1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HDMI PLL
4  *
5  * Copyright (C) 2013 Texas Instruments Incorporated
6  */
7 
8 #define DSS_SUBSYS_NAME "HDMIPLL"
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/seq_file.h>
17 
18 #include <video/omapfb_dss.h>
19 
20 #include "dss.h"
21 #include "hdmi.h"
22 
hdmi_pll_dump(struct hdmi_pll_data * pll,struct seq_file * s)23 void hdmi_pll_dump(struct hdmi_pll_data *pll, struct seq_file *s)
24 {
25 #define DUMPPLL(r) seq_printf(s, "%-35s %08x\n", #r,\
26 		hdmi_read_reg(pll->base, r))
27 
28 	DUMPPLL(PLLCTRL_PLL_CONTROL);
29 	DUMPPLL(PLLCTRL_PLL_STATUS);
30 	DUMPPLL(PLLCTRL_PLL_GO);
31 	DUMPPLL(PLLCTRL_CFG1);
32 	DUMPPLL(PLLCTRL_CFG2);
33 	DUMPPLL(PLLCTRL_CFG3);
34 	DUMPPLL(PLLCTRL_SSC_CFG1);
35 	DUMPPLL(PLLCTRL_SSC_CFG2);
36 	DUMPPLL(PLLCTRL_CFG4);
37 }
38 
hdmi_pll_compute(struct hdmi_pll_data * pll,unsigned long target_tmds,struct dss_pll_clock_info * pi)39 void hdmi_pll_compute(struct hdmi_pll_data *pll,
40 	unsigned long target_tmds, struct dss_pll_clock_info *pi)
41 {
42 	unsigned long fint, clkdco, clkout;
43 	unsigned long target_bitclk, target_clkdco;
44 	unsigned long min_dco;
45 	unsigned n, m, mf, m2, sd;
46 	unsigned long clkin;
47 	const struct dss_pll_hw *hw = pll->pll.hw;
48 
49 	clkin = clk_get_rate(pll->pll.clkin);
50 
51 	DSSDBG("clkin %lu, target tmds %lu\n", clkin, target_tmds);
52 
53 	target_bitclk = target_tmds * 10;
54 
55 	/* Fint */
56 	n = DIV_ROUND_UP(clkin, hw->fint_max);
57 	fint = clkin / n;
58 
59 	/* adjust m2 so that the clkdco will be high enough */
60 	min_dco = roundup(hw->clkdco_min, fint);
61 	m2 = DIV_ROUND_UP(min_dco, target_bitclk);
62 	if (m2 == 0)
63 		m2 = 1;
64 
65 	target_clkdco = target_bitclk * m2;
66 	m = target_clkdco / fint;
67 
68 	clkdco = fint * m;
69 
70 	/* adjust clkdco with fractional mf */
71 	if (WARN_ON(target_clkdco - clkdco > fint))
72 		mf = 0;
73 	else
74 		mf = (u32)div_u64(262144ull * (target_clkdco - clkdco), fint);
75 
76 	if (mf > 0)
77 		clkdco += (u32)div_u64((u64)mf * fint, 262144);
78 
79 	clkout = clkdco / m2;
80 
81 	/* sigma-delta */
82 	sd = DIV_ROUND_UP(fint * m, 250000000);
83 
84 	DSSDBG("N = %u, M = %u, M.f = %u, M2 = %u, SD = %u\n",
85 		n, m, mf, m2, sd);
86 	DSSDBG("Fint %lu, clkdco %lu, clkout %lu\n", fint, clkdco, clkout);
87 
88 	pi->n = n;
89 	pi->m = m;
90 	pi->mf = mf;
91 	pi->mX[0] = m2;
92 	pi->sd = sd;
93 
94 	pi->fint = fint;
95 	pi->clkdco = clkdco;
96 	pi->clkout[0] = clkout;
97 }
98 
hdmi_pll_enable(struct dss_pll * dsspll)99 static int hdmi_pll_enable(struct dss_pll *dsspll)
100 {
101 	struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
102 	struct hdmi_wp_data *wp = pll->wp;
103 
104 	dss_ctrl_pll_enable(DSS_PLL_HDMI, true);
105 
106 	return hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_BOTHON_ALLCLKS);
107 }
108 
hdmi_pll_disable(struct dss_pll * dsspll)109 static void hdmi_pll_disable(struct dss_pll *dsspll)
110 {
111 	struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
