[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pci / rom.c

/*
 * drivers/pci/rom.c
 *
 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
 *
 * PCI ROM access routines
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/pci.h>

#include "pci.h"

/**
 * pci_enable_rom - enable ROM decoding for a PCI device
 * @pdev: PCI device to enable
 *
 * Enable ROM decoding on @dev.  This involves simply turning on the last
 * bit of the PCI ROM BAR.  Note that some cards may share address decoders
 * between the ROM and other resources, so enabling it may disable access
 * to MMIO registers or other card memory.
 */
static void pci_enable_rom(struct pci_dev *pdev)
{
	u32 rom_addr;

	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
	rom_addr |= PCI_ROM_ADDRESS_ENABLE;
	pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
}

/**
 * pci_disable_rom - disable ROM decoding for a PCI device
 * @pdev: PCI device to disable
 *
 * Disable ROM decoding on a PCI device by turning off the last bit in the
 * ROM BAR.
 */
static void pci_disable_rom(struct pci_dev *pdev)
{
	u32 rom_addr;
	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
	rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;
	pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
}

/**
 * pci_map_rom - map a PCI ROM to kernel space
 * @pdev: pointer to pci device struct
 * @size: pointer to receive size of pci window over ROM
 * @return: kernel virtual pointer to image of ROM
 *
 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
 * the shadow BIOS copy will be returned instead of the
 * actual ROM.
 */
void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
{
	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	loff_t start;
	void __iomem *rom;
	void __iomem *image;
	int last_image;

	/* IORESOURCE_ROM_SHADOW only set on x86 */
	if (res->flags & IORESOURCE_ROM_SHADOW) {
		/* primary video rom always starts here */
		start = (loff_t)0xC0000;
		*size = 0x20000; /* cover C000:0 through E000:0 */
	} else {
		if (res->flags & IORESOURCE_ROM_COPY) {
			*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
			return (void __iomem *)pci_resource_start(pdev, PCI_ROM_RESOURCE);
		} else {
			/* assign the ROM an address if it doesn't have one */
			if (res->parent == NULL)
				pci_assign_resource(pdev, PCI_ROM_RESOURCE);

			start = pci_resource_start(pdev, PCI_ROM_RESOURCE);
			*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
			if (*size == 0)
				return NULL;

			/* Enable ROM space decodes */
			pci_enable_rom(pdev);
		}
	}

	rom = ioremap(start, *size);
	if (!rom) {
		/* restore enable if ioremap fails */
		if (!(res->flags & (IORESOURCE_ROM_ENABLE |
				    IORESOURCE_ROM_SHADOW |
				    IORESOURCE_ROM_COPY)))
			pci_disable_rom(pdev);
		return NULL;
	}

	/*
	 * Try to find the true size of the ROM since sometimes the PCI window
	 * size is much larger than the actual size of the ROM.
	 * True size is important if the ROM is going to be copied.
	 */
	image = rom;
	do {
		void __iomem *pds;
		/* Standard PCI ROMs start out with these bytes 55 AA */
		if (readb(image) != 0x55)
			break;
		if (readb(image + 1) != 0xAA)
			break;
		/* get the PCI data structure and check its signature */
		pds = image + readw(image + 24);
		if (readb(pds) != 'P')
			break;
		if (readb(pds + 1) != 'C')
			break;
		if (readb(pds + 2) != 'I')
			break;
		if (readb(pds + 3) != 'R')
			break;
		last_image = readb(pds + 21) & 0x80;
		/* this length is reliable */
		image += readw(pds + 16) * 512;
	} while (!last_image);

	*size = image - rom;

	return rom;
}

/**
 * pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
 * @pdev: pointer to pci device struct
 * @size: pointer to receive size of pci window over ROM
 * @return: kernel virtual pointer to image of ROM
 *
 * Map a PCI ROM into kernel space. If ROM is boot video ROM,
 * the shadow BIOS copy will be returned instead of the
 * actual ROM.
 */
void __iomem *pci_map_rom_copy(struct pci_dev *pdev, size_t *size)
{
	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	void __iomem *rom;

	rom = pci_map_rom(pdev, size);
	if (!rom)
		return NULL;

	if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_SHADOW))
		return rom;

	res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
	if (!res->start)
		return rom;

	res->end = res->start + *size;
	memcpy_fromio((void*)res->start, rom, *size);
	pci_unmap_rom(pdev, rom);
	res->flags |= IORESOURCE_ROM_COPY;

	return (void __iomem *)res->start;
}

/**
 * pci_unmap_rom - unmap the ROM from kernel space
 * @pdev: pointer to pci device struct
 * @rom: virtual address of the previous mapping
 *
 * Remove a mapping of a previously mapped ROM
 */
void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
{
	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];

	if (res->flags & IORESOURCE_ROM_COPY)
		return;

	iounmap(rom);

