/*
* 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 __init sh_mipi_setup(struct sh_mipi *mipi,
struct sh_mipi_dsi_info *pdata)
{
void __iomem *base = mipi->base;
struct sh_mobile_lcdc_chan_cfg *ch = pdata->lcd_chan;
u32 pctype, datatype, pixfmt, linelength, vmctr2;
u32 tmp, top, bottom, delay, div;
bool yuv;
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 = ch->lcd_modes[0].xres * 3;
yuv = false;
break;
case MIPI_RGB565:
pctype = 1;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
linelength = ch->lcd_modes[0].xres * 2;
yuv = false;
break;
case MIPI_RGB666_LP:
pctype = 2;
datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
linelength = ch->lcd_modes[0].xres * 3;
yuv = false;
break;
case MIPI_RGB666:
pctype = 3;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
linelength = (ch->lcd_modes[0].xres * 18 + 7) / 8;
yuv = false;
break;
case MIPI_BGR888:
pctype = 8;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
linelength = ch->lcd_modes[0].xres * 3;
yuv = false;
break;
case MIPI_BGR565:
pctype = 9;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
linelength = ch->lcd_modes[0].xres * 2;
yuv = false;
break;
case MIPI_BGR666_LP:
pctype = 0xa;
datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
linelength = ch->lcd_modes[0].xres * 3;
yuv = false;
break;
case MIPI_BGR666:
pctype = 0xb;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
linelength = (ch->lcd_modes[0].xres * 18 + 7) / 8;
yuv = false;
break;
case MIPI_YUYV:
pctype = 4;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
linelength = ch->lcd_modes[0].xres * 2;
yuv = true;
break;
case MIPI_UYVY:
pctype = 5;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
linelength = ch->lcd_modes[0].xres * 2;
yuv = true;
break;
case MIPI_YUV420_L:
pctype = 6;
datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
linelength = (ch->lcd_modes[0].xres * 12 + 7) / 8;
yuv = true;
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 = (ch->lcd_modes[0].xres + 1) / 2;
yuv = true;
break;
default:
return -EINVAL;
}
if ((yuv && ch->interface_type != YUV422) ||
(!yuv && ch->interface_type != RGB24))
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((ch->lcd_modes[0].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 * ch->lcd_modes[0].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 = ch->lcd_modes[0].hsync_len + ch->lcd_modes[0].left_margin;
top = ((pdata->lane * top / div) - 10) << 16;
}
if (pdata->flags & SH_MIPI_DSI_HBPBM) { /* HFPLEN */
bottom = ch->lcd_modes[0].right_margin;
bottom = (pdata->lane * bottom / div) - 12;
}
bpp = linelength / ch->lcd_modes[0].xres; /* byte / pixel */
if ((pdata->lane / div) > bpp) {
tmp = ch->lcd_modes[0].xres / bpp; /* output cycle */
tmp = ch->lcd_modes[0].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(ch->chan, 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(ch->chan, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
/* cf. set_data_lines() */
sh_mipi_dcs_param(ch->chan, MIPI_DCS_SET_PIXEL_FORMAT,
pixfmt << 4);
sh_mipi_dcs(ch->chan, 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, pdata);
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 __exit 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 = __exit_p(sh_mipi_remove),
.shutdown = sh_mipi_shutdown,
.driver = {
.name = "sh-mipi-dsi",
},
};
static int __init sh_mipi_init(void)
{
return platform_driver_probe(&sh_mipi_driver, sh_mipi_probe);
}
module_init(sh_mipi_init);
static void __exit sh_mipi_exit(void)
{
platform_driver_unregister(&sh_mipi_driver);
}
module_exit(sh_mipi_exit);
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
MODULE_LICENSE("GPL v2");
