patch-2.4.6 linux/drivers/mtd/maps/vmax301.c

• Lines: 241
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/maps/vmax301.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/maps/vmax301.c linux/drivers/mtd/maps/vmax301.c
@@ -0,0 +1,240 @@
+// $Id: vmax301.c,v 1.22 2001/06/02 14:30:44 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>
+
+
+#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 spinlock_t vmax301_spin = SPIN_LOCK_UNLOCKED;
+
+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 __u8 vmax301_read8(struct map_info *map, unsigned long ofs)
+{
+	__u8 ret;
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, ofs);
+	ret = readb(map->map_priv_2 + (ofs & WINDOW_MASK));
+	spin_unlock(&vmax301_spin);
+	return ret;
+}
+
+static __u16 vmax301_read16(struct map_info *map, unsigned long ofs)
+{
+	__u16 ret;
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, ofs);
+	ret = readw(map->map_priv_2 + (ofs & WINDOW_MASK));
+	spin_unlock(&vmax301_spin);
+	return ret;
+}
+
+static __u32 vmax301_read32(struct map_info *map, unsigned long ofs)
+{
+	__u32 ret;
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, ofs);
+	ret =  readl(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, __u8 d, unsigned long adr)
+{
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, adr);
+	writeb(d, map->map_priv_2 + (adr & WINDOW_MASK));
+	spin_unlock(&vmax301_spin);
+}
+
+static void vmax301_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, adr);
+	writew(d, map->map_priv_2 + (adr & WINDOW_MASK));
+	spin_unlock(&vmax301_spin);
+}
+
+static void vmax301_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	spin_lock(&vmax301_spin);
+	vmax301_page(map, adr);
+	writel(d, 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",
+		size: 3*2*1024*1024,
+		buswidth: 1,
+		read8: vmax301_read8,
+		read16: vmax301_read16,
+		read32: vmax301_read32,
+		copy_from: vmax301_copy_from,
+		write8: vmax301_write8,
+		write16: vmax301_write16,
+		write32: vmax301_write32,
+		copy_to: vmax301_copy_to,
+		map_priv_1: WINDOW_START + WINDOW_LENGTH,
+		map_priv_2: 0xFFFFFFFF
+	},
+	{
+		name: "VMAX301 Socket",
+		size: 0,
+		buswidth: 1,
+		read8: vmax301_read8,
+		read16: vmax301_read16,
+		read32: vmax301_read32,
+		copy_from: vmax301_copy_from,
+		write8: vmax301_write8,
+		write16: vmax301_write16,
+		write32: vmax301_write32,
+		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};
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define init_vmax301 init_module
+#define cleanup_vmax301 cleanup_module
+#endif
+
+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_1 = iomapadr + WINDOW_START;
+	vmax_map[1].map_priv_1 = iomapadr + (3*WINDOW_START);
+	
+	for (i=0; i<2; i++) {
+		vmax_mtd[i] = do_map_probe("cfi", &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("ram", &vmax_map[i]);
+		if (!vmax_mtd[i])
+			vmax_mtd[i] = do_map_probe("rom", &vmax_map[i]);
+		if (vmax_mtd[i]) {
+			vmax_mtd[i]->module = 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);