xref: /linux/drivers/phy/allwinner/phy-sun6i-mipi-dphy.c (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2016 Allwinnertech Co., Ltd.
4  * Copyright (C) 2017-2018 Bootlin
5  *
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
7  */
8 
9 #include <linux/bitops.h>
10 #include <linux/clk.h>
11 #include <linux/module.h>
12 #include <linux/of_address.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15 #include <linux/reset.h>
16 
17 #include <linux/phy/phy.h>
18 #include <linux/phy/phy-mipi-dphy.h>
19 
20 #define SUN6I_DPHY_GCTL_REG		0x00
21 #define SUN6I_DPHY_GCTL_LANE_NUM(n)		((((n) - 1) & 3) << 4)
22 #define SUN6I_DPHY_GCTL_EN			BIT(0)
23 
24 #define SUN6I_DPHY_TX_CTL_REG		0x04
25 #define SUN6I_DPHY_TX_CTL_HS_TX_CLK_CONT	BIT(28)
26 
27 #define SUN6I_DPHY_RX_CTL_REG		0x08
28 #define SUN6I_DPHY_RX_CTL_EN_DBC	BIT(31)
29 #define SUN6I_DPHY_RX_CTL_RX_CLK_FORCE	BIT(24)
30 #define SUN6I_DPHY_RX_CTL_RX_D3_FORCE	BIT(23)
31 #define SUN6I_DPHY_RX_CTL_RX_D2_FORCE	BIT(22)
32 #define SUN6I_DPHY_RX_CTL_RX_D1_FORCE	BIT(21)
33 #define SUN6I_DPHY_RX_CTL_RX_D0_FORCE	BIT(20)
34 
35 #define SUN6I_DPHY_TX_TIME0_REG		0x10
36 #define SUN6I_DPHY_TX_TIME0_HS_TRAIL(n)		(((n) & 0xff) << 24)
37 #define SUN6I_DPHY_TX_TIME0_HS_PREPARE(n)	(((n) & 0xff) << 16)
38 #define SUN6I_DPHY_TX_TIME0_LP_CLK_DIV(n)	((n) & 0xff)
39 
40 #define SUN6I_DPHY_TX_TIME1_REG		0x14
41 #define SUN6I_DPHY_TX_TIME1_CLK_POST(n)		(((n) & 0xff) << 24)
42 #define SUN6I_DPHY_TX_TIME1_CLK_PRE(n)		(((n) & 0xff) << 16)
43 #define SUN6I_DPHY_TX_TIME1_CLK_ZERO(n)		(((n) & 0xff) << 8)
44 #define SUN6I_DPHY_TX_TIME1_CLK_PREPARE(n)	((n) & 0xff)
45 
46 #define SUN6I_DPHY_TX_TIME2_REG		0x18
47 #define SUN6I_DPHY_TX_TIME2_CLK_TRAIL(n)	((n) & 0xff)
48 
49 #define SUN6I_DPHY_TX_TIME3_REG		0x1c
50 
51 #define SUN6I_DPHY_TX_TIME4_REG		0x20
52 #define SUN6I_DPHY_TX_TIME4_HS_TX_ANA1(n)	(((n) & 0xff) << 8)
53 #define SUN6I_DPHY_TX_TIME4_HS_TX_ANA0(n)	((n) & 0xff)
54 
55 #define SUN6I_DPHY_RX_TIME0_REG		0x30
56 #define SUN6I_DPHY_RX_TIME0_HS_RX_SYNC(n)	(((n) & 0xff) << 24)
57 #define SUN6I_DPHY_RX_TIME0_HS_RX_CLK_MISS(n)	(((n) & 0xff) << 16)
58 #define SUN6I_DPHY_RX_TIME0_LP_RX(n)		(((n) & 0xff) << 8)
59 
60 #define SUN6I_DPHY_RX_TIME1_REG		0x34
61 #define SUN6I_DPHY_RX_TIME1_RX_DLY(n)		(((n) & 0xfff) << 20)
62 #define SUN6I_DPHY_RX_TIME1_LP_RX_ULPS_WP(n)	((n) & 0xfffff)
63 
64 #define SUN6I_DPHY_RX_TIME2_REG		0x38
65 #define SUN6I_DPHY_RX_TIME2_HS_RX_ANA1(n)	(((n) & 0xff) << 8)
66 #define SUN6I_DPHY_RX_TIME2_HS_RX_ANA0(n)	((n) & 0xff)
67 
68 #define SUN6I_DPHY_RX_TIME3_REG		0x40
69 #define SUN6I_DPHY_RX_TIME3_LPRST_DLY(n)	(((n) & 0xffff) << 16)
70 
71 #define SUN6I_DPHY_ANA0_REG		0x4c
72 #define SUN6I_DPHY_ANA0_REG_PWS			BIT(31)
73 #define SUN6I_DPHY_ANA0_REG_PWEND		BIT(30)
