misc/eeprom/eeprom_93cx6.c

21 static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
23 	eeprom->reg_data_clock = 1;
24 	eeprom->register_write(eeprom);
34 static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
36 	eeprom->reg_data_clock = 0;
37 	eeprom->register_write(eeprom);
47 static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)
52 	eeprom->register_read(eeprom);
53 	eeprom->reg_data_in = 0;
54 	eeprom->reg_data_out = 0;
55 	eeprom->reg_data_clock = 0;
56 	eeprom->reg_chip_select = 1;
57 	eeprom->drive_data = 1;
58 	eeprom->register_write(eeprom);
63 	eeprom_93cx6_pulse_high(eeprom);
64 	eeprom_93cx6_pulse_low(eeprom);
67 static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom)
72 	eeprom->register_read(eeprom);
73 	eeprom->reg_data_in = 0;
74 	eeprom->reg_chip_select = 0;
75 	eeprom->register_write(eeprom);
80 	eeprom_93cx6_pulse_high(eeprom);
81 	eeprom_93cx6_pulse_low(eeprom);
84 static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom,
89 	eeprom->register_read(eeprom);
94 	eeprom->reg_data_in = 0;
95 	eeprom->reg_data_out = 0;
96 	eeprom->drive_data = 1;
105 		eeprom->reg_data_in = !!(data & (1 << (i - 1)));
108 		 * Write the bit to the eeprom register.
110 		eeprom->register_write(eeprom);
115 		eeprom_93cx6_pulse_high(eeprom);
116 		eeprom_93cx6_pulse_low(eeprom);
119 	eeprom->reg_data_in = 0;
120 	eeprom->register_write(eeprom);
123 static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
129 	eeprom->register_read(eeprom);
134 	eeprom->reg_data_in = 0;
135 	eeprom->reg_data_out = 0;
136 	eeprom->drive_data = 0;
142 		eeprom_93cx6_pulse_high(eeprom);
144 		eeprom->register_read(eeprom);
149 		eeprom->reg_data_in = 0;
154 		if (eeprom->reg_data_out)
157 		eeprom_93cx6_pulse_low(eeprom);
164  * eeprom_93cx6_read - Read a word from eeprom
165  * @eeprom: Pointer to eeprom structure
169  * This function will read the eeprom data as host-endian word
172 void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, const u8 word,
178 	 * Initialize the eeprom register
180 	eeprom_93cx6_startup(eeprom);
185 	command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word;
186 	eeprom_93cx6_write_bits(eeprom, command,
187 		PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
192 	eeprom_93cx6_read_bits(eeprom, data, 16);
195 	 * Cleanup eeprom register.
197 	eeprom_93cx6_cleanup(eeprom);
202  * eeprom_93cx6_multiread - Read multiple words from eeprom
203  * @eeprom: Pointer to eeprom structure
208  * This function will read all requested words from the eeprom,
214 void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word,
222 		eeprom_93cx6_read(eeprom, word + i, &tmp);
229  * eeprom_93cx6_readb - Read a byte from eeprom
230  * @eeprom: Pointer to eeprom structure
234  * This function will read a byte of the eeprom data
237 void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom, const u8 byte,
244 	 * Initialize the eeprom register
246 	eeprom_93cx6_startup(eeprom);
251 	command = (PCI_EEPROM_READ_OPCODE << (eeprom->width + 1)) | byte;
252 	eeprom_93cx6_write_bits(eeprom, command,
253 		PCI_EEPROM_WIDTH_OPCODE + eeprom->width + 1);
258 	eeprom_93cx6_read_bits(eeprom, &tmp, 8);
262 	 * Cleanup eeprom register.
264 	eeprom_93cx6_cleanup(eeprom);
269  * eeprom_93cx6_multireadb - Read multiple bytes from eeprom
270  * @eeprom: Pointer to eeprom structure
275  * This function will read all requested bytes from the eeprom,
278 void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom, const u8 byte,
284 		eeprom_93cx6_readb(eeprom, byte + i, &data[i]);
290  * @eeprom: Pointer to eeprom structure
296 void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable)
301 	eeprom_93cx6_startup(eeprom);
306 	command <<= (eeprom->width - 2);
308 	eeprom_93cx6_write_bits(eeprom, command,
309 				PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
311 	eeprom_93cx6_cleanup(eeprom);
317  * @eeprom: Pointer to eeprom structure
328 void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom, u8 addr, u16 data)
334 	eeprom_93cx6_startup(eeprom);
336 	command = PCI_EEPROM_WRITE_OPCODE << eeprom->width;
340 	eeprom_93cx6_write_bits(eeprom, command,
341 				PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
344 	eeprom_93cx6_write_bits(eeprom, data, 16);
347 	eeprom->drive_data = 0;
348 	eeprom->reg_chip_select = 1;
349 	eeprom->register_write(eeprom);
357 		eeprom->register_read(eeprom);
359 		if (eeprom->reg_data_out)
370 	eeprom_93cx6_cleanup(eeprom);