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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2016 Maxime Ripard
4  *
5  * Maxime Ripard <maxime.ripard@free-electrons.com>
6  */
7 
8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/iopoll.h>
11 #include <linux/module.h>
12 #include <linux/of_device.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16 #include <linux/reset.h>
17 
18 #include <drm/drm_atomic_helper.h>
19 #include <drm/drm_edid.h>
20 #include <drm/drm_encoder.h>
21 #include <drm/drm_of.h>
22 #include <drm/drm_panel.h>
23 #include <drm/drm_print.h>
24 #include <drm/drm_probe_helper.h>
25 #include <drm/drm_simple_kms_helper.h>
26 
27 #include "sun4i_backend.h"
28 #include "sun4i_crtc.h"
29 #include "sun4i_drv.h"
30 #include "sun4i_hdmi.h"
31 
32 static inline struct sun4i_hdmi *
drm_encoder_to_sun4i_hdmi(struct drm_encoder * encoder)33 drm_encoder_to_sun4i_hdmi(struct drm_encoder *encoder)
34 {
35 	return container_of(encoder, struct sun4i_hdmi,
36 			    encoder);
37 }
38 
39 static inline struct sun4i_hdmi *
drm_connector_to_sun4i_hdmi(struct drm_connector * connector)40 drm_connector_to_sun4i_hdmi(struct drm_connector *connector)
41 {
42 	return container_of(connector, struct sun4i_hdmi,
43 			    connector);
44 }
45 
sun4i_hdmi_setup_avi_infoframes(struct sun4i_hdmi * hdmi,struct drm_display_mode * mode)46 static int sun4i_hdmi_setup_avi_infoframes(struct sun4i_hdmi *hdmi,
47 					   struct drm_display_mode *mode)
48 {
49 	struct hdmi_avi_infoframe frame;
50 	u8 buffer[17];
51 	int i, ret;
52 
53 	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
54 						       &hdmi->connector, mode);
55 	if (ret < 0) {
56 		DRM_ERROR("Failed to get infoframes from mode\n");
57 		return ret;
58 	}
59 
60 	ret = hdmi_avi_infoframe_pack(&frame, buffer, sizeof(buffer));
61 	if (ret < 0) {
62 		DRM_ERROR("Failed to pack infoframes\n");
63 		return ret;
64 	}
65 
66 	for (i = 0; i < sizeof(buffer); i++)
67 		writeb(buffer[i], hdmi->base + SUN4I_HDMI_AVI_INFOFRAME_REG(i));
68 
69 	return 0;
70 }
71 
sun4i_hdmi_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)72 static int sun4i_hdmi_atomic_check(struct drm_encoder *encoder,
73 				   struct drm_crtc_state *crtc_state,
74 				   struct drm_connector_state *conn_state)
75 {
76 	struct drm_display_mode *mode = &crtc_state->mode;
77 
78 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
79 		return -EINVAL;
80 
81 	return 0;
82 }
83 
sun4i_hdmi_disable(struct drm_encoder * encoder)84 static void sun4i_hdmi_disable(struct drm_encoder *encoder)
85 {
86 	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
87 	u32 val;
88 
89 	DRM_DEBUG_DRIVER("Disabling the HDMI Output\n");
90 
91 	val = readl(hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
92 	val &= ~SUN4I_HDMI_VID_CTRL_ENABLE;
93 	writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
94 
95 	clk_disable_unprepare(hdmi->tmds_clk);
96 }
97 
sun4i_hdmi_enable(struct drm_encoder * encoder)98 static void sun4i_hdmi_enable(struct drm_encoder *encoder)
99 {
100 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
101 	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
102 	u32 val = 0;
103 
104 	DRM_DEBUG_DRIVER("Enabling the HDMI Output\n");
105 
106 	clk_prepare_enable(hdmi->tmds_clk);
107 
108 	sun4i_hdmi_setup_avi_infoframes(hdmi, mode);
109 	val |= SUN4I_HDMI_PKT_CTRL_TYPE(0, SUN4I_HDMI_PKT_AVI);
110 	val |= SUN4I_HDMI_PKT_CTRL_TYPE(1, SUN4I_HDMI_PKT_END);
111 	writel(val, hdmi->base + SUN4I_HDMI_PKT_CTRL_REG(0));
112 
113 	val = SUN4I_HDMI_VID_CTRL_ENABLE;
114 	if (hdmi->hdmi_monitor)
115 		val |= SUN4I_HDMI_VID_CTRL_HDMI_MODE;
116 
117 	writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
118 }
119 
sun4i_hdmi_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)120 static void sun4i_hdmi_mode_set(struct drm_encoder *encoder,
121 				struct drm_display_mode *mode,
122 				struct drm_display_mode *adjusted_mode)
123 {
124 	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
125 	unsigned int x, y;
126 	u32 val;
127 
128 	clk_set_rate(hdmi->mod_clk, mode->crtc_clock * 1000);
129 	clk_set_rate(hdmi->tmds_clk, mode->crtc_clock * 1000);
130 
131 	/* Set input sync enable */
132 	writel(SUN4I_HDMI_UNKNOWN_INPUT_SYNC,
133 	       hdmi->base + SUN4I_HDMI_UNKNOWN_REG);
134 
135 	/*
136 	 * Setup output pad (?) controls
137 	 *
138 	 * This is done here instead of at probe/bind time because
139 	 * the controller seems to toggle some of the bits on its own.