74 #define SUN6I_DPHY_ANA0_REG_PWENC		BIT(29)
75 #define SUN6I_DPHY_ANA0_REG_DMPC		BIT(28)
76 #define SUN6I_DPHY_ANA0_REG_DMPD(n)		(((n) & 0xf) << 24)
77 #define SUN6I_DPHY_ANA0_REG_SRXDT(n)		(((n) & 0xf) << 20)
78 #define SUN6I_DPHY_ANA0_REG_SRXCK(n)		(((n) & 0xf) << 16)
79 #define SUN6I_DPHY_ANA0_REG_SDIV2		BIT(15)
80 #define SUN6I_DPHY_ANA0_REG_SLV(n)		(((n) & 7) << 12)
81 #define SUN6I_DPHY_ANA0_REG_DEN(n)		(((n) & 0xf) << 8)
82 #define SUN6I_DPHY_ANA0_REG_PLR(n)		(((n) & 0xf) << 4)
83 #define SUN6I_DPHY_ANA0_REG_SFB(n)		(((n) & 3) << 2)
84 #define SUN6I_DPHY_ANA0_REG_RSD			BIT(1)
85 #define SUN6I_DPHY_ANA0_REG_SELSCK		BIT(0)
86 
87 #define SUN6I_DPHY_ANA1_REG		0x50
88 #define SUN6I_DPHY_ANA1_REG_VTTMODE		BIT(31)
89 #define SUN6I_DPHY_ANA1_REG_CSMPS(n)		(((n) & 3) << 28)
90 #define SUN6I_DPHY_ANA1_REG_SVTT(n)		(((n) & 0xf) << 24)
91 
92 #define SUN6I_DPHY_ANA2_REG		0x54
93 #define SUN6I_DPHY_ANA2_EN_P2S_CPU(n)		(((n) & 0xf) << 24)
94 #define SUN6I_DPHY_ANA2_EN_P2S_CPU_MASK		GENMASK(27, 24)
95 #define SUN6I_DPHY_ANA2_EN_CK_CPU		BIT(4)
96 #define SUN6I_DPHY_ANA2_REG_ENIB		BIT(1)
97 
98 #define SUN6I_DPHY_ANA3_REG		0x58
99 #define SUN6I_DPHY_ANA3_EN_VTTD(n)		(((n) & 0xf) << 28)
100 #define SUN6I_DPHY_ANA3_EN_VTTD_MASK		GENMASK(31, 28)
101 #define SUN6I_DPHY_ANA3_EN_VTTC			BIT(27)
102 #define SUN6I_DPHY_ANA3_EN_DIV			BIT(26)
103 #define SUN6I_DPHY_ANA3_EN_LDOC			BIT(25)
104 #define SUN6I_DPHY_ANA3_EN_LDOD			BIT(24)
105 #define SUN6I_DPHY_ANA3_EN_LDOR			BIT(18)
106 
107 #define SUN6I_DPHY_ANA4_REG		0x5c
108 #define SUN6I_DPHY_ANA4_REG_EN_MIPI		BIT(31)
109 #define SUN6I_DPHY_ANA4_REG_EN_COMTEST		BIT(30)
110 #define SUN6I_DPHY_ANA4_REG_COMTEST(n)		(((n) & 3) << 28)
111 #define SUN6I_DPHY_ANA4_REG_IB(n)		(((n) & 3) << 25)
112 #define SUN6I_DPHY_ANA4_REG_DMPLVC		BIT(24)
113 #define SUN6I_DPHY_ANA4_REG_DMPLVD(n)		(((n) & 0xf) << 20)
114 #define SUN6I_DPHY_ANA4_REG_VTT_SET(n)		(((n) & 0x7) << 17)
115 #define SUN6I_DPHY_ANA4_REG_CKDV(n)		(((n) & 0x1f) << 12)
116 #define SUN6I_DPHY_ANA4_REG_TMSC(n)		(((n) & 3) << 10)
117 #define SUN6I_DPHY_ANA4_REG_TMSD(n)		(((n) & 3) << 8)
118 #define SUN6I_DPHY_ANA4_REG_TXDNSC(n)		(((n) & 3) << 6)
119 #define SUN6I_DPHY_ANA4_REG_TXDNSD(n)		(((n) & 3) << 4)
120 #define SUN6I_DPHY_ANA4_REG_TXPUSC(n)		(((n) & 3) << 2)
121 #define SUN6I_DPHY_ANA4_REG_TXPUSD(n)		((n) & 3)
122 
123 #define SUN6I_DPHY_DBG5_REG		0xf4
124 
125 #define SUN50I_DPHY_TX_SLEW_REG0	0xf8
126 #define SUN50I_DPHY_TX_SLEW_REG1	0xfc
127 #define SUN50I_DPHY_TX_SLEW_REG2	0x100
128 
129 #define SUN50I_DPHY_PLL_REG0		0x104
130 #define SUN50I_DPHY_PLL_REG0_CP36_EN		BIT(23)
131 #define SUN50I_DPHY_PLL_REG0_LDO_EN		BIT(22)
132 #define SUN50I_DPHY_PLL_REG0_EN_LVS		BIT(21)
133 #define SUN50I_DPHY_PLL_REG0_PLL_EN		BIT(20)
