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");