140 	 *
141 	 * We can't just initialize the register there, we need to
142 	 * protect the clock bits that have already been read out and
143 	 * cached by the clock framework.
144 	 */
145 	val = readl(hdmi->base + SUN4I_HDMI_PAD_CTRL1_REG);
146 	val &= SUN4I_HDMI_PAD_CTRL1_HALVE_CLK;
147 	val |= hdmi->variant->pad_ctrl1_init_val;
148 	writel(val, hdmi->base + SUN4I_HDMI_PAD_CTRL1_REG);
149 	val = readl(hdmi->base + SUN4I_HDMI_PAD_CTRL1_REG);
150 
151 	/* Setup timing registers */
152 	writel(SUN4I_HDMI_VID_TIMING_X(mode->hdisplay) |
153 	       SUN4I_HDMI_VID_TIMING_Y(mode->vdisplay),
154 	       hdmi->base + SUN4I_HDMI_VID_TIMING_ACT_REG);
155 
156 	x = mode->htotal - mode->hsync_start;
157 	y = mode->vtotal - mode->vsync_start;
158 	writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
159 	       hdmi->base + SUN4I_HDMI_VID_TIMING_BP_REG);
160 
161 	x = mode->hsync_start - mode->hdisplay;
162 	y = mode->vsync_start - mode->vdisplay;
163 	writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
164 	       hdmi->base + SUN4I_HDMI_VID_TIMING_FP_REG);
165 
166 	x = mode->hsync_end - mode->hsync_start;
167 	y = mode->vsync_end - mode->vsync_start;
168 	writel(SUN4I_HDMI_VID_TIMING_X(x) | SUN4I_HDMI_VID_TIMING_Y(y),
169 	       hdmi->base + SUN4I_HDMI_VID_TIMING_SPW_REG);
170 
171 	val = SUN4I_HDMI_VID_TIMING_POL_TX_CLK;
172 	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
173 		val |= SUN4I_HDMI_VID_TIMING_POL_HSYNC;
174 
175 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
176 		val |= SUN4I_HDMI_VID_TIMING_POL_VSYNC;
177 
178 	writel(val, hdmi->base + SUN4I_HDMI_VID_TIMING_POL_REG);
179 }
180 
sun4i_hdmi_mode_valid(struct drm_encoder * encoder,const struct drm_display_mode * mode)181 static enum drm_mode_status sun4i_hdmi_mode_valid(struct drm_encoder *encoder,
182 					const struct drm_display_mode *mode)
183 {
184 	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
185 	unsigned long rate = mode->clock * 1000;
186 	unsigned long diff = rate / 200; /* +-0.5% allowed by HDMI spec */
187 	long rounded_rate;
188 
189 	/* 165 MHz is the typical max pixelclock frequency for HDMI <= 1.2 */
190 	if (rate > 165000000)
191 		return MODE_CLOCK_HIGH;
192 	rounded_rate = clk_round_rate(hdmi->tmds_clk, rate);
193 	if (rounded_rate > 0 &&
194 	    max_t(unsigned long, rounded_rate, rate) -
195 	    min_t(unsigned long, rounded_rate, rate) < diff)
196 		return MODE_OK;
197 	return MODE_NOCLOCK;
198 }
199 
200 static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
201 	.atomic_check	= sun4i_hdmi_atomic_check,
202 	.disable	= sun4i_hdmi_disable,
203 	.enable		= sun4i_hdmi_enable,
204 	.mode_set	= sun4i_hdmi_mode_set,
205 	.mode_valid	= sun4i_hdmi_mode_valid,
206 };
207 
sun4i_hdmi_get_modes(struct drm_connector * connector)208 static int sun4i_hdmi_get_modes(struct drm_connector *connector)
209 {
210 	struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
211 	struct edid *edid;
212 	int ret;
213 
214 	edid = drm_get_edid(connector, hdmi->ddc_i2c ?: hdmi->i2c);
