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@@ -0,0 +1,141 @@
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+/*
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+ * SPDX-License-Identifier: BSD-2-Clause
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+ *
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+ * Copyright (c) 2021 SiFive
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+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
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+ *
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+ * Authors:
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+ * Green Wan <green.wan@sifive.com>
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+ * Anup Patel <anup.patel@wdc.com>
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+ */
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+
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+#include <libfdt.h>
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+#include <sbi/sbi_console.h>
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+#include <sbi/sbi_ecall_interface.h>
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+#include <sbi/sbi_hart.h>
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+#include <sbi/sbi_system.h>
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+#include <sbi_utils/fdt/fdt_helper.h>
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+#include <sbi_utils/gpio/fdt_gpio.h>
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+#include <sbi_utils/reset/fdt_reset.h>
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+
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+struct gpio_reset {
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+ struct gpio_pin pin;
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+ u32 active_delay;
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+ u32 inactive_delay;
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+};
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+
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+static struct gpio_reset poweroff = {
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+ .active_delay = 100,
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+ .inactive_delay = 100
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+};
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+
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+static struct gpio_reset restart = {
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+ .active_delay = 100,
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+ .inactive_delay = 100
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+};
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+
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+/* Custom mdelay function until we have a generic mdelay() API */
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+static void gpio_mdelay(unsigned long msecs)
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+{
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+ volatile int i;
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+ while (msecs--)
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+ for (i = 0; i < 100000; i++) ;
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+}
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+
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+static int gpio_system_reset_check(u32 type, u32 reason)
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+{
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+ switch (type) {
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+ case SBI_SRST_RESET_TYPE_SHUTDOWN:
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+ case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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+ case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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+static void gpio_system_reset(u32 type, u32 reason)
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+{
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+ struct gpio_reset *reset = NULL;
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+
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+ switch (type) {
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+ case SBI_SRST_RESET_TYPE_SHUTDOWN:
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+ reset = &poweroff;
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+ break;
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+ case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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+ case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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+ reset = &restart;
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+ break;
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+ }
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+
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+ if (reset) {
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+ if (!reset->pin.chip) {
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+ sbi_printf("%s: gpio pin not available\n", __func__);
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+ goto skip_reset;
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+ }
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+
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+ /* drive it active, also inactive->active edge */
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+ gpio_direction_output(&reset->pin, 1);
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+ gpio_mdelay(reset->active_delay);
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+
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+ /* drive inactive, also active->inactive edge */
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+ gpio_set(&reset->pin, 0);
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+ gpio_mdelay(reset->inactive_delay);
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+
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+ /* drive it active, also inactive->active edge */
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+ gpio_set(&reset->pin, 1);
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+
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+skip_reset:
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+ /* hang !!! */
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+ sbi_hart_hang();
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+ }
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+}
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+
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+static struct sbi_system_reset_device gpio_reset = {
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+ .name = "gpio-reset",
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+ .system_reset_check = gpio_system_reset_check,
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+ .system_reset = gpio_system_reset
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+};
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+
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+static int gpio_reset_init(void *fdt, int nodeoff,
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+ const struct fdt_match *match)
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+{
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+ int rc, len;
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+ const fdt32_t *val;
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+ bool is_restart = (ulong)match->data;
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+ const char *dir_prop = (is_restart) ? "open-source" : "input";
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+ struct gpio_reset *reset = (is_restart) ? &restart : &poweroff;
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+
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+ rc = fdt_gpio_pin_get(fdt, nodeoff, 0, &reset->pin);
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+ if (rc)
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+ return rc;
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+
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+ if (fdt_getprop(fdt, nodeoff, dir_prop, &len)) {
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+ rc = gpio_direction_input(&reset->pin);
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+ if (rc)
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+ return rc;
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+ }
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+
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+ val = fdt_getprop(fdt, nodeoff, "active-delay-ms", &len);
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+ if (len > 0)
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+ reset->active_delay = fdt32_to_cpu(*val);
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+
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+ val = fdt_getprop(fdt, nodeoff, "inactive-delay-ms", &len);
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+ if (len > 0)
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+ reset->inactive_delay = fdt32_to_cpu(*val);
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+
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+ sbi_system_reset_set_device(&gpio_reset);
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+
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+ return 0;
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+}
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+
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+static const struct fdt_match gpio_reset_match[] = {
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+ { .compatible = "gpio-poweroff", .data = (void *)FALSE },
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+ { .compatible = "gpio-restart", .data = (void *)TRUE },
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+ { },
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+};
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+
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+struct fdt_reset fdt_reset_gpio = {
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+ .match_table = gpio_reset_match,
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+ .init = gpio_reset_init,
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+};
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