/*
* linux/drivers/video/pxafb.c
*
* Copyright (C) 1999 Eric A. Thomas.
* Copyright (C) 2004 Jean-Frederic Clere.
* Copyright (C) 2004 Ian Campbell.
* Copyright (C) 2004 Jeff Lackey.
* Based on sa1100fb.c Copyright (C) 1999 Eric A. Thomas
* which in turn is
* Based on acornfb.c Copyright (C) Russell King.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* Intel PXA250/210 LCD Controller Frame Buffer Driver
*
* Please direct your questions and comments on this driver to the following
* email address:
*
* linux-arm-kernel@lists.arm.linux.org.uk
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/bitfield.h>
#include <asm/arch/pxafb.h>
/*
* Complain if VAR is out of range.
*/
#define DEBUG_VAR 1
#include "pxafb.h"
/* Bits which should not be set in machine configuration structures */
#define LCCR0_INVALID_CONFIG_MASK (LCCR0_OUM|LCCR0_BM|LCCR0_QDM|LCCR0_DIS|LCCR0_EFM|LCCR0_IUM|LCCR0_SFM|LCCR0_LDM|LCCR0_ENB)
#define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP|LCCR3_VSP|LCCR3_PCD|LCCR3_BPP)
static void (*pxafb_backlight_power)(int);
static void (*pxafb_lcd_power)(int);
static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *);
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);
#ifdef CONFIG_FB_PXA_PARAMETERS
#define PXAFB_OPTIONS_SIZE 256
static char g_options[PXAFB_OPTIONS_SIZE] __initdata = "";
#endif
static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state)
{
unsigned long flags;
local_irq_save(flags);
/*
* We need to handle two requests being made at the same time.
* There are two important cases:
* 1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
* We must perform the unblanking, which will do our REENABLE for us.
* 2. When we are blanking, but immediately unblank before we have
* blanked. We do the "REENABLE" thing here as well, just to be sure.
*/
if (fbi->task_state == C_ENABLE && state == C_REENABLE)
state = (u_int) -1;
if (fbi->task_state == C_DISABLE && state == C_ENABLE)
state = C_REENABLE;
if (state != (u_int)-1) {
fbi->task_state = state;
schedule_work(&fbi->task);
}
local_irq_restore(flags);
}
static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int
pxafb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
u_int val, ret = 1;
if (regno < fbi->palette_size) {
if (fbi->fb.var.grayscale) {
val = ((blue >> 8) & 0x00ff);
} else {
val = ((red >> 0) & 0xf800);
val |= ((green >> 5) & 0x07e0);
val |= ((blue >> 11) & 0x001f);
}
fbi->palette_cpu[regno] = val;
ret = 0;
}
return ret;
}
static int
pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
unsigned int val;
int ret = 1;
/*
* If inverse mode was selected, invert all the colours
* rather than the register number. The register number
* is what you poke into the framebuffer to produce the
* colour you requested.
*/
if (fbi->cmap_inverse) {
red = 0xffff - red;
green = 0xffff - green;
blue = 0xffff - blue;
}
/*
* If greyscale is true, then we convert the RGB value
* to greyscale no matter what visual we are using.
*/
if (fbi->fb.var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
switch (fbi->fb.fix.visual) {
case FB_VISUAL_TRUECOLOR:
/*
* 16-bit True Colour. We encode the RGB value
* according to the RGB bitfield information.
*/
if (regno < 16) {
u32 *pal = fbi->fb.pseudo_palette;
val = chan_to_field(red, &fbi->fb.var.red);
val |= chan_to_field(green, &fbi->fb.var.green);
val |= chan_to_field(blue, &fbi->fb.var.blue);
pal[regno] = val;
ret = 0;
}
break;
case FB_VISUAL_STATIC_PSEUDOCOLOR:
case FB_VISUAL_PSEUDOCOLOR:
ret = pxafb_setpalettereg(regno, red, green, blue, trans, info);
break;
}
return ret;
}
/*
* pxafb_bpp_to_lccr3():
* Convert a bits per pixel value to the correct bit pattern for LCCR3
*/
static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var)
{
int ret = 0;
switch (var->bits_per_pixel) {
case 1: ret = LCCR3_1BPP; break;
case 2: ret = LCCR3_2BPP; break;
case 4: ret = LCCR3_4BPP; break;
case 8: ret = LCCR3_8BPP; break;
case 16: ret = LCCR3_16BPP; break;
}
return ret;
}
#ifdef CONFIG_CPU_FREQ
/*
* pxafb_display_dma_period()
* Calculate the minimum period (in picoseconds) between two DMA
* requests for the LCD controller. If we hit this, it means we're
* doing nothing but LCD DMA.
*/
static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var)
{
/*
* Period = pixclock * bits_per_byte * bytes_per_transfer
* / memory_bits_per_pixel;
*/
return var->pixclock * 8 * 16 / var->bits_per_pixel;
}
extern unsigned int get_clk_frequency_khz(int info);
#endif
/*
* pxafb_check_var():
* Get the video params out of 'var'. If a value doesn't fit, round it up,
* if it's too big, return -EINVAL.