215 	if (!edid)
216 		return 0;
217 
218 	hdmi->hdmi_monitor = drm_detect_hdmi_monitor(edid);
219 	DRM_DEBUG_DRIVER("Monitor is %s monitor\n",
220 			 hdmi->hdmi_monitor ? "an HDMI" : "a DVI");
221 
222 	drm_connector_update_edid_property(connector, edid);
223 	cec_s_phys_addr_from_edid(hdmi->cec_adap, edid);
224 	ret = drm_add_edid_modes(connector, edid);
225 	kfree(edid);
226 
227 	return ret;
228 }
229 
sun4i_hdmi_get_ddc(struct device * dev)230 static struct i2c_adapter *sun4i_hdmi_get_ddc(struct device *dev)
231 {
232 	struct device_node *phandle, *remote;
233 	struct i2c_adapter *ddc;
234 
235 	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
236 	if (!remote)
237 		return ERR_PTR(-EINVAL);
238 
239 	phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
240 	of_node_put(remote);
241 	if (!phandle)
242 		return ERR_PTR(-ENODEV);
243 
244 	ddc = of_get_i2c_adapter_by_node(phandle);
245 	of_node_put(phandle);
246 	if (!ddc)
247 		return ERR_PTR(-EPROBE_DEFER);
248 
249 	return ddc;
250 }
251 
252 static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
253 	.get_modes	= sun4i_hdmi_get_modes,
254 };
255 
256 static enum drm_connector_status
sun4i_hdmi_connector_detect(struct drm_connector * connector,bool force)257 sun4i_hdmi_connector_detect(struct drm_connector *connector, bool force)
258 {
259 	struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
260 	unsigned long reg;
261 
262 	reg = readl(hdmi->base + SUN4I_HDMI_HPD_REG);
263 	if (!(reg & SUN4I_HDMI_HPD_HIGH)) {
264 		cec_phys_addr_invalidate(hdmi->cec_adap);
265 		return connector_status_disconnected;
266 	}
267 
268 	return connector_status_connected;
269 }
270 
271 static const struct drm_connector_funcs sun4i_hdmi_connector_funcs = {
272 	.detect			= sun4i_hdmi_connector_detect,
273 	.fill_modes		= drm_helper_probe_single_connector_modes,
274 	.destroy		= drm_connector_cleanup,
275 	.reset			= drm_atomic_helper_connector_reset,
276 	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
277 	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
278 };
279 
280 #ifdef CONFIG_DRM_SUN4I_HDMI_CEC
sun4i_hdmi_cec_pin_read(struct cec_adapter * adap)281 static int sun4i_hdmi_cec_pin_read(struct cec_adapter *adap)
282 {
283 	struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
284 
285 	return readl(hdmi->base + SUN4I_HDMI_CEC) & SUN4I_HDMI_CEC_RX;
286 }
287 
sun4i_hdmi_cec_pin_low(struct cec_adapter * adap)288 static void sun4i_hdmi_cec_pin_low(struct cec_adapter *adap)
289 {
290 	struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
291 
292 	/* Start driving the CEC pin low */
293 	writel(SUN4I_HDMI_CEC_ENABLE, hdmi->base + SUN4I_HDMI_CEC);
294 }
295 
sun4i_hdmi_cec_pin_high(struct cec_adapter * adap)296 static void sun4i_hdmi_cec_pin_high(struct cec_adapter *adap)
297 {
298 	struct sun4i_hdmi *hdmi = cec_get_drvdata(adap);
299 
300 	/*
301 	 * Stop driving the CEC pin, the pull up will take over
302 	 * unless another CEC device is driving the pin low.
