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https://github.com/AsahiLinux/u-boot
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1e94b46f73
This old patch was marked as deferred. Bring it back to life, to continue towards the removal of common.h Move this out of the common header and include it only where needed. Signed-off-by: Simon Glass <sjg@chromium.org>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 Imagination Technologies
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*/
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#include <common.h>
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#include <clk-uclass.h>
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#include <dm.h>
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#include <dt-bindings/clock/boston-clock.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <linux/bitops.h>
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#include <linux/printk.h>
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struct clk_boston {
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struct regmap *regmap;
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};
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#define BOSTON_PLAT_MMCMDIV 0x30
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# define BOSTON_PLAT_MMCMDIV_CLK0DIV (0xff << 0)
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# define BOSTON_PLAT_MMCMDIV_INPUT (0xff << 8)
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# define BOSTON_PLAT_MMCMDIV_MUL (0xff << 16)
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# define BOSTON_PLAT_MMCMDIV_CLK1DIV (0xff << 24)
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static uint32_t ext_field(uint32_t val, uint32_t mask)
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{
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return (val & mask) >> (ffs(mask) - 1);
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}
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static ulong clk_boston_get_rate(struct clk *clk)
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{
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struct clk_boston *state = dev_get_plat(clk->dev);
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uint32_t in_rate, mul, div;
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uint mmcmdiv;
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int err;
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err = regmap_read(state->regmap, BOSTON_PLAT_MMCMDIV, &mmcmdiv);
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if (err)
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return 0;
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in_rate = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_INPUT);
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mul = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_MUL);
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switch (clk->id) {
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case BOSTON_CLK_SYS:
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div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK0DIV);
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break;
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case BOSTON_CLK_CPU:
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div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV);
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break;
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default:
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return 0;
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}
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return (in_rate * mul * 1000000) / div;
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}
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const struct clk_ops clk_boston_ops = {
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.get_rate = clk_boston_get_rate,
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};
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static int clk_boston_of_to_plat(struct udevice *dev)
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{
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struct clk_boston *state = dev_get_plat(dev);
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struct udevice *syscon;
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int err;
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err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
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"regmap", &syscon);
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if (err) {
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pr_err("unable to find syscon device\n");
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return err;
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}
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state->regmap = syscon_get_regmap(syscon);
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if (!state->regmap) {
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pr_err("unable to find regmap\n");
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return -ENODEV;
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}
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return 0;
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}
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static const struct udevice_id clk_boston_match[] = {
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{
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.compatible = "img,boston-clock",
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},
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(clk_boston) = {
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.name = "boston_clock",
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.id = UCLASS_CLK,
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.of_match = clk_boston_match,
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.of_to_plat = clk_boston_of_to_plat,
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.plat_auto = sizeof(struct clk_boston),
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.ops = &clk_boston_ops,
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};
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