Files
opensbi/platform/kendryte/k210/platform.c
Anup Patel a9a9751185 lib: utils: Allow CLINT functions to be used for multiple CLINTs
We extend CLINT cold init function to have a "struct clint_data *"
parameter pointing to CLINT details. This allows platforms to use
CLINT functions for multiple CLINT instances.

When multiple CLINTs are present, the platform can also provide
one of the CLINT as reference CLINT for other CLINTs. This will
help CLINTs to sync their time value with reference CLINT using
a time_delta computed in warm init function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:43 +05:30

143 lines
3.1 KiB
C

/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Damien Le Moal <damien.lemoal@wdc.com>
*/
#include <sbi/riscv_asm.h>
#include <sbi/riscv_encoding.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_const.h>
#include <sbi/sbi_platform.h>
#include <sbi_utils/irqchip/plic.h>
#include <sbi_utils/serial/sifive-uart.h>
#include <sbi_utils/sys/clint.h>
#include "platform.h"
static struct plic_data plic = {
.addr = K210_PLIC_BASE_ADDR,
.num_src = K210_PLIC_NUM_SOURCES,
};
static struct clint_data clint = {
.addr = K210_CLINT_BASE_ADDR,
.first_hartid = 0,
.hart_count = K210_HART_COUNT,
.has_64bit_mmio = TRUE,
};
static u32 k210_get_clk_freq(void)
{
u32 clksel0, pll0;
u64 pll0_freq, clkr0, clkf0, clkod0, div;
/*
* If the clock selector is not set, use the base frequency.
* Otherwise, use PLL0 frequency with a frequency divisor.
*/
clksel0 = k210_read_sysreg(K210_CLKSEL0);
if (!(clksel0 & 0x1))
return K210_CLK0_FREQ;
/*
* Get PLL0 frequency:
* freq = base frequency * clkf0 / (clkr0 * clkod0)
*/
pll0 = k210_read_sysreg(K210_PLL0);
clkr0 = 1 + (pll0 & 0x0000000f);
clkf0 = 1 + ((pll0 & 0x000003f0) >> 4);
clkod0 = 1 + ((pll0 & 0x00003c00) >> 10);
pll0_freq = clkf0 * K210_CLK0_FREQ / (clkr0 * clkod0);
/* Get the frequency divisor from the clock selector */
div = 2ULL << ((clksel0 & 0x00000006) >> 1);
return pll0_freq / div;
}
static int k210_console_init(void)
{
return sifive_uart_init(K210_UART_BASE_ADDR, k210_get_clk_freq(),
K210_UART_BAUDRATE);
}
static int k210_irqchip_init(bool cold_boot)
{
int rc;
u32 hartid = current_hartid();
if (cold_boot) {
rc = plic_cold_irqchip_init(&plic);
if (rc)
return rc;
}
return plic_warm_irqchip_init(&plic, hartid * 2, hartid * 2 + 1);
}
static int k210_ipi_init(bool cold_boot)
{
int rc;
if (cold_boot) {
rc = clint_cold_ipi_init(&clint);
if (rc)
return rc;
}
return clint_warm_ipi_init();
}
static int k210_timer_init(bool cold_boot)
{
int rc;
if (cold_boot) {
rc = clint_cold_timer_init(&clint, NULL);
if (rc)
return rc;
}
return clint_warm_timer_init();
}
static int k210_system_reset(u32 type)
{
/* For now nothing to do. */
sbi_printf("System reset\n");
return 0;
}
const struct sbi_platform_operations platform_ops = {
.console_init = k210_console_init,
.console_putc = sifive_uart_putc,
.console_getc = sifive_uart_getc,
.irqchip_init = k210_irqchip_init,
.ipi_init = k210_ipi_init,
.ipi_send = clint_ipi_send,
.ipi_clear = clint_ipi_clear,
.timer_init = k210_timer_init,
.timer_value = clint_timer_value,
.timer_event_stop = clint_timer_event_stop,
.timer_event_start = clint_timer_event_start,
.system_reset = k210_system_reset
};
const struct sbi_platform platform = {
.opensbi_version = OPENSBI_VERSION,
.platform_version = SBI_PLATFORM_VERSION(0x0, 0x01),
.name = "Kendryte K210",
.features = SBI_PLATFORM_HAS_TIMER_VALUE,
.hart_count = K210_HART_COUNT,
.hart_stack_size = SBI_PLATFORM_DEFAULT_HART_STACK_SIZE,
.platform_ops_addr = (unsigned long)&platform_ops
};