From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 drivers/video/sh_mipi_dsi.c | 588 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 588 insertions(+)
 create mode 100644 drivers/video/sh_mipi_dsi.c

(limited to 'drivers/video/sh_mipi_dsi.c')

diff --git a/drivers/video/sh_mipi_dsi.c b/drivers/video/sh_mipi_dsi.c
new file mode 100644
index 00000000..6cad5307
--- /dev/null
+++ b/drivers/video/sh_mipi_dsi.c
@@ -0,0 +1,588 @@
+/*
+ * Renesas SH-mobile MIPI DSI support
+ *
+ * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/bitmap.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/module.h>
+
+#include <video/mipi_display.h>
+#include <video/sh_mipi_dsi.h>
+#include <video/sh_mobile_lcdc.h>
+
+#include "sh_mobile_lcdcfb.h"
+
+#define SYSCTRL		0x0000
+#define SYSCONF		0x0004
+#define TIMSET		0x0008
+#define RESREQSET0	0x0018
+#define RESREQSET1	0x001c
+#define HSTTOVSET	0x0020
+#define LPRTOVSET	0x0024
+#define TATOVSET	0x0028
+#define PRTOVSET	0x002c
+#define DSICTRL		0x0030
+#define DSIINTE		0x0060
+#define PHYCTRL		0x0070
+
+/* relative to linkbase */
+#define DTCTR		0x0000
+#define VMCTR1		0x0020
+#define VMCTR2		0x0024
+#define VMLEN1		0x0028
+#define VMLEN2		0x002c
+#define CMTSRTREQ	0x0070
+#define CMTSRTCTR	0x00d0
+
+/* E.g., sh7372 has 2 MIPI-DSIs - one for each LCDC */
+#define MAX_SH_MIPI_DSI 2
+
+struct sh_mipi {
+	struct sh_mobile_lcdc_entity entity;
+
+	void __iomem	*base;
+	void __iomem	*linkbase;
+	struct clk	*dsit_clk;
+	struct platform_device *pdev;
+};
+
+#define to_sh_mipi(e)	container_of(e, struct sh_mipi, entity)
+
+static struct sh_mipi *mipi_dsi[MAX_SH_MIPI_DSI];
+
+/* Protect the above array */
+static DEFINE_MUTEX(array_lock);
+
+static struct sh_mipi *sh_mipi_by_handle(int handle)
+{
+	if (handle >= ARRAY_SIZE(mipi_dsi) || handle < 0)
+		return NULL;
+
+	return mipi_dsi[handle];
+}
+
+static int sh_mipi_send_short(struct sh_mipi *mipi, u8 dsi_cmd,
+			      u8 cmd, u8 param)
+{
+	u32 data = (dsi_cmd << 24) | (cmd << 16) | (param << 8);
+	int cnt = 100;
+
+	/* transmit a short packet to LCD panel */
+	iowrite32(1 | data, mipi->linkbase + CMTSRTCTR);
+	iowrite32(1, mipi->linkbase + CMTSRTREQ);
+
+	while ((ioread32(mipi->linkbase + CMTSRTREQ) & 1) && --cnt)
+		udelay(1);
+
+	return cnt ? 0 : -ETIMEDOUT;
+}
+
+#define LCD_CHAN2MIPI(c) ((c) < LCDC_CHAN_MAINLCD || (c) > LCDC_CHAN_SUBLCD ? \
+				-EINVAL : (c) - 1)
+
+static int sh_mipi_dcs(int handle, u8 cmd)
+{
+	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
+	if (!mipi)
+		return -ENODEV;
+	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE, cmd, 0);
+}
+
+static int sh_mipi_dcs_param(int handle, u8 cmd, u8 param)
+{
+	struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
+	if (!mipi)
+		return -ENODEV;
+	return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE_PARAM, cmd,
+				  param);
+}
+
+static void sh_mipi_dsi_enable(struct sh_mipi *mipi, bool enable)
+{
+	/*
+	 * enable LCDC data tx, transition to LPS after completion of each HS
+	 * packet
+	 */
+	iowrite32(0x00000002 | enable, mipi->linkbase + DTCTR);
+}
+