303 	 */
304 	writel(0, hdmi->base + SUN4I_HDMI_CEC);
305 }
306 
307 static const struct cec_pin_ops sun4i_hdmi_cec_pin_ops = {
308 	.read = sun4i_hdmi_cec_pin_read,
309 	.low = sun4i_hdmi_cec_pin_low,
310 	.high = sun4i_hdmi_cec_pin_high,
311 };
312 #endif
313 
314 #define SUN4I_HDMI_PAD_CTRL1_MASK	(GENMASK(24, 7) | GENMASK(5, 0))
315 #define SUN4I_HDMI_PLL_CTRL_MASK	(GENMASK(31, 8) | GENMASK(3, 0))
316 
317 /* Only difference from sun5i is AMP is 4 instead of 6 */
318 static const struct sun4i_hdmi_variant sun4i_variant = {
319 	.pad_ctrl0_init_val	= SUN4I_HDMI_PAD_CTRL0_TXEN |
320 				  SUN4I_HDMI_PAD_CTRL0_CKEN |
321 				  SUN4I_HDMI_PAD_CTRL0_PWENG |
322 				  SUN4I_HDMI_PAD_CTRL0_PWEND |
323 				  SUN4I_HDMI_PAD_CTRL0_PWENC |
324 				  SUN4I_HDMI_PAD_CTRL0_LDODEN |
325 				  SUN4I_HDMI_PAD_CTRL0_LDOCEN |
326 				  SUN4I_HDMI_PAD_CTRL0_BIASEN,
327 	.pad_ctrl1_init_val	= SUN4I_HDMI_PAD_CTRL1_REG_AMP(4) |
328 				  SUN4I_HDMI_PAD_CTRL1_REG_EMP(2) |
329 				  SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
330 				  SUN4I_HDMI_PAD_CTRL1_REG_DEN |
331 				  SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
332 				  SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
333 				  SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
334 				  SUN4I_HDMI_PAD_CTRL1_AMP_OPT,
335 	.pll_ctrl_init_val	= SUN4I_HDMI_PLL_CTRL_VCO_S(8) |
336 				  SUN4I_HDMI_PLL_CTRL_CS(7) |
337 				  SUN4I_HDMI_PLL_CTRL_CP_S(15) |
338 				  SUN4I_HDMI_PLL_CTRL_S(7) |
339 				  SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) |
340 				  SUN4I_HDMI_PLL_CTRL_SDIV2 |
341 				  SUN4I_HDMI_PLL_CTRL_LDO2_EN |
342 				  SUN4I_HDMI_PLL_CTRL_LDO1_EN |
343 				  SUN4I_HDMI_PLL_CTRL_HV_IS_33 |
344 				  SUN4I_HDMI_PLL_CTRL_BWS |
345 				  SUN4I_HDMI_PLL_CTRL_PLL_EN,
346 
347 	.ddc_clk_reg		= REG_FIELD(SUN4I_HDMI_DDC_CLK_REG, 0, 6),
348 	.ddc_clk_pre_divider	= 2,
349 	.ddc_clk_m_offset	= 1,
350 
351 	.field_ddc_en		= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 31, 31),
352 	.field_ddc_start	= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 30, 30),
353 	.field_ddc_reset	= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 0, 0),
354 	.field_ddc_addr_reg	= REG_FIELD(SUN4I_HDMI_DDC_ADDR_REG, 0, 31),
355 	.field_ddc_slave_addr	= REG_FIELD(SUN4I_HDMI_DDC_ADDR_REG, 0, 6),
356 	.field_ddc_int_status	= REG_FIELD(SUN4I_HDMI_DDC_INT_STATUS_REG, 0, 8),
357 	.field_ddc_fifo_clear	= REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 31, 31),
358 	.field_ddc_fifo_rx_thres = REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 4, 7),
359 	.field_ddc_fifo_tx_thres = REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 0, 3),
360 	.field_ddc_byte_count	= REG_FIELD(SUN4I_HDMI_DDC_BYTE_COUNT_REG, 0, 9),
361 	.field_ddc_cmd		= REG_FIELD(SUN4I_HDMI_DDC_CMD_REG, 0, 2),
362 	.field_ddc_sda_en	= REG_FIELD(SUN4I_HDMI_DDC_LINE_CTRL_REG, 9, 9),
363 	.field_ddc_sck_en	= REG_FIELD(SUN4I_HDMI_DDC_LINE_CTRL_REG, 8, 8),
364 
365 	.ddc_fifo_reg		= SUN4I_HDMI_DDC_FIFO_DATA_REG,
366 	.ddc_fifo_has_dir	= true,
367 };
368 
369 static const struct sun4i_hdmi_variant sun5i_variant = {
370 	.pad_ctrl0_init_val	= SUN4I_HDMI_PAD_CTRL0_TXEN |
371 				  SUN4I_HDMI_PAD_CTRL0_CKEN |
372 				  SUN4I_HDMI_PAD_CTRL0_PWENG |
