[ARM] pxa/stargate2: add support for Compact Flash/PCMCIA

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/drivers/pcmcia/pxa2xx_stargate2.c b/drivers/pcmcia/pxa2xx_stargate2.c
new file mode 100644
index 000000000000..490749ea677f
--- /dev/null
+++ b/drivers/pcmcia/pxa2xx_stargate2.c
@@ -0,0 +1,174 @@
+/*
+ * linux/drivers/pcmcia/pxa2xx_stargate2.c
+ *
+ * Stargate 2 PCMCIA specific routines.
+ *
+ * Created:	December 6, 2005
+ * Author:	Ed C. Epp
+ * Copyright:	Intel Corp 2005
+ *              Jonathan Cameron <jic23@cam.ac.uk> 2009
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <pcmcia/ss.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include "soc_common.h"
+
+#define SG2_S0_BUFF_CTL		120
+#define SG2_S0_POWER_CTL	108
+#define SG2_S0_GPIO_RESET	82
+#define SG2_S0_GPIO_DETECT	53
+#define SG2_S0_GPIO_READY	81
+
+static struct pcmcia_irqs irqs[] = {
+	{ 0, IRQ_GPIO(SG2_S0_GPIO_DETECT), "PCMCIA0 CD" },
+};
+
+static int sg2_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	skt->irq = IRQ_GPIO(SG2_S0_GPIO_READY);
+	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static void sg2_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static void sg2_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+				    struct pcmcia_state *state)
+{
+	state->detect = !gpio_get_value(SG2_S0_GPIO_DETECT);
+	state->ready  = !!gpio_get_value(SG2_S0_GPIO_READY);
+	state->bvd1   = 0; /* not available - battery detect on card */
+	state->bvd2   = 0; /* not available */
+	state->vs_3v  = 1; /* not available - voltage detect for card */
+	state->vs_Xv  = 0; /* not available */
+	state->wrprot = 0; /* not available - write protect */
+}
+
+static int sg2_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+				       const socket_state_t *state)
+{
+	/* Enable card power */
+	switch (state->Vcc) {
+	case 0:
+		/* sets power ctl register high */
+		gpio_set_value(SG2_S0_POWER_CTL, 1);
+		break;
+	case 33:
+	case 50:
+		/* sets power control register low (clear) */
+		gpio_set_value(SG2_S0_POWER_CTL, 0);
+		msleep(100);
+		break;
+	default:
+		pr_err("%s(): bad Vcc %u\n",
+		       __func__, state->Vcc);
+		return -1;
+	}
+
+	/* reset */
+	gpio_set_value(SG2_S0_GPIO_RESET, !!(state->flags & SS_RESET));
+
+	return 0;
+}
+
+static void sg2_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
+{
+	soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static void sg2_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
+{
+	soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static struct pcmcia_low_level sg2_pcmcia_ops __initdata = {
+	.owner			= THIS_MODULE,
+	.hw_init		= sg2_pcmcia_hw_init,
+	.hw_shutdown		= sg2_pcmcia_hw_shutdown,
+	.socket_state		= sg2_pcmcia_socket_state,
+	.configure_socket	= sg2_pcmcia_configure_socket,
+	.socket_init		= sg2_pcmcia_socket_init,
+	.socket_suspend		= sg2_pcmcia_socket_suspend,
+	.nr			= 1,
+};
+
+static struct platform_device *sg2_pcmcia_device;
+
+static int __init sg2_pcmcia_init(void)
+{
+	int ret;
+
+	if (!machine_is_stargate2())
+		return -ENODEV;
+
+	sg2_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
+	if (!sg2_pcmcia_device)
+		return -ENOMEM;
+
+	ret = gpio_request(SG2_S0_BUFF_CTL, "SG2 CF buff ctl");
+	if (ret)
+		goto error_put_platform_device;
+	ret = gpio_request(SG2_S0_POWER_CTL, "SG2 CF power ctl");
+	if (ret)
+		goto error_free_gpio_buff_ctl;
+	ret = gpio_request(SG2_S0_GPIO_RESET, "SG2 CF reset");
+	if (ret)
+		goto error_free_gpio_power_ctl;
+	/* Set gpio directions */
+	gpio_direction_output(SG2_S0_BUFF_CTL, 0);
+	gpio_direction_output(SG2_S0_POWER_CTL, 1);
+	gpio_direction_output(SG2_S0_GPIO_RESET, 1);
+
+	ret = platform_device_add_data(sg2_pcmcia_device,
+				       &sg2_pcmcia_ops,
+				       sizeof(sg2_pcmcia_ops));
+	if (ret)
+		goto error_free_gpio_reset;
+
+	ret = platform_device_add(sg2_pcmcia_device);
+	if (ret)
+		goto error_free_gpio_reset;
+
+	return 0;
+error_free_gpio_reset:
+	gpio_free(SG2_S0_GPIO_RESET);
+error_free_gpio_power_ctl:
+	gpio_free(SG2_S0_POWER_CTL);
+error_free_gpio_buff_ctl:
+	gpio_free(SG2_S0_BUFF_CTL);
+error_put_platform_device:
+	platform_device_put(sg2_pcmcia_device);
+
+	return ret;
+}
+
+static void __exit sg2_pcmcia_exit(void)
+{
+	platform_device_unregister(sg2_pcmcia_device);
+	gpio_free(SG2_S0_BUFF_CTL);
+	gpio_free(SG2_S0_POWER_CTL);
+	gpio_free(SG2_S0_GPIO_RESET);
+}
+
+fs_initcall(sg2_pcmcia_init);
+module_exit(sg2_pcmcia_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");