u-boot/board/renesas/stout/cpld.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

166 lines
3.6 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Stout board CPLD access support
*
* Copyright (C) 2015 Renesas Electronics Europe GmbH
* Copyright (C) 2015 Renesas Electronics Corporation
* Copyright (C) 2015 Cogent Embedded, Inc.
*/
#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);
}