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/* Copyright (c) 2024 Silicon Laboratories Inc.
* SPDX-License-Identifier: Apache-2.0
*
* Poor man driver for 917 clocks. 917 includes High Performace (HP) clock
* (@46000000), Ultra Lower Power (ULP) clock (@24041400) and ULP VBAT (@24048000)
*
*/
#include <zephyr/dt-bindings/clock/silabs/siwx91x-clock.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/logging/log.h>
#include "rsi_power_save.h"
#include "rsi_rom_ulpss_clk.h"
#include "rsi_rom_clks.h"
#include "rsi_sysrtc.h"
#include "rsi_pll.h"
#include "rsi_adc.h"
#include "clock_update.h"
#include "sl_si91x_clock_manager.h"
#define DT_DRV_COMPAT silabs_siwx91x_clock
#define LF_FSM_CLOCK_FREQUENCY 32768
#define XTAL_FREQUENCY 40000000
LOG_MODULE_REGISTER(siwx91x_clock, CONFIG_CLOCK_CONTROL_LOG_LEVEL);
struct siwx91x_clock_data {
uint32_t enable;
};
static int siwx91x_clock_on(const struct device *dev, clock_control_subsys_t sys)
{
struct siwx91x_clock_data *data = dev->data;
uintptr_t clockid = (uintptr_t)sys;
switch (clockid) {
case SIWX91X_CLK_ULP_UART:
RSI_PS_UlpssPeriPowerUp(ULPSS_PWRGATE_ULP_UART);
RSI_ULPSS_UlpUartClkConfig(ULPCLK, ENABLE_STATIC_CLK,
false, ULP_UART_ULP_MHZ_RC_CLK, 1);
break;
case SIWX91X_CLK_ULP_I2C:
RSI_PS_UlpssPeriPowerUp(ULPSS_PWRGATE_ULP_I2C);
RSI_ULPSS_PeripheralEnable(ULPCLK, ULP_I2C_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_CLK_ULP_DMA:
RSI_PS_UlpssPeriPowerUp(ULPSS_PWRGATE_ULP_UDMA);
RSI_ULPSS_PeripheralEnable(ULPCLK, ULP_UDMA_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_CLK_UART0:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
/* RSI_CLK_UsartClkConfig() calls RSI_CLK_PeripheralClkEnable(); */
RSI_CLK_UsartClkConfig(M4CLK, ENABLE_STATIC_CLK, 0, USART1, 0, 1);
break;
case SIWX91X_CLK_UART1:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
/* RSI_CLK_UsartClkConfig() calls RSI_CLK_PeripheralClkEnable(); */
RSI_CLK_UsartClkConfig(M4CLK, ENABLE_STATIC_CLK, 0, USART2, 0, 1);
break;
case SIWX91X_CLK_I2C0:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
RSI_CLK_I2CClkConfig(M4CLK, true, 0);
break;
case SIWX91X_CLK_I2C1:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
RSI_CLK_I2CClkConfig(M4CLK, true, 1);
break;
case SIWX91X_CLK_DMA0:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
RSI_CLK_PeripheralClkEnable(M4CLK, UDMA_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_CLK_PWM:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
RSI_CLK_PeripheralClkEnable(M4CLK, PWM_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_CLK_WATCHDOG:
/* Both SYSRTC and WDT are clocked using LF-FSM XTAL which is initialized in
* SystemCoreClockUpdate(). This function allows clock to stabilize before use.
