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

• Lines: 279
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/maps/sbc_gxx.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/maps/sbc_gxx.c linux/drivers/mtd/maps/sbc_gxx.c
@@ -0,0 +1,278 @@
+/* sbc_gxx.c -- MTD map driver for Arcom Control Systems SBC-MediaGX,
+                SBC-GXm and SBC-GX1 series boards.
+ 
+   Copyright (C) 2001 Arcom Control System Ltd
+ 
+   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
+
+   $Id: sbc_gxx.c,v 1.17 2001/06/02 14:52:23 dwmw2 Exp $
+
+The SBC-MediaGX / SBC-GXx has up to 16 MiB of 
+Intel StrataFlash (28F320/28F640) in x8 mode.  
+
+This driver uses the CFI probe and Intel Extended Command Set drivers.
+
+The flash is accessed as follows:
+
+   16 kbyte memory window at 0xdc000-0xdffff
+   
+   Two IO address locations for paging
+   
+   0x258
+       bit 0-7: address bit 14-21
+   0x259
+       bit 0-1: address bit 22-23
+       bit 7:   0 - reset/powered down
+                1 - device enabled
+
+The single flash device is divided into 3 partition which appear as 
+separate MTD devices.
+
+25/04/2001 AJL (Arcom)  Modified signon strings and partition sizes
+                        (to support bzImages up to 638KiB-ish)
+*/
+
+// Includes
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+// Defines
+
+// - Hardware specific
+
+#define WINDOW_START 0xdc000
+
+/* Number of bits in offset. */
+#define WINDOW_SHIFT 14
+#define WINDOW_LENGTH (1 << WINDOW_SHIFT)
+
+/* The bits for the offset into the window. */
+#define WINDOW_MASK (WINDOW_LENGTH-1)
+#define PAGE_IO 0x258
+#define PAGE_IO_SIZE 2
+
+/* bit 7 of 0x259 must be 1 to enable device. */
+#define DEVICE_ENABLE 0x8000
+
+// - Flash / Partition sizing
+
+#define MAX_SIZE_KiB             16384
+#define BOOT_PARTITION_SIZE_KiB  768
+#define DATA_PARTITION_SIZE_KiB  1280
+#define APP_PARTITION_SIZE_KiB   6144
+
+// Globals
+
+static volatile int page_in_window = -1; // Current page in window.
+static unsigned long iomapadr;
+static spinlock_t sbc_gxx_spin = SPIN_LOCK_UNLOCKED;
+
+/* partition_info gives details on the logical partitions that the split the 
+ * single flash device into. If the size if zero we use up to the end of the
+ * device. */
+static struct mtd_partition partition_info[]={
+    { name: "SBC-GXx flash boot partition", 
+      offset: 0, 
+      size:   BOOT_PARTITION_SIZE_KiB*1024 },
+    { name: "SBC-GXx flash data partition", 
+      offset: BOOT_PARTITION_SIZE_KiB*1024, 
+      size: (DATA_PARTITION_SIZE_KiB)*1024 },
+    { name: "SBC-GXx flash application partition", 
+      offset: (BOOT_PARTITION_SIZE_KiB+DATA_PARTITION_SIZE_KiB)*1024 }
+};
+
+#define NUM_PARTITIONS 3
+
+static inline void sbc_gxx_page(struct map_info *map, unsigned long ofs)
+{
+	unsigned long page = ofs >> WINDOW_SHIFT;
+
+	if( page!=page_in_window ) {
+		outw( page | DEVICE_ENABLE, PAGE_IO );
+		page_in_window = page;
+	}
+}
+
+
+static __u8 sbc_gxx_read8(struct map_info *map, unsigned long ofs)
+{
+	__u8 ret;
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, ofs);
+	ret = readb(iomapadr + (ofs & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+	return ret;
+}
+
+static __u16 sbc_gxx_read16(struct map_info *map, unsigned long ofs)
+{
+	__u16 ret;
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, ofs);
