linux/drivers/video/fbdev/mxsfb.c
Marek Vasut 03577d6a0b video: mxsfb: Fix framebuffer corruption on mx6sx
Allocate the framebuffer memory as coherent, otherwise the framebuffer
will suffer from artifacts when displaying scrolling text or video.
This can be replicated on i.MX6SX (armv7), which has more complex memory
architecture compared to the i.MX23/28 (armv5).

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2016-08-30 11:59:33 +03:00

1021 lines
26 KiB
C

/*
* Copyright (C) 2010 Juergen Beisert, Pengutronix
*
* This code is based on:
* Author: Vitaly Wool <vital@embeddedalley.com>
*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define DRIVER_NAME "mxsfb"
/**
* @file
* @brief LCDIF driver for i.MX23 and i.MX28
*
* The LCDIF support four modes of operation
* - MPU interface (to drive smart displays) -> not supported yet
* - VSYNC interface (like MPU interface plus Vsync) -> not supported yet
* - Dotclock interface (to drive LC displays with RGB data and sync signals)
* - DVI (to drive ITU-R BT656) -> not supported yet
*
* This driver depends on a correct setup of the pins used for this purpose
* (platform specific).
*
* For the developer: Don't forget to set the data bus width to the display
* in the imx_fb_videomode structure. You will else end up with ugly colours.
* If you fight against jitter you can vary the clock delay. This is a feature
* of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give
* the required value in the imx_fb_videomode structure.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/fb.h>
#include <linux/regulator/consumer.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#define REG_SET 4
#define REG_CLR 8
#define LCDC_CTRL 0x00
#define LCDC_CTRL1 0x10
#define LCDC_V4_CTRL2 0x20
#define LCDC_V3_TRANSFER_COUNT 0x20
#define LCDC_V4_TRANSFER_COUNT 0x30
#define LCDC_V4_CUR_BUF 0x40
#define LCDC_V4_NEXT_BUF 0x50
#define LCDC_V3_CUR_BUF 0x30
#define LCDC_V3_NEXT_BUF 0x40
#define LCDC_TIMING 0x60
#define LCDC_VDCTRL0 0x70
#define LCDC_VDCTRL1 0x80
#define LCDC_VDCTRL2 0x90
#define LCDC_VDCTRL3 0xa0
#define LCDC_VDCTRL4 0xb0
#define LCDC_DVICTRL0 0xc0
#define LCDC_DVICTRL1 0xd0
#define LCDC_DVICTRL2 0xe0
#define LCDC_DVICTRL3 0xf0
#define LCDC_DVICTRL4 0x100
#define LCDC_V4_DATA 0x180
#define LCDC_V3_DATA 0x1b0
#define LCDC_V4_DEBUG0 0x1d0
#define LCDC_V3_DEBUG0 0x1f0
#define CTRL_SFTRST (1 << 31)
#define CTRL_CLKGATE (1 << 30)
#define CTRL_BYPASS_COUNT (1 << 19)
#define CTRL_VSYNC_MODE (1 << 18)
#define CTRL_DOTCLK_MODE (1 << 17)
#define CTRL_DATA_SELECT (1 << 16)
#define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
#define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
#define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
#define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
#define CTRL_MASTER (1 << 5)
#define CTRL_DF16 (1 << 3)
#define CTRL_DF18 (1 << 2)
#define CTRL_DF24 (1 << 1)
#define CTRL_RUN (1 << 0)
#define CTRL1_FIFO_CLEAR (1 << 21)
#define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
#define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
#define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
#define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
#define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
#define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
#define VDCTRL0_ENABLE_PRESENT (1 << 28)
#define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
#define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
#define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25)
#define VDCTRL0_ENABLE_ACT_HIGH (1 << 24)
#define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
#define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
#define VDCTRL0_HALF_LINE (1 << 19)
#define VDCTRL0_HALF_LINE_MODE (1 << 18)
#define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
#define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
#define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
#define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
