--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * V3MSK board CPLD access support
+ *
+ * Copyright (C) 2019 Renesas Electronics Corporation
+ * Copyright (C) 2019 Cogent Embedded, Inc.
+ *
+ */
+
+#include <common.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <errno.h>
+#include <linux/err.h>
+#include <sysreset.h>
+#include <linux/delay.h>
+#include <command.h>
+
+#define CPLD_ADDR_PRODUCT_L 0x000 /* R */
+#define CPLD_ADDR_PRODUCT_H 0x001 /* R */
+#define CPLD_ADDR_CPLD_VERSION_D 0x002 /* R */
+#define CPLD_ADDR_CPLD_VERSION_Y 0x003 /* R */
+#define CPLD_ADDR_MODE_SET_L 0x004 /* R/W */
+#define CPLD_ADDR_MODE_SET_H 0x005 /* R/W */
+#define CPLD_ADDR_MODE_APPLIED_L 0x006 /* R */
+#define CPLD_ADDR_MODE_APPLIED_H 0x007 /* R */
+#define CPLD_ADDR_DIPSW 0x008 /* R */
+#define CPLD_ADDR_RESET 0x00A /* R/W */
+#define CPLD_ADDR_POWER_CFG 0x00B /* R/W */
+#define CPLD_ADDR_PERI_CFG1 0x00C /* R/W */
+#define CPLD_ADDR_PERI_CFG2 0x00D /* R/W */
+#define CPLD_ADDR_LEDS 0x00E /* R/W */
+#define CPLD_ADDR_PCB_VERSION 0x300 /* R */
+#define CPLD_ADDR_SOC_VERSION 0x301 /* R */
+#define CPLD_ADDR_PCB_SN_L 0x302 /* R */
+#define CPLD_ADDR_PCB_SN_H 0x303 /* R */
+
+#define MDIO_DELAY 10 /* microseconds */
+
+#define CPLD_MAX_GPIOS 2
+
+struct renesas_v3msk_sysreset_priv {
+ struct gpio_desc miso;
+ struct gpio_desc mosi;
+ struct gpio_desc mdc;
+ struct gpio_desc enablez;
+ /*
+ * V3MSK Videobox Mini board has CANFD PHY connected
+ * we must shutdown this chip to use bb pins
+ */
+ struct gpio_desc gpios[CPLD_MAX_GPIOS];
+};
+
+static void mdio_bb_active_mdio(struct renesas_v3msk_sysreset_priv *priv)
+{
+ dm_gpio_set_dir_flags(&priv->mosi, GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+}
+
+static void mdio_bb_tristate_mdio(struct renesas_v3msk_sysreset_priv *priv)
+{
+ dm_gpio_set_dir_flags(&priv->mosi, GPIOD_IS_IN);
+}
+
+static void mdio_bb_set_mdio(struct renesas_v3msk_sysreset_priv *priv, int val)
+{
+ dm_gpio_set_value(&priv->mosi, val);
+}
+
+static int mdio_bb_get_mdio(struct renesas_v3msk_sysreset_priv *priv)
+{
+ return dm_gpio_get_value(&priv->miso);
+}
+
+static void mdio_bb_set_mdc(struct renesas_v3msk_sysreset_priv *priv, int val)
+{
+ dm_gpio_set_value(&priv->mdc, val);
+}
+
+static void mdio_bb_delay(void)
+{
+ udelay(MDIO_DELAY);
+}
+
+/* Send the preamble, address, and register (common to read and write) */
+static void mdio_bb_pre(struct renesas_v3msk_sysreset_priv *priv,
+ u8 op, u8 addr, u8 reg)
+{
+ int i;
+
+ /* 32-bit preamble */
+ mdio_bb_active_mdio(priv);
+ mdio_bb_set_mdio(priv, 1);
+ for (i = 0; i < 32; i++) {
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ }
+ /* send the ST (2-bits of '01') */
+ mdio_bb_set_mdio(priv, 0);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ mdio_bb_set_mdio(priv, 1);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ /* send the OP (2-bits of Opcode: '10'-read, '01'-write) */
