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fd426b3106
"kendryte" is the marketing name for the K210 RISC-V SoC produced by Canaan Inc. Rather than "kendryte,k210", use the usual "canaan,k210" vendor,SoC compatibility string format in the device tree files and use the SoC name for file names. With these changes, the device tree files are more in sync with the Linux kernel DTS and drivers, making uboot device tree usable by the kernel. Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
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*/
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#include <common.h>
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/* For DIV_ROUND_DOWN_ULL, defined in linux/kernel.h */
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#include <div64.h>
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#include <dm/test.h>
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#include <k210/pll.h>
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#include <test/ut.h>
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static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in,
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struct k210_pll_config *best)
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{
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u64 f, r, od, max_r, inv_ratio;
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s64 error, best_error;
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best_error = S64_MAX;
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error = best_error;
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max_r = min(16ULL, DIV_ROUND_DOWN_ULL(rate_in, 13300000));
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inv_ratio = DIV_ROUND_CLOSEST_ULL((u64)rate_in << 32, rate);
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/* Brute force it */
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for (r = 1; r <= max_r; r++) {
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for (f = 1; f <= 64; f++) {
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for (od = 1; od <= 16; od++) {
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u64 vco = DIV_ROUND_CLOSEST_ULL(rate_in * f, r);
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if (vco > 1750000000 || vco < 340000000)
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continue;
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error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio,
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r * od);
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/* The lower 16 bits are spurious */
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error = abs((error - BIT(32))) >> 16;
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if (error < best_error) {
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best->r = r;
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best->f = f;
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best->od = od;
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best_error = error;
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}
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}
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}
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}
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if (best_error == S64_MAX)
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return -EINVAL;
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return 0;
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}
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static int dm_test_k210_pll_compare(struct k210_pll_config *ours,
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struct k210_pll_config *theirs)
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{
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return (u32)ours->f * theirs->r * theirs->od !=
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(u32)theirs->f * ours->r * ours->od;
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}
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static int dm_test_k210_pll(struct unit_test_state *uts)
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{
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struct k210_pll_config ours, theirs;
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/* General range checks */
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ut_asserteq(-EINVAL, k210_pll_calc_config(0, 26000000, &theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(390000000, 0, &theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(2000000000, 26000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(390000000, 2000000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(1500000000, 20000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(1750000000, 13300000,
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&theirs));
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/* Verify we get the same output with brute-force */
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#define compare(rate, rate_in) do { \
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ut_assertok(dm_test_k210_pll_calc_config(rate, rate_in, &ours)); \
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ut_assertok(k210_pll_calc_config(rate, rate_in, &theirs)); \
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ut_assertok(dm_test_k210_pll_compare(&ours, &theirs)); \
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} while (0)
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compare(390000000, 26000000);
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compare(26000000, 390000000);
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compare(400000000, 26000000);
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compare(27000000, 26000000);
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compare(26000000, 27000000);
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compare(13300000 * 64, 13300000);
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compare(21250000, 21250000 * 70);
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compare(21250000, 1750000000);
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compare(1750000000, 1750000000);
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return 0;
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}
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DM_TEST(dm_test_k210_pll, 0);
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