112 	struct hdmi_wp_data *wp = pll->wp;
113 
114 	hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF);
115 
116 	dss_ctrl_pll_enable(DSS_PLL_HDMI, false);
117 }
118 
119 static const struct dss_pll_ops dsi_pll_ops = {
120 	.enable = hdmi_pll_enable,
121 	.disable = hdmi_pll_disable,
122 	.set_config = dss_pll_write_config_type_b,
123 };
124 
125 static const struct dss_pll_hw dss_omap4_hdmi_pll_hw = {
126 	.n_max = 255,
127 	.m_min = 20,
128 	.m_max = 4095,
129 	.mX_max = 127,
130 	.fint_min = 500000,
131 	.fint_max = 2500000,
132 
133 	.clkdco_min = 500000000,
134 	.clkdco_low = 1000000000,
135 	.clkdco_max = 2000000000,
136 
137 	.n_msb = 8,
138 	.n_lsb = 1,
139 	.m_msb = 20,
140 	.m_lsb = 9,
141 
142 	.mX_msb[0] = 24,
143 	.mX_lsb[0] = 18,
144 
145 	.has_selfreqdco = true,
146 };
147 
148 static const struct dss_pll_hw dss_omap5_hdmi_pll_hw = {
149 	.n_max = 255,
150 	.m_min = 20,
151 	.m_max = 2045,
152 	.mX_max = 127,
153 	.fint_min = 620000,
154 	.fint_max = 2500000,
155 
156 	.clkdco_min = 750000000,
157 	.clkdco_low = 1500000000,
158 	.clkdco_max = 2500000000UL,
159 
160 	.n_msb = 8,
161 	.n_lsb = 1,
162 	.m_msb = 20,
163 	.m_lsb = 9,
164 
165 	.mX_msb[0] = 24,
166 	.mX_lsb[0] = 18,
167 
168 	.has_selfreqdco = true,
169 	.has_refsel = true,
170 };
171 
dsi_init_pll_data(struct platform_device * pdev,struct hdmi_pll_data * hpll)172 static int dsi_init_pll_data(struct platform_device *pdev, struct hdmi_pll_data *hpll)
173 {
174 	struct dss_pll *pll = &hpll->pll;
175 	struct clk *clk;
176 
177 	clk = devm_clk_get(&pdev->dev, "sys_clk");
178 	if (IS_ERR(clk)) {
179 		DSSERR("can't get sys_clk\n");
180 		return PTR_ERR(clk);
181 	}
182 
183 	pll->name = "hdmi";
184 	pll->id = DSS_PLL_HDMI;
185 	pll->base = hpll->base;
186 	pll->clkin = clk;
187 
188 	switch (omapdss_get_version()) {
189 	case OMAPDSS_VER_OMAP4430_ES1:
190 	case OMAPDSS_VER_OMAP4430_ES2:
191 	case OMAPDSS_VER_OMAP4:
192 		pll->hw = &dss_omap4_hdmi_pll_hw;
193 		break;
194 
195 	case OMAPDSS_VER_OMAP5:
196 	case OMAPDSS_VER_DRA7xx:
197 		pll->hw = &dss_omap5_hdmi_pll_hw;
198 		break;
199 
200 	default:
201 		return -ENODEV;
202 	}
203 
204 	pll->ops = &dsi_pll_ops;
205 	return dss_pll_register(pll);
206 }
207 
hdmi_pll_init(struct platform_device * pdev,struct hdmi_pll_data * pll,struct hdmi_wp_data * wp)208 int hdmi_pll_init(struct platform_device *pdev, struct hdmi_pll_data *pll,
209 	struct hdmi_wp_data *wp)
210 {
211 	int r;
212 
213 	pll->wp = wp;
214 
215 	pll->base = devm_platform_ioremap_resource_byname(pdev, "pll");
216 	if (IS_ERR(pll->base)) {
217 		DSSERR("can't ioremap PLLCTRL\n");
218 		return PTR_ERR(pll->base);
219 	}
220 
221 	r = dsi_init_pll_data(pdev, pll);
222 	if (r) {
223 		DSSERR("failed to init HDMI PLL\n");
224 		return r;
225 	}
226 
227 	return 0;
228 }
229 
hdmi_pll_uninit(struct hdmi_pll_data * hpll)230 void hdmi_pll_uninit(struct hdmi_pll_data *hpll)
231 {
232 	struct dss_pll *pll = &hpll->pll;
233 
234 	dss_pll_unregister(pll);
235 }
236