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linux/drivers/video/da8xx-fb.c
Martin Ambrose 1f9c3e1f07 fbdev: da8xx/omap-l1xx: implement double buffering 
This work includes the following:

- Implement handler for FBIO_WAITFORVSYNC ioctl.

- Allocate the data and palette buffers separately.  A consequence of
  this is that the palette and data loading is now done in different
  phases.  And that the LCD must be disabled temporarily after the palette
  is loaded but this will only happen once after init and each time the
  palette is changed.  I think this is OK.

- Allocate two (ping and pong) framebuffers from memory.

- Add pan_display handler which toggles the LCDC DMA registers between
  the ping and pong buffers.

Signed-off-by: Martin Ambrose <martin@ti.com>
Cc: Chaithrika U S <chaithrika@ti.com>
Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-25 08:07:09 -07:00

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/*
* Copyright (C) 2008-2009 MontaVista Software Inc.
* Copyright (C) 2008-2009 Texas Instruments Inc
*
* Based on the LCD driver for TI Avalanche processors written by
* Ajay Singh and Shalom Hai.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/console.h>
#include <linux/slab.h>
#include <video/da8xx-fb.h>
#define DRIVER_NAME "da8xx_lcdc"
/* LCD Status Register */
#define LCD_END_OF_FRAME1 BIT(9)
#define LCD_END_OF_FRAME0 BIT(8)
#define LCD_PL_LOAD_DONE BIT(6)
#define LCD_FIFO_UNDERFLOW BIT(5)
#define LCD_SYNC_LOST BIT(2)
/* LCD DMA Control Register */
#define LCD_DMA_BURST_SIZE(x) ((x) << 4)
#define LCD_DMA_BURST_1 0x0
#define LCD_DMA_BURST_2 0x1
#define LCD_DMA_BURST_4 0x2
#define LCD_DMA_BURST_8 0x3
#define LCD_DMA_BURST_16 0x4
#define LCD_END_OF_FRAME_INT_ENA BIT(2)
#define LCD_DUAL_FRAME_BUFFER_ENABLE BIT(0)
/* LCD Control Register */
#define LCD_CLK_DIVISOR(x) ((x) << 8)
#define LCD_RASTER_MODE 0x01
/* LCD Raster Control Register */
#define LCD_PALETTE_LOAD_MODE(x) ((x) << 20)
#define PALETTE_AND_DATA 0x00
#define PALETTE_ONLY 0x01
#define DATA_ONLY 0x02
#define LCD_MONO_8BIT_MODE BIT(9)
#define LCD_RASTER_ORDER BIT(8)
#define LCD_TFT_MODE BIT(7)
#define LCD_UNDERFLOW_INT_ENA BIT(6)
#define LCD_PL_ENABLE BIT(4)
#define LCD_MONOCHROME_MODE BIT(1)
#define LCD_RASTER_ENABLE BIT(0)
#define LCD_TFT_ALT_ENABLE BIT(23)
#define LCD_STN_565_ENABLE BIT(24)
/* LCD Raster Timing 2 Register */
#define LCD_AC_BIAS_TRANSITIONS_PER_INT(x) ((x) << 16)
#define LCD_AC_BIAS_FREQUENCY(x) ((x) << 8)
#define LCD_SYNC_CTRL BIT(25)
#define LCD_SYNC_EDGE BIT(24)
#define LCD_INVERT_PIXEL_CLOCK BIT(22)
#define LCD_INVERT_LINE_CLOCK BIT(21)
#define LCD_INVERT_FRAME_CLOCK BIT(20)
/* LCD Block */
#define LCD_CTRL_REG 0x4
#define LCD_STAT_REG 0x8
#define LCD_RASTER_CTRL_REG 0x28
#define LCD_RASTER_TIMING_0_REG 0x2C
#define LCD_RASTER_TIMING_1_REG 0x30
#define LCD_RASTER_TIMING_2_REG 0x34
#define LCD_DMA_CTRL_REG 0x40
#define LCD_DMA_FRM_BUF_BASE_ADDR_0_REG 0x44
#define LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG 0x48
#define LCD_DMA_FRM_BUF_BASE_ADDR_1_REG 0x4C
#define LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG 0x50
#define LCD_NUM_BUFFERS 2
#define WSI_TIMEOUT 50
#define PALETTE_SIZE 256
#define LEFT_MARGIN 64
#define RIGHT_MARGIN 64
#define UPPER_MARGIN 32
#define LOWER_MARGIN 32
static resource_size_t da8xx_fb_reg_base;
static struct resource *lcdc_regs;
static inline unsigned int lcdc_read(unsigned int addr)
{
return (unsigned int)__raw_readl(da8xx_fb_reg_base + (addr));
}
static inline void lcdc_write(unsigned int val, unsigned int addr)
