2 * linux/drivers/video/omap2/dss/dss.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7 * Some code and ideas taken from drivers/video/omap/ driver
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along with
20 * this program. If not, see <http://www.gnu.org/licenses/>.
23 #define DSS_SUBSYS_NAME "DSS"
25 #include <linux/kernel.h>
27 #include <linux/err.h>
28 #include <linux/delay.h>
29 #include <linux/seq_file.h>
30 #include <linux/clk.h>
32 #include <plat/display.h>
33 #include <plat/clock.h>
35 #include "dss_features.h"
37 #define DSS_SZ_REGS SZ_512
43 #define DSS_REG(idx) ((const struct dss_reg) { idx })
45 #define DSS_REVISION DSS_REG(0x0000)
46 #define DSS_SYSCONFIG DSS_REG(0x0010)
47 #define DSS_SYSSTATUS DSS_REG(0x0014)
48 #define DSS_IRQSTATUS DSS_REG(0x0018)
49 #define DSS_CONTROL DSS_REG(0x0040)
50 #define DSS_SDI_CONTROL DSS_REG(0x0044)
51 #define DSS_PLL_CONTROL DSS_REG(0x0048)
52 #define DSS_SDI_STATUS DSS_REG(0x005C)
54 #define REG_GET(idx, start, end) \
55 FLD_GET(dss_read_reg(idx), start, end)
57 #define REG_FLD_MOD(idx, val, start, end) \
58 dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
61 struct platform_device *pdev;
65 struct clk *dpll4_m4_ck;
68 struct clk *dss_sys_clk;
69 struct clk *dss_tv_fck;
70 struct clk *dss_video_fck;
71 unsigned num_clks_enabled;
73 unsigned long cache_req_pck;
74 unsigned long cache_prate;
75 struct dss_clock_info cache_dss_cinfo;
76 struct dispc_clock_info cache_dispc_cinfo;
78 enum dss_clk_source dsi_clk_source;
79 enum dss_clk_source dispc_clk_source;
80 enum dss_clk_source lcd_clk_source[MAX_DSS_LCD_MANAGERS];
82 u32 ctx[DSS_SZ_REGS / sizeof(u32)];
85 static const char * const dss_generic_clk_source_names[] = {
86 [DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC] = "DSI_PLL_HSDIV_DISPC",
87 [DSS_CLK_SRC_DSI_PLL_HSDIV_DSI] = "DSI_PLL_HSDIV_DSI",
88 [DSS_CLK_SRC_FCK] = "DSS_FCK",
91 static void dss_clk_enable_all_no_ctx(void);
92 static void dss_clk_disable_all_no_ctx(void);
93 static void dss_clk_enable_no_ctx(enum dss_clock clks);
94 static void dss_clk_disable_no_ctx(enum dss_clock clks);
96 static int _omap_dss_wait_reset(void);
98 static inline void dss_write_reg(const struct dss_reg idx, u32 val)
100 __raw_writel(val, dss.base + idx.idx);
103 static inline u32 dss_read_reg(const struct dss_reg idx)
105 return __raw_readl(dss.base + idx.idx);
109 dss.ctx[(DSS_##reg).idx / sizeof(u32)] = dss_read_reg(DSS_##reg)
111 dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
113 void dss_save_context(void)
115 if (cpu_is_omap24xx())
121 if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
122 OMAP_DISPLAY_TYPE_SDI) {
128 void dss_restore_context(void)
130 if (_omap_dss_wait_reset())
131 DSSERR("DSS not coming out of reset after sleep\n");
136 if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
137 OMAP_DISPLAY_TYPE_SDI) {
146 void dss_sdi_init(u8 datapairs)
150 BUG_ON(datapairs > 3 || datapairs < 1);
152 l = dss_read_reg(DSS_SDI_CONTROL);
153 l = FLD_MOD(l, 0xf, 19, 15); /* SDI_PDIV */
154 l = FLD_MOD(l, datapairs-1, 3, 2); /* SDI_PRSEL */
155 l = FLD_MOD(l, 2, 1, 0); /* SDI_BWSEL */
156 dss_write_reg(DSS_SDI_CONTROL, l);
158 l = dss_read_reg(DSS_PLL_CONTROL);
159 l = FLD_MOD(l, 0x7, 25, 22); /* SDI_PLL_FREQSEL */