*
* Round up in the following order: bits_per_pixel, xres,
* yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
* bitfields, horizontal timing, vertical timing.
*/
static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
if (var->xres < MIN_XRES)
var->xres = MIN_XRES;
if (var->yres < MIN_YRES)
var->yres = MIN_YRES;
if (var->xres > fbi->max_xres)
var->xres = fbi->max_xres;
if (var->yres > fbi->max_yres)
var->yres = fbi->max_yres;
var->xres_virtual =
max(var->xres_virtual, var->xres);
var->yres_virtual =
max(var->yres_virtual, var->yres);
/*
* Setup the RGB parameters for this display.
*
* The pixel packing format is described on page 7-11 of the
* PXA2XX Developer's Manual.
*/
if (var->bits_per_pixel == 16) {
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 = var->transp.length = 0;
} else {
var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 0;
}
#ifdef CONFIG_CPU_FREQ
DPRINTK("dma period = %d ps, clock = %d kHz\n",
pxafb_display_dma_period(var),
get_clk_frequency_khz(0));
#endif
return 0;
}
static inline void pxafb_set_truecolor(u_int is_true_color)
{
DPRINTK("true_color = %d\n", is_true_color);
// do your machine-specific setup if needed
}
/*
* pxafb_set_par():
* Set the user defined part of the display for the specified console
*/
static int pxafb_set_par(struct fb_info *info)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
struct fb_var_screeninfo *var = &info->var;
unsigned long palette_mem_size;
DPRINTK("set_par\n");
if (var->bits_per_pixel == 16)
fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
else if (!fbi->cmap_static)
fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
else {
/*
* Some people have weird ideas about wanting static
* pseudocolor maps. I suspect their user space
* applications are broken.
*/
fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
}
fbi->fb.fix.line_length = var->xres_virtual *
var->bits_per_pixel / 8;
if (var->bits_per_pixel == 16)
fbi->palette_size = 0;
else
fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel;
palette_mem_size = fbi->palette_size * sizeof(u16);
DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);
fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
/*
* Set (any) board control register to handle new color depth
*/
pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);
if (fbi->fb.var.bits_per_pixel == 16)
fb_dealloc_cmap(&fbi->fb.cmap);
else
fb_alloc_cmap(&fbi->fb.cmap, 1<<fbi->fb.var.bits_per_pixel, 0);
pxafb_activate_var(var, fbi);
return 0;
}
/*
* Formal definition of the VESA spec:
* On
* This refers to the state of the display when it is in full operation
* Stand-By
* This defines an optional operating state of minimal power reduction with
* the shortest recovery time
* Suspend
* This refers to a level of power management in which substantial power
* reduction is achieved by the display. The display can have a longer
* recovery time from this state than from the Stand-by state
* Off
* This indicates that the display is consuming the lowest level of power
* and is non-operational. Recovery from this state may optionally require
* the user to manually power on the monitor
*
* Now, the fbdev driver adds an additional state, (blank), where they
* turn off the video (maybe by colormap tricks), but don't mess with the
* video itself: think of it semantically between on and Stand-By.
*
* So here's what we should do in our fbdev blank routine:
*
* VESA_NO_BLANKING (mode 0) Video on, front/back light on
* VESA_VSYNC_SUSPEND (mode 1) Video on, front/back light off
* VESA_HSYNC_SUSPEND (mode 2) Video on, front/back light off
* VESA_POWERDOWN (mode 3) Video off, front/back light off
*
* This will match the matrox implementation.
*/
/*
* pxafb_blank():
* Blank the display by setting all palette values to zero. Note, the
* 16 bpp mode does not really use the palette, so this will not
* blank the display in all modes.
*/
static int pxafb_blank(int blank, struct fb_info *info)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
int i;
DPRINTK("pxafb_blank: blank=%d\n", blank);
switch (blank) {
case FB_BLANK_POWERDOWN:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_NORMAL:
if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
for (i = 0; i < fbi->palette_size; i++)
pxafb_setpalettereg(i, 0, 0, 0, 0, info);
pxafb_schedule_work(fbi, C_DISABLE);
//TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
break;
case FB_BLANK_UNBLANK:
//TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
fb_set_cmap(&fbi->fb.cmap, info);
pxafb_schedule_work(fbi, C_ENABLE);
}
return 0;
}
static int pxafb_mmap(struct fb_info *info, struct file *file,
struct vm_area_struct *vma)
{
struct pxafb_info *fbi = (struct pxafb_info *)info;
unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
if (off < info->fix.smem_len) {
vma->vm_pgoff += 1;
return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
fbi->map_dma, fbi->map_size);
}
return -EINVAL;
}
static struct fb_ops pxafb_ops = {
.owner = THIS_MODULE,
.fb_check_var = pxafb_check_var,
.fb_set_par = pxafb_set_par,
.fb_setcolreg = pxafb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_blank = pxafb_blank,
.fb_cursor = soft_cursor,
.fb_mmap = pxafb_mmap,
};
/*
* Calculate the PCD value from the clock rate (in picoseconds).
