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u-boot/drivers/misc/ds4510.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

379 lines
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// 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 "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;
}
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, "", ""),
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(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
static uint8_t chip = 0x51;
cmd_tbl_t *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 = 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);
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 = 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);
}
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'"
);
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