7e5f460ec4
It is a pain to have to specify the value 16 in each call. Add a new hextoul() function and update the code to use it. Add a proper comment to simple_strtoul() while we are here. Signed-off-by: Simon Glass <sjg@chromium.org>
381 lines
8.6 KiB
C
381 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2008 Extreme Engineering Solutions, Inc.
|
|
*/
|
|
|
|
/*
|
|
* Driver for DS4510, a CPU supervisor with integrated EEPROM, SRAM,
|
|
* and 4 programmable non-volatile GPIO pins.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <command.h>
|
|
#include <linux/delay.h>
|
|
#include "ds4510.h"
|
|
|
|
enum {
|
|
DS4510_CMD_INFO,
|
|
DS4510_CMD_DEVICE,
|
|
DS4510_CMD_NV,
|
|
DS4510_CMD_RSTDELAY,
|
|
DS4510_CMD_OUTPUT,
|
|
DS4510_CMD_INPUT,
|
|
DS4510_CMD_PULLUP,
|
|
DS4510_CMD_EEPROM,
|
|
DS4510_CMD_SEEPROM,
|
|
DS4510_CMD_SRAM,
|
|
};
|
|
|
|
/*
|
|
* Write to DS4510, taking page boundaries into account
|
|
*/
|
|
static int ds4510_mem_write(uint8_t chip, int offset, uint8_t *buf, int count)
|
|
{
|
|
int wrlen;
|
|
int i = 0;
|
|
|
|
do {
|
|
wrlen = DS4510_EEPROM_PAGE_SIZE -
|
|
DS4510_EEPROM_PAGE_OFFSET(offset);
|
|
if (count < wrlen)
|
|
wrlen = count;
|
|
if (i2c_write(chip, offset, 1, &buf[i], wrlen))
|
|
return -1;
|
|
|
|
/*
|
|
* This delay isn't needed for SRAM writes but shouldn't delay
|
|
* things too much, so do it unconditionally for simplicity
|
|
*/
|
|
udelay(DS4510_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
|
|
count -= wrlen;
|
|
offset += wrlen;
|
|
i += wrlen;
|
|
} while (count > 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* General read from DS4510
|
|
*/
|
|
static int ds4510_mem_read(uint8_t chip, int offset, uint8_t *buf, int count)
|
|
{
|
|
return i2c_read(chip, offset, 1, buf, count);
|
|
}
|
|
|
|
/*
|
|
* Write SEE bit in config register.
|
|
* nv = 0 - Writes to SEEPROM registers behave like EEPROM
|
|
* nv = 1 - Writes to SEEPROM registers behave like SRAM
|
|
*/
|
|
static int ds4510_see_write(uint8_t chip, uint8_t nv)
|
|
{
|
|
uint8_t data;
|
|
|
|
if (i2c_read(chip, DS4510_CFG, 1, &data, 1))
|
|
return -1;
|
|
|
|
if (nv) /* Treat SEEPROM bits as EEPROM */
|
|
data &= ~DS4510_CFG_SEE;
|
|
else /* Treat SEEPROM bits as SRAM */
|
|
data |= DS4510_CFG_SEE;
|
|
|
|
return ds4510_mem_write(chip, DS4510_CFG, &data, 1);
|
|
}
|
|
|
|
/*
|
|
* Write de-assertion of reset signal delay
|
|
*/
|
|
static int ds4510_rstdelay_write(uint8_t chip, uint8_t delay)
|
|
{
|
|
uint8_t data;
|
|
|
|
if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1))
