[ARM] pxa: Palm Tungsten|C PCMCIA support

This patch adds support for PCMCIA socket found in Palm Tungsten|C.
There is Prism3 based WiFi card hardwired to that socket.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

2 files changed, 231 insertions, 0 deletions

diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile
index 047394d98ac2..3247828aa203 100644
--- a/drivers/pcmcia/Makefile
+++ b/drivers/pcmcia/Makefile
@@ -71,6 +71,7 @@ pxa2xx-obj-$(CONFIG_MACH_ARMCORE)		+= pxa2xx_cm_x2xx_cs.o
 pxa2xx-obj-$(CONFIG_ARCH_VIPER)                 += pxa2xx_viper.o
 pxa2xx-obj-$(CONFIG_TRIZEPS_PCMCIA)             += pxa2xx_trizeps4.o
 pxa2xx-obj-$(CONFIG_MACH_PALMTX)                += pxa2xx_palmtx.o
+pxa2xx-obj-$(CONFIG_MACH_PALMTC)                += pxa2xx_palmtc.o
 pxa2xx-obj-$(CONFIG_MACH_PALMLD)                += pxa2xx_palmld.o
 pxa2xx-obj-$(CONFIG_MACH_E740)                  += pxa2xx_e740.o
 pxa2xx-obj-$(CONFIG_MACH_STARGATE2)             += pxa2xx_stargate2.o
diff --git a/drivers/pcmcia/pxa2xx_palmtc.c b/drivers/pcmcia/pxa2xx_palmtc.c
new file mode 100644
index 000000000000..2c295078032a
--- /dev/null
+++ b/drivers/pcmcia/pxa2xx_palmtc.c
@@ -0,0 +1,230 @@
+/*
+ * linux/drivers/pcmcia/pxa2xx_palmtc.c
+ *
+ * Driver for Palm Tungsten|C PCMCIA
+ *
+ * Copyright (C) 2008 Alex Osborne <ato@meshy.org>
+ * Copyright (C) 2009 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+
+#include <asm/mach-types.h>
+#include <mach/palmtc.h>
+#include "soc_common.h"
+
+static int palmtc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+        int ret;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_POWER1, "PCMCIA PWR1");
+        if (ret)
+                goto err1;
+        ret = gpio_direction_output(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
+        if (ret)
+                goto err2;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_POWER2, "PCMCIA PWR2");
+        if (ret)
+                goto err2;
+        ret = gpio_direction_output(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
+        if (ret)
+                goto err3;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_POWER3, "PCMCIA PWR3");
+        if (ret)
+                goto err3;
+        ret = gpio_direction_output(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
+        if (ret)
+                goto err4;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_RESET, "PCMCIA RST");
+        if (ret)
+                goto err4;
+        ret = gpio_direction_output(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
+        if (ret)
+                goto err5;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_READY, "PCMCIA RDY");
+        if (ret)
+                goto err5;
+        ret = gpio_direction_input(GPIO_NR_PALMTC_PCMCIA_READY);
+        if (ret)
+                goto err6;
+
+        ret = gpio_request(GPIO_NR_PALMTC_PCMCIA_PWRREADY, "PCMCIA PWRRDY");
+        if (ret)
+                goto err6;
+        ret = gpio_direction_input(GPIO_NR_PALMTC_PCMCIA_PWRREADY);
+        if (ret)
+                goto err7;
+
+        skt->irq = IRQ_GPIO(GPIO_NR_PALMTC_PCMCIA_READY);
+        return 0;
+
+err7:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_PWRREADY);
+err6:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_READY);
+err5:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_RESET);
+err4:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER3);
+err3:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER2);
+err2:
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER1);
+err1:
+        return ret;
+}
+
+static void palmtc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_PWRREADY);
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_READY);
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_RESET);
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER3);
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER2);
+        gpio_free(GPIO_NR_PALMTC_PCMCIA_POWER1);
+}
+
+static void palmtc_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+                                        struct pcmcia_state *state)
+{
+        state->detect = 1; /* always inserted */
+        state->ready  = !!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_READY);
+        state->bvd1   = 1;
+        state->bvd2   = 1;
+        state->wrprot = 0;
+        state->vs_3v  = 1;
+        state->vs_Xv  = 0;
+}
+
+static int palmtc_wifi_powerdown(void)
+{
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 0);
+        mdelay(40);
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 0);
+        return 0;
+}
+
+static int palmtc_wifi_powerup(void)
+{
+        int timeout = 50;
+
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 1);
+        mdelay(50);
+
+        /* Power up the card, 1.8V first, after a while 3.3V */
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER1, 1);
+        mdelay(100);
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER2, 1);
+
+        /* Wait till the card is ready */
+        while (!gpio_get_value(GPIO_NR_PALMTC_PCMCIA_PWRREADY) &&
+                timeout) {
+                mdelay(1);
+                timeout--;
+        }
+
+        /* Power down the WiFi in case of error */
+        if (!timeout) {
+                palmtc_wifi_powerdown();
+                return 1;
+        }
+
+        /* Reset the card */
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 1);
+        mdelay(20);
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_RESET, 0);
+        mdelay(25);
+
+        gpio_set_value(GPIO_NR_PALMTC_PCMCIA_POWER3, 0);
+
+        return 0;
+}
+
+static int palmtc_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+                                        const socket_state_t *state)
+{
+        int ret;
+
+        if (state->Vcc == 0)
+                ret = palmtc_wifi_powerdown();
+        else if (state->Vcc == 33)
+                ret = palmtc_wifi_powerup();
+
+        return ret;
+}
+
+static void palmtc_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
+{
+}
+
+static void palmtc_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
+{
+}
+
+static struct pcmcia_low_level palmtc_pcmcia_ops = {
+        .owner                  = THIS_MODULE,
+
+        .first                  = 0,
+        .nr                     = 1,
+
+        .hw_init                = palmtc_pcmcia_hw_init,
+        .hw_shutdown            = palmtc_pcmcia_hw_shutdown,
+
+        .socket_state           = palmtc_pcmcia_socket_state,
+        .configure_socket       = palmtc_pcmcia_configure_socket,
+
+        .socket_init            = palmtc_pcmcia_socket_init,
+        .socket_suspend         = palmtc_pcmcia_socket_suspend,
+};
+
+static struct platform_device *palmtc_pcmcia_device;
+
+static int __init palmtc_pcmcia_init(void)
+{
+        int ret;
+
+        if (!machine_is_palmtc())
+                return -ENODEV;
+
+        palmtc_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
+        if (!palmtc_pcmcia_device)
+                return -ENOMEM;
+
+        ret = platform_device_add_data(palmtc_pcmcia_device, &palmtc_pcmcia_ops,
+                                        sizeof(palmtc_pcmcia_ops));
+
+        if (!ret)
+                ret = platform_device_add(palmtc_pcmcia_device);
+
+        if (ret)
+                platform_device_put(palmtc_pcmcia_device);
+
+        return ret;
+}
+
+static void __exit palmtc_pcmcia_exit(void)
+{
+        platform_device_unregister(palmtc_pcmcia_device);
+}
+
+module_init(palmtc_pcmcia_init);
+module_exit(palmtc_pcmcia_exit);
+
+MODULE_AUTHOR("Alex Osborne <ato@meshy.org>,"
+            " Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("PCMCIA support for Palm Tungsten|C");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");
+MODULE_LICENSE("GPL");