+static void sh_mipi_shutdown(struct platform_device *pdev)
+{
+	struct sh_mipi *mipi = to_sh_mipi(platform_get_drvdata(pdev));
+
+	sh_mipi_dsi_enable(mipi, false);
+}
+
+static int sh_mipi_setup(struct sh_mipi *mipi, const struct fb_videomode *mode)
+{
+	void __iomem *base = mipi->base;
+	struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
+	u32 pctype, datatype, pixfmt, linelength, vmctr2;
+	u32 tmp, top, bottom, delay, div;
+	int bpp;
+
+	/*
+	 * Select data format. MIPI DSI is not hot-pluggable, so, we just use
+	 * the default videomode. If this ever becomes a problem, We'll have to
+	 * move this to mipi_display_on() above and use info->var.xres
+	 */
+	switch (pdata->data_format) {
+	case MIPI_RGB888:
+		pctype = 0;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
+		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
+		linelength = mode->xres * 3;
+		break;
+	case MIPI_RGB565:
+		pctype = 1;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
+		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
+		linelength = mode->xres * 2;
+		break;
+	case MIPI_RGB666_LP:
+		pctype = 2;
+		datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
+		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
+		linelength = mode->xres * 3;
+		break;
+	case MIPI_RGB666:
+		pctype = 3;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
+		pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
+		linelength = (mode->xres * 18 + 7) / 8;
+		break;
+	case MIPI_BGR888:
+		pctype = 8;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
+		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
+		linelength = mode->xres * 3;
+		break;
+	case MIPI_BGR565:
+		pctype = 9;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
+		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
+		linelength = mode->xres * 2;
+		break;
+	case MIPI_BGR666_LP:
+		pctype = 0xa;
+		datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
+		pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
+		linelength = mode->xres * 3;
+		break;
+	case MIPI_BGR666:
+		pctype = 0xb;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
+		pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
+		linelength = (mode->xres * 18 + 7) / 8;
+		break;
+	case MIPI_YUYV:
+		pctype = 4;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
+		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
+		linelength = mode->xres * 2;
+		break;
+	case MIPI_UYVY:
+		pctype = 5;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
+		pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
+		linelength = mode->xres * 2;
+		break;
+	case MIPI_YUV420_L:
+		pctype = 6;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
+		pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
+		linelength = (mode->xres * 12 + 7) / 8;
+		break;
+	case MIPI_YUV420:
+		pctype = 7;
+		datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
+		pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
+		/* Length of U/V line */
+		linelength = (mode->xres + 1) / 2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (!pdata->lane)
+		return -EINVAL;
+
