1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/sched.h>
13 
14 #include "omapdss.h"
15 #include "dss.h"
16 
17 struct dss_video_pll {
18 	struct dss_pll pll;
19 
20 	struct device *dev;
21 
22 	void __iomem *clkctrl_base;
23 };
24 
25 #define REG_MOD(reg, val, start, end) \
26 	writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg)
27 
28 static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll)
29 {
30 	REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */
31 }
32 
33 static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll)
34 {
35 	REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */
36 }
37 
38 static void dss_dpll_power_enable(struct dss_video_pll *vpll)
39 {
40 	REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */
41 
42 	/*
43 	 * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0,
44 	 * so we have to use fixed delay here.
45 	 */
46 	msleep(1);
47 }
48 
49 static void dss_dpll_power_disable(struct dss_video_pll *vpll)
50 {
51 	REG_MOD(vpll->clkctrl_base, 0, 31, 30);	/* PLL_POWER_OFF */
52 }
53 
54 static int dss_video_pll_enable(struct dss_pll *pll)
55 {
56 	struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
57 	int r;
58 
59 	r = dss_runtime_get(pll->dss);
60 	if (r)
61 		return r;
62 
63 	dss_ctrl_pll_enable(pll, true);
64 
65 	dss_dpll_enable_scp_clk(vpll);
66 
67 	r = dss_pll_wait_reset_done(pll);
68 	if (r)
69 		goto err_reset;
70 
71 	dss_dpll_power_enable(vpll);
72 
73 	return 0;
74 
75 err_reset:
76 	dss_dpll_disable_scp_clk(vpll);
77 	dss_ctrl_pll_enable(pll, false);
78 	dss_runtime_put(pll->dss);
79 
80 	return r;
81 }
82 
83 static void dss_video_pll_disable(struct dss_pll *pll)
84 {
85 	struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
86 
87 	dss_dpll_power_disable(vpll);
88 
89 	dss_dpll_disable_scp_clk(vpll);
90 
91 	dss_ctrl_pll_enable(pll, false);
92 
93 	dss_runtime_put(pll->dss);
94 }
95 
96 static const struct dss_pll_ops dss_pll_ops = {
97 	.enable = dss_video_pll_enable,
98 	.disable = dss_video_pll_disable,
99 	.set_config = dss_pll_write_config_type_a,
100 };
101 
102 static const struct dss_pll_hw dss_dra7_video_pll_hw = {
103 	.type = DSS_PLL_TYPE_A,
104 
105 	.n_max = (1 << 8) - 1,
106 	.m_max = (1 << 12) - 1,
107 	.mX_max = (1 << 5) - 1,
108 	.fint_min = 500000,
109 	.fint_max = 2500000,
110 	.clkdco_max = 1800000000,
111 
112 	.n_msb = 8,
113 	.n_lsb = 1,
114 	.m_msb = 20,
115 	.m_lsb = 9,
116 
117 	.mX_msb[0] = 25,
118 	.mX_lsb[0] = 21,
119 	.mX_msb[1] = 30,
120 	.mX_lsb[1] = 26,
121 	.mX_msb[2] = 4,
122 	.mX_lsb[2] = 0,
123 	.mX_msb[3] = 9,
124 	.mX_lsb[3] = 5,
125 
126 	.has_refsel = true,
127 
128 	.errata_i886 = true,
129 	.errata_i932 = true,
130 };
131 
132 struct dss_pll *dss_video_pll_init(struct dss_device *dss,
133 				   struct platform_device *pdev, int id,
134 				   struct regulator *regulator)
135 {
136 	const char * const reg_name[] = { "pll1", "pll2" };
137 	const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" };
138 	const char * const clkin_name[] = { "video1_clk", "video2_clk" };
139 
140 	struct dss_video_pll *vpll;
141 	void __iomem *pll_base, *clkctrl_base;
142 	struct clk *clk;
143 	struct dss_pll *pll;
144 	int r;
145 
146 	/* PLL CONTROL */
147 
148 	pll_base = devm_platform_ioremap_resource_byname(pdev, reg_name[id]);
149 	if (IS_ERR(pll_base))
150 		return ERR_CAST(pll_base);
151 
152 	/* CLOCK CONTROL */
153 
154 	clkctrl_base = devm_platform_ioremap_resource_byname(pdev, clkctrl_name[id]);
155 	if (IS_ERR(clkctrl_base))
156 		return ERR_CAST(clkctrl_base);
157 
158 	/* CLKIN */
159 
160 	clk = devm_clk_get(&pdev->dev, clkin_name[id]);
161 	if (IS_ERR(clk)) {
162 		DSSERR("can't get video pll clkin\n");
163 		return ERR_CAST(clk);
164 	}
165 
166 	vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL);
167 	if (!vpll)
168 		return ERR_PTR(-ENOMEM);
169 
170 	vpll->dev = &pdev->dev;
171 	vpll->clkctrl_base = clkctrl_base;
172 
173 	pll = &vpll->pll;
174 
175 	pll->name = id == 0 ? "video0" : "video1";
176 	pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2;
177 	pll->clkin = clk;
178 	pll->regulator = regulator;
179 	pll->base = pll_base;
180 	pll->hw = &dss_dra7_video_pll_hw;
181 	pll->ops = &dss_pll_ops;
182 
183 	r = dss_pll_register(dss, pll);
184 	if (r)
185 		return ERR_PTR(r);
186 
187 	return pll;
188 }
189 
190 void dss_video_pll_uninit(struct dss_pll *pll)
191 {
192 	dss_pll_unregister(pll);
193 }
194