|
|
return -1;
|
|
|
|
data &= ~DS4510_RSTDELAY_MASK;
|
|
data |= delay & DS4510_RSTDELAY_MASK;
|
|
|
|
return ds4510_mem_write(chip, DS4510_RSTDELAY, &data, 1);
|
|
}
|
|
|
|
/*
|
|
* Write pullup characteristics of IO pins
|
|
*/
|
|
static int ds4510_pullup_write(uint8_t chip, uint8_t val)
|
|
{
|
|
val &= DS4510_IO_MASK;
|
|
|
|
return ds4510_mem_write(chip, DS4510_PULLUP, (uint8_t *)&val, 1);
|
|
}
|
|
|
|
/*
|
|
* Read pullup characteristics of IO pins
|
|
*/
|
|
static int ds4510_pullup_read(uint8_t chip)
|
|
{
|
|
uint8_t val;
|
|
|
|
if (i2c_read(chip, DS4510_PULLUP, 1, &val, 1))
|
|
return -1;
|
|
|
|
return val & DS4510_IO_MASK;
|
|
}
|
|
|
|
/*
|
|
* Write drive level of IO pins
|
|
*/
|
|
static int ds4510_gpio_write(uint8_t chip, uint8_t val)
|
|
{
|
|
uint8_t data;
|
|
int i;
|
|
|
|
for (i = 0; i < DS4510_NUM_IO; i++) {
|
|
if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1))
|
|
return -1;
|
|
|
|
if (val & (0x1 << i))
|
|
data |= 0x1;
|
|
else
|
|
data &= ~0x1;
|
|
|
|
if (ds4510_mem_write(chip, DS4510_IO0 - i, &data, 1))
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read drive level of IO pins
|
|
*/
|
|
static int ds4510_gpio_read(uint8_t chip)
|
|
{
|
|
uint8_t data;
|
|
int val = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < DS4510_NUM_IO; i++) {
|
|
if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1))
|
|
return -1;
|
|
|
|
if (data & 1)
|
|
val |= (1 << i);
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* Read physical level of IO pins
|
|
*/
|
|
static int ds4510_gpio_read_val(uint8_t chip)
|
|
{
|
|
uint8_t val;
|
|
|
|
if (i2c_read(chip, DS4510_IO_STATUS, 1, &val, 1))
|
|
return -1;
|
|
|
|
return val & DS4510_IO_MASK;
|
|
}
|
|
|
|
/*
|
|
* Display DS4510 information
|
|
*/
|
|
static int ds4510_info(uint8_t chip)
|
|
{
|
|
int i;
|
|
int tmp;
|
|
uint8_t data;
|
|
|
|
printf("DS4510 @ 0x%x:\n\n", chip);
|
|
|
|
if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1))
|
|
return -1;
|
|
printf("rstdelay = 0x%x\n\n", data & DS4510_RSTDELAY_MASK);
|
|
|
|
if (i2c_read(chip, DS4510_CFG, 1, &data, 1))
|
|
return -1;
|
|
printf("config = 0x%x\n", data);
|
|
printf(" /ready = %d\n", data & DS4510_CFG_READY ? 1 : 0);
|
|
printf(" trip pt = %d\n", data & DS4510_CFG_TRIP_POINT ? 1 : 0);
|
|
printf(" rst sts = %d\n", data & DS4510_CFG_RESET ? 1 : 0);
|
|
printf(" /see = %d\n", data & DS4510_CFG_SEE ? 1 : 0);
|
|
printf(" swrst = %d\n\n", data & DS4510_CFG_SWRST ? 1 : 0);
|
|
|
|
printf("gpio pins: 3210\n");
|
|
printf("---------------\n");
