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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [pci/] [rom.c] - Blame information for rev 62

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/*
 * 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/kernel.h>
#include <linux/pci.h>
#include <linux/slab.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 int pci_enable_rom(struct pci_dev *pdev)
{
        struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
        struct pci_bus_region region;
        u32 rom_addr;
 
        if (!res->flags)
                return -1;
 
        pcibios_resource_to_bus(pdev, &region, res);
        pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
        rom_addr &= ~PCI_ROM_ADDRESS_MASK;
        rom_addr |= region.start | PCI_ROM_ADDRESS_ENABLE;
        pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
        return 0;
}
 
/**
 * 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_get_rom_size - obtain the actual size of the ROM image
 * @rom: kernel virtual pointer to image of ROM
 * @size: size of PCI window
 *  return: size of actual ROM image
 *
 * Determine the actual length of the ROM image.
 * The PCI window size could be much larger than the
 * actual image size.
 */
size_t pci_get_rom_size(void __iomem *rom, size_t size)
{
        void __iomem *image;
        int last_image;
 
        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);
 
        /* never return a size larger than the PCI resource window */
        /* there are known ROMs that get the size wrong */
        return min((size_t)(image - rom), size);
}
 
/**
 * 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;
 
        /*
         * IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy
         * memory map if the VGA enable bit of the Bridge Control register is
         * set for embedded VGA.
         */
        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 | IORESOURCE_ROM_BIOS_COPY)) {
                        *size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
                        return (void __iomem *)(unsigned long)
                                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))
                                return NULL;
                        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 */
                        if (pci_enable_rom(pdev))
                                return NULL;
                }
        }
 
        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.
         */
        *size = pci_get_rom_size(rom, *size);
        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 |
                          IORESOURCE_ROM_BIOS_COPY))
                return rom;
 
        res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
        if (!res->start)
                return rom;
 
        res->end = res->start + *size;
        memcpy_fromio((void*)(unsigned long)res->start, rom, *size);
        pci_unmap_rom(pdev, rom);
        res->flags |= IORESOURCE_ROM_COPY;
 
        return (void __iomem *)(unsigned long)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 | IORESOURCE_ROM_BIOS_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_BIOS_COPY |
                            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*)(unsigned long)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);