+	ret = readw(iomapadr + (ofs & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+	return ret;
+}
+
+static __u32 sbc_gxx_read32(struct map_info *map, unsigned long ofs)
+{
+	__u32 ret;
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, ofs);
+	ret = readl(iomapadr + (ofs & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+	return ret;
+}
+
+static void sbc_gxx_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(&sbc_gxx_spin);
+		sbc_gxx_page(map, from);
+		memcpy_fromio(to, iomapadr + (from & WINDOW_MASK), thislen);
+		spin_unlock(&sbc_gxx_spin);
+		(__u8*)to += thislen;
+		from += thislen;
+		len -= thislen;
+	}
+}
+
+static void sbc_gxx_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, adr);
+	writeb(d, iomapadr + (adr & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+}
+
+static void sbc_gxx_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, adr);
+	writew(d, iomapadr + (adr & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+}
+
+static void sbc_gxx_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	spin_lock(&sbc_gxx_spin);
+	sbc_gxx_page(map, adr);
+	writel(d, iomapadr + (adr & WINDOW_MASK));
+	spin_unlock(&sbc_gxx_spin);
+}
+
+static void sbc_gxx_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(&sbc_gxx_spin);
+		sbc_gxx_page(map, to);
+		memcpy_toio(iomapadr + (to & WINDOW_MASK), from, thislen);
+		spin_unlock(&sbc_gxx_spin);
+		to += thislen;
+		from += thislen;
+		len -= thislen;
+	}
+}
+
+static struct map_info sbc_gxx_map = {
+	name: "SBC-GXx flash",
+	size: MAX_SIZE_KiB*1024, /* this must be set to a maximum possible amount
+			 of flash so the cfi probe routines find all
+			 the chips */
+	buswidth: 1,
+	read8: sbc_gxx_read8,
+	read16: sbc_gxx_read16,
+	read32: sbc_gxx_read32,
+	copy_from: sbc_gxx_copy_from,
+	write8: sbc_gxx_write8,
+	write16: sbc_gxx_write16,
+	write32: sbc_gxx_write32,
+	copy_to: sbc_gxx_copy_to
+};
+
+/* MTD device for all of the flash. */
+static struct mtd_info *all_mtd;
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define init_sbc_gxx init_module
+#define cleanup_sbc_gxx cleanup_module
+#endif
+
+mod_exit_t cleanup_sbc_gxx(void)
+{
+	if( all_mtd ) {
+		del_mtd_partitions( all_mtd );
+		map_destroy( all_mtd );
+	}
+
+	iounmap((void *)iomapadr);
+	release_region(PAGE_IO,PAGE_IO_SIZE);
+}
+
+mod_init_t init_sbc_gxx(void)
+{
+	if (check_region(PAGE_IO,PAGE_IO_SIZE) != 0) {
+		printk( KERN_ERR"%s: IO ports 0x%x-0x%x in use\n",
+			sbc_gxx_map.name,
+			PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1 );
+		return -EAGAIN;
+	}
+  	iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH);
+	if (!iomapadr) {
+		printk( KERN_ERR"%s: failed to ioremap memory region\n",
+			sbc_gxx_map.name );
+		return -EIO;
+	}
+	
+	request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash" );
+	
+	printk( KERN_INFO"%s: IO:0x%x-0x%x MEM:0x%x-0x%x\n",
+		sbc_gxx_map.name,
+		PAGE_IO, PAGE_IO+PAGE_IO_SIZE-1,
+		WINDOW_START, WINDOW_START+WINDOW_LENGTH-1 );
+
+	/* Probe for chip. */
+	all_mtd = do_map_probe( "cfi", &sbc_gxx_map );
+	if( !all_mtd ) {
+		cleanup_sbc_gxx();
+		return -ENXIO;
+	}
+	
+	all_mtd->module=THIS_MODULE;
+
+	/* Create MTD devices for each partition. */
+	add_mtd_partitions(all_mtd, partition_info, NUM_PARTITIONS );
+
+	return 0;
+}
+
+module_init(init_sbc_gxx);
+module_exit(cleanup_sbc_gxx);