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linux/drivers/video/sm501fb.c
Paul Mundt 1f2b69f9bd [PATCH] fb: sm501fb off-by-1 sysfs store 
Currently sm501fb_crtsrc_store() won't allow the routing to be changed via
echos from userspace in to the sysfs file.  The reason for this is that the
strnicmp() for both heads uses a sizeof() for the string length, which ends
up being strlen() + 1 (\0 in the normal case, but the echo gives a newline,
which is where the issue occurs), this then causes a mismatch and
subsequently bails with the -EINVAL.

In addition to this, the hardcoded lengths were then used for the store
length that was returned, which ended up being erroneous and resulting in a
write error.  There's also no point in returning anything but the full
length since it will -EINVAL out on a mismatch well before then anyways.

sizeof("string") is great for making sure you have space in your buffer,
but rather less so for string comparisons :-)

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-05 07:57:51 -08:00

1787 lines
41 KiB
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/* linux/drivers/video/sm501fb.c
*
* Copyright (c) 2006 Simtec Electronics
* Vincent Sanders <vince@simtec.co.uk>
* Ben Dooks <ben@simtec.co.uk>
*
* 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.
*
* Framebuffer driver for the Silicon Motion SM501
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/wait.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#ifdef CONFIG_PM
#include <linux/pm.h>
#endif
#include <linux/sm501.h>
#include <linux/sm501-regs.h>
#define NR_PALETTE 256
enum sm501_controller {
HEAD_CRT = 0,
HEAD_PANEL = 1,
};
/* SM501 memory adress */
struct sm501_mem {
unsigned long size;
unsigned long sm_addr;
void __iomem *k_addr;
};
/* private data that is shared between all frambuffers* */
struct sm501fb_info {
struct device *dev;
struct fb_info *fb[2]; /* fb info for both heads */
struct resource *fbmem_res; /* framebuffer resource */
struct resource *regs_res; /* registers resource */
struct sm501_platdata_fb *pdata; /* our platform data */
int irq;
int swap_endian; /* set to swap rgb=>bgr */
void __iomem *regs; /* remapped registers */
void __iomem *fbmem; /* remapped framebuffer */
size_t fbmem_len; /* length of remapped region */
};
/* per-framebuffer private data */
struct sm501fb_par {
u32 pseudo_palette[16];
enum sm501_controller head;
struct sm501_mem cursor;
struct sm501_mem screen;
struct fb_ops ops;
void *store_fb;
void *store_cursor;
void __iomem *cursor_regs;
struct sm501fb_info *info;
};
/* Helper functions */
static inline int h_total(struct fb_var_screeninfo *var)
{
return var->xres + var->left_margin +
var->right_margin + var->hsync_len;
}
static inline int v_total(struct fb_var_screeninfo *var)
{
return var->yres + var->upper_margin +
var->lower_margin + var->vsync_len;
}
/* sm501fb_sync_regs()
*
* This call is mainly for PCI bus systems where we need to
* ensure that any writes to the bus are completed before the
* next phase, or after completing a function.
*/
static inline void sm501fb_sync_regs(struct sm501fb_info *info)
{
readl(info->regs);
}
/* sm501_alloc_mem
*
* This is an attempt to lay out memory for the two framebuffers and
* everything else
*
* |fbmem_res->start fbmem_res->end|
* | |
* |fb[0].fix.smem_start | |fb[1].fix.smem_start | 2K |
* |-> fb[0].fix.smem_len <-| spare |-> fb[1].fix.smem_len <-|-> cursors <-|
*
* The "spare" space is for the 2d engine data
* the fixed is space for the cursors (2x1Kbyte)
*
* we need to allocate memory for the 2D acceleration engine
* command list and the data for the engine to deal with.
*
* - all allocations must be 128bit aligned
* - cursors are 64x64x2 bits (1Kbyte)
*
*/
#define SM501_MEMF_CURSOR (1)
#define SM501_MEMF_PANEL (2)
#define SM501_MEMF_CRT (4)
#define SM501_MEMF_ACCEL (8)
static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem,
unsigned int why, size_t size)
{
unsigned int ptr = 0;
switch (why) {
case SM501_MEMF_CURSOR:
ptr = inf->fbmem_len - size;
inf->fbmem_len = ptr;
break;
case SM501_MEMF_PANEL:
ptr = inf->fbmem_len - size;
if (ptr < inf->fb[0]->fix.smem_len)
return -ENOMEM;
break;
case SM501_MEMF_CRT:
ptr = 0;
break;
case SM501_MEMF_ACCEL:
ptr = inf->fb[0]->fix.smem_len;
if ((ptr + size) >
(inf->fb[1]->fix.smem_start - inf->fbmem_res->start))
return -ENOMEM;
break;
default:
return -EINVAL;
}
mem->size = size;
mem->sm_addr = ptr;
mem->k_addr = inf->fbmem + ptr;
dev_dbg(inf->dev, "%s: result %08lx, %p - %u, %zd\n",
__func__, mem->sm_addr, mem->k_addr, why, size);
return 0;
}
/* sm501fb_ps_to_hz
*
* Converts a period in picoseconds to Hz.
