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/*
* Stout board CPLD access support
*
* Copyright (C) 2015 Renesas Electronics Europe GmbH
* Copyright (C) 2015 Renesas Electronics Corporation
* Copyright (C) 2015 Cogent Embedded, Inc.
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include "cpld.h"
#define SCLK (92 + 24)
#define SSTBZ (92 + 25)
#define MOSI (92 + 26)
#define MISO (92 + 27)
#define CPLD_ADDR_MODE 0x00 /* RW */
#define CPLD_ADDR_MUX 0x01 /* RW */
#define CPLD_ADDR_HDMI 0x02 /* RW */
#define CPLD_ADDR_DIPSW 0x08 /* R */
#define CPLD_ADDR_RESET 0x80 /* RW */
#define CPLD_ADDR_VERSION 0xFF /* R */
static u32 cpld_read(u8 addr)
{
int i;
u32 data = 0;
for (i = 0; i < 8; i++) {
gpio_set_value(MOSI, addr & 0x80); /* MSB first */
gpio_set_value(SCLK, 1);
addr <<= 1;
gpio_set_value(SCLK, 0);
}
gpio_set_value(MOSI, 0); /* READ */
gpio_set_value(SSTBZ, 0);
gpio_set_value(SCLK, 1);
gpio_set_value(SCLK, 0);
gpio_set_value(SSTBZ, 1);
for (i = 0; i < 32; i++) {
gpio_set_value(SCLK, 1);
data <<= 1;
data |= gpio_get_value(MISO); /* MSB first */
gpio_set_value(SCLK, 0);
}
return data;
}
static void cpld_write(u8 addr, u32 data)
{
int i;
for (i = 0; i < 32; i++) {
gpio_set_value(MOSI, data & (1 << 31)); /* MSB first */
gpio_set_value(SCLK, 1);
data <<= 1;
gpio_set_value(SCLK, 0);
}
for (i = 0; i < 8; i++) {
gpio_set_value(MOSI, addr & 0x80); /* MSB first */
gpio_set_value(SCLK, 1);
addr <<= 1;
gpio_set_value(SCLK, 0);
}
gpio_set_value(MOSI, 1); /* WRITE */
gpio_set_value(SSTBZ, 0);
gpio_set_value(SCLK, 1);
gpio_set_value(SCLK, 0);
gpio_set_value(SSTBZ, 1);
}
/* LSI pin pull-up control */
#define PUPR3 0xe606010C
#define PUPR3_SD3_DAT1 (1 << 27)
void cpld_init(void)
{
u32 val;
/* PULL-UP on MISO line */
val = readl(PUPR3);
val |= PUPR3_SD3_DAT1;
writel(val, PUPR3);
gpio_request(SCLK, "SCLK");
gpio_request(SSTBZ, "SSTBZ");
gpio_request(MOSI, "MOSI");
gpio_request(MISO, "MISO");
gpio_direction_output(SCLK, 0);
gpio_direction_output(SSTBZ, 1);
gpio_direction_output(MOSI, 0);
gpio_direction_input(MISO);
/* dummy read */
cpld_read(CPLD_ADDR_VERSION);
printf("CPLD version: 0x%08x\n",
cpld_read(CPLD_ADDR_VERSION));
printf("H2 Mode setting (MD0..28): 0x%08x\n",
cpld_read(CPLD_ADDR_MODE));
printf("Multiplexer settings: 0x%08x\n",
cpld_read(CPLD_ADDR_MUX));
printf("HDMI setting: 0x%08x\n",
cpld_read(CPLD_ADDR_HDMI));
printf("DIPSW (SW3): 0x%08x\n",
cpld_read(CPLD_ADDR_DIPSW));
#ifdef CONFIG_SH_SDHI
/* switch MUX to SD0 */
val = cpld_read(CPLD_ADDR_MUX);
val &= ~MUX_MSK_SD0;
val |= MUX_VAL_SD0;
cpld_write(CPLD_ADDR_MUX, val);
#endif
}
static int do_cpld(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
u32 addr, val;
if (argc < 3)
return CMD_RET_USAGE;
addr = simple_strtoul(argv[2], NULL, 16);
if (!(addr == CPLD_ADDR_VERSION || addr == CPLD_ADDR_MODE ||
addr == CPLD_ADDR_MUX || addr == CPLD_ADDR_HDMI ||
addr == CPLD_ADDR_DIPSW || addr == CPLD_ADDR_RESET)) {
printf("cpld invalid addr\n");
return CMD_RET_USAGE;
}
if (argc == 3 && strcmp(argv[1], "read") == 0) {
printf("0x%x\n", cpld_read(addr));
} else if (argc == 4 && strcmp(argv[1], "write") == 0) {
val = simple_strtoul(argv[3], NULL, 16);
if (addr == CPLD_ADDR_MUX) {
/* never mask SCIFA0 console */
val &= ~MUX_MSK_SCIFA0_USB;
val |= MUX_VAL_SCIFA0_USB;
}
cpld_write(addr, val);
}
return 0;
}
U_BOOT_CMD(
cpld, 4, 1, do_cpld,
"CPLD access",
"read addr\n"
"cpld write addr val\n"
);
void reset_cpu(ulong addr)
{
cpld_write(CPLD_ADDR_RESET, 1);
}
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