projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| dd7c7494 PB |
1 | /* |
| 2 | * Copyright (C) 2016 Imagination Technologies | |
| 3 | * | |
| 4 | * SPDX-License-Identifier: GPL-2.0 | |
| 5 | */ | |
| 6 | ||
| 7 | #include <common.h> | |
| 8 | #include <clk-uclass.h> | |
| 9 | #include <dm.h> | |
| 10 | #include <dt-bindings/clock/boston-clock.h> | |
| 11 | #include <regmap.h> | |
| 12 | #include <syscon.h> | |
| 13 | ||
| 14 | struct clk_boston { | |
| 15 | struct regmap *regmap; | |
| 16 | }; | |
| 17 | ||
| 18 | #define BOSTON_PLAT_MMCMDIV 0x30 | |
| 19 | # define BOSTON_PLAT_MMCMDIV_CLK0DIV (0xff << 0) | |
| 20 | # define BOSTON_PLAT_MMCMDIV_INPUT (0xff << 8) | |
| 21 | # define BOSTON_PLAT_MMCMDIV_MUL (0xff << 16) | |
| 22 | # define BOSTON_PLAT_MMCMDIV_CLK1DIV (0xff << 24) | |
| 23 | ||
| 24 | static uint32_t ext_field(uint32_t val, uint32_t mask) | |
| 25 | { | |
| 26 | return (val & mask) >> (ffs(mask) - 1); | |
| 27 | } | |
| 28 | ||
| 29 | static ulong clk_boston_get_rate(struct clk *clk) | |
| 30 | { | |
| 31 | struct clk_boston *state = dev_get_platdata(clk->dev); | |
| 32 | uint32_t in_rate, mul, div; | |
| 33 | uint mmcmdiv; | |
| 34 | int err; | |
| 35 | ||
| 36 | err = regmap_read(state->regmap, BOSTON_PLAT_MMCMDIV, &mmcmdiv); | |
| 37 | if (err) | |
| 38 | return 0; | |
| 39 | ||
| 40 | in_rate = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_INPUT); | |
| 41 | mul = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_MUL); | |
| 42 | ||
| 43 | switch (clk->id) { | |
| 44 | case BOSTON_CLK_SYS: | |
| 45 | div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK0DIV); | |
| 46 | break; | |
| 47 | case BOSTON_CLK_CPU: | |
| 48 | div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV); | |
| 49 | break; | |
| 50 | default: | |
| 51 | return 0; | |
| 52 | } | |
| 53 | ||
| 54 | return (in_rate * mul * 1000000) / div; | |
| 55 | } | |
| 56 | ||
| 57 | const struct clk_ops clk_boston_ops = { | |
| 58 | .get_rate = clk_boston_get_rate, | |
| 59 | }; | |
| 60 | ||
| 61 | static int clk_boston_ofdata_to_platdata(struct udevice *dev) | |
| 62 | { | |
| 63 | struct clk_boston *state = dev_get_platdata(dev); | |
| 64 | struct udevice *syscon; | |
| 65 | int err; | |
| 66 | ||
| 67 | err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, | |
| 68 | "regmap", &syscon); | |
| 69 | if (err) { | |
| 9b643e31 | 70 | pr_err("unable to find syscon device\n"); |
| dd7c7494 PB |
71 | return err; |
| 72 | } | |
| 73 | ||
| 74 | state->regmap = syscon_get_regmap(syscon); | |
| 75 | if (!state->regmap) { | |
| 9b643e31 | 76 | pr_err("unable to find regmap\n"); |
| dd7c7494 PB |
77 | return -ENODEV; |
| 78 | } | |
| 79 | ||
| 80 | return 0; | |
| 81 | } | |
| 82 | ||
| 83 | static const struct udevice_id clk_boston_match[] = { | |
| 84 | { | |
| 85 | .compatible = "img,boston-clock", | |
| 86 | }, | |
| 87 | { /* sentinel */ } | |
| 88 | }; | |
| 89 | ||
| 90 | U_BOOT_DRIVER(clk_boston) = { | |
| 91 | .name = "boston_clock", | |
| 92 | .id = UCLASS_CLK, | |
| 93 | .of_match = clk_boston_match, | |
| 94 | .ofdata_to_platdata = clk_boston_ofdata_to_platdata, | |
| 95 | .platdata_auto_alloc_size = sizeof(struct clk_boston), | |
| 96 | .ops = &clk_boston_ops, | |
| 97 | }; |