160 l = FLD_MOD(l, 0xb, 16, 11); /* SDI_PLL_REGN */
161 l = FLD_MOD(l, 0xb4, 10, 1); /* SDI_PLL_REGM */
162 dss_write_reg(DSS_PLL_CONTROL, l);
165 int dss_sdi_enable(void)
167 unsigned long timeout;
169 dispc_pck_free_enable(1);
172 REG_FLD_MOD(DSS_PLL_CONTROL, 1, 18, 18); /* SDI_PLL_SYSRESET */
173 udelay(1); /* wait 2x PCLK */
176 REG_FLD_MOD(DSS_PLL_CONTROL, 1, 28, 28); /* SDI_PLL_GOBIT */
178 /* Waiting for PLL lock request to complete */
179 timeout = jiffies + msecs_to_jiffies(500);
180 while (dss_read_reg(DSS_SDI_STATUS) & (1 << 6)) {
181 if (time_after_eq(jiffies, timeout)) {
182 DSSERR("PLL lock request timed out\n");
187 /* Clearing PLL_GO bit */
188 REG_FLD_MOD(DSS_PLL_CONTROL, 0, 28, 28);
190 /* Waiting for PLL to lock */
191 timeout = jiffies + msecs_to_jiffies(500);
192 while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 5))) {
193 if (time_after_eq(jiffies, timeout)) {
194 DSSERR("PLL lock timed out\n");
199 dispc_lcd_enable_signal(1);
201 /* Waiting for SDI reset to complete */
202 timeout = jiffies + msecs_to_jiffies(500);
203 while (!(dss_read_reg(DSS_SDI_STATUS) & (1 << 2))) {
204 if (time_after_eq(jiffies, timeout)) {
205 DSSERR("SDI reset timed out\n");
213 dispc_lcd_enable_signal(0);
216 REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
218 dispc_pck_free_enable(0);
223 void dss_sdi_disable(void)
225 dispc_lcd_enable_signal(0);
227 dispc_pck_free_enable(0);
230 REG_FLD_MOD(DSS_PLL_CONTROL, 0, 18, 18); /* SDI_PLL_SYSRESET */
233 const char *dss_get_generic_clk_source_name(enum dss_clk_source clk_src)
235 return dss_generic_clk_source_names[clk_src];
238 void dss_dump_clocks(struct seq_file *s)
240 unsigned long dpll4_ck_rate;
241 unsigned long dpll4_m4_ck_rate;
242 const char *fclk_name, *fclk_real_name;
243 unsigned long fclk_rate;
245 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
247 seq_printf(s, "- DSS -\n");
249 fclk_name = dss_get_generic_clk_source_name(DSS_CLK_SRC_FCK);
250 fclk_real_name = dss_feat_get_clk_source_name(DSS_CLK_SRC_FCK);
251 fclk_rate = dss_clk_get_rate(DSS_CLK_FCK);
253 if (dss.dpll4_m4_ck) {
254 dpll4_ck_rate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
255 dpll4_m4_ck_rate = clk_get_rate(dss.dpll4_m4_ck);
257 seq_printf(s, "dpll4_ck %lu\n", dpll4_ck_rate);
259 if (cpu_is_omap3630() || cpu_is_omap44xx())
260 seq_printf(s, "%s (%s) = %lu / %lu = %lu\n",
261 fclk_name, fclk_real_name,
263 dpll4_ck_rate / dpll4_m4_ck_rate,
266 seq_printf(s, "%s (%s) = %lu / %lu * 2 = %lu\n",
267 fclk_name, fclk_real_name,
269 dpll4_ck_rate / dpll4_m4_ck_rate,
272 seq_printf(s, "%s (%s) = %lu\n",
273 fclk_name, fclk_real_name,
277 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
280 void dss_dump_regs(struct seq_file *s)
282 #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
284 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
286 DUMPREG(DSS_REVISION);
287 DUMPREG(DSS_SYSCONFIG);
288 DUMPREG(DSS_SYSSTATUS);
289 DUMPREG(DSS_IRQSTATUS);
290 DUMPREG(DSS_CONTROL);
292 if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
293 OMAP_DISPLAY_TYPE_SDI) {
294 DUMPREG(DSS_SDI_CONTROL);
295 DUMPREG(DSS_PLL_CONTROL);
296 DUMPREG(DSS_SDI_STATUS);
299 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
