pcmcia: add driver for hx4700

This patch adds support for the HP iPAQ hx4700 to the existing
pxa2xx-pcmcia driver.

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/drivers/pcmcia/pxa2xx_hx4700.c b/drivers/pcmcia/pxa2xx_hx4700.c
new file mode 100644
index 000000000000..7dfef3ee5b53
--- /dev/null
+++ b/drivers/pcmcia/pxa2xx_hx4700.c
@@ -0,0 +1,121 @@
+/*
+ *  Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.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/err.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+
+#include <asm/mach-types.h>
+#include <mach/hx4700.h>
+
+#include "soc_common.h"
+
+static struct gpio gpios[] = {
+	{ GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
+	{ EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
+};
+
+static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	int ret;
+
+	ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
+	if (ret)
+		goto out;
+
+	/*
+	 * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
+	 * The asic3 default IRQ type is level trigger low level detect, exactly
+	 * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
+	 * If the IRQ type is not changed, the asic3 interrupt handler will loop
+	 * repeatedly because it is unable to clear the level trigger interrupt.
+	 */
+	irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);
+
+	skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
+	skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
+	skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
+	skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";
+
+out:
+	return ret;
+}
+
+static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	gpio_free_array(gpios, ARRAY_SIZE(gpios));
+}
+
+static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+	struct pcmcia_state *state)
+{
+	state->vs_3v = 1;
+	state->vs_Xv = 0;
+}
+
+static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+	const socket_state_t *state)
+{
+	switch (state->Vcc) {
+	case 0:
+		gpio_set_value(EGPIO4_CF_3V3_ON, 0);
+		break;
+	case 33:
+		gpio_set_value(EGPIO4_CF_3V3_ON, 1);
+		break;
+	default:
+		printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
+		return -EINVAL;
+	}
+
+	gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);
+
+	return 0;
+}
+
+static struct pcmcia_low_level hx4700_pcmcia_ops = {
+	.owner          = THIS_MODULE,
+	.nr             = 1,
+	.hw_init        = hx4700_pcmcia_hw_init,
+	.hw_shutdown    = hx4700_pcmcia_hw_shutdown,
+	.socket_state   = hx4700_pcmcia_socket_state,
+	.configure_socket = hx4700_pcmcia_configure_socket,
+};
+
+static struct platform_device *hx4700_pcmcia_device;
+
+static int __init hx4700_pcmcia_init(void)
+{
+	struct platform_device *pdev;
+
+	if (!machine_is_h4700())
+		return -ENODEV;
+
+	pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
+		&hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	hx4700_pcmcia_device = pdev;
+
+	return 0;
+}
+
+static void __exit hx4700_pcmcia_exit(void)
+{
+	platform_device_unregister(hx4700_pcmcia_device);
+}
+
+module_init(hx4700_pcmcia_init);
+module_exit(hx4700_pcmcia_exit);
+
+MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
+MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
+MODULE_LICENSE("GPL");