drivers/mtd/maps/amd76xrom.c - linux - Git at Google

 /*
  * amd76xrom.c
  *
  * Normal mappings of chips in physical memory
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <asm/io.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
 #include <linux/mtd/cfi.h>
 #include <linux/mtd/flashchip.h>
 #include <linux/pci.h>
 #include <linux/pci_ids.h>
 #include <linux/list.h>


 #define xstr(s) str(s)
 #define str(s) #s
 #define MOD_NAME xstr(KBUILD_BASENAME)

 #define ADDRESS_NAME_LEN 18

 #define ROM_PROBE_STEP_SIZE (64*1024) /* 64KiB */

 struct amd76xrom_window {
 	void __iomem *virt;
 	unsigned long phys;
 	unsigned long size;
 	struct list_head maps;
 	struct resource rsrc;
 	struct pci_dev *pdev;
 };

 struct amd76xrom_map_info {
 	struct list_head list;
 	struct map_info map;
 	struct mtd_info *mtd;
 	struct resource rsrc;
 	char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
 };

 /* The 2 bits controlling the window size are often set to allow reading
  * the BIOS, but too small to allow writing, since the lock registers are
  * 4MiB lower in the address space than the data.
  *
  * This is intended to prevent flashing the bios, perhaps accidentally.
  *
  * This parameter allows the normal driver to over-ride the BIOS settings.
  *
  * The bits are 6 and 7.  If both bits are set, it is a 5MiB window.
  * If only the 7 Bit is set, it is a 4MiB window.  Otherwise, a
  * 64KiB window.
  *
  */
 static uint win_size_bits;
 module_param(win_size_bits, uint, 0);
 MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");

 static struct amd76xrom_window amd76xrom_window = {
 	.maps = LIST_HEAD_INIT(amd76xrom_window.maps),
 };

 static void amd76xrom_cleanup(struct amd76xrom_window *window)
 {
 	struct amd76xrom_map_info *map, *scratch;
 	u8 byte;

 	if (window->pdev) {
 		/* Disable writes through the rom window */
 		pci_read_config_byte(window->pdev, 0x40, &byte);
 		pci_write_config_byte(window->pdev, 0x40, byte & ~1);
 		pci_dev_put(window->pdev);
 	}

 	/* Free all of the mtd devices */
 	list_for_each_entry_safe(map, scratch, &window->maps, list) {
 		if (map->rsrc.parent) {
 			release_resource(&map->rsrc);
 		}
 		del_mtd_device(map->mtd);
 		map_destroy(map->mtd);
 		list_del(&map->list);
 		kfree(map);
 	}
 	if (window->rsrc.parent)
 		release_resource(&window->rsrc);

 	if (window->virt) {
 		iounmap(window->virt);
 		window->virt = NULL;
 		window->phys = 0;
 		window->size = 0;
 		window->pdev = NULL;
 	}
 }


 static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
 	const struct pci_device_id *ent)
 {
 	static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
 	u8 byte;
 	struct amd76xrom_window *window = &amd76xrom_window;
 	struct amd76xrom_map_info *map = NULL;
 	unsigned long map_top;

 	/* Remember the pci dev I find the window in - already have a ref */
 	window->pdev = pdev;

 	/* Enable the selected rom window.  This is often incorrectly
 	 * set up by the BIOS, and the 4MiB offset for the lock registers
 	 * requires the full 5MiB of window space.
 	 *
 	 * This 'write, then read' approach leaves the bits for
 	 * other uses of the hardware info.
 	 */
 	pci_read_config_byte(pdev, 0x43, &byte);
 	pci_write_config_byte(pdev, 0x43, byte | win_size_bits );

 	/* Assume the rom window is properly setup, and find it's size */
 	pci_read_config_byte(pdev, 0x43, &byte);
 	if ((byte & ((1<<7)|(1<<6))) == ((1<<7)|(1<<6))) {
 		window->phys = 0xffb00000; /* 5MiB */
 	}
 	else if ((byte & (1<<7)) == (1<<7)) {
 		window->phys = 0xffc00000; /* 4MiB */
 	}
 	else {
 		window->phys = 0xffff0000; /* 64KiB */
 	}
 	window->size = 0xffffffffUL - window->phys + 1UL;