303 void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
309 case DSS_CLK_SRC_FCK:
312 case DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
314 dsi_wait_pll_hsdiv_dispc_active();
320 dss_feat_get_reg_field(FEAT_REG_DISPC_CLK_SWITCH, &start, &end);
322 REG_FLD_MOD(DSS_CONTROL, b, start, end); /* DISPC_CLK_SWITCH */
324 dss.dispc_clk_source = clk_src;
327 void dss_select_dsi_clk_source(enum dss_clk_source clk_src)
332 case DSS_CLK_SRC_FCK:
335 case DSS_CLK_SRC_DSI_PLL_HSDIV_DSI:
337 dsi_wait_pll_hsdiv_dsi_active();
343 REG_FLD_MOD(DSS_CONTROL, b, 1, 1); /* DSI_CLK_SWITCH */
345 dss.dsi_clk_source = clk_src;
348 void dss_select_lcd_clk_source(enum omap_channel channel,
349 enum dss_clk_source clk_src)
353 if (!dss_has_feature(FEAT_LCD_CLK_SRC))
357 case DSS_CLK_SRC_FCK:
360 case DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
361 BUG_ON(channel != OMAP_DSS_CHANNEL_LCD);
363 dsi_wait_pll_hsdiv_dispc_active();
369 pos = channel == OMAP_DSS_CHANNEL_LCD ? 0 : 12;
370 REG_FLD_MOD(DSS_CONTROL, b, pos, pos); /* LCDx_CLK_SWITCH */
372 ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 : 1;
373 dss.lcd_clk_source[ix] = clk_src;
376 enum dss_clk_source dss_get_dispc_clk_source(void)
378 return dss.dispc_clk_source;
381 enum dss_clk_source dss_get_dsi_clk_source(void)
383 return dss.dsi_clk_source;
386 enum dss_clk_source dss_get_lcd_clk_source(enum omap_channel channel)
388 int ix = channel == OMAP_DSS_CHANNEL_LCD ? 0 : 1;
389 return dss.lcd_clk_source[ix];
392 /* calculate clock rates using dividers in cinfo */
393 int dss_calc_clock_rates(struct dss_clock_info *cinfo)
395 if (dss.dpll4_m4_ck) {
397 u16 fck_div_max = 16;
399 if (cpu_is_omap3630() || cpu_is_omap44xx())
402 if (cinfo->fck_div > fck_div_max || cinfo->fck_div == 0)
405 prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
407 cinfo->fck = prate / cinfo->fck_div;
409 if (cinfo->fck_div != 0)
411 cinfo->fck = dss_clk_get_rate(DSS_CLK_FCK);
417 int dss_set_clock_div(struct dss_clock_info *cinfo)
419 if (dss.dpll4_m4_ck) {
423 prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
424 DSSDBG("dpll4_m4 = %ld\n", prate);
426 r = clk_set_rate(dss.dpll4_m4_ck, prate / cinfo->fck_div);
430 if (cinfo->fck_div != 0)
434 DSSDBG("fck = %ld (%d)\n", cinfo->fck, cinfo->fck_div);
439 int dss_get_clock_div(struct dss_clock_info *cinfo)
441 cinfo->fck = dss_clk_get_rate(DSS_CLK_FCK);
443 if (dss.dpll4_m4_ck) {
446 prate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
448 if (cpu_is_omap3630() || cpu_is_omap44xx())
449 cinfo->fck_div = prate / (cinfo->fck);
451 cinfo->fck_div = prate / (cinfo->fck / 2);
459 unsigned long dss_get_dpll4_rate(void)
462 return clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
467 int dss_calc_clock_div(bool is_tft, unsigned long req_pck,
468 struct dss_clock_info *dss_cinfo,
469 struct dispc_clock_info *dispc_cinfo)
472 struct dss_clock_info best_dss;
473 struct dispc_clock_info best_dispc;
475 unsigned long fck, max_dss_fck;
477 u16 fck_div, fck_div_max = 16;
482 prate = dss_get_dpll4_rate();
484 max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
486 fck = dss_clk_get_rate(DSS_CLK_FCK);
487 if (req_pck == dss.cache_req_pck &&
488 ((cpu_is_omap34xx() && prate == dss.cache_prate) ||
