1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ispcsiphy.c
4 *
5 * TI OMAP3 ISP - CSI PHY module
6 *
7 * Copyright (C) 2010 Nokia Corporation
8 * Copyright (C) 2009 Texas Instruments, Inc.
9 *
10 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
11 * Sakari Ailus <sakari.ailus@iki.fi>
12 */
13
14 #include <linux/delay.h>
15 #include <linux/device.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/consumer.h>
18
19 #include "isp.h"
20 #include "ispreg.h"
21 #include "ispcsiphy.h"
22
csiphy_routing_cfg_3630(struct isp_csiphy * phy,enum isp_interface_type iface,bool ccp2_strobe)23 static void csiphy_routing_cfg_3630(struct isp_csiphy *phy,
24 enum isp_interface_type iface,
25 bool ccp2_strobe)
26 {
27 u32 reg;
28 u32 shift, mode;
29
30 regmap_read(phy->isp->syscon, phy->isp->syscon_offset, ®);
31
32 switch (iface) {
33 default:
34 /* Should not happen in practice, but let's keep the compiler happy. */
35 case ISP_INTERFACE_CCP2B_PHY1:
36 reg &= ~OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
37 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
38 break;
39 case ISP_INTERFACE_CSI2C_PHY1:
40 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
41 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
42 break;
43 case ISP_INTERFACE_CCP2B_PHY2:
44 reg |= OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
45 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
46 break;
47 case ISP_INTERFACE_CSI2A_PHY2:
48 shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
49 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
50 break;
51 }
52
53 /* Select data/clock or data/strobe mode for CCP2 */
54 if (iface == ISP_INTERFACE_CCP2B_PHY1 ||
55 iface == ISP_INTERFACE_CCP2B_PHY2) {
56 if (ccp2_strobe)
57 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE;
58 else
59 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK;
60 }
61
62 reg &= ~(OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK << shift);
63 reg |= mode << shift;
64
65 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, reg);
66 }
67
csiphy_routing_cfg_3430(struct isp_csiphy * phy,u32 iface,bool on,bool ccp2_strobe)68 static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
69 bool ccp2_strobe)
70 {
71 u32 csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ
72 | OMAP343X_CONTROL_CSIRXFE_RESET;
73
74 /* Only the CCP2B on PHY1 is configurable. */
75 if (iface != ISP_INTERFACE_CCP2B_PHY1)
76 return;
77
78 if (!on) {
79 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, 0);
80 return;
81 }
82
83 if (ccp2_strobe)
84 csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM;
85
86 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, csirxfe);
87 }
88
89 /*
90 * Configure OMAP 3 CSI PHY routing.
91 * @phy: relevant phy device
92 * @iface: ISP_INTERFACE_*
93 * @on: power on or off
94 * @ccp2_strobe: false: data/clock, true: data/strobe
95 *
96 * Note that the underlying routing configuration registers are part of the
97 * control (SCM) register space and part of the CORE power domain on both 3430
98 * and 3630, so they will not hold their contents in off-mode. This isn't an
99 * issue since the MPU power domain is forced on whilst the ISP is in use.
100 */
csiphy_routing_cfg(struct isp_csiphy * phy,enum isp_interface_type iface,bool on,bool ccp2_strobe)101 static void csiphy_routing_cfg(struct isp_csiphy *phy,
102 enum isp_interface_type iface, bool on,
103 bool ccp2_strobe)
104 {
105 if (phy->isp->phy_type == ISP_PHY_TYPE_3630 && on)
106 return csiphy_routing_cfg_3630(phy, iface, ccp2_strobe);
107 if (phy->isp->phy_type == ISP_PHY_TYPE_3430)
108 return csiphy_routing_cfg_3430(phy, iface, on, ccp2_strobe);
109 }
110
111 /*
112 * csiphy_power_autoswitch_enable
113 * @enable: Sets or clears the autoswitch function enable flag.
114 */
csiphy_power_autoswitch_enable(struct isp_csiphy * phy,bool enable)115 static void csiphy_power_autoswitch_enable(struct isp_csiphy *phy, bool enable)
116 {
117 isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG,
118 ISPCSI2_PHY_CFG_PWR_AUTO,
119 enable ? ISPCSI2_PHY_CFG_PWR_AUTO : 0);
120 }
121
122 /*
123 * csiphy_set_power
124 * @power: Power state to be set.
125 *
126 * Returns 0 if successful, or -EBUSY if the retry count is exceeded.