 	/*
 	 * Try to reserve the window mem region.  If this fails then
 	 * it is likely due to a fragment of the window being
 	 * "reseved" by the BIOS.  In the case that the
 	 * request_mem_region() fails then once the rom size is
 	 * discovered we will try to reserve the unreserved fragment.
 	 */
 	window->rsrc.name = MOD_NAME;
 	window->rsrc.start = window->phys;
 	window->rsrc.end   = window->phys + window->size - 1;
 	window->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 	if (request_resource(&iomem_resource, &window->rsrc)) {
 		window->rsrc.parent = NULL;
 		printk(KERN_ERR MOD_NAME
 		       " %s(): Unable to register resource %pR - kernel bug?\n",
 		       __func__, &window->rsrc);
 		return -EBUSY;
 	}


 	/* Enable writes through the rom window */
 	pci_read_config_byte(pdev, 0x40, &byte);
 	pci_write_config_byte(pdev, 0x40, byte | 1);

 	/* FIXME handle registers 0x80 - 0x8C the bios region locks */

 	/* For write accesses caches are useless */
 	window->virt = ioremap_nocache(window->phys, window->size);
 	if (!window->virt) {
 		printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
 			window->phys, window->size);
 		goto out;
 	}

 	/* Get the first address to look for an rom chip at */
 	map_top = window->phys;
 #if 1
 	/* The probe sequence run over the firmware hub lock
 	 * registers sets them to 0x7 (no access).
 	 * Probe at most the last 4M of the address space.
 	 */
 	if (map_top < 0xffc00000) {
 		map_top = 0xffc00000;
 	}
 #endif
 	/* Loop  through and look for rom chips */
 	while((map_top - 1) < 0xffffffffUL) {
 		struct cfi_private *cfi;
 		unsigned long offset;
 		int i;

 		if (!map) {
 			map = kmalloc(sizeof(*map), GFP_KERNEL);
 		}
 		if (!map) {
 			printk(KERN_ERR MOD_NAME ": kmalloc failed");
 			goto out;
 		}
 		memset(map, 0, sizeof(*map));
 		INIT_LIST_HEAD(&map->list);
 		map->map.name = map->map_name;
 		map->map.phys = map_top;
 		offset = map_top - window->phys;
 		map->map.virt = (void __iomem *)
 			(((unsigned long)(window->virt)) + offset);
 		map->map.size = 0xffffffffUL - map_top + 1UL;
 		/* Set the name of the map to the address I am trying */
 		sprintf(map->map_name, "%s @%08Lx",
 			MOD_NAME, (unsigned long long)map->map.phys);

 		/* There is no generic VPP support */
 		for(map->map.bankwidth = 32; map->map.bankwidth;
 			map->map.bankwidth >>= 1)
 		{
 			char **probe_type;
 			/* Skip bankwidths that are not supported */
 			if (!map_bankwidth_supported(map->map.bankwidth))
 				continue;

 			/* Setup the map methods */
 			simple_map_init(&map->map);

 			/* Try all of the probe methods */
 			probe_type = rom_probe_types;
 			for(; *probe_type; probe_type++) {
 				map->mtd = do_map_probe(*probe_type, &map->map);
 				if (map->mtd)
 					goto found;
 			}
 		}
 		map_top += ROM_PROBE_STEP_SIZE;
 		continue;
 	found:
 		/* Trim the size if we are larger than the map */
 		if (map->mtd->size > map->map.size) {
 			printk(KERN_WARNING MOD_NAME
 				" rom(%llu) larger than window(%lu). fixing...\n",
 				(unsigned long long)map->mtd->size, map->map.size);
 			map->mtd->size = map->map.size;
 		}
 		if (window->rsrc.parent) {
 			/*
 			 * Registering the MTD device in iomem may not be possible
 			 * if there is a BIOS "reserved" and BUSY range.  If this
 			 * fails then continue anyway.
 			 */
 			map->rsrc.name  = map->map_name;
 			map->rsrc.start = map->map.phys;
 			map->rsrc.end   = map->map.phys + map->mtd->size - 1;
 			map->rsrc.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 			if (request_resource(&window->rsrc, &map->rsrc)) {
 				printk(KERN_ERR MOD_NAME
 					": cannot reserve MTD resource\n");
 				map->rsrc.parent = NULL;
 			}
 		}

 		/* Make the whole region visible in the map */
 		map->map.virt = window->virt;
 		map->map.phys = window->phys;
 		cfi = map->map.fldrv_priv;
 		for(i = 0; i < cfi->numchips; i++) {
 			cfi->chips[i].start += offset;
 		}