373 				  SUN4I_HDMI_PAD_CTRL0_PWEND |
374 				  SUN4I_HDMI_PAD_CTRL0_PWENC |
375 				  SUN4I_HDMI_PAD_CTRL0_LDODEN |
376 				  SUN4I_HDMI_PAD_CTRL0_LDOCEN |
377 				  SUN4I_HDMI_PAD_CTRL0_BIASEN,
378 	.pad_ctrl1_init_val	= SUN4I_HDMI_PAD_CTRL1_REG_AMP(6) |
379 				  SUN4I_HDMI_PAD_CTRL1_REG_EMP(2) |
380 				  SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
381 				  SUN4I_HDMI_PAD_CTRL1_REG_DEN |
382 				  SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
383 				  SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
384 				  SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
385 				  SUN4I_HDMI_PAD_CTRL1_AMP_OPT,
386 	.pll_ctrl_init_val	= SUN4I_HDMI_PLL_CTRL_VCO_S(8) |
387 				  SUN4I_HDMI_PLL_CTRL_CS(7) |
388 				  SUN4I_HDMI_PLL_CTRL_CP_S(15) |
389 				  SUN4I_HDMI_PLL_CTRL_S(7) |
390 				  SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) |
391 				  SUN4I_HDMI_PLL_CTRL_SDIV2 |
392 				  SUN4I_HDMI_PLL_CTRL_LDO2_EN |
393 				  SUN4I_HDMI_PLL_CTRL_LDO1_EN |
394 				  SUN4I_HDMI_PLL_CTRL_HV_IS_33 |
395 				  SUN4I_HDMI_PLL_CTRL_BWS |
396 				  SUN4I_HDMI_PLL_CTRL_PLL_EN,
397 
398 	.ddc_clk_reg		= REG_FIELD(SUN4I_HDMI_DDC_CLK_REG, 0, 6),
399 	.ddc_clk_pre_divider	= 2,
400 	.ddc_clk_m_offset	= 1,
401 
402 	.field_ddc_en		= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 31, 31),
403 	.field_ddc_start	= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 30, 30),
404 	.field_ddc_reset	= REG_FIELD(SUN4I_HDMI_DDC_CTRL_REG, 0, 0),
405 	.field_ddc_addr_reg	= REG_FIELD(SUN4I_HDMI_DDC_ADDR_REG, 0, 31),
406 	.field_ddc_slave_addr	= REG_FIELD(SUN4I_HDMI_DDC_ADDR_REG, 0, 6),
407 	.field_ddc_int_status	= REG_FIELD(SUN4I_HDMI_DDC_INT_STATUS_REG, 0, 8),
408 	.field_ddc_fifo_clear	= REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 31, 31),
409 	.field_ddc_fifo_rx_thres = REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 4, 7),
410 	.field_ddc_fifo_tx_thres = REG_FIELD(SUN4I_HDMI_DDC_FIFO_CTRL_REG, 0, 3),
411 	.field_ddc_byte_count	= REG_FIELD(SUN4I_HDMI_DDC_BYTE_COUNT_REG, 0, 9),
412 	.field_ddc_cmd		= REG_FIELD(SUN4I_HDMI_DDC_CMD_REG, 0, 2),
413 	.field_ddc_sda_en	= REG_FIELD(SUN4I_HDMI_DDC_LINE_CTRL_REG, 9, 9),
414 	.field_ddc_sck_en	= REG_FIELD(SUN4I_HDMI_DDC_LINE_CTRL_REG, 8, 8),
415 
416 	.ddc_fifo_reg		= SUN4I_HDMI_DDC_FIFO_DATA_REG,
417 	.ddc_fifo_has_dir	= true,
418 };
419 
420 static const struct sun4i_hdmi_variant sun6i_variant = {
421 	.has_ddc_parent_clk	= true,
422 	.has_reset_control	= true,
423 	.pad_ctrl0_init_val	= 0xff |
424 				  SUN4I_HDMI_PAD_CTRL0_TXEN |
425 				  SUN4I_HDMI_PAD_CTRL0_CKEN |
426 				  SUN4I_HDMI_PAD_CTRL0_PWENG |
427 				  SUN4I_HDMI_PAD_CTRL0_PWEND |
428 				  SUN4I_HDMI_PAD_CTRL0_PWENC |
429 				  SUN4I_HDMI_PAD_CTRL0_LDODEN |
430 				  SUN4I_HDMI_PAD_CTRL0_LDOCEN,
431 	.pad_ctrl1_init_val	= SUN4I_HDMI_PAD_CTRL1_REG_AMP(6) |
432 				  SUN4I_HDMI_PAD_CTRL1_REG_EMP(4) |
433 				  SUN4I_HDMI_PAD_CTRL1_REG_DENCK |
434 				  SUN4I_HDMI_PAD_CTRL1_REG_DEN |
435 				  SUN4I_HDMI_PAD_CTRL1_EMPCK_OPT |
436 				  SUN4I_HDMI_PAD_CTRL1_EMP_OPT |
437 				  SUN4I_HDMI_PAD_CTRL1_PWSDT |
438 				  SUN4I_HDMI_PAD_CTRL1_PWSCK |
439 				  SUN4I_HDMI_PAD_CTRL1_AMPCK_OPT |
440 				  SUN4I_HDMI_PAD_CTRL1_AMP_OPT |
441 				  SUN4I_HDMI_PAD_CTRL1_UNKNOWN,
