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da8xx-fb.c
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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;