patch-2.4.11-dontuse linux/drivers/mtd/maps/tqm8xxl.c

• Lines: 316
• Date: Thu Oct 4 15:14:59 2001
• Orig file: v2.4.10/linux/drivers/mtd/maps/tqm8xxl.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.10/linux/drivers/mtd/maps/tqm8xxl.c linux/drivers/mtd/maps/tqm8xxl.c
@@ -0,0 +1,315 @@
+/*
+ * Handle mapping of the flash memory access routines 
+ * on TQM8xxL based devices.
+ *
+ * $Id: tqm8xxl.c,v 1.3 2001/10/02 15:05:14 dwmw2 Exp $
+ *
+ * based on rpxlite.c
+ *
+ * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
+ *
+ * This code is GPLed
+ * 
+ */
+
+/*
+ * According to TQM8xxL hardware manual, TQM8xxL series have
+ * following flash memory organisations:
+ *	| capacity |	| chip type |	| bank0 |	| bank1 |
+ *	    2MiB	   512Kx16	  2MiB		   0
+ *	    4MiB	   1Mx16	  4MiB		   0
+ *	    8MiB	   1Mx16	  4MiB		   4MiB
+ * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at 
+ * kernel configuration.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/partitions.h>
+
+#define FLASH_ADDR 0x40000000
+#define FLASH_SIZE 0x00800000
+#define FLASH_BANK_MAX 4
+
+// trivial struct to describe partition information
+struct mtd_part_def
+{
+	int nums;
+	unsigned char *type;
+	struct mtd_partition* mtd_part;
+};
+
+//static struct mtd_info *mymtd;
+static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
+static struct map_info* map_banks[FLASH_BANK_MAX];
+static struct mtd_part_def part_banks[FLASH_BANK_MAX];
+static unsigned long num_banks;
+static unsigned long start_scan_addr;
+
+__u8 tqm8xxl_read8(struct map_info *map, unsigned long ofs)
+{
+	return *((__u8 *)(map->map_priv_1 + ofs));
+}
+
+__u16 tqm8xxl_read16(struct map_info *map, unsigned long ofs)
+{
+	return *((__u16 *)(map->map_priv_1 + ofs));
+}
+
+__u32 tqm8xxl_read32(struct map_info *map, unsigned long ofs)
+{
+	return *((__u32 *)(map->map_priv_1 + ofs));
+}
+
+void tqm8xxl_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	memcpy_fromio(to, (void *)(map->map_priv_1 + from), len);
+}
+
+void tqm8xxl_write8(struct map_info *map, __u8 d, unsigned long adr)
+{
+	*((__u8 *)(map->map_priv_1 + adr)) = d;
+}
+
+void tqm8xxl_write16(struct map_info *map, __u16 d, unsigned long adr)
+{
+	*((__u16 *)( map->map_priv_1 + adr)) = d;
+}
+
+void tqm8xxl_write32(struct map_info *map, __u32 d, unsigned long adr)
+{
+	*((__u32 *)(map->map_priv_1 + adr)) = d;
+}
+
+void tqm8xxl_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
+{
+	memcpy_toio((void *)(map->map_priv_1 + to), from, len);
+}
+
+struct map_info tqm8xxl_map = {
+	name: "TQM8xxL",
+	//size: WINDOW_SIZE,
+	buswidth: 4,
+	read8: tqm8xxl_read8,
+	read16: tqm8xxl_read16,
+	read32: tqm8xxl_read32,
+	copy_from: tqm8xxl_copy_from,
+	write8: tqm8xxl_write8,
+	write16: tqm8xxl_write16,
+	write32: tqm8xxl_write32,
+	copy_to: tqm8xxl_copy_to
+};
+
+/*
+ * Here are partition information for all known TQM8xxL series devices.
+ * See include/linux/mtd/partitions.h for definition of the mtd_partition
+ * structure.
+ * 
+ * The *_max_flash_size is the maximum possible mapped flash size which
+ * is not necessarily the actual flash size.  It must correspond to the 
+ * value specified in the mapping definition defined by the
+ * "struct map_desc *_io_desc" for the corresponding machine.
