/* linux/drivers/video/s3c-fb.c
*
* Copyright 2008 Openmoko Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* Samsung SoC Framebuffer driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <mach/map.h>
#include <mach/regs-fb.h>
#include <plat/fb.h>
/* This driver will export a number of framebuffer interfaces depending
* on the configuration passed in via the platform data. Each fb instance
* maps to a hardware window. Currently there is no support for runtime
* setting of the alpha-blending functions that each window has, so only
* window 0 is actually useful.
*
* Window 0 is treated specially, it is used for the basis of the LCD
* output timings and as the control for the output power-down state.
*/
/* note, some of the functions that get called are derived from including
* <mach/regs-fb.h> as they are specific to the architecture that the code
* is being built for.
*/
#ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
#undef writel
#define writel(v, r) do { \
printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \
__raw_writel(v, r); } while(0)
#endif /* FB_S3C_DEBUG_REGWRITE */
struct s3c_fb;
/**
* struct s3c_fb_win - per window private data for each framebuffer.
* @windata: The platform data supplied for the window configuration.
* @parent: The hardware that this window is part of.
* @fbinfo: Pointer pack to the framebuffer info for this window.
* @palette_buffer: Buffer/cache to hold palette entries.
* @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/
* @index: The window number of this window.
* @palette: The bitfields for changing r/g/b into a hardware palette entry.
*/
struct s3c_fb_win {
struct s3c_fb_pd_win *windata;
struct s3c_fb *parent;
struct fb_info *fbinfo;
struct s3c_fb_palette palette;
u32 *palette_buffer;
u32 pseudo_palette[16];
unsigned int index;
};
/**
* struct s3c_fb - overall hardware state of the hardware
* @dev: The device that we bound to, for printing, etc.
* @regs_res: The resource we claimed for the IO registers.
* @bus_clk: The clk (hclk) feeding our interface and possibly pixclk.
* @regs: The mapped hardware registers.
* @enabled: A bitmask of enabled hardware windows.
* @pdata: The platform configuration data passed with the device.
* @windows: The hardware windows that have been claimed.
*/
struct s3c_fb {
struct device *dev;
struct resource *regs_res;
struct clk *bus_clk;
void __iomem *regs;
unsigned char enabled;
struct s3c_fb_platdata *pdata;
struct s3c_fb_win *windows[S3C_FB_MAX_WIN];
};
/**
* s3c_fb_win_has_palette() - determine if a mode has a palette
* @win: The window number being queried.
* @bpp: The number of bits per pixel to test.
*
* Work out if the given window supports palletised data at the specified bpp.
*/
static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp)
{
return s3c_fb_win_pal_size(win) <= (1 << bpp);
}
/**
* s3c_fb_check_var() - framebuffer layer request to verify a given mode.
* @var: The screen information to verify.
* @info: The framebuffer device.
*
* Framebuffer layer call to verify the given information and allow us to
* update various information depending on the hardware capabilities.
*/
static int s3c_fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct s3c_fb_win *win = info->par;
struct s3c_fb_pd_win *windata = win->windata;
struct s3c_fb *sfb = win->parent;
dev_dbg(sfb->dev, "checking parameters\n");
var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres);
var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres);
if (!s3c_fb_validate_win_bpp(win->index, var->bits_per_pixel)) {
dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n",
win->index, var->bits_per_pixel);
return -EINVAL;
}
/* always ensure these are zero, for drop through cases below */
var->transp.offset = 0;
var->transp.length = 0;
switch (var->bits_per_pixel) {
case 1:
case 2:
case 4:
case 8:
if (!s3c_fb_win_has_palette(win->index, var->bits_per_pixel)) {
/* non palletised, A:1,R:2,G:3,B:2 mode */
var->red.offset = 4;
var->green.offset = 2;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 3;
var->blue.length = 2;
var->transp.offset = 7;
var->transp.length = 1;
} else {
var->red.offset = 0;
var->red.length = var->bits_per_pixel;
var->green = var->red;
var->blue = var->red;
}
break;
case 19:
/* 666 with one bit alpha/transparency */
var->transp.offset = 18;
var->transp.length = 1;
case 18:
var->bits_per_pixel = 32;
/* 666 format */
var->red.offset = 12;
var->green.offset = 6;
var->blue.offset = 0;
var->red.length = 6;
var->green.length = 6;
var->blue.length = 6;
break;
case 16:
/* 16 bpp, 565 format */
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
break;
case 28:
case 25:
var->transp.length = var->bits_per_pixel - 24;
var->transp.offset = 24;
/* drop through */
case 24:
/* our 24bpp is unpacked, so 32bpp */
var->bits_per_pixel = 32;
case 32:
var->red.offset = 16;
var->red.length = 8;
var->green.offset = 8;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
break;
default:
dev_err(sfb->dev, "invalid bpp\n");
}
dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
return 0;
}
/**
* s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
* @sfb: The hardware state.