*
* Note, we try to keep this in Hz to minimise rounding with
* the limited PLL settings on the SM501.
*/
static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
{
unsigned long long numerator=1000000000000ULL;
/* 10^12 / picosecond period gives frequency in Hz */
do_div(numerator, psvalue);
return (unsigned long)numerator;
}
/* sm501fb_hz_to_ps is identical to the oposite transform */
#define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
/* sm501fb_setup_gamma
*
* Programs a linear 1.0 gamma ramp in case the gamma
* correction is enabled without programming anything else.
*/
static void sm501fb_setup_gamma(struct sm501fb_info *fbi,
unsigned long palette)
{
unsigned long value = 0;
int offset;
/* set gamma values */
for (offset = 0; offset < 256 * 4; offset += 4) {
writel(value, fbi->regs + palette + offset);
value += 0x010101; /* Advance RGB by 1,1,1.*/
}
}
/* sm501fb_check_var
*
* check common variables for both panel and crt
*/
static int sm501fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *sm = par->info;
unsigned long tmp;
/* check we can fit these values into the registers */
if (var->hsync_len > 255 || var->vsync_len > 255)
return -EINVAL;
if ((var->xres + var->right_margin) >= 4096)
return -EINVAL;
if ((var->yres + var->lower_margin) > 2048)
return -EINVAL;
/* hard limits of device */
if (h_total(var) > 4096 || v_total(var) > 2048)
return -EINVAL;
/* check our line length is going to be 128 bit aligned */
tmp = (var->xres * var->bits_per_pixel) / 8;
if ((tmp & 15) != 0)
return -EINVAL;
/* check the virtual size */
if (var->xres_virtual > 4096 || var->yres_virtual > 2048)
return -EINVAL;
/* can cope with 8,16 or 32bpp */
if (var->bits_per_pixel <= 8)
var->bits_per_pixel = 8;
else if (var->bits_per_pixel <= 16)
var->bits_per_pixel = 16;
else if (var->bits_per_pixel == 24)
var->bits_per_pixel = 32;
/* set r/g/b positions and validate bpp */
switch(var->bits_per_pixel) {
case 8:
var->red.length = var->bits_per_pixel;
var->red.offset = 0;
var->green.length = var->bits_per_pixel;
var->green.offset = 0;
var->blue.length = var->bits_per_pixel;
var->blue.offset = 0;
var->transp.length = 0;
break;
case 16:
if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
} else {
var->blue.offset = 11;
var->green.offset = 5;
var->red.offset = 0;
}
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
var->transp.length = 0;
break;
case 32:
if (sm->pdata->flags & SM501_FBPD_SWAP_FB_ENDIAN) {
var->transp.offset = 0;
var->red.offset = 8;
var->green.offset = 16;
var->blue.offset = 24;
} else {
var->transp.offset = 24;
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
}
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 0;
break;
default:
return -EINVAL;
}
return 0;
}
/*
* sm501fb_check_var_crt():
*
* check the parameters for the CRT head, and either bring them
* back into range, or return -EINVAL.
*/
static int sm501fb_check_var_crt(struct fb_var_screeninfo *var,
struct fb_info *info)
{
return sm501fb_check_var(var, info);
}
/* sm501fb_check_var_pnl():
*
* check the parameters for the CRT head, and either bring them
* back into range, or return -EINVAL.
