forked from Mirrors/opensbi
8234fc1bdf
Add ATCWDT200 as reset device of AE350 platform, this driver requires
SMU to program the reset vector registers before triggering WDT software
restart signal.
dts example:
smu@f0100000 {
compatible = "andestech,atcsmu";
reg = <0x00000000 0xf0100000 0x00000000 0x00001000>;
};
wdt: wdt@f0500000 {
compatible = "andestech,atcwdt200";
reg = <0x00000000 0xf0500000 0x00000000 0x00001000>;
interrupts = <3 4>;
interrupt-parent = <&plic0>;
clock-frequency = <15000000>;
};
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Andes Technology Corporation
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*
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* Authors:
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* Yu Chien Peter Lin <peterlin@andestech.com>
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*/
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#include <libfdt.h>
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#include <sbi/riscv_io.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_hart.h>
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#include <sbi/sbi_platform.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/reset/fdt_reset.h>
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#define ATCWDT200_WP_NUM 0x5aa5
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#define WREN_REG 0x18
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#define CTRL_REG 0x10
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#define RST_TIME_OFF 8
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#define RST_TIME_MSK (0x3 << RST_TIME_OFF)
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#define RST_CLK_128 (0 << RST_TIME_OFF)
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#define RST_CLK_256 (1 << RST_TIME_OFF)
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#define RST_CLK_512 (2 << RST_TIME_OFF)
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#define RST_CLK_1024 (3 << RST_TIME_OFF)
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#define INT_TIME_OFF 4
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#define INT_TIME_MSK (0xf << INT_TIME_OFF)
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#define INT_CLK_64 (0 << INT_TIME_OFF)
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#define INT_CLK_256 (1 << INT_TIME_OFF)
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#define INT_CLK_1024 (2 << INT_TIME_OFF)
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#define INT_CLK_2048 (3 << INT_TIME_OFF)
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#define INT_CLK_4096 (4 << INT_TIME_OFF)
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#define INT_CLK_8192 (5 << INT_TIME_OFF)
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#define INT_CLK_16384 (6 << INT_TIME_OFF)
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#define INT_CLK_32768 (7 << INT_TIME_OFF)
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#define RST_EN (1 << 3)
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#define INT_EN (1 << 2)
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#define CLK_PCLK (1 << 1)
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#define WDT_EN (1 << 0)
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#define FLASH_BASE 0x80000000ULL
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#define SMU_RESET_VEC_LO_OFF 0x50
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#define SMU_RESET_VEC_HI_OFF 0x60
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#define SMU_HARTn_RESET_VEC_LO(n) (SMU_RESET_VEC_LO_OFF + (n * 0x4))
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#define SMU_HARTn_RESET_VEC_HI(n) (SMU_RESET_VEC_HI_OFF + (n * 0x4))
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static volatile char *wdt_addr;
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static volatile char *smu_addr;
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static int ae350_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_COLD_REBOOT:
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return 1;
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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default:
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return 0;
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}
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}
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static void ae350_system_reset(u32 type, u32 reason)
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{
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const struct sbi_platform *plat = sbi_platform_thishart_ptr();
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for (int i = 0; i < sbi_platform_hart_count(plat); i++) {
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writel(FLASH_BASE, smu_addr + SMU_HARTn_RESET_VEC_LO(i));
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writel(FLASH_BASE >> 32, smu_addr + SMU_HARTn_RESET_VEC_HI(i));
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}
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/* Program WDT control register */
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writew(ATCWDT200_WP_NUM, wdt_addr + WREN_REG);
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writel(INT_CLK_32768 | INT_EN | RST_CLK_128 | RST_EN | WDT_EN,
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wdt_addr + CTRL_REG);
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sbi_hart_hang();
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}
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static struct sbi_system_reset_device atcwdt200_reset = {
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.name = "atcwdt200",
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.system_reset_check = ae350_system_reset_check,
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.system_reset = ae350_system_reset,
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};
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static int atcwdt200_reset_init(void *fdt, int nodeoff,
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const struct fdt_match *match)
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{
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uint64_t reg_addr;
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int rc;
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rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, NULL);
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if (rc < 0 || !reg_addr)
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return SBI_ENODEV;
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wdt_addr = (volatile char *)(unsigned long)reg_addr;
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/*
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* The reset device requires smu to program the reset
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* vector for each hart.
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*/
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if (fdt_parse_compat_addr(fdt, ®_addr, "andestech,atcsmu"))
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return SBI_ENODEV;
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smu_addr = (volatile char *)(unsigned long)reg_addr;
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sbi_system_reset_add_device(&atcwdt200_reset);
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return 0;
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}
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static const struct fdt_match atcwdt200_reset_match[] = {
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{ .compatible = "andestech,atcwdt200" },
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{},
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};
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struct fdt_reset fdt_reset_atcwdt200 = {
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.match_table = atcwdt200_reset_match,
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.init = atcwdt200_reset_init,
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};
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