aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/lasat/at93c.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/lasat/at93c.c')
-rw-r--r--arch/mips/lasat/at93c.c148
1 files changed, 0 insertions, 148 deletions
diff --git a/arch/mips/lasat/at93c.c b/arch/mips/lasat/at93c.c
deleted file mode 100644
index ca26e554615..00000000000
--- a/arch/mips/lasat/at93c.c
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * Atmel AT93C46 serial eeprom driver
- *
- * Brian Murphy <brian.murphy@eicon.com>
- *
- */
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <asm/lasat/lasat.h>
-#include <linux/module.h>
-#include <linux/init.h>
-
-#include "at93c.h"
-
-#define AT93C_ADDR_SHIFT 7
-#define AT93C_ADDR_MAX ((1 << AT93C_ADDR_SHIFT) - 1)
-#define AT93C_RCMD (0x6 << AT93C_ADDR_SHIFT)
-#define AT93C_WCMD (0x5 << AT93C_ADDR_SHIFT)
-#define AT93C_WENCMD 0x260
-#define AT93C_WDSCMD 0x200
-
-struct at93c_defs *at93c;
-
-static void at93c_reg_write(u32 val)
-{
- *at93c->reg = val;
-}
-
-static u32 at93c_reg_read(void)
-{
- u32 tmp = *at93c->reg;
- return tmp;
-}
-
-static u32 at93c_datareg_read(void)
-{
- u32 tmp = *at93c->rdata_reg;
- return tmp;
-}
-
-static void at93c_cycle_clk(u32 data)
-{
- at93c_reg_write(data | at93c->clk);
- lasat_ndelay(250);
- at93c_reg_write(data & ~at93c->clk);
- lasat_ndelay(250);
-}
-
-static void at93c_write_databit(u8 bit)
-{
- u32 data = at93c_reg_read();
- if (bit)
- data |= 1 << at93c->wdata_shift;
- else
- data &= ~(1 << at93c->wdata_shift);
-
- at93c_reg_write(data);
- lasat_ndelay(100);
- at93c_cycle_clk(data);
-}
-
-static unsigned int at93c_read_databit(void)
-{
- u32 data;
-
- at93c_cycle_clk(at93c_reg_read());
- data = (at93c_datareg_read() >> at93c->rdata_shift) & 1;
- return data;
-}
-
-static u8 at93c_read_byte(void)
-{
- int i;
- u8 data = 0;
-
- for (i = 0; i<=7; i++) {
- data <<= 1;
- data |= at93c_read_databit();
- }
- return data;
-}
-
-static void at93c_write_bits(u32 data, int size)
-{
- int i;
- int shift = size - 1;
- u32 mask = (1 << shift);
-
- for (i = 0; i < size; i++) {
- at93c_write_databit((data & mask) >> shift);
- data <<= 1;
- }
-}
-
-static void at93c_init_op(void)
-{
- at93c_reg_write((at93c_reg_read() | at93c->cs) & ~at93c->clk & ~(1 << at93c->rdata_shift));
- lasat_ndelay(50);
-}
-
-static void at93c_end_op(void)
-{
- at93c_reg_write(at93c_reg_read() & ~at93c->cs);
- lasat_ndelay(250);
-}
-
-static void at93c_wait(void)
-{
- at93c_init_op();
- while (!at93c_read_databit())
- ;
- at93c_end_op();
-};
-
-static void at93c_disable_wp(void)
-{
- at93c_init_op();
- at93c_write_bits(AT93C_WENCMD, 10);
- at93c_end_op();
-}
-
-static void at93c_enable_wp(void)
-{
- at93c_init_op();
- at93c_write_bits(AT93C_WDSCMD, 10);
- at93c_end_op();
-}
-
-u8 at93c_read(u8 addr)
-{
- u8 byte;
- at93c_init_op();
- at93c_write_bits((addr & AT93C_ADDR_MAX)|AT93C_RCMD, 10);
- byte = at93c_read_byte();
- at93c_end_op();
- return byte;
-}
-
-void at93c_write(u8 addr, u8 data)
-{
- at93c_disable_wp();
- at93c_init_op();
- at93c_write_bits((addr & AT93C_ADDR_MAX)|AT93C_WCMD, 10);
- at93c_write_bits(data, 8);
- at93c_end_op();
- at93c_wait();
- at93c_enable_wp();
-}