--- /dev/null
+/*
+ * 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));
+ 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");
Code Review / kvmfornfv.git / blobdiff