Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * Copyright (C) 2019 DENX Software Engineering |
| 4 | * Lukasz Majewski, DENX Software Engineering, lukma@denx.de |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <asm/io.h> |
| 9 | #include <malloc.h> |
| 10 | #include <clk-uclass.h> |
| 11 | #include <dm/device.h> |
| 12 | #include <dm/uclass.h> |
| 13 | #include <clk.h> |
| 14 | #include "clk.h" |
| 15 | |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 16 | #define UBOOT_DM_CLK_IMX_PLLV3_GENERIC "imx_clk_pllv3_generic" |
| 17 | #define UBOOT_DM_CLK_IMX_PLLV3_USB "imx_clk_pllv3_usb" |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 18 | |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 19 | #define BM_PLL_POWER (0x1 << 12) |
Giulio Benetti | 9841fee | 2020-01-10 15:46:57 +0100 | [diff] [blame^] | 20 | #define BM_PLL_LOCK (0x1 << 31) |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 21 | |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 22 | struct clk_pllv3 { |
| 23 | struct clk clk; |
| 24 | void __iomem *base; |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 25 | u32 power_bit; |
| 26 | bool powerup_set; |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 27 | u32 div_mask; |
| 28 | u32 div_shift; |
| 29 | }; |
| 30 | |
| 31 | #define to_clk_pllv3(_clk) container_of(_clk, struct clk_pllv3, clk) |
| 32 | |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 33 | static ulong clk_pllv3_generic_get_rate(struct clk *clk) |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 34 | { |
| 35 | struct clk_pllv3 *pll = to_clk_pllv3(dev_get_clk_ptr(clk->dev)); |
| 36 | unsigned long parent_rate = clk_get_parent_rate(clk); |
| 37 | |
| 38 | u32 div = (readl(pll->base) >> pll->div_shift) & pll->div_mask; |
| 39 | |
| 40 | return (div == 1) ? parent_rate * 22 : parent_rate * 20; |
| 41 | } |
| 42 | |
Giulio Benetti | 9841fee | 2020-01-10 15:46:57 +0100 | [diff] [blame^] | 43 | static ulong clk_pllv3_generic_set_rate(struct clk *clk, ulong rate) |
| 44 | { |
| 45 | struct clk_pllv3 *pll = to_clk_pllv3(clk); |
| 46 | unsigned long parent_rate = clk_get_parent_rate(clk); |
| 47 | u32 val, div; |
| 48 | |
| 49 | if (rate == parent_rate * 22) |
| 50 | div = 1; |
| 51 | else if (rate == parent_rate * 20) |
| 52 | div = 0; |
| 53 | else |
| 54 | return -EINVAL; |
| 55 | |
| 56 | val = readl(pll->base); |
| 57 | val &= ~(pll->div_mask << pll->div_shift); |
| 58 | val |= (div << pll->div_shift); |
| 59 | writel(val, pll->base); |
| 60 | |
| 61 | /* Wait for PLL to lock */ |
| 62 | while (!(readl(pll->base) & BM_PLL_LOCK)) |
| 63 | ; |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 68 | static int clk_pllv3_generic_enable(struct clk *clk) |
| 69 | { |
| 70 | struct clk_pllv3 *pll = to_clk_pllv3(clk); |
| 71 | u32 val; |
| 72 | |
| 73 | val = readl(pll->base); |
| 74 | if (pll->powerup_set) |
| 75 | val |= pll->power_bit; |
| 76 | else |
| 77 | val &= ~pll->power_bit; |
| 78 | writel(val, pll->base); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
Giulio Benetti | cbb2001 | 2020-01-10 15:46:56 +0100 | [diff] [blame] | 83 | static int clk_pllv3_generic_disable(struct clk *clk) |
| 84 | { |
| 85 | struct clk_pllv3 *pll = to_clk_pllv3(clk); |
| 86 | u32 val; |
| 87 | |
| 88 | val = readl(pll->base); |
| 89 | if (pll->powerup_set) |
| 90 | val &= ~pll->power_bit; |
| 91 | else |
| 92 | val |= pll->power_bit; |
| 93 | writel(val, pll->base); |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 98 | static const struct clk_ops clk_pllv3_generic_ops = { |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 99 | .get_rate = clk_pllv3_generic_get_rate, |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 100 | .enable = clk_pllv3_generic_enable, |
Giulio Benetti | cbb2001 | 2020-01-10 15:46:56 +0100 | [diff] [blame] | 101 | .disable = clk_pllv3_generic_disable, |
Giulio Benetti | 9841fee | 2020-01-10 15:46:57 +0100 | [diff] [blame^] | 102 | .set_rate = clk_pllv3_generic_set_rate, |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 103 | }; |
| 104 | |
| 105 | struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name, |
| 106 | const char *parent_name, void __iomem *base, |
| 107 | u32 div_mask) |
| 108 | { |
| 109 | struct clk_pllv3 *pll; |
| 110 | struct clk *clk; |
| 111 | char *drv_name; |
| 112 | int ret; |
| 113 | |
| 114 | pll = kzalloc(sizeof(*pll), GFP_KERNEL); |
| 115 | if (!pll) |
| 116 | return ERR_PTR(-ENOMEM); |
| 117 | |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 118 | pll->power_bit = BM_PLL_POWER; |
| 119 | |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 120 | switch (type) { |
| 121 | case IMX_PLLV3_GENERIC: |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 122 | drv_name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC; |
Giulio Benetti | 4abd807 | 2020-01-10 15:46:54 +0100 | [diff] [blame] | 123 | pll->div_shift = 0; |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 124 | pll->powerup_set = false; |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 125 | break; |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 126 | case IMX_PLLV3_USB: |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 127 | drv_name = UBOOT_DM_CLK_IMX_PLLV3_USB; |
Giulio Benetti | 4abd807 | 2020-01-10 15:46:54 +0100 | [diff] [blame] | 128 | pll->div_shift = 1; |
Giulio Benetti | f4b7094 | 2020-01-10 15:46:55 +0100 | [diff] [blame] | 129 | pll->powerup_set = true; |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 130 | break; |
| 131 | default: |
| 132 | kfree(pll); |
| 133 | return ERR_PTR(-ENOTSUPP); |
| 134 | } |
| 135 | |
| 136 | pll->base = base; |
| 137 | pll->div_mask = div_mask; |
| 138 | clk = &pll->clk; |
| 139 | |
| 140 | ret = clk_register(clk, drv_name, name, parent_name); |
| 141 | if (ret) { |
| 142 | kfree(pll); |
| 143 | return ERR_PTR(ret); |
| 144 | } |
| 145 | |
| 146 | return clk; |
| 147 | } |
| 148 | |
| 149 | U_BOOT_DRIVER(clk_pllv3_generic) = { |
Giulio Benetti | 16faa59 | 2020-01-10 15:46:53 +0100 | [diff] [blame] | 150 | .name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC, |
| 151 | .id = UCLASS_CLK, |
| 152 | .ops = &clk_pllv3_generic_ops, |
| 153 | .flags = DM_FLAG_PRE_RELOC, |
| 154 | }; |
| 155 | |
| 156 | U_BOOT_DRIVER(clk_pllv3_usb) = { |
| 157 | .name = UBOOT_DM_CLK_IMX_PLLV3_USB, |
Lukasz Majewski | 1d7993d | 2019-06-24 15:50:45 +0200 | [diff] [blame] | 158 | .id = UCLASS_CLK, |
| 159 | .ops = &clk_pllv3_generic_ops, |
| 160 | .flags = DM_FLAG_PRE_RELOC, |
| 161 | }; |