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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/fdt/fdt_fixup.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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