	/* Disable again before continuing, leave enabled if pci=rom */
	if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
		pci_disable_rom(pdev);
}

/**
 * pci_remove_rom - disable the ROM and remove its sysfs attribute
 * @pdev: pointer to pci device struct
 *
 * Remove the rom file in sysfs and disable ROM decoding.
 */
void pci_remove_rom(struct pci_dev *pdev)
{
	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];

	if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
		sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
	if (!(res->flags & (IORESOURCE_ROM_ENABLE |
			    IORESOURCE_ROM_SHADOW |
			    IORESOURCE_ROM_COPY)))
		pci_disable_rom(pdev);
}

/**
 * pci_cleanup_rom - internal routine for freeing the ROM copy created
 * by pci_map_rom_copy called from remove.c
 * @pdev: pointer to pci device struct
 *
 * Free the copied ROM if we allocated one.
 */
void pci_cleanup_rom(struct pci_dev *pdev)
{
	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	if (res->flags & IORESOURCE_ROM_COPY) {
		kfree((void*)res->start);
		res->flags &= ~IORESOURCE_ROM_COPY;
		res->start = 0;
		res->end = 0;
	}
}

EXPORT_SYMBOL(pci_map_rom);
EXPORT_SYMBOL(pci_map_rom_copy);
EXPORT_SYMBOL(pci_unmap_rom);
EXPORT_SYMBOL(pci_remove_rom);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/pci/rom.c
	3	*
	4	* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
	5	* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
	6	*
	7	* PCI ROM access routines
	8	*/
	9	#include <linux/config.h>
	10	#include <linux/kernel.h>
	11	#include <linux/pci.h>
	12
	13	#include "pci.h"
	14
	15	/**
	16	* pci_enable_rom - enable ROM decoding for a PCI device
67be2dd1	17	* @pdev: PCI device to enable
1da177e4 LT	18	*
	19	* Enable ROM decoding on @dev. This involves simply turning on the last
	20	* bit of the PCI ROM BAR. Note that some cards may share address decoders
	21	* between the ROM and other resources, so enabling it may disable access
	22	* to MMIO registers or other card memory.
	23	*/
	24	static void pci_enable_rom(struct pci_dev *pdev)
	25	{
	26	u32 rom_addr;
	27
	28	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
	29	rom_addr \|= PCI_ROM_ADDRESS_ENABLE;
	30	pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
	31	}
	32
	33	/**
	34	* pci_disable_rom - disable ROM decoding for a PCI device
67be2dd1	35	* @pdev: PCI device to disable
1da177e4 LT	36	*
	37	* Disable ROM decoding on a PCI device by turning off the last bit in the
	38	* ROM BAR.
	39	*/
	40	static void pci_disable_rom(struct pci_dev *pdev)
	41	{
	42	u32 rom_addr;
	43	pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
	44	rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;
	45	pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
	46	}
	47
	48	/**
	49	* pci_map_rom - map a PCI ROM to kernel space
67be2dd1	50	* @pdev: pointer to pci device struct
1da177e4 LT	51	* @size: pointer to receive size of pci window over ROM
	52	* @return: kernel virtual pointer to image of ROM
	53	*
	54	* Map a PCI ROM into kernel space. If ROM is boot video ROM,
	55	* the shadow BIOS copy will be returned instead of the
	56	* actual ROM.
	57	*/
	58	void __iomem pci_map_rom(struct pci_dev pdev, size_t *size)
	59	{
	60	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	61	loff_t start;
	62	void __iomem *rom;
	63	void __iomem *image;
	64	int last_image;
	65
	66	/* IORESOURCE_ROM_SHADOW only set on x86 */
	67	if (res->flags & IORESOURCE_ROM_SHADOW) {
	68	/* primary video rom always starts here */
	69	start = (loff_t)0xC0000;
	70	size = 0x20000; / cover C000:0 through E000:0 */
	71	} else {
	72	if (res->flags & IORESOURCE_ROM_COPY) {
	73	*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
	74	return (void __iomem *)pci_resource_start(pdev, PCI_ROM_RESOURCE);
	75	} else {
	76	/* assign the ROM an address if it doesn't have one */
	77	if (res->parent == NULL)
	78	pci_assign_resource(pdev, PCI_ROM_RESOURCE);
	79
	80	start = pci_resource_start(pdev, PCI_ROM_RESOURCE);
	81	*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
	82	if (*size == 0)
	83	return NULL;
	84
	85	/* Enable ROM space decodes */
	86	pci_enable_rom(pdev);
	87	}
	88	}
