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// SPDX-License-Identifier: GPL-2.0+
/*
* common reset-controller functions for B&R boards
*
* Copyright (C) 2019 Hannes Schmelzer <oe5hpm@oevsv.at>
* B&R Industrial Automation GmbH - http://www.br-automation.com/ *
*/
#include <common.h>
#include <env.h>
#include <errno.h>
#include <i2c.h>
#include <dm/uclass.h>
#include <linux/delay.h>
#include "br_resetc.h"
/* I2C Address of controller */
#define RSTCTRL_ADDR_PSOC 0x75
#define RSTCTRL_ADDR_STM32 0x60
#define BMODE_DEFAULTAR 0
#define BMODE_SERVICE 2
#define BMODE_RUN 4
#define BMODE_PME 12
#define BMODE_DIAG 15
#define LCD_SETCURSOR(x, y)
#define LCD_PUTS(x)
static const char *bootmodeascii[16] = {
"BOOT", "reserved", "reserved", "reserved",
"RUN", "reserved", "reserved", "reserved",
"reserved", "reserved", "reserved", "reserved",
"PME", "reserved", "reserved", "DIAG",
};
struct br_reset_t {
struct udevice *i2cdev;
u8 is_psoc;
};
static struct br_reset_t resetc;
__weak int board_boot_key(void)
{
return 0;
}
__weak void board_boot_led(unsigned int on)
{
}
static int resetc_init(void)
{
struct udevice *i2cbus;
int rc;
rc = uclass_get_device_by_seq(UCLASS_I2C, 0, &i2cbus);
if (rc) {
printf("Cannot find I2C bus #0!\n");
return -1;
}
resetc.is_psoc = 1;
rc = dm_i2c_probe(i2cbus,
RSTCTRL_ADDR_PSOC, 0, &resetc.i2cdev);
if (rc) {
resetc.is_psoc = 0;
rc = dm_i2c_probe(i2cbus,
RSTCTRL_ADDR_STM32, 0, &resetc.i2cdev);
}
if (rc)
printf("Warning: cannot probe BuR resetcontroller!\n");
return rc;
}
int br_resetc_regget(u8 reg, u8 *dst)
{
int rc = 0;
if (!resetc.i2cdev)
rc = resetc_init();
if (rc != 0)
return rc;
return dm_i2c_read(resetc.i2cdev, reg, dst, 1);
}
int br_resetc_regset(u8 reg, u8 val)
{
int rc = 0;
u16 regw = (val << 8) | val;
if (!resetc.i2cdev)
rc = resetc_init();
if (rc != 0)
return rc;
if (resetc.is_psoc)
return dm_i2c_write(resetc.i2cdev, reg, (u8 *)®w, 2);
return dm_i2c_write(resetc.i2cdev, reg, (u8 *)®w, 1);
}
int br_resetc_bmode(void)
{
int rc = 0;
u16 regw;
u8 regb, scr;
int cnt;
unsigned int bmode = 0;
if (!resetc.i2cdev)
rc = resetc_init();
if (rc != 0)
return rc;
rc = dm_i2c_read(resetc.i2cdev, RSTCTRL_ENHSTATUS, ®b, 1);
if (rc != 0) {
printf("WARN: cannot read ENHSTATUS from resetcontroller!\n");
return -1;
}
rc = dm_i2c_read(resetc.i2cdev, RSTCTRL_SCRATCHREG0, &scr, 1);
if (rc != 0) {
printf("WARN: cannot read SCRATCHREG from resetcontroller!\n");
return -1;
}
board_boot_led(1);
/* special bootmode from resetcontroller */
if (regb & 0x4) {
bmode = BMODE_DIAG;
} else if (regb & 0x8) {
bmode = BMODE_DEFAULTAR;
} else if (board_boot_key() != 0) {
cnt = 4;
do {
LCD_SETCURSOR(1, 8);
switch (cnt) {
case 4:
LCD_PUTS
("release KEY to enter SERVICE-mode. ");
break;
case 3:
LCD_PUTS
("release KEY to enter DIAGNOSE-mode. ");
break;
case 2:
LCD_PUTS
("release KEY to enter BOOT-mode. ");
break;
}
mdelay(1000);
cnt--;
if (board_boot_key() == 0)
break;
} while (cnt);
switch (cnt) {
case 0:
bmode = BMODE_PME;
break;
case 1:
bmode = BMODE_DEFAULTAR;
break;
case 2:
bmode = BMODE_DIAG;
break;
case 3:
bmode = BMODE_SERVICE;
break;
}
} else if ((regb & 0x1) || scr == 0xCC) {
bmode = BMODE_PME;
} else {
bmode = BMODE_RUN;
}
LCD_SETCURSOR(1, 8);
switch (bmode) {
case BMODE_PME:
LCD_PUTS("entering PME-Mode (netscript). ");
regw = 0x0C0C;
break;
case BMODE_DEFAULTAR:
LCD_PUTS("entering BOOT-mode. ");
regw = 0x0000;
break;
case BMODE_DIAG:
LCD_PUTS("entering DIAGNOSE-mode. ");
regw = 0x0F0F;
break;
case BMODE_SERVICE:
LCD_PUTS("entering SERVICE mode. ");
regw = 0xB4B4;
break;
case BMODE_RUN:
LCD_PUTS("loading OS... ");
regw = 0x0404;
break;
}
board_boot_led(0);
if (resetc.is_psoc)
rc = dm_i2c_write(resetc.i2cdev, RSTCTRL_SCRATCHREG0,
(u8 *)®w, 2);
else
rc = dm_i2c_write(resetc.i2cdev, RSTCTRL_SCRATCHREG0,
(u8 *)®w, 1);
if (rc != 0)
printf("WARN: cannot write into resetcontroller!\n");
if (resetc.is_psoc)
printf("Reset: PSOC controller\n");
else
printf("Reset: STM32 controller\n");
printf("Mode: %s\n", bootmodeascii[regw & 0x0F]);
env_set_ulong("b_mode", regw & 0x0F);
return rc;
}
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