 		/* Now that the mtd devices is complete claim and export it */
 		map->mtd->owner = THIS_MODULE;
 		if (add_mtd_device(map->mtd)) {
 			map_destroy(map->mtd);
 			map->mtd = NULL;
 			goto out;
 		}


 		/* Calculate the new value of map_top */
 		map_top += map->mtd->size;

 		/* File away the map structure */
 		list_add(&map->list, &window->maps);
 		map = NULL;
 	}

  out:
 	/* Free any left over map structures */
 	kfree(map);
 	/* See if I have any map structures */
 	if (list_empty(&window->maps)) {
 		amd76xrom_cleanup(window);
 		return -ENODEV;
 	}
 	return 0;
 }


 static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
 {
 	struct amd76xrom_window *window = &amd76xrom_window;

 	amd76xrom_cleanup(window);
 }

 static struct pci_device_id amd76xrom_pci_tbl[] = {
 	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
 		PCI_ANY_ID, PCI_ANY_ID, },
 	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
 		PCI_ANY_ID, PCI_ANY_ID, },
 	{ PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
 	{ 0, }
 };

 MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);

 #if 0
 static struct pci_driver amd76xrom_driver = {
 	.name =		MOD_NAME,
 	.id_table =	amd76xrom_pci_tbl,
 	.probe =	amd76xrom_init_one,
 	.remove =	amd76xrom_remove_one,
 };
 #endif

 static int __init init_amd76xrom(void)
 {
 	struct pci_dev *pdev;
 	struct pci_device_id *id;
 	pdev = NULL;
 	for(id = amd76xrom_pci_tbl; id->vendor; id++) {
 		pdev = pci_get_device(id->vendor, id->device, NULL);
 		if (pdev) {
 			break;
 		}
 	}
 	if (pdev) {
 		return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
 	}
 	return -ENXIO;
 #if 0
 	return pci_register_driver(&amd76xrom_driver);
 #endif
 }

 static void __exit cleanup_amd76xrom(void)
 {
 	amd76xrom_remove_one(amd76xrom_window.pdev);
 }

 module_init(init_amd76xrom);
 module_exit(cleanup_amd76xrom);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
 MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");
	/*
	* amd76xrom.c
	*
	* Normal mappings of chips in physical memory
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <asm/io.h>
	#include <linux/mtd/mtd.h>
	#include <linux/mtd/map.h>
	#include <linux/mtd/cfi.h>
	#include <linux/mtd/flashchip.h>
	#include <linux/pci.h>
	#include <linux/pci_ids.h>
	#include <linux/list.h>


	#define xstr(s) str(s)
	#define str(s) #s
	#define MOD_NAME xstr(KBUILD_BASENAME)

	#define ADDRESS_NAME_LEN 18

	#define ROM_PROBE_STEP_SIZE (641024) / 64KiB */

	struct amd76xrom_window {
	void __iomem *virt;
	unsigned long phys;
	unsigned long size;
	struct list_head maps;
	struct resource rsrc;
	struct pci_dev *pdev;
	};

	struct amd76xrom_map_info {
	struct list_head list;
	struct map_info map;
	struct mtd_info *mtd;
	struct resource rsrc;
	char map_name[sizeof(MOD_NAME) + 2 + ADDRESS_NAME_LEN];
	};

	/* The 2 bits controlling the window size are often set to allow reading
	* the BIOS, but too small to allow writing, since the lock registers are
	* 4MiB lower in the address space than the data.
	*
	* This is intended to prevent flashing the bios, perhaps accidentally.
	*
	* This parameter allows the normal driver to over-ride the BIOS settings.
	*
	* The bits are 6 and 7. If both bits are set, it is a 5MiB window.
	* If only the 7 Bit is set, it is a 4MiB window. Otherwise, a
	* 64KiB window.
	*
	*/
	static uint win_size_bits;
	module_param(win_size_bits, uint, 0);
	MODULE_PARM_DESC(win_size_bits, "ROM window size bits override for 0x43 byte, normally set by BIOS.");

	static struct amd76xrom_window amd76xrom_window = {
	.maps = LIST_HEAD_INIT(amd76xrom_window.maps),
	};

	static void amd76xrom_cleanup(struct amd76xrom_window *window)
	{
	struct amd76xrom_map_info map, scratch;
	u8 byte;

	if (window->pdev) {
	/* Disable writes through the rom window */
	pci_read_config_byte(window->pdev, 0x40, &byte);
	pci_write_config_byte(window->pdev, 0x40, byte & ~1);
	pci_dev_put(window->pdev);
	}