*/
rsi_sysrtc_clk_set(RSI_SYSRTC_CLK_32kHz_Xtal, 0);
break;
case SIWX91X_CLK_GSPI:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
RSI_CLK_GspiClkConfig(M4CLK, GSPI_INTF_PLL_CLK);
break;
case SIWX91X_CLK_QSPI:
RSI_CLK_Qspi2ClkConfig(M4CLK, QSPI_ULPREFCLK, 0, 0, 0);
break;
case SIWX91X_CLK_RTC:
/* Already done in sl_calendar_init()*/
RSI_PS_NpssPeriPowerUp(SLPSS_PWRGATE_ULP_MCURTC | SLPSS_PWRGATE_ULP_TIMEPERIOD);
break;
case SIWX91X_CLK_I2S0:
RSI_PS_M4ssPeriPowerUp(M4SS_PWRGATE_ULP_EFUSE_PERI);
break;
case SIWX91X_CLK_STATIC_I2S0:
MISC_CFG_MISC_CTRL1 |= (1 << 23);
RSI_CLK_PeripheralClkEnable(M4CLK, I2SM_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_CLK_ULP_I2S:
RSI_PS_UlpssPeriPowerUp(ULPSS_PWRGATE_ULP_I2S);
break;
case SIWX91X_CLK_STATIC_ULP_I2S:
ULPCLK->ULP_I2S_CLK_GEN_REG_b.ULP_I2S_MASTER_SLAVE_MODE_b = 1;
RSI_ULPSS_PeripheralEnable(ULPCLK, ULP_I2S_CLK, ENABLE_STATIC_CLK);
break;
case SIWX91X_ADC_CLK:
RSI_ADC_PowerControl(ADC_POWER_ON);
break;
default:
return -EINVAL;
}
data->enable |= BIT(clockid);
return 0;
}
static int siwx91x_clock_off(const struct device *dev, clock_control_subsys_t sys)
{
struct siwx91x_clock_data *data = dev->data;
uintptr_t clockid = (uintptr_t)sys;
switch (clockid) {
case SIWX91X_CLK_ULP_I2C:
RSI_ULPSS_PeripheralDisable(ULPCLK, ULP_I2C_CLK);
break;
case SIWX91X_CLK_ULP_DMA:
RSI_ULPSS_PeripheralDisable(ULPCLK, ULP_UDMA_CLK);
break;
case SIWX91X_CLK_UART0:
RSI_CLK_PeripheralClkDisable(M4CLK, USART1_CLK);
break;
case SIWX91X_CLK_UART1:
RSI_CLK_PeripheralClkDisable(M4CLK, USART2_CLK);
break;
case SIWX91X_CLK_DMA0:
RSI_CLK_PeripheralClkDisable(M4CLK, UDMA_CLK);
break;
case SIWX91X_CLK_STATIC_I2S0:
RSI_CLK_PeripheralClkDisable(M4CLK, I2SM_CLK);
break;
case SIWX91X_CLK_STATIC_ULP_I2S:
RSI_ULPSS_PeripheralDisable(ULPCLK, ULP_I2S_CLK);
break;
case SIWX91X_ADC_CLK:
RSI_ADC_PowerControl(ADC_POWER_OFF);
break;
case SIWX91X_CLK_ULP_UART:
case SIWX91X_CLK_I2C0:
case SIWX91X_CLK_I2C1:
/* Not supported */
return 0;
default:
return -EINVAL;
}
data->enable &= ~BIT(clockid);
return 0;
}
static int siwx91x_clock_get_rate(const struct device *dev, clock_control_subsys_t sys,
uint32_t *rate)
{
uintptr_t clockid = (uintptr_t)sys;
switch (clockid) {
case SIWX91X_CLK_ULP_UART:
*rate = RSI_CLK_GetBaseClock(ULPSS_UART);
return 0;
case SIWX91X_CLK_UART0:
*rate = RSI_CLK_GetBaseClock(M4_USART0);
return 0;
case SIWX91X_CLK_UART1:
*rate = RSI_CLK_GetBaseClock(M4_UART1);
return 0;
case SIWX91X_CLK_PWM:
/* PWM peripheral operates at the system clock frequency */
*rate = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC;
return 0;
case SIWX91X_CLK_WATCHDOG:
*rate = LF_FSM_CLOCK_FREQUENCY;
return 0;
case SIWX91X_CLK_GSPI:
*rate = RSI_CLK_GetBaseClock(M4_GSPI);
return 0;
default:
/* For now, no other driver need clock rate */
return -EINVAL;
}
}