+ */
+
+#ifdef CONFIG_MTD_PARTITIONS
+/* Currently, TQM8xxL has upto 8MiB flash */
+static unsigned long tqm8xxl_max_flash_size = 0x00800000;
+
+/* partition definition for first flash bank
+ * also ref. to "drivers\char\flash_config.c" 
+ */
+static struct mtd_partition tqm8xxl_partitions[] = {
+	{
+	  name: "ppcboot",
+	  offset: 0x00000000,
+	  size: 0x00020000,           /* 128KB           */
+	  mask_flags: MTD_WRITEABLE,  /* force read-only */
+	},
+	{
+	  name: "kernel",             /* default kernel image */
+	  offset: 0x00020000,
+	  size: 0x000e0000,
+	  mask_flags: MTD_WRITEABLE,  /* force read-only */
+	},
+	{
+	  name: "user",
+	  offset: 0x00100000,
+	  size: 0x00100000,
+	},
+	{
+	  name: "initrd",
+	  offset: 0x00200000,
+	  size: 0x00200000,
+	}
+};
+/* partition definition for second flahs bank */
+static struct mtd_partition tqm8xxl_fs_partitions[] = {
+	{
+	  name: "cramfs",
+	  offset: 0x00000000,
+	  size: 0x00200000,
+	},
+	{
+	  name: "jffs",
+	  offset: 0x00200000,
+	  size: 0x00200000,
+	  //size: MTDPART_SIZ_FULL,
+	}
+};
+#endif
+
+#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
+
+int __init init_tqm_mtd(void)
+{
+	int idx = 0, ret = 0;
+	unsigned long flash_addr, flash_size, mtd_size = 0;
+	/* pointer to TQM8xxL board info data */
+	bd_t *bd = (bd_t *)__res;
+
+	flash_addr = bd->bi_flashstart;
+	flash_size = bd->bi_flashsize;
+	//request maximum flash size address spzce
+	start_scan_addr = (unsigned long)ioremap(flash_addr, flash_size);
+	if (!start_scan_addr) {
+		//printk("%s:Failed to ioremap address:0x%x\n", __FUNCTION__, FLASH_ADDR);
+		printk("%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
+		return -EIO;
+	}
+	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++)
+	{
+		if(mtd_size >= flash_size)
+			break;
+		
+		printk("%s: chip probing count %d\n", __FUNCTION__, idx);
+		
+		map_banks[idx] = (struct map_info *)kmalloc(sizeof(struct map_info), GFP_KERNEL);
+		if(map_banks[idx] == NULL)
+		{
+			//return -ENOMEM;
+			ret = -ENOMEM;
+			goto error_mem;
+		}
+		memset((void *)map_banks[idx], 0, sizeof(struct map_info));
+		map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
+		if(map_banks[idx]->name == NULL)
+		{
+			//return -ENOMEM;
+			ret = -ENOMEM;
+			goto error_mem;
+		}
+		memset((void *)map_banks[idx]->name, 0, 16);
+		
+		sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
+		map_banks[idx]->buswidth = 4;
+		map_banks[idx]->read8 = tqm8xxl_read8;
+		map_banks[idx]->read16 = tqm8xxl_read16;
+		map_banks[idx]->read32 = tqm8xxl_read32;
+		map_banks[idx]->copy_from = tqm8xxl_copy_from;
+		map_banks[idx]->write8 = tqm8xxl_write8;
+		map_banks[idx]->write16 = tqm8xxl_write16;
+		map_banks[idx]->write32 = tqm8xxl_write32;
+		map_banks[idx]->copy_to = tqm8xxl_copy_to;
+		map_banks[idx]->map_priv_1 = 
+		start_scan_addr + ((idx > 0) ? 
+		(mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
+		//start to probe flash chips
+		mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
+		if(mtd_banks[idx])
+		{
+			mtd_banks[idx]->module = THIS_MODULE;
+			mtd_size += mtd_banks[idx]->size;
+			num_banks++;
+			printk("%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks, 
+			mtd_banks[idx]->name, mtd_banks[idx]->size);
+		}
+	}
+
+	/* no supported flash chips found */
+	if(!num_banks)
+	{
+		printk("TQM8xxL: No support flash chips found!\n");
+		ret = -ENXIO;
+		goto error_mem;
+	}
+
+#ifdef CONFIG_MTD_PARTITIONS
+	/*
+	 * Select Static partition definitions
+	 */
+	part_banks[0].mtd_part = tqm8xxl_partitions;
+	part_banks[0].type = "Static image";
+	part_banks[0].nums = NB_OF(tqm8xxl_partitions);
+	part_banks[1].mtd_part = tqm8xxl_fs_partitions;
+	part_banks[1].type = "Static file system";
+	part_banks[1].nums = NB_OF(tqm8xxl_fs_partitions);
+	for(idx = 0; idx < num_banks ; idx++)
+	{
+		if (part_banks[idx].nums == 0) {
+			printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
+			add_mtd_device(mtd_banks[idx]);
+		} else {
+			printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
+					idx, part_banks[idx].type);
+			add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part, 
+								part_banks[idx].nums);
+		}
+	}
+#else
+	printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
+	for(idx = 0 ; idx < num_banks ; idx++)
+		add_mtd_device(mtd_banks[idx]);
+#endif
+	return 0;
+error_mem:
+	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++)
+	{
+		if(map_banks[idx] != NULL)
+		{
+			if(map_banks[idx]->name != NULL)
+			{
+				kfree(map_banks[idx]->name);
+				map_banks[idx]->name = NULL;
+			}
+			kfree(map_banks[idx]);
+			map_banks[idx] = NULL;
+		}
+	}
+	//return -ENOMEM;
+error:
+	iounmap((void *)start_scan_addr);
+	//return -ENXIO;
+	return ret;
+}
+
+static void __exit cleanup_tqm_mtd(void)
+{
+	unsigned int idx = 0;
+	for(idx = 0 ; idx < num_banks ; idx++)
+	{
+		/* destroy mtd_info previously allocated */
+		if (mtd_banks[idx]) {
+			del_mtd_partitions(mtd_banks[idx]);
+			map_destroy(mtd_banks[idx]);
+		}
+		/* release map_info not used anymore */
+		kfree(map_banks[idx]->name);
+		kfree(map_banks[idx]);
+	}
+	if (start_scan_addr) {
+		iounmap((void *)start_scan_addr);
+		start_scan_addr = 0;
+	}
+}
+
+module_init(init_tqm_mtd);
+module_exit(cleanup_tqm_mtd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
+MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");