* We take account of the PPCR clock setting.
* From PXA Developer's Manual:
*
* PixelClock = LCLK
* -------------
* 2 ( PCD + 1 )
*
* PCD = LCLK
* ------------- - 1
* 2(PixelClock)
*
* Where:
* LCLK = LCD/Memory Clock
* PCD = LCCR3[7:0]
*
* PixelClock here is in Hz while the pixclock argument given is the
* period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 )
*
* The function get_lclk_frequency_10khz returns LCLK in units of
* 10khz. Calling the result of this function lclk gives us the
* following
*
* PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 )
* -------------------------------------- - 1
* 2
*
* Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below.
*/
static inline unsigned int get_pcd(unsigned int pixclock)
{
unsigned long long pcd;
/* FIXME: Need to take into account Double Pixel Clock mode
* (DPC) bit? or perhaps set it based on the various clock
* speeds */
pcd = (unsigned long long)get_lcdclk_frequency_10khz() * pixclock;
do_div(pcd, 100000000 * 2);
/* no need for this, since we should subtract 1 anyway. they cancel */
/* pcd += 1; */ /* make up for integer math truncations */
return (unsigned int)pcd;
}
/*
* pxafb_activate_var():
* Configures LCD Controller based on entries in var parameter. Settings are
* only written to the controller if changes were made.
*/
static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi)
{
struct pxafb_lcd_reg new_regs;
u_long flags;
u_int lines_per_panel, pcd = get_pcd(var->pixclock);
DPRINTK("Configuring PXA LCD\n");
DPRINTK("var: xres=%d hslen=%d lm=%d rm=%d\n",
var->xres, var->hsync_len,
var->left_margin, var->right_margin);
DPRINTK("var: yres=%d vslen=%d um=%d bm=%d\n",
var->yres, var->vsync_len,
var->upper_margin, var->lower_margin);
DPRINTK("var: pixclock=%d pcd=%d\n", var->pixclock, pcd);
#if DEBUG_VAR
if (var->xres < 16 || var->xres > 1024)
printk(KERN_ERR "%s: invalid xres %d\n",
fbi->fb.fix.id, var->xres);
switch(var->bits_per_pixel) {
case 1:
case 2:
case 4:
case 8:
case 16:
break;
default:
printk(KERN_ERR "%s: invalid bit depth %d\n",
fbi->fb.fix.id, var->bits_per_pixel);
break;
}
if (var->hsync_len < 1 || var->hsync_len > 64)
printk(KERN_ERR "%s: invalid hsync_len %d\n",
fbi->fb.fix.id, var->hsync_len);
if (var->left_margin < 1 || var->left_margin > 255)
printk(KERN_ERR "%s: invalid left_margin %d\n",
fbi->fb.fix.id, var->left_margin);
if (var->right_margin < 1 || var->right_margin > 255)
printk(KERN_ERR "%s: invalid right_margin %d\n",
fbi->fb.fix.id, var->right_margin);
if (var->yres < 1 || var->yres > 1024)
printk(KERN_ERR "%s: invalid yres %d\n",
fbi->fb.fix.id, var->yres);
if (var->vsync_len < 1 || var->vsync_len > 64)
printk(KERN_ERR "%s: invalid vsync_len %d\n",
fbi->fb.fix.id, var->vsync_len);
if (var->upper_margin < 0 || var->upper_margin > 255)
printk(KERN_ERR "%s: invalid upper_margin %d\n",
fbi->fb.fix.id, var->upper_margin);
if (var->lower_margin < 0 || var->lower_margin > 255)
printk(KERN_ERR "%s: invalid lower_margin %d\n",
fbi->fb.fix.id, var->lower_margin);
#endif
new_regs.lccr0 = fbi->lccr0 |
(LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
LCCR0_QDM | LCCR0_BM | LCCR0_OUM);
new_regs.lccr1 =
LCCR1_DisWdth(var->xres) +
LCCR1_HorSnchWdth(var->hsync_len) +
LCCR1_BegLnDel(var->left_margin) +
LCCR1_EndLnDel(var->right_margin);
/*
* If we have a dual scan LCD, we need to halve
* the YRES parameter.