#define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
#define VDCTRL3_VSYNC_ONLY (1 << 28)
#define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
#define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
#define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
#define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
#define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */
#define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */
#define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
#define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
#define DEBUG0_HSYNC (1 < 26)
#define DEBUG0_VSYNC (1 < 25)
#define MIN_XRES 120
#define MIN_YRES 120
#define RED 0
#define GREEN 1
#define BLUE 2
#define TRANSP 3
#define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */
#define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */
#define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */
#define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */
#define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6)
#define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */
enum mxsfb_devtype {
MXSFB_V3,
MXSFB_V4,
};
/* CPU dependent register offsets */
struct mxsfb_devdata {
unsigned transfer_count;
unsigned cur_buf;
unsigned next_buf;
unsigned debug0;
unsigned hs_wdth_mask;
unsigned hs_wdth_shift;
unsigned ipversion;
};
struct mxsfb_info {
struct fb_info fb_info;
struct platform_device *pdev;
struct clk *clk;
struct clk *clk_axi;
struct clk *clk_disp_axi;
void __iomem *base; /* registers */
unsigned allocated_size;
int enabled;
unsigned ld_intf_width;
unsigned dotclk_delay;
const struct mxsfb_devdata *devdata;
u32 sync;
struct regulator *reg_lcd;
};
#define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
#define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
static const struct mxsfb_devdata mxsfb_devdata[] = {
[MXSFB_V3] = {
.transfer_count = LCDC_V3_TRANSFER_COUNT,
.cur_buf = LCDC_V3_CUR_BUF,
.next_buf = LCDC_V3_NEXT_BUF,
.debug0 = LCDC_V3_DEBUG0,
.hs_wdth_mask = 0xff,
.hs_wdth_shift = 24,
.ipversion = 3,
},
[MXSFB_V4] = {
.transfer_count = LCDC_V4_TRANSFER_COUNT,
.cur_buf = LCDC_V4_CUR_BUF,
.next_buf = LCDC_V4_NEXT_BUF,
.debug0 = LCDC_V4_DEBUG0,
.hs_wdth_mask = 0x3fff,
.hs_wdth_shift = 18,
.ipversion = 4,
},
};
#define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
/* mask and shift depends on architecture */
static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
{
return (val & host->devdata->hs_wdth_mask) <<
host->devdata->hs_wdth_shift;
}
static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
{
return (val >> host->devdata->hs_wdth_shift) &
host->devdata->hs_wdth_mask;
}
static const struct fb_bitfield def_rgb565[] = {
[RED] = {
.offset = 11,
.length = 5,
},
[GREEN] = {
.offset = 5,
.length = 6,
},
[BLUE] = {
.offset = 0,
.length = 5,
},
[TRANSP] = { /* no support for transparency */
.length = 0,
}
};
static const struct fb_bitfield def_rgb888[] = {
[RED] = {
.offset = 16,
.length = 8,
},
[GREEN] = {
.offset = 8,
.length = 8,
},
[BLUE] = {
.offset = 0,
.length = 8,
},
[TRANSP] = { /* no support for transparency */
.length = 0,
}
};
static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int mxsfb_check_var(struct fb_var_screeninfo *var,
struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
const struct fb_bitfield *rgb = NULL;
if (var->xres < MIN_XRES)
var->xres = MIN_XRES;
if (var->yres < MIN_YRES)
var->yres = MIN_YRES;
var->xres_virtual = var->xres;
var->yres_virtual = var->yres;
switch (var->bits_per_pixel) {
case 16:
/* always expect RGB 565 */
rgb = def_rgb565;
break;
case 32:
switch (host->ld_intf_width) {
case STMLCDIF_8BIT:
pr_debug("Unsupported LCD bus width mapping\n");
break;
case STMLCDIF_16BIT:
case STMLCDIF_18BIT:
case STMLCDIF_24BIT:
/* real 24 bit */
rgb = def_rgb888;
break;
}
break;
default:
pr_err("Unsupported colour depth: %u\n", var->bits_per_pixel);
return -EINVAL;
}
/*
* Copy the RGB parameters for this display
* from the machine specific parameters.