+	/* reset DSI link */
+	iowrite32(0x00000001, base + SYSCTRL);
+	/* Hold reset for 100 cycles of the slowest of bus, HS byte and LP clock */
+	udelay(50);
+	iowrite32(0x00000000, base + SYSCTRL);
+
+	/* setup DSI link */
+
+	/*
+	 * T_wakeup = 0x7000
+	 * T_hs-trail = 3
+	 * T_hs-prepare = 3
+	 * T_clk-trail = 3
+	 * T_clk-prepare = 2
+	 */
+	iowrite32(0x70003332, base + TIMSET);
+	/* no responses requested */
+	iowrite32(0x00000000, base + RESREQSET0);
+	/* request response to packets of type 0x28 */
+	iowrite32(0x00000100, base + RESREQSET1);
+	/* High-speed transmission timeout, default 0xffffffff */
+	iowrite32(0x0fffffff, base + HSTTOVSET);
+	/* LP reception timeout, default 0xffffffff */
+	iowrite32(0x0fffffff, base + LPRTOVSET);
+	/* Turn-around timeout, default 0xffffffff */
+	iowrite32(0x0fffffff, base + TATOVSET);
+	/* Peripheral reset timeout, default 0xffffffff */
+	iowrite32(0x0fffffff, base + PRTOVSET);
+	/* Interrupts not used, disable all */
+	iowrite32(0, base + DSIINTE);
+	/* DSI-Tx bias on */
+	iowrite32(0x00000001, base + PHYCTRL);
+	udelay(200);
+	/* Deassert resets, power on */
+	iowrite32(0x03070001 | pdata->phyctrl, base + PHYCTRL);
+
+	/*
+	 * Default = ULPS enable |
+	 *	Contention detection enabled |
+	 *	EoT packet transmission enable |
+	 *	CRC check enable |
+	 *	ECC check enable
+	 */
+	bitmap_fill((unsigned long *)&tmp, pdata->lane);
+	tmp |= 0x00003700;
+	iowrite32(tmp, base + SYSCONF);
+
+	/* setup l-bridge */
+
+	/*
+	 * Enable transmission of all packets,
+	 * transmit LPS after each HS packet completion
+	 */
+	iowrite32(0x00000006, mipi->linkbase + DTCTR);
+	/* VSYNC width = 2 (<< 17) */
+	iowrite32((mode->vsync_len << pdata->vsynw_offset) |
+		  (pdata->clksrc << 16) | (pctype << 12) | datatype,
+		  mipi->linkbase + VMCTR1);
+
+	/*
+	 * Non-burst mode with sync pulses: VSE and HSE are output,
+	 * HSA period allowed, no commands in LP
+	 */
+	vmctr2 = 0;
+	if (pdata->flags & SH_MIPI_DSI_VSEE)
+		vmctr2 |= 1 << 23;
+	if (pdata->flags & SH_MIPI_DSI_HSEE)
+		vmctr2 |= 1 << 22;
+	if (pdata->flags & SH_MIPI_DSI_HSAE)
+		vmctr2 |= 1 << 21;
+	if (pdata->flags & SH_MIPI_DSI_BL2E)
+		vmctr2 |= 1 << 17;
+	if (pdata->flags & SH_MIPI_DSI_HSABM)
+		vmctr2 |= 1 << 5;
+	if (pdata->flags & SH_MIPI_DSI_HBPBM)
+		vmctr2 |= 1 << 4;
+	if (pdata->flags & SH_MIPI_DSI_HFPBM)
+		vmctr2 |= 1 << 3;
+	iowrite32(vmctr2, mipi->linkbase + VMCTR2);
+
+	/*
+	 * VMLEN1 = RGBLEN | HSALEN
+	 *
+	 * see
+	 *  Video mode - Blanking Packet setting
+	 */
+	top = linelength << 16; /* RGBLEN */
+	bottom = 0x00000001;
+	if (pdata->flags & SH_MIPI_DSI_HSABM) /* HSALEN */
+		bottom = (pdata->lane * mode->hsync_len) - 10;
+	iowrite32(top | bottom , mipi->linkbase + VMLEN1);
+
+	/*
+	 * VMLEN2 = HBPLEN | HFPLEN
+	 *
+	 * see
+	 *  Video mode - Blanking Packet setting
+	 */
+	top	= 0x00010000;
+	bottom	= 0x00000001;
+	delay	= 0;
+
+	div = 1;	/* HSbyteCLK is calculation base
+			 * HS4divCLK = HSbyteCLK/2
+			 * HS6divCLK is not supported for now */
+	if (pdata->flags & SH_MIPI_DSI_HS4divCLK)
+		div = 2;
+
+	if (pdata->flags & SH_MIPI_DSI_HFPBM) {	/* HBPLEN */