*/
lines_per_panel = var->yres;
if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
lines_per_panel /= 2;
new_regs.lccr2 =
LCCR2_DisHght(lines_per_panel) +
LCCR2_VrtSnchWdth(var->vsync_len) +
LCCR2_BegFrmDel(var->upper_margin) +
LCCR2_EndFrmDel(var->lower_margin);
new_regs.lccr3 = fbi->lccr3 |
pxafb_bpp_to_lccr3(var) |
(var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
(var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
if (pcd)
new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);
DPRINTK("nlccr0 = 0x%08x\n", new_regs.lccr0);
DPRINTK("nlccr1 = 0x%08x\n", new_regs.lccr1);
DPRINTK("nlccr2 = 0x%08x\n", new_regs.lccr2);
DPRINTK("nlccr3 = 0x%08x\n", new_regs.lccr3);
/* Update shadow copy atomically */
local_irq_save(flags);
/* setup dma descriptors */
fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 3*16);
fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 2*16);
fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 1*16);
fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;
#define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)
/* populate descriptors */
fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
fbi->dmadesc_fblow_cpu->fidr = 0;
fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;
fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */
fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
fbi->dmadesc_fbhigh_cpu->fidr = 0;
fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;
fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
fbi->dmadesc_palette_cpu->fidr = 0;
fbi->dmadesc_palette_cpu->ldcmd = (fbi->palette_size * 2) | LDCMD_PAL;
if (var->bits_per_pixel == 16) {
/* palette shouldn't be loaded in true-color mode */
fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
/* init it to something, even though we won't be using it */
fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
} else {
fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
fbi->fdadr0 = fbi->dmadesc_palette_dma; /* flips back and forth between pal and fbhigh */
}
#if 0
DPRINTK("fbi->dmadesc_fblow_cpu = 0x%p\n", fbi->dmadesc_fblow_cpu);
DPRINTK("fbi->dmadesc_fbhigh_cpu = 0x%p\n", fbi->dmadesc_fbhigh_cpu);
DPRINTK("fbi->dmadesc_palette_cpu = 0x%p\n", fbi->dmadesc_palette_cpu);
DPRINTK("fbi->dmadesc_fblow_dma = 0x%x\n", fbi->dmadesc_fblow_dma);
DPRINTK("fbi->dmadesc_fbhigh_dma = 0x%x\n", fbi->dmadesc_fbhigh_dma);
DPRINTK("fbi->dmadesc_palette_dma = 0x%x\n", fbi->dmadesc_palette_dma);
DPRINTK("fbi->dmadesc_fblow_cpu->fdadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fdadr);
DPRINTK("fbi->dmadesc_fbhigh_cpu->fdadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fdadr);
DPRINTK("fbi->dmadesc_palette_cpu->fdadr = 0x%x\n", fbi->dmadesc_palette_cpu->fdadr);
DPRINTK("fbi->dmadesc_fblow_cpu->fsadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fsadr);
DPRINTK("fbi->dmadesc_fbhigh_cpu->fsadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fsadr);
DPRINTK("fbi->dmadesc_palette_cpu->fsadr = 0x%x\n", fbi->dmadesc_palette_cpu->fsadr);
DPRINTK("fbi->dmadesc_fblow_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fblow_cpu->ldcmd);
DPRINTK("fbi->dmadesc_fbhigh_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fbhigh_cpu->ldcmd);
DPRINTK("fbi->dmadesc_palette_cpu->ldcmd = 0x%x\n", fbi->dmadesc_palette_cpu->ldcmd);
#endif
fbi->reg_lccr0 = new_regs.lccr0;
fbi->reg_lccr1 = new_regs.lccr1;
fbi->reg_lccr2 = new_regs.lccr2;
fbi->reg_lccr3 = new_regs.lccr3;
local_irq_restore(flags);
/*
* Only update the registers if the controller is enabled
* and something has changed.
*/
if ((LCCR0 != fbi->reg_lccr0) || (LCCR1 != fbi->reg_lccr1) ||
(LCCR2 != fbi->reg_lccr2) || (LCCR3 != fbi->reg_lccr3) ||
(FDADR0 != fbi->fdadr0) || (FDADR1 != fbi->fdadr1))
pxafb_schedule_work(fbi, C_REENABLE);
return 0;
}
/*
* NOTE! The following functions are purely helpers for set_ctrlr_state.
* Do not call them directly; set_ctrlr_state does the correct serialisation
* to ensure that things happen in the right way 100% of time time.