*/
var->red = rgb[RED];
var->green = rgb[GREEN];
var->blue = rgb[BLUE];
var->transp = rgb[TRANSP];
return 0;
}
static inline void mxsfb_enable_axi_clk(struct mxsfb_info *host)
{
if (host->clk_axi)
clk_prepare_enable(host->clk_axi);
}
static inline void mxsfb_disable_axi_clk(struct mxsfb_info *host)
{
if (host->clk_axi)
clk_disable_unprepare(host->clk_axi);
}
static void mxsfb_enable_controller(struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
u32 reg;
int ret;
dev_dbg(&host->pdev->dev, "%s\n", __func__);
if (host->reg_lcd) {
ret = regulator_enable(host->reg_lcd);
if (ret) {
dev_err(&host->pdev->dev,
"lcd regulator enable failed: %d\n", ret);
return;
}
}
if (host->clk_disp_axi)
clk_prepare_enable(host->clk_disp_axi);
clk_prepare_enable(host->clk);
clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
mxsfb_enable_axi_clk(host);
/* if it was disabled, re-enable the mode again */
writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
/* enable the SYNC signals first, then the DMA engine */
reg = readl(host->base + LCDC_VDCTRL4);
reg |= VDCTRL4_SYNC_SIGNALS_ON;
writel(reg, host->base + LCDC_VDCTRL4);
writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
host->enabled = 1;
}
static void mxsfb_disable_controller(struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
unsigned loop;
u32 reg;
int ret;
dev_dbg(&host->pdev->dev, "%s\n", __func__);
/*
* Even if we disable the controller here, it will still continue
* until its FIFOs are running out of data
*/
writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
loop = 1000;
while (loop) {
reg = readl(host->base + LCDC_CTRL);
if (!(reg & CTRL_RUN))
break;
loop--;
}
reg = readl(host->base + LCDC_VDCTRL4);
writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4);
mxsfb_disable_axi_clk(host);
clk_disable_unprepare(host->clk);
if (host->clk_disp_axi)
clk_disable_unprepare(host->clk_disp_axi);
host->enabled = 0;
if (host->reg_lcd) {
ret = regulator_disable(host->reg_lcd);
if (ret)
dev_err(&host->pdev->dev,
"lcd regulator disable failed: %d\n", ret);
}
}
static int mxsfb_set_par(struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
u32 ctrl, vdctrl0, vdctrl4;
int line_size, fb_size;
int reenable = 0;
line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
fb_size = fb_info->var.yres_virtual * line_size;
if (fb_size > fb_info->fix.smem_len)
return -ENOMEM;
fb_info->fix.line_length = line_size;
/*
* It seems, you can't re-program the controller if it is still running.
* This may lead into shifted pictures (FIFO issue?).
* So, first stop the controller and drain its FIFOs
*/
if (host->enabled) {
reenable = 1;
mxsfb_disable_controller(fb_info);
}
mxsfb_enable_axi_clk(host);
/* clear the FIFOs */
writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
CTRL_SET_BUS_WIDTH(host->ld_intf_width);
switch (fb_info->var.bits_per_pixel) {
case 16:
dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
ctrl |= CTRL_SET_WORD_LENGTH(0);
writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
break;
case 32:
dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
ctrl |= CTRL_SET_WORD_LENGTH(3);
switch (host->ld_intf_width) {
case STMLCDIF_8BIT:
mxsfb_disable_axi_clk(host);
dev_err(&host->pdev->dev,
"Unsupported LCD bus width mapping\n");
return -EINVAL;
case STMLCDIF_16BIT:
case STMLCDIF_18BIT:
case STMLCDIF_24BIT:
/* real 24 bit */
break;
}
/* do not use packed pixels = one pixel per word instead */
writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
break;
default:
mxsfb_disable_axi_clk(host);
dev_err(&host->pdev->dev, "Unhandled color depth of %u\n",
fb_info->var.bits_per_pixel);
return -EINVAL;
}
writel(ctrl, host->base + LCDC_CTRL);
writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
host->base + host->devdata->transfer_count);
vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */
VDCTRL0_VSYNC_PERIOD_UNIT |
VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT)
vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT)
vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
writel(vdctrl0, host->base + LCDC_VDCTRL0);
/* frame length in lines */
writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
fb_info->var.lower_margin + fb_info->var.yres,
host->base + LCDC_VDCTRL1);
/* line length in units of clocks or pixels */
writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
fb_info->var.hsync_len + fb_info->var.right_margin +
fb_info->var.xres),
host->base + LCDC_VDCTRL2);
writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
fb_info->var.hsync_len) |
SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
fb_info->var.vsync_len),
host->base + LCDC_VDCTRL3);
vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
if (mxsfb_is_v4(host))
vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
writel(vdctrl4, host->base + LCDC_VDCTRL4);
writel(fb_info->fix.smem_start +
fb_info->fix.line_length * fb_info->var.yoffset,
host->base + host->devdata->next_buf);
mxsfb_disable_axi_clk(host);
if (reenable)
mxsfb_enable_controller(fb_info);
return 0;
}
static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int transp, struct fb_info *fb_info)
{
unsigned int val;
int ret = -EINVAL;
/*
* If greyscale is true, then we convert the RGB value
* to greyscale no matter what visual we are using.
