MIPS: Alchemy: XXS1500 PCMCIA driver rewrite

Rewritten XXS1500 PCMCIA socket driver, standalone (doesn't depend on
au1000_generic.c) and added carddetect IRQ support.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Linux-PCMCIA <linux-pcmcia@lists.infradead.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 357 insertions, 0 deletions

diff --git a/drivers/pcmcia/xxs1500_ss.c b/drivers/pcmcia/xxs1500_ss.c
new file mode 100644
index 000000000000..4e36930b51ce
--- /dev/null
+++ b/drivers/pcmcia/xxs1500_ss.c
@@ -0,0 +1,357 @@
+/*
+ * PCMCIA socket code for the MyCable XXS1500 system.
+ *
+ * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/resource.h>
+#include <linux/spinlock.h>
+
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/ss.h>
+#include <pcmcia/cistpl.h>
+
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach-au1x00/au1000.h>
+
+#define MEM_MAP_SIZE	0x400000
+#define IO_MAP_SIZE	0x1000
+
+
+/*
+ * 3.3V cards only; all interfacing is done via gpios:
+ *
+ * 0/1:  carddetect (00 = card present, xx = huh)
+ * 4:	 card irq
+ * 204:  reset (high-act)
+ * 205:  buffer enable (low-act)
+ * 208/209: card voltage key (00,01,10,11)
+ * 210:  battwarn
+ * 211:  batdead
+ * 214:  power (low-act)
+ */
+#define GPIO_CDA	0
+#define GPIO_CDB	1
+#define GPIO_CARDIRQ	4
+#define GPIO_RESET	204
+#define GPIO_OUTEN	205
+#define GPIO_VSL	208
+#define GPIO_VSH	209
+#define GPIO_BATTDEAD	210
+#define GPIO_BATTWARN	211
+#define GPIO_POWER	214
+
+struct xxs1500_pcmcia_sock {
+	struct pcmcia_socket	socket;
+	void		*virt_io;
+
+	/* the "pseudo" addresses of the PCMCIA space. */
+	unsigned long	phys_io;
+	unsigned long	phys_attr;
+	unsigned long	phys_mem;
+
+	/* previous flags for set_socket() */
+	unsigned int old_flags;
+};
+
+#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
+
+static irqreturn_t cdirq(int irq, void *data)
+{
+	struct xxs1500_pcmcia_sock *sock = data;
+
+	pcmcia_parse_events(&sock->socket, SS_DETECT);
+
+	return IRQ_HANDLED;
+}
+
+static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
+				    struct socket_state_t *state)
+{
+	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
+	unsigned int changed;
+
+	/* power control */
+	switch (state->Vcc) {
+	case 0:
+		gpio_set_value(GPIO_POWER, 1);	/* power off */
+		break;
+	case 33:
+		gpio_set_value(GPIO_POWER, 0);	/* power on */
+		break;
+	case 50:
+	default:
+		return -EINVAL;
+	}
+
+	changed = state->flags ^ sock->old_flags;
+
+	if (changed & SS_RESET) {
+		if (state->flags & SS_RESET) {
+			gpio_set_value(GPIO_RESET, 1);	/* assert reset */
+			gpio_set_value(GPIO_OUTEN, 1);	/* buffers off */
+		} else {
+			gpio_set_value(GPIO_RESET, 0);	/* deassert reset */
+			gpio_set_value(GPIO_OUTEN, 0);	/* buffers on */
+			msleep(500);
+		}
+	}
+
+	sock->old_flags = state->flags;
+
+	return 0;
+}
+
+static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
+				     unsigned int *value)
+{
+	unsigned int status;
+	int i;
+
+	status = 0;
+
+	/* check carddetects: GPIO[0:1] must both be low */
+	if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
+		status |= SS_DETECT;
+
+	/* determine card voltage: GPIO[208:209] binary value */
+	i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
+
+	switch (i) {
+	case 0:
+	case 1:
+	case 2:
+		status |= SS_3VCARD;	/* 3V card */
+		break;
+	case 3:				/* 5V card, unsupported */
+	default:
+		status |= SS_XVCARD;	/* treated as unsupported in core */
+	}
+
+	/* GPIO214: low active power switch */
+	status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
+
+	/* GPIO204: high-active reset line */
+	status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
+
+	/* other stuff */
+	status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
+	status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
+
+	*value = status;
+
+	return 0;
+}
+
+static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
+{
+	gpio_direction_input(GPIO_CDA);
+	gpio_direction_input(GPIO_CDB);
+	gpio_direction_input(GPIO_VSL);
+	gpio_direction_input(GPIO_VSH);
+	gpio_direction_input(GPIO_BATTDEAD);
+	gpio_direction_input(GPIO_BATTWARN);
+	gpio_direction_output(GPIO_RESET, 1);	/* assert reset */
+	gpio_direction_output(GPIO_OUTEN, 1);	/* disable buffers */
+	gpio_direction_output(GPIO_POWER, 1);	/* power off */
+
+	return 0;
+}
+
+static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
+{
+	return 0;
+}
+
+static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
+				    struct pccard_io_map *map)
+{
+	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
+
+	map->start = (u32)sock->virt_io;
+	map->stop = map->start + IO_MAP_SIZE;
+
+	return 0;
+}
+
+static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
+				     struct pccard_mem_map *map)
+{
+	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
+
+	if (map->flags & MAP_ATTRIB)
+		map->static_start = sock->phys_attr + map->card_start;
+	else
+		map->static_start = sock->phys_mem + map->card_start;
+
+	return 0;
+}
+
+static struct pccard_operations xxs1500_pcmcia_operations = {
+	.init			= xxs1500_pcmcia_sock_init,
+	.suspend		= xxs1500_pcmcia_sock_suspend,
+	.get_status		= xxs1500_pcmcia_get_status,
+	.set_socket		= xxs1500_pcmcia_configure,
+	.set_io_map		= au1x00_pcmcia_set_io_map,
+	.set_mem_map		= au1x00_pcmcia_set_mem_map,
+};
+
+static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev)
+{
+	struct xxs1500_pcmcia_sock *sock;
+	struct resource *r;
+	phys_t physio;
+	int ret, irq;
+
+	sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
+	if (!sock)
+		return -ENOMEM;
+
+	ret = -ENODEV;
+
+	/*
+	 * pseudo-attr:  The 32bit address of the PCMCIA attribute space
+	 * for this socket (usually the 36bit address shifted 4 to the
+	 * right).