* -- rmk
*/
static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on)
{
DPRINTK("backlight o%s\n", on ? "n" : "ff");
if (pxafb_backlight_power)
pxafb_backlight_power(on);
}
static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
{
DPRINTK("LCD power o%s\n", on ? "n" : "ff");
if (pxafb_lcd_power)
pxafb_lcd_power(on);
}
static void pxafb_setup_gpio(struct pxafb_info *fbi)
{
int gpio, ldd_bits;
unsigned int lccr0 = fbi->lccr0;
/*
* setup is based on type of panel supported
*/
/* 4 bit interface */
if ((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
(lccr0 & LCCR0_SDS) == LCCR0_Sngl &&
(lccr0 & LCCR0_DPD) == LCCR0_4PixMono)
ldd_bits = 4;
/* 8 bit interface */
else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) ||
((lccr0 & LCCR0_CMS) == LCCR0_Color &&
(lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl))
ldd_bits = 8;
/* 16 bit interface */
else if ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act))
ldd_bits = 16;
else {
printk(KERN_ERR "pxafb_setup_gpio: unable to determine bits per pixel\n");
return;
}
for (gpio = 58; ldd_bits; gpio++, ldd_bits--)
pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT);
pxa_gpio_mode(GPIO74_LCD_FCLK_MD);
pxa_gpio_mode(GPIO75_LCD_LCLK_MD);
pxa_gpio_mode(GPIO76_LCD_PCLK_MD);
pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD);
}
static void pxafb_enable_controller(struct pxafb_info *fbi)
{
DPRINTK("Enabling LCD controller\n");
DPRINTK("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
DPRINTK("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
DPRINTK("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
DPRINTK("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
DPRINTK("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
DPRINTK("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);
/* Sequence from 11.7.10 */
LCCR3 = fbi->reg_lccr3;
LCCR2 = fbi->reg_lccr2;
LCCR1 = fbi->reg_lccr1;
LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB;
FDADR0 = fbi->fdadr0;
FDADR1 = fbi->fdadr1;
LCCR0 |= LCCR0_ENB;
DPRINTK("FDADR0 0x%08x\n", (unsigned int) FDADR0);
DPRINTK("FDADR1 0x%08x\n", (unsigned int) FDADR1);
DPRINTK("LCCR0 0x%08x\n", (unsigned int) LCCR0);
DPRINTK("LCCR1 0x%08x\n", (unsigned int) LCCR1);
DPRINTK("LCCR2 0x%08x\n", (unsigned int) LCCR2);
DPRINTK("LCCR3 0x%08x\n", (unsigned int) LCCR3);
}
static void pxafb_disable_controller(struct pxafb_info *fbi)
{
DECLARE_WAITQUEUE(wait, current);
DPRINTK("Disabling LCD controller\n");
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&fbi->ctrlr_wait, &wait);
LCSR = 0xffffffff; /* Clear LCD Status Register */
LCCR0 &= ~LCCR0_LDM; /* Enable LCD Disable Done Interrupt */
LCCR0 |= LCCR0_DIS; /* Disable LCD Controller */
schedule_timeout(20 * HZ / 1000);
remove_wait_queue(&fbi->ctrlr_wait, &wait);
}
/*
* pxafb_handle_irq: Handle 'LCD DONE' interrupts.
*/
static irqreturn_t pxafb_handle_irq(int irq, void *dev_id, struct pt_regs *regs)
{
struct pxafb_info *fbi = dev_id;
unsigned int lcsr = LCSR;
if (lcsr & LCSR_LDD) {
LCCR0 |= LCCR0_LDM;
wake_up(&fbi->ctrlr_wait);
}
LCSR = lcsr;
return IRQ_HANDLED;
}
/*
* This function must be called from task context only, since it will
* sleep when disabling the LCD controller, or if we get two contending
* processes trying to alter state.
*/
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
{
u_int old_state;
down(&fbi->ctrlr_sem);
old_state = fbi->state;
/*
* Hack around fbcon initialisation.
*/
if (old_state == C_STARTUP && state == C_REENABLE)
state = C_ENABLE;
switch (state) {
case C_DISABLE_CLKCHANGE:
/*
* Disable controller for clock change. If the
* controller is already disabled, then do nothing.
*/
if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
fbi->state = state;
//TODO __pxafb_lcd_power(fbi, 0);
pxafb_disable_controller(fbi);
}
break;
case C_DISABLE_PM:
case C_DISABLE:
/*
* Disable controller
*/
if (old_state != C_DISABLE) {
fbi->state = state;
__pxafb_backlight_power(fbi, 0);
__pxafb_lcd_power(fbi, 0);
if (old_state != C_DISABLE_CLKCHANGE)
pxafb_disable_controller(fbi);
}
break;
case C_ENABLE_CLKCHANGE:
/*
* Enable the controller after clock change. Only
* do this if we were disabled for the clock change.
*/
if (old_state == C_DISABLE_CLKCHANGE) {
fbi->state = C_ENABLE;
pxafb_enable_controller(fbi);
//TODO __pxafb_lcd_power(fbi, 1);
}
break;
case C_REENABLE:
/*
* Re-enable the controller only if it was already
* enabled. This is so we reprogram the control
* registers.
*/
if (old_state == C_ENABLE) {
pxafb_disable_controller(fbi);
pxafb_setup_gpio(fbi);
pxafb_enable_controller(fbi);
}
break;
case C_ENABLE_PM:
/*
* Re-enable the controller after PM. This is not
* perfect - think about the case where we were doing
* a clock change, and we suspended half-way through.
*/
if (old_state != C_DISABLE_PM)
break;
/* fall through */
case C_ENABLE:
/*
* Power up the LCD screen, enable controller, and
* turn on the backlight.
*/
if (old_state != C_ENABLE) {
fbi->state = C_ENABLE;
pxafb_setup_gpio(fbi);
pxafb_enable_controller(fbi);
__pxafb_lcd_power(fbi, 1);
__pxafb_backlight_power(fbi, 1);
}
break;
}
up(&fbi->ctrlr_sem);
}
/*
* Our LCD controller task (which is called when we blank or unblank)
* via keventd.
*/
static void pxafb_task(void *dummy)
{
struct pxafb_info *fbi = dummy;
u_int state = xchg(&fbi->task_state, -1);
set_ctrlr_state(fbi, state);
}
#ifdef CONFIG_CPU_FREQ
/*
* CPU clock speed change handler. We need to adjust the LCD timing
* parameters when the CPU clock is adjusted by the power management
* subsystem.