134 #define SUN50I_DPHY_PLL_REG0_P(n)		(((n) & 0xf) << 16)
135 #define SUN50I_DPHY_PLL_REG0_N(n)		(((n) & 0xff) << 8)
136 #define SUN50I_DPHY_PLL_REG0_NDET		BIT(7)
137 #define SUN50I_DPHY_PLL_REG0_TDIV		BIT(6)
138 #define SUN50I_DPHY_PLL_REG0_M0(n)		(((n) & 3) << 4)
139 #define SUN50I_DPHY_PLL_REG0_M1(n)		((n) & 0xf)
140 
141 #define SUN50I_DPHY_PLL_REG1		0x108
142 #define SUN50I_DPHY_PLL_REG1_UNLOCK_MDSEL(n)	(((n) & 3) << 14)
143 #define SUN50I_DPHY_PLL_REG1_LOCKMDSEL		BIT(13)
144 #define SUN50I_DPHY_PLL_REG1_LOCKDET_EN		BIT(12)
145 #define SUN50I_DPHY_PLL_REG1_VSETA(n)		(((n) & 0x7) << 9)
146 #define SUN50I_DPHY_PLL_REG1_VSETD(n)		(((n) & 0x7) << 6)
147 #define SUN50I_DPHY_PLL_REG1_LPF_SW		BIT(5)
148 #define SUN50I_DPHY_PLL_REG1_ICP_SEL(n)		(((n) & 3) << 3)
149 #define SUN50I_DPHY_PLL_REG1_ATEST_SEL(n)	(((n) & 3) << 1)
150 #define SUN50I_DPHY_PLL_REG1_TEST_EN		BIT(0)
151 
152 #define SUN50I_DPHY_PLL_REG2		0x10c
153 #define SUN50I_DPHY_PLL_REG2_SDM_EN		BIT(31)
154 #define SUN50I_DPHY_PLL_REG2_FF_EN		BIT(30)
155 #define SUN50I_DPHY_PLL_REG2_SS_EN		BIT(29)
156 #define SUN50I_DPHY_PLL_REG2_SS_FRAC(n)		(((n) & 0x1ff) << 20)
157 #define SUN50I_DPHY_PLL_REG2_SS_INT(n)		(((n) & 0xff) << 12)
158 #define SUN50I_DPHY_PLL_REG2_FRAC(n)		((n) & 0xfff)
159 
160 #define SUN50I_COMBO_PHY_REG0		0x110
161 #define SUN50I_COMBO_PHY_REG0_EN_TEST_COMBOLDO	BIT(5)
162 #define SUN50I_COMBO_PHY_REG0_EN_TEST_0P8	BIT(4)
163 #define SUN50I_COMBO_PHY_REG0_EN_MIPI		BIT(3)
164 #define SUN50I_COMBO_PHY_REG0_EN_LVDS		BIT(2)
165 #define SUN50I_COMBO_PHY_REG0_EN_COMBOLDO	BIT(1)
166 #define SUN50I_COMBO_PHY_REG0_EN_CP		BIT(0)
167 
168 #define SUN50I_COMBO_PHY_REG1		0x114
169 #define SUN50I_COMBO_PHY_REG2_REG_VREF1P6(n)	(((n) & 0x7) << 4)
170 #define SUN50I_COMBO_PHY_REG2_REG_VREF0P8(n)	((n) & 0x7)
171 
172 #define SUN50I_COMBO_PHY_REG2		0x118
173 #define SUN50I_COMBO_PHY_REG2_HS_STOP_DLY(n)	((n) & 0xff)
174 
175 enum sun6i_dphy_direction {
176 	SUN6I_DPHY_DIRECTION_TX,
177 	SUN6I_DPHY_DIRECTION_RX,
178 };
179 
180 struct sun6i_dphy;
181 
182 struct sun6i_dphy_variant {
183 	void	(*tx_power_on)(struct sun6i_dphy *dphy);
184 	bool	rx_supported;
185 };
186 
187 struct sun6i_dphy {
188 	struct clk				*bus_clk;
189 	struct clk				*mod_clk;
190 	struct regmap				*regs;
191 	struct reset_control			*reset;
192 
193 	struct phy				*phy;
194 	struct phy_configure_opts_mipi_dphy	config;
195 
196 	const struct sun6i_dphy_variant		*variant;
197 	enum sun6i_dphy_direction		direction;
198 };
199 
sun6i_dphy_init(struct phy * phy)200 static int sun6i_dphy_init(struct phy *phy)
201 {
202 	struct sun6i_dphy *dphy = phy_get_drvdata(phy);
203 
204 	reset_control_deassert(dphy->reset);
205 	clk_prepare_enable(dphy->mod_clk);
206 	clk_set_rate_exclusive(dphy->mod_clk, 150000000);
207 