|
|
printf("pullup ");
|
|
|
|
tmp = ds4510_pullup_read(chip);
|
|
if (tmp == -1)
|
|
return tmp;
|
|
for (i = DS4510_NUM_IO - 1; i >= 0; i--)
|
|
printf("%d", (tmp & (1 << i)) ? 1 : 0);
|
|
printf("\n");
|
|
|
|
printf("driven ");
|
|
tmp = ds4510_gpio_read(chip);
|
|
if (tmp == -1)
|
|
return -1;
|
|
for (i = DS4510_NUM_IO - 1; i >= 0; i--)
|
|
printf("%d", (tmp & (1 << i)) ? 1 : 0);
|
|
printf("\n");
|
|
|
|
printf("read ");
|
|
tmp = ds4510_gpio_read_val(chip);
|
|
if (tmp == -1)
|
|
return -1;
|
|
for (i = DS4510_NUM_IO - 1; i >= 0; i--)
|
|
printf("%d", (tmp & (1 << i)) ? 1 : 0);
|
|
printf("\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct cmd_tbl cmd_ds4510[] = {
|
|
U_BOOT_CMD_MKENT(device, 3, 0, (void *)DS4510_CMD_DEVICE, "", ""),
|
|
U_BOOT_CMD_MKENT(nv, 3, 0, (void *)DS4510_CMD_NV, "", ""),
|
|
U_BOOT_CMD_MKENT(output, 4, 0, (void *)DS4510_CMD_OUTPUT, "", ""),
|
|
U_BOOT_CMD_MKENT(input, 3, 0, (void *)DS4510_CMD_INPUT, "", ""),
|
|
U_BOOT_CMD_MKENT(pullup, 4, 0, (void *)DS4510_CMD_PULLUP, "", ""),
|
|
U_BOOT_CMD_MKENT(info, 2, 0, (void *)DS4510_CMD_INFO, "", ""),
|
|
U_BOOT_CMD_MKENT(rstdelay, 3, 0, (void *)DS4510_CMD_RSTDELAY, "", ""),
|
|
U_BOOT_CMD_MKENT(eeprom, 6, 0, (void *)DS4510_CMD_EEPROM, "", ""),
|
|
U_BOOT_CMD_MKENT(seeprom, 6, 0, (void *)DS4510_CMD_SEEPROM, "", ""),
|
|
U_BOOT_CMD_MKENT(sram, 6, 0, (void *)DS4510_CMD_SRAM, "", ""),
|
|
};
|
|
|
|
int do_ds4510(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
|
|
{
|
|
static uint8_t chip = 0x51;
|
|
struct cmd_tbl *c;
|
|
ulong ul_arg2 = 0;
|
|
ulong ul_arg3 = 0;
|
|
int tmp;
|
|
ulong addr;
|
|
ulong off;
|
|
ulong cnt;
|
|
int end;
|
|
int (*rw_func)(uint8_t, int, uint8_t *, int);
|
|
|
|
c = find_cmd_tbl(argv[1], cmd_ds4510, ARRAY_SIZE(cmd_ds4510));
|
|
|
|
/* All commands but "device" require 'maxargs' arguments */
|
|
if (!c || !((argc == (c->maxargs)) ||
|
|
(((int)c->cmd == DS4510_CMD_DEVICE) &&
|
|
(argc == (c->maxargs - 1))))) {
|
|
return cmd_usage(cmdtp);
|
|
}
|
|
|
|
/* arg2 used as chip addr and pin number */
|
|
if (argc > 2)
|
|
ul_arg2 = hextoul(argv[2], NULL);
|
|
|
|
/* arg3 used as output/pullup value */
|
|
if (argc > 3)
|
|
ul_arg3 = hextoul(argv[3], NULL);
|
|
|
|
switch ((int)c->cmd) {
|
|
case DS4510_CMD_DEVICE:
|
|
if (argc == 3)
|
|
chip = ul_arg2;
|
|
printf("Current device address: 0x%x\n", chip);
|
|
return 0;
|
|
case DS4510_CMD_NV:
|
|
return ds4510_see_write(chip, ul_arg2);
|
|
case DS4510_CMD_OUTPUT:
|
|
tmp = ds4510_gpio_read(chip);
|
|
if (tmp == -1)
|
|
return -1;
