2 * OMAP2 Remote Frame Buffer Interface support
4 * Copyright (C) 2005 Nokia Corporation
5 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
6 * Imre Deak <imre.deak@nokia.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/i2c.h>
25 #include <linux/err.h>
26 #include <linux/interrupt.h>
27 #include <linux/clk.h>
30 #include <mach/omapfb.h>
34 /* To work around an RFBI transfer rate limitation */
35 #define OMAP_RFBI_RATE_LIMIT 1
37 #define RFBI_BASE 0x48050800
38 #define RFBI_REVISION 0x0000
39 #define RFBI_SYSCONFIG 0x0010
40 #define RFBI_SYSSTATUS 0x0014
41 #define RFBI_CONTROL 0x0040
42 #define RFBI_PIXEL_CNT 0x0044
43 #define RFBI_LINE_NUMBER 0x0048
44 #define RFBI_CMD 0x004c
45 #define RFBI_PARAM 0x0050
46 #define RFBI_DATA 0x0054
47 #define RFBI_READ 0x0058
48 #define RFBI_STATUS 0x005c
49 #define RFBI_CONFIG0 0x0060
50 #define RFBI_ONOFF_TIME0 0x0064
51 #define RFBI_CYCLE_TIME0 0x0068
52 #define RFBI_DATA_CYCLE1_0 0x006c
53 #define RFBI_DATA_CYCLE2_0 0x0070
54 #define RFBI_DATA_CYCLE3_0 0x0074
55 #define RFBI_VSYNC_WIDTH 0x0090
56 #define RFBI_HSYNC_WIDTH 0x0094
58 #define DISPC_BASE 0x48050400
59 #define DISPC_CONTROL 0x0040
63 void (*lcdc_callback)(void *data);
64 void *lcdc_callback_data;
67 struct omapfb_device *fbdev;
70 unsigned tearsync_pin_cnt;
71 unsigned tearsync_mode;
74 static inline void rfbi_write_reg(int idx, u32 val)
76 __raw_writel(val, rfbi.base + idx);
79 static inline u32 rfbi_read_reg(int idx)
81 return __raw_readl(rfbi.base + idx);
84 static int rfbi_get_clocks(void)
86 if (IS_ERR((rfbi.dss_ick = clk_get(rfbi.fbdev->dev, "dss_ick")))) {
87 dev_err(rfbi.fbdev->dev, "can't get dss_ick\n");
88 return PTR_ERR(rfbi.dss_ick);
91 if (IS_ERR((rfbi.dss1_fck = clk_get(rfbi.fbdev->dev, "dss1_fck")))) {
92 dev_err(rfbi.fbdev->dev, "can't get dss1_fck\n");
93 clk_put(rfbi.dss_ick);
94 return PTR_ERR(rfbi.dss1_fck);
100 static void rfbi_put_clocks(void)
102 clk_put(rfbi.dss1_fck);
103 clk_put(rfbi.dss_ick);
106 static void rfbi_enable_clocks(int enable)
109 clk_enable(rfbi.dss_ick);
110 clk_enable(rfbi.dss1_fck);
112 clk_disable(rfbi.dss1_fck);
113 clk_disable(rfbi.dss_ick);
119 static void rfbi_print_timings(void)
124 l = rfbi_read_reg(RFBI_CONFIG0);
125 time = 1000000000 / rfbi.l4_khz;
129 dev_dbg(rfbi.fbdev->dev, "Tick time %u ps\n", time);
130 l = rfbi_read_reg(RFBI_ONOFF_TIME0);