442 	.pll_ctrl_init_val	= SUN4I_HDMI_PLL_CTRL_VCO_S(8) |
443 				  SUN4I_HDMI_PLL_CTRL_CS(3) |
444 				  SUN4I_HDMI_PLL_CTRL_CP_S(10) |
445 				  SUN4I_HDMI_PLL_CTRL_S(4) |
446 				  SUN4I_HDMI_PLL_CTRL_VCO_GAIN(4) |
447 				  SUN4I_HDMI_PLL_CTRL_SDIV2 |
448 				  SUN4I_HDMI_PLL_CTRL_LDO2_EN |
449 				  SUN4I_HDMI_PLL_CTRL_LDO1_EN |
450 				  SUN4I_HDMI_PLL_CTRL_HV_IS_33 |
451 				  SUN4I_HDMI_PLL_CTRL_PLL_EN,
452 
453 	.ddc_clk_reg		= REG_FIELD(SUN6I_HDMI_DDC_CLK_REG, 0, 6),
454 	.ddc_clk_pre_divider	= 1,
455 	.ddc_clk_m_offset	= 2,
456 
457 	.tmds_clk_div_offset	= 1,
458 
459 	.field_ddc_en		= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 0, 0),
460 	.field_ddc_start	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 27, 27),
461 	.field_ddc_reset	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 31, 31),
462 	.field_ddc_addr_reg	= REG_FIELD(SUN6I_HDMI_DDC_ADDR_REG, 1, 31),
463 	.field_ddc_slave_addr	= REG_FIELD(SUN6I_HDMI_DDC_ADDR_REG, 1, 7),
464 	.field_ddc_int_status	= REG_FIELD(SUN6I_HDMI_DDC_INT_STATUS_REG, 0, 8),
465 	.field_ddc_fifo_clear	= REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 18, 18),
466 	.field_ddc_fifo_rx_thres = REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 4, 7),
467 	.field_ddc_fifo_tx_thres = REG_FIELD(SUN6I_HDMI_DDC_FIFO_CTRL_REG, 0, 3),
468 	.field_ddc_byte_count	= REG_FIELD(SUN6I_HDMI_DDC_CMD_REG, 16, 25),
469 	.field_ddc_cmd		= REG_FIELD(SUN6I_HDMI_DDC_CMD_REG, 0, 2),
470 	.field_ddc_sda_en	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 6, 6),
471 	.field_ddc_sck_en	= REG_FIELD(SUN6I_HDMI_DDC_CTRL_REG, 4, 4),
472 
473 	.ddc_fifo_reg		= SUN6I_HDMI_DDC_FIFO_DATA_REG,
474 	.ddc_fifo_thres_incl	= true,
475 };
476 
477 static const struct regmap_config sun4i_hdmi_regmap_config = {
478 	.reg_bits	= 32,
479 	.val_bits	= 32,
480 	.reg_stride	= 4,
481 	.max_register	= 0x580,
482 };
483 
sun4i_hdmi_bind(struct device * dev,struct device * master,void * data)484 static int sun4i_hdmi_bind(struct device *dev, struct device *master,
485 			   void *data)
486 {
487 	struct platform_device *pdev = to_platform_device(dev);
488 	struct drm_device *drm = data;
489 	struct cec_connector_info conn_info;
490 	struct sun4i_drv *drv = drm->dev_private;
491 	struct sun4i_hdmi *hdmi;
492 	struct resource *res;
493 	u32 reg;
494 	int ret;
495 
496 	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
497 	if (!hdmi)
498 		return -ENOMEM;
499 	dev_set_drvdata(dev, hdmi);
500 	hdmi->dev = dev;
501 	hdmi->drv = drv;
502 
503 	hdmi->variant = of_device_get_match_data(dev);
504 	if (!hdmi->variant)
505 		return -EINVAL;
506 
507 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
508 	hdmi->base = devm_ioremap_resource(dev, res);
509 	if (IS_ERR(hdmi->base)) {
510 		dev_err(dev, "Couldn't map the HDMI encoder registers\n");
511 		return PTR_ERR(hdmi->base);
512 	}
513 
514 	if (hdmi->variant->has_reset_control) {
515 		hdmi->reset = devm_reset_control_get(dev, NULL);
516 		if (IS_ERR(hdmi->reset)) {
517 			dev_err(dev, "Couldn't get the HDMI reset control\n");
518 			return PTR_ERR(hdmi->reset);
519 		}
520 
521 		ret = reset_control_deassert(hdmi->reset);
522 		if (ret) {
523 			dev_err(dev, "Couldn't deassert HDMI reset\n");
524 			return ret;
525 		}
526 	}
