pcmcia: CompactFlash driver for PA Semi Electra boards

Driver for the CompactFlash slot on the PA Semi Electra eval board. It's
a simple device sitting on localbus, with interrupts and detect/voltage
control over GPIO.

The driver is implemented as an of_platform driver, and adds localbus
as a bus being probed by the of_platform framework.

[akpm@linux-foundation.org: cleanups]
[olof@lixom.net: fix build]
Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Milton Miller <miltonm@bga.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 377 insertions, 0 deletions

diff --git a/drivers/pcmcia/electra_cf.c b/drivers/pcmcia/electra_cf.c
new file mode 100644
index 000000000000..0a6cea1316b4
--- /dev/null
+++ b/drivers/pcmcia/electra_cf.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright (C) 2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom.net>
+ *
+ * Based on drivers/pcmcia/omap_cf.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/vmalloc.h>
+
+#include <pcmcia/ss.h>
+#include <asm/of_platform.h>
+
+static const char driver_name[] = "electra-cf";
+
+struct electra_cf_socket {
+        struct pcmcia_socket    socket;
+
+        struct timer_list       timer;
+        unsigned                present:1;
+        unsigned                active:1;
+
+        struct of_device        *ofdev;
+        unsigned long           mem_phys;
+        void __iomem *          mem_base;
+        unsigned long           mem_size;
+        void __iomem *          io_virt;
+        unsigned int            io_base;
+        unsigned int            io_size;
+        u_int                   irq;
+        struct resource         iomem;
+        void __iomem *          gpio_base;
+        int                     gpio_detect;
+        int                     gpio_vsense;
+        int                     gpio_3v;
+        int                     gpio_5v;
+};
+
+#define POLL_INTERVAL           (2 * HZ)
+
+
+static int electra_cf_present(struct electra_cf_socket *cf)
+{
+        unsigned int gpio;
+
+        gpio = in_le32(cf->gpio_base+0x40);
+        return !(gpio & (1 << cf->gpio_detect));
+}
+
+static int electra_cf_ss_init(struct pcmcia_socket *s)
+{
+        return 0;
+}
+
+/* the timer is primarily to kick this socket's pccardd */
+static void electra_cf_timer(unsigned long _cf)
+{
+        struct electra_cf_socket *cf = (void *) _cf;
+        int present = electra_cf_present(cf);
+
+        if (present != cf->present) {
+                cf->present = present;
+                pcmcia_parse_events(&cf->socket, SS_DETECT);
+        }
+
+        if (cf->active)
+                mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
+}
+
+static irqreturn_t electra_cf_irq(int irq, void *_cf)
+{
+        electra_cf_timer((unsigned long)_cf);
+        return IRQ_HANDLED;
+}
+
+static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
+{
+        struct electra_cf_socket *cf;
+
+        if (!sp)
+                return -EINVAL;
+
+        cf = container_of(s, struct electra_cf_socket, socket);
+
+        /* NOTE CF is always 3VCARD */
+        if (electra_cf_present(cf)) {
+                *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
+
+                s->pci_irq = cf->irq;
+        } else
+                *sp = 0;
+        return 0;
+}
+
+static int electra_cf_set_socket(struct pcmcia_socket *sock,
+                                 struct socket_state_t *s)
+{
+        unsigned int gpio;
+        unsigned int vcc;
+        struct electra_cf_socket *cf;
+
+        cf = container_of(sock, struct electra_cf_socket, socket);
+
+        /* "reset" means no power in our case */
+        vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
+
+        switch (vcc) {
+        case 0:
+                gpio = 0;
+                break;
+        case 33:
+                gpio = (1 << cf->gpio_3v);
+                break;
+        case 5:
+                gpio = (1 << cf->gpio_5v);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
+        gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
+        out_le32(cf->gpio_base+0x90, gpio);
+
+        pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
+                driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
+
+        return 0;
+}
+
+static int electra_cf_set_io_map(struct pcmcia_socket *s,
+                                 struct pccard_io_map *io)
+{
+        return 0;
+}
+
+static int electra_cf_set_mem_map(struct pcmcia_socket *s,
+                                  struct pccard_mem_map *map)
+{
+        struct electra_cf_socket *cf;
+
+        if (map->card_start)
+                return -EINVAL;
+        cf = container_of(s, struct electra_cf_socket, socket);
+        map->static_start = cf->mem_phys;
+        map->flags &= MAP_ACTIVE|MAP_ATTRIB;
+        if (!(map->flags & MAP_ATTRIB))
+                map->static_start += 0x800;
+        return 0;
+}
+
+static struct pccard_operations electra_cf_ops = {
+        .init                   = electra_cf_ss_init,
+        .get_status             = electra_cf_get_status,
+        .set_socket             = electra_cf_set_socket,
+        .set_io_map             = electra_cf_set_io_map,
+        .set_mem_map            = electra_cf_set_mem_map,
+};
+
+static int __devinit electra_cf_probe(struct of_device *ofdev,
+                                      const struct of_device_id *match)
+{
+        struct device *device = &ofdev->dev;
+        struct device_node *np = ofdev->node;
+        struct electra_cf_socket   *cf;
+        struct resource mem, io;
+        int status;
