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 u16 r = 0;
104
105 dss_ctrl_pll_enable(DSS_PLL_HDMI, true);
106
107 r = hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_BOTHON_ALLCLKS);
108 if (r)
109 return r;
110
111 return 0;
112 }
113
hdmi_pll_disable(struct dss_pll * dsspll)114 static void hdmi_pll_disable(struct dss_pll *dsspll)
115 {
116 struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
117 struct hdmi_wp_data *wp = pll->wp;
118
119 hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF);
120
121 dss_ctrl_pll_enable(DSS_PLL_HDMI, false);
122 }
123
124 static const struct dss_pll_ops dsi_pll_ops = {
125 .enable = hdmi_pll_enable,
126 .disable = hdmi_pll_disable,
127 .set_config = dss_pll_write_config_type_b,
128 };
129
130 static const struct dss_pll_hw dss_omap4_hdmi_pll_hw = {
131 .n_max = 255,
132 .m_min = 20,
133 .m_max = 4095,
134 .mX_max = 127,
135 .fint_min = 500000,
136 .fint_max = 2500000,
137
138 .clkdco_min = 500000000,
139 .clkdco_low = 1000000000,
140 .clkdco_max = 2000000000,
141
142 .n_msb = 8,
143 .n_lsb = 1,
144 .m_msb = 20,
145 .m_lsb = 9,
146
147 .mX_msb[0] = 24,
148 .mX_lsb[0] = 18,
149
150 .has_selfreqdco = true,
151 };
152
153 static const struct dss_pll_hw dss_omap5_hdmi_pll_hw = {
154 .n_max = 255,
155 .m_min = 20,
156 .m_max = 2045,
157 .mX_max = 127,
158 .fint_min = 620000,
159 .fint_max = 2500000,
160
161 .clkdco_min = 750000000,
162 .clkdco_low = 1500000000,
163 .clkdco_max = 2500000000UL,
164
165 .n_msb = 8,
166 .n_lsb = 1,
167 .m_msb = 20,
168 .m_lsb = 9,
169
170 .mX_msb[0] = 24,
171 .mX_lsb[0] = 18,
172
173 .has_selfreqdco = true,
174 .has_refsel = true,
175 };
176
dsi_init_pll_data(struct platform_device * pdev,struct hdmi_pll_data * hpll)177 static int dsi_init_pll_data(struct platform_device *pdev, struct hdmi_pll_data *hpll)
178 {
179 struct dss_pll *pll = &hpll->pll;
180 struct clk *clk;
181 int r;
182
183 clk = devm_clk_get(&pdev->dev, "sys_clk");
184 if (IS_ERR(clk)) {
185 DSSERR("can't get sys_clk\n");
186 return PTR_ERR(clk);
187 }
188
189 pll->name = "hdmi";
190 pll->id = DSS_PLL_HDMI;
191 pll->base = hpll->base;
192 pll->clkin = clk;
193
194 switch (omapdss_get_version()) {
195 case OMAPDSS_VER_OMAP4430_ES1:
196 case OMAPDSS_VER_OMAP4430_ES2:
197 case OMAPDSS_VER_OMAP4:
198 pll->hw = &dss_omap4_hdmi_pll_hw;
199 break;
200
201 case OMAPDSS_VER_OMAP5:
202 case OMAPDSS_VER_DRA7xx:
203 pll->hw = &dss_omap5_hdmi_pll_hw;
204 break;
205
206 default:
207 return -ENODEV;
208 }
209
210 pll->ops = &dsi_pll_ops;
211
212 r = dss_pll_register(pll);
213 if (r)
214 return r;
215
216 return 0;
217 }
218
hdmi_pll_init(struct platform_device * pdev,struct hdmi_pll_data * pll,struct hdmi_wp_data * wp)219 int hdmi_pll_init(struct platform_device *pdev, struct hdmi_pll_data *pll,
220 struct hdmi_wp_data *wp)
221 {
222 int r;
223 struct resource *res;
224
225 pll->wp = wp;
226
227 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pll");
228 if (!res) {
229 DSSERR("can't get PLL mem resource\n");
230 return -EINVAL;
231 }
232
233 pll->base = devm_ioremap_resource(&pdev->dev, res);
234 if (IS_ERR(pll->base)) {
235 DSSERR("can't ioremap PLLCTRL\n");
236 return PTR_ERR(pll->base);
237 }
238
239 r = dsi_init_pll_data(pdev, pll);
240 if (r) {
241 DSSERR("failed to init HDMI PLL\n");
242 return r;
243 }
244
245 return 0;
246 }
247
hdmi_pll_uninit(struct hdmi_pll_data * hpll)248 void hdmi_pll_uninit(struct hdmi_pll_data *hpll)
249 {
250 struct dss_pll *pll = &hpll->pll;
251
252 dss_pll_unregister(pll);
253 }
254