	/* Free all of the mtd devices */
	list_for_each_entry_safe(map, scratch, &window->maps, list) {
	if (map->rsrc.parent) {
	release_resource(&map->rsrc);
	}
	del_mtd_device(map->mtd);
	map_destroy(map->mtd);
	list_del(&map->list);
	kfree(map);
	}
	if (window->rsrc.parent)
	release_resource(&window->rsrc);

	if (window->virt) {
	iounmap(window->virt);
	window->virt = NULL;
	window->phys = 0;
	window->size = 0;
	window->pdev = NULL;
	}
	}


	static int __devinit amd76xrom_init_one (struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	static char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
	u8 byte;
	struct amd76xrom_window *window = &amd76xrom_window;
	struct amd76xrom_map_info *map = NULL;
	unsigned long map_top;

	/* Remember the pci dev I find the window in - already have a ref */
	window->pdev = pdev;

	/* Enable the selected rom window. This is often incorrectly
	* set up by the BIOS, and the 4MiB offset for the lock registers
	* requires the full 5MiB of window space.
	*
	* This 'write, then read' approach leaves the bits for
	* other uses of the hardware info.
	*/
	pci_read_config_byte(pdev, 0x43, &byte);
	pci_write_config_byte(pdev, 0x43, byte \| win_size_bits );

	/* Assume the rom window is properly setup, and find it's size */
	pci_read_config_byte(pdev, 0x43, &byte);
	if ((byte & ((1<<7)\|(1<<6))) == ((1<<7)\|(1<<6))) {
	window->phys = 0xffb00000; /* 5MiB */
	}
	else if ((byte & (1<<7)) == (1<<7)) {
	window->phys = 0xffc00000; /* 4MiB */
	}
	else {
	window->phys = 0xffff0000; /* 64KiB */
	}
	window->size = 0xffffffffUL - window->phys + 1UL;

	/*
	* Try to reserve the window mem region. If this fails then
	* it is likely due to a fragment of the window being
	* "reseved" by the BIOS. In the case that the
	* request_mem_region() fails then once the rom size is
	* discovered we will try to reserve the unreserved fragment.
	*/
	window->rsrc.name = MOD_NAME;
	window->rsrc.start = window->phys;
	window->rsrc.end = window->phys + window->size - 1;
	window->rsrc.flags = IORESOURCE_MEM \| IORESOURCE_BUSY;
	if (request_resource(&iomem_resource, &window->rsrc)) {
	window->rsrc.parent = NULL;
	printk(KERN_ERR MOD_NAME
	" %s(): Unable to register resource %pR - kernel bug?\n",
	__func__, &window->rsrc);
	return -EBUSY;
	}


	/* Enable writes through the rom window */
	pci_read_config_byte(pdev, 0x40, &byte);
	pci_write_config_byte(pdev, 0x40, byte \| 1);

	/* FIXME handle registers 0x80 - 0x8C the bios region locks */

	/* For write accesses caches are useless */
	window->virt = ioremap_nocache(window->phys, window->size);
	if (!window->virt) {
	printk(KERN_ERR MOD_NAME ": ioremap(%08lx, %08lx) failed\n",
	window->phys, window->size);
	goto out;
	}

	/* Get the first address to look for an rom chip at */
	map_top = window->phys;
	#if 1
	/* The probe sequence run over the firmware hub lock
	* registers sets them to 0x7 (no access).
	* Probe at most the last 4M of the address space.
	*/
	if (map_top < 0xffc00000) {
	map_top = 0xffc00000;
	}
	#endif
	/* Loop through and look for rom chips */
	while((map_top - 1) < 0xffffffffUL) {
	struct cfi_private *cfi;
	unsigned long offset;
	int i;

	if (!map) {
	map = kmalloc(sizeof(*map), GFP_KERNEL);
	}
	if (!map) {
	printk(KERN_ERR MOD_NAME ": kmalloc failed");
	goto out;
	}
	memset(map, 0, sizeof(*map));
	INIT_LIST_HEAD(&map->list);
	map->map.name = map->map_name;
	map->map.phys = map_top;
	offset = map_top - window->phys;
	map->map.virt = (void __iomem *)
	(((unsigned long)(window->virt)) + offset);
	map->map.size = 0xffffffffUL - map_top + 1UL;
	/* Set the name of the map to the address I am trying */
	sprintf(map->map_name, "%s @%08Lx",
	MOD_NAME, (unsigned long long)map->map.phys);

