1 // SPDX-License-Identifier: GPL-2.0-only
5 * TI OMAP3 ISP - CSI PHY module
7 * Copyright (C) 2010 Nokia Corporation
8 * Copyright (C) 2009 Texas Instruments, Inc.
10 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
11 * Sakari Ailus <sakari.ailus@iki.fi>
14 #include <linux/delay.h>
15 #include <linux/device.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/consumer.h>
21 #include "ispcsiphy.h"
23 static void csiphy_routing_cfg_3630(struct isp_csiphy *phy,
24 enum isp_interface_type iface,
30 regmap_read(phy->isp->syscon, phy->isp->syscon_offset, ®);
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;
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;
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;
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;
53 /* Select data/clock or data/strobe mode for CCP2 */
54 if (iface == ISP_INTERFACE_CCP2B_PHY1 ||
55 iface == ISP_INTERFACE_CCP2B_PHY2) {
57 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE;
59 mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK;
62 reg &= ~(OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK << shift);
65 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, reg);
68 static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
71 u32 csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ
72 | OMAP343X_CONTROL_CSIRXFE_RESET;
74 /* Only the CCP2B on PHY1 is configurable. */
75 if (iface != ISP_INTERFACE_CCP2B_PHY1)
79 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, 0);
84 csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM;
86 regmap_write(phy->isp->syscon, phy->isp->syscon_offset, csirxfe);
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
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.
101 static void csiphy_routing_cfg(struct isp_csiphy *phy,
102 enum isp_interface_type iface, bool on,
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);
112 * csiphy_power_autoswitch_enable
113 * @enable: Sets or clears the autoswitch function enable flag.
115 static void csiphy_power_autoswitch_enable(struct isp_csiphy *phy, bool enable)
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);
124 * @power: Power state to be set.
126 * Returns 0 if successful, or -EBUSY if the retry count is exceeded.
128 static int csiphy_set_power(struct isp_csiphy *phy, u32 power)
133 isp_reg_clr_set(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG,
134 ISPCSI2_PHY_CFG_PWR_CMD_MASK, power);
139 reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG) &
140 ISPCSI2_PHY_CFG_PWR_STATUS_MASK;
142 if (reg != power >> 2)
145 } while ((reg != power >> 2) && (retry_count < 100));
147 if (retry_count == 100) {
148 dev_err(phy->isp->dev, "CSI2 CIO set power failed!\n");
156 * TCLK values are OK at their reset values
160 #define TCLK_SETTLE 14
162 static int omap3isp_csiphy_config(struct isp_csiphy *phy)
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;
168 unsigned int num_data_lanes, used_lanes = 0;
172 if (buscfg->interface == ISP_INTERFACE_CCP2B_PHY1
173 || buscfg->interface == ISP_INTERFACE_CCP2B_PHY2) {
174 lanes = &buscfg->bus.ccp2.lanecfg;
177 lanes = &buscfg->bus.csi2.lanecfg;
178 num_data_lanes = buscfg->bus.csi2.num_data_lanes;
181 if (num_data_lanes > phy->num_data_lanes)
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)
189 if (used_lanes & (1 << lanes->data[i].pos))
192 used_lanes |= 1 << lanes->data[i].pos;
195 if (lanes->clk.pol > 1 || lanes->clk.pos > 3)
198 if (lanes->clk.pos == 0 || used_lanes & (1 << lanes->clk.pos))
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
206 csiphy_routing_cfg(phy, buscfg->interface, true,
207 buscfg->bus.ccp2.phy_layer);
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;
214 reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG0);
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;
225 isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG0);
227 reg = isp_reg_readl(phy->isp, phy->phy_regs, ISPCSIPHY_REG1);
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;
236 isp_reg_writel(phy->isp, reg, phy->phy_regs, ISPCSIPHY_REG1);
238 /* DPHY lane configuration */
239 reg = isp_reg_readl(phy->isp, phy->cfg_regs, ISPCSI2_PHY_CFG);
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));
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;
255 isp_reg_writel(phy->isp, reg, phy->cfg_regs, ISPCSI2_PHY_CFG);
260 int omap3isp_csiphy_acquire(struct isp_csiphy *phy, struct media_entity *entity)
264 if (phy->vdd == NULL) {
265 dev_err(phy->isp->dev,
266 "Power regulator for CSI PHY not available\n");
270 mutex_lock(&phy->mutex);
272 rval = regulator_enable(phy->vdd);
276 rval = omap3isp_csi2_reset(phy->csi2);
280 phy->entity = entity;
282 rval = omap3isp_csiphy_config(phy);
286 if (phy->isp->revision == ISP_REVISION_15_0) {
287 rval = csiphy_set_power(phy, ISPCSI2_PHY_CFG_PWR_CMD_ON);
289 regulator_disable(phy->vdd);
293 csiphy_power_autoswitch_enable(phy, true);
299 mutex_unlock(&phy->mutex);
303 void omap3isp_csiphy_release(struct isp_csiphy *phy)
305 mutex_lock(&phy->mutex);
307 struct isp_pipeline *pipe = to_isp_pipeline(phy->entity);
308 struct isp_bus_cfg *buscfg =
309 v4l2_subdev_to_bus_cfg(pipe->external);
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);
317 regulator_disable(phy->vdd);
320 mutex_unlock(&phy->mutex);
324 * omap3isp_csiphy_init - Initialize the CSI PHY frontends
326 int omap3isp_csiphy_init(struct isp_device *isp)
328 struct isp_csiphy *phy1 = &isp->isp_csiphy1;
329 struct isp_csiphy *phy2 = &isp->isp_csiphy2;
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);
339 mutex_init(&phy1->mutex);
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;
351 void omap3isp_csiphy_cleanup(struct isp_device *isp)
353 mutex_destroy(&isp->isp_csiphy1.mutex);
354 mutex_destroy(&isp->isp_csiphy2.mutex);