208 	return 0;
209 }
210 
sun6i_dphy_configure(struct phy * phy,union phy_configure_opts * opts)211 static int sun6i_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
212 {
213 	struct sun6i_dphy *dphy = phy_get_drvdata(phy);
214 	int ret;
215 
216 	ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
217 	if (ret)
218 		return ret;
219 
220 	memcpy(&dphy->config, opts, sizeof(dphy->config));
221 
222 	return 0;
223 }
224 
sun6i_a31_mipi_dphy_tx_power_on(struct sun6i_dphy * dphy)225 static void sun6i_a31_mipi_dphy_tx_power_on(struct sun6i_dphy *dphy)
226 {
227 	u8 lanes_mask = GENMASK(dphy->config.lanes - 1, 0);
228 
229 	regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG,
230 		     SUN6I_DPHY_ANA0_REG_PWS |
231 		     SUN6I_DPHY_ANA0_REG_DMPC |
232 		     SUN6I_DPHY_ANA0_REG_SLV(7) |
233 		     SUN6I_DPHY_ANA0_REG_DMPD(lanes_mask) |
234 		     SUN6I_DPHY_ANA0_REG_DEN(lanes_mask));
235 
236 	regmap_write(dphy->regs, SUN6I_DPHY_ANA1_REG,
237 		     SUN6I_DPHY_ANA1_REG_CSMPS(1) |
238 		     SUN6I_DPHY_ANA1_REG_SVTT(7));
239 
240 	regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG,
241 		     SUN6I_DPHY_ANA4_REG_CKDV(1) |
242 		     SUN6I_DPHY_ANA4_REG_TMSC(1) |
243 		     SUN6I_DPHY_ANA4_REG_TMSD(1) |
244 		     SUN6I_DPHY_ANA4_REG_TXDNSC(1) |
245 		     SUN6I_DPHY_ANA4_REG_TXDNSD(1) |
246 		     SUN6I_DPHY_ANA4_REG_TXPUSC(1) |
247 		     SUN6I_DPHY_ANA4_REG_TXPUSD(1) |
248 		     SUN6I_DPHY_ANA4_REG_DMPLVC |
249 		     SUN6I_DPHY_ANA4_REG_DMPLVD(lanes_mask));
250 
251 	regmap_write(dphy->regs, SUN6I_DPHY_ANA2_REG,
252 		     SUN6I_DPHY_ANA2_REG_ENIB);
253 	udelay(5);
254 
255 	regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG,
256 		     SUN6I_DPHY_ANA3_EN_LDOR |
257 		     SUN6I_DPHY_ANA3_EN_LDOC |
258 		     SUN6I_DPHY_ANA3_EN_LDOD);
259 	udelay(1);
260 }
261 
sun50i_a100_mipi_dphy_tx_power_on(struct sun6i_dphy * dphy)262 static void sun50i_a100_mipi_dphy_tx_power_on(struct sun6i_dphy *dphy)
263 {
264 	unsigned long mipi_symbol_rate = dphy->config.hs_clk_rate;
265 	unsigned int div, n;
266 
267 	regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG,
268 		     SUN6I_DPHY_ANA4_REG_IB(2) |
269 		     SUN6I_DPHY_ANA4_REG_DMPLVD(4) |
270 		     SUN6I_DPHY_ANA4_REG_VTT_SET(3) |
271 		     SUN6I_DPHY_ANA4_REG_CKDV(3) |
272 		     SUN6I_DPHY_ANA4_REG_TMSD(1) |
273 		     SUN6I_DPHY_ANA4_REG_TMSC(1) |
274 		     SUN6I_DPHY_ANA4_REG_TXPUSD(2) |
275 		     SUN6I_DPHY_ANA4_REG_TXPUSC(3) |
276 		     SUN6I_DPHY_ANA4_REG_TXDNSD(2) |
277 		     SUN6I_DPHY_ANA4_REG_TXDNSC(3));
278 
279 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
280 			   SUN6I_DPHY_ANA2_EN_CK_CPU,
281 			   SUN6I_DPHY_ANA2_EN_CK_CPU);
282 
283 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
284 			   SUN6I_DPHY_ANA2_REG_ENIB,
