr_err("wl12xx/mmc mux setup failed: %d\n", ret);
+                goto exit;
+        }
+
+        ret = da850_register_mmcsd1(&da850_wl12xx_mmc_config);
+        if (ret) {
+                pr_err("wl12xx/mmc registration failed: %d\n", ret);
+                goto exit;
+        }
+
+        ret = gpio_request_one(DA850_WLAN_EN, GPIOF_OUT_INIT_LOW, "wl12xx_en");
+        if (ret) {
+                pr_err("Could not request wl12xx enable gpio: %d\n", ret);
+                goto exit;
+        }
+
+        ret = gpio_request_one(DA850_WLAN_IRQ, GPIOF_IN, "wl12xx_irq");
+        if (ret) {
+                pr_err("Could not request wl12xx irq gpio: %d\n", ret);
+                goto free_wlan_en;
+        }
+
+        da850_wl12xx_wlan_data.irq = gpio_to_irq(DA850_WLAN_IRQ);
+
+        ret = wl12xx_set_platform_data(&da850_wl12xx_wlan_data);
+        if (ret) {
+                pr_err("Could not set wl12xx data: %d\n", ret);
+                goto free_wlan_irq;
+        }
+
+        return 0;
+
+free_wlan_irq:
+        gpio_free(DA850_WLAN_IRQ);
+
+free_wlan_en:
+        gpio_free(DA850_WLAN_EN);
+
+exit:
+        return ret;
+}
+
+#else /* CONFIG_DA850_WL12XX */
+
+static __init int da850_wl12xx_init(void)
+{
+        return 0;
+}
+
+#endif /* CONFIG_DA850_WL12XX */
+
 #define DA850EVM_SATA_REFCLKPN_RATE     (100 * 1000 * 1000)
 
 static __init void da850_evm_init(void)
@@ -1197,6 +1306,11 @@ static __init void da850_evm_init(void)
                 if (ret)
                         pr_warning("da850_evm_init: mmcsd0 registration failed:"
                                         " %d\n", ret);
+
+                ret = da850_wl12xx_init();
+                if (ret)
+                        pr_warning("da850_evm_init: wl12xx initialization"
+                                   " failed: %d\n", ret);
         }
 
         davinci_serial_init(&da850_evm_uart_config);