{
__raw_writel(val, da8xx_fb_reg_base + (addr));
}
struct da8xx_fb_par {
resource_size_t p_palette_base;
unsigned char *v_palette_base;
dma_addr_t vram_phys;
unsigned long vram_size;
void *vram_virt;
unsigned int dma_start;
unsigned int dma_end;
struct clk *lcdc_clk;
int irq;
unsigned short pseudo_palette[16];
unsigned int palette_sz;
unsigned int pxl_clk;
int blank;
wait_queue_head_t vsync_wait;
int vsync_flag;
int vsync_timeout;
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif
void (*panel_power_ctrl)(int);
};
/* Variable Screen Information */
static struct fb_var_screeninfo da8xx_fb_var __devinitdata = {
.xoffset = 0,
.yoffset = 0,
.transp = {0, 0, 0},
.nonstd = 0,
.activate = 0,
.height = -1,
.width = -1,
.pixclock = 46666, /* 46us - AUO display */
.accel_flags = 0,
.left_margin = LEFT_MARGIN,
.right_margin = RIGHT_MARGIN,
.upper_margin = UPPER_MARGIN,
.lower_margin = LOWER_MARGIN,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED
};
static struct fb_fix_screeninfo da8xx_fb_fix __devinitdata = {
.id = "DA8xx FB Drv",
.type = FB_TYPE_PACKED_PIXELS,
.type_aux = 0,
.visual = FB_VISUAL_PSEUDOCOLOR,
.xpanstep = 0,
.ypanstep = 1,
.ywrapstep = 0,
.accel = FB_ACCEL_NONE
};
struct da8xx_panel {
const char name[25]; /* Full name <vendor>_<model> */
unsigned short width;
unsigned short height;
int hfp; /* Horizontal front porch */
int hbp; /* Horizontal back porch */
int hsw; /* Horizontal Sync Pulse Width */
int vfp; /* Vertical front porch */
int vbp; /* Vertical back porch */
int vsw; /* Vertical Sync Pulse Width */
unsigned int pxl_clk; /* Pixel clock */
unsigned char invert_pxl_clk; /* Invert Pixel clock */
};
static struct da8xx_panel known_lcd_panels[] = {
/* Sharp LCD035Q3DG01 */
[0] = {
.name = "Sharp_LCD035Q3DG01",
.width = 320,
.height = 240,
.hfp = 8,
.hbp = 6,
.hsw = 0,
.vfp = 2,
.vbp = 2,
.vsw = 0,
.pxl_clk = 4608000,
.invert_pxl_clk = 1,
},
/* Sharp LK043T1DG01 */
[1] = {
.name = "Sharp_LK043T1DG01",
.width = 480,
.height = 272,
.hfp = 2,
.hbp = 2,
.hsw = 41,
.vfp = 2,
.vbp = 2,
.vsw = 10,
.pxl_clk = 7833600,
.invert_pxl_clk = 0,
},
};
/* Enable the Raster Engine of the LCD Controller */
static inline void lcd_enable_raster(void)
{
u32 reg;
reg = lcdc_read(LCD_RASTER_CTRL_REG);
if (!(reg & LCD_RASTER_ENABLE))
lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
}
/* Disable the Raster Engine of the LCD Controller */
static inline void lcd_disable_raster(void)
{
u32 reg;
reg = lcdc_read(LCD_RASTER_CTRL_REG);
if (reg & LCD_RASTER_ENABLE)
lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
}
static void lcd_blit(int load_mode, struct da8xx_fb_par *par)
{
u32 start;
u32 end;
u32 reg_ras;
u32 reg_dma;
/* init reg to clear PLM (loading mode) fields */
reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
reg_ras &= ~(3 << 20);
reg_dma = lcdc_read(LCD_DMA_CTRL_REG);
if (load_mode == LOAD_DATA) {
start = par->dma_start;
end = par->dma_end;
reg_ras |= LCD_PALETTE_LOAD_MODE(DATA_ONLY);
reg_dma |= LCD_END_OF_FRAME_INT_ENA;
reg_dma |= LCD_DUAL_FRAME_BUFFER_ENABLE;
lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
} else if (load_mode == LOAD_PALETTE) {
start = par->p_palette_base;
end = start + par->palette_sz - 1;
reg_ras |= LCD_PALETTE_LOAD_MODE(PALETTE_ONLY);
reg_ras |= LCD_PL_ENABLE;
lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
}
lcdc_write(reg_dma, LCD_DMA_CTRL_REG);
lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
/*
* The Raster enable bit must be set after all other control fields are
* set.