285 			   SUN6I_DPHY_ANA2_REG_ENIB);
286 
287 	regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG,
288 		     SUN6I_DPHY_ANA3_EN_LDOR |
289 		     SUN6I_DPHY_ANA3_EN_LDOC |
290 		     SUN6I_DPHY_ANA3_EN_LDOD);
291 
292 	regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG,
293 		     SUN6I_DPHY_ANA0_REG_PLR(4) |
294 		     SUN6I_DPHY_ANA0_REG_SFB(1));
295 
296 	regmap_write(dphy->regs, SUN50I_COMBO_PHY_REG0,
297 		     SUN50I_COMBO_PHY_REG0_EN_CP);
298 
299 	/* Choose a divider to limit the VCO frequency to around 2 GHz. */
300 	div = 16 >> order_base_2(DIV_ROUND_UP(mipi_symbol_rate, 264000000));
301 	n = mipi_symbol_rate * div / 24000000;
302 
303 	regmap_write(dphy->regs, SUN50I_DPHY_PLL_REG0,
304 		     SUN50I_DPHY_PLL_REG0_CP36_EN |
305 		     SUN50I_DPHY_PLL_REG0_LDO_EN |
306 		     SUN50I_DPHY_PLL_REG0_EN_LVS |
307 		     SUN50I_DPHY_PLL_REG0_PLL_EN |
308 		     SUN50I_DPHY_PLL_REG0_NDET |
309 		     SUN50I_DPHY_PLL_REG0_P((div - 1) % 8) |
310 		     SUN50I_DPHY_PLL_REG0_N(n) |
311 		     SUN50I_DPHY_PLL_REG0_M0((div - 1) / 8) |
312 		     SUN50I_DPHY_PLL_REG0_M1(2));
313 
314 	/* Disable sigma-delta modulation. */
315 	regmap_write(dphy->regs, SUN50I_DPHY_PLL_REG2, 0);
316 
317 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA4_REG,
318 			   SUN6I_DPHY_ANA4_REG_EN_MIPI,
319 			   SUN6I_DPHY_ANA4_REG_EN_MIPI);
320 
321 	regmap_update_bits(dphy->regs, SUN50I_COMBO_PHY_REG0,
322 			   SUN50I_COMBO_PHY_REG0_EN_MIPI |
323 			   SUN50I_COMBO_PHY_REG0_EN_COMBOLDO,
324 			   SUN50I_COMBO_PHY_REG0_EN_MIPI |
325 			   SUN50I_COMBO_PHY_REG0_EN_COMBOLDO);
326 
327 	regmap_write(dphy->regs, SUN50I_COMBO_PHY_REG2,
328 		     SUN50I_COMBO_PHY_REG2_HS_STOP_DLY(20));
329 	udelay(1);
330 }
331 
sun6i_dphy_tx_power_on(struct sun6i_dphy * dphy)332 static int sun6i_dphy_tx_power_on(struct sun6i_dphy *dphy)
333 {
334 	u8 lanes_mask = GENMASK(dphy->config.lanes - 1, 0);
335 
336 	regmap_write(dphy->regs, SUN6I_DPHY_TX_CTL_REG,
337 		     SUN6I_DPHY_TX_CTL_HS_TX_CLK_CONT);
338 
339 	regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME0_REG,
340 		     SUN6I_DPHY_TX_TIME0_LP_CLK_DIV(14) |
341 		     SUN6I_DPHY_TX_TIME0_HS_PREPARE(6) |
342 		     SUN6I_DPHY_TX_TIME0_HS_TRAIL(10));
343 
344 	regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME1_REG,
345 		     SUN6I_DPHY_TX_TIME1_CLK_PREPARE(7) |
346 		     SUN6I_DPHY_TX_TIME1_CLK_ZERO(50) |
347 		     SUN6I_DPHY_TX_TIME1_CLK_PRE(3) |
348 		     SUN6I_DPHY_TX_TIME1_CLK_POST(10));
349 
350 	regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME2_REG,
351 		     SUN6I_DPHY_TX_TIME2_CLK_TRAIL(30));
352 
353 	regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME3_REG, 0);
354 
355 	regmap_write(dphy->regs, SUN6I_DPHY_TX_TIME4_REG,