489 dss.cache_dss_cinfo.fck == fck)) {
490 DSSDBG("dispc clock info found from cache.\n");
491 *dss_cinfo = dss.cache_dss_cinfo;
492 *dispc_cinfo = dss.cache_dispc_cinfo;
496 min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK;
498 if (min_fck_per_pck &&
499 req_pck * min_fck_per_pck > max_dss_fck) {
500 DSSERR("Requested pixel clock not possible with the current "
501 "OMAP2_DSS_MIN_FCK_PER_PCK setting. Turning "
502 "the constraint off.\n");
507 memset(&best_dss, 0, sizeof(best_dss));
508 memset(&best_dispc, 0, sizeof(best_dispc));
510 if (dss.dpll4_m4_ck == NULL) {
511 struct dispc_clock_info cur_dispc;
512 /* XXX can we change the clock on omap2? */
513 fck = dss_clk_get_rate(DSS_CLK_FCK);
516 dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
520 best_dss.fck_div = fck_div;
522 best_dispc = cur_dispc;
526 if (cpu_is_omap3630() || cpu_is_omap44xx())
529 for (fck_div = fck_div_max; fck_div > 0; --fck_div) {
530 struct dispc_clock_info cur_dispc;
532 if (fck_div_max == 32)
533 fck = prate / fck_div;
535 fck = prate / fck_div * 2;
537 if (fck > max_dss_fck)
540 if (min_fck_per_pck &&
541 fck < req_pck * min_fck_per_pck)
546 dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
548 if (abs(cur_dispc.pck - req_pck) <
549 abs(best_dispc.pck - req_pck)) {
552 best_dss.fck_div = fck_div;
554 best_dispc = cur_dispc;
556 if (cur_dispc.pck == req_pck)
564 if (min_fck_per_pck) {
565 DSSERR("Could not find suitable clock settings.\n"
566 "Turning FCK/PCK constraint off and"
572 DSSERR("Could not find suitable clock settings.\n");
578 *dss_cinfo = best_dss;
580 *dispc_cinfo = best_dispc;
582 dss.cache_req_pck = req_pck;
583 dss.cache_prate = prate;
584 dss.cache_dss_cinfo = best_dss;
585 dss.cache_dispc_cinfo = best_dispc;
590 static int _omap_dss_wait_reset(void)
594 while (REG_GET(DSS_SYSSTATUS, 0, 0) == 0) {
596 DSSERR("soft reset failed\n");
605 static int _omap_dss_reset(void)
608 REG_FLD_MOD(DSS_SYSCONFIG, 1, 1, 1);
609 return _omap_dss_wait_reset();
612 void dss_set_venc_output(enum omap_dss_venc_type type)
616 if (type == OMAP_DSS_VENC_TYPE_COMPOSITE)
618 else if (type == OMAP_DSS_VENC_TYPE_SVIDEO)
623 /* venc out selection. 0 = comp, 1 = svideo */
624 REG_FLD_MOD(DSS_CONTROL, l, 6, 6);
627 void dss_set_dac_pwrdn_bgz(bool enable)
629 REG_FLD_MOD(DSS_CONTROL, enable, 5, 5); /* DAC Power-Down Control */
632 void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select hdmi)
634 REG_FLD_MOD(DSS_CONTROL, hdmi, 15, 15); /* VENC_HDMI_SWITCH */
637 static int dss_init(void)
641 struct resource *dss_mem;
642 struct clk *dpll4_m4_ck;
644 dss_mem = platform_get_resource(dss.pdev, IORESOURCE_MEM, 0);
646 DSSERR("can't get IORESOURCE_MEM DSS\n");
650 dss.base = ioremap(dss_mem->start, resource_size(dss_mem));
652 DSSERR("can't ioremap DSS\n");
657 /* disable LCD and DIGIT output. This seems to fix the synclost
658 * problem that we get, if the bootloader starts the DSS and
659 * the kernel resets it */
660 omap_writel(omap_readl(0x48050440) & ~0x3, 0x48050440);
662 /* We need to wait here a bit, otherwise we sometimes start to
663 * get synclost errors, and after that only power cycle will
664 * restore DSS functionality. I have no idea why this happens.
