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8a9bab08 MF |
1 | /* |
2 | * gpio_cfi_flash.c - GPIO-assisted Flash Chip Support | |
3 | * | |
71dcc2c2 | 4 | * Copyright (c) 2009-2010 Analog Devices Inc. |
8a9bab08 MF |
5 | * |
6 | * Licensed under the GPL-2 or later. | |
7 | */ | |
8 | ||
9 | #include <common.h> | |
10 | #include <asm/blackfin.h> | |
570ba440 | 11 | #include <asm/gpio.h> |
8a9bab08 MF |
12 | #include <asm/io.h> |
13 | #include "gpio_cfi_flash.h" | |
14 | ||
71dcc2c2 MF |
15 | /* Allow this driver to be shared among boards */ |
16 | #ifndef GPIO_PIN_1 | |
570ba440 | 17 | #define GPIO_PIN_1 GPIO_PF4 |
71dcc2c2 | 18 | #endif |
8a9bab08 | 19 | #define GPIO_MASK_1 (1 << 21) |
71dcc2c2 MF |
20 | #ifndef GPIO_PIN_2 |
21 | #define GPIO_MASK_2 (0) | |
22 | #else | |
23 | #define GPIO_MASK_2 (1 << 22) | |
24 | #endif | |
68409f84 PM |
25 | #ifndef GPIO_PIN_3 |
26 | #define GPIO_MASK_3 (0) | |
27 | #else | |
28 | #define GPIO_MASK_3 (1 << 23) | |
29 | #endif | |
30 | #define GPIO_MASK (GPIO_MASK_1 | GPIO_MASK_2 | GPIO_MASK_3) | |
8a9bab08 MF |
31 | |
32 | void *gpio_cfi_flash_swizzle(void *vaddr) | |
33 | { | |
34 | unsigned long addr = (unsigned long)vaddr; | |
35 | ||
570ba440 | 36 | gpio_set_value(GPIO_PIN_1, addr & GPIO_MASK_1); |
8a9bab08 | 37 | |
71dcc2c2 | 38 | #ifdef GPIO_PIN_2 |
570ba440 | 39 | gpio_set_value(GPIO_PIN_2, addr & GPIO_MASK_2); |
8a9bab08 MF |
40 | #endif |
41 | ||
68409f84 PM |
42 | #ifdef GPIO_PIN_3 |
43 | gpio_set_value(GPIO_PIN_3, addr & GPIO_MASK_3); | |
44 | #endif | |
45 | ||
8a9bab08 | 46 | SSYNC(); |
71dcc2c2 | 47 | udelay(1); |
8a9bab08 MF |
48 | |
49 | return (void *)(addr & ~GPIO_MASK); | |
50 | } | |
51 | ||
52 | #define __raw_writeq(value, addr) *(volatile u64 *)addr = value | |
53 | #define __raw_readq(addr) *(volatile u64 *)addr | |
54 | ||
55 | #define MAKE_FLASH(size, sfx) \ | |
56 | void flash_write##size(u##size value, void *addr) \ | |
57 | { \ | |
58 | __raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \ | |
59 | } \ | |
60 | u##size flash_read##size(void *addr) \ | |
61 | { \ | |
62 | return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \ | |
63 | } | |
64 | MAKE_FLASH(8, b) /* flash_write8() flash_read8() */ | |
e637385e MF |
65 | MAKE_FLASH(16, w) /* flash_write16() flash_read16() */ |
66 | MAKE_FLASH(32, l) /* flash_write32() flash_read32() */ | |
67 | MAKE_FLASH(64, q) /* flash_write64() flash_read64() */ | |
8a9bab08 MF |
68 | |
69 | void gpio_cfi_flash_init(void) | |
70 | { | |
570ba440 | 71 | gpio_request(GPIO_PIN_1, "gpio_cfi_flash"); |
71dcc2c2 MF |
72 | gpio_direction_output(GPIO_PIN_1, 0); |
73 | #ifdef GPIO_PIN_2 | |
570ba440 | 74 | gpio_request(GPIO_PIN_2, "gpio_cfi_flash"); |
71dcc2c2 | 75 | gpio_direction_output(GPIO_PIN_2, 0); |
570ba440 | 76 | #endif |
68409f84 PM |
77 | #ifdef GPIO_PIN_3 |
78 | gpio_request(GPIO_PIN_3, "gpio_cfi_flash"); | |
79 | gpio_direction_output(GPIO_PIN_3, 0); | |
80 | #endif | |
8a9bab08 | 81 | } |