131 dev_dbg(rfbi.fbdev->dev,
132 "CSONTIME %d, CSOFFTIME %d, WEONTIME %d, WEOFFTIME %d, "
133 "REONTIME %d, REOFFTIME %d\n",
134 l & 0x0f, (l >> 4) & 0x3f, (l >> 10) & 0x0f, (l >> 14) & 0x3f,
135 (l >> 20) & 0x0f, (l >> 24) & 0x3f);
137 l = rfbi_read_reg(RFBI_CYCLE_TIME0);
138 dev_dbg(rfbi.fbdev->dev,
139 "WECYCLETIME %d, RECYCLETIME %d, CSPULSEWIDTH %d, "
141 (l & 0x3f), (l >> 6) & 0x3f, (l >> 12) & 0x3f,
145 static void rfbi_print_timings(void) {}
148 static void rfbi_set_timings(const struct extif_timings *t)
152 BUG_ON(!t->converted);
154 rfbi_enable_clocks(1);
155 rfbi_write_reg(RFBI_ONOFF_TIME0, t->tim[0]);
156 rfbi_write_reg(RFBI_CYCLE_TIME0, t->tim[1]);
158 l = rfbi_read_reg(RFBI_CONFIG0);
160 l |= (t->tim[2] ? 1 : 0) << 4;
161 rfbi_write_reg(RFBI_CONFIG0, l);
163 rfbi_print_timings();
164 rfbi_enable_clocks(0);
167 static void rfbi_get_clk_info(u32 *clk_period, u32 *max_clk_div)
169 *clk_period = 1000000000 / rfbi.l4_khz;
173 static int ps_to_rfbi_ticks(int time, int div)
175 unsigned long tick_ps;
178 /* Calculate in picosecs to yield more exact results */
179 tick_ps = 1000000000 / (rfbi.l4_khz) * div;
181 ret = (time + tick_ps - 1) / tick_ps;
186 #ifdef OMAP_RFBI_RATE_LIMIT
187 static unsigned long rfbi_get_max_tx_rate(void)
189 unsigned long l4_rate, dss1_rate;
190 int min_l4_ticks = 0;
193 /* According to TI this can't be calculated so make the
194 * adjustments for a couple of known frequencies and warn for
197 static const struct {
198 unsigned long l4_clk; /* HZ */
199 unsigned long dss1_clk; /* HZ */
200 unsigned long min_l4_ticks;
202 { 55, 132, 7, }, /* 7.86 MPix/s */
203 { 110, 110, 12, }, /* 9.16 MPix/s */
204 { 110, 132, 10, }, /* 11 Mpix/s */
205 { 120, 120, 10, }, /* 12 Mpix/s */
206 { 133, 133, 10, }, /* 13.3 Mpix/s */
209 l4_rate = rfbi.l4_khz / 1000;
210 dss1_rate = clk_get_rate(rfbi.dss1_fck) / 1000000;
212 for (i = 0; i < ARRAY_SIZE(ftab); i++) {
213 /* Use a window instead of an exact match, to account
214 * for different DPLL multiplier / divider pairs.
216 if (abs(ftab[i].l4_clk - l4_rate) < 3 &&
217 abs(ftab[i].dss1_clk - dss1_rate) < 3) {
218 min_l4_ticks = ftab[i].min_l4_ticks;
222 if (i == ARRAY_SIZE(ftab)) {
223 /* Can't be sure, return anyway the maximum not
224 * rate-limited. This might cause a problem only for the
225 * tearing synchronisation.