665 * And we have to wait _before_ resetting the DSS, but after
673 REG_FLD_MOD(DSS_SYSCONFIG, 1, 0, 0);
676 REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
678 #ifdef CONFIG_OMAP2_DSS_VENC
679 REG_FLD_MOD(DSS_CONTROL, 1, 4, 4); /* venc dac demen */
680 REG_FLD_MOD(DSS_CONTROL, 1, 3, 3); /* venc clock 4x enable */
681 REG_FLD_MOD(DSS_CONTROL, 0, 2, 2); /* venc clock mode = normal */
683 if (cpu_is_omap34xx()) {
684 dpll4_m4_ck = clk_get(NULL, "dpll4_m4_ck");
685 if (IS_ERR(dpll4_m4_ck)) {
686 DSSERR("Failed to get dpll4_m4_ck\n");
687 r = PTR_ERR(dpll4_m4_ck);
690 } else if (cpu_is_omap44xx()) {
691 dpll4_m4_ck = clk_get(NULL, "dpll_per_m5x2_ck");
692 if (IS_ERR(dpll4_m4_ck)) {
693 DSSERR("Failed to get dpll4_m4_ck\n");
694 r = PTR_ERR(dpll4_m4_ck);
697 } else { /* omap24xx */
701 dss.dpll4_m4_ck = dpll4_m4_ck;
703 dss.dsi_clk_source = DSS_CLK_SRC_FCK;
704 dss.dispc_clk_source = DSS_CLK_SRC_FCK;
705 dss.lcd_clk_source[0] = DSS_CLK_SRC_FCK;
706 dss.lcd_clk_source[1] = DSS_CLK_SRC_FCK;
710 rev = dss_read_reg(DSS_REVISION);
711 printk(KERN_INFO "OMAP DSS rev %d.%d\n",
712 FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
722 static void dss_exit(void)
725 clk_put(dss.dpll4_m4_ck);
731 static int dss_get_ctx_id(void)
733 struct omap_display_platform_data *pdata = dss.pdev->dev.platform_data;
736 if (!pdata->board_data->get_last_off_on_transaction_id)
738 r = pdata->board_data->get_last_off_on_transaction_id(&dss.pdev->dev);
740 dev_err(&dss.pdev->dev, "getting transaction ID failed, "
741 "will force context restore\n");
747 int dss_need_ctx_restore(void)
749 int id = dss_get_ctx_id();
751 if (id < 0 || id != dss.ctx_id) {
752 DSSDBG("ctx id %d -> id %d\n",
761 static void save_all_ctx(void)
763 DSSDBG("save context\n");
765 dss_clk_enable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK);
768 dispc_save_context();
769 #ifdef CONFIG_OMAP2_DSS_DSI
773 dss_clk_disable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK);
776 static void restore_all_ctx(void)
778 DSSDBG("restore context\n");
780 dss_clk_enable_all_no_ctx();
782 dss_restore_context();
783 dispc_restore_context();
784 #ifdef CONFIG_OMAP2_DSS_DSI
785 dsi_restore_context();
788 dss_clk_disable_all_no_ctx();
791 static int dss_get_clock(struct clk **clock, const char *clk_name)
795 clk = clk_get(&dss.pdev->dev, clk_name);
798 DSSERR("can't get clock %s", clk_name);
