From 1cb8e980c41e86760fa93de63f4e4cf643bef9d9 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Thu, 6 Mar 2003 21:55:29 +0000
Subject: =?UTF-8?q?*=20Patches=20by=20David=20M=FCller,=2031=20Jan=202003:?=
 =?UTF-8?q?=20=20=20-=20minimal=20setup=20for=20CardBus=20bridges=20=20=20?=
 =?UTF-8?q?-=20add=20EEPROM=20read/write=20support=20in=20the=20CS8900=20d?=
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* Patch by Steven Scholz, 04 Feb 2003:
  add support for RTC DS1307

* Patch by Reinhard Meyer, 5 Feb 2003:
  fix PLPRCR/SCCR init sequence on 8xx to allow for
  changes of EBDF by software

* Patch by Vladimir Gurevich, 07 Feb 2003:
  "API-compatibility patch" for 4xx I2C driver
---
 drivers/cs8900.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'drivers/cs8900.c')

diff --git a/drivers/cs8900.c b/drivers/cs8900.c
index 7165d60..224ab95 100644
--- a/drivers/cs8900.c
+++ b/drivers/cs8900.c
@@ -272,6 +272,44 @@ retry:
 	return 0;
 }
 
+static void cs8900_e2prom_ready(void)
+{
+	while(get_reg(PP_SelfST) & SI_BUSY);
+}
+
+/***********************************************************/
+/* read a 16-bit word out of the EEPROM                    */
+/***********************************************************/
+
+int cs8900_e2prom_read(unsigned char addr, unsigned short *value)
+{
+	cs8900_e2prom_ready();
+	put_reg(PP_EECMD, EEPROM_READ_CMD | addr);
+	cs8900_e2prom_ready();
+	*value = get_reg(PP_EEData);
+
+	return 0;
+}
+
+
+/***********************************************************/
+/* write a 16-bit word into the EEPROM                     */
+/***********************************************************/
+
+void cs8900_e2prom_write(unsigned char addr, unsigned short value)
+{
+	cs8900_e2prom_ready();
+	put_reg(PP_EECMD, EEPROM_WRITE_EN);
+	cs8900_e2prom_ready();
+	put_reg(PP_EEData, value);
+	put_reg(PP_EECMD, EEPROM_WRITE_CMD | addr);
+	cs8900_e2prom_ready();
+	put_reg(PP_EECMD, EEPROM_WRITE_DIS);
+	cs8900_e2prom_ready();
+
+	return 0;
+}
+
 #endif	/* COMMANDS & CFG_NET */
 
 #endif	/* CONFIG_DRIVER_CS8900 */
-- 
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