*
* TODO: Determine why f->new != 10*get_lclk_frequency_10khz()
*/
static int
pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
{
struct pxafb_info *fbi = TO_INF(nb, freq_transition);
//TODO struct cpufreq_freqs *f = data;
u_int pcd;
switch (val) {
case CPUFREQ_PRECHANGE:
set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
break;
case CPUFREQ_POSTCHANGE:
pcd = get_pcd(fbi->fb.var.pixclock);
fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
break;
}
return 0;
}
static int
pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
{
struct pxafb_info *fbi = TO_INF(nb, freq_policy);
struct fb_var_screeninfo *var = &fbi->fb.var;
struct cpufreq_policy *policy = data;
switch (val) {
case CPUFREQ_ADJUST:
case CPUFREQ_INCOMPATIBLE:
printk(KERN_DEBUG "min dma period: %d ps, "
"new clock %d kHz\n", pxafb_display_dma_period(var),
policy->max);
// TODO: fill in min/max values
break;
#if 0
case CPUFREQ_NOTIFY:
printk(KERN_ERR "%s: got CPUFREQ_NOTIFY\n", __FUNCTION__);
do {} while(0);
/* todo: panic if min/max values aren't fulfilled
* [can't really happen unless there's a bug in the
* CPU policy verification process *
*/
break;
#endif
}
return 0;
}
#endif
#ifdef CONFIG_PM
/*
* Power management hooks. Note that we won't be called from IRQ context,
* unlike the blank functions above, so we may sleep.
*/
static int pxafb_suspend(struct device *dev, pm_message_t state, u32 level)
{
struct pxafb_info *fbi = dev_get_drvdata(dev);
if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN)
set_ctrlr_state(fbi, C_DISABLE_PM);
return 0;
}
static int pxafb_resume(struct device *dev, u32 level)
{
struct pxafb_info *fbi = dev_get_drvdata(dev);
if (level == RESUME_ENABLE)
set_ctrlr_state(fbi, C_ENABLE_PM);
return 0;
}
#else
#define pxafb_suspend NULL
#define pxafb_resume NULL
#endif
/*
* pxafb_map_video_memory():
* Allocates the DRAM memory for the frame buffer. This buffer is
* remapped into a non-cached, non-buffered, memory region to
* allow palette and pixel writes to occur without flushing the
* cache. Once this area is remapped, all virtual memory
* access to the video memory should occur at the new region.
*/
static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
{
u_long palette_mem_size;
/*
* We reserve one page for the palette, plus the size
* of the framebuffer.
*/
fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
&fbi->map_dma, GFP_KERNEL);
if (fbi->map_cpu) {
/* prevent initial garbage on screen */
memset(fbi->map_cpu, 0, fbi->map_size);
fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
/*
* FIXME: this is actually the wrong thing to place in
* smem_start. But fbdev suffers from the problem that
* it needs an API which doesn't exist (in this case,
* dma_writecombine_mmap)
*/
fbi->fb.fix.smem_start = fbi->screen_dma;
fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
palette_mem_size = fbi->palette_size * sizeof(u16);
DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);
fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
}
return fbi->map_cpu ? 0 : -ENOMEM;
}
static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
{
struct pxafb_info *fbi;
void *addr;
struct pxafb_mach_info *inf = dev->platform_data;
/* Alloc the pxafb_info and pseudo_palette in one step */
fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
if (!fbi)
return NULL;
memset(fbi, 0, sizeof(struct pxafb_info));
fbi->dev = dev;
strcpy(fbi->fb.fix.id, PXA_NAME);
fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fbi->fb.fix.type_aux = 0;
fbi->fb.fix.xpanstep = 0;
fbi->fb.fix.ypanstep = 0;
fbi->fb.fix.ywrapstep = 0;
fbi->fb.fix.accel = FB_ACCEL_NONE;
fbi->fb.var.nonstd = 0;
fbi->fb.var.activate = FB_ACTIVATE_NOW;
fbi->fb.var.height = -1;
fbi->fb.var.width = -1;
fbi->fb.var.accel_flags = 0;
fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
fbi->fb.fbops = &pxafb_ops;
fbi->fb.flags = FBINFO_DEFAULT;
fbi->fb.node = -1;
addr = fbi;
addr = addr + sizeof(struct pxafb_info);
fbi->fb.pseudo_palette = addr;
fbi->max_xres = inf->xres;
fbi->fb.var.xres = inf->xres;
fbi->fb.var.xres_virtual = inf->xres;
fbi->max_yres = inf->yres;
fbi->fb.var.yres = inf->yres;
fbi->fb.var.yres_virtual = inf->yres;
fbi->max_bpp = inf->bpp;
fbi->fb.var.bits_per_pixel = inf->bpp;
fbi->fb.var.pixclock = inf->pixclock;
fbi->fb.var.hsync_len = inf->hsync_len;
fbi->fb.var.left_margin = inf->left_margin;
fbi->fb.var.right_margin = inf->right_margin;
fbi->fb.var.vsync_len = inf->vsync_len;
fbi->fb.var.upper_margin = inf->upper_margin;
fbi->fb.var.lower_margin = inf->lower_margin;
fbi->fb.var.sync = inf->sync;