804 DSSDBG("clk %s, rate %ld\n", clk_name, clk_get_rate(clk));
809 static int dss_get_clocks(void)
812 struct omap_display_platform_data *pdata = dss.pdev->dev.platform_data;
816 dss.dss_sys_clk = NULL;
817 dss.dss_tv_fck = NULL;
818 dss.dss_video_fck = NULL;
820 r = dss_get_clock(&dss.dss_ick, "ick");
824 r = dss_get_clock(&dss.dss_fck, "fck");
828 if (!pdata->opt_clock_available) {
833 if (pdata->opt_clock_available("sys_clk")) {
834 r = dss_get_clock(&dss.dss_sys_clk, "sys_clk");
839 if (pdata->opt_clock_available("tv_clk")) {
840 r = dss_get_clock(&dss.dss_tv_fck, "tv_clk");
845 if (pdata->opt_clock_available("video_clk")) {
846 r = dss_get_clock(&dss.dss_video_fck, "video_clk");
855 clk_put(dss.dss_ick);
857 clk_put(dss.dss_fck);
859 clk_put(dss.dss_sys_clk);
861 clk_put(dss.dss_tv_fck);
862 if (dss.dss_video_fck)
863 clk_put(dss.dss_video_fck);
868 static void dss_put_clocks(void)
870 if (dss.dss_video_fck)
871 clk_put(dss.dss_video_fck);
873 clk_put(dss.dss_tv_fck);
875 clk_put(dss.dss_sys_clk);
876 clk_put(dss.dss_fck);
877 clk_put(dss.dss_ick);
880 unsigned long dss_clk_get_rate(enum dss_clock clk)
884 return clk_get_rate(dss.dss_ick);
886 return clk_get_rate(dss.dss_fck);
888 return clk_get_rate(dss.dss_sys_clk);
890 return clk_get_rate(dss.dss_tv_fck);
892 return clk_get_rate(dss.dss_video_fck);
899 static unsigned count_clk_bits(enum dss_clock clks)
901 unsigned num_clks = 0;
903 if (clks & DSS_CLK_ICK)
905 if (clks & DSS_CLK_FCK)
907 if (clks & DSS_CLK_SYSCK)
909 if (clks & DSS_CLK_TVFCK)
911 if (clks & DSS_CLK_VIDFCK)
917 static void dss_clk_enable_no_ctx(enum dss_clock clks)
919 unsigned num_clks = count_clk_bits(clks);
921 if (clks & DSS_CLK_ICK)
922 clk_enable(dss.dss_ick);
923 if (clks & DSS_CLK_FCK)
924 clk_enable(dss.dss_fck);
925 if ((clks & DSS_CLK_SYSCK) && dss.dss_sys_clk)
926 clk_enable(dss.dss_sys_clk);
927 if ((clks & DSS_CLK_TVFCK) && dss.dss_tv_fck)
928 clk_enable(dss.dss_tv_fck);
929 if ((clks & DSS_CLK_VIDFCK) && dss.dss_video_fck)
930 clk_enable(dss.dss_video_fck);
932 dss.num_clks_enabled += num_clks;
935 void dss_clk_enable(enum dss_clock clks)
937 bool check_ctx = dss.num_clks_enabled == 0;
939 dss_clk_enable_no_ctx(clks);
942 * HACK: On omap4 the registers may not be accessible right after
943 * enabling the clocks. At some point this will be handled by
944 * pm_runtime, but for the time begin this should make things work.
