2 * OMAP2plus display device setup / initialization.
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
5 * Senthilvadivu Guruswamy
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/string.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
23 #include <linux/clk.h>
24 #include <linux/err.h>
25 #include <linux/delay.h>
27 #include <linux/of_platform.h>
28 #include <linux/slab.h>
29 #include <linux/mfd/syscon.h>
30 #include <linux/regmap.h>
32 #include <linux/platform_data/omapdss.h>
33 #include "omap_hwmod.h"
34 #include "omap_device.h"
44 #define DISPC_CONTROL 0x0040
45 #define DISPC_CONTROL2 0x0238
46 #define DISPC_CONTROL3 0x0848
47 #define DISPC_IRQSTATUS 0x0018
49 #define DSS_CONTROL 0x40
50 #define DSS_SDI_CONTROL 0x44
51 #define DSS_PLL_CONTROL 0x48
53 #define LCD_EN_MASK (0x1 << 0)
54 #define DIGIT_EN_MASK (0x1 << 1)
56 #define FRAMEDONE_IRQ_SHIFT 0
57 #define EVSYNC_EVEN_IRQ_SHIFT 2
58 #define EVSYNC_ODD_IRQ_SHIFT 3
59 #define FRAMEDONE2_IRQ_SHIFT 22
60 #define FRAMEDONE3_IRQ_SHIFT 30
61 #define FRAMEDONETV_IRQ_SHIFT 24
64 * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC
65 * reset before deciding that something has gone wrong
67 #define FRAMEDONE_IRQ_TIMEOUT 100
69 #if defined(CONFIG_FB_OMAP2)
70 static struct platform_device omap_display_device = {
74 .platform_data = NULL,
78 #define OMAP4_DSIPHY_SYSCON_OFFSET 0x78
80 static struct regmap *omap4_dsi_mux_syscon;
82 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
84 u32 enable_mask, enable_shift;
85 u32 pipd_mask, pipd_shift;
89 enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
90 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
91 pipd_mask = OMAP4_DSI1_PIPD_MASK;
92 pipd_shift = OMAP4_DSI1_PIPD_SHIFT;
93 } else if (dsi_id == 1) {
94 enable_mask = OMAP4_DSI2_LANEENABLE_MASK;
95 enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT;
96 pipd_mask = OMAP4_DSI2_PIPD_MASK;
97 pipd_shift = OMAP4_DSI2_PIPD_SHIFT;
102 regmap_read(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, ®);
107 reg |= (lanes << enable_shift) & enable_mask;
108 reg |= (lanes << pipd_shift) & pipd_mask;
110 regmap_write(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, reg);
115 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask)
117 if (cpu_is_omap44xx())
118 return omap4_dsi_mux_pads(dsi_id, lane_mask);
123 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask)
125 if (cpu_is_omap44xx())
126 omap4_dsi_mux_pads(dsi_id, 0);
129 static int omap_dss_set_min_bus_tput(struct device *dev, unsigned long tput)
131 return omap_pm_set_min_bus_tput(dev, OCP_INITIATOR_AGENT, tput);
134 static enum omapdss_version __init omap_display_get_version(void)
136 if (cpu_is_omap24xx())
137 return OMAPDSS_VER_OMAP24xx;
138 else if (cpu_is_omap3630())
139 return OMAPDSS_VER_OMAP3630;
140 else if (cpu_is_omap34xx()) {
141 if (soc_is_am35xx()) {
142 return OMAPDSS_VER_AM35xx;
144 if (omap_rev() < OMAP3430_REV_ES3_0)
145 return OMAPDSS_VER_OMAP34xx_ES1;
147 return OMAPDSS_VER_OMAP34xx_ES3;
149 } else if (omap_rev() == OMAP4430_REV_ES1_0)
150 return OMAPDSS_VER_OMAP4430_ES1;
151 else if (omap_rev() == OMAP4430_REV_ES2_0 ||
152 omap_rev() == OMAP4430_REV_ES2_1 ||
153 omap_rev() == OMAP4430_REV_ES2_2)
154 return OMAPDSS_VER_OMAP4430_ES2;
155 else if (cpu_is_omap44xx())
156 return OMAPDSS_VER_OMAP4;
157 else if (soc_is_omap54xx())
158 return OMAPDSS_VER_OMAP5;
159 else if (soc_is_am43xx())
160 return OMAPDSS_VER_AM43xx;
161 else if (soc_is_dra7xx())
162 return OMAPDSS_VER_DRA7xx;
164 return OMAPDSS_VER_UNKNOWN;
167 static int __init omapdss_init_fbdev(void)
169 static struct omap_dss_board_info board_data = {
170 .dsi_enable_pads = omap_dsi_enable_pads,
171 .dsi_disable_pads = omap_dsi_disable_pads,
172 .set_min_bus_tput = omap_dss_set_min_bus_tput,
174 struct device_node *node;
177 board_data.version = omap_display_get_version();
178 if (board_data.version == OMAPDSS_VER_UNKNOWN) {
179 pr_err("DSS not supported on this SoC\n");
183 omap_display_device.dev.platform_data = &board_data;
185 r = platform_device_register(&omap_display_device);
187 pr_err("Unable to register omapdss device\n");
191 /* create vrfb device */
192 r = omap_init_vrfb();
194 pr_err("Unable to register omapvrfb device\n");
198 /* create FB device */
201 pr_err("Unable to register omapfb device\n");
205 /* create V4L2 display device */
206 r = omap_init_vout();
