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32 lines
758 B
32 lines
758 B
/* |
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* Copyright (c) 2019 Antmicro <www.antmicro.com> |
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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 litex_dna0 |
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#include <zephyr/drivers/hwinfo.h> |
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#include <soc.h> |
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#include <string.h> |
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#include <zephyr/device.h> |
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#include <zephyr/sys/util.h> |
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ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length) |
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{ |
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uint32_t addr = DT_INST_REG_ADDR(0); |
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ssize_t end = MIN(length, DT_INST_REG_SIZE(0) / 4 * |
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CONFIG_LITEX_CSR_DATA_WIDTH / 8); |
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for (int i = 0; i < end; i++) { |
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#if CONFIG_LITEX_CSR_DATA_WIDTH == 8 |
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buffer[i] = litex_read8(addr); |
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addr += 4; |
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#elif CONFIG_LITEX_CSR_DATA_WIDTH == 32 |
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buffer[i] = (uint8_t)(litex_read32(addr) >> (addr % 4 * 8)); |
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addr += 1; |
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#else |
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#error Unsupported CSR data width |
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#endif |
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} |
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return end; |
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}
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