* @pixclock: The pixel clock wanted, in picoseconds.
*
* Given the specified pixel clock, work out the necessary divider to get
* close to the output frequency.
*/
static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
{
unsigned long clk = clk_get_rate(sfb->bus_clk);
unsigned long long tmp;
unsigned int result;
tmp = (unsigned long long)clk;
tmp *= pixclk;
do_div(tmp, 1000000000UL);
result = (unsigned int)tmp / 1000;
dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
pixclk, clk, result, clk / result);
return result;
}
/**
* s3c_fb_align_word() - align pixel count to word boundary
* @bpp: The number of bits per pixel
* @pix: The value to be aligned.
*
* Align the given pixel count so that it will start on an 32bit word
* boundary.
*/
static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
{
int pix_per_word;
if (bpp > 16)
return pix;
pix_per_word = (8 * 32) / bpp;
return ALIGN(pix, pix_per_word);
}
/**
* s3c_fb_set_par() - framebuffer request to set new framebuffer state.
* @info: The framebuffer to change.
*
* Framebuffer layer request to set a new mode for the specified framebuffer
*/
static int s3c_fb_set_par(struct fb_info *info)
{
struct fb_var_screeninfo *var = &info->var;
struct s3c_fb_win *win = info->par;
struct s3c_fb *sfb = win->parent;
void __iomem *regs = sfb->regs;
int win_no = win->index;
u32 data;
u32 pagewidth;
int clkdiv;
dev_dbg(sfb->dev, "setting framebuffer parameters\n");
switch (var->bits_per_pixel) {
case 32:
case 24:
case 16:
case 12:
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 8:
if (s3c_fb_win_has_palette(win_no, 8))
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 1:
info->fix.visual = FB_VISUAL_MONO01;
break;
default:
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
}
info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
/* disable the window whilst we update it */
writel(0, regs + WINCON(win_no));
/* use window 0 as the basis for the lcd output timings */
if (win_no == 0) {
clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);
data = sfb->pdata->vidcon0;
data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
if (clkdiv > 1)
data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
else
data &= ~VIDCON0_CLKDIR; /* 1:1 clock */
/* write the timing data to the panel */
data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
writel(data, regs + VIDCON0);
data = VIDTCON0_VBPD(var->upper_margin - 1) |
VIDTCON0_VFPD(var->lower_margin - 1) |
VIDTCON0_VSPW(var->vsync_len - 1);
writel(data, regs + VIDTCON0);
data = VIDTCON1_HBPD(var->left_margin - 1) |
VIDTCON1_HFPD(var->right_margin - 1) |
VIDTCON1_HSPW(var->hsync_len - 1);
writel(data, regs + VIDTCON1);
data = VIDTCON2_LINEVAL(var->yres - 1) |
VIDTCON2_HOZVAL(var->xres - 1);
writel(data, regs + VIDTCON2);
}
/* write the buffer address */
writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
data = info->fix.smem_start + info->fix.line_length * var->yres;
writel(data, regs + VIDW_BUF_END(win_no));
pagewidth = (var->xres * var->bits_per_pixel) >> 3;
data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
VIDW_BUF_SIZE_PAGEWIDTH(pagewidth);
writel(data, regs + VIDW_BUF_SIZE(win_no));
/* write 'OSD' registers to control position of framebuffer */
data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
writel(data, regs + VIDOSD_A(win_no));
data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
var->xres - 1)) |
VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
writel(data, regs + VIDOSD_B(win_no));
data = var->xres * var->yres;
if (s3c_fb_has_osd_d(win_no)) {
writel(data, regs + VIDOSD_D(win_no));
writel(0, regs + VIDOSD_C(win_no));
} else
writel(data, regs + VIDOSD_C(win_no));
data = WINCONx_ENWIN;
