[ARM] pxa/balloon3: PCMCIA Support

This driver adds support for the on-board CF socket.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/pcmcia/pxa2xx_balloon3.c b/drivers/pcmcia/pxa2xx_balloon3.c
new file mode 100644
index 000000000000..dbbdd0063202
--- /dev/null
+++ b/drivers/pcmcia/pxa2xx_balloon3.c
@@ -0,0 +1,158 @@
+/*
+ * linux/drivers/pcmcia/pxa2xx_balloon3.c
+ *
+ * Balloon3 PCMCIA specific routines.
+ *
+ *  Author:	Nick Bane
+ *  Created:	June, 2006
+ *  Copyright:	Toby Churchill Ltd
+ *  Derived from pxa2xx_mainstone.c, by Nico Pitre
+ *
+ * Various modification by 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/gpio.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/balloon3.h>
+
+#include "soc_common.h"
+
+/*
+ * These are a list of interrupt sources that provokes a polled
+ * check of status
+ */
+static struct pcmcia_irqs irqs[] = {
+	{ 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
+	{ 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
+};
+
+static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	uint16_t ver;
+	int ret;
+	static void __iomem *fpga_ver;
+
+	ver = __raw_readw(BALLOON3_FPGA_VER);
+	if (ver > 0x0201)
+		pr_warn("The FPGA code, version 0x%04x, is newer than rel-0.3. "
+			"PCMCIA/CF support might be broken in this version!",
+			ver);
+
+	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
+	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
+}
+
+static unsigned long balloon3_pcmcia_status[2] = {
+	BALLOON3_CF_nSTSCHG_BVD1,
+	BALLOON3_CF_nSTSCHG_BVD1
+};
+
+static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
+				    struct pcmcia_state *state)
+{
+	uint16_t status;
+	int flip;
+
+	/* This actually reads the STATUS register */
+	status = __raw_readw(BALLOON3_CF_STATUS_REG);
+	flip = (status ^ balloon3_pcmcia_status[skt->nr])
+		& BALLOON3_CF_nSTSCHG_BVD1;
+	/*
+	 * Workaround for STSCHG which can't be deasserted:
+	 * We therefore disable/enable corresponding IRQs
+	 * as needed to avoid IRQ locks.
+	 */
+	if (flip) {
+		balloon3_pcmcia_status[skt->nr] = status;
+		if (status & BALLOON3_CF_nSTSCHG_BVD1)
+			enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
+		else
+			disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
+	}
+
+	state->detect	= !gpio_get_value(BALLOON3_GPIO_S0_CD);
+	state->ready	= !!(status & BALLOON3_CF_nIRQ);
+	state->bvd1	= !!(status & BALLOON3_CF_nSTSCHG_BVD1);
+	state->bvd2	= 0;	/* not available */
+	state->vs_3v	= 1;	/* Always true its a CF card */
+	state->vs_Xv	= 0;	/* not available */
+	state->wrprot	= 0;	/* not available */
+}
+
+static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
+				       const socket_state_t *state)
+{
+	__raw_writew((state->flags & SS_RESET) ? BALLOON3_CF_RESET : 0,
+			BALLOON3_CF_CONTROL_REG);
+	return 0;
+}
+
+static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
+{
+}
+
+static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
+{
+}
+
+static struct pcmcia_low_level balloon3_pcmcia_ops = {
+	.owner			= THIS_MODULE,
+	.hw_init		= balloon3_pcmcia_hw_init,
+	.hw_shutdown		= balloon3_pcmcia_hw_shutdown,
+	.socket_state		= balloon3_pcmcia_socket_state,
+	.configure_socket	= balloon3_pcmcia_configure_socket,
+	.socket_init		= balloon3_pcmcia_socket_init,
+	.socket_suspend		= balloon3_pcmcia_socket_suspend,
+	.first			= 0,
+	.nr			= 1,
+};
+
+static struct platform_device *balloon3_pcmcia_device;
+
+static int __init balloon3_pcmcia_init(void)
+{
+	int ret;
+
+	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
+	if (!balloon3_pcmcia_device)
+		return -ENOMEM;
+
+	ret = platform_device_add_data(balloon3_pcmcia_device,
+			&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
+
+	if (!ret)
+		ret = platform_device_add(balloon3_pcmcia_device);
+
+	if (ret)
+		platform_device_put(balloon3_pcmcia_device);
+
+	return ret;
+}
+
+static void __exit balloon3_pcmcia_exit(void)
+{
+	platform_device_unregister(balloon3_pcmcia_device);
+}
+
+module_init(balloon3_pcmcia_init);
+module_exit(balloon3_pcmcia_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");
+MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");