*/
if (fb_info->var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
switch (fb_info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
/*
* 12 or 16-bit True Colour. We encode the RGB value
* according to the RGB bitfield information.
*/
if (regno < 16) {
u32 *pal = fb_info->pseudo_palette;
val = chan_to_field(red, &fb_info->var.red);
val |= chan_to_field(green, &fb_info->var.green);
val |= chan_to_field(blue, &fb_info->var.blue);
pal[regno] = val;
ret = 0;
}
break;
case FB_VISUAL_STATIC_PSEUDOCOLOR:
case FB_VISUAL_PSEUDOCOLOR:
break;
}
return ret;
}
static int mxsfb_blank(int blank, struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
switch (blank) {
case FB_BLANK_POWERDOWN:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_NORMAL:
if (host->enabled)
mxsfb_disable_controller(fb_info);
break;
case FB_BLANK_UNBLANK:
if (!host->enabled)
mxsfb_enable_controller(fb_info);
break;
}
return 0;
}
static int mxsfb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *fb_info)
{
struct mxsfb_info *host = to_imxfb_host(fb_info);
unsigned offset;
if (var->xoffset != 0)
return -EINVAL;
offset = fb_info->fix.line_length * var->yoffset;
mxsfb_enable_axi_clk(host);
/* update on next VSYNC */
writel(fb_info->fix.smem_start + offset,
host->base + host->devdata->next_buf);
mxsfb_disable_axi_clk(host);
return 0;
}
static struct fb_ops mxsfb_ops = {
.owner = THIS_MODULE,
.fb_check_var = mxsfb_check_var,
.fb_set_par = mxsfb_set_par,
.fb_setcolreg = mxsfb_setcolreg,
.fb_blank = mxsfb_blank,
.fb_pan_display = mxsfb_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int mxsfb_restore_mode(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
struct fb_info *fb_info = &host->fb_info;
unsigned line_count;
unsigned period;
unsigned long pa, fbsize;
int bits_per_pixel, ofs, ret = 0;
u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
mxsfb_enable_axi_clk(host);
/* Only restore the mode when the controller is running */
ctrl = readl(host->base + LCDC_CTRL);
if (!(ctrl & CTRL_RUN)) {
ret = -EINVAL;
goto err;
}
vdctrl0 = readl(host->base + LCDC_VDCTRL0);
vdctrl2 = readl(host->base + LCDC_VDCTRL2);
vdctrl3 = readl(host->base + LCDC_VDCTRL3);
vdctrl4 = readl(host->base + LCDC_VDCTRL4);
transfer_count = readl(host->base + host->devdata->transfer_count);
vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
switch (CTRL_GET_WORD_LENGTH(ctrl)) {
case 0:
bits_per_pixel = 16;
break;
case 3:
bits_per_pixel = 32;
break;
case 1:
default:
ret = -EINVAL;
goto err;
}
fb_info->var.bits_per_pixel = bits_per_pixel;
vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2);
vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len;
vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) -
vmode->hsync_len - vmode->left_margin - vmode->xres;
vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
period = readl(host->base + LCDC_VDCTRL1);
vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len;
vmode->lower_margin = period - vmode->vsync_len -
vmode->upper_margin - vmode->yres;
vmode->vmode = FB_VMODE_NONINTERLACED;
vmode->sync = 0;
if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
vmode->sync |= FB_SYNC_HOR_HIGH_ACT;
if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
vmode->sync |= FB_SYNC_VERT_HIGH_ACT;
pr_debug("Reconstructed video mode:\n");
pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin,
vmode->right_margin, vmode->vsync_len, vmode->upper_margin,
