patch-2.4.6 linux/drivers/mtd/devices/mtdram.c

• Lines: 179
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/devices/mtdram.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/devices/mtdram.c linux/drivers/mtd/devices/mtdram.c
@@ -0,0 +1,178 @@
+/*
+ * mtdram - a test mtd device
+ * $Id: mtdram.c,v 1.24 2001/06/09 23:09:23 dwmw2 Exp $
+ * Author: Alexander Larsson <alex@cendio.se>
+ *
+ * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
+ *
+ * This code is GPL
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ioport.h>
+#include <linux/mtd/compatmac.h>
+#include <linux/mtd/mtd.h>
+
+#ifndef CONFIG_MTDRAM_ABS_POS
+  #define CONFIG_MTDRAM_ABS_POS 0
+#endif
+
+#if CONFIG_MTDRAM_ABS_POS > 0
+  #include <asm/io.h>
+#endif
+
+#ifdef MODULE
+static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
+static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
+MODULE_PARM(total_size,"l");
+MODULE_PARM(erase_size,"l");
+#define MTDRAM_TOTAL_SIZE (total_size * 1024)
+#define MTDRAM_ERASE_SIZE (erase_size * 1024)
+#else
+#define MTDRAM_TOTAL_SIZE (CONFIG_MTDRAM_TOTAL_SIZE * 1024)
+#define MTDRAM_ERASE_SIZE (CONFIG_MTDRAM_ERASE_SIZE * 1024)
+#endif
+
+
+// We could store these in the mtd structure, but we only support 1 device..
+static struct mtd_info *mtd_info;
+
+
+static int
+ram_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+  DEBUG(MTD_DEBUG_LEVEL2, "ram_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len);
+  if (instr->addr + instr->len > mtd->size) {
+    DEBUG(MTD_DEBUG_LEVEL1, "ram_erase() out of bounds (%ld > %ld)\n", (long)(instr->addr + instr->len), (long)mtd->size);
+    return -EINVAL;
+  }
+	
+  memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
+	
+  instr->state = MTD_ERASE_DONE;
+
+  if (instr->callback)
+    (*(instr->callback))(instr);
+  return 0;
+}
+
+static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
+{
+  if (from + len > mtd->size)
+    return -EINVAL;
+	
+  *mtdbuf = mtd->priv + from;
+  *retlen = len;
+  return 0;
+}
+
+static void ram_unpoint (struct mtd_info *mtd, u_char *addr)
+{
+  DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n");
+}
+
+static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
+	     size_t *retlen, u_char *buf)
+{
+  DEBUG(MTD_DEBUG_LEVEL2, "ram_read(pos:%ld, len:%ld)\n", (long)from, (long)len);
+  if (from + len > mtd->size) {
+    DEBUG(MTD_DEBUG_LEVEL1, "ram_read() out of bounds (%ld > %ld)\n", (long)(from + len), (long)mtd->size);
+    return -EINVAL;
+  }
+
+  memcpy(buf, mtd->priv + from, len);
+
+  *retlen=len;
+  return 0;
+}
+
+static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
+	      size_t *retlen, const u_char *buf)
+{
+  DEBUG(MTD_DEBUG_LEVEL2, "ram_write(pos:%ld, len:%ld)\n", (long)to, (long)len);
+  if (to + len > mtd->size) {
+    DEBUG(MTD_DEBUG_LEVEL1, "ram_write() out of bounds (%ld > %ld)\n", (long)(to + len), (long)mtd->size);
+    return -EINVAL;
+  }
+
+  memcpy ((char *)mtd->priv + to, buf, len);
+
+  *retlen=len;
+  return 0;
+}
+
+#if LINUX_VERSION_CODE < 0x20212 && defined(MODULE)
+#define init_mtdram init_module
+#define cleanup_mtdram cleanup_module
+#endif
+
+//static void __exit cleanup_mtdram(void)
+mod_exit_t cleanup_mtdram(void)
+{
+  if (mtd_info) {
+    del_mtd_device(mtd_info);
+    if (mtd_info->priv)
+#if CONFIG_MTDRAM_ABS_POS > 0
+      iounmap(mtd_info->priv);
+#else
+      vfree(mtd_info->priv);
+#endif	
+    kfree(mtd_info);
+  }
+}
+
+mod_init_t init_mtdram(void)
+{
+   // Allocate some memory
+   mtd_info = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
+   if (!mtd_info)
+      return 0;
+   
+   memset(mtd_info, 0, sizeof(*mtd_info));
+
+   // Setup the MTD structure
+   mtd_info->name = "mtdram test device";
+   mtd_info->type = MTD_RAM;
+   mtd_info->flags = MTD_CAP_RAM;
+   mtd_info->size = MTDRAM_TOTAL_SIZE;
+   mtd_info->erasesize = MTDRAM_ERASE_SIZE;
+#if CONFIG_MTDRAM_ABS_POS > 0
+   mtd_info->priv = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE);
+#else
+   mtd_info->priv = vmalloc(MTDRAM_TOTAL_SIZE);
+#endif
+
+   if (!mtd_info->priv) {
+     DEBUG(MTD_DEBUG_LEVEL1, "Failed to vmalloc(/ioremap) memory region of size %ld (ABS_POS:%ld)\n", (long)MTDRAM_TOTAL_SIZE, (long)CONFIG_MTDRAM_ABS_POS);
+     kfree(mtd_info);
+     mtd_info = NULL;
+     return -ENOMEM;
+   }
+   memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
+
+   mtd_info->module = THIS_MODULE;			
+   mtd_info->erase = ram_erase;
+   mtd_info->point = ram_point;
+   mtd_info->unpoint = ram_unpoint;
+   mtd_info->read = ram_read;
+   mtd_info->write = ram_write;
+
+   if (add_mtd_device(mtd_info)) {
+#if CONFIG_MTDRAM_ABS_POS > 0
+     iounmap(mtd_info->priv);
+#else
+     vfree(mtd_info->priv);
+#endif	
+     kfree(mtd_info);
+     mtd_info = NULL;
+     return -EIO;
+   }
+   
+   return 0;
+}
+
+module_init(init_mtdram);
+module_exit(cleanup_mtdram);