	/* There is no generic VPP support */
	for(map->map.bankwidth = 32; map->map.bankwidth;
	map->map.bankwidth >>= 1)
	{
	char **probe_type;
	/* Skip bankwidths that are not supported */
	if (!map_bankwidth_supported(map->map.bankwidth))
	continue;

	/* Setup the map methods */
	simple_map_init(&map->map);

	/* Try all of the probe methods */
	probe_type = rom_probe_types;
	for(; *probe_type; probe_type++) {
	map->mtd = do_map_probe(*probe_type, &map->map);
	if (map->mtd)
	goto found;
	}
	}
	map_top += ROM_PROBE_STEP_SIZE;
	continue;
	found:
	/* Trim the size if we are larger than the map */
	if (map->mtd->size > map->map.size) {
	printk(KERN_WARNING MOD_NAME
	" rom(%llu) larger than window(%lu). fixing...\n",
	(unsigned long long)map->mtd->size, map->map.size);
	map->mtd->size = map->map.size;
	}
	if (window->rsrc.parent) {
	/*
	* Registering the MTD device in iomem may not be possible
	* if there is a BIOS "reserved" and BUSY range. If this
	* fails then continue anyway.
	*/
	map->rsrc.name = map->map_name;
	map->rsrc.start = map->map.phys;
	map->rsrc.end = map->map.phys + map->mtd->size - 1;
	map->rsrc.flags = IORESOURCE_MEM \| IORESOURCE_BUSY;
	if (request_resource(&window->rsrc, &map->rsrc)) {
	printk(KERN_ERR MOD_NAME
	": cannot reserve MTD resource\n");
	map->rsrc.parent = NULL;
	}
	}

	/* Make the whole region visible in the map */
	map->map.virt = window->virt;
	map->map.phys = window->phys;
	cfi = map->map.fldrv_priv;
	for(i = 0; i < cfi->numchips; i++) {
	cfi->chips[i].start += offset;
	}

	/* Now that the mtd devices is complete claim and export it */
	map->mtd->owner = THIS_MODULE;
	if (add_mtd_device(map->mtd)) {
	map_destroy(map->mtd);
	map->mtd = NULL;
	goto out;
	}


	/* Calculate the new value of map_top */
	map_top += map->mtd->size;

	/* File away the map structure */
	list_add(&map->list, &window->maps);
	map = NULL;
	}

	out:
	/* Free any left over map structures */
	kfree(map);
	/* See if I have any map structures */
	if (list_empty(&window->maps)) {
	amd76xrom_cleanup(window);
	return -ENODEV;
	}
	return 0;
	}


	static void __devexit amd76xrom_remove_one (struct pci_dev *pdev)
	{
	struct amd76xrom_window *window = &amd76xrom_window;

	amd76xrom_cleanup(window);
	}

	static struct pci_device_id amd76xrom_pci_tbl[] = {
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410,
	PCI_ANY_ID, PCI_ANY_ID, },
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7440,
	PCI_ANY_ID, PCI_ANY_ID, },
	{ PCI_VENDOR_ID_AMD, 0x7468 }, /* amd8111 support */
	{ 0, }
	};

	MODULE_DEVICE_TABLE(pci, amd76xrom_pci_tbl);

	#if 0
	static struct pci_driver amd76xrom_driver = {
	.name = MOD_NAME,
	.id_table = amd76xrom_pci_tbl,
	.probe = amd76xrom_init_one,
	.remove = amd76xrom_remove_one,
	};
	#endif

	static int __init init_amd76xrom(void)
	{
	struct pci_dev *pdev;
	struct pci_device_id *id;
	pdev = NULL;
	for(id = amd76xrom_pci_tbl; id->vendor; id++) {
	pdev = pci_get_device(id->vendor, id->device, NULL);
	if (pdev) {
	break;
	}
	}
	if (pdev) {
	return amd76xrom_init_one(pdev, &amd76xrom_pci_tbl[0]);
	}
	return -ENXIO;
	#if 0
	return pci_register_driver(&amd76xrom_driver);
	#endif
	}

	static void __exit cleanup_amd76xrom(void)
	{
	amd76xrom_remove_one(amd76xrom_window.pdev);
	}

	module_init(init_amd76xrom);
	module_exit(cleanup_amd76xrom);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Eric Biederman <ebiederman@lnxi.com>");
	MODULE_DESCRIPTION("MTD map driver for BIOS chips on the AMD76X southbridge");