The DA850 supports an optional wl12xx based expansion board, adding WLAN
& BT capabilities. The wl12xx 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.
This patch adds support for the WLAN capabilities of this expansion
board.
Signed-off-by: Ido Yariv <ido@xxxxxxxxxx>
---
arch/arm/mach-davinci/Kconfig | 31 +++++++
arch/arm/mach-davinci/board-da850-evm.c | 128 ++++++++++++++++++++++++++++++
arch/arm/mach-davinci/da850.c | 9 ++
arch/arm/mach-davinci/include/mach/mux.h | 10 +++
4 files changed, 178 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
index c0deaca..1a9149c 100644
--- a/arch/arm/mach-davinci/Kconfig
+++ b/arch/arm/mach-davinci/Kconfig
@@ -192,6 +192,37 @@ config DA850_UI_RMII
endchoice
+config DA850_WL12XX
+ bool "DA850 wl12xx expansion board"
+ depends on MACH_DAVINCI_DA850_EVM
+ ---help---
+ Say Y if you want to use a wl12xx expansion board connected to the
+ DA850 EVM.
+
+choice
+ prompt "FREF reference clock used by the wl12XX expansion board"
+ default DA850_WL12XX_FREF_38_4
+ depends on DA850_WL12XX
+ help
+ There are currently two kinds of such daughter boards, one made by
+ Mistral and another by LS Research. These (and perhaps others) use
+ different FREF reference clocks. Select the correct one according to
+ the daughter board's type.
+
+config DA850_WL12XX_FREF_19_2
+ bool "19.2MHz"
+config DA850_WL12XX_FREF_26
+ bool "26MHz"
+config DA850_WL12XX_FREF_38_4
+ bool "38.4MHz"
+config DA850_WL12XX_FREF_52
+ bool "52MHz"
+config DA850_WL12XX_FREF_XTAL_26
+ bool "XTAL 26MHz"
+config DA850_WL12XX_FREF_XTAL_38_4
+ bool "XTAL 38MHz"
+endchoice
+
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 a7b41bf..a567379 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[] = {
@@ -1117,6 +1122,127 @@ static __init int da850_evm_init_cpufreq(void)
static __init int da850_evm_init_cpufreq(void) { return 0; }
#endif
+#ifdef CONFIG_DA850_WL12XX
+
+static int da850_wl12xx_fref = -1;
+
+static int __init setup_da850_wl12xx_fref(char *fref)
+{
+ if (!strcmp(fref, "19.2"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_19;
+ else if (!strcmp(fref, "26"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_26;
+ else if (!strcmp(fref, "38.4"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_38;
+ else if (!strcmp(fref, "52"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_52;
+ else if (!strcmp(fref, "XTAL26"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_26_XTAL;
+ else if (!strcmp(fref, "XTAL38.4"))
+ da850_wl12xx_fref = WL12XX_REFCLOCK_38_XTAL;
+ else
+ pr_info("da850_wl12xx_fref is invalid. Valid options: "
+ "19.2, 26, 38.4, 52, XTAL26 or XTAL38.4\n");
+ return 0;
+}
+__setup("da850_wl12xx_fref=", setup_da850_wl12xx_fref);
+
+static void wl12xx_set_power(int slot, 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);
+ mdelay(15);
+ gpio_set_value(DA850_WLAN_EN, 0);
+ mdelay(1);
+ gpio_set_value(DA850_WLAN_EN, 1);
+ mdelay(70);
+ } else {
+ gpio_set_value(DA850_WLAN_EN, 0);
+ }
+}
+
+static struct davinci_mmc_config da850_mmc_wl12xx_config = {
+ .get_ro = NULL,
+ .get_cd = NULL,
+ .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_evm_mmc_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,
+#ifdef CONFIG_DA850_WL12XX_FREF_19_2
+ .board_ref_clock = WL12XX_REFCLOCK_19,
+#elif defined CONFIG_DA850_WL12XX_FREF_26
+ .board_ref_clock = WL12XX_REFCLOCK_26,
+#elif defined CONFIG_DA850_WL12XX_FREF_38_4
+ .board_ref_clock = WL12XX_REFCLOCK_38,
+#elif defined CONFIG_DA850_WL12XX_FREF_52
+ .board_ref_clock = WL12XX_REFCLOCK_52,
