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u-boot/drivers/misc/ds4510.c
Wolfgang Denk 47e26b1bf9 cmd_usage(): simplify return code handling 
Lots of code use this construct:

	cmd_usage(cmdtp);
	return 1;

Change cmd_usage() let it return 1 - then we can replace all these
ocurrances by

	return cmd_usage(cmdtp);

This fixes a few places with incorrect return code handling, too.

Signed-off-by: Wolfgang Denk <wd@denx.de>
2010-07-24 20:43:57 +02:00

424 lines
9.8 KiB
C
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/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* 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 <ds4510.h>
/* Default to an address that hopefully won't corrupt other i2c devices */
#ifndef CONFIG_SYS_I2C_DS4510_ADDR
#define CONFIG_SYS_I2C_DS4510_ADDR (~0)
#endif
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
*/
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
*/
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
*/
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
*/
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
*/
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
*/
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
*/
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
*/
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
*/
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;
}
#ifdef CONFIG_CMD_DS4510
#ifdef CONFIG_CMD_DS4510_INFO
/*
* 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;
}
#endif /* CONFIG_CMD_DS4510_INFO */
cmd_tbl_t 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, "", ""),
#ifdef CONFIG_CMD_DS4510_INFO
U_BOOT_CMD_MKENT(info, 2, 0, (void *)DS4510_CMD_INFO, "", ""),
#endif
#ifdef CONFIG_CMD_DS4510_RST
U_BOOT_CMD_MKENT(rstdelay, 3, 0, (void *)DS4510_CMD_RSTDELAY, "", ""),
#endif
#ifdef CONFIG_CMD_DS4510_MEM
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, "", ""),
#endif
};
int do_ds4510(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
static uint8_t chip = CONFIG_SYS_I2C_DS4510_ADDR;
cmd_tbl_t *c;
ulong ul_arg2 = 0;
ulong ul_arg3 = 0;
int tmp;
#ifdef CONFIG_CMD_DS4510_MEM
ulong addr;
ulong off;
ulong cnt;
int end;
int (*rw_func)(uint8_t, int, uint8_t *, int);
#endif
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 = simple_strtoul(argv[2], NULL, 16);
/* arg3 used as output/pullup value */
if (argc > 3)
ul_arg3 = simple_strtoul(argv[3], NULL, 16);
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);
#ifdef CONFIG_CMD_DS4510_INFO
case DS4510_CMD_INFO:
return ds4510_info(chip);
#endif
#ifdef CONFIG_CMD_DS4510_RST
case DS4510_CMD_RSTDELAY:
return ds4510_rstdelay_write(chip, ul_arg2);
#endif
#ifdef CONFIG_CMD_DS4510_MEM
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;
#endif
default:
/* We should never get here... */
return 1;
}
#ifdef CONFIG_CMD_DS4510_MEM
/* 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 = simple_strtoul(argv[3], NULL, 16);
off += simple_strtoul(argv[4], NULL, 16);
cnt = simple_strtoul(argv[5], NULL, 16);
if ((off + cnt) > end) {
printf("ERROR: invalid len\n");
return -1;
}
return rw_func(chip, off, (uint8_t *)addr, cnt);
#endif
}
U_BOOT_CMD(
ds4510, 6, 1, do_ds4510,
"ds4510 eeprom/seeprom/sram/gpio access",
"device [dev]\n"
" - show or set current device address\n"
#ifdef CONFIG_CMD_DS4510_INFO
"ds4510 info\n"
" - display ds4510 info\n"
#endif
"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"
#ifdef CONFIG_CMD_DS4510_RST
"\n"
"ds4510 rstdelay 0-3\n"
" - set reset output delay"
#endif
#ifdef CONFIG_CMD_DS4510_MEM
"\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'"
#endif
);
#endif /* CONFIG_CMD_DS4510 */
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