356 		     SUN6I_DPHY_TX_TIME4_HS_TX_ANA0(3) |
357 		     SUN6I_DPHY_TX_TIME4_HS_TX_ANA1(3));
358 
359 	dphy->variant->tx_power_on(dphy);
360 
361 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA3_REG,
362 			   SUN6I_DPHY_ANA3_EN_VTTC |
363 			   SUN6I_DPHY_ANA3_EN_VTTD_MASK,
364 			   SUN6I_DPHY_ANA3_EN_VTTC |
365 			   SUN6I_DPHY_ANA3_EN_VTTD(lanes_mask));
366 	udelay(1);
367 
368 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA3_REG,
369 			   SUN6I_DPHY_ANA3_EN_DIV,
370 			   SUN6I_DPHY_ANA3_EN_DIV);
371 	udelay(1);
372 
373 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
374 			   SUN6I_DPHY_ANA2_EN_CK_CPU,
375 			   SUN6I_DPHY_ANA2_EN_CK_CPU);
376 	udelay(1);
377 
378 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA1_REG,
379 			   SUN6I_DPHY_ANA1_REG_VTTMODE,
380 			   SUN6I_DPHY_ANA1_REG_VTTMODE);
381 
382 	regmap_update_bits(dphy->regs, SUN6I_DPHY_ANA2_REG,
383 			   SUN6I_DPHY_ANA2_EN_P2S_CPU_MASK,
384 			   SUN6I_DPHY_ANA2_EN_P2S_CPU(lanes_mask));
385 
386 	regmap_write(dphy->regs, SUN6I_DPHY_GCTL_REG,
387 		     SUN6I_DPHY_GCTL_LANE_NUM(dphy->config.lanes) |
388 		     SUN6I_DPHY_GCTL_EN);
389 
390 	return 0;
391 }
392 
sun6i_dphy_rx_power_on(struct sun6i_dphy * dphy)393 static int sun6i_dphy_rx_power_on(struct sun6i_dphy *dphy)
394 {
395 	/* Physical clock rate is actually half of symbol rate with DDR. */
396 	unsigned long mipi_symbol_rate = dphy->config.hs_clk_rate;
397 	unsigned long dphy_clk_rate;
398 	unsigned int rx_dly;
399 	unsigned int lprst_dly;
400 	u32 value;
401 
402 	dphy_clk_rate = clk_get_rate(dphy->mod_clk);
403 	if (!dphy_clk_rate)
404 		return -EINVAL;
405 
406 	/* Hardcoded timing parameters from the Allwinner BSP. */
407 	regmap_write(dphy->regs, SUN6I_DPHY_RX_TIME0_REG,
408 		     SUN6I_DPHY_RX_TIME0_HS_RX_SYNC(255) |
409 		     SUN6I_DPHY_RX_TIME0_HS_RX_CLK_MISS(255) |
410 		     SUN6I_DPHY_RX_TIME0_LP_RX(255));
411 
412 	/*
413 	 * Formula from the Allwinner BSP, with hardcoded coefficients
414 	 * (probably internal divider/multiplier).
415 	 */
416 	rx_dly = 8 * (unsigned int)(dphy_clk_rate / (mipi_symbol_rate / 8));
417 
418 	/*
419 	 * The Allwinner BSP has an alternative formula for LP_RX_ULPS_WP:
420 	 * lp_ulps_wp_cnt = lp_ulps_wp_ms * lp_clk / 1000
421 	 * but does not use it and hardcodes 255 instead.
422 	 */
423 	regmap_write(dphy->regs, SUN6I_DPHY_RX_TIME1_REG,
424 		     SUN6I_DPHY_RX_TIME1_RX_DLY(rx_dly) |
425 		     SUN6I_DPHY_RX_TIME1_LP_RX_ULPS_WP(255));
426 
427 	/* HS_RX_ANA0 value is hardcoded in the Allwinner BSP. */
428 	regmap_write(dphy->regs, SUN6I_DPHY_RX_TIME2_REG,
429 		     SUN6I_DPHY_RX_TIME2_HS_RX_ANA0(4));
430 
431 	/*
432 	 * Formula from the Allwinner BSP, with hardcoded coefficients
433 	 * (probably internal divider/multiplier).
