pcmcia: add support CompactFlash PCMCIA support for Blackfin.

A new host driver to add CompactFlash PCMCIA support for Blackfin.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

3 files changed, 347 insertions, 0 deletions

diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
index 1b0eb5aaf650..e45402adac3f 100644
--- a/drivers/pcmcia/Kconfig
+++ b/drivers/pcmcia/Kconfig
@@ -263,6 +263,13 @@ config OMAP_CF
           Say Y here to support the CompactFlash controller on OMAP.
           Note that this doesn't support "True IDE" mode.
 
+config BFIN_CFPCMCIA
+        tristate "Blackfin CompactFlash PCMCIA Driver"
+        depends on PCMCIA && BLACKFIN
+        help
+          Say Y here to support the CompactFlash PCMCIA driver for Blackfin.
+
+
 config AT91_CF
         tristate "AT91 CompactFlash Controller"
         depends on PCMCIA && ARCH_AT91RM9200
diff --git a/drivers/pcmcia/Makefile b/drivers/pcmcia/Makefile
index 6f6478ba7174..85c6cc931f97 100644
--- a/drivers/pcmcia/Makefile
+++ b/drivers/pcmcia/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_PCMCIA_AU1X00)			+= au1x00_ss.o
 obj-$(CONFIG_PCMCIA_VRC4171)                    += vrc4171_card.o
 obj-$(CONFIG_PCMCIA_VRC4173)                    += vrc4173_cardu.o
 obj-$(CONFIG_OMAP_CF)                           += omap_cf.o
+obj-$(CONFIG_BFIN_CFPCMCIA)                     += bfin_cf_pcmcia.o
 obj-$(CONFIG_AT91_CF)                           += at91_cf.o
 obj-$(CONFIG_ELECTRA_CF)                        += electra_cf.o
 