/* note, since we have to round up the bits-per-pixel, we end up
* relying on the bitfield information for r/g/b/a to work out
* exactly which mode of operation is intended. */
switch (var->bits_per_pixel) {
case 1:
data |= WINCON0_BPPMODE_1BPP;
data |= WINCONx_BITSWP;
data |= WINCONx_BURSTLEN_4WORD;
break;
case 2:
data |= WINCON0_BPPMODE_2BPP;
data |= WINCONx_BITSWP;
data |= WINCONx_BURSTLEN_8WORD;
break;
case 4:
data |= WINCON0_BPPMODE_4BPP;
data |= WINCONx_BITSWP;
data |= WINCONx_BURSTLEN_8WORD;
break;
case 8:
if (var->transp.length != 0)
data |= WINCON1_BPPMODE_8BPP_1232;
else
data |= WINCON0_BPPMODE_8BPP_PALETTE;
data |= WINCONx_BURSTLEN_8WORD;
data |= WINCONx_BYTSWP;
break;
case 16:
if (var->transp.length != 0)
data |= WINCON1_BPPMODE_16BPP_A1555;
else
data |= WINCON0_BPPMODE_16BPP_565;
data |= WINCONx_HAWSWP;
data |= WINCONx_BURSTLEN_16WORD;
break;
case 24:
case 32:
if (var->red.length == 6) {
if (var->transp.length != 0)
data |= WINCON1_BPPMODE_19BPP_A1666;
else
data |= WINCON1_BPPMODE_18BPP_666;
} else if (var->transp.length != 0)
data |= WINCON1_BPPMODE_25BPP_A1888;
else
data |= WINCON0_BPPMODE_24BPP_888;
data |= WINCONx_BURSTLEN_16WORD;
break;
}
writel(data, regs + WINCON(win_no));
writel(0x0, regs + WINxMAP(win_no));
return 0;
}
/**
* s3c_fb_update_palette() - set or schedule a palette update.
* @sfb: The hardware information.
* @win: The window being updated.
* @reg: The palette index being changed.
* @value: The computed palette value.
*
* Change the value of a palette register, either by directly writing to
* the palette (this requires the palette RAM to be disconnected from the
* hardware whilst this is in progress) or schedule the update for later.
*
* At the moment, since we have no VSYNC interrupt support, we simply set
* the palette entry directly.
*/
static void s3c_fb_update_palette(struct s3c_fb *sfb,
struct s3c_fb_win *win,
unsigned int reg,
u32 value)
{
void __iomem *palreg;
u32 palcon;
palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
__func__, win->index, reg, palreg, value);
win->palette_buffer[reg] = value;
palcon = readl(sfb->regs + WPALCON);
writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
if (s3c_fb_pal_is16(win->index))
writew(value, palreg);
else
writel(value, palreg);
writel(palcon, sfb->regs + WPALCON);
}
static inline unsigned int chan_to_field(unsigned int chan,
struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
/**
* s3c_fb_setcolreg() - framebuffer layer request to change palette.
* @regno: The palette index to change.
* @red: The red field for the palette data.
* @green: The green field for the palette data.
* @blue: The blue field for the palette data.
* @trans: The transparency (alpha) field for the palette data.
* @info: The framebuffer being changed.
*/
static int s3c_fb_setcolreg(unsigned regno,
unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *info)
{
struct s3c_fb_win *win = info->par;
struct s3c_fb *sfb = win->parent;
unsigned int val;
dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
__func__, win->index, regno, red, green, blue);
switch (info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
/* true-colour, use pseudo-palette */
if (regno < 16) {
u32 *pal = info->pseudo_palette;
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue, &info->var.blue);
pal[regno] = val;
}
break;
case FB_VISUAL_PSEUDOCOLOR:
if (regno < s3c_fb_win_pal_size(win->index)) {
val = chan_to_field(red, &win->palette.r);
val |= chan_to_field(green, &win->palette.g);
val |= chan_to_field(blue, &win->palette.b);
s3c_fb_update_palette(sfb, win, regno, val);
}
break;
default:
return 1; /* unknown type */
}
return 0;
}
/**
* s3c_fb_enable() - Set the state of the main LCD output
* @sfb: The main framebuffer state.
