1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018 BayLibre, SAS. 4 * Author: Neil Armstrong <narmstrong@baylibre.com> 5 */ 6 7 #include <linux/clk-provider.h> 8 #include <linux/module.h> 9 10 #include "clk-regmap.h" 11 #include "vid-pll-div.h" 12 13 static inline struct meson_vid_pll_div_data * 14 meson_vid_pll_div_data(struct clk_regmap *clk) 15 { 16 return (struct meson_vid_pll_div_data *)clk->data; 17 } 18 19 /* 20 * This vid_pll divided is a fully programmable fractionnal divider to 21 * achieve complex video clock rates. 22 * 23 * Here are provided the commonly used fraction values provided by Amlogic. 24 */ 25 26 struct vid_pll_div { 27 unsigned int shift_val; 28 unsigned int shift_sel; 29 unsigned int divider; 30 unsigned int multiplier; 31 }; 32 33 #define VID_PLL_DIV(_val, _sel, _ft, _fb) \ 34 { \ 35 .shift_val = (_val), \ 36 .shift_sel = (_sel), \ 37 .divider = (_ft), \ 38 .multiplier = (_fb), \ 39 } 40 41 static const struct vid_pll_div vid_pll_div_table[] = { 42 VID_PLL_DIV(0x0aaa, 0, 2, 1), /* 2/1 => /2 */ 43 VID_PLL_DIV(0x5294, 2, 5, 2), /* 5/2 => /2.5 */ 44 VID_PLL_DIV(0x0db6, 0, 3, 1), /* 3/1 => /3 */ 45 VID_PLL_DIV(0x36cc, 1, 7, 2), /* 7/2 => /3.5 */ 46 VID_PLL_DIV(0x6666, 2, 15, 4), /* 15/4 => /3.75 */ 47 VID_PLL_DIV(0x0ccc, 0, 4, 1), /* 4/1 => /4 */ 48 VID_PLL_DIV(0x739c, 2, 5, 1), /* 5/1 => /5 */ 49 VID_PLL_DIV(0x0e38, 0, 6, 1), /* 6/1 => /6 */ 50 VID_PLL_DIV(0x0000, 3, 25, 4), /* 25/4 => /6.25 */ 51 VID_PLL_DIV(0x3c78, 1, 7, 1), /* 7/1 => /7 */ 52 VID_PLL_DIV(0x78f0, 2, 15, 2), /* 15/2 => /7.5 */ 53 VID_PLL_DIV(0x0fc0, 0, 12, 1), /* 12/1 => /12 */ 54 VID_PLL_DIV(0x3f80, 1, 14, 1), /* 14/1 => /14 */ 55 VID_PLL_DIV(0x7f80, 2, 15, 1), /* 15/1 => /15 */ 56 }; 57 58 #define to_meson_vid_pll_div(_hw) \ 59 container_of(_hw, struct meson_vid_pll_div, hw) 60 61 static const struct vid_pll_div *_get_table_val(unsigned int shift_val, 62 unsigned int shift_sel) 63 { 64 int i; 65 66 for (i = 0 ; i < ARRAY_SIZE(vid_pll_div_table) ; ++i) { 67 if (vid_pll_div_table[i].shift_val == shift_val && 68 vid_pll_div_table[i].shift_sel == shift_sel) 69 return &vid_pll_div_table[i]; 70 } 71 72 return NULL; 73 } 74 75 static unsigned long meson_vid_pll_div_recalc_rate(struct clk_hw *hw, 76 unsigned long parent_rate) 77 { 78 struct clk_regmap *clk = to_clk_regmap(hw); 79 struct meson_vid_pll_div_data *pll_div = meson_vid_pll_div_data(clk); 80 const struct vid_pll_div *div; 81 82 div = _get_table_val(meson_parm_read(clk->map, &pll_div->val), 83 meson_parm_read(clk->map, &pll_div->sel)); 84 if (!div || !div->divider) { 85 pr_debug("%s: Invalid config value for vid_pll_div\n", __func__); 86 return 0; 87 } 88 89 return DIV_ROUND_UP_ULL(parent_rate * div->multiplier, div->divider); 90 } 91 92 const struct clk_ops meson_vid_pll_div_ro_ops = { 93 .recalc_rate = meson_vid_pll_div_recalc_rate, 94 }; 95 EXPORT_SYMBOL_GPL(meson_vid_pll_div_ro_ops); 96 97 MODULE_DESCRIPTION("Amlogic video pll divider driver"); 98 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); 99 MODULE_LICENSE("GPL v2"); 100