208 pr_err("Unable to register omap_vout device\n");
212 /* add DSI info for omap4 */
213 node = of_find_node_by_name(NULL, "omap4_padconf_global");
215 omap4_dsi_mux_syscon = syscon_node_to_regmap(node);
220 static inline int omapdss_init_fbdev(void)
224 #endif /* CONFIG_FB_OMAP2 */
226 static void dispc_disable_outputs(void)
229 bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false;
231 struct omap_dss_dispc_dev_attr *da;
232 struct omap_hwmod *oh;
234 oh = omap_hwmod_lookup("dss_dispc");
236 WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n");
241 pr_err("display: could not disable outputs during reset due to missing dev_attr\n");
245 da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr;
247 /* store value of LCDENABLE and DIGITENABLE bits */
248 v = omap_hwmod_read(oh, DISPC_CONTROL);
249 lcd_en = v & LCD_EN_MASK;
250 digit_en = v & DIGIT_EN_MASK;
252 /* store value of LCDENABLE for LCD2 */
253 if (da->manager_count > 2) {
254 v = omap_hwmod_read(oh, DISPC_CONTROL2);
255 lcd2_en = v & LCD_EN_MASK;
258 /* store value of LCDENABLE for LCD3 */
259 if (da->manager_count > 3) {
260 v = omap_hwmod_read(oh, DISPC_CONTROL3);
261 lcd3_en = v & LCD_EN_MASK;
264 if (!(lcd_en | digit_en | lcd2_en | lcd3_en))
265 return; /* no managers currently enabled */
268 * If any manager was enabled, we need to disable it before
269 * DSS clocks are disabled or DISPC module is reset
272 irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT;
275 if (da->has_framedonetv_irq) {
276 irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT;
278 irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT |
279 1 << EVSYNC_ODD_IRQ_SHIFT;
284 irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT;
286 irq_mask |= 1 << FRAMEDONE3_IRQ_SHIFT;
289 * clear any previous FRAMEDONE, FRAMEDONETV,
290 * EVSYNC_EVEN/ODD, FRAMEDONE2 or FRAMEDONE3 interrupts
292 omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS);
294 /* disable LCD and TV managers */
295 v = omap_hwmod_read(oh, DISPC_CONTROL);
296 v &= ~(LCD_EN_MASK | DIGIT_EN_MASK);
297 omap_hwmod_write(v, oh, DISPC_CONTROL);
299 /* disable LCD2 manager */
300 if (da->manager_count > 2) {
301 v = omap_hwmod_read(oh, DISPC_CONTROL2);
303 omap_hwmod_write(v, oh, DISPC_CONTROL2);
306 /* disable LCD3 manager */
307 if (da->manager_count > 3) {
308 v = omap_hwmod_read(oh, DISPC_CONTROL3);
310 omap_hwmod_write(v, oh, DISPC_CONTROL3);
314 while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) !=
317 if (i > FRAMEDONE_IRQ_TIMEOUT) {
318 pr_err("didn't get FRAMEDONE1/2/3 or TV interrupt\n");
325 int omap_dss_reset(struct omap_hwmod *oh)
327 struct omap_hwmod_opt_clk *oc;
331 if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
332 pr_err("dss_core: hwmod data doesn't contain reset data\n");
336 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
338 clk_prepare_enable(oc->_clk);
340 dispc_disable_outputs();
342 /* clear SDI registers */
343 if (cpu_is_omap3430()) {
344 omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL);
345 omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL);
349 * clear DSS_CONTROL register to switch DSS clock sources to
352 omap_hwmod_write(0x0, oh, DSS_CONTROL);
354 omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
355 & SYSS_RESETDONE_MASK),
356 MAX_MODULE_SOFTRESET_WAIT, c);
358 if (c == MAX_MODULE_SOFTRESET_WAIT)
359 pr_warn("dss_core: waiting for reset to finish failed\n");
361 pr_debug("dss_core: softreset done\n");
363 for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
365 clk_disable_unprepare(oc->_clk);
367 r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
372 static const char * const omapdss_compat_names[] __initconst = {
380 static struct device_node * __init omapdss_find_dss_of_node(void)
382 struct device_node *node;
385 for (i = 0; i < ARRAY_SIZE(omapdss_compat_names); ++i) {
386 node = of_find_compatible_node(NULL, NULL,
387 omapdss_compat_names[i]);
395 int __init omapdss_init_of(void)
398 struct device_node *node;
399 struct platform_device *pdev;
401 /* only create dss helper devices if dss is enabled in the .dts */
403 node = omapdss_find_dss_of_node();
407 if (!of_device_is_available(node))
410 pdev = of_find_device_by_node(node);
413 pr_err("Unable to find DSS platform device\n");
417 r = of_platform_populate(node, NULL, NULL, &pdev->dev);
419 pr_err("Unable to populate DSS submodule devices\n");
423 return omapdss_init_fbdev();