1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7 #include <linux/clk.h>
8 #include <linux/clk-provider.h>
9
10 #include "mdp4_kms.h"
11
12 struct mdp4_lvds_pll {
13 struct clk_hw pll_hw;
14 struct drm_device *dev;
15 unsigned long pixclk;
16 };
17 #define to_mdp4_lvds_pll(x) container_of(x, struct mdp4_lvds_pll, pll_hw)
18
get_kms(struct mdp4_lvds_pll * lvds_pll)19 static struct mdp4_kms *get_kms(struct mdp4_lvds_pll *lvds_pll)
20 {
21 struct msm_drm_private *priv = lvds_pll->dev->dev_private;
22 return to_mdp4_kms(to_mdp_kms(priv->kms));
23 }
24
25 struct pll_rate {
26 unsigned long rate;
27 struct {
28 uint32_t val;
29 uint32_t reg;
30 } conf[32];
31 };
32
33 /* NOTE: keep sorted highest freq to lowest: */
34 static const struct pll_rate freqtbl[] = {
35 { 72000000, {
36 { 0x8f, REG_MDP4_LVDS_PHY_PLL_CTRL_1 },
37 { 0x30, REG_MDP4_LVDS_PHY_PLL_CTRL_2 },
38 { 0xc6, REG_MDP4_LVDS_PHY_PLL_CTRL_3 },
39 { 0x10, REG_MDP4_LVDS_PHY_PLL_CTRL_5 },
40 { 0x07, REG_MDP4_LVDS_PHY_PLL_CTRL_6 },
41 { 0x62, REG_MDP4_LVDS_PHY_PLL_CTRL_7 },
42 { 0x41, REG_MDP4_LVDS_PHY_PLL_CTRL_8 },
43 { 0x0d, REG_MDP4_LVDS_PHY_PLL_CTRL_9 },
44 { 0, 0 } }
45 },
46 };
47
find_rate(unsigned long rate)48 static const struct pll_rate *find_rate(unsigned long rate)
49 {
50 int i;
51 for (i = 1; i < ARRAY_SIZE(freqtbl); i++)
52 if (rate > freqtbl[i].rate)
53 return &freqtbl[i-1];
54 return &freqtbl[i-1];
55 }
56
mpd4_lvds_pll_enable(struct clk_hw * hw)57 static int mpd4_lvds_pll_enable(struct clk_hw *hw)
58 {
59 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
60 struct mdp4_kms *mdp4_kms = get_kms(lvds_pll);
61 const struct pll_rate *pll_rate = find_rate(lvds_pll->pixclk);
62 int i;
63
64 DBG("pixclk=%lu (%lu)", lvds_pll->pixclk, pll_rate->rate);
65
66 if (WARN_ON(!pll_rate))
67 return -EINVAL;
68
69 mdp4_write(mdp4_kms, REG_MDP4_LCDC_LVDS_PHY_RESET, 0x33);
70
71 for (i = 0; pll_rate->conf[i].reg; i++)
72 mdp4_write(mdp4_kms, pll_rate->conf[i].reg, pll_rate->conf[i].val);
73
74 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x01);
75
76 /* Wait until LVDS PLL is locked and ready */
77 while (!mdp4_read(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_LOCKED))
78 cpu_relax();
79
80 return 0;
81 }
82
mpd4_lvds_pll_disable(struct clk_hw * hw)83 static void mpd4_lvds_pll_disable(struct clk_hw *hw)
84 {
85 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
86 struct mdp4_kms *mdp4_kms = get_kms(lvds_pll);
87
88 DBG("");
89
90 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_CFG0, 0x0);
91 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x0);
92 }
93
mpd4_lvds_pll_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)94 static unsigned long mpd4_lvds_pll_recalc_rate(struct clk_hw *hw,
95 unsigned long parent_rate)
96 {
97 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
98 return lvds_pll->pixclk;
99 }
100
mpd4_lvds_pll_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)101 static long mpd4_lvds_pll_round_rate(struct clk_hw *hw, unsigned long rate,
102 unsigned long *parent_rate)
103 {
104 const struct pll_rate *pll_rate = find_rate(rate);
105 return pll_rate->rate;
106 }
107
mpd4_lvds_pll_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)108 static int mpd4_lvds_pll_set_rate(struct clk_hw *hw, unsigned long rate,
109 unsigned long parent_rate)
110 {
111 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw);
112 lvds_pll->pixclk = rate;
113 return 0;
114 }
115
116
117 static const struct clk_ops mpd4_lvds_pll_ops = {
118 .enable = mpd4_lvds_pll_enable,
119 .disable = mpd4_lvds_pll_disable,
120 .recalc_rate = mpd4_lvds_pll_recalc_rate,
121 .round_rate = mpd4_lvds_pll_round_rate,
122 .set_rate = mpd4_lvds_pll_set_rate,
123 };
124
125 static const char *mpd4_lvds_pll_parents[] = {
126 "pxo",
127 };
128
129 static struct clk_init_data pll_init = {
130 .name = "mpd4_lvds_pll",
131 .ops = &mpd4_lvds_pll_ops,
132 .parent_names = mpd4_lvds_pll_parents,
133 .num_parents = ARRAY_SIZE(mpd4_lvds_pll_parents),
134 };
135
mpd4_lvds_pll_init(struct drm_device * dev)136 struct clk *mpd4_lvds_pll_init(struct drm_device *dev)
137 {
138 struct mdp4_lvds_pll *lvds_pll;
139 struct clk *clk;
140 int ret;
141
142 lvds_pll = devm_kzalloc(dev->dev, sizeof(*lvds_pll), GFP_KERNEL);
143 if (!lvds_pll) {
144 ret = -ENOMEM;
145 goto fail;
146 }
147
148 lvds_pll->dev = dev;
149
150 lvds_pll->pll_hw.init = &pll_init;
151 clk = devm_clk_register(dev->dev, &lvds_pll->pll_hw);
152 if (IS_ERR(clk)) {
153 ret = PTR_ERR(clk);
154 goto fail;
155 }
156
157 return clk;
158
159 fail:
160 return ERR_PTR(ret);
161 }
162