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349 lines
9.1 KiB
Diff
349 lines
9.1 KiB
Diff
From: Ivo van Doorn <ivdoorn@gmail.com>
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Date: Fri, 11 May 2007 19:59:40 +0000 (-0400)
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Subject: [PATCH] Add 93cx6 eeprom library
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X-Git-Tag: v2.6.23-rc1~1201^2~74
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X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=9467d64b0e88763914c01f71ddf591b166c4f526
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[PATCH] Add 93cx6 eeprom library
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This patch adds a library for reading from 93cx6 eeproms.
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Signed-off-by: Michael Wu <flamingice@sourmilk.net>
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Signed-off-by: John W. Linville <linville@tuxdriver.com>
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---
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--- a/drivers/misc/Kconfig
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+++ b/drivers/misc/Kconfig
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@@ -34,6 +34,11 @@
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If you choose to build module, its name will be phantom. If unsure,
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say N here.
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+config EEPROM_93CX6
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+ tristate "EEPROM 93CX6 support"
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+ ---help---
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+ This is a driver for the EEPROM chipsets 93c46 and 93c66.
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+ The driver supports both read as well as write commands.
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If unsure, say N.
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@@ -187,5 +192,4 @@
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If you are not sure, say Y here.
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-
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endmenu
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--- a/drivers/misc/Makefile
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+++ b/drivers/misc/Makefile
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@@ -14,3 +14,4 @@
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obj-$(CONFIG_SGI_IOC4) += ioc4.o
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obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
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obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
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+obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
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--- /dev/null
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+++ b/drivers/misc/eeprom_93cx6.c
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@@ -0,0 +1,229 @@
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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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+
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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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+
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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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+
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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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+/*
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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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+
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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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+
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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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+
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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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+ udelay(1);
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+}
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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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+ udelay(1);
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+}
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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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+ /*
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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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+
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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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+ /*
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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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+
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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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+
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+ eeprom->register_read(eeprom);
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+
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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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+ /*
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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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+ /*
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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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+ /*
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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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+
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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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+
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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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+
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+ eeprom->register_read(eeprom);
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+
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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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+ /*
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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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+
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+ eeprom->register_read(eeprom);
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+
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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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+ /*
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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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+
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+ eeprom_93cx6_pulse_low(eeprom);
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+ }
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+
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+ *data = buf;
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+}
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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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+ /*
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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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+ /*
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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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+ /*
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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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+ /*
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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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+/**
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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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+
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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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+
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--- /dev/null
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+++ b/include/linux/eeprom_93cx6.h
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@@ -0,0 +1,72 @@
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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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+
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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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+
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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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+
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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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+/*
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+ Module: eeprom_93cx6
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+ Abstract: EEPROM reader datastructures for 93cx6 chipsets.
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+ Supported chipsets: 93c46 & 93c66.
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+ */
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+
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+/*
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+ * EEPROM operation defines.
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+ */
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+#define PCI_EEPROM_WIDTH_93C46 6
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+#define PCI_EEPROM_WIDTH_93C66 8
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+#define PCI_EEPROM_WIDTH_OPCODE 3
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+#define PCI_EEPROM_WRITE_OPCODE 0x05
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+#define PCI_EEPROM_READ_OPCODE 0x06
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+#define PCI_EEPROM_EWDS_OPCODE 0x10
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+#define PCI_EEPROM_EWEN_OPCODE 0x13
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+
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+/**
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+ * struct eeprom_93cx6 - control structure for setting the commands
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+ * for reading the eeprom data.
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+ * @data: private pointer for the driver.
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+ * @register_read(struct eeprom_93cx6 *eeprom): handler to
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+ * read the eeprom register, this function should set all reg_* fields.
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+ * @register_write(struct eeprom_93cx6 *eeprom): handler to
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+ * write to the eeprom register by using all reg_* fields.
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+ * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
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+ * @reg_data_in: register field to indicate data input
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+ * @reg_data_out: register field to indicate data output
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+ * @reg_data_clock: register field to set the data clock
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+ * @reg_chip_select: register field to set the chip select
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+ *
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+ * This structure is used for the communication between the driver
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+ * and the eeprom_93cx6 handlers for reading the eeprom.
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+ */
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+struct eeprom_93cx6 {
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+ void *data;
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+
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+ void (*register_read)(struct eeprom_93cx6 *eeprom);
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+ void (*register_write)(struct eeprom_93cx6 *eeprom);
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+
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+ int width;
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+
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+ char reg_data_in;
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+ char reg_data_out;
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+ char reg_data_clock;
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+ char reg_chip_select;
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+};
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+
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+extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
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+ const u8 word, u16 *data);
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+extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
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+ const u8 word, __le16 *data, const u16 words);
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