[PATCH v5 1/2] pxa/hx4700: Add PCMCIA/CF support

Paul Parsons lost.distance at yahoo.com
Sat Feb 4 08:43:52 EST 2012


Add PCMCIA/CF support for the HP iPAQ hx4700. Underlying support is provided by
the pcmcia/pxa2xx_hx4700 platform_device implementation which hooks into the
existing pxa2xx-pcmcia driver.

Signed-off-by: Paul Parsons <lost.distance at yahoo.com>
---

V5:
Added comment explaining why irq_set_irq_type() needs to be called.
Removed 5 lines of now duplicate initialization.
Replaced 3 platform_device_*() calls with platform_device_register_data().
Prefixed static function names with "hx4700_pcmcia_".

diff -uprN clean-3.3-rc2/drivers/mfd/asic3.c linux-3.3-rc2/drivers/mfd/asic3.c
--- clean-3.3-rc2/drivers/mfd/asic3.c	2012-01-31 21:31:54.000000000 +0000
+++ linux-3.3-rc2/drivers/mfd/asic3.c	2012-02-04 13:18:55.170485871 +0000
@@ -992,6 +992,9 @@ static int __init asic3_probe(struct pla
 
 	asic3_mfd_probe(pdev, pdata, mem);
 
+	asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
+		(ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 1);
+
 	dev_info(asic->dev, "ASIC3 Core driver\n");
 
 	return 0;
@@ -1013,6 +1016,9 @@ static int __devexit asic3_remove(struct
 	int ret;
 	struct asic3 *asic = platform_get_drvdata(pdev);
 
+	asic3_set_register(asic, ASIC3_OFFSET(EXTCF, SELECT),
+		(ASIC3_EXTCF_CF0_BUF_EN|ASIC3_EXTCF_CF0_PWAIT_EN), 0);
+
 	asic3_mfd_remove(pdev);
 
 	ret = asic3_gpio_remove(pdev);
diff -uprN clean-3.3-rc2/drivers/pcmcia/Kconfig linux-3.3-rc2/drivers/pcmcia/Kconfig
--- clean-3.3-rc2/drivers/pcmcia/Kconfig	2012-02-04 01:10:54.215948545 +0000
+++ linux-3.3-rc2/drivers/pcmcia/Kconfig	2012-02-04 13:18:55.170485871 +0000
@@ -217,7 +217,7 @@ config PCMCIA_PXA2XX
 		    || MACH_ARMCORE || ARCH_PXA_PALM || TRIZEPS_PCMCIA \
 		    || ARCOM_PCMCIA || ARCH_PXA_ESERIES || MACH_STARGATE2 \
 		    || MACH_VPAC270 || MACH_BALLOON3 || MACH_COLIBRI \
-		    || MACH_COLIBRI320)
+		    || MACH_COLIBRI320 || MACH_H4700)
 	select PCMCIA_SA1111 if ARCH_LUBBOCK && SA1111
 	select PCMCIA_SOC_COMMON
 	help
diff -uprN clean-3.3-rc2/drivers/pcmcia/Makefile linux-3.3-rc2/drivers/pcmcia/Makefile
--- clean-3.3-rc2/drivers/pcmcia/Makefile	2012-02-04 01:10:54.255948804 +0000
+++ linux-3.3-rc2/drivers/pcmcia/Makefile	2012-02-04 13:18:55.170485871 +0000
@@ -69,6 +69,7 @@ pxa2xx-obj-$(CONFIG_MACH_VPAC270)		+= px
 pxa2xx-obj-$(CONFIG_MACH_BALLOON3)		+= pxa2xx_balloon3.o
 pxa2xx-obj-$(CONFIG_MACH_COLIBRI)		+= pxa2xx_colibri.o
 pxa2xx-obj-$(CONFIG_MACH_COLIBRI320)		+= pxa2xx_colibri.o
+pxa2xx-obj-$(CONFIG_MACH_H4700)			+= pxa2xx_hx4700.o
 
 obj-$(CONFIG_PCMCIA_PXA2XX)			+= pxa2xx_base.o $(pxa2xx-obj-y)
 
diff -uprN clean-3.3-rc2/drivers/pcmcia/pxa2xx_hx4700.c linux-3.3-rc2/drivers/pcmcia/pxa2xx_hx4700.c
--- clean-3.3-rc2/drivers/pcmcia/pxa2xx_hx4700.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-3.3-rc2/drivers/pcmcia/pxa2xx_hx4700.c	2012-02-04 13:38:29.449060803 +0000
@@ -0,0 +1,121 @@
+/*
+ *  Copyright (C) 2012 Paul Parsons <lost.distance at 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 asci3 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 at yahoo.com>");
+MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
+MODULE_LICENSE("GPL");




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