*/
lcd_enable_raster();
}
/* Configure the Burst Size of DMA */
static int lcd_cfg_dma(int burst_size)
{
u32 reg;
reg = lcdc_read(LCD_DMA_CTRL_REG) & 0x00000001;
switch (burst_size) {
case 1:
reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_1);
break;
case 2:
reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_2);
break;
case 4:
reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_4);
break;
case 8:
reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_8);
break;
case 16:
reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
break;
default:
return -EINVAL;
}
lcdc_write(reg, LCD_DMA_CTRL_REG);
return 0;
}
static void lcd_cfg_ac_bias(int period, int transitions_per_int)
{
u32 reg;
/* Set the AC Bias Period and Number of Transisitons per Interrupt */
reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & 0xFFF00000;
reg |= LCD_AC_BIAS_FREQUENCY(period) |
LCD_AC_BIAS_TRANSITIONS_PER_INT(transitions_per_int);
lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
}
static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
int front_porch)
{
u32 reg;
reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0xf;
reg |= ((back_porch & 0xff) << 24)
| ((front_porch & 0xff) << 16)
| ((pulse_width & 0x3f) << 10);
lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
}
static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,
int front_porch)
{
u32 reg;
reg = lcdc_read(LCD_RASTER_TIMING_1_REG) & 0x3ff;
reg |= ((back_porch & 0xff) << 24)
| ((front_porch & 0xff) << 16)
| ((pulse_width & 0x3f) << 10);
lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
}
static int lcd_cfg_display(const struct lcd_ctrl_config *cfg)
{
u32 reg;
reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(LCD_TFT_MODE |
LCD_MONO_8BIT_MODE |
LCD_MONOCHROME_MODE);
switch (cfg->p_disp_panel->panel_shade) {
case MONOCHROME:
reg |= LCD_MONOCHROME_MODE;
if (cfg->mono_8bit_mode)
reg |= LCD_MONO_8BIT_MODE;
break;
case COLOR_ACTIVE:
reg |= LCD_TFT_MODE;
if (cfg->tft_alt_mode)
reg |= LCD_TFT_ALT_ENABLE;
break;
case COLOR_PASSIVE:
if (cfg->stn_565_mode)
reg |= LCD_STN_565_ENABLE;
break;
default:
return -EINVAL;
}
/* enable additional interrupts here */
reg |= LCD_UNDERFLOW_INT_ENA;
lcdc_write(reg, LCD_RASTER_CTRL_REG);
reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
if (cfg->sync_ctrl)
reg |= LCD_SYNC_CTRL;
else
reg &= ~LCD_SYNC_CTRL;
if (cfg->sync_edge)
reg |= LCD_SYNC_EDGE;
else
reg &= ~LCD_SYNC_EDGE;
if (cfg->invert_line_clock)
reg |= LCD_INVERT_LINE_CLOCK;
else
reg &= ~LCD_INVERT_LINE_CLOCK;
if (cfg->invert_frm_clock)
reg |= LCD_INVERT_FRAME_CLOCK;
else
reg &= ~LCD_INVERT_FRAME_CLOCK;
lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
return 0;
}
static int lcd_cfg_frame_buffer(struct da8xx_fb_par *par, u32 width, u32 height,
u32 bpp, u32 raster_order)
{
u32 reg;
/* Set the Panel Width */
/* Pixels per line = (PPL + 1)*16 */
/*0x3F in bits 4..9 gives max horisontal resolution = 1024 pixels*/
width &= 0x3f0;
reg = lcdc_read(LCD_RASTER_TIMING_0_REG);
reg &= 0xfffffc00;
reg |= ((width >> 4) - 1) << 4;
lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
/* Set the Panel Height */
reg = lcdc_read(LCD_RASTER_TIMING_1_REG);
reg = ((height - 1) & 0x3ff) | (reg & 0xfffffc00);
lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
/* Set the Raster Order of the Frame Buffer */
reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(1 << 8);
if (raster_order)
reg |= LCD_RASTER_ORDER;
