blob: f1f99cc762bdc9a09c9d9d225890020382164d9e [file] [log] [blame]
/*
* Copyright (c) 2022 ASPEED Technology Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT aspeed_ast10x0_clock
#include <errno.h>
#include <zephyr/dt-bindings/clock/ast10x0_clock.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/syscon.h>
#include <zephyr/sys/util.h>
#define LOG_LEVEL CONFIG_CLOCK_CONTROL_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(clock_control_ast10x0);
#define HPLL_FREQ MHZ(1000)
/*
* CLK_STOP_CTRL0/1_SET registers:
* - Each bit in these registers controls a clock gate
* - Write '1' to a bit: turn OFF the corresponding clock
* - Write '0' to a bit: no effect
* CLK_STOP_CTRL0/1_CLEAR register:
* - Write '1' to a bit: clear the corresponding bit in CLK_STOP_CTRL0/1.
* (turn ON the corresponding clock)
*/
#define CLK_STOP_CTRL0_SET 0x80
#define CLK_STOP_CTRL0_CLEAR 0x84
#define CLK_STOP_CTRL1_SET 0x90
#define CLK_STOP_CTRL1_CLEAR 0x94
#define CLK_SELECTION_REG4 0x310
#define I3C_CLK_SRC_SEL BIT(31)
#define I3C_CLK_SRC_HPLL 0
#define I3C_CLK_SRC_480M 1
#define I3C_CLK_DIV_SEL GENMASK(30, 28)
#define I3C_CLK_DIV_REG_TO_VAL(x) ((x == 0) ? 2 : (x + 1))
#define PCLK_DIV_SEL GENMASK(11, 8)
#define PCLK_DIV_REG_TO_VAL(x) ((x + 1) << 1)
#define CLK_SELECTION_REG5 0x314
#define HCLK_DIV_SEL GENMASK(30, 28)
#define HCLK_DIV_REG_TO_VAL(x) ((x == 0) ? 2 : x + 1)
struct clock_aspeed_config {
const struct device *syscon;
};
#define DEV_CFG(dev) ((const struct clock_aspeed_config *const)(dev)->config)
static int aspeed_clock_control_on(const struct device *dev, clock_control_subsys_t sub_system)
{
const struct device *syscon = DEV_CFG(dev)->syscon;
uint32_t clk_gate = (uint32_t)sub_system;
uint32_t addr = CLK_STOP_CTRL0_CLEAR;
/* there is no on/off control for group2 clocks */
if (clk_gate >= ASPEED_CLK_GRP_2_OFFSET) {
return 0;
}
if (clk_gate >= ASPEED_CLK_GRP_1_OFFSET) {
clk_gate -= ASPEED_CLK_GRP_1_OFFSET;
addr = CLK_STOP_CTRL1_CLEAR;
}
syscon_write_reg(syscon, addr, BIT(clk_gate));
return 0;
}
static int aspeed_clock_control_off(const struct device *dev, clock_control_subsys_t sub_system)
{
const struct device *syscon = DEV_CFG(dev)->syscon;
uint32_t clk_gate = (uint32_t)sub_system;
uint32_t addr = CLK_STOP_CTRL0_SET;
/* there is no on/off control for group2 clocks */
if (clk_gate >= ASPEED_CLK_GRP_2_OFFSET) {
return 0;
}
if (clk_gate >= ASPEED_CLK_GRP_1_OFFSET) {
clk_gate -= ASPEED_CLK_GRP_1_OFFSET;
addr = CLK_STOP_CTRL1_SET;
}
syscon_write_reg(syscon, addr, BIT(clk_gate));
return 0;
}
static int aspeed_clock_control_get_rate(const struct device *dev,
clock_control_subsys_t sub_system, uint32_t *rate)
{
const struct device *syscon = DEV_CFG(dev)->syscon;
uint32_t clk_id = (uint32_t)sub_system;
uint32_t reg, src, clk_div;
switch (clk_id) {
case ASPEED_CLK_I3C0:
case ASPEED_CLK_I3C1:
case ASPEED_CLK_I3C2:
case ASPEED_CLK_I3C3:
syscon_read_reg(syscon, CLK_SELECTION_REG4, &reg);
if (FIELD_GET(I3C_CLK_SRC_SEL, reg) == I3C_CLK_SRC_HPLL) {
src = HPLL_FREQ;
} else {
src = MHZ(480);
}
clk_div = I3C_CLK_DIV_REG_TO_VAL(FIELD_GET(I3C_CLK_DIV_SEL, reg));
*rate = src / clk_div;
break;
case ASPEED_CLK_HCLK:
src = HPLL_FREQ;
syscon_read_reg(syscon, CLK_SELECTION_REG5, &reg);
clk_div = HCLK_DIV_REG_TO_VAL(FIELD_GET(HCLK_DIV_SEL, reg));
*rate = src / clk_div;
break;
case ASPEED_CLK_PCLK:
src = HPLL_FREQ;
syscon_read_reg(syscon, CLK_SELECTION_REG4, &reg);
clk_div = PCLK_DIV_REG_TO_VAL(FIELD_GET(PCLK_DIV_SEL, reg));
*rate = src / clk_div;
break;
case ASPEED_CLK_UART1:
case ASPEED_CLK_UART2:
case ASPEED_CLK_UART3:
case ASPEED_CLK_UART4:
case ASPEED_CLK_UART5:
case ASPEED_CLK_UART6:
case ASPEED_CLK_UART7:
case ASPEED_CLK_UART8:
case ASPEED_CLK_UART9:
case ASPEED_CLK_UART10:
case ASPEED_CLK_UART11:
case ASPEED_CLK_UART12:
case ASPEED_CLK_UART13:
*rate = MHZ(24) / 13;
break;
default:
return -EINVAL;
}
return 0;
}
static const struct clock_control_driver_api aspeed_clk_api = {
.on = aspeed_clock_control_on,
.off = aspeed_clock_control_off,
.get_rate = aspeed_clock_control_get_rate,
};
#define ASPEED_CLOCK_INIT(n) \
static const struct clock_aspeed_config clock_aspeed_cfg_##n = { \
.syscon = DEVICE_DT_GET(DT_NODELABEL(syscon)), \
}; \
DEVICE_DT_INST_DEFINE(n, NULL, NULL, NULL, &clock_aspeed_cfg_##n, PRE_KERNEL_1, \
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &aspeed_clk_api);
DT_INST_FOREACH_STATUS_OKAY(ASPEED_CLOCK_INIT)