vmode->lower_margin);
pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock));
host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3);
pa = readl(host->base + host->devdata->cur_buf);
fbsize = fb_info->fix.line_length * vmode->yres;
if (pa < fb_info->fix.smem_start) {
ret = -EINVAL;
goto err;
}
if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) {
ret = -EINVAL;
goto err;
}
ofs = pa - fb_info->fix.smem_start;
if (ofs) {
memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
}
line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
fb_info->fix.ypanstep = 1;
clk_prepare_enable(host->clk);
host->enabled = 1;
err:
if (ret)
mxsfb_disable_axi_clk(host);
return ret;
}
static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
struct fb_info *fb_info = &host->fb_info;
struct fb_var_screeninfo *var = &fb_info->var;
struct device *dev = &host->pdev->dev;
struct device_node *np = host->pdev->dev.of_node;
struct device_node *display_np;
struct videomode vm;
u32 width;
int ret;
display_np = of_parse_phandle(np, "display", 0);
if (!display_np) {
dev_err(dev, "failed to find display phandle\n");
return -ENOENT;
}
ret = of_property_read_u32(display_np, "bus-width", &width);
if (ret < 0) {
dev_err(dev, "failed to get property bus-width\n");
goto put_display_node;
}
switch (width) {
case 8:
host->ld_intf_width = STMLCDIF_8BIT;
break;
case 16:
host->ld_intf_width = STMLCDIF_16BIT;
break;
case 18:
host->ld_intf_width = STMLCDIF_18BIT;
break;
case 24:
host->ld_intf_width = STMLCDIF_24BIT;
break;
default:
dev_err(dev, "invalid bus-width value\n");
ret = -EINVAL;
goto put_display_node;
}
ret = of_property_read_u32(display_np, "bits-per-pixel",
&var->bits_per_pixel);
if (ret < 0) {
dev_err(dev, "failed to get property bits-per-pixel\n");
goto put_display_node;
}
ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
if (ret) {
dev_err(dev, "failed to get videomode from DT\n");
goto put_display_node;
}
ret = fb_videomode_from_videomode(&vm, vmode);
if (ret < 0)
goto put_display_node;
if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
put_display_node:
of_node_put(display_np);
return ret;
}
static int mxsfb_init_fbinfo(struct mxsfb_info *host,
struct fb_videomode *vmode)
{
int ret;
struct device *dev = &host->pdev->dev;
struct fb_info *fb_info = &host->fb_info;
struct fb_var_screeninfo *var = &fb_info->var;
dma_addr_t fb_phys;
void *fb_virt;
unsigned fb_size;
fb_info->fbops = &mxsfb_ops;
fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
fb_info->fix.ypanstep = 1;
fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
fb_info->fix.accel = FB_ACCEL_NONE;
ret = mxsfb_init_fbinfo_dt(host, vmode);
if (ret)
return ret;
var->nonstd = 0;
var->activate = FB_ACTIVATE_NOW;
var->accel_flags = 0;
var->vmode = FB_VMODE_NONINTERLACED;
/* Memory allocation for framebuffer */
fb_size = SZ_2M;
fb_virt = dma_alloc_wc(dev, PAGE_ALIGN(fb_size), &fb_phys, GFP_KERNEL);
if (!fb_virt)
return -ENOMEM;
fb_info->fix.smem_start = fb_phys;
fb_info->screen_base = fb_virt;
fb_info->screen_size = fb_info->fix.smem_len = fb_size;
if (mxsfb_restore_mode(host, vmode))
memset(fb_virt, 0, fb_size);
return 0;
}
static void mxsfb_free_videomem(struct mxsfb_info *host)
{
struct device *dev = &host->pdev->dev;
struct fb_info *fb_info = &host->fb_info;
dma_free_wc(dev, fb_info->screen_size, fb_info->screen_base,
fb_info->fix.smem_start);
}