lcdc_write(reg, LCD_RASTER_CTRL_REG);
switch (bpp) {
case 1:
case 2:
case 4:
case 16:
par->palette_sz = 16 * 2;
break;
case 8:
par->palette_sz = 256 * 2;
break;
default:
return -EINVAL;
}
return 0;
}
static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
struct da8xx_fb_par *par = info->par;
unsigned short *palette = (unsigned short *) par->v_palette_base;
u_short pal;
int update_hw = 0;
if (regno > 255)
return 1;
if (info->fix.visual == FB_VISUAL_DIRECTCOLOR)
return 1;
if (info->var.bits_per_pixel == 8) {
red >>= 4;
green >>= 8;
blue >>= 12;
pal = (red & 0x0f00);
pal |= (green & 0x00f0);
pal |= (blue & 0x000f);
if (palette[regno] != pal) {
update_hw = 1;
palette[regno] = pal;
}
} else if ((info->var.bits_per_pixel == 16) && regno < 16) {
red >>= (16 - info->var.red.length);
red <<= info->var.red.offset;
green >>= (16 - info->var.green.length);
green <<= info->var.green.offset;
blue >>= (16 - info->var.blue.length);
blue <<= info->var.blue.offset;
par->pseudo_palette[regno] = red | green | blue;
if (palette[0] != 0x4000) {
update_hw = 1;
palette[0] = 0x4000;
}
}
/* Update the palette in the h/w as needed. */
if (update_hw)
lcd_blit(LOAD_PALETTE, par);
return 0;
}
static void lcd_reset(struct da8xx_fb_par *par)
{
/* Disable the Raster if previously Enabled */
lcd_disable_raster();
/* DMA has to be disabled */
lcdc_write(0, LCD_DMA_CTRL_REG);
lcdc_write(0, LCD_RASTER_CTRL_REG);
}
static void lcd_calc_clk_divider(struct da8xx_fb_par *par)
{
unsigned int lcd_clk, div;
lcd_clk = clk_get_rate(par->lcdc_clk);
div = lcd_clk / par->pxl_clk;
/* Configure the LCD clock divisor. */
lcdc_write(LCD_CLK_DIVISOR(div) |
(LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
}
static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
struct da8xx_panel *panel)
{
u32 bpp;
int ret = 0;
lcd_reset(par);
/* Calculate the divider */
lcd_calc_clk_divider(par);
if (panel->invert_pxl_clk)
lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |
LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
else
lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) &
~LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
/* Configure the DMA burst size. */
ret = lcd_cfg_dma(cfg->dma_burst_sz);
if (ret < 0)
return ret;
/* Configure the AC bias properties. */
lcd_cfg_ac_bias(cfg->ac_bias, cfg->ac_bias_intrpt);
/* Configure the vertical and horizontal sync properties. */
lcd_cfg_vertical_sync(panel->vbp, panel->vsw, panel->vfp);
lcd_cfg_horizontal_sync(panel->hbp, panel->hsw, panel->hfp);
/* Configure for disply */
ret = lcd_cfg_display(cfg);
if (ret < 0)
return ret;
if (QVGA != cfg->p_disp_panel->panel_type)
return -EINVAL;
if (cfg->bpp <= cfg->p_disp_panel->max_bpp &&
cfg->bpp >= cfg->p_disp_panel->min_bpp)
bpp = cfg->bpp;
else
bpp = cfg->p_disp_panel->max_bpp;
if (bpp == 12)
bpp = 16;
ret = lcd_cfg_frame_buffer(par, (unsigned int)panel->width,
(unsigned int)panel->height, bpp,
cfg->raster_order);
if (ret < 0)
return ret;
/* Configure FDD */
lcdc_write((lcdc_read(LCD_RASTER_CTRL_REG) & 0xfff00fff) |
(cfg->fdd << 12), LCD_RASTER_CTRL_REG);
return 0;
}
static irqreturn_t lcdc_irq_handler(int irq, void *arg)
{
struct da8xx_fb_par *par = arg;
u32 stat = lcdc_read(LCD_STAT_REG);
u32 reg_ras;
if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
lcd_disable_raster();
lcdc_write(stat, LCD_STAT_REG);
lcd_enable_raster();
} else if (stat & LCD_PL_LOAD_DONE) {
/*
* Must disable raster before changing state of any control bit.