*/
static int sm501fb_check_var_pnl(struct fb_var_screeninfo *var,
struct fb_info *info)
{
return sm501fb_check_var(var, info);
}
/* sm501fb_set_par_common
*
* set common registers for framebuffers
*/
static int sm501fb_set_par_common(struct fb_info *info,
struct fb_var_screeninfo *var)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
unsigned long pixclock; /* pixelclock in Hz */
unsigned long sm501pixclock; /* pixelclock the 501 can achive in Hz */
unsigned int mem_type;
unsigned int clock_type;
unsigned int head_addr;
dev_dbg(fbi->dev, "%s: %dx%d, bpp = %d, virtual %dx%d\n",
__func__, var->xres, var->yres, var->bits_per_pixel,
var->xres_virtual, var->yres_virtual);
switch (par->head) {
case HEAD_CRT:
mem_type = SM501_MEMF_CRT;
clock_type = SM501_CLOCK_V2XCLK;
head_addr = SM501_DC_CRT_FB_ADDR;
break;
case HEAD_PANEL:
mem_type = SM501_MEMF_PANEL;
clock_type = SM501_CLOCK_P2XCLK;
head_addr = SM501_DC_PANEL_FB_ADDR;
break;
default:
mem_type = 0; /* stop compiler warnings */
head_addr = 0;
clock_type = 0;
}
switch (var->bits_per_pixel) {
case 8:
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
case 16:
info->fix.visual = FB_VISUAL_DIRECTCOLOR;
break;
case 32:
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
}
/* allocate fb memory within 501 */
info->fix.line_length = (var->xres_virtual * var->bits_per_pixel)/8;
info->fix.smem_len = info->fix.line_length * var->yres_virtual;
dev_dbg(fbi->dev, "%s: line length = %u\n", __func__,
info->fix.line_length);
if (sm501_alloc_mem(fbi, &par->screen, mem_type,
info->fix.smem_len)) {
dev_err(fbi->dev, "no memory available\n");
return -ENOMEM;
}
info->fix.smem_start = fbi->fbmem_res->start + par->screen.sm_addr;
info->screen_base = fbi->fbmem + par->screen.sm_addr;
info->screen_size = info->fix.smem_len;
/* set start of framebuffer to the screen */
writel(par->screen.sm_addr | SM501_ADDR_FLIP, fbi->regs + head_addr);
/* program CRT clock */
pixclock = sm501fb_ps_to_hz(var->pixclock);
sm501pixclock = sm501_set_clock(fbi->dev->parent, clock_type,
pixclock);
/* update fb layer with actual clock used */
var->pixclock = sm501fb_hz_to_ps(sm501pixclock);
dev_dbg(fbi->dev, "%s: pixclock(ps) = %u, pixclock(Hz) = %lu, "
"sm501pixclock = %lu, error = %ld%%\n",
__func__, var->pixclock, pixclock, sm501pixclock,
((pixclock - sm501pixclock)*100)/pixclock);
return 0;
}
/* sm501fb_set_par_geometry
*
* set the geometry registers for specified framebuffer.
*/
static void sm501fb_set_par_geometry(struct fb_info *info,
struct fb_var_screeninfo *var)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
void __iomem *base = fbi->regs;
unsigned long reg;
if (par->head == HEAD_CRT)
base += SM501_DC_CRT_H_TOT;
else
base += SM501_DC_PANEL_H_TOT;
/* set framebuffer width and display width */
reg = info->fix.line_length;
reg |= ((var->xres * var->bits_per_pixel)/8) << 16;
writel(reg, fbi->regs + (par->head == HEAD_CRT ?
SM501_DC_CRT_FB_OFFSET : SM501_DC_PANEL_FB_OFFSET));
/* program horizontal total */
reg = (h_total(var) - 1) << 16;
reg |= (var->xres - 1);
writel(reg, base + SM501_OFF_DC_H_TOT);
/* program horizontal sync */
reg = var->hsync_len << 16;
reg |= var->xres + var->right_margin - 1;
writel(reg, base + SM501_OFF_DC_H_SYNC);
/* program vertical total */
reg = (v_total(var) - 1) << 16;
reg |= (var->yres - 1);
writel(reg, base + SM501_OFF_DC_V_TOT);
/* program vertical sync */
reg = var->vsync_len << 16;
reg |= var->yres + var->lower_margin - 1;
writel(reg, base + SM501_OFF_DC_V_SYNC);
}
/* sm501fb_pan_crt
*
* pan the CRT display output within an virtual framebuffer
*/
static int sm501fb_pan_crt(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
unsigned int bytes_pixel = var->bits_per_pixel / 8;
unsigned long reg;
unsigned long xoffs;
xoffs = var->xoffset * bytes_pixel;
reg = readl(fbi->regs + SM501_DC_CRT_CONTROL);
reg &= ~SM501_DC_CRT_CONTROL_PIXEL_MASK;
reg |= ((xoffs & 15) / bytes_pixel) << 4;
writel(reg, fbi->regs + SM501_DC_CRT_CONTROL);
reg = (par->screen.sm_addr + xoffs +