static const struct platform_device_id mxsfb_devtype[] = {
{
.name = "imx23-fb",
.driver_data = MXSFB_V3,
}, {
.name = "imx28-fb",
.driver_data = MXSFB_V4,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
static const struct of_device_id mxsfb_dt_ids[] = {
{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
static int mxsfb_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(mxsfb_dt_ids, &pdev->dev);
struct resource *res;
struct mxsfb_info *host;
struct fb_info *fb_info;
struct fb_videomode *mode;
int ret;
if (of_id)
pdev->id_entry = of_id->data;
fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
if (!fb_info) {
dev_err(&pdev->dev, "Failed to allocate fbdev\n");
return -ENOMEM;
}
mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode),
GFP_KERNEL);
if (mode == NULL)
return -ENOMEM;
host = to_imxfb_host(fb_info);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(host->base)) {
ret = PTR_ERR(host->base);
goto fb_release;
}
host->pdev = pdev;
platform_set_drvdata(pdev, host);
host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
host->clk = devm_clk_get(&host->pdev->dev, NULL);
if (IS_ERR(host->clk)) {
ret = PTR_ERR(host->clk);
goto fb_release;
}
host->clk_axi = devm_clk_get(&host->pdev->dev, "axi");
if (IS_ERR(host->clk_axi))
host->clk_axi = NULL;
host->clk_disp_axi = devm_clk_get(&host->pdev->dev, "disp_axi");
if (IS_ERR(host->clk_disp_axi))
host->clk_disp_axi = NULL;
host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
if (IS_ERR(host->reg_lcd))
host->reg_lcd = NULL;
fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
GFP_KERNEL);
if (!fb_info->pseudo_palette) {
ret = -ENOMEM;
goto fb_release;
}
ret = mxsfb_init_fbinfo(host, mode);
if (ret != 0)
goto fb_release;
fb_videomode_to_var(&fb_info->var, mode);
/* init the color fields */
mxsfb_check_var(&fb_info->var, fb_info);
platform_set_drvdata(pdev, fb_info);
ret = register_framebuffer(fb_info);
if (ret != 0) {
dev_err(&pdev->dev,"Failed to register framebuffer\n");
goto fb_destroy;
}
if (!host->enabled) {
mxsfb_enable_axi_clk(host);
writel(0, host->base + LCDC_CTRL);
mxsfb_disable_axi_clk(host);
mxsfb_set_par(fb_info);
mxsfb_enable_controller(fb_info);
}
dev_info(&pdev->dev, "initialized\n");
return 0;
fb_destroy:
if (host->enabled)
clk_disable_unprepare(host->clk);
fb_release:
framebuffer_release(fb_info);
return ret;
}
static int mxsfb_remove(struct platform_device *pdev)
{
struct fb_info *fb_info = platform_get_drvdata(pdev);
struct mxsfb_info *host = to_imxfb_host(fb_info);
if (host->enabled)
mxsfb_disable_controller(fb_info);
unregister_framebuffer(fb_info);
mxsfb_free_videomem(host);
framebuffer_release(fb_info);
return 0;
}
static void mxsfb_shutdown(struct platform_device *pdev)
{
struct fb_info *fb_info = platform_get_drvdata(pdev);
struct mxsfb_info *host = to_imxfb_host(fb_info);
mxsfb_enable_axi_clk(host);
/*
* Force stop the LCD controller as keeping it running during reboot
* might interfere with the BootROM's boot mode pads sampling.
*/
writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
mxsfb_disable_axi_clk(host);
}
static struct platform_driver mxsfb_driver = {
.probe = mxsfb_probe,
.remove = mxsfb_remove,
.shutdown = mxsfb_shutdown,
.id_table = mxsfb_devtype,
.driver = {
.name = DRIVER_NAME,
.of_match_table = mxsfb_dt_ids,
},
};
module_platform_driver(mxsfb_driver);
MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");