diff options
Diffstat (limited to 'roms/u-boot/board/renesas/ulcb/cpld.c')
| -rw-r--r-- | roms/u-boot/board/renesas/ulcb/cpld.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/roms/u-boot/board/renesas/ulcb/cpld.c b/roms/u-boot/board/renesas/ulcb/cpld.c new file mode 100644 index 000000000..ebb2d6f74 --- /dev/null +++ b/roms/u-boot/board/renesas/ulcb/cpld.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * ULCB board CPLD access support + * + * Copyright (C) 2017 Renesas Electronics Corporation + * Copyright (C) 2017 Cogent Embedded, Inc. + */ + +#include <common.h> +#include <command.h> +#include <asm/gpio.h> +#include <asm/io.h> +#include <dm.h> +#include <errno.h> +#include <linux/err.h> +#include <sysreset.h> + +#define CPLD_ADDR_MODE 0x00 /* RW */ +#define CPLD_ADDR_MUX 0x02 /* RW */ +#define CPLD_ADDR_DIPSW6 0x08 /* R */ +#define CPLD_ADDR_RESET 0x80 /* RW */ +#define CPLD_ADDR_VERSION 0xFF /* R */ + +struct renesas_ulcb_sysreset_priv { + struct gpio_desc miso; + struct gpio_desc mosi; + struct gpio_desc sck; + struct gpio_desc sstbz; +}; + +static u32 cpld_read(struct udevice *dev, u8 addr) +{ + struct renesas_ulcb_sysreset_priv *priv = dev_get_priv(dev); + u32 data = 0; + int i; + + for (i = 0; i < 8; i++) { + dm_gpio_set_value(&priv->mosi, !!(addr & 0x80)); /* MSB first */ + dm_gpio_set_value(&priv->sck, 1); + addr <<= 1; + dm_gpio_set_value(&priv->sck, 0); + } + + dm_gpio_set_value(&priv->mosi, 0); /* READ */ + dm_gpio_set_value(&priv->sstbz, 0); + dm_gpio_set_value(&priv->sck, 1); + dm_gpio_set_value(&priv->sck, 0); + dm_gpio_set_value(&priv->sstbz, 1); + + for (i = 0; i < 32; i++) { + dm_gpio_set_value(&priv->sck, 1); + data <<= 1; + data |= dm_gpio_get_value(&priv->miso); /* MSB first */ + dm_gpio_set_value(&priv->sck, 0); + } + + return data; +} + +static void cpld_write(struct udevice *dev, u8 addr, u32 data) +{ + struct renesas_ulcb_sysreset_priv *priv = dev_get_priv(dev); + int i; + + for (i = 0; i < 32; i++) { + dm_gpio_set_value(&priv->mosi, data & (1 << 31)); /* MSB first */ + dm_gpio_set_value(&priv->sck, 1); + data <<= 1; + dm_gpio_set_value(&priv->sck, 0); + } + + for (i = 0; i < 8; i++) { + dm_gpio_set_value(&priv->mosi, addr & 0x80); /* MSB first */ + dm_gpio_set_value(&priv->sck, 1); + addr <<= 1; + dm_gpio_set_value(&priv->sck, 0); + } + + dm_gpio_set_value(&priv->mosi, 1); /* WRITE */ + dm_gpio_set_value(&priv->sstbz, 0); + dm_gpio_set_value(&priv->sck, 1); + dm_gpio_set_value(&priv->sck, 0); + dm_gpio_set_value(&priv->sstbz, 1); +} + +static int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + struct udevice *dev; + u32 addr, val; + int ret; + + ret = uclass_get_device_by_driver(UCLASS_SYSRESET, + DM_DRIVER_GET(sysreset_renesas_ulcb), + &dev); + if (ret) + return ret; + + if (argc == 2 && strcmp(argv[1], "info") == 0) { + printf("CPLD version:\t\t\t0x%08x\n", + cpld_read(dev, CPLD_ADDR_VERSION)); + printf("H3 Mode setting (MD0..28):\t0x%08x\n", + cpld_read(dev, CPLD_ADDR_MODE)); + printf("Multiplexer settings:\t\t0x%08x\n", + cpld_read(dev, CPLD_ADDR_MUX)); + printf("DIPSW (SW6):\t\t\t0x%08x\n", + cpld_read(dev, CPLD_ADDR_DIPSW6)); + return 0; + } + + 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_DIPSW6 || + addr == CPLD_ADDR_RESET)) { + printf("Invalid CPLD register address\n"); + return CMD_RET_USAGE; + } + + if (argc == 3 && strcmp(argv[1], "read") == 0) { + printf("0x%x\n", cpld_read(dev, addr)); + } else if (argc == 4 && strcmp(argv[1], "write") == 0) { + val = simple_strtoul(argv[3], NULL, 16); + cpld_write(dev, addr, val); + } + + return 0; +} + +U_BOOT_CMD( + cpld, 4, 1, do_cpld, + "CPLD access", + "info\n" + "cpld read addr\n" + "cpld write addr val\n" +); + +static int renesas_ulcb_sysreset_request(struct udevice *dev, enum sysreset_t type) +{ + cpld_write(dev, CPLD_ADDR_RESET, 1); + + return -EINPROGRESS; +} + +static int renesas_ulcb_sysreset_probe(struct udevice *dev) +{ + struct renesas_ulcb_sysreset_priv *priv = dev_get_priv(dev); + + if (gpio_request_by_name(dev, "gpio-miso", 0, &priv->miso, + GPIOD_IS_IN)) + return -EINVAL; + + if (gpio_request_by_name(dev, "gpio-sck", 0, &priv->sck, + GPIOD_IS_OUT)) + return -EINVAL; + + if (gpio_request_by_name(dev, "gpio-sstbz", 0, &priv->sstbz, + GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE)) + return -EINVAL; + + if (gpio_request_by_name(dev, "gpio-mosi", 0, &priv->mosi, + GPIOD_IS_OUT)) + return -EINVAL; + + /* PULL-UP on MISO line */ + setbits_le32(PFC_PUEN5, PUEN_SSI_SDATA4); + + /* Dummy read */ + cpld_read(dev, CPLD_ADDR_VERSION); + + return 0; +} + +static struct sysreset_ops renesas_ulcb_sysreset = { + .request = renesas_ulcb_sysreset_request, +}; + +static const struct udevice_id renesas_ulcb_sysreset_ids[] = { + { .compatible = "renesas,ulcb-cpld" }, + { } +}; + +U_BOOT_DRIVER(sysreset_renesas_ulcb) = { + .name = "renesas_ulcb_sysreset", + .id = UCLASS_SYSRESET, + .ops = &renesas_ulcb_sysreset, + .probe = renesas_ulcb_sysreset_probe, + .of_match = renesas_ulcb_sysreset_ids, + .priv_auto = sizeof(struct renesas_ulcb_sysreset_priv), +}; |