1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2004-2005 Nokia Corporation
10 #include <linux/clk.h>
15 #include <linux/omap-dma.h>
16 #include <linux/soc/ti/omap1-io.h>
22 #define MODULE_NAME		"omapfb-sossi"
49 	struct clk	*fck;
114 static u32 ps_to_sossi_ticks(u32 ps, int div)  in ps_to_sossi_ticks()  argument
117 	return (clk_period + ps - 1) / clk_period;  in ps_to_sossi_ticks()
124 	int div = t->clk_div;  in calc_rd_timings()
130 	reon = ps_to_sossi_ticks(t->re_on_time, div);  in calc_rd_timings()
133 		return -1;  in calc_rd_timings()
135 	reoff = ps_to_sossi_ticks(t->re_off_time, div);  in calc_rd_timings()
140 	tw0 = reoff - reon;  in calc_rd_timings()
142 		return -1;  in calc_rd_timings()
144 	recyc = ps_to_sossi_ticks(t->re_cycle_time, div);  in calc_rd_timings()
148 	tw1 = recyc - tw0;  in calc_rd_timings()
153 		return -1;  in calc_rd_timings()
155 	actim = ps_to_sossi_ticks(t->access_time, div);  in calc_rd_timings()
162 	if (actim - reoff > 1)  in calc_rd_timings()
163 		return -1;  in calc_rd_timings()
165 	t->tim[0] = tw0 - 1;  in calc_rd_timings()
166 	t->tim[1] = tw1 - 1;  in calc_rd_timings()
175 	int div = t->clk_div;  in calc_wr_timings()
181 	weon = ps_to_sossi_ticks(t->we_on_time, div);  in calc_wr_timings()
184 		return -1;  in calc_wr_timings()
186 	weoff = ps_to_sossi_ticks(t->we_off_time, div);  in calc_wr_timings()
189 	tw0 = weoff - weon;  in calc_wr_timings()
191 		return -1;  in calc_wr_timings()
193 	wecyc = ps_to_sossi_ticks(t->we_cycle_time, div);  in calc_wr_timings()
197 	tw1 = wecyc - tw0;  in calc_wr_timings()
202 		return -1;  in calc_wr_timings()
204 	t->tim[2] = tw0 - 1;  in calc_wr_timings()
205 	t->tim[3] = tw1 - 1;  in calc_wr_timings()
215 	dev_dbg(sossi.fbdev->dev, "Using TW0 = %d, TW1 = %d, div = %d\n",  in _set_timing()
234 	l |= ((bus_pick_count - 1) << 5) | ((bus_pick_width - 1) & 0x1f);  in _set_bits_per_cycle()
243 	l &= ~(((1 << 11) - 1) << 15);  in _set_tearsync_mode()
289 		len -= 4;  in send_data()
294 		len -= 2;  in send_data()
299 		len--;  in send_data()
308 	BUG_ON((nr_cycles - 1) & ~0x3ffff);  in set_cycles()
311 	sossi_set_bits(SOSSI_INIT1_REG, (nr_cycles - 1) & 0x3ffff);  in set_cycles()
317 	int div = t->clk_div;  in sossi_convert_timings()
319 	t->converted = 0;  in sossi_convert_timings()
322 		return -1;  in sossi_convert_timings()
331 	t->tim[4] = div;  in sossi_convert_timings()
333 	t->converted = 1;  in sossi_convert_timings()
340 	BUG_ON(!t->converted);  in sossi_set_timings()
342 	sossi.clk_tw0[RD_ACCESS] = t->tim[0];  in sossi_set_timings()
343 	sossi.clk_tw1[RD_ACCESS] = t->tim[1];  in sossi_set_timings()
345 	sossi.clk_tw0[WR_ACCESS] = t->tim[2];  in sossi_set_timings()
346 	sossi.clk_tw1[WR_ACCESS] = t->tim[3];  in sossi_set_timings()
348 	sossi.clk_div = t->tim[4];  in sossi_set_timings()
391 		return -EINVAL;  in sossi_setup_tearsync()
396 		return -EDOM;  in sossi_setup_tearsync()
398 	vs--;  in sossi_setup_tearsync()
402 		hs--;  in sossi_setup_tearsync()
404 	dev_dbg(sossi.fbdev->dev,  in sossi_setup_tearsync()
410 	l &= ~((1 << 15) - 1);  in sossi_setup_tearsync()
431 	dev_dbg(sossi.fbdev->dev, "tearsync %d line %d\n", enable, line);  in sossi_enable_tearsync()
433 		return -EINVAL;  in sossi_enable_tearsync()
496 		 * Wait for the sync signal and start the transfer only  in sossi_transfer_area()
497 		 * then. We can't seem to be able to use HW sync DMA for  in sossi_transfer_area()
530 		len -= 4;  in sossi_read_data()
535 		len -= 2;  in sossi_read_data()
540 		len--;  in sossi_read_data()
553 		sossi.vsync_dma_pending--;  in sossi_match_irq()
563 	struct clk *fck;  in sossi_init()
564 	struct clk *dpll1out_ck;  in sossi_init()
569 		dev_err(fbdev->dev, "can't ioremap SoSSI\n");  in sossi_init()
570 		return -ENOMEM;  in sossi_init()
576 	dpll1out_ck = clk_get(fbdev->dev, "ck_dpll1out");  in sossi_init()
578 		dev_err(fbdev->dev, "can't get DPLL1OUT clock\n");  in sossi_init()
589 	fck = clk_get(fbdev->dev, "ck_sossi");  in sossi_init()
591 		dev_err(fbdev->dev, "can't get SoSSI functional clock\n");  in sossi_init()
621 		dev_err(fbdev->dev,  in sossi_init()
622 			"invalid SoSSI sync pattern: %08x, %08x\n", l, k);  in sossi_init()
623 		r = -ENODEV;  in sossi_init()
628 		dev_err(fbdev->dev, "can't get LCDC IRQ\n");  in sossi_init()
629 		r = -ENODEV;  in sossi_init()
635 	dev_info(fbdev->dev, "SoSSI version %d.%d initialized\n",  in sossi_init()
643 	if ((r = request_irq(fbdev->ext_irq, sossi_match_irq,  in sossi_init()
645 	     "sossi_match", sossi.fbdev->dev)) < 0) {  in sossi_init()
646 		dev_err(sossi.fbdev->dev, "can't get SoSSI match IRQ\n");  in sossi_init()