1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
24 	eeprom->reg_data_clock = 1;  in eeprom_93cx6_pulse_high()
25 	eeprom->register_write(eeprom);  in eeprom_93cx6_pulse_high()
37 	eeprom->reg_data_clock = 0;  in eeprom_93cx6_pulse_low()
38 	eeprom->register_write(eeprom);  in eeprom_93cx6_pulse_low()
51 	 * Clear all flags, and enable chip select.  in eeprom_93cx6_startup()
53 	eeprom->register_read(eeprom);  in eeprom_93cx6_startup()
54 	eeprom->reg_data_in = 0;  in eeprom_93cx6_startup()
55 	eeprom->reg_data_out = 0;  in eeprom_93cx6_startup()
56 	eeprom->reg_data_clock = 0;  in eeprom_93cx6_startup()
57 	eeprom->reg_chip_select = 1;  in eeprom_93cx6_startup()
58 	eeprom->drive_data = 1;  in eeprom_93cx6_startup()
59 	eeprom->register_write(eeprom);  in eeprom_93cx6_startup()
73 	eeprom->register_read(eeprom);  in eeprom_93cx6_cleanup()
74 	eeprom->reg_data_in = 0;  in eeprom_93cx6_cleanup()
75 	eeprom->reg_chip_select = 0;  in eeprom_93cx6_cleanup()
76 	eeprom->register_write(eeprom);  in eeprom_93cx6_cleanup()
90 	eeprom->register_read(eeprom);  in eeprom_93cx6_write_bits()
95 	eeprom->reg_data_in = 0;  in eeprom_93cx6_write_bits()
96 	eeprom->reg_data_out = 0;  in eeprom_93cx6_write_bits()
97 	eeprom->drive_data = 1;  in eeprom_93cx6_write_bits()
102 	for (i = count; i > 0; i--) {  in eeprom_93cx6_write_bits()
106 		eeprom->reg_data_in = !!(data & BIT(i - 1));  in eeprom_93cx6_write_bits()
109 		 * Write the bit to the eeprom register.  in eeprom_93cx6_write_bits()
111 		eeprom->register_write(eeprom);  in eeprom_93cx6_write_bits()
120 	eeprom->reg_data_in = 0;  in eeprom_93cx6_write_bits()
121 	eeprom->register_write(eeprom);  in eeprom_93cx6_write_bits()
130 	eeprom->register_read(eeprom);  in eeprom_93cx6_read_bits()
135 	eeprom->reg_data_in = 0;  in eeprom_93cx6_read_bits()
136 	eeprom->reg_data_out = 0;  in eeprom_93cx6_read_bits()
137 	eeprom->drive_data = 0;  in eeprom_93cx6_read_bits()
142 	for (i = count; i > 0; i--) {  in eeprom_93cx6_read_bits()
145 		eeprom->register_read(eeprom);  in eeprom_93cx6_read_bits()
150 		eeprom->reg_data_in = 0;  in eeprom_93cx6_read_bits()
155 		if (eeprom->reg_data_out)  in eeprom_93cx6_read_bits()
156 			buf |= BIT(i - 1);  in eeprom_93cx6_read_bits()
165  * eeprom_93cx6_read - Read a word from eeprom
170  * This function will read the eeprom data as host-endian word
186 	command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word;  in eeprom_93cx6_read()
188 		PCI_EEPROM_WIDTH_OPCODE + eeprom->width);  in eeprom_93cx6_read()
208  * eeprom_93cx6_multiread - Read multiple words from eeprom
235  * eeprom_93cx6_readb - Read a byte from eeprom
257 	command = (PCI_EEPROM_READ_OPCODE << (eeprom->width + 1)) | byte;  in eeprom_93cx6_readb()
259 		PCI_EEPROM_WIDTH_OPCODE + eeprom->width + 1);  in eeprom_93cx6_readb()
280  * eeprom_93cx6_multireadb - Read multiple bytes from eeprom
300  * eeprom_93cx6_wren - set the write enable state
302  * @enable: true to enable writes, otherwise disable writes
304  * Set the EEPROM write enable state to either allow or deny
305  * writes depending on the @enable value.
307 void eeprom_93cx6_wren(struct eeprom_93cx6 *eeprom, bool enable)  in eeprom_93cx6_wren()  argument
314 	/* create command to enable/disable */  in eeprom_93cx6_wren()
316 	command = enable ? PCI_EEPROM_EWEN_OPCODE : PCI_EEPROM_EWDS_OPCODE;  in eeprom_93cx6_wren()
317 	command <<= (eeprom->width - 2);  in eeprom_93cx6_wren()
320 				PCI_EEPROM_WIDTH_OPCODE + eeprom->width);  in eeprom_93cx6_wren()
327  * eeprom_93cx6_write - write data to the EEPROM
329  * @addr: Address to write data to.
330  * @data: The data to write to address @addr.
332  * Write the @data to the specified @addr in the EEPROM and
335  * Note, since we do not expect large number of write operations
347 	command = PCI_EEPROM_WRITE_OPCODE << eeprom->width;  in eeprom_93cx6_write()
350 	/* send write command */  in eeprom_93cx6_write()
352 				PCI_EEPROM_WIDTH_OPCODE + eeprom->width);  in eeprom_93cx6_write()
358 	eeprom->drive_data = 0;  in eeprom_93cx6_write()
359 	eeprom->reg_chip_select = 1;  in eeprom_93cx6_write()
360 	eeprom->register_write(eeprom);  in eeprom_93cx6_write()
362 	/* wait at-least 250ns to get DO to be the busy signal */  in eeprom_93cx6_write()
368 		eeprom->register_read(eeprom);  in eeprom_93cx6_write()
370 		if (eeprom->reg_data_out)  in eeprom_93cx6_write()
375 		if (--timeout <= 0) {  in eeprom_93cx6_write()