434 	 */
435 	lprst_dly = 4 * (unsigned int)(dphy_clk_rate / (mipi_symbol_rate / 2));
436 
437 	regmap_write(dphy->regs, SUN6I_DPHY_RX_TIME3_REG,
438 		     SUN6I_DPHY_RX_TIME3_LPRST_DLY(lprst_dly));
439 
440 	/* Analog parameters are hardcoded in the Allwinner BSP. */
441 	regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG,
442 		     SUN6I_DPHY_ANA0_REG_PWS |
443 		     SUN6I_DPHY_ANA0_REG_SLV(7) |
444 		     SUN6I_DPHY_ANA0_REG_SFB(2));
445 
446 	regmap_write(dphy->regs, SUN6I_DPHY_ANA1_REG,
447 		     SUN6I_DPHY_ANA1_REG_SVTT(4));
448 
449 	regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG,
450 		     SUN6I_DPHY_ANA4_REG_DMPLVC |
451 		     SUN6I_DPHY_ANA4_REG_DMPLVD(1));
452 
453 	regmap_write(dphy->regs, SUN6I_DPHY_ANA2_REG,
454 		     SUN6I_DPHY_ANA2_REG_ENIB);
455 
456 	regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG,
457 		     SUN6I_DPHY_ANA3_EN_LDOR |
458 		     SUN6I_DPHY_ANA3_EN_LDOC |
459 		     SUN6I_DPHY_ANA3_EN_LDOD);
460 
461 	/*
462 	 * Delay comes from the Allwinner BSP, likely for internal regulator
463 	 * ramp-up.
464 	 */
465 	udelay(3);
466 
467 	value = SUN6I_DPHY_RX_CTL_EN_DBC | SUN6I_DPHY_RX_CTL_RX_CLK_FORCE;
468 
469 	/*
470 	 * Rx data lane force-enable bits are used as regular RX enable by the
471 	 * Allwinner BSP.
472 	 */
473 	if (dphy->config.lanes >= 1)
474 		value |= SUN6I_DPHY_RX_CTL_RX_D0_FORCE;
475 	if (dphy->config.lanes >= 2)
476 		value |= SUN6I_DPHY_RX_CTL_RX_D1_FORCE;
477 	if (dphy->config.lanes >= 3)
478 		value |= SUN6I_DPHY_RX_CTL_RX_D2_FORCE;
479 	if (dphy->config.lanes == 4)
480 		value |= SUN6I_DPHY_RX_CTL_RX_D3_FORCE;
481 
482 	regmap_write(dphy->regs, SUN6I_DPHY_RX_CTL_REG, value);
483 
484 	regmap_write(dphy->regs, SUN6I_DPHY_GCTL_REG,
485 		     SUN6I_DPHY_GCTL_LANE_NUM(dphy->config.lanes) |
486 		     SUN6I_DPHY_GCTL_EN);
487 
488 	return 0;
489 }
490 
sun6i_dphy_power_on(struct phy * phy)491 static int sun6i_dphy_power_on(struct phy *phy)
492 {
493 	struct sun6i_dphy *dphy = phy_get_drvdata(phy);
494 
495 	switch (dphy->direction) {
496 	case SUN6I_DPHY_DIRECTION_TX:
497 		return sun6i_dphy_tx_power_on(dphy);
498 	case SUN6I_DPHY_DIRECTION_RX:
499 		return sun6i_dphy_rx_power_on(dphy);
500 	default:
501 		return -EINVAL;
502 	}
503 }
504 
sun6i_dphy_power_off(struct phy * phy)505 static int sun6i_dphy_power_off(struct phy *phy)
506 {
507 	struct sun6i_dphy *dphy = phy_get_drvdata(phy);
508 
509 	regmap_write(dphy->regs, SUN6I_DPHY_GCTL_REG, 0);
510 
511 	regmap_write(dphy->regs, SUN6I_DPHY_ANA0_REG, 0);
512 	regmap_write(dphy->regs, SUN6I_DPHY_ANA1_REG, 0);
513 	regmap_write(dphy->regs, SUN6I_DPHY_ANA2_REG, 0);
514 	regmap_write(dphy->regs, SUN6I_DPHY_ANA3_REG, 0);
515 	regmap_write(dphy->regs, SUN6I_DPHY_ANA4_REG, 0);
516 
517 	return 0;
518 }
519 
sun6i_dphy_exit(struct phy * phy)520 static int sun6i_dphy_exit(struct phy *phy)
521 {
522 	struct sun6i_dphy *dphy = phy_get_drvdata(phy);
523 
524 	clk_rate_exclusive_put(dphy->mod_clk);
525 	clk_disable_unprepare(dphy->mod_clk);
526 	reset_control_assert(dphy->reset);
527 
528 	return 0;
529 }
530 
531 
532 static const struct phy_ops sun6i_dphy_ops = {
533 	.configure	= sun6i_dphy_configure,
534 	.power_on	= sun6i_dphy_power_on,
535 	.power_off	= sun6i_dphy_power_off,
536 	.init		= sun6i_dphy_init,
537 	.exit		= sun6i_dphy_exit,
538 };
539 
540 static const struct regmap_config sun6i_dphy_regmap_config = {