+ mdio_bb_set_mdio(priv, op >> 1);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ mdio_bb_set_mdio(priv, op & 1);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ /* send the PA5 (5-bits of PHY address) */
+ for (i = 0; i < 5; i++) {
+ mdio_bb_set_mdio(priv, addr & 0x10); /* MSB first */
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ addr <<= 1;
+ }
+ /* send the RA5 (5-bits of register address) */
+ for (i = 0; i < 5; i++) {
+ mdio_bb_set_mdio(priv, reg & 0x10); /* MSB first */
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ reg <<= 1;
+ }
+}
+
+static int mdio_bb_read(struct renesas_v3msk_sysreset_priv *priv,
+ u8 addr, u8 reg)
+{
+ int i;
+ u16 data = 0;
+
+ mdio_bb_pre(priv, 2, addr, reg);
+ /* tri-state MDIO */
+ mdio_bb_tristate_mdio(priv);
+ /* read TA (2-bits of turn-around, last bit must be '0') */
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ /* check the turnaround bit: the PHY should drive line to zero */
+ if (mdio_bb_get_mdio(priv) != 0) {
+ printf("PHY didn't drive TA low\n");
+ for (i = 0; i < 32; i++) {
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ }
+ /* There is no PHY, set value to 0xFFFF */
+ return 0xFFFF;
+ }
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ /* read 16-bits of data */
+ for (i = 0; i < 16; i++) {
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ data <<= 1;
+ data |= mdio_bb_get_mdio(priv);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ }
+
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+
+ debug("cpld_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, data);
+
+ return data;
+}
+
+static void mdio_bb_write(struct renesas_v3msk_sysreset_priv *priv,
+ u8 addr, u8 reg, u16 val)
+{
+ int i;
+
+ mdio_bb_pre(priv, 1, addr, reg);
+ /* send the TA (2-bits of turn-around '10') */
+ mdio_bb_set_mdio(priv, 1);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ mdio_bb_set_mdio(priv, 0);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ /* write 16-bits of data */
+ for (i = 0; i < 16; i++) {
+ mdio_bb_set_mdio(priv, val & 0x8000); /* MSB first */
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+ val <<= 1;
+ }
+ /* tri-state MDIO */
+ mdio_bb_tristate_mdio(priv);
+ mdio_bb_set_mdc(priv, 0);
+ mdio_bb_delay();
+ mdio_bb_set_mdc(priv, 1);
+ mdio_bb_delay();
+}
+
+static u16 cpld_read(struct udevice *dev, u16 addr)
+{
+ struct renesas_v3msk_sysreset_priv *priv = dev_get_priv(dev);
+
+ /* random flash reads require 2 reads: first read is unreliable */
+ if (addr >= CPLD_ADDR_PCB_VERSION)
+ mdio_bb_read(priv, addr >> 5, addr & 0x1f);
+
+ return mdio_bb_read(priv, addr >> 5, addr & 0x1f);
+}
+
+static void cpld_write(struct udevice *dev, u16 addr, u16 data)
+{
+ struct renesas_v3msk_sysreset_priv *priv = dev_get_priv(dev);
+
+ mdio_bb_write(priv, addr >> 5, addr & 0x1f, data);
+}
+
+static int do_cpld(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
+{
+ struct udevice *dev;
+ u16 addr, val;