+		top = mode->hsync_len + mode->left_margin;
+		top = ((pdata->lane * top / div) - 10) << 16;
+	}
+	if (pdata->flags & SH_MIPI_DSI_HBPBM) { /* HFPLEN */
+		bottom = mode->right_margin;
+		bottom = (pdata->lane * bottom / div) - 12;
+	}
+
+	bpp = linelength / mode->xres; /* byte / pixel */
+	if ((pdata->lane / div) > bpp) {
+		tmp = mode->xres / bpp; /* output cycle */
+		tmp = mode->xres - tmp; /* (input - output) cycle */
+		delay = (pdata->lane * tmp);
+	}
+
+	iowrite32(top | (bottom + delay) , mipi->linkbase + VMLEN2);
+
+	msleep(5);
+
+	/* setup LCD panel */
+
+	/* cf. drivers/video/omap/lcd_mipid.c */
+	sh_mipi_dcs(pdata->channel, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(120);
+	/*
+	 * [7] - Page Address Mode
+	 * [6] - Column Address Mode
+	 * [5] - Page / Column Address Mode
+	 * [4] - Display Device Line Refresh Order
+	 * [3] - RGB/BGR Order
+	 * [2] - Display Data Latch Data Order
+	 * [1] - Flip Horizontal
+	 * [0] - Flip Vertical
+	 */
+	sh_mipi_dcs_param(pdata->channel, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
+	/* cf. set_data_lines() */
+	sh_mipi_dcs_param(pdata->channel, MIPI_DCS_SET_PIXEL_FORMAT,
+			  pixfmt << 4);
+	sh_mipi_dcs(pdata->channel, MIPI_DCS_SET_DISPLAY_ON);
+
+	/* Enable timeout counters */
+	iowrite32(0x00000f00, base + DSICTRL);
+
+	return 0;
+}
+
+static int mipi_display_on(struct sh_mobile_lcdc_entity *entity)
+{
+	struct sh_mipi *mipi = to_sh_mipi(entity);
+	struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
+	int ret;
+
+	pm_runtime_get_sync(&mipi->pdev->dev);
+
+	ret = pdata->set_dot_clock(mipi->pdev, mipi->base, 1);
+	if (ret < 0)
+		goto mipi_display_on_fail1;
+
+	ret = sh_mipi_setup(mipi, &entity->def_mode);
+	if (ret < 0)
+		goto mipi_display_on_fail2;
+
+	sh_mipi_dsi_enable(mipi, true);
+
+	return SH_MOBILE_LCDC_DISPLAY_CONNECTED;
+
+mipi_display_on_fail1:
+	pm_runtime_put_sync(&mipi->pdev->dev);
+mipi_display_on_fail2:
+	pdata->set_dot_clock(mipi->pdev, mipi->base, 0);
+
+	return ret;
+}
+
+static void mipi_display_off(struct sh_mobile_lcdc_entity *entity)
+{
+	struct sh_mipi *mipi = to_sh_mipi(entity);
+	struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
+
+	sh_mipi_dsi_enable(mipi, false);
+
+	pdata->set_dot_clock(mipi->pdev, mipi->base, 0);
+
+	pm_runtime_put_sync(&mipi->pdev->dev);
+}
+
+static const struct sh_mobile_lcdc_entity_ops mipi_ops = {
+	.display_on = mipi_display_on,
+	.display_off = mipi_display_off,
+};
+
+static int __init sh_mipi_probe(struct platform_device *pdev)
+{
+	struct sh_mipi *mipi;
+	struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct resource *res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	unsigned long rate, f_current;
+	int idx = pdev->id, ret;
+
+	if (!res || !res2 || idx >= ARRAY_SIZE(mipi_dsi) || !pdata)
+		return -ENODEV;
+
+	if (!pdata->set_dot_clock)
+		return -EINVAL;
+
+	mutex_lock(&array_lock);
+	if (idx < 0)
+		for (idx = 0; idx < ARRAY_SIZE(mipi_dsi) && mipi_dsi[idx]; idx++)
+			;
+
+	if (idx == ARRAY_SIZE(mipi_dsi)) {
+		ret = -EBUSY;
+		goto efindslot;
+	}
+
+	mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
