1 files changed, 198 insertions, 0 deletions

diff --git a/drivers/mtd/maps/vmax301.c b/drivers/mtd/maps/vmax301.c
new file mode 100644
index 000000000000..c8c74110ed1b
--- /dev/null
+++ b/drivers/mtd/maps/vmax301.c
@@ -0,0 +1,198 @@
+// $Id: vmax301.c,v 1.30 2004/07/12 22:38:29 dwmw2 Exp $
+/* ######################################################################
+
+   Tempustech VMAX SBC301 MTD Driver.
+  
+   The VMAx 301 is a SBC based on . It
+   comes with three builtin AMD 29F016B flash chips and a socket for SRAM or
+   more flash. Each unit has it's own 8k mapping into a settable region 
+   (0xD8000). There are two 8k mappings for each MTD, the first is always set
+   to the lower 8k of the device the second is paged. Writing a 16 bit page
+   value to anywhere in the first 8k will cause the second 8k to page around.
+
+   To boot the device a bios extension must be installed into the first 8k 
+   of flash that is smart enough to copy itself down, page in the rest of 
+   itself and begin executing.
+   
+   ##################################################################### */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <asm/io.h>
+
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+
+
+#define WINDOW_START 0xd8000
+#define WINDOW_LENGTH 0x2000
+#define WINDOW_SHIFT 25
+#define WINDOW_MASK 0x1FFF
+
+/* Actually we could use two spinlocks, but we'd have to have
+   more private space in the struct map_info. We lose a little
+   performance like this, but we'd probably lose more by having
+   the extra indirection from having one of the map->map_priv 
+   fields pointing to yet another private struct.
+*/
+static DEFINE_SPINLOCK(vmax301_spin);
+
+static void __vmax301_page(struct map_info *map, unsigned long page)
+{
+        writew(page, map->map_priv_2 - WINDOW_LENGTH);
+        map->map_priv_1 = page;
+}
+
+static inline void vmax301_page(struct map_info *map,
+                                  unsigned long ofs)
+{
+        unsigned long page = (ofs >> WINDOW_SHIFT);
+        if (map->map_priv_1 != page)
+                __vmax301_page(map, page);
+}
+
+static map_word vmax301_read8(struct map_info *map, unsigned long ofs)
+{
+        map_word ret;
+        spin_lock(&vmax301_spin);
+        vmax301_page(map, ofs);
+        ret.x[0] = readb(map->map_priv_2 + (ofs & WINDOW_MASK));
+        spin_unlock(&vmax301_spin);
+        return ret;
+}
+
+static void vmax301_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+        while(len) {
+                unsigned long thislen = len;
+                if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
+                        thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
+                spin_lock(&vmax301_spin);
+                vmax301_page(map, from);
+                memcpy_fromio(to, map->map_priv_2 + from, thislen);
+                spin_unlock(&vmax301_spin);
+                to += thislen;
+                from += thislen;
+                len -= thislen;
+        }
+}
+
+static void vmax301_write8(struct map_info *map, map_word d, unsigned long adr)
+{
+        spin_lock(&vmax301_spin);
+        vmax301_page(map, adr);
+        writeb(d.x[0], map->map_priv_2 + (adr & WINDOW_MASK));
+        spin_unlock(&vmax301_spin);
+}
+
+static void vmax301_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+        while(len) {
+                unsigned long thislen = len;
+                if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
+                        thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
+
+                spin_lock(&vmax301_spin);
+                vmax301_page(map, to);
+                memcpy_toio(map->map_priv_2 + to, from, thislen);
+                spin_unlock(&vmax301_spin);             
+                to += thislen;
+                from += thislen;
+                len -= thislen;
+        }
+}
+
+static struct map_info vmax_map[2] = {
+        {
+                .name = "VMAX301 Internal Flash",
+                .phys = NO_XIP,
+                .size = 3*2*1024*1024,
+                .bankwidth = 1,
+                .read = vmax301_read8,
+                .copy_from = vmax301_copy_from,
+                .write = vmax301_write8,
+                .copy_to = vmax301_copy_to,
+                .map_priv_1 = WINDOW_START + WINDOW_LENGTH,
+                .map_priv_2 = 0xFFFFFFFF
+        },
+        {
+                .name = "VMAX301 Socket",
+                .phys = NO_XIP,
+                .size = 0,
+                .bankwidth = 1,
+                .read = vmax301_read8,
+                .copy_from = vmax301_copy_from,
+                .write = vmax301_write8,
+                .copy_to = vmax301_copy_to,
+                .map_priv_1 = WINDOW_START + (3*WINDOW_LENGTH),
+                .map_priv_2 = 0xFFFFFFFF
+        }
+};
+
+static struct mtd_info *vmax_mtd[2] = {NULL, NULL};
+
+static void __exit cleanup_vmax301(void)
+{
+        int i;
+        
+        for (i=0; i<2; i++) {
+                if (vmax_mtd[i]) {
+                        del_mtd_device(vmax_mtd[i]);
+                        map_destroy(vmax_mtd[i]);
+                }
+        }
+        iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START);
+}
+
+int __init init_vmax301(void)
+{
+        int i;
+        unsigned long iomapadr;
+        // Print out our little header..
+        printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START,
+               WINDOW_START+4*WINDOW_LENGTH);
+
+        iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4);
+        if (!iomapadr) {
+                printk("Failed to ioremap memory region\n");
+                return -EIO;
+        }
+        /* Put the address in the map's private data area.
+           We store the actual MTD IO address rather than the 
+           address of the first half, because it's used more
+           often. 
+        */
+        vmax_map[0].map_priv_2 = iomapadr + WINDOW_START;
+        vmax_map[1].map_priv_2 = iomapadr + (3*WINDOW_START);
+        
+        for (i=0; i<2; i++) {
+                vmax_mtd[i] = do_map_probe("cfi_probe", &vmax_map[i]);
+                if (!vmax_mtd[i])
+                        vmax_mtd[i] = do_map_probe("jedec", &vmax_map[i]);
+                if (!vmax_mtd[i])
+                        vmax_mtd[i] = do_map_probe("map_ram", &vmax_map[i]);
+                if (!vmax_mtd[i])
+                        vmax_mtd[i] = do_map_probe("map_rom", &vmax_map[i]);
+                if (vmax_mtd[i]) {
+                        vmax_mtd[i]->owner = THIS_MODULE;
+                        add_mtd_device(vmax_mtd[i]);
+                }
+        }
+
+        if (!vmax_mtd[1] && !vmax_mtd[2]) {
+                iounmap((void *)iomapadr);
+                return -ENXIO;
+        }
+
+        return 0;
+}
+
+module_init(init_vmax301);
+module_exit(cleanup_vmax301);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("MTD map driver for Tempustech VMAX SBC301 board");