541 	.reg_bits	= 32,
542 	.val_bits	= 32,
543 	.reg_stride	= 4,
544 	.max_register	= SUN50I_COMBO_PHY_REG2,
545 	.name		= "mipi-dphy",
546 };
547 
sun6i_dphy_probe(struct platform_device * pdev)548 static int sun6i_dphy_probe(struct platform_device *pdev)
549 {
550 	struct phy_provider *phy_provider;
551 	struct sun6i_dphy *dphy;
552 	const char *direction;
553 	void __iomem *regs;
554 	int ret;
555 
556 	dphy = devm_kzalloc(&pdev->dev, sizeof(*dphy), GFP_KERNEL);
557 	if (!dphy)
558 		return -ENOMEM;
559 
560 	dphy->variant = device_get_match_data(&pdev->dev);
561 	if (!dphy->variant)
562 		return -EINVAL;
563 
564 	regs = devm_platform_ioremap_resource(pdev, 0);
565 	if (IS_ERR(regs)) {
566 		dev_err(&pdev->dev, "Couldn't map the DPHY encoder registers\n");
567 		return PTR_ERR(regs);
568 	}
569 
570 	dphy->regs = devm_regmap_init_mmio_clk(&pdev->dev, "bus",
571 					       regs, &sun6i_dphy_regmap_config);
572 	if (IS_ERR(dphy->regs)) {
573 		dev_err(&pdev->dev, "Couldn't create the DPHY encoder regmap\n");
574 		return PTR_ERR(dphy->regs);
575 	}
576 
577 	dphy->reset = devm_reset_control_get_shared(&pdev->dev, NULL);
578 	if (IS_ERR(dphy->reset)) {
579 		dev_err(&pdev->dev, "Couldn't get our reset line\n");
580 		return PTR_ERR(dphy->reset);
581 	}
582 
583 	dphy->mod_clk = devm_clk_get(&pdev->dev, "mod");
584 	if (IS_ERR(dphy->mod_clk)) {
585 		dev_err(&pdev->dev, "Couldn't get the DPHY mod clock\n");
586 		return PTR_ERR(dphy->mod_clk);
587 	}
588 
589 	dphy->phy = devm_phy_create(&pdev->dev, NULL, &sun6i_dphy_ops);
590 	if (IS_ERR(dphy->phy)) {
591 		dev_err(&pdev->dev, "failed to create PHY\n");
592 		return PTR_ERR(dphy->phy);
593 	}
594 
595 	dphy->direction = SUN6I_DPHY_DIRECTION_TX;
596 
597 	ret = of_property_read_string(pdev->dev.of_node, "allwinner,direction",
598 				      &direction);
599 
600 	if (!ret && !strncmp(direction, "rx", 2)) {
601 		if (!dphy->variant->rx_supported) {
602 			dev_err(&pdev->dev, "RX not supported on this variant\n");
603 			return -EOPNOTSUPP;
604 		}
605 
606 		dphy->direction = SUN6I_DPHY_DIRECTION_RX;
607 	}
608 
609 	phy_set_drvdata(dphy->phy, dphy);
610 	phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
611 
612 	return PTR_ERR_OR_ZERO(phy_provider);
613 }
614 
615 static const struct sun6i_dphy_variant sun6i_a31_mipi_dphy_variant = {
616 	.tx_power_on	= sun6i_a31_mipi_dphy_tx_power_on,
617 	.rx_supported	= true,
618 };
619 
620 static const struct sun6i_dphy_variant sun50i_a100_mipi_dphy_variant = {
621 	.tx_power_on	= sun50i_a100_mipi_dphy_tx_power_on,
622 };
623 
624 static const struct of_device_id sun6i_dphy_of_table[] = {
625 	{
626 		.compatible	= "allwinner,sun6i-a31-mipi-dphy",
627 		.data		= &sun6i_a31_mipi_dphy_variant,
628 	},
629 	{
630 		.compatible	= "allwinner,sun50i-a100-mipi-dphy",
631 		.data		= &sun50i_a100_mipi_dphy_variant,
632 	},
633 	{ }
634 };
635 MODULE_DEVICE_TABLE(of, sun6i_dphy_of_table);
636 
637 static struct platform_driver sun6i_dphy_platform_driver = {
638 	.probe		= sun6i_dphy_probe,
639 	.driver		= {
640 		.name		= "sun6i-mipi-dphy",
641 		.of_match_table	= sun6i_dphy_of_table,
642 	},
643 };
644 module_platform_driver(sun6i_dphy_platform_driver);
645 
646 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@bootlin>");
647 MODULE_DESCRIPTION("Allwinner A31 MIPI D-PHY Driver");
648 MODULE_LICENSE("GPL");
649