[ARM] pxa/cm-x270: add libertas device registration

v2 changes:
- use gpio_to_irq instead of IRQ_GPIO
- check gpio_direction_output return value to be on the safe side :)

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

1 files changed, 108 insertions, 2 deletions

diff --git a/arch/arm/mach-pxa/cm-x270.c b/arch/arm/mach-pxa/cm-x270.c
index 59292181088c..eea78b6c2bc5 100644
--- a/arch/arm/mach-pxa/cm-x270.c
+++ b/arch/arm/mach-pxa/cm-x270.c
@@ -13,13 +13,18 @@
 #include <linux/sysdev.h>
 #include <linux/irq.h>
 #include <linux/gpio.h>
+#include <linux/delay.h>
 
 #include <linux/rtc-v3020.h>
 #include <video/mbxfb.h>
 
+#include <linux/spi/spi.h>
+#include <linux/spi/libertas_spi.h>
+
 #include <mach/pxa27x.h>
 #include <mach/ohci.h>
 #include <mach/mmc.h>
+#include <mach/pxa2xx_spi.h>
 
 #include "generic.h"
 
@@ -34,6 +39,10 @@
 /* MMC power enable */
 #define GPIO105_MMC_POWER       (105)
 
+/* WLAN GPIOS */
+#define GPIO19_WLAN_STRAP       (19)
+#define GPIO102_WLAN_RST        (102)
+
 static unsigned long cmx270_pin_config[] = {
         /* AC'97 */
         GPIO28_AC97_BITCLK,
@@ -94,8 +103,8 @@ static unsigned long cmx270_pin_config[] = {
         GPIO26_SSP1_RXD,
 
         /* SSP2 */
-        GPIO19_SSP2_SCLK,
-        GPIO14_SSP2_SFRM,
+        GPIO19_GPIO,    /* SSP2 clock is used as GPIO for Libertas pin-strap */
+        GPIO14_GPIO,
         GPIO87_SSP2_TXD,
         GPIO88_SSP2_RXD,
 
@@ -123,6 +132,7 @@ static unsigned long cmx270_pin_config[] = {
         GPIO0_GPIO      | WAKEUP_ON_EDGE_BOTH,
         GPIO105_GPIO    | MFP_LPM_DRIVE_HIGH,   /* MMC/SD power */
         GPIO53_GPIO,                            /* PC card reset */
+        GPIO102_GPIO,                           /* WLAN reset */
 
         /* NAND controls */
         GPIO11_GPIO     | MFP_LPM_DRIVE_HIGH,   /* NAND CE# */
@@ -131,6 +141,7 @@ static unsigned long cmx270_pin_config[] = {
         /* interrupts */
         GPIO10_GPIO,    /* DM9000 interrupt */
         GPIO83_GPIO,    /* MMC card detect */
+        GPIO95_GPIO,    /* WLAN interrupt */
 };
 
 /* V3020 RTC */
@@ -287,6 +298,100 @@ static void __init cmx270_init_mmc(void)
 static inline void cmx270_init_mmc(void) {}
 #endif
 
+#if defined(CONFIG_SPI_PXA2XX) || defined(CONFIG_SPI_PXA2XX_MODULE)
+static struct pxa2xx_spi_master cm_x270_spi_info = {
+        .num_chipselect = 1,
+        .enable_dma     = 1,
+};
+
+static struct pxa2xx_spi_chip cm_x270_libertas_chip = {
+        .rx_threshold   = 1,
+        .tx_threshold   = 1,
+        .timeout        = 1000,
+        .gpio_cs        = 14,
+};
+
+static unsigned long cm_x270_libertas_pin_config[] = {
+        /* SSP2 */
+        GPIO19_SSP2_SCLK,
+        GPIO14_GPIO,
+        GPIO87_SSP2_TXD,
+        GPIO88_SSP2_RXD,
+
+};
+
+static int cm_x270_libertas_setup(struct spi_device *spi)
+{
+        int err = gpio_request(GPIO19_WLAN_STRAP, "WLAN STRAP");
+        if (err)
+                return err;
+
+        err = gpio_request(GPIO102_WLAN_RST, "WLAN RST");
+        if (err)
+                goto err_free_strap;
+
+        err = gpio_direction_output(GPIO102_WLAN_RST, 0);
+        if (err)
+                goto err_free_strap;
+        msleep(100);
+
+        err = gpio_direction_output(GPIO19_WLAN_STRAP, 1);
+        if (err)
+                goto err_free_strap;
+        msleep(100);
+
+        pxa2xx_mfp_config(ARRAY_AND_SIZE(cm_x270_libertas_pin_config));
+
+        gpio_set_value(GPIO102_WLAN_RST, 1);
+        msleep(100);
+
+        spi->bits_per_word = 16;
+        spi_setup(spi);
+
+        return 0;
+
+err_free_strap:
+        gpio_free(GPIO19_WLAN_STRAP);
+
+        return err;
+}
+
+static int cm_x270_libertas_teardown(struct spi_device *spi)
+{
+        gpio_set_value(GPIO102_WLAN_RST, 0);
+        gpio_free(GPIO102_WLAN_RST);
+        gpio_free(GPIO19_WLAN_STRAP);
+
+        return 0;
+}
+
+struct libertas_spi_platform_data cm_x270_libertas_pdata = {
+        .use_dummy_writes       = 1,
+        .setup                  = cm_x270_libertas_setup,
+        .teardown               = cm_x270_libertas_teardown,
+};
+
+static struct spi_board_info cm_x270_spi_devices[] __initdata = {
+        {
+                .modalias               = "libertas_spi",
+                .max_speed_hz           = 13000000,
+                .bus_num                = 2,
+                .irq                    = gpio_to_irq(95),
+                .chip_select            = 0,
+                .controller_data        = &cm_x270_libertas_chip,
+                .platform_data          = &cm_x270_libertas_pdata,
+        },
+};
+
+static void __init cmx270_init_spi(void)
+{
+        pxa2xx_set_spi_info(2, &cm_x270_spi_info);
+        spi_register_board_info(ARRAY_AND_SIZE(cm_x270_spi_devices));
+}
+#else
+static inline void cmx270_init_spi(void) {}
+#endif
+
 void __init cmx270_init(void)
 {
         pxa2xx_mfp_config(ARRAY_AND_SIZE(cmx270_pin_config));
@@ -299,4 +404,5 @@ void __init cmx270_init(void)
         cmx270_init_mmc();
         cmx270_init_ohci();
         cmx270_init_2700G();
+        cmx270_init_spi();
 }