1 files changed, 99 insertions, 0 deletions

diff --git a/arch/mips/txx9/rbtx4938/spi_eeprom.c b/arch/mips/txx9/rbtx4938/spi_eeprom.c
new file mode 100644
index 000000000000..a7ea8b041c1d
--- /dev/null
+++ b/arch/mips/txx9/rbtx4938/spi_eeprom.c
@@ -0,0 +1,99 @@
+/*
+ * spi_eeprom.c
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/eeprom.h>
+#include <asm/txx9/spi.h>
+
+#define AT250X0_PAGE_SIZE       8
+
+/* register board information for at25 driver */
+int __init spi_eeprom_register(int chipid)
+{
+        static struct spi_eeprom eeprom = {
+                .name = "at250x0",
+                .byte_len = 128,
+                .page_size = AT250X0_PAGE_SIZE,
+                .flags = EE_ADDR1,
+        };
+        struct spi_board_info info = {
+                .modalias = "at25",
+                .max_speed_hz = 1500000,        /* 1.5Mbps */
+                .bus_num = 0,
+                .chip_select = chipid,
+                .platform_data = &eeprom,
+                /* Mode 0: High-Active, Sample-Then-Shift */
+        };
+
+        return spi_register_board_info(&info, 1);
+}
+
+/* simple temporary spi driver to provide early access to seeprom. */
+
+static struct read_param {
+        int chipid;
+        int address;
+        unsigned char *buf;
+        int len;
+} *read_param;
+
+static int __init early_seeprom_probe(struct spi_device *spi)
+{
+        int stat = 0;
+        u8 cmd[2];
+        int len = read_param->len;
+        char *buf = read_param->buf;
+        int address = read_param->address;
+
+        dev_info(&spi->dev, "spiclk %u KHz.\n",
+                 (spi->max_speed_hz + 500) / 1000);
+        if (read_param->chipid != spi->chip_select)
+                return -ENODEV;
+        while (len > 0) {
+                /* spi_write_then_read can only work with small chunk */
+                int c = len < AT250X0_PAGE_SIZE ? len : AT250X0_PAGE_SIZE;
+                cmd[0] = 0x03;  /* AT25_READ */
+                cmd[1] = address;
+                stat = spi_write_then_read(spi, cmd, sizeof(cmd), buf, c);
+                buf += c;
+                len -= c;
+                address += c;
+        }
+        return stat;
+}
+
+static struct spi_driver early_seeprom_driver __initdata = {
+        .driver = {
+                .name   = "at25",
+                .owner  = THIS_MODULE,
+        },
+        .probe  = early_seeprom_probe,
+};
+
+int __init spi_eeprom_read(int chipid, int address,
+                           unsigned char *buf, int len)
+{
+        int ret;
+        struct read_param param = {
+                .chipid = chipid,
+                .address = address,
+                .buf = buf,
+                .len = len
+        };
+
+        read_param = &param;
+        ret = spi_register_driver(&early_seeprom_driver);
+        if (!ret)
+                spi_unregister_driver(&early_seeprom_driver);
+        return ret;
+}