* @enable: The state to set.
*/
static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
{
u32 vidcon0 = readl(sfb->regs + VIDCON0);
if (enable)
vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
else {
/* see the note in the framebuffer datasheet about
* why you cannot take both of these bits down at the
* same time. */
if (!(vidcon0 & VIDCON0_ENVID))
return;
vidcon0 |= VIDCON0_ENVID;
vidcon0 &= ~VIDCON0_ENVID_F;
}
writel(vidcon0, sfb->regs + VIDCON0);
}
/**
* s3c_fb_blank() - blank or unblank the given window
* @blank_mode: The blank state from FB_BLANK_*
* @info: The framebuffer to blank.
*
* Framebuffer layer request to change the power state.
*/
static int s3c_fb_blank(int blank_mode, struct fb_info *info)
{
struct s3c_fb_win *win = info->par;
struct s3c_fb *sfb = win->parent;
unsigned int index = win->index;
u32 wincon;
dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
wincon = readl(sfb->regs + WINCON(index));
switch (blank_mode) {
case FB_BLANK_POWERDOWN:
wincon &= ~WINCONx_ENWIN;
sfb->enabled &= ~(1 << index);
/* fall through to FB_BLANK_NORMAL */
case FB_BLANK_NORMAL:
/* disable the DMA and display 0x0 (black) */
writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
sfb->regs + WINxMAP(index));
break;
case FB_BLANK_UNBLANK:
writel(0x0, sfb->regs + WINxMAP(index));
wincon |= WINCONx_ENWIN;
sfb->enabled |= (1 << index);
break;
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
default:
return 1;
}
writel(wincon, sfb->regs + WINCON(index));
/* Check the enabled state to see if we need to be running the
* main LCD interface, as if there are no active windows then
* it is highly likely that we also do not need to output
* anything.
*/
/* We could do something like the following code, but the current
* system of using framebuffer events means that we cannot make
* the distinction between just window 0 being inactive and all
* the windows being down.
*
* s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
*/
/* we're stuck with this until we can do something about overriding
* the power control using the blanking event for a single fb.
*/
if (index == 0)
s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
return 0;
}
static struct fb_ops s3c_fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = s3c_fb_check_var,
.fb_set_par = s3c_fb_set_par,
.fb_blank = s3c_fb_blank,
.fb_setcolreg = s3c_fb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/**
* s3c_fb_alloc_memory() - allocate display memory for framebuffer window
* @sfb: The base resources for the hardware.
* @win: The window to initialise memory for.
*
* Allocate memory for the given framebuffer.
*/
static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
struct s3c_fb_win *win)
{
struct s3c_fb_pd_win *windata = win->windata;
unsigned int real_size, virt_size, size;
struct fb_info *fbi = win->fbinfo;
dma_addr_t map_dma;
dev_dbg(sfb->dev, "allocating memory for display\n");
real_size = windata->win_mode.xres * windata->win_mode.yres;
virt_size = windata->virtual_x * windata->virtual_y;
dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
real_size, windata->win_mode.xres, windata->win_mode.yres,
virt_size, windata->virtual_x, windata->virtual_y);
size = (real_size > virt_size) ? real_size : virt_size;
size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
size /= 8;
fbi->fix.smem_len = size;
size = PAGE_ALIGN(size);
dev_dbg(sfb->dev, "want %u bytes for window\n", size);
fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
&map_dma, GFP_KERNEL);
if (!fbi->screen_base)
return -ENOMEM;
dev_dbg(sfb->dev, "mapped %x to %p\n",
(unsigned int)map_dma, fbi->screen_base);
memset(fbi->screen_base, 0x0, size);
fbi->fix.smem_start = map_dma;
return 0;
}
/**
* s3c_fb_free_memory() - free the display memory for the given window
* @sfb: The base resources for the hardware.
* @win: The window to free the display memory for.
*
* Free the display memory allocated by s3c_fb_alloc_memory().
