[MTD] [MAPS] Blackfin Async Flash Maps

Handle the case where flash memory and ethernet mac/phy are mapped onto
the same async bank

[try #4]
 - drop superfluous casts
 - drop SSYNC() when reading from the flash and rewrite
   bfin_copy_from() to be like bfin_copy_to() so that
   we dont have to handle all the aligned/unaligned cases

[try #3] rename bf5xx-flash to bfin-async-flash
 - move all kconfig board settings into board resources
 - fixup casting style according to lkml feedback
 - rewrite driver so that it can handle arbitrary of
   instances according to the declared platform resources

[try #2]
Remove useless SSYNC() as Will said

[try #1]
The BF533-STAMP does this for example.
All board-specific configuration goes in your board resources file.

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Acked-By: Jörn Engel <joern@logfs.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

3 files changed, 231 insertions, 0 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index b2c180245618..02c45e1e24ee 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -523,6 +523,17 @@ config MTD_PCMCIA_ANONYMOUS
 
           If unsure, say N.
 
+config MTD_BFIN_ASYNC
+        tristate "Blackfin BF533-STAMP Flash Chip Support"
+        depends on BFIN533_STAMP && MTD_CFI
+        select MTD_PARTITIONS
+        default y
+        help
+          Map driver which allows for simultaneous utilization of
+          ethernet and CFI parallel flash.
+
+          If compiled as a module, it will be called bfin-async-flash.
+
 config MTD_UCLINUX
         tristate "Generic uClinux RAM/ROM filesystem support"
         depends on MTD_PARTITIONS && !MMU
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 5444eaf4026f..d6cfce490583 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -67,3 +67,4 @@ obj-$(CONFIG_MTD_PLATRAM)	+= plat-ram.o
 obj-$(CONFIG_MTD_OMAP_NOR)      += omap_nor.o
 obj-$(CONFIG_MTD_MTX1)          += mtx-1_flash.o
 obj-$(CONFIG_MTD_INTEL_VR_NOR)  += intel_vr_nor.o
+obj-$(CONFIG_MTD_BFIN_ASYNC)    += bfin-async-flash.o
diff --git a/drivers/mtd/maps/bfin-async-flash.c b/drivers/mtd/maps/bfin-async-flash.c
new file mode 100644
index 000000000000..6fec86aaed7e
--- /dev/null
+++ b/drivers/mtd/maps/bfin-async-flash.c
@@ -0,0 +1,219 @@
+/*
+ * drivers/mtd/maps/bfin-async-flash.c
+ *
+ * Handle the case where flash memory and ethernet mac/phy are
+ * mapped onto the same async bank.  The BF533-STAMP does this
+ * for example.  All board-specific configuration goes in your
+ * board resources file.
+ *
+ * Copyright 2000 Nicolas Pitre <nico@cam.org>
+ * Copyright 2005-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/physmap.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <asm/blackfin.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <asm/unaligned.h>
+
+#define pr_devinit(fmt, args...) ({ static const __devinitconst char __fmt[] = fmt; printk(__fmt, ## args); })
+
+#define DRIVER_NAME "bfin-async-flash"
+
+struct async_state {
+        struct mtd_info *mtd;
+        struct map_info map;
+        int enet_flash_pin;
+        uint32_t flash_ambctl0, flash_ambctl1;
+        uint32_t save_ambctl0, save_ambctl1;
+        unsigned long irq_flags;
+};
+
+static void switch_to_flash(struct async_state *state)
+{
+        local_irq_save(state->irq_flags);
+
+        gpio_set_value(state->enet_flash_pin, 0);
+
+        state->save_ambctl0 = bfin_read_EBIU_AMBCTL0();
+        state->save_ambctl1 = bfin_read_EBIU_AMBCTL1();
+        bfin_write_EBIU_AMBCTL0(state->flash_ambctl0);
+        bfin_write_EBIU_AMBCTL1(state->flash_ambctl1);
+        SSYNC();
+}
+
+static void switch_back(struct async_state *state)
+{
+        bfin_write_EBIU_AMBCTL0(state->save_ambctl0);
+        bfin_write_EBIU_AMBCTL1(state->save_ambctl1);
+        SSYNC();
+
+        gpio_set_value(state->enet_flash_pin, 1);
+
+        local_irq_restore(state->irq_flags);
+}
+
+static map_word bfin_read(struct map_info *map, unsigned long ofs)
+{
+        struct async_state *state = (struct async_state *)map->map_priv_1;
+        uint16_t word;
+        map_word test;
+
+        switch_to_flash(state);
+
+        word = readw(map->virt + ofs);
+
+        switch_back(state);
+
+        test.x[0] = word;
+        return test;
+}
+