227 dev_err(rfbi.fbdev->dev,
228 "can't determine maximum RFBI transfer rate\n");
229 return rfbi.l4_khz * 1000;
231 return rfbi.l4_khz * 1000 / min_l4_ticks;
234 static int rfbi_get_max_tx_rate(void)
236 return rfbi.l4_khz * 1000;
241 static int rfbi_convert_timings(struct extif_timings *t)
244 int reon, reoff, weon, weoff, cson, csoff, cs_pulse;
245 int actim, recyc, wecyc;
246 int div = t->clk_div;
248 if (div <= 0 || div > 2)
251 /* Make sure that after conversion it still holds that:
252 * weoff > weon, reoff > reon, recyc >= reoff, wecyc >= weoff,
253 * csoff > cson, csoff >= max(weoff, reoff), actim > reon
255 weon = ps_to_rfbi_ticks(t->we_on_time, div);
256 weoff = ps_to_rfbi_ticks(t->we_off_time, div);
264 reon = ps_to_rfbi_ticks(t->re_on_time, div);
265 reoff = ps_to_rfbi_ticks(t->re_off_time, div);
273 cson = ps_to_rfbi_ticks(t->cs_on_time, div);
274 csoff = ps_to_rfbi_ticks(t->cs_off_time, div);
277 if (csoff < max(weoff, reoff))
278 csoff = max(weoff, reoff);
293 actim = ps_to_rfbi_ticks(t->access_time, div);
299 wecyc = ps_to_rfbi_ticks(t->we_cycle_time, div);
305 recyc = ps_to_rfbi_ticks(t->re_cycle_time, div);
311 cs_pulse = ps_to_rfbi_ticks(t->cs_pulse_width, div);
329 static int rfbi_setup_tearsync(unsigned pin_cnt,
330 unsigned hs_pulse_time, unsigned vs_pulse_time,
331 int hs_pol_inv, int vs_pol_inv, int extif_div)
337 if (pin_cnt != 1 && pin_cnt != 2)
340 hs = ps_to_rfbi_ticks(hs_pulse_time, 1);
341 vs = ps_to_rfbi_ticks(vs_pulse_time, 1);
352 rfbi.tearsync_pin_cnt = pin_cnt;
353 dev_dbg(rfbi.fbdev->dev,
354 "setup_tearsync: pins %d hs %d vs %d hs_inv %d vs_inv %d\n",
355 pin_cnt, hs, vs, hs_pol_inv, vs_pol_inv);
357 rfbi_enable_clocks(1);
358 rfbi_write_reg(RFBI_HSYNC_WIDTH, hs);
359 rfbi_write_reg(RFBI_VSYNC_WIDTH, vs);
361 l = rfbi_read_reg(RFBI_CONFIG0);
370 rfbi_enable_clocks(0);
375 static int rfbi_enable_tearsync(int enable, unsigned line)
379 dev_dbg(rfbi.fbdev->dev, "tearsync %d line %d mode %d\n",
380 enable, line, rfbi.tearsync_mode);
381 if (line > (1 << 11) - 1)
384 rfbi_enable_clocks(1);
385 l = rfbi_read_reg(RFBI_CONFIG0);
388 rfbi.tearsync_mode = rfbi.tearsync_pin_cnt;
389 l |= rfbi.tearsync_mode << 2;
391 rfbi.tearsync_mode = 0;
392 rfbi_write_reg(RFBI_CONFIG0, l);
393 rfbi_write_reg(RFBI_LINE_NUMBER, line);
394 rfbi_enable_clocks(0);
399 static void rfbi_write_command(const void *buf, unsigned int len)
401 rfbi_enable_clocks(1);
402 if (rfbi.bits_per_cycle == 16) {
405 for (; len; len -= 2)
406 rfbi_write_reg(RFBI_CMD, *w++);
409 BUG_ON(rfbi.bits_per_cycle != 8);
411 rfbi_write_reg(RFBI_CMD, *b++);
413 rfbi_enable_clocks(0);
416 static void rfbi_read_data(void *buf, unsigned int len)
418 rfbi_enable_clocks(1);
419 if (rfbi.bits_per_cycle == 16) {
422 for (; len; len -= 2) {
423 rfbi_write_reg(RFBI_READ, 0);
424 *w++ = rfbi_read_reg(RFBI_READ);
428 BUG_ON(rfbi.bits_per_cycle != 8);
430 rfbi_write_reg(RFBI_READ, 0);
431 *b++ = rfbi_read_reg(RFBI_READ);
434 rfbi_enable_clocks(0);
