--- /dev/null
+/* 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
+
+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 KiB 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/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 void __iomem *iomapadr;
+static DEFINE_SPINLOCK(sbc_gxx_spin);
+
+/* 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 map_word sbc_gxx_read8(struct map_info *map, unsigned long ofs)
+{
+ map_word ret;
+ spin_lock(&sbc_gxx_spin);
+ sbc_gxx_page(map, ofs);
+ ret.x[0] = readb(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);
+ to += thislen;
+ from += thislen;
+ len -= thislen;
+ }
+}
+
+static void sbc_gxx_write8(struct map_info *map, map_word d, unsigned long adr)
+{
+ spin_lock(&sbc_gxx_spin);
+ sbc_gxx_page(map, adr);
+ writeb(d.x[0], 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",
+ .phys = NO_XIP,
+ .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 */
+ .bankwidth = 1,
+ .read = sbc_gxx_read8,
+ .copy_from = sbc_gxx_copy_from,
+ .write = sbc_gxx_write8,
+ .copy_to = sbc_gxx_copy_to
+};
+
+/* MTD device for all of the flash. */
+static struct mtd_info *all_mtd;
+
+static void cleanup_sbc_gxx(void)
+{
+ if( all_mtd ) {
+ mtd_device_unregister(all_mtd);
+ map_destroy( all_mtd );
+ }
+
+ iounmap(iomapadr);
+ release_region(PAGE_IO,PAGE_IO_SIZE);
+}
+
+static int __init init_sbc_gxx(void)
+{
+ iomapadr = ioremap(WINDOW_START, WINDOW_LENGTH);
+ if (!iomapadr) {
+ printk( KERN_ERR"%s: failed to ioremap memory region\n",
+ sbc_gxx_map.name );
+ return -EIO;
+ }
+
+ if (!request_region( PAGE_IO, PAGE_IO_SIZE, "SBC-GXx flash")) {
+ 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 );
+ iounmap(iomapadr);
+ return -EAGAIN;
+ }
+
+
+ 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_probe", &sbc_gxx_map );
+ if( !all_mtd ) {
+ cleanup_sbc_gxx();
+ return -ENXIO;
+ }
+
+ all_mtd->owner = THIS_MODULE;
+
+ /* Create MTD devices for each partition. */
+ mtd_device_register(all_mtd, partition_info, NUM_PARTITIONS);
+
+ return 0;
+}
+
+module_init(init_sbc_gxx);
+module_exit(cleanup_sbc_gxx);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Arcom Control Systems Ltd.");
+MODULE_DESCRIPTION("MTD map driver for SBC-GXm and SBC-GX1 series boards");
Code Review / kvmfornfv.git / blobdiff