+	 */
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pseudo-attr");
+	if (!r) {
+		dev_err(&pdev->dev, "missing 'pseudo-attr' resource!\n");
+		goto out0;
+	}
+	sock->phys_attr = r->start;
+
+	/*
+	 * pseudo-mem:  The 32bit address of the PCMCIA memory space for
+	 * this socket (usually the 36bit address shifted 4 to the right)
+	 */
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pseudo-mem");
+	if (!r) {
+		dev_err(&pdev->dev, "missing 'pseudo-mem' resource!\n");
+		goto out0;
+	}
+	sock->phys_mem = r->start;
+
+	/*
+	 * pseudo-io:  The 32bit address of the PCMCIA IO space for this
+	 * socket (usually the 36bit address shifted 4 to the right).
+	 */
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pseudo-io");
+	if (!r) {
+		dev_err(&pdev->dev, "missing 'pseudo-io' resource!\n");
+		goto out0;
+	}
+	sock->phys_io = r->start;
+
+
+	/* for io must remap the full 36bit address (for reference see
+	 * alchemy/common/setup.c::__fixup_bigphys_addr)
+	 */
+	physio = ((phys_t)sock->phys_io) << 4;
+
+	/*
+	 * PCMCIA client drivers use the inb/outb macros to access
+	 * the IO registers.  Since mips_io_port_base is added
+	 * to the access address of the mips implementation of
+	 * inb/outb, we need to subtract it here because we want
+	 * to access the I/O or MEM address directly, without
+	 * going through this "mips_io_port_base" mechanism.
+	 */
+	sock->virt_io = (void *)(ioremap(physio, IO_MAP_SIZE) -
+				 mips_io_port_base);
+
+	if (!sock->virt_io) {
+		dev_err(&pdev->dev, "cannot remap IO area\n");
+		ret = -ENOMEM;
+		goto out0;
+	}
+
+	sock->socket.ops	= &xxs1500_pcmcia_operations;
+	sock->socket.owner	= THIS_MODULE;
+	sock->socket.pci_irq	= gpio_to_irq(GPIO_CARDIRQ);
+	sock->socket.features	= SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
+	sock->socket.map_size	= MEM_MAP_SIZE;
+	sock->socket.io_offset	= (unsigned long)sock->virt_io;
+	sock->socket.dev.parent	= &pdev->dev;
+	sock->socket.resource_ops = &pccard_static_ops;
+
+	platform_set_drvdata(pdev, sock);
+
+	/* setup carddetect irq: use one of the 2 GPIOs as an
+	 * edge detector.
+	 */
+	irq = gpio_to_irq(GPIO_CDA);
+	set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
+	ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot setup cd irq\n");
+		goto out1;
+	}
+
+	ret = pcmcia_register_socket(&sock->socket);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register\n");
+		goto out2;
+	}
+
+	printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
+
+	return 0;
+
+out2:
+	free_irq(gpio_to_irq(GPIO_CDA), sock);
+out1:
+	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
+out0:
+	kfree(sock);
+	return ret;
+}
+
+static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev)
+{
+	struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
+
+	pcmcia_unregister_socket(&sock->socket);
+	free_irq(gpio_to_irq(GPIO_CDA), sock);
+	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
+	kfree(sock);
+
+	return 0;
+}
+
+static struct platform_driver xxs1500_pcmcia_socket_driver = {
+	.driver	= {
+		.name	= "xxs1500_pcmcia",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= xxs1500_pcmcia_probe,
+	.remove		= __devexit_p(xxs1500_pcmcia_remove),
+};
+
+int __init xxs1500_pcmcia_socket_load(void)
+{
+	return platform_driver_register(&xxs1500_pcmcia_socket_driver);
+}
+
+void  __exit xxs1500_pcmcia_socket_unload(void)
+{
+	platform_driver_unregister(&xxs1500_pcmcia_socket_driver);
+}
+
+module_init(xxs1500_pcmcia_socket_load);
+module_exit(xxs1500_pcmcia_socket_unload);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
+MODULE_AUTHOR("Manuel Lauss");