|
|
if (ul_arg3)
|
|
tmp |= (1 << ul_arg2);
|
|
else
|
|
tmp &= ~(1 << ul_arg2);
|
|
return ds4510_gpio_write(chip, tmp);
|
|
case DS4510_CMD_INPUT:
|
|
tmp = ds4510_gpio_read_val(chip);
|
|
if (tmp == -1)
|
|
return -1;
|
|
return (tmp & (1 << ul_arg2)) != 0;
|
|
case DS4510_CMD_PULLUP:
|
|
tmp = ds4510_pullup_read(chip);
|
|
if (tmp == -1)
|
|
return -1;
|
|
if (ul_arg3)
|
|
tmp |= (1 << ul_arg2);
|
|
else
|
|
tmp &= ~(1 << ul_arg2);
|
|
return ds4510_pullup_write(chip, tmp);
|
|
case DS4510_CMD_INFO:
|
|
return ds4510_info(chip);
|
|
case DS4510_CMD_RSTDELAY:
|
|
return ds4510_rstdelay_write(chip, ul_arg2);
|
|
case DS4510_CMD_EEPROM:
|
|
end = DS4510_EEPROM + DS4510_EEPROM_SIZE;
|
|
off = DS4510_EEPROM;
|
|
break;
|
|
case DS4510_CMD_SEEPROM:
|
|
end = DS4510_SEEPROM + DS4510_SEEPROM_SIZE;
|
|
off = DS4510_SEEPROM;
|
|
break;
|
|
case DS4510_CMD_SRAM:
|
|
end = DS4510_SRAM + DS4510_SRAM_SIZE;
|
|
off = DS4510_SRAM;
|
|
break;
|
|
default:
|
|
/* We should never get here... */
|
|
return 1;
|
|
}
|
|
|
|
/* Only eeprom, seeprom, and sram commands should make it here */
|
|
if (strcmp(argv[2], "read") == 0)
|
|
rw_func = ds4510_mem_read;
|
|
else if (strcmp(argv[2], "write") == 0)
|
|
rw_func = ds4510_mem_write;
|
|
else
|
|
return cmd_usage(cmdtp);
|
|
|
|
addr = hextoul(argv[3], NULL);
|
|
off += hextoul(argv[4], NULL);
|
|
cnt = hextoul(argv[5], NULL);
|
|
|
|
if ((off + cnt) > end) {
|
|
printf("ERROR: invalid len\n");
|
|
return -1;
|
|
}
|
|
|
|
return rw_func(chip, off, (uint8_t *)addr, cnt);
|
|
}
|
|
|
|
U_BOOT_CMD(
|
|
ds4510, 6, 1, do_ds4510,
|
|
"ds4510 eeprom/seeprom/sram/gpio access",
|
|
"device [dev]\n"
|
|
" - show or set current device address\n"
|
|
"ds4510 info\n"
|
|
" - display ds4510 info\n"
|
|
"ds4510 output pin 0|1\n"
|
|
" - set pin low or high-Z\n"
|
|
"ds4510 input pin\n"
|
|
" - read value of pin\n"
|
|
"ds4510 pullup pin 0|1\n"
|
|
" - disable/enable pullup on specified pin\n"
|
|
"ds4510 nv 0|1\n"
|
|
" - make gpio and seeprom writes volatile/non-volatile"
|
|
"\n"
|
|
"ds4510 rstdelay 0-3\n"
|
|
" - set reset output delay"
|
|
"\n"
|
|
"ds4510 eeprom read addr off cnt\n"
|
|
"ds4510 eeprom write addr off cnt\n"
|
|
" - read/write 'cnt' bytes at EEPROM offset 'off'\n"
|
|
"ds4510 seeprom read addr off cnt\n"
|
|
"ds4510 seeprom write addr off cnt\n"
|
|
" - read/write 'cnt' bytes at SRAM-shadowed EEPROM offset 'off'\n"
|
|
"ds4510 sram read addr off cnt\n"
|
|
"ds4510 sram write addr off cnt\n"
|
|
" - read/write 'cnt' bytes at SRAM offset 'off'"
|
|
);
|