946 if (cpu_is_omap44xx() && check_ctx)
949 if (check_ctx && cpu_is_omap34xx() && dss_need_ctx_restore())
953 static void dss_clk_disable_no_ctx(enum dss_clock clks)
955 unsigned num_clks = count_clk_bits(clks);
957 if (clks & DSS_CLK_ICK)
958 clk_disable(dss.dss_ick);
959 if (clks & DSS_CLK_FCK)
960 clk_disable(dss.dss_fck);
961 if ((clks & DSS_CLK_SYSCK) && dss.dss_sys_clk)
962 clk_disable(dss.dss_sys_clk);
963 if ((clks & DSS_CLK_TVFCK) && dss.dss_tv_fck)
964 clk_disable(dss.dss_tv_fck);
965 if ((clks & DSS_CLK_VIDFCK) && dss.dss_video_fck)
966 clk_disable(dss.dss_video_fck);
968 dss.num_clks_enabled -= num_clks;
971 void dss_clk_disable(enum dss_clock clks)
973 if (cpu_is_omap34xx()) {
974 unsigned num_clks = count_clk_bits(clks);
976 BUG_ON(dss.num_clks_enabled < num_clks);
978 if (dss.num_clks_enabled == num_clks)
982 dss_clk_disable_no_ctx(clks);
985 static void dss_clk_enable_all_no_ctx(void)
989 clks = DSS_CLK_ICK | DSS_CLK_FCK | DSS_CLK_SYSCK | DSS_CLK_TVFCK;
990 if (cpu_is_omap34xx())
991 clks |= DSS_CLK_VIDFCK;
992 dss_clk_enable_no_ctx(clks);
995 static void dss_clk_disable_all_no_ctx(void)
999 clks = DSS_CLK_ICK | DSS_CLK_FCK | DSS_CLK_SYSCK | DSS_CLK_TVFCK;
1000 if (cpu_is_omap34xx())
1001 clks |= DSS_CLK_VIDFCK;
1002 dss_clk_disable_no_ctx(clks);
1005 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
1007 static void core_dump_clocks(struct seq_file *s)
1010 struct clk *clocks[5] = {
1018 seq_printf(s, "- CORE -\n");
1020 seq_printf(s, "internal clk count\t\t%u\n", dss.num_clks_enabled);
1022 for (i = 0; i < 5; i++) {
1025 seq_printf(s, "%-15s\t%lu\t%d\n",
1027 clk_get_rate(clocks[i]),
1028 clocks[i]->usecount);
1031 #endif /* defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT) */
1034 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_OMAP2_DSS_DEBUG_SUPPORT)
1035 void dss_debug_dump_clocks(struct seq_file *s)
1037 core_dump_clocks(s);
1039 dispc_dump_clocks(s);
1040 #ifdef CONFIG_OMAP2_DSS_DSI
1047 /* DSS HW IP initialisation */
1048 static int omap_dsshw_probe(struct platform_device *pdev)
1054 r = dss_get_clocks();
1058 dss_clk_enable_all_no_ctx();
1060 dss.ctx_id = dss_get_ctx_id();
1061 DSSDBG("initial ctx id %u\n", dss.ctx_id);
1065 DSSERR("Failed to initialize DSS\n");
1071 DSSERR("Failed to initialize DPI\n");
1077 DSSERR("Failed to initialize SDI\n");
1081 dss_clk_disable_all_no_ctx();
1088 dss_clk_disable_all_no_ctx();
1094 static int omap_dsshw_remove(struct platform_device *pdev)
1100 * As part of hwmod changes, DSS is not the only controller of dss
1101 * clocks; hwmod framework itself will also enable clocks during hwmod
1102 * init for dss, and autoidle is set in h/w for DSS. Hence, there's no
1103 * need to disable clocks if their usecounts > 1.
1105 WARN_ON(dss.num_clks_enabled > 0);
1111 static struct platform_driver omap_dsshw_driver = {
1112 .probe = omap_dsshw_probe,
1113 .remove = omap_dsshw_remove,
1115 .name = "omapdss_dss",
1116 .owner = THIS_MODULE,
1120 int dss_init_platform_driver(void)
1122 return platform_driver_register(&omap_dsshw_driver);
1125 void dss_uninit_platform_driver(void)
1127 return platform_driver_unregister(&omap_dsshw_driver);