diff options
Diffstat (limited to 'arch/mips/lasat/at93c.c')
-rw-r--r-- | arch/mips/lasat/at93c.c | 148 |
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 f895fe94b937..000000000000 --- a/arch/mips/lasat/at93c.c +++ /dev/null @@ -1,148 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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 "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(); -} |