+	if (!mipi) {
+		ret = -ENOMEM;
+		goto ealloc;
+	}
+
+	mipi->entity.owner = THIS_MODULE;
+	mipi->entity.ops = &mipi_ops;
+
+	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
+		dev_err(&pdev->dev, "MIPI register region already claimed\n");
+		ret = -EBUSY;
+		goto ereqreg;
+	}
+
+	mipi->base = ioremap(res->start, resource_size(res));
+	if (!mipi->base) {
+		ret = -ENOMEM;
+		goto emap;
+	}
+
+	if (!request_mem_region(res2->start, resource_size(res2), pdev->name)) {
+		dev_err(&pdev->dev, "MIPI register region 2 already claimed\n");
+		ret = -EBUSY;
+		goto ereqreg2;
+	}
+
+	mipi->linkbase = ioremap(res2->start, resource_size(res2));
+	if (!mipi->linkbase) {
+		ret = -ENOMEM;
+		goto emap2;
+	}
+
+	mipi->pdev = pdev;
+
+	mipi->dsit_clk = clk_get(&pdev->dev, "dsit_clk");
+	if (IS_ERR(mipi->dsit_clk)) {
+		ret = PTR_ERR(mipi->dsit_clk);
+		goto eclktget;
+	}
+
+	f_current = clk_get_rate(mipi->dsit_clk);
+	/* 80MHz required by the datasheet */
+	rate = clk_round_rate(mipi->dsit_clk, 80000000);
+	if (rate > 0 && rate != f_current)
+		ret = clk_set_rate(mipi->dsit_clk, rate);
+	else
+		ret = rate;
+	if (ret < 0)
+		goto esettrate;
+
+	dev_dbg(&pdev->dev, "DSI-T clk %lu -> %lu\n", f_current, rate);
+
+	ret = clk_enable(mipi->dsit_clk);
+	if (ret < 0)
+		goto eclkton;
+
+	mipi_dsi[idx] = mipi;
+
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_resume(&pdev->dev);
+
+	mutex_unlock(&array_lock);
+	platform_set_drvdata(pdev, &mipi->entity);
+
+	return 0;
+
+eclkton:
+esettrate:
+	clk_put(mipi->dsit_clk);
+eclktget:
+	iounmap(mipi->linkbase);
+emap2:
+	release_mem_region(res2->start, resource_size(res2));
+ereqreg2:
+	iounmap(mipi->base);
+emap:
+	release_mem_region(res->start, resource_size(res));
+ereqreg:
+	kfree(mipi);
+ealloc:
+efindslot:
+	mutex_unlock(&array_lock);
+
+	return ret;
+}
+
+static int sh_mipi_remove(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct resource *res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	struct sh_mipi *mipi = to_sh_mipi(platform_get_drvdata(pdev));
+	int i, ret;
+
+	mutex_lock(&array_lock);
+
+	for (i = 0; i < ARRAY_SIZE(mipi_dsi) && mipi_dsi[i] != mipi; i++)
+		;
+
+	if (i == ARRAY_SIZE(mipi_dsi)) {
+		ret = -EINVAL;
+	} else {
+		ret = 0;
+		mipi_dsi[i] = NULL;
+	}
+
+	mutex_unlock(&array_lock);
+
+	if (ret < 0)
+		return ret;
+
+	pm_runtime_disable(&pdev->dev);
+	clk_disable(mipi->dsit_clk);
+	clk_put(mipi->dsit_clk);
+
+	iounmap(mipi->linkbase);
+	if (res2)
+		release_mem_region(res2->start, resource_size(res2));
+	iounmap(mipi->base);
+	if (res)
+		release_mem_region(res->start, resource_size(res));
+	platform_set_drvdata(pdev, NULL);
+	kfree(mipi);
+
+	return 0;
+}
+
+static struct platform_driver sh_mipi_driver = {
+	.remove		= sh_mipi_remove,
+	.shutdown	= sh_mipi_shutdown,
+	.driver = {
+		.name	= "sh-mipi-dsi",
+	},
+};
+
+module_platform_driver_probe(sh_mipi_driver, sh_mipi_probe);
+
+MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
+MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
+MODULE_LICENSE("GPL v2");
-- 
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