* And also must be disabled before clearing the PL loading
* interrupt via the following write to the status register. If
* this is done after then one gets multiple PL done interrupts.
*/
lcd_disable_raster();
lcdc_write(stat, LCD_STAT_REG);
/* Disable PL completion inerrupt */
reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
reg_ras &= ~LCD_PL_ENABLE;
lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
/* Setup and start data loading mode */
lcd_blit(LOAD_DATA, par);
} else {
lcdc_write(stat, LCD_STAT_REG);
if (stat & LCD_END_OF_FRAME0) {
lcdc_write(par->dma_start,
LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
lcdc_write(par->dma_end,
LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
par->vsync_flag = 1;
wake_up_interruptible(&par->vsync_wait);
}
if (stat & LCD_END_OF_FRAME1) {
lcdc_write(par->dma_start,
LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
lcdc_write(par->dma_end,
LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
par->vsync_flag = 1;
wake_up_interruptible(&par->vsync_wait);
}
}
return IRQ_HANDLED;
}
static int fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
int err = 0;
switch (var->bits_per_pixel) {
case 1:
case 8:
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 0;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 4:
var->red.offset = 0;
var->red.length = 4;
var->green.offset = 0;
var->green.length = 4;
var->blue.offset = 0;
var->blue.length = 4;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 16: /* RGB 565 */
var->red.offset = 11;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 6;
var->blue.offset = 0;
var->blue.length = 5;
var->transp.offset = 0;
var->transp.length = 0;
break;
default:
err = -EINVAL;
}
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
var->transp.msb_right = 0;
return err;
}
#ifdef CONFIG_CPU_FREQ
static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
unsigned long val, void *data)
{
struct da8xx_fb_par *par;
par = container_of(nb, struct da8xx_fb_par, freq_transition);
if (val == CPUFREQ_PRECHANGE) {
lcd_disable_raster();
} else if (val == CPUFREQ_POSTCHANGE) {
lcd_calc_clk_divider(par);
lcd_enable_raster();
}
return 0;
}
static inline int lcd_da8xx_cpufreq_register(struct da8xx_fb_par *par)
{
par->freq_transition.notifier_call = lcd_da8xx_cpufreq_transition;
return cpufreq_register_notifier(&par->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
static inline void lcd_da8xx_cpufreq_deregister(struct da8xx_fb_par *par)
{
cpufreq_unregister_notifier(&par->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
}
#endif
static int __devexit fb_remove(struct platform_device *dev)
{
struct fb_info *info = dev_get_drvdata(&dev->dev);
if (info) {
struct da8xx_fb_par *par = info->par;
#ifdef CONFIG_CPU_FREQ
lcd_da8xx_cpufreq_deregister(par);
#endif
if (par->panel_power_ctrl)
par->panel_power_ctrl(0);
lcd_disable_raster();
lcdc_write(0, LCD_RASTER_CTRL_REG);
/* disable DMA */
lcdc_write(0, LCD_DMA_CTRL_REG);
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
par->p_palette_base);
dma_free_coherent(NULL, par->vram_size, par->vram_virt,
par->vram_phys);
free_irq(par->irq, par);
clk_disable(par->lcdc_clk);
clk_put(par->lcdc_clk);
framebuffer_release(info);
iounmap((void __iomem *)da8xx_fb_reg_base);
release_mem_region(lcdc_regs->start, resource_size(lcdc_regs));
}
return 0;
}
/*
* Function to wait for vertical sync which for this LCD peripheral
* translates into waiting for the current raster frame to complete.