diff --git a/drivers/pcmcia/bfin_cf_pcmcia.c b/drivers/pcmcia/bfin_cf_pcmcia.c
new file mode 100644
index 000000000000..bb7338863fb9
--- /dev/null
+++ b/drivers/pcmcia/bfin_cf_pcmcia.c
@@ -0,0 +1,339 @@
+/*
+ * file: drivers/pcmcia/bfin_cf.c
+ *
+ * based on: drivers/pcmcia/omap_cf.c
+ * omap_cf.c -- OMAP 16xx CompactFlash controller driver
+ *
+ * Copyright (c) 2005 David Brownell
+ * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
+ *
+ * bugs:         enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, 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; see the file copying.
+ * if not, write to the free software foundation,
+ * 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/irq.h>
+#include <linux/io.h>
+
+#include <pcmcia/ss.h>
+#include <pcmcia/cisreg.h>
+#include <asm/gpio.h>
+
+#define SZ_1K   0x00000400
+#define SZ_8K   0x00002000
+#define SZ_2K   (2 * SZ_1K)
+
+#define POLL_INTERVAL   (2 * HZ)
+
+#define CF_ATASEL_ENA   0x20311802      /* Inverts RESET */
+#define CF_ATASEL_DIS   0x20311800
+
+#define bfin_cf_present(pfx) (gpio_get_value(pfx))
+
+/*--------------------------------------------------------------------------*/
+
+static const char driver_name[] = "bfin_cf_pcmcia";
+
+struct bfin_cf_socket {
+        struct pcmcia_socket socket;
+
+        struct timer_list timer;
+        unsigned present:1;
+        unsigned active:1;
+
+        struct platform_device *pdev;
+        unsigned long phys_cf_io;
+        unsigned long phys_cf_attr;
+        u_int irq;
+        u_short cd_pfx;
+};
+
+/*--------------------------------------------------------------------------*/
+static int bfin_cf_reset(void)
+{
+        outw(0, CF_ATASEL_ENA);
+        mdelay(200);
+        outw(0, CF_ATASEL_DIS);
+
+        return 0;
+}
+
+static int bfin_cf_ss_init(struct pcmcia_socket *s)
+{
+        return 0;
+}
+
+/* the timer is primarily to kick this socket's pccardd */
+static void bfin_cf_timer(unsigned long _cf)
+{
+        struct bfin_cf_socket *cf = (void *)_cf;
+        unsigned short present = bfin_cf_present(cf->cd_pfx);
+
+        if (present != cf->present) {
+                cf->present = present;
+                dev_dbg(&cf->pdev->dev, ": card %s\n",
+                         present ? "present" : "gone");
+                pcmcia_parse_events(&cf->socket, SS_DETECT);
+        }
+
+        if (cf->active)
+                mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
+}
+
+static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
+{
+        struct bfin_cf_socket *cf;
+
+        if (!sp)
+                return -EINVAL;
+
+        cf = container_of(s, struct bfin_cf_socket, socket);
+
+        if (bfin_cf_present(cf->cd_pfx)) {
+                *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
+                s->irq.AssignedIRQ = 0;
+                s->pci_irq = cf->irq;
+
+        } else
+                *sp = 0;
+        return 0;
+}
+
+static int
+bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
+{
+
+        struct bfin_cf_socket *cf;
+        cf = container_of(sock, struct bfin_cf_socket, socket);
+
+        switch (s->Vcc) {
+        case 0:
+        case 33:
+                break;
+        case 50:
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (s->flags & SS_RESET) {
+                disable_irq(cf->irq);
+                bfin_cf_reset();
+                enable_irq(cf->irq);
+        }
+
+        dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
+                 s->Vcc, s->io_irq, s->flags, s->csc_mask);
+
+        return 0;
+}
+
+static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
+{
+        return bfin_cf_set_socket(s, &dead_socket);
+}
+
+/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
+
+static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
+{
+        struct bfin_cf_socket *cf;
+
+        cf = container_of(s, struct bfin_cf_socket, socket);
+        io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
+        io->start = cf->phys_cf_io;
+        io->stop = io->start + SZ_2K - 1;
+        return 0;
+}
+
+static int
+bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
+{
+        struct bfin_cf_socket *cf;
+
+        if (map->card_start)
+                return -EINVAL;
+        cf = container_of(s, struct bfin_cf_socket, socket);
+        map->static_start = cf->phys_cf_io;
+        map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
+        if (map->flags & MAP_ATTRIB)
+                map->static_start = cf->phys_cf_attr;
+
+        return 0;
+}
+
+static struct pccard_operations bfin_cf_ops = {
+        .init = bfin_cf_ss_init,
+        .suspend = bfin_cf_ss_suspend,
+        .get_status = bfin_cf_get_status,
+        .set_socket = bfin_cf_set_socket,
+        .set_io_map = bfin_cf_set_io_map,
+        .set_mem_map = bfin_cf_set_mem_map,
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __devinit bfin_cf_probe(struct platform_device *pdev)
+{
+        struct bfin_cf_socket *cf;
+        struct resource *io_mem, *attr_mem;
+        int irq;
+        unsigned short cd_pfx;
+        int status = 0;
+
+        dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");
+
+        irq = platform_get_irq(pdev, 0);
+        if (!irq)
+                return -EINVAL;
+
+        cd_pfx = platform_get_irq(pdev, 1);     /*Card Detect GPIO PIN */
+
+        if (gpio_request(cd_pfx, "pcmcia: CD")) {
+                dev_err(&pdev->dev,
+                       "Failed ro request Card Detect GPIO_%d\n",
+                       cd_pfx);
+                return -EBUSY;
+        }
+        gpio_direction_input(cd_pfx);
+
+        cf = kzalloc(sizeof *cf, GFP_KERNEL);
+        if (!cf) {
+                gpio_free(cd_pfx);
+                return -ENOMEM;
+        }
+
+        cf->cd_pfx = cd_pfx;
+
+        setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);
+
+        cf->pdev = pdev;
+        platform_set_drvdata(pdev, cf);
+
+        cf->irq = irq;
+        cf->socket.pci_irq = irq;
+
+        set_irq_type(irq, IRQF_TRIGGER_LOW);
+
+        io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+        if (!io_mem || !attr_mem)
+                goto fail0;
+
+        cf->phys_cf_io = io_mem->start;
+        cf->phys_cf_attr = attr_mem->start;
+
+        /* pcmcia layer only remaps "real" memory */
+        cf->socket.io_offset = (unsigned long)
+            ioremap(cf->phys_cf_io, SZ_2K);
+
+        if (!cf->socket.io_offset)
+                goto fail0;
+
+        dev_err(&pdev->dev, ": on irq %d\n", irq);
+
+        dev_dbg(&pdev->dev, ": %s\n",
+                 bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");
+
+        cf->socket.owner = THIS_MODULE;
+        cf->socket.dev.parent = &pdev->dev;
+        cf->socket.ops = &bfin_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 = SZ_2K;
+
+        status = pcmcia_register_socket(&cf->socket);
+        if (status < 0)
+                goto fail2;
+
+        cf->active = 1;
+        mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
+        return 0;
+
+fail2:
+        iounmap((void __iomem *)cf->socket.io_offset);
+        release_mem_region(cf->phys_cf_io, SZ_8K);
+
+fail0:
+        gpio_free(cf->cd_pfx);
+        kfree(cf);
+        platform_set_drvdata(pdev, NULL);
+
+        return status;
+}
+
+static int __devexit bfin_cf_remove(struct platform_device *pdev)
+{
+        struct bfin_cf_socket *cf = platform_get_drvdata(pdev);
+
+        gpio_free(cf->cd_pfx);
+        cf->active = 0;
+        pcmcia_unregister_socket(&cf->socket);
+        del_timer_sync(&cf->timer);
+        iounmap((void __iomem *)cf->socket.io_offset);
+        release_mem_region(cf->phys_cf_io, SZ_8K);
+        platform_set_drvdata(pdev, NULL);
+        kfree(cf);
+        return 0;
+}
+
+static int bfin_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+        return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
+}
+
+static int bfin_cf_resume(struct platform_device *pdev)
+{
+        return pcmcia_socket_dev_resume(&pdev->dev);
+}
+
+static struct platform_driver bfin_cf_driver = {
+        .driver = {
+                   .name = (char *)driver_name,
+                   .owner = THIS_MODULE,
+                   },
+        .probe = bfin_cf_probe,
+        .remove = __devexit_p(bfin_cf_remove),
+        .suspend = bfin_cf_suspend,
+        .resume = bfin_cf_resume,
+};
+
+static int __init bfin_cf_init(void)
+{
+        return platform_driver_register(&bfin_cf_driver);
+}
+
+static void __exit bfin_cf_exit(void)
+{
+        platform_driver_unregister(&bfin_cf_driver);
+}
+
+module_init(bfin_cf_init);
+module_exit(bfin_cf_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>")
+MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
+MODULE_LICENSE("GPL");