127 */
csiphy_set_power(struct isp_csiphy * phy,u32 power)128 static int csiphy_set_power(struct isp_csiphy *phy, u32 power)
129 {
130 u32 reg;
131 u8 retry_count;
132
133 isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG,
134 ISPCSI2_PHY_CFG_PWR_CMD_MASK, power);
135
136 retry_count = 0;
137 do {
138 udelay(50);
139 reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG) &
140 ISPCSI2_PHY_CFG_PWR_STATUS_MASK;
141
142 if (reg != power >> 2)
143 retry_count++;
144
145 } while ((reg != power >> 2) && (retry_count < 100));
146
147 if (retry_count == 100) {
148 dev_err(phy->isp->dev, "CSI2 CIO set power failed!\n");
149 return -EBUSY;
150 }
151
152 return 0;
153 }
154
155 /*
156 * TCLK values are OK at their reset values
157 */
158 #define TCLK_TERM 0
159 #define TCLK_MISS 1
160 #define TCLK_SETTLE 14
161
omap3isp_csiphy_config(struct isp_csiphy * phy)162 static int omap3isp_csiphy_config(struct isp_csiphy *phy)
163 {
164 struct isp_pipeline *pipe = to_isp_pipeline(phy->entity);
165 struct isp_bus_cfg *buscfg = v4l2_subdev_to_bus_cfg(pipe->external);
166 struct isp_csiphy_lanes_cfg *lanes;
167 int csi2_ddrclk_khz;
168 unsigned int num_data_lanes, used_lanes = 0;
169 unsigned int i;
170 u32 reg;
171
172 if (buscfg->interface == ISP_INTERFACE_CCP2B_PHY1
173 || buscfg->interface == ISP_INTERFACE_CCP2B_PHY2) {
174 lanes = &buscfg->bus.ccp2.lanecfg;
175 num_data_lanes = 1;
176 } else {
177 lanes = &buscfg->bus.csi2.lanecfg;
178 num_data_lanes = buscfg->bus.csi2.num_data_lanes;
179 }
180
181 if (num_data_lanes > phy->num_data_lanes)
182 return -EINVAL;
183
184 /* Clock and data lanes verification */
185 for (i = 0; i < num_data_lanes; i++) {
186 if (lanes->data[i].pol > 1 || lanes->data[i].pos > 3)
187 return -EINVAL;
188
189 if (used_lanes & (1 << lanes->data[i].pos))
190 return -EINVAL;
191
192 used_lanes |= 1 << lanes->data[i].pos;
193 }
194
195 if (lanes->clk.pol > 1 || lanes->clk.pos > 3)
196 return -EINVAL;
197
198 if (lanes->clk.pos == 0 || used_lanes & (1 << lanes->clk.pos))
199 return -EINVAL;
200
201 /*
202 * The PHY configuration is lost in off mode, that's not an
203 * issue since the MPU power domain is forced on whilst the
204 * ISP is in use.
205 */
206 csiphy_routing_cfg(phy, buscfg->interface, true,
207 buscfg->bus.ccp2.phy_layer);
208
209 /* DPHY timing configuration */
210 /* CSI-2 is DDR and we only count used lanes. */
211 csi2_ddrclk_khz = pipe->external_rate / 1000
212 / (2 * hweight32(used_lanes)) * pipe->external_width;
213
214 reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG0);
215
216 reg &= ~(ISPCSIPHY_REG0_THS_TERM_MASK |
217 ISPCSIPHY_REG0_THS_SETTLE_MASK);
218 /* THS_TERM: Programmed value = ceil(12.5 ns/DDRClk period) - 1. */
219 reg |= (DIV_ROUND_UP(25 * csi2_ddrclk_khz, 2000000) - 1)
220 << ISPCSIPHY_REG0_THS_TERM_SHIFT;
221 /* THS_SETTLE: Programmed value = ceil(90 ns/DDRClk period) + 3. */
222 reg |= (DIV_ROUND_UP(90 * csi2_ddrclk_khz, 1000000) + 3)
223 << ISPCSIPHY_REG0_THS_SETTLE_SHIFT;
224
225 isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG0);
226
227 reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG1);
228
229 reg &= ~(ISPCSIPHY_REG1_TCLK_TERM_MASK |
230 ISPCSIPHY_REG1_TCLK_MISS_MASK |
231 ISPCSIPHY_REG1_TCLK_SETTLE_MASK);
232 reg |= TCLK_TERM << ISPCSIPHY_REG1_TCLK_TERM_SHIFT;
233 reg |= TCLK_MISS << ISPCSIPHY_REG1_TCLK_MISS_SHIFT;
234 reg |= TCLK_SETTLE << ISPCSIPHY_REG1_TCLK_SETTLE_SHIFT;
235
236 isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG1);
