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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* credit winbond-840.c |
| 2 | */ |
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| 3 | #include <asm/io.h> |
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| 4 | struct eeprom_ops { |
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| 5 | void (*set_cs)(void *ee); |
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| 6 | void (*clear_cs)(void *ee); |
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| 7 | }; |
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| 8 | |||
| 9 | #define EEPOL_EEDI 0x01 |
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| 10 | #define EEPOL_EEDO 0x02 |
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| 11 | #define EEPOL_EECLK 0x04 |
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| 12 | #define EEPOL_EESEL 0x08 |
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| 13 | |||
| 14 | struct eeprom { |
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| 15 | void *dev; |
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| 16 | struct eeprom_ops *ops; |
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| 17 | |||
| 18 | long addr; |
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| 19 | |||
| 20 | unsigned ee_addr_bits; |
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| 21 | |||
| 22 | unsigned eesel; |
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| 23 | unsigned eeclk; |
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| 24 | unsigned eedo; |
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| 25 | unsigned eedi; |
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| 26 | unsigned polarity; |
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| 27 | unsigned ee_state; |
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| 28 | |||
| 29 | spinlock_t *lock; |
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| 30 | u32 *cache; |
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| 31 | }; |
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| 32 | |||
| 33 | |||
| 34 | u8 eeprom_readb(struct eeprom *ee, unsigned address); |
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| 35 | void eeprom_read(struct eeprom *ee, unsigned address, u8 *bytes, |
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| 36 | unsigned count); |
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| 37 | void eeprom_writeb(struct eeprom *ee, unsigned address, u8 data); |
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| 38 | void eeprom_write(struct eeprom *ee, unsigned address, u8 *bytes, |
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| 39 | unsigned count); |
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| 40 | |||
| 41 | /* The EEPROM commands include the alway-set leading bit. */ |
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| 42 | enum EEPROM_Cmds { |
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| 43 | EE_WriteCmd=(5 << 6), EE_ReadCmd=(6 << 6), EE_EraseCmd=(7 << 6), |
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| 44 | }; |
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| 45 | |||
| 46 | void setup_ee_mem_bitbanger(struct eeprom *ee, long memaddr, int eesel_bit, int eeclk_bit, int eedo_bit, int eedi_bit, unsigned polarity) |
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| 47 | { |
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| 48 | ee->addr = memaddr; |
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| 49 | ee->eesel = 1 << eesel_bit; |
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| 50 | ee->eeclk = 1 << eeclk_bit; |
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| 51 | ee->eedo = 1 << eedo_bit; |
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| 52 | ee->eedi = 1 << eedi_bit; |
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| 53 | |||
| 54 | ee->polarity = polarity; |
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| 55 | |||
| 56 | *ee->cache = readl(ee->addr); |
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| 57 | } |
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| 58 | |||
| 59 | /* foo. put this in a .c file */ |
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| 60 | static inline void eeprom_update(struct eeprom *ee, u32 mask, int pol) |
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| 61 | { |
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| 62 | unsigned long flags; |
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| 63 | u32 data; |
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| 64 | |||
| 65 | spin_lock_irqsave(ee->lock, flags); |
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| 66 | data = *ee->cache; |
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| 67 | |||
| 68 | data &= ~mask; |
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| 69 | if (pol) |
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| 70 | data |= mask; |
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| 71 | |||
| 72 | *ee->cache = data; |
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| 73 | //printk("update: %08x\n", data); |
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| 74 | writel(data, ee->addr); |
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| 75 | spin_unlock_irqrestore(ee->lock, flags); |
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| 76 | } |
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| 77 | |||
| 78 | void eeprom_clk_lo(struct eeprom *ee) |
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| 79 | { |
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| 80 | int pol = !!(ee->polarity & EEPOL_EECLK); |
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| 81 | |||
| 82 | eeprom_update(ee, ee->eeclk, pol); |
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| 83 | udelay(2); |
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| 84 | } |
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| 85 | |||
| 86 | void eeprom_clk_hi(struct eeprom *ee) |
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| 87 | { |
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| 88 | int pol = !!(ee->polarity & EEPOL_EECLK); |
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| 89 | |||
| 90 | eeprom_update(ee, ee->eeclk, !pol); |
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| 91 | udelay(2); |
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| 92 | } |
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| 93 | |||
| 94 | void eeprom_send_addr(struct eeprom *ee, unsigned address) |
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| 95 | { |
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| 96 | int pol = !!(ee->polarity & EEPOL_EEDI); |
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| 97 | unsigned i; |
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| 98 | address |= 6 << 6; |
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| 99 | |||
| 100 | /* Shift the read command bits out. */ |
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| 101 | for (i=0; i<11; i++) { |
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| 102 | eeprom_update(ee, ee->eedi, ((address >> 10) & 1) ^ pol); |
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| 103 | address <<= 1; |
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| 104 | eeprom_clk_hi(ee); |
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| 105 | eeprom_clk_lo(ee); |
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| 106 | } |
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| 107 | eeprom_update(ee, ee->eedi, pol); |
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| 108 | } |
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| 109 | |||
| 110 | u16 eeprom_readw(struct eeprom *ee, unsigned address) |
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| 111 | { |
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| 112 | unsigned i; |
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| 113 | u16 res = 0; |
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| 114 | |||
| 115 | eeprom_clk_lo(ee); |
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| 116 | eeprom_update(ee, ee->eesel, 1 ^ !!(ee->polarity & EEPOL_EESEL)); |
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| 117 | eeprom_send_addr(ee, address); |
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| 118 | |||
| 119 | for (i=0; i<16; i++) { |
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| 120 | u32 data; |
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| 121 | eeprom_clk_hi(ee); |
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| 122 | res <<= 1; |
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| 123 | data = readl(ee->addr); |
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| 124 | //printk("eeprom_readw: %08x\n", data); |
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| 125 | res |= !!(data & ee->eedo) ^ !!(ee->polarity & EEPOL_EEDO); |
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| 126 | eeprom_clk_lo(ee); |
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| 127 | } |
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| 128 | eeprom_update(ee, ee->eesel, 0 ^ !!(ee->polarity & EEPOL_EESEL)); |
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| 129 | |||
| 130 | return res; |
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| 131 | } |
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| 132 | |||
| 133 | |||
| 134 | void eeprom_writeb(struct eeprom *ee, unsigned address, u8 data) |
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| 135 | { |
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| 136 | } |