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- // SPDX-License-Identifier: BSD-2-Clause
- /*
- * Copyright (c) 2020 Western Digital Corporation or its affiliates.
- */
- #include <sbi/riscv_asm.h>
- #include <sbi/riscv_encoding.h>
- #include <sbi/riscv_io.h>
- #include <sbi/sbi_console.h>
- #include <sbi/sbi_const.h>
- #include <sbi/sbi_hart.h>
- #include <sbi/sbi_platform.h>
- #include <sbi_utils/fdt/fdt_helper.h>
- #include <sbi_utils/irqchip/plic.h>
- #include <sbi_utils/serial/uart8250.h>
- #include <sbi_utils/sys/clint.h>
- #define OPENPITON_UART_ADDR 0xfff0c2c000
- #define OPENPITON_UART_FREQ 60000000
- #define OPENPITON_UART_BAUDRATE 115200
- #define OPENPITON_UART_REG_SHIFT 0
- #define OPENPITON_UART_REG_WIDTH 1
- #define OPENPITON_PLIC_ADDR 0xfff1100000
- #define OPENPITON_PLIC_NUM_SOURCES 2
- #define OPENPITON_HART_COUNT 3
- #define OPENPITON_CLINT_ADDR 0xfff1020000
- #define SBI_OPENPITON_FEATURES \
- (SBI_PLATFORM_HAS_TIMER_VALUE | \
- SBI_PLATFORM_HAS_SCOUNTEREN | \
- SBI_PLATFORM_HAS_MCOUNTEREN | \
- SBI_PLATFORM_HAS_MFAULTS_DELEGATION)
- /*
- * OpenPiton platform early initialization.
- */
- static int openpiton_early_init(bool cold_boot)
- {
- /* For now nothing to do. */
- return 0;
- }
- /*
- * OpenPiton platform final initialization.
- */
- static int openpiton_final_init(bool cold_boot)
- {
- void *fdt;
- if (!cold_boot)
- return 0;
- fdt = sbi_scratch_thishart_arg1_ptr();
- fdt_fixups(fdt);
- return 0;
- }
- /*
- * Initialize the openpiton console.
- */
- static int openpiton_console_init(void)
- {
- return uart8250_init(OPENPITON_UART_ADDR,
- OPENPITON_UART_FREQ,
- OPENPITON_UART_BAUDRATE,
- OPENPITON_UART_REG_SHIFT,
- OPENPITON_UART_REG_WIDTH);
- }
- static int plic_openpiton_warm_irqchip_init(u32 target_hart,
- int m_cntx_id, int s_cntx_id)
- {
- size_t i, ie_words = OPENPITON_PLIC_NUM_SOURCES / 32 + 1;
- if (target_hart >= OPENPITON_HART_COUNT)
- return -1;
- /* By default, enable all IRQs for M-mode of target HART */
- if (m_cntx_id > -1) {
- for (i = 0; i < ie_words; i++)
- plic_set_ie(m_cntx_id, i, 1);
- }
- /* Enable all IRQs for S-mode of target HART */
- if (s_cntx_id > -1) {
- for (i = 0; i < ie_words; i++)
- plic_set_ie(s_cntx_id, i, 1);
- }
- /* By default, enable M-mode threshold */
- if (m_cntx_id > -1)
- plic_set_thresh(m_cntx_id, 1);
- /* By default, disable S-mode threshold */
- if (s_cntx_id > -1)
- plic_set_thresh(s_cntx_id, 0);
- return 0;
- }
- /*
- * Initialize the openpiton interrupt controller for current HART.
- */
- static int openpiton_irqchip_init(bool cold_boot)
- {
- u32 hartid = current_hartid();
- int ret;
- if (cold_boot) {
- ret = plic_cold_irqchip_init(OPENPITON_PLIC_ADDR,
- OPENPITON_PLIC_NUM_SOURCES,
- OPENPITON_HART_COUNT);
- if (ret)
- return ret;
- }
- return plic_openpiton_warm_irqchip_init(hartid,
- 2 * hartid, 2 * hartid + 1);
- }
- /*
- * Initialize IPI for current HART.
- */
- static int openpiton_ipi_init(bool cold_boot)
- {
- int ret;
- if (cold_boot) {
- ret = clint_cold_ipi_init(OPENPITON_CLINT_ADDR,
- OPENPITON_HART_COUNT);
- if (ret)
- return ret;
- }
- return clint_warm_ipi_init();
- }
- /*
- * Initialize openpiton timer for current HART.
- */
- static int openpiton_timer_init(bool cold_boot)
- {
- int ret;
- if (cold_boot) {
- ret = clint_cold_timer_init(OPENPITON_CLINT_ADDR,
- OPENPITON_HART_COUNT, TRUE);
- if (ret)
- return ret;
- }
- return clint_warm_timer_init();
- }
- /*
- * Reboot the openpiton.
- */
- static int openpiton_system_reboot(u32 type)
- {
- /* For now nothing to do. */
- sbi_printf("System reboot\n");
- return 0;
- }
- /*
- * Shutdown or poweroff the openpiton.
- */
- static int openpiton_system_shutdown(u32 type)
- {
- /* For now nothing to do. */
- sbi_printf("System shutdown\n");
- return 0;
- }
- /*
- * Platform descriptor.
- */
- const struct sbi_platform_operations platform_ops = {
- .early_init = openpiton_early_init,
- .final_init = openpiton_final_init,
- .console_init = openpiton_console_init,
- .console_putc = uart8250_putc,
- .console_getc = uart8250_getc,
- .irqchip_init = openpiton_irqchip_init,
- .ipi_init = openpiton_ipi_init,
- .ipi_send = clint_ipi_send,
- .ipi_clear = clint_ipi_clear,
- .timer_init = openpiton_timer_init,
- .timer_value = clint_timer_value,
- .timer_event_start = clint_timer_event_start,
- .timer_event_stop = clint_timer_event_stop,
- .system_reboot = openpiton_system_reboot,
- .system_shutdown = openpiton_system_shutdown
- };
- const struct sbi_platform platform = {
- .opensbi_version = OPENSBI_VERSION,
- .platform_version = SBI_PLATFORM_VERSION(0x0, 0x01),
- .name = "OPENPITON RISC-V",
- .features = SBI_OPENPITON_FEATURES,
- .hart_count = OPENPITON_HART_COUNT,
- .hart_stack_size = SBI_PLATFORM_DEFAULT_HART_STACK_SIZE,
- .platform_ops_addr = (unsigned long)&platform_ops
- };
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