fbi->fb.var.grayscale = inf->cmap_greyscale;
fbi->cmap_inverse = inf->cmap_inverse;
fbi->cmap_static = inf->cmap_static;
fbi->lccr0 = inf->lccr0;
fbi->lccr3 = inf->lccr3;
fbi->state = C_STARTUP;
fbi->task_state = (u_char)-1;
fbi->fb.fix.smem_len = fbi->max_xres * fbi->max_yres *
fbi->max_bpp / 8;
init_waitqueue_head(&fbi->ctrlr_wait);
INIT_WORK(&fbi->task, pxafb_task, fbi);
init_MUTEX(&fbi->ctrlr_sem);
return fbi;
}
#ifdef CONFIG_FB_PXA_PARAMETERS
static int __init pxafb_parse_options(struct device *dev, char *options)
{
struct pxafb_mach_info *inf = dev->platform_data;
char *this_opt;
if (!options || !*options)
return 0;
dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");
/* could be made table driven or similar?... */
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!strncmp(this_opt, "mode:", 5)) {
const char *name = this_opt+5;
unsigned int namelen = strlen(name);
int res_specified = 0, bpp_specified = 0;
unsigned int xres = 0, yres = 0, bpp = 0;
int yres_specified = 0;
int i;
for (i = namelen-1; i >= 0; i--) {
switch (name[i]) {
case '-':
namelen = i;
if (!bpp_specified && !yres_specified) {
bpp = simple_strtoul(&name[i+1], NULL, 0);
bpp_specified = 1;
} else
goto done;
break;
case 'x':
if (!yres_specified) {
yres = simple_strtoul(&name[i+1], NULL, 0);
yres_specified = 1;
} else
goto done;
break;
case '0'...'9':
break;
default:
goto done;
}
}
if (i < 0 && yres_specified) {
xres = simple_strtoul(name, NULL, 0);
res_specified = 1;
}
done:
if (res_specified) {
dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
inf->xres = xres; inf->yres = yres;
}
if (bpp_specified)
switch (bpp) {
case 1:
case 2:
case 4:
case 8:
case 16:
inf->bpp = bpp;
dev_info(dev, "overriding bit depth: %d\n", bpp);
break;
default:
dev_err(dev, "Depth %d is not valid\n", bpp);
}
} else if (!strncmp(this_opt, "pixclock:", 9)) {
inf->pixclock = simple_strtoul(this_opt+9, NULL, 0);
dev_info(dev, "override pixclock: %ld\n", inf->pixclock);
} else if (!strncmp(this_opt, "left:", 5)) {
inf->left_margin = simple_strtoul(this_opt+5, NULL, 0);
dev_info(dev, "override left: %u\n", inf->left_margin);
} else if (!strncmp(this_opt, "right:", 6)) {
inf->right_margin = simple_strtoul(this_opt+6, NULL, 0);
dev_info(dev, "override right: %u\n", inf->right_margin);
} else if (!strncmp(this_opt, "upper:", 6)) {
inf->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
dev_info(dev, "override upper: %u\n", inf->upper_margin);
} else if (!strncmp(this_opt, "lower:", 6)) {
inf->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
dev_info(dev, "override lower: %u\n", inf->lower_margin);
} else if (!strncmp(this_opt, "hsynclen:", 9)) {
inf->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
dev_info(dev, "override hsynclen: %u\n", inf->hsync_len);
} else if (!strncmp(this_opt, "vsynclen:", 9)) {
inf->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
dev_info(dev, "override vsynclen: %u\n", inf->vsync_len);
} else if (!strncmp(this_opt, "hsync:", 6)) {
if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
dev_info(dev, "override hsync: Active Low\n");
inf->sync &= ~FB_SYNC_HOR_HIGH_ACT;
} else {
dev_info(dev, "override hsync: Active High\n");
inf->sync |= FB_SYNC_HOR_HIGH_ACT;
}
} else if (!strncmp(this_opt, "vsync:", 6)) {
if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
dev_info(dev, "override vsync: Active Low\n");
inf->sync &= ~FB_SYNC_VERT_HIGH_ACT;
} else {
dev_info(dev, "override vsync: Active High\n");
inf->sync |= FB_SYNC_VERT_HIGH_ACT;
}
} else if (!strncmp(this_opt, "dpc:", 4)) {
if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
dev_info(dev, "override double pixel clock: false\n");
inf->lccr3 &= ~LCCR3_DPC;
} else {
dev_info(dev, "override double pixel clock: true\n");
inf->lccr3 |= LCCR3_DPC;
}
} else if (!strncmp(this_opt, "outputen:", 9)) {
if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
dev_info(dev, "override output enable: active low\n");
inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
} else {
dev_info(dev, "override output enable: active high\n");
inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
}
} else if (!strncmp(this_opt, "pixclockpol:", 12)) {
if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
dev_info(dev, "override pixel clock polarity: falling edge\n");
inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
} else {
dev_info(dev, "override pixel clock polarity: rising edge\n");
inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
}
} else if (!strncmp(this_opt, "color", 5)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