527 
528 	hdmi->bus_clk = devm_clk_get(dev, "ahb");
529 	if (IS_ERR(hdmi->bus_clk)) {
530 		dev_err(dev, "Couldn't get the HDMI bus clock\n");
531 		ret = PTR_ERR(hdmi->bus_clk);
532 		goto err_assert_reset;
533 	}
534 	clk_prepare_enable(hdmi->bus_clk);
535 
536 	hdmi->mod_clk = devm_clk_get(dev, "mod");
537 	if (IS_ERR(hdmi->mod_clk)) {
538 		dev_err(dev, "Couldn't get the HDMI mod clock\n");
539 		ret = PTR_ERR(hdmi->mod_clk);
540 		goto err_disable_bus_clk;
541 	}
542 	clk_prepare_enable(hdmi->mod_clk);
543 
544 	hdmi->pll0_clk = devm_clk_get(dev, "pll-0");
545 	if (IS_ERR(hdmi->pll0_clk)) {
546 		dev_err(dev, "Couldn't get the HDMI PLL 0 clock\n");
547 		ret = PTR_ERR(hdmi->pll0_clk);
548 		goto err_disable_mod_clk;
549 	}
550 
551 	hdmi->pll1_clk = devm_clk_get(dev, "pll-1");
552 	if (IS_ERR(hdmi->pll1_clk)) {
553 		dev_err(dev, "Couldn't get the HDMI PLL 1 clock\n");
554 		ret = PTR_ERR(hdmi->pll1_clk);
555 		goto err_disable_mod_clk;
556 	}
557 
558 	hdmi->regmap = devm_regmap_init_mmio(dev, hdmi->base,
559 					     &sun4i_hdmi_regmap_config);
560 	if (IS_ERR(hdmi->regmap)) {
561 		dev_err(dev, "Couldn't create HDMI encoder regmap\n");
562 		ret = PTR_ERR(hdmi->regmap);
563 		goto err_disable_mod_clk;
564 	}
565 
566 	ret = sun4i_tmds_create(hdmi);
567 	if (ret) {
568 		dev_err(dev, "Couldn't create the TMDS clock\n");
569 		goto err_disable_mod_clk;
570 	}
571 
572 	if (hdmi->variant->has_ddc_parent_clk) {
573 		hdmi->ddc_parent_clk = devm_clk_get(dev, "ddc");
574 		if (IS_ERR(hdmi->ddc_parent_clk)) {
575 			dev_err(dev, "Couldn't get the HDMI DDC clock\n");
576 			ret = PTR_ERR(hdmi->ddc_parent_clk);
577 			goto err_disable_mod_clk;
578 		}
579 	} else {
580 		hdmi->ddc_parent_clk = hdmi->tmds_clk;
581 	}
582 
583 	writel(SUN4I_HDMI_CTRL_ENABLE, hdmi->base + SUN4I_HDMI_CTRL_REG);
584 
585 	writel(hdmi->variant->pad_ctrl0_init_val,
586 	       hdmi->base + SUN4I_HDMI_PAD_CTRL0_REG);
587 
588 	reg = readl(hdmi->base + SUN4I_HDMI_PLL_CTRL_REG);
589 	reg &= SUN4I_HDMI_PLL_CTRL_DIV_MASK;
590 	reg |= hdmi->variant->pll_ctrl_init_val;
591 	writel(reg, hdmi->base + SUN4I_HDMI_PLL_CTRL_REG);
592 
593 	ret = sun4i_hdmi_i2c_create(dev, hdmi);
594 	if (ret) {
595 		dev_err(dev, "Couldn't create the HDMI I2C adapter\n");
596 		goto err_disable_mod_clk;
597 	}
598 
599 	hdmi->ddc_i2c = sun4i_hdmi_get_ddc(dev);
600 	if (IS_ERR(hdmi->ddc_i2c)) {
601 		ret = PTR_ERR(hdmi->ddc_i2c);
602 		if (ret == -ENODEV)
603 			hdmi->ddc_i2c = NULL;
604 		else
605 			goto err_del_i2c_adapter;
606 	}
607 
608 	drm_encoder_helper_add(&hdmi->encoder,
609 			       &sun4i_hdmi_helper_funcs);
610 	ret = drm_simple_encoder_init(drm, &hdmi->encoder,
611 				      DRM_MODE_ENCODER_TMDS);
612 	if (ret) {
613 		dev_err(dev, "Couldn't initialise the HDMI encoder\n");
614 		goto err_put_ddc_i2c;
615 	}
616 
617 	hdmi->encoder.possible_crtcs = drm_of_find_possible_crtcs(drm,
618 								  dev->of_node);
619 	if (!hdmi->encoder.possible_crtcs) {
620 		ret = -EPROBE_DEFER;
621 		goto err_put_ddc_i2c;
622 	}
623 
624 #ifdef CONFIG_DRM_SUN4I_HDMI_CEC
625 	hdmi->cec_adap = cec_pin_allocate_adapter(&sun4i_hdmi_cec_pin_ops,
626 		hdmi, "sun4i", CEC_CAP_DEFAULTS | CEC_CAP_CONNECTOR_INFO);
627 	ret = PTR_ERR_OR_ZERO(hdmi->cec_adap);