*/
static int fb_wait_for_vsync(struct fb_info *info)
{
struct da8xx_fb_par *par = info->par;
int ret;
/*
* Set flag to 0 and wait for isr to set to 1. It would seem there is a
* race condition here where the ISR could have occured just before or
* just after this set. But since we are just coarsely waiting for
* a frame to complete then that's OK. i.e. if the frame completed
* just before this code executed then we have to wait another full
* frame time but there is no way to avoid such a situation. On the
* other hand if the frame completed just after then we don't need
* to wait long at all. Either way we are guaranteed to return to the
* user immediately after a frame completion which is all that is
* required.
*/
par->vsync_flag = 0;
ret = wait_event_interruptible_timeout(par->vsync_wait,
par->vsync_flag != 0,
par->vsync_timeout);
if (ret < 0)
return ret;
if (ret == 0)
return -ETIMEDOUT;
return 0;
}
static int fb_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
struct lcd_sync_arg sync_arg;
switch (cmd) {
case FBIOGET_CONTRAST:
case FBIOPUT_CONTRAST:
case FBIGET_BRIGHTNESS:
case FBIPUT_BRIGHTNESS:
case FBIGET_COLOR:
case FBIPUT_COLOR:
return -ENOTTY;
case FBIPUT_HSYNC:
if (copy_from_user(&sync_arg, (char *)arg,
sizeof(struct lcd_sync_arg)))
return -EFAULT;
lcd_cfg_horizontal_sync(sync_arg.back_porch,
sync_arg.pulse_width,
sync_arg.front_porch);
break;
case FBIPUT_VSYNC:
if (copy_from_user(&sync_arg, (char *)arg,
sizeof(struct lcd_sync_arg)))
return -EFAULT;
lcd_cfg_vertical_sync(sync_arg.back_porch,
sync_arg.pulse_width,
sync_arg.front_porch);
break;
case FBIO_WAITFORVSYNC:
return fb_wait_for_vsync(info);
default:
return -EINVAL;
}
return 0;
}
static int cfb_blank(int blank, struct fb_info *info)
{
struct da8xx_fb_par *par = info->par;
int ret = 0;
if (par->blank == blank)
return 0;
par->blank = blank;
switch (blank) {
case FB_BLANK_UNBLANK:
if (par->panel_power_ctrl)
par->panel_power_ctrl(1);
lcd_enable_raster();
break;
case FB_BLANK_POWERDOWN:
if (par->panel_power_ctrl)
par->panel_power_ctrl(0);
lcd_disable_raster();
break;
default:
ret = -EINVAL;
}
return ret;
}
/*
* Set new x,y offsets in the virtual display for the visible area and switch
* to the new mode.
*/
static int da8xx_pan_display(struct fb_var_screeninfo *var,
struct fb_info *fbi)
{
int ret = 0;
struct fb_var_screeninfo new_var;
struct da8xx_fb_par *par = fbi->par;
struct fb_fix_screeninfo *fix = &fbi->fix;
unsigned int end;
unsigned int start;
if (var->xoffset != fbi->var.xoffset ||
var->yoffset != fbi->var.yoffset) {
memcpy(&new_var, &fbi->var, sizeof(new_var));
new_var.xoffset = var->xoffset;
new_var.yoffset = var->yoffset;
if (fb_check_var(&new_var, fbi))
ret = -EINVAL;
else {
memcpy(&fbi->var, &new_var, sizeof(new_var));
start = fix->smem_start +
new_var.yoffset * fix->line_length +
new_var.xoffset * var->bits_per_pixel / 8;
end = start + var->yres * fix->line_length - 1;
par->dma_start = start;
par->dma_end = end;
}
}
return ret;
}
static struct fb_ops da8xx_fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = fb_check_var,
.fb_setcolreg = fb_setcolreg,
.fb_pan_display = da8xx_pan_display,
.fb_ioctl = fb_ioctl,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_blank = cfb_blank,
};
static int __init fb_probe(struct platform_device *device)
{
struct da8xx_lcdc_platform_data *fb_pdata =
device->dev.platform_data;
struct lcd_ctrl_config *lcd_cfg;
struct da8xx_panel *lcdc_info;
struct fb_info *da8xx_fb_info;
struct clk *fb_clk = NULL;
struct da8xx_fb_par *par;
resource_size_t len;
int ret, i;
if (fb_pdata == NULL) {
dev_err(&device->dev, "Can not get platform data\n");
return -ENOENT;
}
lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
if (!lcdc_regs) {
dev_err(&device->dev,
"Can not get memory resource for LCD controller\n");
return -ENOENT;
}
len = resource_size(lcdc_regs);
lcdc_regs = request_mem_region(lcdc_regs->start, len, lcdc_regs->name);
if (!lcdc_regs)
return -EBUSY;
da8xx_fb_reg_base = (resource_size_t)ioremap(lcdc_regs->start, len);
if (!da8xx_fb_reg_base) {
ret = -EBUSY;
goto err_request_mem;
}
fb_clk = clk_get(&device->dev, NULL);
if (IS_ERR(fb_clk)) {
dev_err(&device->dev, "Can not get device clock\n");
ret = -ENODEV;
goto err_ioremap;
}
ret = clk_enable(fb_clk);
if (ret)
goto err_clk_put;
for (i = 0, lcdc_info = known_lcd_panels;
i < ARRAY_SIZE(known_lcd_panels);
i++, lcdc_info++) {
if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
break;
}
if (i == ARRAY_SIZE(known_lcd_panels)) {
dev_err(&device->dev, "GLCD: No valid panel found\n");
ret = -ENODEV;
goto err_clk_disable;
} else
dev_info(&device->dev, "GLCD: Found %s panel\n",
fb_pdata->type);
lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
da8xx_fb_info = framebuffer_alloc(sizeof(struct da8xx_fb_par),
&device->dev);
if (!da8xx_fb_info) {
dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
ret = -ENOMEM;
goto err_clk_disable;
}
par = da8xx_fb_info->par;
par->lcdc_clk = fb_clk;
par->pxl_clk = lcdc_info->pxl_clk;
if (fb_pdata->panel_power_ctrl) {
par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
par->panel_power_ctrl(1);
}
if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
dev_err(&device->dev, "lcd_init failed\n");
ret = -EFAULT;
goto err_release_fb;
}
/* allocate frame buffer */
par->vram_size = lcdc_info->width * lcdc_info->height * lcd_cfg->bpp;
par->vram_size = PAGE_ALIGN(par->vram_size/8);
par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
par->vram_virt = dma_alloc_coherent(NULL,
par->vram_size,
(resource_size_t *) &par->vram_phys,
GFP_KERNEL | GFP_DMA);
if (!par->vram_virt) {
dev_err(&device->dev,
"GLCD: kmalloc for frame buffer failed\n");
ret = -EINVAL;
goto err_release_fb;
}
da8xx_fb_info->screen_base = (char __iomem *) par->vram_virt;
da8xx_fb_fix.smem_start = par->vram_phys;
da8xx_fb_fix.smem_len = par->vram_size;
da8xx_fb_fix.line_length = (lcdc_info->width * lcd_cfg->bpp) / 8;
par->dma_start = par->vram_phys;
par->dma_end = par->dma_start + lcdc_info->height *
da8xx_fb_fix.line_length - 1;
/* allocate palette buffer */
par->v_palette_base = dma_alloc_coherent(NULL,
PALETTE_SIZE,
(resource_size_t *)
&par->p_palette_base,
GFP_KERNEL | GFP_DMA);
if (!par->v_palette_base) {
dev_err(&device->dev,
"GLCD: kmalloc for palette buffer failed\n");
ret = -EINVAL;
goto err_release_fb_mem;
}
memset(par->v_palette_base, 0, PALETTE_SIZE);
par->irq = platform_get_irq(device, 0);
if (par->irq < 0) {
ret = -ENOENT;
goto err_release_pl_mem;
}
ret = request_irq(par->irq, lcdc_irq_handler, 0, DRIVER_NAME, par);
if (ret)
goto err_release_pl_mem;
/* Initialize par */
da8xx_fb_info->var.bits_per_pixel = lcd_cfg->bpp;
da8xx_fb_var.xres = lcdc_info->width;
da8xx_fb_var.xres_virtual = lcdc_info->width;
da8xx_fb_var.yres = lcdc_info->height;
da8xx_fb_var.yres_virtual = lcdc_info->height * LCD_NUM_BUFFERS;
da8xx_fb_var.grayscale =
lcd_cfg->p_disp_panel->panel_shade == MONOCHROME ? 1 : 0;
da8xx_fb_var.bits_per_pixel = lcd_cfg->bpp;
da8xx_fb_var.hsync_len = lcdc_info->hsw;
da8xx_fb_var.vsync_len = lcdc_info->vsw;
/* Initialize fbinfo */
da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;
da8xx_fb_info->fix = da8xx_fb_fix;
da8xx_fb_info->var = da8xx_fb_var;
da8xx_fb_info->fbops = &da8xx_fb_ops;
da8xx_fb_info->pseudo_palette = par->pseudo_palette;
da8xx_fb_info->fix.visual = (da8xx_fb_info->var.bits_per_pixel <= 8) ?
FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
ret = fb_alloc_cmap(&da8xx_fb_info->cmap, PALETTE_SIZE, 0);
if (ret)
goto err_free_irq;
da8xx_fb_info->cmap.len = par->palette_sz;
/* initialize var_screeninfo */
da8xx_fb_var.activate = FB_ACTIVATE_FORCE;
fb_set_var(da8xx_fb_info, &da8xx_fb_var);
dev_set_drvdata(&device->dev, da8xx_fb_info);
/* initialize the vsync wait queue */
init_waitqueue_head(&par->vsync_wait);
par->vsync_timeout = HZ / 5;
/* Register the Frame Buffer */
if (register_framebuffer(da8xx_fb_info) < 0) {
dev_err(&device->dev,
"GLCD: Frame Buffer Registration Failed!\n");
ret = -EINVAL;
goto err_dealloc_cmap;
}
#ifdef CONFIG_CPU_FREQ
ret = lcd_da8xx_cpufreq_register(par);
if (ret) {
dev_err(&device->dev, "failed to register cpufreq\n");
goto err_cpu_freq;
}
#endif
return 0;
#ifdef CONFIG_CPU_FREQ
err_cpu_freq:
unregister_framebuffer(da8xx_fb_info);
#endif
err_dealloc_cmap:
fb_dealloc_cmap(&da8xx_fb_info->cmap);
err_free_irq:
free_irq(par->irq, par);
err_release_pl_mem:
dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
par->p_palette_base);
err_release_fb_mem:
dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
err_release_fb:
framebuffer_release(da8xx_fb_info);
err_clk_disable:
clk_disable(fb_clk);
err_clk_put:
clk_put(fb_clk);
err_ioremap:
iounmap((void __iomem *)da8xx_fb_reg_base);
err_request_mem:
release_mem_region(lcdc_regs->start, len);
return ret;
}
#ifdef CONFIG_PM
static int fb_suspend(struct platform_device *dev, pm_message_t state)
{
struct fb_info *info = platform_get_drvdata(dev);
struct da8xx_fb_par *par = info->par;
acquire_console_sem();
if (par->panel_power_ctrl)
par->panel_power_ctrl(0);
fb_set_suspend(info, 1);
lcd_disable_raster();
clk_disable(par->lcdc_clk);
release_console_sem();
return 0;
}
static int fb_resume(struct platform_device *dev)
{
struct fb_info *info = platform_get_drvdata(dev);
struct da8xx_fb_par *par = info->par;
acquire_console_sem();
if (par->panel_power_ctrl)
par->panel_power_ctrl(1);
clk_enable(par->lcdc_clk);
lcd_enable_raster();
fb_set_suspend(info, 0);
release_console_sem();
return 0;
}
#else
#define fb_suspend NULL
#define fb_resume NULL
#endif
static struct platform_driver da8xx_fb_driver = {
.probe = fb_probe,
.remove = fb_remove,
.suspend = fb_suspend,
.resume = fb_resume,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init da8xx_fb_init(void)
{
return platform_driver_register(&da8xx_fb_driver);
}
static void __exit da8xx_fb_cleanup(void)
{
platform_driver_unregister(&da8xx_fb_driver);
}
module_init(da8xx_fb_init);
module_exit(da8xx_fb_cleanup);
MODULE_DESCRIPTION("Framebuffer driver for TI da8xx/omap-l1xx");
MODULE_AUTHOR("Texas Instruments");
MODULE_LICENSE("GPL");
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