+        const unsigned int *prop;
+        int err;
+        struct vm_struct *area;
+
+        err = of_address_to_resource(np, 0, &mem);
+        if (err)
+                return -EINVAL;
+
+        err = of_address_to_resource(np, 1, &io);
+        if (err)
+                return -EINVAL;
+
+        cf = kzalloc(sizeof *cf, GFP_KERNEL);
+        if (!cf)
+                return -ENOMEM;
+
+        setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
+        cf->irq = NO_IRQ;
+
+        cf->ofdev = ofdev;
+        cf->mem_phys = mem.start;
+        cf->mem_size = PAGE_ALIGN(mem.end - mem.start);
+        cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
+        cf->io_size = PAGE_ALIGN(io.end - io.start);
+
+        area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
+        if (area == NULL)
+                return -ENOMEM;
+
+        cf->io_virt = (void __iomem *)(area->addr);
+
+        cf->gpio_base = ioremap(0xfc103000, 0x1000);
+        dev_set_drvdata(device, cf);
+
+        if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
+            (__ioremap_at(io.start, cf->io_virt, cf->io_size,
+                _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
+                dev_err(device, "can't ioremap ranges\n");
+                status = -ENOMEM;
+                goto fail1;
+        }
+
+
+        cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
+
+        cf->iomem.start = (unsigned long)cf->mem_base;
+        cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
+        cf->iomem.flags = IORESOURCE_MEM;
+
+        cf->irq = irq_of_parse_and_map(np, 0);
+
+        status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
+                             driver_name, cf);
+        if (status < 0) {
+                dev_err(device, "request_irq failed\n");
+                goto fail1;
+        }
+
+        cf->socket.pci_irq = cf->irq;
+
+        prop = of_get_property(np, "card-detect-gpio", NULL);
+        if (!prop)
+                goto fail1;
+        cf->gpio_detect = *prop;
+
+        prop = of_get_property(np, "card-vsense-gpio", NULL);
+        if (!prop)
+                goto fail1;
+        cf->gpio_vsense = *prop;
+
+        prop = of_get_property(np, "card-3v-gpio", NULL);
+        if (!prop)
+                goto fail1;
+        cf->gpio_3v = *prop;
+
+        prop = of_get_property(np, "card-5v-gpio", NULL);
+        if (!prop)
+                goto fail1;
+        cf->gpio_5v = *prop;
+
+        cf->socket.io_offset = cf->io_base;
+
+        /* reserve chip-select regions */
+        if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
+                status = -ENXIO;
+                dev_err(device, "Can't claim memory region\n");
+                goto fail1;
+        }
+
+        if (!request_region(cf->io_base, cf->io_size, driver_name)) {
+                status = -ENXIO;
+                dev_err(device, "Can't claim I/O region\n");
+                goto fail2;
+        }
+
+        cf->socket.owner = THIS_MODULE;
+        cf->socket.dev.parent = &ofdev->dev;
+        cf->socket.ops = &electra_cf_ops;
+        cf->socket.resource_ops = &pccard_static_ops;
+        cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
+                                SS_CAP_MEM_ALIGN;
+        cf->socket.map_size = 0x800;
+
+        status = pcmcia_register_socket(&cf->socket);
+        if (status < 0) {
+                dev_err(device, "pcmcia_register_socket failed\n");
+                goto fail3;
+        }
+
+        dev_info(device, "at mem 0x%lx io 0x%lx irq %d\n",
+                 cf->mem_phys, io.start, cf->irq);
+
+        cf->active = 1;
+        electra_cf_timer((unsigned long)cf);
+        return 0;
+
+fail3:
+        release_region(cf->io_base, cf->io_size);
+fail2:
+        release_mem_region(cf->mem_phys, cf->mem_size);
+fail1:
+        if (cf->irq != NO_IRQ)
+                free_irq(cf->irq, cf);
+
+        if (cf->io_virt)
+                __iounmap_at(cf->io_virt, cf->io_size);
+        if (cf->mem_base)
+                iounmap(cf->mem_base);
+        if (cf->gpio_base)
+                iounmap(cf->gpio_base);
+        device_init_wakeup(&ofdev->dev, 0);
+        kfree(cf);
+        return status;
+
+}
+
+static int __devexit electra_cf_remove(struct of_device *ofdev)
+{
+        struct device *device = &ofdev->dev;
+        struct electra_cf_socket *cf;
+
+        cf = dev_get_drvdata(device);
+
+        cf->active = 0;
+        pcmcia_unregister_socket(&cf->socket);
+        free_irq(cf->irq, cf);
+        del_timer_sync(&cf->timer);
+
+        __iounmap_at(cf->io_virt, cf->io_size);
+        iounmap(cf->mem_base);
+        iounmap(cf->gpio_base);
+        release_mem_region(cf->mem_phys, cf->mem_size);
+        release_region(cf->io_base, cf->io_size);
+
+        kfree(cf);
+
+        return 0;
+}
+
+static struct of_device_id electra_cf_match[] = {
+        {
+                .compatible   = "electra-cf",
+        },
+        {},
+};
+
+static struct of_platform_driver electra_cf_driver = {
+        .name      = (char *)driver_name,
+        .match_table    = electra_cf_match,
+        .probe    = electra_cf_probe,
+        .remove   = electra_cf_remove,
+};
+
+static int __init electra_cf_init(void)
+{
+        return of_register_platform_driver(&electra_cf_driver);
+}
+module_init(electra_cf_init);
+
+static void __exit electra_cf_exit(void)
+{
+        of_unregister_platform_driver(&electra_cf_driver);
+}
+module_exit(electra_cf_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
+MODULE_DESCRIPTION("PA Semi Electra CF driver");