| Message ID | 1311886373-3060-1-git-send-email-ido@wizery.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 7/28/2011 1:52 PM, Ido Yariv wrote: > 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> > --- > arch/arm/mach-davinci/Kconfig | 10 +++ > arch/arm/mach-davinci/board-da850-evm.c | 114 +++++++++++++++++++++++++++++++ > 2 files changed, 124 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig > index c0deaca..32d837d 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 bd53945..d817626 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 +1122,110 @@ 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); Why turn on, then off, and then back on? Isn't off, then back on sufficient? Also, why not use regulator API like panda board does? From board-omap4panda.c, we have
Hi Troy, On Thu, Jul 28, 2011 at 02:15:41PM -0700, Troy Kisky wrote: > > + 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); > > Why turn on, then off, and then back on? > Isn't off, then back on sufficient? Unfortunately, no. This is a required power up sequence for some hardware revisions of the 1271 chip. > Also, why not use regulator API like panda board does? Unlike omap_hsmmc, davinci's MMC host driver does not toggle any regulators. To keep things simple, a set_power callback function was added to the mmc host as part of this patch series. I've considered adding regulator support instead, but found it to be a bit over-complicated for this task. In addition, it would require either modifying the fixed regulator or adding a new one in order to support the above power sequence. Thanks for your review, Ido.
On 7/28/2011 3:06 PM, Ido Yariv wrote: > Hi Troy, > > On Thu, Jul 28, 2011 at 02:15:41PM -0700, Troy Kisky wrote: >>> + 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); >> >> Why turn on, then off, and then back on? >> Isn't off, then back on sufficient? > > Unfortunately, no. This is a required power up sequence for some > hardware revisions of the 1271 chip. That's too bad. > >> Also, why not use regulator API like panda board does? > > Unlike omap_hsmmc, davinci's MMC host driver does not toggle any > regulators. To keep things simple, a set_power callback function was > added to the mmc host as part of this patch series. > I've considered adding regulator support instead, but found it to be > a bit over-complicated for this task. In addition, it would require > either modifying the fixed regulator or adding a new one in order to > support the above power sequence. Yes, that is more effort. I'm fine with your method, but with all the consolidation effort that's being expended currently, it would be nice if all boards could use a common method to power up sdio cards. It might make a device tree implementation for this driver easier too, though I am certainly no expert there. > > Thanks for your review, > Ido. > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
Hi Ido, On Fri, Jul 29, 2011 at 02:22:53, Ido Yariv wrote: > 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> Can you please rebase this patch to master branch of my tree[1] and repost. It doesn't apply at the moment. Also, when you repost, please change the subject to "ARM: davinci: AM18x: Add wl1271/wlan support" so that it is consistent with other patches. Thanks, Sekhar [1] git://gitorious.org/linux-davinci/linux-davinci.git
diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig index c0deaca..32d837d 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 bd53945..d817626 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 +1122,110 @@ 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) @@ -1171,6 +1280,11 @@ 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);
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> --- arch/arm/mach-davinci/Kconfig | 10 +++ arch/arm/mach-davinci/board-da850-evm.c | 114 +++++++++++++++++++++++++++++++ 2 files changed, 124 insertions(+), 0 deletions(-)