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89 lines
2.0 KiB
89 lines
2.0 KiB
/* |
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* Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#define DT_DRV_COMPAT microchip_sama7g5_sckc |
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#include <soc.h> |
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#include <zephyr/arch/cpu.h> |
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#include <zephyr/device.h> |
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#include <zephyr/devicetree.h> |
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#include <zephyr/drivers/clock_control.h> |
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#include <zephyr/drivers/clock_control/mchp_sam_pmc.h> |
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#include <zephyr/logging/log.h> |
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LOG_MODULE_REGISTER(sckc, CONFIG_CLOCK_CONTROL_LOG_LEVEL); |
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#define SAM_DT_SLOW_XTAL DEVICE_DT_GET(DT_NODELABEL(slow_xtal)) |
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static sckc_registers_t * const sckc_reg = |
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(sckc_registers_t *)DT_REG_ADDR(DT_NODELABEL(clk32k)); |
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static int sckc_on(const struct device *dev, clock_control_subsys_t sys) |
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{ |
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ARG_UNUSED(dev); |
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uint32_t reg = sckc_reg->SCKC_CR & ~SCKC_CR_Msk; |
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const struct sam_sckc_config *cfg = sys; |
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if (cfg == NULL) { |
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LOG_ERR("The SCKC config can not be NULL."); |
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return -ENXIO; |
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} |
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LOG_DBG("%s Oscillator", cfg->crystal_osc ? "Crystal" : "RC"); |
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if (cfg->crystal_osc) { |
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reg |= SCKC_CR_TD_OSCSEL(SCKC_CR_TD_OSCSEL_XTAL_Val); |
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} else { |
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reg |= SCKC_CR_TD_OSCSEL(SCKC_CR_TD_OSCSEL_RC_Val); |
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} |
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sckc_reg->SCKC_CR = reg; |
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return 0; |
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} |
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static int sckc_get_rate(const struct device *dev, |
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clock_control_subsys_t sys, |
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uint32_t *rate) |
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{ |
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ARG_UNUSED(dev); |
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ARG_UNUSED(sys); |
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bool sel_xtal = (sckc_reg->SCKC_CR & SCKC_CR_TD_OSCSEL_Msk) == |
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SCKC_CR_TD_OSCSEL(SCKC_CR_TD_OSCSEL_XTAL_Val); |
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int ret = 0; |
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LOG_DBG("%s Oscillator", sel_xtal ? "Crystal" : "RC"); |
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if (sel_xtal) { |
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ret = clock_control_get_rate(SAM_DT_SLOW_XTAL, NULL, rate); |
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} else { |
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*rate = KHZ(64); |
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} |
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LOG_DBG("Rate: %d", *rate); |
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return ret; |
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} |
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static enum clock_control_status sckc_get_status(const struct device *dev, |
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clock_control_subsys_t sys) |
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{ |
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ARG_UNUSED(dev); |
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ARG_UNUSED(sys); |
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return CLOCK_CONTROL_STATUS_ON; |
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} |
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static DEVICE_API(clock_control, sckc_api) = { |
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.on = sckc_on, |
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.get_rate = sckc_get_rate, |
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.get_status = sckc_get_status, |
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}; |
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DEVICE_DT_INST_DEFINE(0, NULL, NULL, NULL, NULL, PRE_KERNEL_1, |
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CONFIG_CLOCK_CONTROL_INIT_PRIORITY, |
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&sckc_api);
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