static int siwx91x_clock_set_rate(const struct device *dev, clock_control_subsys_t sys,
clock_control_subsys_rate_t rate)
{
ARG_UNUSED(dev);
int div_numerator = FIELD_GET(0xFFFF0000, *(uint32_t *)rate);
int div_denominator = FIELD_GET(0x0000FFFF, *(uint32_t *)rate);
uintptr_t clockid = (uintptr_t)sys;
ULP_I2S_CLK_SELECT_T ref_clk;
uint32_t freq;
int ret;
switch (clockid) {
case SIWX91X_CLK_I2S0:
RSI_CLK_SetI2sPllFreq(M4CLK, *((uint32_t *)rate), XTAL_FREQUENCY);
RSI_CLK_I2sClkConfig(M4CLK, I2S_PLLCLK, 0);
return 0;
case SIWX91X_CLK_ULP_I2S:
ref_clk = ULPCLK->ULP_I2S_CLK_GEN_REG_b.ULP_I2S_CLK_SEL_b;
freq = RSI_CLK_GetBaseClock(ULPSS_I2S);
ret = RSI_ULPSS_UlpI2sClkConfig(ULPCLK, ref_clk, freq / (*((uint32_t *)rate) / 2));
if (ret) {
return -EIO;
}
return 0;
case SIWX91X_ADC_CLK:
RSI_ADC_ClkDivfactor(AUX_ADC_DAC_COMP, div_numerator, div_denominator);
return 0;
default:
/* For now, no other driver need clock rate */
return -EINVAL;
}
}
static enum clock_control_status siwx91x_clock_get_status(const struct device *dev,
clock_control_subsys_t sys)
{
struct siwx91x_clock_data *data = dev->data;
uintptr_t clockid = (uintptr_t)sys;
if (data->enable & BIT(clockid)) {
return CLOCK_CONTROL_STATUS_ON;
} else {
return CLOCK_CONTROL_STATUS_OFF;
}
}
static int siwx91x_clock_init(const struct device *dev)
{
SystemCoreClockUpdate();
sl_si91x_clock_manager_init();
/* Use SoC PLL at configured frequency as core clock */
sl_si91x_clock_manager_m4_set_core_clk(M4_SOCPLLCLK, CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);
/* Use interface PLL at configured frequency as peripheral clock */
sl_si91x_clock_manager_set_pll_freq(INFT_PLL, CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
PLL_REF_CLK_VAL_XTAL);
/* FIXME: Currently the clock consumer use clocks without power on them.
* This should be fixed in drivers. Meanwhile, get the list of required
* clocks using DT labels.
*/
#if DT_NODE_HAS_STATUS(DT_NODELABEL(ulpi2c), okay)
siwx91x_clock_on(dev, (clock_control_subsys_t)SIWX91X_CLK_ULP_I2C);
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c0), okay)
siwx91x_clock_on(dev, (clock_control_subsys_t)SIWX91X_CLK_I2C0);
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(i2c1), okay)
siwx91x_clock_on(dev, (clock_control_subsys_t)SIWX91X_CLK_I2C1);
#endif
return 0;
}
static DEVICE_API(clock_control, siwx91x_clock_api) = {
.on = siwx91x_clock_on,
.off = siwx91x_clock_off,
.get_rate = siwx91x_clock_get_rate,
.set_rate = siwx91x_clock_set_rate,
.get_status = siwx91x_clock_get_status,
};
#define SIWX91X_CLOCK_INIT(p) \
static struct siwx91x_clock_data siwx91x_clock_data_##p; \
DEVICE_DT_INST_DEFINE(p, siwx91x_clock_init, NULL, &siwx91x_clock_data_##p, NULL, \
PRE_KERNEL_1, CONFIG_CLOCK_CONTROL_INIT_PRIORITY, \
&siwx91x_clock_api);
DT_INST_FOREACH_STATUS_OKAY(SIWX91X_CLOCK_INIT)