+static void bfin_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+        struct async_state *state = (struct async_state *)map->map_priv_1;
+
+        switch_to_flash(state);
+
+        memcpy(to, map->virt + from, len);
+
+        switch_back(state);
+}
+
+static void bfin_write(struct map_info *map, map_word d1, unsigned long ofs)
+{
+        struct async_state *state = (struct async_state *)map->map_priv_1;
+        uint16_t d;
+
+        d = d1.x[0];
+
+        switch_to_flash(state);
+
+        writew(d, map->virt + ofs);
+        SSYNC();
+
+        switch_back(state);
+}
+
+static void bfin_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+        struct async_state *state = (struct async_state *)map->map_priv_1;
+
+        switch_to_flash(state);
+
+        memcpy(map->virt + to, from, len);
+        SSYNC();
+
+        switch_back(state);
+}
+
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
+#endif
+
+static int __devinit bfin_flash_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct physmap_flash_data *pdata = pdev->dev.platform_data;
+        struct resource *memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        struct resource *flash_ambctl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        struct async_state *state;
+
+        state = kzalloc(sizeof(*state), GFP_KERNEL);
+        if (!state)
+                return -ENOMEM;
+
+        state->map.name       = DRIVER_NAME;
+        state->map.read       = bfin_read;
+        state->map.copy_from  = bfin_copy_from;
+        state->map.write      = bfin_write;
+        state->map.copy_to    = bfin_copy_to;
+        state->map.bankwidth  = pdata->width;
+        state->map.size       = memory->end - memory->start + 1;
+        state->map.virt       = (void __iomem *)memory->start;
+        state->map.phys       = memory->start;
+        state->map.map_priv_1 = (unsigned long)state;
+        state->enet_flash_pin = platform_get_irq(pdev, 0);
+        state->flash_ambctl0  = flash_ambctl->start;
+        state->flash_ambctl1  = flash_ambctl->end;
+
+        if (gpio_request(state->enet_flash_pin, DRIVER_NAME)) {
+                pr_devinit(KERN_ERR DRIVER_NAME ": Failed to request gpio %d\n", state->enet_flash_pin);
+                return -EBUSY;
+        }
+        gpio_direction_output(state->enet_flash_pin, 1);
+
+        pr_devinit(KERN_NOTICE DRIVER_NAME ": probing %d-bit flash bus\n", state->map.bankwidth * 8);
+        state->mtd = do_map_probe(memory->name, &state->map);
+        if (!state->mtd)
+                return -ENXIO;
+
+#ifdef CONFIG_MTD_PARTITIONS
+        ret = parse_mtd_partitions(state->mtd, part_probe_types, &pdata->parts, 0);
+        if (ret > 0) {
+                pr_devinit(KERN_NOTICE DRIVER_NAME ": Using commandline partition definition\n");
+                add_mtd_partitions(state->mtd, pdata->parts, ret);
+
+        } else if (pdata->nr_parts) {
+                pr_devinit(KERN_NOTICE DRIVER_NAME ": Using board partition definition\n");
+                add_mtd_partitions(state->mtd, pdata->parts, pdata->nr_parts);
+
+        } else
+#endif
+        {
+                pr_devinit(KERN_NOTICE DRIVER_NAME ": no partition info available, registering whole flash at once\n");
+                add_mtd_device(state->mtd);
+        }
+
+        platform_set_drvdata(pdev, state);
+
+        return 0;
+}
+
+static int __devexit bfin_flash_remove(struct platform_device *pdev)
+{
+        struct async_state *state = platform_get_drvdata(pdev);
+        gpio_free(state->enet_flash_pin);
+#ifdef CONFIG_MTD_PARTITIONS
+        del_mtd_partitions(state->mtd);
+#endif
+        map_destroy(state->mtd);
+        kfree(state);
+        return 0;
+}
+
+static struct platform_driver bfin_flash_driver = {
+        .probe          = bfin_flash_probe,
+        .remove         = __devexit_p(bfin_flash_remove),
+        .driver         = {
+                .name   = DRIVER_NAME,
+        },
+};
+
+static int __init bfin_flash_init(void)
+{
+        return platform_driver_register(&bfin_flash_driver);
+}
+module_init(bfin_flash_init);
+
+static void __exit bfin_flash_exit(void)
+{
+        platform_driver_unregister(&bfin_flash_driver);
+}
+module_exit(bfin_flash_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MTD map driver for Blackfins with flash/ethernet on same async bank");