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96 lines
2.1 KiB
96 lines
2.1 KiB
// 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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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_platdata(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_ofdata_to_platdata(struct udevice *dev) |
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{ |
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struct clk_boston *state = dev_get_platdata(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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.ofdata_to_platdata = clk_boston_ofdata_to_platdata, |
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.platdata_auto_alloc_size = sizeof(struct clk_boston), |
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.ops = &clk_boston_ops, |
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};
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