	89
	90	rom = ioremap(start, *size);
	91	if (!rom) {
	92	/* restore enable if ioremap fails */
	93	if (!(res->flags & (IORESOURCE_ROM_ENABLE \|
	94	IORESOURCE_ROM_SHADOW \|
	95	IORESOURCE_ROM_COPY)))
	96	pci_disable_rom(pdev);
	97	return NULL;
	98	}
	99
	100	/*
	101	* Try to find the true size of the ROM since sometimes the PCI window
	102	* size is much larger than the actual size of the ROM.
	103	* True size is important if the ROM is going to be copied.
	104	*/
	105	image = rom;
	106	do {
	107	void __iomem *pds;
	108	/* Standard PCI ROMs start out with these bytes 55 AA */
	109	if (readb(image) != 0x55)
	110	break;
	111	if (readb(image + 1) != 0xAA)
	112	break;
	113	/* get the PCI data structure and check its signature */
	114	pds = image + readw(image + 24);
115	if (readb(pds) != 'P')
116	break;
117	if (readb(pds + 1) != 'C')
118	break;
119	if (readb(pds + 2) != 'I')
120	break;
121	if (readb(pds + 3) != 'R')
122	break;
123	last_image = readb(pds + 21) & 0x80;
124	/* this length is reliable */
125	image += readw(pds + 16) * 512;
126	} while (!last_image);
127
128	*size = image - rom;
129
130	return rom;
131	}
132
133	/**
134	* pci_map_rom_copy - map a PCI ROM to kernel space, create a copy
67be2dd1	135	* @pdev: pointer to pci device struct
1da177e4 LT	136	* @size: pointer to receive size of pci window over ROM
	137	* @return: kernel virtual pointer to image of ROM
	138	*
	139	* Map a PCI ROM into kernel space. If ROM is boot video ROM,
	140	* the shadow BIOS copy will be returned instead of the
	141	* actual ROM.
	142	*/
	143	void __iomem pci_map_rom_copy(struct pci_dev pdev, size_t *size)
	144	{
	145	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	146	void __iomem *rom;
	147
	148	rom = pci_map_rom(pdev, size);
	149	if (!rom)
	150	return NULL;
	151
	152	if (res->flags & (IORESOURCE_ROM_COPY \| IORESOURCE_ROM_SHADOW))
	153	return rom;
	154
	155	res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
	156	if (!res->start)
	157	return rom;
	158
	159	res->end = res->start + *size;
	160	memcpy_fromio((void)res->start, rom, size);
	161	pci_unmap_rom(pdev, rom);
	162	res->flags \|= IORESOURCE_ROM_COPY;
	163
	164	return (void __iomem *)res->start;
	165	}
	166
	167	/**
	168	* pci_unmap_rom - unmap the ROM from kernel space
67be2dd1	169	* @pdev: pointer to pci device struct
1da177e4 LT	170	* @rom: virtual address of the previous mapping
	171	*
	172	* Remove a mapping of a previously mapped ROM
	173	*/
	174	void pci_unmap_rom(struct pci_dev pdev, void __iomem rom)
	175	{
	176	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	177
	178	if (res->flags & IORESOURCE_ROM_COPY)
	179	return;
	180
	181	iounmap(rom);
	182
	183	/* Disable again before continuing, leave enabled if pci=rom */
	184	if (!(res->flags & (IORESOURCE_ROM_ENABLE \| IORESOURCE_ROM_SHADOW)))
	185	pci_disable_rom(pdev);
	186	}
	187
	188	/**
	189	* pci_remove_rom - disable the ROM and remove its sysfs attribute
67be2dd1	190	* @pdev: pointer to pci device struct
1da177e4 LT	191	*
	192	* Remove the rom file in sysfs and disable ROM decoding.
	193	*/
	194	void pci_remove_rom(struct pci_dev *pdev)
	195	{
	196	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	197
	198	if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
	199	sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
	200	if (!(res->flags & (IORESOURCE_ROM_ENABLE \|
	201	IORESOURCE_ROM_SHADOW \|
	202	IORESOURCE_ROM_COPY)))
	203	pci_disable_rom(pdev);
	204	}
	205
	206	/**
	207	* pci_cleanup_rom - internal routine for freeing the ROM copy created
	208	* by pci_map_rom_copy called from remove.c
67be2dd1	209	* @pdev: pointer to pci device struct
1da177e4 LT	210	*
	211	* Free the copied ROM if we allocated one.
	212	*/
	213	void pci_cleanup_rom(struct pci_dev *pdev)
	214	{
	215	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
	216	if (res->flags & IORESOURCE_ROM_COPY) {
	217	kfree((void*)res->start);
	218	res->flags &= ~IORESOURCE_ROM_COPY;
	219	res->start = 0;
	220	res->end = 0;
	221	}
	222	}
	223
	224	EXPORT_SYMBOL(pci_map_rom);
	225	EXPORT_SYMBOL(pci_map_rom_copy);
	226	EXPORT_SYMBOL(pci_unmap_rom);
	227	EXPORT_SYMBOL(pci_remove_rom);