237
238 /* DPHY lane configuration */
239 reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG);
240
241 for (i = 0; i < num_data_lanes; i++) {
242 reg &= ~(ISPCSI2_PHY_CFG_DATA_POL_MASK(i + 1) |
243 ISPCSI2_PHY_CFG_DATA_POSITION_MASK(i + 1));
244 reg |= (lanes->data[i].pol <<
245 ISPCSI2_PHY_CFG_DATA_POL_SHIFT(i + 1));
246 reg |= (lanes->data[i].pos <<
247 ISPCSI2_PHY_CFG_DATA_POSITION_SHIFT(i + 1));
248 }
249
250 reg &= ~(ISPCSI2_PHY_CFG_CLOCK_POL_MASK |
251 ISPCSI2_PHY_CFG_CLOCK_POSITION_MASK);
252 reg |= lanes->clk.pol << ISPCSI2_PHY_CFG_CLOCK_POL_SHIFT;
253 reg |= lanes->clk.pos << ISPCSI2_PHY_CFG_CLOCK_POSITION_SHIFT;
254
255 isp_reg_writel(phy->isp, reg, phy->cfg_regs, ISPCSI2_PHY_CFG);
256
257 return 0;
258 }
259
omap3isp_csiphy_acquire(struct isp_csiphy * phy,struct media_entity * entity)260 int omap3isp_csiphy_acquire(struct isp_csiphy *phy, struct media_entity *entity)
261 {
262 int rval;
263
264 if (phy->vdd == NULL) {
265 dev_err(phy->isp->dev,
266 "Power regulator for CSI PHY not available\n");
267 return -ENODEV;
268 }
269
270 mutex_lock(&phy->mutex);
271
272 rval = regulator_enable(phy->vdd);
273 if (rval < 0)
274 goto done;
275
276 rval = omap3isp_csi2_reset(phy->csi2);
277 if (rval < 0)
278 goto done;
279
280 phy->entity = entity;
281
282 rval = omap3isp_csiphy_config(phy);
283 if (rval < 0)
284 goto done;
285
286 if (phy->isp->revision == ISP_REVISION_15_0) {
287 rval = csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_ON);
288 if (rval) {
289 regulator_disable(phy->vdd);
290 goto done;
291 }
292
293 csiphy_power_autoswitch_enable(phy, true);
294 }
295 done:
296 if (rval < 0)
297 phy->entity = NULL;
298
299 mutex_unlock(&phy->mutex);
300 return rval;
301 }
302
omap3isp_csiphy_release(struct isp_csiphy * phy)303 void omap3isp_csiphy_release(struct isp_csiphy *phy)
304 {
305 mutex_lock(&phy->mutex);
306 if (phy->entity) {
307 struct isp_pipeline *pipe = to_isp_pipeline(phy->entity);
308 struct isp_bus_cfg *buscfg =
309 v4l2_subdev_to_bus_cfg(pipe->external);
310
311 csiphy_routing_cfg(phy, buscfg->interface, false,
312 buscfg->bus.ccp2.phy_layer);
313 if (phy->isp->revision == ISP_REVISION_15_0) {
314 csiphy_power_autoswitch_enable(phy, false);
315 csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_OFF);
316 }
317 regulator_disable(phy->vdd);
318 phy->entity = NULL;
319 }
320 mutex_unlock(&phy->mutex);
321 }
322
323 /*
324 * omap3isp_csiphy_init - Initialize the CSI PHY frontends
325 */
omap3isp_csiphy_init(struct isp_device * isp)326 int omap3isp_csiphy_init(struct isp_device *isp)
327 {
328 struct isp_csiphy *phy1 = &isp->isp_csiphy1;
329 struct isp_csiphy *phy2 = &isp->isp_csiphy2;
330
331 phy2->isp = isp;
332 phy2->csi2 = &isp->isp_csi2a;
333 phy2->num_data_lanes = ISP_CSIPHY2_NUM_DATA_LANES;
334 phy2->cfg_regs = OMAP3_ISP_IOMEM_CSI2A_REGS1;
335 phy2->phy_regs = OMAP3_ISP_IOMEM_CSIPHY2;
336 mutex_init(&phy2->mutex);
337
338 phy1->isp = isp;
339 mutex_init(&phy1->mutex);
340
341 if (isp->revision == ISP_REVISION_15_0) {
342 phy1->csi2 = &isp->isp_csi2c;
343 phy1->num_data_lanes = ISP_CSIPHY1_NUM_DATA_LANES;
344 phy1->cfg_regs = OMAP3_ISP_IOMEM_CSI2C_REGS1;
345 phy1->phy_regs = OMAP3_ISP_IOMEM_CSIPHY1;
346 }
347
348 return 0;
349 }
350
omap3isp_csiphy_cleanup(struct isp_device * isp)351 void omap3isp_csiphy_cleanup(struct isp_device *isp)
352 {
353 mutex_destroy(&isp->isp_csiphy1.mutex);
354 mutex_destroy(&isp->isp_csiphy2.mutex);
355 }
356