*/
static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
struct fb_info *fbi = win->fbinfo;
dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
fbi->screen_base, fbi->fix.smem_start);
}
/**
* s3c_fb_release_win() - release resources for a framebuffer window.
* @win: The window to cleanup the resources for.
*
* Release the resources that where claimed for the hardware window,
* such as the framebuffer instance and any memory claimed for it.
*/
static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
fb_dealloc_cmap(&win->fbinfo->cmap);
unregister_framebuffer(win->fbinfo);
s3c_fb_free_memory(sfb, win);
}
/**
* s3c_fb_probe_win() - register an hardware window
* @sfb: The base resources for the hardware
* @res: Pointer to where to place the resultant window.
*
* Allocate and do the basic initialisation for one of the hardware's graphics
* windows.
*/
static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
struct s3c_fb_win **res)
{
struct fb_var_screeninfo *var;
struct fb_videomode *initmode;
struct s3c_fb_pd_win *windata;
struct s3c_fb_win *win;
struct fb_info *fbinfo;
int palette_size;
int ret;
dev_dbg(sfb->dev, "probing window %d\n", win_no);
palette_size = s3c_fb_win_pal_size(win_no);
fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
palette_size * sizeof(u32), sfb->dev);
if (!fbinfo) {
dev_err(sfb->dev, "failed to allocate framebuffer\n");
return -ENOENT;
}
windata = sfb->pdata->win[win_no];
initmode = &windata->win_mode;
WARN_ON(windata->max_bpp == 0);
WARN_ON(windata->win_mode.xres == 0);
WARN_ON(windata->win_mode.yres == 0);
win = fbinfo->par;
var = &fbinfo->var;
win->fbinfo = fbinfo;
win->parent = sfb;
win->windata = windata;
win->index = win_no;
win->palette_buffer = (u32 *)(win + 1);
ret = s3c_fb_alloc_memory(sfb, win);
if (ret) {
dev_err(sfb->dev, "failed to allocate display memory\n");
goto err_framebuffer;
}
/* setup the r/b/g positions for the window's palette */
s3c_fb_init_palette(win_no, &win->palette);
/* setup the initial video mode from the window */
fb_videomode_to_var(&fbinfo->var, initmode);
fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
fbinfo->fix.accel = FB_ACCEL_NONE;
fbinfo->var.activate = FB_ACTIVATE_NOW;
fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
fbinfo->var.bits_per_pixel = windata->default_bpp;
fbinfo->fbops = &s3c_fb_ops;
fbinfo->flags = FBINFO_FLAG_DEFAULT;
fbinfo->pseudo_palette = &win->pseudo_palette;
/* prepare to actually start the framebuffer */
ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
if (ret < 0) {
dev_err(sfb->dev, "check_var failed on initial video params\n");
goto err_alloc_mem;
}
/* create initial colour map */
ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
if (ret == 0)
fb_set_cmap(&fbinfo->cmap, fbinfo);
else
dev_err(sfb->dev, "failed to allocate fb cmap\n");
s3c_fb_set_par(fbinfo);
dev_dbg(sfb->dev, "about to register framebuffer\n");
/* run the check_var and set_par on our configuration. */
ret = register_framebuffer(fbinfo);
if (ret < 0) {
dev_err(sfb->dev, "failed to register framebuffer\n");
goto err_alloc_mem;
}
*res = win;
dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
return 0;
err_alloc_mem:
s3c_fb_free_memory(sfb, win);
err_framebuffer:
unregister_framebuffer(fbinfo);
return ret;
}
/**
* s3c_fb_clear_win() - clear hardware window registers.
* @sfb: The base resources for the hardware.
* @win: The window to process.
*
* Reset the specific window registers to a known state.