437 static void rfbi_write_data(const void *buf, unsigned int len)
439 rfbi_enable_clocks(1);
440 if (rfbi.bits_per_cycle == 16) {
443 for (; len; len -= 2)
444 rfbi_write_reg(RFBI_PARAM, *w++);
447 BUG_ON(rfbi.bits_per_cycle != 8);
449 rfbi_write_reg(RFBI_PARAM, *b++);
451 rfbi_enable_clocks(0);
454 static void rfbi_transfer_area(int width, int height,
455 void (callback)(void * data), void *data)
459 BUG_ON(callback == NULL);
461 rfbi_enable_clocks(1);
462 omap_dispc_set_lcd_size(width, height);
464 rfbi.lcdc_callback = callback;
465 rfbi.lcdc_callback_data = data;
467 rfbi_write_reg(RFBI_PIXEL_CNT, width * height);
469 w = rfbi_read_reg(RFBI_CONTROL);
471 if (!rfbi.tearsync_mode)
472 w |= 1 << 4; /* internal trigger, reset by HW */
473 rfbi_write_reg(RFBI_CONTROL, w);
475 omap_dispc_enable_lcd_out(1);
478 static inline void _stop_transfer(void)
482 w = rfbi_read_reg(RFBI_CONTROL);
483 rfbi_write_reg(RFBI_CONTROL, w & ~(1 << 0));
484 rfbi_enable_clocks(0);
487 static void rfbi_dma_callback(void *data)
490 rfbi.lcdc_callback(rfbi.lcdc_callback_data);
493 static void rfbi_set_bits_per_cycle(int bpc)
497 rfbi_enable_clocks(1);
498 l = rfbi_read_reg(RFBI_CONFIG0);
510 rfbi_write_reg(RFBI_CONFIG0, l);
511 rfbi.bits_per_cycle = bpc;
512 rfbi_enable_clocks(0);
515 static int rfbi_init(struct omapfb_device *fbdev)
521 rfbi.base = io_p2v(RFBI_BASE);
523 if ((r = rfbi_get_clocks()) < 0)
525 rfbi_enable_clocks(1);
527 rfbi.l4_khz = clk_get_rate(rfbi.dss_ick) / 1000;
530 rfbi_write_reg(RFBI_SYSCONFIG, 1 << 1);
531 while (!(rfbi_read_reg(RFBI_SYSSTATUS) & (1 << 0)));
533 l = rfbi_read_reg(RFBI_SYSCONFIG);
534 /* Enable autoidle and smart-idle */
535 l |= (1 << 0) | (2 << 3);
536 rfbi_write_reg(RFBI_SYSCONFIG, l);
538 /* 16-bit interface, ITE trigger mode, 16-bit data */
539 l = (0x03 << 0) | (0x00 << 2) | (0x01 << 5) | (0x02 << 7);
540 l |= (0 << 9) | (1 << 20) | (1 << 21);
541 rfbi_write_reg(RFBI_CONFIG0, l);
543 rfbi_write_reg(RFBI_DATA_CYCLE1_0, 0x00000010);
545 l = rfbi_read_reg(RFBI_CONTROL);
546 /* Select CS0, clear bypass mode */
548 rfbi_write_reg(RFBI_CONTROL, l);
550 if ((r = omap_dispc_request_irq(rfbi_dma_callback, NULL)) < 0) {
551 dev_err(fbdev->dev, "can't get DISPC irq\n");
552 rfbi_enable_clocks(0);
556 l = rfbi_read_reg(RFBI_REVISION);
557 pr_info("omapfb: RFBI version %d.%d initialized\n",
558 (l >> 4) & 0x0f, l & 0x0f);
560 rfbi_enable_clocks(0);
565 static void rfbi_cleanup(void)
567 omap_dispc_free_irq();
571 const struct lcd_ctrl_extif omap2_ext_if = {
573 .cleanup = rfbi_cleanup,
574 .get_clk_info = rfbi_get_clk_info,
575 .get_max_tx_rate = rfbi_get_max_tx_rate,
576 .set_bits_per_cycle = rfbi_set_bits_per_cycle,
577 .convert_timings = rfbi_convert_timings,
578 .set_timings = rfbi_set_timings,
579 .write_command = rfbi_write_command,
580 .read_data = rfbi_read_data,
581 .write_data = rfbi_write_data,
582 .transfer_area = rfbi_transfer_area,
583 .setup_tearsync = rfbi_setup_tearsync,
584 .enable_tearsync = rfbi_enable_tearsync,
586 .max_transmit_size = (u32) ~0,