628 	if (ret < 0)
629 		goto err_cleanup_connector;
630 	writel(readl(hdmi->base + SUN4I_HDMI_CEC) & ~SUN4I_HDMI_CEC_TX,
631 	       hdmi->base + SUN4I_HDMI_CEC);
632 #endif
633 
634 	drm_connector_helper_add(&hdmi->connector,
635 				 &sun4i_hdmi_connector_helper_funcs);
636 	ret = drm_connector_init_with_ddc(drm, &hdmi->connector,
637 					  &sun4i_hdmi_connector_funcs,
638 					  DRM_MODE_CONNECTOR_HDMIA,
639 					  hdmi->ddc_i2c);
640 	if (ret) {
641 		dev_err(dev,
642 			"Couldn't initialise the HDMI connector\n");
643 		goto err_cleanup_connector;
644 	}
645 	cec_fill_conn_info_from_drm(&conn_info, &hdmi->connector);
646 	cec_s_conn_info(hdmi->cec_adap, &conn_info);
647 
648 	/* There is no HPD interrupt, so we need to poll the controller */
649 	hdmi->connector.polled = DRM_CONNECTOR_POLL_CONNECT |
650 		DRM_CONNECTOR_POLL_DISCONNECT;
651 
652 	ret = cec_register_adapter(hdmi->cec_adap, dev);
653 	if (ret < 0)
654 		goto err_cleanup_connector;
655 	drm_connector_attach_encoder(&hdmi->connector, &hdmi->encoder);
656 
657 	return 0;
658 
659 err_cleanup_connector:
660 	cec_delete_adapter(hdmi->cec_adap);
661 	drm_encoder_cleanup(&hdmi->encoder);
662 err_put_ddc_i2c:
663 	i2c_put_adapter(hdmi->ddc_i2c);
664 err_del_i2c_adapter:
665 	i2c_del_adapter(hdmi->i2c);
666 err_disable_mod_clk:
667 	clk_disable_unprepare(hdmi->mod_clk);
668 err_disable_bus_clk:
669 	clk_disable_unprepare(hdmi->bus_clk);
670 err_assert_reset:
671 	reset_control_assert(hdmi->reset);
672 	return ret;
673 }
674 
sun4i_hdmi_unbind(struct device * dev,struct device * master,void * data)675 static void sun4i_hdmi_unbind(struct device *dev, struct device *master,
676 			    void *data)
677 {
678 	struct sun4i_hdmi *hdmi = dev_get_drvdata(dev);
679 
680 	cec_unregister_adapter(hdmi->cec_adap);
681 	i2c_del_adapter(hdmi->i2c);
682 	i2c_put_adapter(hdmi->ddc_i2c);
683 	clk_disable_unprepare(hdmi->mod_clk);
684 	clk_disable_unprepare(hdmi->bus_clk);
685 }
686 
687 static const struct component_ops sun4i_hdmi_ops = {
688 	.bind	= sun4i_hdmi_bind,
689 	.unbind	= sun4i_hdmi_unbind,
690 };
691 
sun4i_hdmi_probe(struct platform_device * pdev)692 static int sun4i_hdmi_probe(struct platform_device *pdev)
693 {
694 	return component_add(&pdev->dev, &sun4i_hdmi_ops);
695 }
696 
sun4i_hdmi_remove(struct platform_device * pdev)697 static int sun4i_hdmi_remove(struct platform_device *pdev)
698 {
699 	component_del(&pdev->dev, &sun4i_hdmi_ops);
700 
701 	return 0;
702 }
703 
704 static const struct of_device_id sun4i_hdmi_of_table[] = {
705 	{ .compatible = "allwinner,sun4i-a10-hdmi", .data = &sun4i_variant, },
706 	{ .compatible = "allwinner,sun5i-a10s-hdmi", .data = &sun5i_variant, },
707 	{ .compatible = "allwinner,sun6i-a31-hdmi", .data = &sun6i_variant, },
708 	{ }
709 };
710 MODULE_DEVICE_TABLE(of, sun4i_hdmi_of_table);
711 
712 static struct platform_driver sun4i_hdmi_driver = {
713 	.probe		= sun4i_hdmi_probe,
714 	.remove		= sun4i_hdmi_remove,
715 	.driver		= {
716 		.name		= "sun4i-hdmi",
717 		.of_match_table	= sun4i_hdmi_of_table,
718 	},
719 };
720 module_platform_driver(sun4i_hdmi_driver);
721 
722 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
723 MODULE_DESCRIPTION("Allwinner A10 HDMI Driver");
724 MODULE_LICENSE("GPL");
725