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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [pci/] [rom.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
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/kernel.h>`
10			`#include <linux/pci.h>`
11			`#include <linux/slab.h>`
12
13			`#include "pci.h"`
14
15			`/**`
16			`* pci_enable_rom - enable ROM decoding for a PCI device`
17			`* @pdev: PCI device to enable`
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 int pci_enable_rom(struct pci_dev *pdev)`
25			`{`
26			`struct resource *res = pdev->resource + PCI_ROM_RESOURCE;`
27			`struct pci_bus_region region;`
28			`u32 rom_addr;`
29
30			`if (!res->flags)`
31			`return -1;`
32
33			`pcibios_resource_to_bus(pdev, &region, res);`
34			`pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);`
35			`rom_addr &= ~PCI_ROM_ADDRESS_MASK;`
36			`rom_addr \|= region.start \| PCI_ROM_ADDRESS_ENABLE;`
37			`pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);`
38			`return 0;`
39			`}`
40
41			`/**`
42			`* pci_disable_rom - disable ROM decoding for a PCI device`
43			`* @pdev: PCI device to disable`
44			`*`
45			`* Disable ROM decoding on a PCI device by turning off the last bit in the`
46			`* ROM BAR.`
47			`*/`
48			`static void pci_disable_rom(struct pci_dev *pdev)`
49			`{`
50			`u32 rom_addr;`
51			`pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);`
52			`rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;`
53			`pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);`
54			`}`
55
56			`/**`
57			`* pci_get_rom_size - obtain the actual size of the ROM image`
58			`* @rom: kernel virtual pointer to image of ROM`
59			`* @size: size of PCI window`
60			`* return: size of actual ROM image`
61			`*`
62			`* Determine the actual length of the ROM image.`
63			`* The PCI window size could be much larger than the`
64			`* actual image size.`
65			`*/`
66			`size_t pci_get_rom_size(void __iomem *rom, size_t size)`
67			`{`
68			`void __iomem *image;`
69			`int last_image;`
70
71			`image = rom;`
72			`do {`
73			`void __iomem *pds;`
74			`/* Standard PCI ROMs start out with these bytes 55 AA */`
75			`if (readb(image) != 0x55)`
76			`break;`
77			`if (readb(image + 1) != 0xAA)`
78			`break;`
79			`/* get the PCI data structure and check its signature */`
80			`pds = image + readw(image + 24);`
81			`if (readb(pds) != 'P')`
82			`break;`
83			`if (readb(pds + 1) != 'C')`
84			`break;`
85			`if (readb(pds + 2) != 'I')`
86			`break;`
87			`if (readb(pds + 3) != 'R')`
88			`break;`
89			`last_image = readb(pds + 21) & 0x80;`
90			`/* this length is reliable */`
91			`image += readw(pds + 16) * 512;`
92			`} while (!last_image);`
93
94			`/* never return a size larger than the PCI resource window */`
95			`/* there are known ROMs that get the size wrong */`
96			`return min((size_t)(image - rom), size);`
97			`}`
98
99			`/**`
100			`* pci_map_rom - map a PCI ROM to kernel space`
101			`* @pdev: pointer to pci device struct`
102			`* @size: pointer to receive size of pci window over ROM`
103			`* @return: kernel virtual pointer to image of ROM`
104			`*`
105			`* Map a PCI ROM into kernel space. If ROM is boot video ROM,`
106			`* the shadow BIOS copy will be returned instead of the`
107			`* actual ROM.`
108			`*/`
109			`void __iomem pci_map_rom(struct pci_dev pdev, size_t *size)`
110			`{`
111			`struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];`
112			`loff_t start;`
113			`void __iomem *rom;`
114
115			`/*`
116			`* IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy`
117			`* memory map if the VGA enable bit of the Bridge Control register is`
118			`* set for embedded VGA.`
119			`*/`
120			`if (res->flags & IORESOURCE_ROM_SHADOW) {`
121			`/* primary video rom always starts here */`
122			`start = (loff_t)0xC0000;`
123			`size = 0x20000; / cover C000:0 through E000:0 */`
124			`} else {`
125			`if (res->flags &`
126			`(IORESOURCE_ROM_COPY \| IORESOURCE_ROM_BIOS_COPY)) {`
127			`*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);`
128			`return (void __iomem *)(unsigned long)`
129			`pci_resource_start(pdev, PCI_ROM_RESOURCE);`
130			`} else {`
131			`/* assign the ROM an address if it doesn't have one */`
132			`if (res->parent == NULL &&`