+#elif defined CONFIG_DA850_WL12XX_FREF_XTAL_26
+ .board_ref_clock = WL12XX_REFCLOCK_26_XTAL,
+#elif defined CONFIG_DA850_WL12XX_FREF_XTAL_38_4
+ .board_ref_clock = WL12XX_REFCLOCK_38_XTAL,
+#endif
+ .platform_quirks = WL12XX_PLATFORM_QUIRK_EDGE_IRQ,
+};
+
+static void da850_wl12xx_init(void)
+{
+ int ret;
+
+ ret = davinci_cfg_reg_list(da850_evm_mmc_wl12xx_pins);
+ if (ret)
+ pr_warning("da850_evm_init: wl12xx/mmc mux setup failed:"
+ " %d\n", ret);
+
+ ret = da850_register_mmcsd1(&da850_mmc_wl12xx_config);
+ if (ret)
+ pr_warning("da850_evm_init: wl12xx/mmc registration failed:"
+ " %d\n", ret);
+
+ if (gpio_request(DA850_WLAN_EN, "wl12xx_en") ||
+ gpio_direction_output(DA850_WLAN_EN, 0))
+ pr_err("Error initializing the wl12xx enable gpio\n");
+
+ if (gpio_request(DA850_WLAN_IRQ, "wl12xx_irq") ||
+ gpio_direction_input(DA850_WLAN_IRQ))
+ pr_err("Error initializing the wl12xx irq gpio\n");
+ else
+ da850_wl12xx_wlan_data.irq = gpio_to_irq(DA850_WLAN_IRQ);
+
+ if (da850_wl12xx_fref != -1)
+ da850_wl12xx_wlan_data.board_ref_clock = da850_wl12xx_fref;
+
+ if (wl12xx_set_platform_data(&da850_wl12xx_wlan_data))
+ pr_err("Error setting wl12xx data\n");
+}
+
+#else /* CONFIG_DA850_WL12XX */
+
+static void da850_wl12xx_init(void) { }
+
+#endif /* CONFIG_DA850_WL12XX */
+
static __init void da850_evm_init(void)
{
int ret;
@@ -1169,6 +1295,8 @@ static __init void da850_evm_init(void)
if (ret)
pr_warning("da850_evm_init: mmcsd0 registration failed:"
" %d\n", ret);
+
+ da850_wl12xx_init();
}
davinci_serial_init(&da850_evm_uart_config);
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 133aac4..bfe9b71 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -525,6 +525,13 @@ static const struct mux_config da850_pins[] = {
MUX_CFG(DA850, MMCSD0_DAT_3, 10, 20, 15, 2, false)
MUX_CFG(DA850, MMCSD0_CLK, 10, 0, 15, 2, false)
MUX_CFG(DA850, MMCSD0_CMD, 10, 4, 15, 2, false)
+ /* MMC/SD1 function */
+ MUX_CFG(DA850, MMCSD1_DAT_0, 18, 8, 15, 2, false)
+ MUX_CFG(DA850, MMCSD1_DAT_1, 19, 16, 15, 2, false)
+ MUX_CFG(DA850, MMCSD1_DAT_2, 19, 12, 15, 2, false)
+ MUX_CFG(DA850, MMCSD1_DAT_3, 19, 8, 15, 2, false)
+ MUX_CFG(DA850, MMCSD1_CLK, 18, 12, 15, 2, false)
+ MUX_CFG(DA850, MMCSD1_CMD, 18, 16, 15, 2, false)
/* EMIF2.5/EMIFA function */
MUX_CFG(DA850, EMA_D_7, 9, 0, 15, 1, false)
MUX_CFG(DA850, EMA_D_6, 9, 4, 15, 1, false)
@@ -583,6 +590,8 @@ static const struct mux_config da850_pins[] = {
MUX_CFG(DA850, GPIO3_13, 7, 8, 15, 8, false)
MUX_CFG(DA850, GPIO4_0, 10, 28, 15, 8, false)
MUX_CFG(DA850, GPIO4_1, 10, 24, 15, 8, false)
+ MUX_CFG(DA850, GPIO6_9, 13, 24, 15, 8, false)
+ MUX_CFG(DA850, GPIO6_10, 13, 20, 15, 8, false)
MUX_CFG(DA850, GPIO6_13, 13, 8, 15, 8, false)
MUX_CFG(DA850, RTC_ALARM, 0, 28, 15, 2, false)
#endif
diff --git a/arch/arm/mach-davinci/include/mach/mux.h b/arch/arm/mach-davinci/include/mach/mux.h
index 5d4e0fe..a7e92fc 100644
--- a/arch/arm/mach-davinci/include/mach/mux.h
+++ b/arch/arm/mach-davinci/include/mach/mux.h
@@ -857,6 +857,14 @@ enum davinci_da850_index {
DA850_MMCSD0_CLK,
DA850_MMCSD0_CMD,
+ /* MMC/SD1 function */
+ DA850_MMCSD1_DAT_0,
+ DA850_MMCSD1_DAT_1,
+ DA850_MMCSD1_DAT_2,
+ DA850_MMCSD1_DAT_3,
+ DA850_MMCSD1_CLK,
+ DA850_MMCSD1_CMD,
+
/* EMIF2.5/EMIFA function */
DA850_EMA_D_7,
DA850_EMA_D_6,
@@ -916,6 +924,8 @@ enum davinci_da850_index {
DA850_GPIO3_13,
DA850_GPIO4_0,
DA850_GPIO4_1,
+ DA850_GPIO6_9,
+ DA850_GPIO6_10,
DA850_GPIO6_13,
DA850_RTC_ALARM,
};
--
1.7.4.1
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