+ int ret;
+
+ ret = uclass_get_device_by_driver(UCLASS_SYSRESET,
+ DM_DRIVER_GET(sysreset_renesas_v3msk),
+ &dev);
+ if (ret)
+ return ret;
+
+ if (argc == 2 && strcmp(argv[1], "info") == 0) {
+ printf("Product: 0x%08x\n",
+ (cpld_read(dev, CPLD_ADDR_PRODUCT_H) << 16) |
+ cpld_read(dev, CPLD_ADDR_PRODUCT_L));
+ printf("CPLD version: 0x%08x\n",
+ (cpld_read(dev, CPLD_ADDR_CPLD_VERSION_Y) << 16) |
+ cpld_read(dev, CPLD_ADDR_CPLD_VERSION_D));
+ printf("Mode setting (MD0..26): 0x%08x\n",
+ (cpld_read(dev, CPLD_ADDR_MODE_APPLIED_H) << 16) |
+ cpld_read(dev, CPLD_ADDR_MODE_APPLIED_L));
+ printf("DIPSW (SW4, SW5): 0x%02x, 0x%x\n",
+ (cpld_read(dev, CPLD_ADDR_DIPSW) & 0xff) ^ 0xff,
+ (cpld_read(dev, CPLD_ADDR_DIPSW) >> 8) ^ 0xf);
+ printf("Power config: 0x%08x\n",
+ cpld_read(dev, CPLD_ADDR_POWER_CFG));
+ printf("Periferals config: 0x%08x\n",
+ (cpld_read(dev, CPLD_ADDR_PERI_CFG2) << 16) |
+ cpld_read(dev, CPLD_ADDR_PERI_CFG1));
+ printf("PCB version: %d.%d\n",
+ cpld_read(dev, CPLD_ADDR_PCB_VERSION) >> 8,
+ cpld_read(dev, CPLD_ADDR_PCB_VERSION) & 0xff);
+ printf("SOC version: %d.%d\n",
+ cpld_read(dev, CPLD_ADDR_SOC_VERSION) >> 8,
+ cpld_read(dev, CPLD_ADDR_SOC_VERSION) & 0xff);
+ printf("PCB S/N: %d\n",
+ (cpld_read(dev, CPLD_ADDR_PCB_SN_H) << 16) |
+ cpld_read(dev, CPLD_ADDR_PCB_SN_L));
+ return 0;
+ }
+
+ if (argc < 3)
+ return CMD_RET_USAGE;
+
+ addr = simple_strtoul(argv[2], NULL, 16);
+ if (!(addr >= CPLD_ADDR_PRODUCT_L && addr <= CPLD_ADDR_LEDS)) {
+ printf("cpld invalid addr\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_v3msk_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+ cpld_write(dev, CPLD_ADDR_RESET, 1);
+
+ return -EINPROGRESS;
+}
+
+static int renesas_v3msk_sysreset_probe(struct udevice *dev)
+{
+ struct renesas_v3msk_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-mosi", 0, &priv->mosi,
+ GPIOD_IS_OUT))
+ return -EINVAL;
+
+ if (gpio_request_by_name(dev, "gpio-mdc", 0, &priv->mdc,
+ GPIOD_IS_OUT))
+ return -EINVAL;
+
+ if (gpio_request_by_name(dev, "gpio-enablez", 0, &priv->enablez,
+ GPIOD_IS_OUT))
+ return -EINVAL;
+
+ /* V3MSK Videobox Mini board has CANFD PHY connected
+ * we must shutdown this chip to use bb pins
+ */
+ gpio_request_list_by_name(dev, "gpios", priv->gpios, CPLD_MAX_GPIOS,
+ GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+
+ return 0;
+}
+
+static struct sysreset_ops renesas_v3msk_sysreset = {
+ .request = renesas_v3msk_sysreset_request,
+};
+
+static const struct udevice_id renesas_v3msk_sysreset_ids[] = {
+ { .compatible = "renesas,v3msk-cpld" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(sysreset_renesas_v3msk) = {
+ .name = "renesas_v3msk_sysreset",
+ .id = UCLASS_SYSRESET,
+ .ops = &renesas_v3msk_sysreset,
+ .probe = renesas_v3msk_sysreset_probe,
+ .of_match = renesas_v3msk_sysreset_ids,
+ .priv_auto = sizeof(struct renesas_v3msk_sysreset_priv),
+};
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