| /* |
| Copyright (C) 2004 - 2006 rt2x00 SourceForge Project |
| <http://rt2x00.serialmonkey.com> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the |
| Free Software Foundation, Inc., |
| 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| /* |
| Module: eeprom_93cx6 |
| Abstract: EEPROM reader routines for 93cx6 chipsets. |
| Supported chipsets: 93c46 & 93c66. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/version.h> |
| #include <linux/delay.h> |
| #include <linux/eeprom_93cx6.h> |
| |
| MODULE_AUTHOR("http://rt2x00.serialmonkey.com"); |
| MODULE_VERSION("1.0"); |
| MODULE_DESCRIPTION("EEPROM 93cx6 chip driver"); |
| MODULE_LICENSE("GPL"); |
| |
| static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom) |
| { |
| eeprom->reg_data_clock = 1; |
| eeprom->register_write(eeprom); |
| udelay(1); |
| } |
| |
| static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom) |
| { |
| eeprom->reg_data_clock = 0; |
| eeprom->register_write(eeprom); |
| udelay(1); |
| } |
| |
| static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom) |
| { |
| /* |
| * Clear all flags, and enable chip select. |
| */ |
| eeprom->register_read(eeprom); |
| eeprom->reg_data_in = 0; |
| eeprom->reg_data_out = 0; |
| eeprom->reg_data_clock = 0; |
| eeprom->reg_chip_select = 1; |
| eeprom->register_write(eeprom); |
| |
| /* |
| * kick a pulse. |
| */ |
| eeprom_93cx6_pulse_high(eeprom); |
| eeprom_93cx6_pulse_low(eeprom); |
| } |
| |
| static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom) |
| { |
| /* |
| * Clear chip_select and data_in flags. |
| */ |
| eeprom->register_read(eeprom); |
| eeprom->reg_data_in = 0; |
| eeprom->reg_chip_select = 0; |
| eeprom->register_write(eeprom); |
| |
| /* |
| * kick a pulse. |
| */ |
| eeprom_93cx6_pulse_high(eeprom); |
| eeprom_93cx6_pulse_low(eeprom); |
| } |
| |
| static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom, |
| const u16 data, const u16 count) |
| { |
| unsigned int i; |
| |
| eeprom->register_read(eeprom); |
| |
| /* |
| * Clear data flags. |
| */ |
| eeprom->reg_data_in = 0; |
| eeprom->reg_data_out = 0; |
| |
| /* |
| * Start writing all bits. |
| */ |
| for (i = count; i > 0; i--) { |
| /* |
| * Check if this bit needs to be set. |
| */ |
| eeprom->reg_data_in = !!(data & (1 << (i - 1))); |
| |
| /* |
| * Write the bit to the eeprom register. |
| */ |
| eeprom->register_write(eeprom); |
| |
| /* |
| * Kick a pulse. |
| */ |
| eeprom_93cx6_pulse_high(eeprom); |
| eeprom_93cx6_pulse_low(eeprom); |
| } |
| |
| eeprom->reg_data_in = 0; |
| eeprom->register_write(eeprom); |
| } |
| |
| static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom, |
| u16 *data, const u16 count) |
| { |
| unsigned int i; |
| u16 buf = 0; |
| |
| eeprom->register_read(eeprom); |
| |
| /* |
| * Clear data flags. |
| */ |
| eeprom->reg_data_in = 0; |
| eeprom->reg_data_out = 0; |
| |
| /* |
| * Start reading all bits. |
| */ |
| for (i = count; i > 0; i--) { |
| eeprom_93cx6_pulse_high(eeprom); |
| |
| eeprom->register_read(eeprom); |
| |
| /* |
| * Clear data_in flag. |
| */ |
| eeprom->reg_data_in = 0; |
| |
| /* |
| * Read if the bit has been set. |
| */ |
| if (eeprom->reg_data_out) |
| buf |= (1 << (i - 1)); |
| |
| eeprom_93cx6_pulse_low(eeprom); |
| } |
| |
| *data = buf; |
| } |
| |
| /** |
| * eeprom_93cx6_read - Read multiple words from eeprom |
| * @eeprom: Pointer to eeprom structure |
| * @word: Word index from where we should start reading |
| * @data: target pointer where the information will have to be stored |
| * |
| * This function will read the eeprom data as host-endian word |
| * into the given data pointer. |
| */ |
| void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, const u8 word, |
| u16 *data) |
| { |
| u16 command; |
| |
| /* |
| * Initialize the eeprom register |
| */ |
| eeprom_93cx6_startup(eeprom); |
| |
| /* |
| * Select the read opcode and the word to be read. |
| */ |
| command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word; |
| eeprom_93cx6_write_bits(eeprom, command, |
| PCI_EEPROM_WIDTH_OPCODE + eeprom->width); |
| |
| /* |
| * Read the requested 16 bits. |
| */ |
| eeprom_93cx6_read_bits(eeprom, data, 16); |
| |
| /* |
| * Cleanup eeprom register. |
| */ |
| eeprom_93cx6_cleanup(eeprom); |
| } |
| EXPORT_SYMBOL_GPL(eeprom_93cx6_read); |
| |
| /** |
| * eeprom_93cx6_multiread - Read multiple words from eeprom |
| * @eeprom: Pointer to eeprom structure |
| * @word: Word index from where we should start reading |
| * @data: target pointer where the information will have to be stored |
| * @words: Number of words that should be read. |
| * |
| * This function will read all requested words from the eeprom, |
| * this is done by calling eeprom_93cx6_read() multiple times. |
| * But with the additional change that while the eeprom_93cx6_read |
| * will return host ordered bytes, this method will return little |
| * endian words. |
| */ |
| void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word, |
| __le16 *data, const u16 words) |
| { |
| unsigned int i; |
| u16 tmp; |
| |
| for (i = 0; i < words; i++) { |
| tmp = 0; |
| eeprom_93cx6_read(eeprom, word + i, &tmp); |
| data[i] = cpu_to_le16(tmp); |
| } |
| } |
| EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread); |
| |