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Date: Wed, 13 Dec 2006 19:56:50 +0100
From: Ivo van Doorn <ivdoorn@...il.com>
To: "John W. Linville" <linville@...driver.com>
Cc: netdev@...r.kernel.org,
Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
Michael Wu <flamingice@...rmilk.net>
Subject: [PATCH] eeprom_93cx6: Add write support
This patch addes support for writing to the eeprom,
this also moves some duplicate code into seperate functions.
Signed-off-by Ivo van Doorn <IvDoorn@...il.com>
---
diff -rNU3 wireless-dev/include/linux/eeprom_93cx6.h wireless-dev-eeprom/include/linux/eeprom_93cx6.h
--- wireless-dev/include/linux/eeprom_93cx6.h 2006-12-13 19:04:44.000000000 +0100
+++ wireless-dev-eeprom/include/linux/eeprom_93cx6.h 2006-12-13 18:28:36.000000000 +0100
@@ -32,6 +32,8 @@
#define PCI_EEPROM_WIDTH_OPCODE 3
#define PCI_EEPROM_WRITE_OPCODE 0x05
#define PCI_EEPROM_READ_OPCODE 0x06
+#define PCI_EEPROM_EWDS_OPCODE 0x10
+#define PCI_EEPROM_EWEN_OPCODE 0x13
/**
* struct eeprom_93cx6 - control structure for setting the commands
@@ -68,3 +70,8 @@
const u8 word, __le16 *data);
extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
const u8 word, __le16 *data, const u16 words);
+
+extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom,
+ const u8 word, __le16 *data);
+extern void eeprom_93cx6_multiwrite(struct eeprom_93cx6 *eeprom,
+ const u8 word, __le16 *data, const u16 words);
diff -rNU3 wireless-dev/lib/eeprom_93cx6.c wireless-dev-eeprom/lib/eeprom_93cx6.c
--- wireless-dev/lib/eeprom_93cx6.c 2006-12-13 19:04:44.000000000 +0100
+++ wireless-dev-eeprom/lib/eeprom_93cx6.c 2006-12-13 18:50:25.000000000 +0100
@@ -49,6 +49,42 @@
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)
{
@@ -123,6 +159,44 @@
}
}
+static void eeprom_93cx6_ewen(struct eeprom_93cx6 *eeprom)
+{
+ /*
+ * Initialize the eeprom register
+ */
+ eeprom_93cx6_startup(eeprom);
+
+ /*
+ * Select the read opcode and the word to be read.
+ */
+ eeprom_93cx6_write_bits(eeprom, PCI_EEPROM_EWEN_OPCODE, 5);
+ eeprom_93cx6_write_bits(eeprom, 0, 6);
+
+ /*
+ * Cleanup eeprom register.
+ */
+ eeprom_93cx6_cleanup(eeprom);
+}
+
+static void eeprom_93cx6_ewds(struct eeprom_93cx6 *eeprom)
+{
+ /*
+ * Initialize the eeprom register
+ */
+ eeprom_93cx6_startup(eeprom);
+
+ /*
+ * Select the read opcode and the word to be read.
+ */
+ eeprom_93cx6_write_bits(eeprom, PCI_EEPROM_EWDS_OPCODE, 5);
+ eeprom_93cx6_write_bits(eeprom, 0, 6);
+
+ /*
+ * Cleanup eeprom register.
+ */
+ eeprom_93cx6_cleanup(eeprom);
+}
+
/**
* eeprom_93cx6_read - Read multiple words from eeprom
* @eeprom: Pointer to eeprom structure
@@ -139,20 +213,9 @@
u16 buffer = 0;
/*
- * Clear all flags, and enable chip select.
+ * Initialize the eeprom register
*/
- 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);
+ eeprom_93cx6_startup(eeprom);
/*
* Select the read opcode and the word to be read.
@@ -167,18 +230,9 @@
eeprom_93cx6_read_bits(eeprom, &buffer, 16);
/*
- * 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.
+ * Cleanup eeprom register.
*/
- eeprom_93cx6_pulse_high(eeprom);
- eeprom_93cx6_pulse_low(eeprom);
+ eeprom_93cx6_cleanup(eeprom);
/*
* The data from the eeprom is stored as little endian,
@@ -208,3 +262,82 @@
eeprom_93cx6_read(eeprom, word + i, data++);
}
EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread);
+
+/**
+ * eeprom_93cx6_write - Write multiple words to the eeprom
+ * @eeprom: Pointer to eeprom structure
+ * @word: Word index from where we should start writing
+ * @data: Pointer where the information will be read from
+ *
+ * This function will write the eeprom data as little endian word
+ * from the given data pointer.
+ */
+void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom, const u8 word,
+ __le16 *data)
+{
+ u16 command;
+
+ /*
+ * select the ewen opcode.
+ */
+ eeprom_93cx6_ewen(eeprom);
+
+ /*
+ * Initialize the eeprom register
+ */
+ eeprom_93cx6_startup(eeprom);
+
+ /*
+ * Select the write opcode and the word to be read.
+ */
+ command = (PCI_EEPROM_WRITE_OPCODE << eeprom->width) | word;
+ eeprom_93cx6_write_bits(eeprom, command,
+ PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
+
+ /*
+ * Write the requested 16 bits.
+ */
+ eeprom_93cx6_write_bits(eeprom, *data, 16);
+
+ /*
+ * Cleanup eeprom register.
+ */
+ eeprom_93cx6_cleanup(eeprom);
+
+ /*
+ * Take a short break.
+ */
+ msleep(10000);
+
+ /*
+ * select the ewen opcode.
+ */
+ eeprom_93cx6_ewds(eeprom);
+
+ /*
+ * Cleanup eeprom register.
+ */
+ eeprom_93cx6_cleanup(eeprom);
+}
+EXPORT_SYMBOL_GPL(eeprom_93cx6_write);
+
+
+/**
+ * eeprom_93cx6_multiwrite - Write multiple words to the eeprom
+ * @eeprom: Pointer to eeprom structure
+ * @word: Word index from where we should start writing
+ * @data: Pointer where the information will be read from
+ * @words: Number of words that should be written.
+ *
+ * This function will write all requested words to the eeprom,
+ * this is done by calling eeprom_93cx6_write() multiple times.
+ */
+void eeprom_93cx6_multiwrite(struct eeprom_93cx6 *eeprom, const u8 word,
+ __le16 *data, const u16 words)
+{
+ unsigned int i;
+
+ for (i = 0; i < words; i++)
+ eeprom_93cx6_write(eeprom, word + i, data++);
+}
+EXPORT_SYMBOL_GPL(eeprom_93cx6_multiwrite);
-
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