} else if (!strncmp(this_opt, "mono", 4)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
} else if (!strncmp(this_opt, "active", 6)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
} else if (!strncmp(this_opt, "passive", 7)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
} else if (!strncmp(this_opt, "single", 6)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
} else if (!strncmp(this_opt, "dual", 4)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
} else if (!strncmp(this_opt, "4pix", 4)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
} else if (!strncmp(this_opt, "8pix", 4)) {
inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
} else {
dev_err(dev, "unknown option: %s\n", this_opt);
return -EINVAL;
}
}
return 0;
}
#endif
int __init pxafb_probe(struct device *dev)
{
struct pxafb_info *fbi;
struct pxafb_mach_info *inf;
int ret;
dev_dbg(dev, "pxafb_probe\n");
inf = dev->platform_data;
ret = -ENOMEM;
fbi = NULL;
if (!inf)
goto failed;
#ifdef CONFIG_FB_PXA_PARAMETERS
ret = pxafb_parse_options(dev, g_options);
if (ret < 0)
goto failed;
#endif
#ifdef DEBUG_VAR
/* Check for various illegal bit-combinations. Currently only
* a warning is given. */
if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
dev_warn(dev, "machine LCCR0 setting contains illegal bits: %08x\n",
inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
dev_warn(dev, "machine LCCR3 setting contains illegal bits: %08x\n",
inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
if (inf->lccr0 & LCCR0_DPD &&
((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
(inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
(inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
dev_warn(dev, "Double Pixel Data (DPD) mode is only valid in passive mono"
" single panel mode\n");
if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
(inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
dev_warn(dev, "Dual panel only valid in passive mode\n");
if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
(inf->upper_margin || inf->lower_margin))
dev_warn(dev, "Upper and lower margins must be 0 in passive mode\n");
#endif
dev_dbg(dev, "got a %dx%dx%d LCD\n",inf->xres, inf->yres, inf->bpp);
if (inf->xres == 0 || inf->yres == 0 || inf->bpp == 0) {
dev_err(dev, "Invalid resolution or bit depth\n");
ret = -EINVAL;
goto failed;
}
pxafb_backlight_power = inf->pxafb_backlight_power;
pxafb_lcd_power = inf->pxafb_lcd_power;
fbi = pxafb_init_fbinfo(dev);
if (!fbi) {
dev_err(dev, "Failed to initialize framebuffer device\n");
ret = -ENOMEM; // only reason for pxafb_init_fbinfo to fail is kmalloc
goto failed;
}
/* Initialize video memory */
ret = pxafb_map_video_memory(fbi);
if (ret) {
dev_err(dev, "Failed to allocate video RAM: %d\n", ret);
ret = -ENOMEM;
goto failed;
}
/* enable LCD controller clock */
pxa_set_cken(CKEN16_LCD, 1);
ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, "LCD", fbi);
if (ret) {
dev_err(dev, "request_irq failed: %d\n", ret);
ret = -EBUSY;
goto failed;
}
/*
* This makes sure that our colour bitfield
* descriptors are correctly initialised.
*/
pxafb_check_var(&fbi->fb.var, &fbi->fb);
pxafb_set_par(&fbi->fb);
dev_set_drvdata(dev, fbi);
ret = register_framebuffer(&fbi->fb);
if (ret < 0) {
dev_err(dev, "Failed to register framebuffer device: %d\n", ret);
goto failed;
}
#ifdef CONFIG_PM
// TODO
#endif
#ifdef CONFIG_CPU_FREQ
fbi->freq_transition.notifier_call = pxafb_freq_transition;
fbi->freq_policy.notifier_call = pxafb_freq_policy;
cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
#endif
/*
* Ok, now enable the LCD controller
*/
set_ctrlr_state(fbi, C_ENABLE);
return 0;
failed:
dev_set_drvdata(dev, NULL);
kfree(fbi);
return ret;
}
static struct device_driver pxafb_driver = {
.name = "pxa2xx-fb",
.bus = &platform_bus_type,
.probe = pxafb_probe,
#ifdef CONFIG_PM
.suspend = pxafb_suspend,
.resume = pxafb_resume,
#endif
};
#ifndef MODULE
int __devinit pxafb_setup(char *options)
{
# ifdef CONFIG_FB_PXA_PARAMETERS
strlcpy(g_options, options, sizeof(g_options));
# endif
return 0;
}
#else
# ifdef CONFIG_FB_PXA_PARAMETERS
module_param_string(options, g_options, sizeof(g_options), 0);
MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
# endif
#endif
int __devinit pxafb_init(void)
{
#ifndef MODULE
char *option = NULL;
if (fb_get_options("pxafb", &option))
return -ENODEV;
pxafb_setup(option);
#endif
return driver_register(&pxafb_driver);
}
module_init(pxafb_init);
MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
MODULE_LICENSE("GPL");