*/
static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
{
void __iomem *regs = sfb->regs;
writel(0, regs + WINCON(win));
writel(0xffffff, regs + WxKEYCONy(win, 0));
writel(0xffffff, regs + WxKEYCONy(win, 1));
writel(0, regs + VIDOSD_A(win));
writel(0, regs + VIDOSD_B(win));
writel(0, regs + VIDOSD_C(win));
}
static int __devinit s3c_fb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct s3c_fb_platdata *pd;
struct s3c_fb *sfb;
struct resource *res;
int win;
int ret = 0;
pd = pdev->dev.platform_data;
if (!pd) {
dev_err(dev, "no platform data specified\n");
return -EINVAL;
}
sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
if (!sfb) {
dev_err(dev, "no memory for framebuffers\n");
return -ENOMEM;
}
sfb->dev = dev;
sfb->pdata = pd;
sfb->bus_clk = clk_get(dev, "lcd");
if (IS_ERR(sfb->bus_clk)) {
dev_err(dev, "failed to get bus clock\n");
goto err_sfb;
}
clk_enable(sfb->bus_clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "failed to find registers\n");
ret = -ENOENT;
goto err_clk;
}
sfb->regs_res = request_mem_region(res->start, resource_size(res),
dev_name(dev));
if (!sfb->regs_res) {
dev_err(dev, "failed to claim register region\n");
ret = -ENOENT;
goto err_clk;
}
sfb->regs = ioremap(res->start, resource_size(res));
if (!sfb->regs) {
dev_err(dev, "failed to map registers\n");
ret = -ENXIO;
goto err_req_region;
}
dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
/* setup gpio and output polarity controls */
pd->setup_gpio();
writel(pd->vidcon1, sfb->regs + VIDCON1);
/* zero all windows before we do anything */
for (win = 0; win < S3C_FB_MAX_WIN; win++)
s3c_fb_clear_win(sfb, win);
/* we have the register setup, start allocating framebuffers */
for (win = 0; win < S3C_FB_MAX_WIN; win++) {
if (!pd->win[win])
continue;
ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
if (ret < 0) {
dev_err(dev, "failed to create window %d\n", win);
for (; win >= 0; win--)
s3c_fb_release_win(sfb, sfb->windows[win]);
goto err_ioremap;
}
}
platform_set_drvdata(pdev, sfb);
return 0;
err_ioremap:
iounmap(sfb->regs);
err_req_region:
release_resource(sfb->regs_res);
kfree(sfb->regs_res);
err_clk:
clk_disable(sfb->bus_clk);
clk_put(sfb->bus_clk);
err_sfb:
kfree(sfb);
return ret;
}
/**
* s3c_fb_remove() - Cleanup on module finalisation
* @pdev: The platform device we are bound to.
*
* Shutdown and then release all the resources that the driver allocated
* on initialisation.
*/
static int __devexit s3c_fb_remove(struct platform_device *pdev)
{
struct s3c_fb *sfb = platform_get_drvdata(pdev);
int win;
for (win = 0; win <= S3C_FB_MAX_WIN; win++)
s3c_fb_release_win(sfb, sfb->windows[win]);
iounmap(sfb->regs);
clk_disable(sfb->bus_clk);
clk_put(sfb->bus_clk);
release_resource(sfb->regs_res);
kfree(sfb->regs_res);
kfree(sfb);
return 0;
}
#ifdef CONFIG_PM
static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
{
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_win *win;
int win_no;
for (win_no = S3C_FB_MAX_WIN; win_no >= 0; win_no--) {
win = sfb->windows[win_no];
if (!win)
continue;
/* use the blank function to push into power-down */
s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
}
clk_disable(sfb->bus_clk);
return 0;
}
static int s3c_fb_resume(struct platform_device *pdev)
{
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_win *win;
int win_no;
clk_enable(sfb->bus_clk);
for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
win = sfb->windows[win_no];
if (!win)
continue;
dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
s3c_fb_set_par(win->fbinfo);
}
return 0;
}
#else
#define s3c_fb_suspend NULL
#define s3c_fb_resume NULL
#endif
static struct platform_driver s3c_fb_driver = {
.probe = s3c_fb_probe,
.remove = s3c_fb_remove,
.suspend = s3c_fb_suspend,
.resume = s3c_fb_resume,
.driver = {
.name = "s3c-fb",
.owner = THIS_MODULE,
},
};
static int __init s3c_fb_init(void)
{
return platform_driver_register(&s3c_fb_driver);
}
static void __exit s3c_fb_cleanup(void)
{
platform_driver_unregister(&s3c_fb_driver);
}
module_init(s3c_fb_init);
module_exit(s3c_fb_cleanup);
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c-fb");
