2007-05-11 21:59:40 +02:00
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/*
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Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: eeprom_93cx6
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Abstract: EEPROM reader routines for 93cx6 chipsets.
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Supported chipsets: 93c46 & 93c66.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/delay.h>
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#include <linux/eeprom_93cx6.h>
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MODULE_AUTHOR("http://rt2x00.serialmonkey.com");
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MODULE_VERSION("1.0");
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MODULE_DESCRIPTION("EEPROM 93cx6 chip driver");
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MODULE_LICENSE("GPL");
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static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 1;
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eeprom->register_write(eeprom);
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2007-05-14 23:06:01 +02:00
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/*
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* Add a short delay for the pulse to work.
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* According to the specifications the minimal time
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* should be 450ns so a 1us delay is sufficient.
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*/
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2007-05-11 21:59:40 +02:00
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udelay(1);
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}
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static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 0;
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eeprom->register_write(eeprom);
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2007-05-14 23:06:01 +02:00
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/*
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* Add a short delay for the pulse to work.
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* According to the specifications the minimal time
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* should be 450ns so a 1us delay is sufficient.
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*/
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2007-05-11 21:59:40 +02:00
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udelay(1);
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}
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static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)
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{
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/*
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* Clear all flags, and enable chip select.
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*/
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eeprom->register_read(eeprom);
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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eeprom->reg_data_clock = 0;
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eeprom->reg_chip_select = 1;
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eeprom->register_write(eeprom);
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/*
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* kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom)
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{
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/*
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* Clear chip_select and data_in flags.
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*/
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eeprom->register_read(eeprom);
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eeprom->reg_data_in = 0;
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eeprom->reg_chip_select = 0;
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eeprom->register_write(eeprom);
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/*
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* kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom,
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const u16 data, const u16 count)
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{
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unsigned int i;
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eeprom->register_read(eeprom);
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/*
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* Clear data flags.
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*/
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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/*
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* Start writing all bits.
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*/
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for (i = count; i > 0; i--) {
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/*
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* Check if this bit needs to be set.
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*/
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eeprom->reg_data_in = !!(data & (1 << (i - 1)));
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/*
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* Write the bit to the eeprom register.
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*/
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eeprom->register_write(eeprom);
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/*
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* Kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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eeprom->reg_data_in = 0;
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eeprom->register_write(eeprom);
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}
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static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
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u16 *data, const u16 count)
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{
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unsigned int i;
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u16 buf = 0;
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eeprom->register_read(eeprom);
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/*
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* Clear data flags.
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*/
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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/*
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* Start reading all bits.
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*/
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for (i = count; i > 0; i--) {
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eeprom_93cx6_pulse_high(eeprom);
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eeprom->register_read(eeprom);
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/*
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* Clear data_in flag.
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*/
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eeprom->reg_data_in = 0;
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/*
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* Read if the bit has been set.
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*/
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if (eeprom->reg_data_out)
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buf |= (1 << (i - 1));
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eeprom_93cx6_pulse_low(eeprom);
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}
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*data = buf;
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}
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/**
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* eeprom_93cx6_read - Read multiple words from eeprom
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* @eeprom: Pointer to eeprom structure
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* @word: Word index from where we should start reading
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* @data: target pointer where the information will have to be stored
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*
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* This function will read the eeprom data as host-endian word
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* into the given data pointer.
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*/
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void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, const u8 word,
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u16 *data)
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{
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u16 command;
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/*
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* Initialize the eeprom register
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*/
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eeprom_93cx6_startup(eeprom);
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/*
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* Select the read opcode and the word to be read.
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*/
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command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word;
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eeprom_93cx6_write_bits(eeprom, command,
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PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
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/*
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* Read the requested 16 bits.
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*/
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eeprom_93cx6_read_bits(eeprom, data, 16);
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/*
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* Cleanup eeprom register.
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*/
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eeprom_93cx6_cleanup(eeprom);
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}
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EXPORT_SYMBOL_GPL(eeprom_93cx6_read);
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/**
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* eeprom_93cx6_multiread - Read multiple words from eeprom
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* @eeprom: Pointer to eeprom structure
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* @word: Word index from where we should start reading
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* @data: target pointer where the information will have to be stored
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* @words: Number of words that should be read.
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*
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* This function will read all requested words from the eeprom,
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* this is done by calling eeprom_93cx6_read() multiple times.
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* But with the additional change that while the eeprom_93cx6_read
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* will return host ordered bytes, this method will return little
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* endian words.
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*/
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void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word,
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__le16 *data, const u16 words)
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{
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unsigned int i;
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u16 tmp;
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for (i = 0; i < words; i++) {
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tmp = 0;
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eeprom_93cx6_read(eeprom, word + i, &tmp);
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data[i] = cpu_to_le16(tmp);
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}
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}
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EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread);
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