133			`pci_assign_resource(pdev,PCI_ROM_RESOURCE))`
134			`return NULL;`
135			`start = pci_resource_start(pdev, PCI_ROM_RESOURCE);`
136			`*size = pci_resource_len(pdev, PCI_ROM_RESOURCE);`
137			`if (*size == 0)`
138			`return NULL;`
139
140			`/* Enable ROM space decodes */`
141			`if (pci_enable_rom(pdev))`
142			`return NULL;`
143			`}`
144			`}`
145
146			`rom = ioremap(start, *size);`
147			`if (!rom) {`
148			`/* restore enable if ioremap fails */`
149			`if (!(res->flags & (IORESOURCE_ROM_ENABLE \|`
150			`IORESOURCE_ROM_SHADOW \|`
151			`IORESOURCE_ROM_COPY)))`
152			`pci_disable_rom(pdev);`
153			`return NULL;`
154			`}`
155
156			`/*`
157			`* Try to find the true size of the ROM since sometimes the PCI window`
158			`* size is much larger than the actual size of the ROM.`
159			`* True size is important if the ROM is going to be copied.`
160			`*/`
161			`size = pci_get_rom_size(rom, size);`
162			`return rom;`
163			`}`
164
165			`/**`
166			`* pci_map_rom_copy - map a PCI ROM to kernel space, create a copy`
167			`* @pdev: pointer to pci device struct`
168			`* @size: pointer to receive size of pci window over ROM`
169			`* @return: kernel virtual pointer to image of ROM`
170			`*`
171			`* Map a PCI ROM into kernel space. If ROM is boot video ROM,`
172			`* the shadow BIOS copy will be returned instead of the`
173			`* actual ROM.`
174			`*/`
175			`void __iomem pci_map_rom_copy(struct pci_dev pdev, size_t *size)`
176			`{`
177			`struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];`
178			`void __iomem *rom;`
179
180			`rom = pci_map_rom(pdev, size);`
181			`if (!rom)`
182			`return NULL;`
183
184			`if (res->flags & (IORESOURCE_ROM_COPY \| IORESOURCE_ROM_SHADOW \|`
185			`IORESOURCE_ROM_BIOS_COPY))`
186			`return rom;`
187
188			`res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);`
189			`if (!res->start)`
190			`return rom;`
191
192			`res->end = res->start + *size;`
193			`memcpy_fromio((void)(unsigned long)res->start, rom, size);`
194			`pci_unmap_rom(pdev, rom);`
195			`res->flags \|= IORESOURCE_ROM_COPY;`
196
197			`return (void __iomem *)(unsigned long)res->start;`
198			`}`
199
200			`/**`
201			`* pci_unmap_rom - unmap the ROM from kernel space`
202			`* @pdev: pointer to pci device struct`
203			`* @rom: virtual address of the previous mapping`
204			`*`
205			`* Remove a mapping of a previously mapped ROM`
206			`*/`
207			`void pci_unmap_rom(struct pci_dev pdev, void __iomem rom)`
208			`{`
209			`struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];`
210
211			`if (res->flags & (IORESOURCE_ROM_COPY \| IORESOURCE_ROM_BIOS_COPY))`
212			`return;`
213
214			`iounmap(rom);`
215
216			`/* Disable again before continuing, leave enabled if pci=rom */`
217			`if (!(res->flags & (IORESOURCE_ROM_ENABLE \| IORESOURCE_ROM_SHADOW)))`
218			`pci_disable_rom(pdev);`
219			`}`
220
221			`/**`
222			`* pci_remove_rom - disable the ROM and remove its sysfs attribute`
223			`* @pdev: pointer to pci device struct`
224			`*`
225			`* Remove the rom file in sysfs and disable ROM decoding.`
226			`*/`
227			`void pci_remove_rom(struct pci_dev *pdev)`
228			`{`
229			`struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];`
230
231			`if (pci_resource_len(pdev, PCI_ROM_RESOURCE))`
232			`sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);`
233			`if (!(res->flags & (IORESOURCE_ROM_ENABLE \|`
234			`IORESOURCE_ROM_SHADOW \|`
235			`IORESOURCE_ROM_BIOS_COPY \|`
236			`IORESOURCE_ROM_COPY)))`
237			`pci_disable_rom(pdev);`
238			`}`
239
240			`/**`
241			`* pci_cleanup_rom - internal routine for freeing the ROM copy created`
242			`* by pci_map_rom_copy called from remove.c`
243			`* @pdev: pointer to pci device struct`
244			`*`
245			`* Free the copied ROM if we allocated one.`
246			`*/`
247			`void pci_cleanup_rom(struct pci_dev *pdev)`
248			`{`
249			`struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];`
250			`if (res->flags & IORESOURCE_ROM_COPY) {`
251			`kfree((void*)(unsigned long)res->start);`
252			`res->flags &= ~IORESOURCE_ROM_COPY;`
253			`res->start = 0;`
254			`res->end = 0;`
255			`}`
256			`}`
257
258			`EXPORT_SYMBOL(pci_map_rom);`
259			`EXPORT_SYMBOL(pci_map_rom_copy);`
260			`EXPORT_SYMBOL(pci_unmap_rom);`
261			`EXPORT_SYMBOL(pci_remove_rom);`