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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>
This commit is contained in:
Ido Yariv 2011-08-04 10:51:23 +03:00 committed by Sekhar Nori
parent 4a9de8ad2c
commit ab3f5c1fc2
2 changed files with 124 additions and 0 deletions
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10
arch/arm/mach-davinci/Kconfig
View File

@ -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

114
arch/arm/mach-davinci/board-da850-evm.c
View File

@ -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);