var->yoffset * info->fix.line_length);
writel(reg | SM501_ADDR_FLIP, fbi->regs + SM501_DC_CRT_FB_ADDR);
sm501fb_sync_regs(fbi);
return 0;
}
/* sm501fb_pan_pnl
*
* pan the panel display output within an virtual framebuffer
*/
static int sm501fb_pan_pnl(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
unsigned long reg;
reg = var->xoffset | (var->xres_virtual << 16);
writel(reg, fbi->regs + SM501_DC_PANEL_FB_WIDTH);
reg = var->yoffset | (var->yres_virtual << 16);
writel(reg, fbi->regs + SM501_DC_PANEL_FB_HEIGHT);
sm501fb_sync_regs(fbi);
return 0;
}
/* sm501fb_set_par_crt
*
* Set the CRT video mode from the fb_info structure
*/
static int sm501fb_set_par_crt(struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
struct fb_var_screeninfo *var = &info->var;
unsigned long control; /* control register */
int ret;
/* activate new configuration */
dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
/* enable CRT DAC - note 0 is on!*/
sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
control = readl(fbi->regs + SM501_DC_CRT_CONTROL);
control &= (SM501_DC_CRT_CONTROL_PIXEL_MASK |
SM501_DC_CRT_CONTROL_GAMMA |
SM501_DC_CRT_CONTROL_BLANK |
SM501_DC_CRT_CONTROL_SEL |
SM501_DC_CRT_CONTROL_CP |
SM501_DC_CRT_CONTROL_TVP);
/* set the sync polarities before we check data source */
if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
control |= SM501_DC_CRT_CONTROL_HSP;
if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
control |= SM501_DC_CRT_CONTROL_VSP;
if ((control & SM501_DC_CRT_CONTROL_SEL) == 0) {
/* the head is displaying panel data... */
sm501_alloc_mem(fbi, &par->screen, SM501_MEMF_CRT, 0);
goto out_update;
}
ret = sm501fb_set_par_common(info, var);
if (ret) {
dev_err(fbi->dev, "failed to set common parameters\n");
return ret;
}
sm501fb_pan_crt(var, info);
sm501fb_set_par_geometry(info, var);
control |= SM501_FIFO_3; /* fill if >3 free slots */
switch(var->bits_per_pixel) {
case 8:
control |= SM501_DC_CRT_CONTROL_8BPP;
break;
case 16:
control |= SM501_DC_CRT_CONTROL_16BPP;
break;
case 32:
control |= SM501_DC_CRT_CONTROL_32BPP;
sm501fb_setup_gamma(fbi, SM501_DC_CRT_PALETTE);
break;
default:
BUG();
}
control |= SM501_DC_CRT_CONTROL_SEL; /* CRT displays CRT data */
control |= SM501_DC_CRT_CONTROL_TE; /* enable CRT timing */
control |= SM501_DC_CRT_CONTROL_ENABLE; /* enable CRT plane */
out_update:
dev_dbg(fbi->dev, "new control is %08lx\n", control);
writel(control, fbi->regs + SM501_DC_CRT_CONTROL);
sm501fb_sync_regs(fbi);
return 0;
}
static void sm501fb_panel_power(struct sm501fb_info *fbi, int to)
{
unsigned long control;
void __iomem *ctrl_reg = fbi->regs + SM501_DC_PANEL_CONTROL;
control = readl(ctrl_reg);
if (to && (control & SM501_DC_PANEL_CONTROL_VDD) == 0) {
/* enable panel power */
control |= SM501_DC_PANEL_CONTROL_VDD; /* FPVDDEN */
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control |= SM501_DC_PANEL_CONTROL_DATA; /* DATA */
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control |= SM501_DC_PANEL_CONTROL_BIAS; /* VBIASEN */
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control |= SM501_DC_PANEL_CONTROL_FPEN;
writel(control, ctrl_reg);
} else if (!to && (control & SM501_DC_PANEL_CONTROL_VDD) != 0) {
/* disable panel power */
control &= ~SM501_DC_PANEL_CONTROL_FPEN;
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control &= ~SM501_DC_PANEL_CONTROL_BIAS;
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control &= ~SM501_DC_PANEL_CONTROL_DATA;
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
control &= ~SM501_DC_PANEL_CONTROL_VDD;
writel(control, ctrl_reg);
sm501fb_sync_regs(fbi);
mdelay(10);
}
sm501fb_sync_regs(fbi);
}
/* sm501fb_set_par_pnl
*
* Set the panel video mode from the fb_info structure
*/
static int sm501fb_set_par_pnl(struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
struct fb_var_screeninfo *var = &info->var;
unsigned long control;
unsigned long reg;
int ret;
dev_dbg(fbi->dev, "%s(%p)\n", __func__, info);
/* activate this new configuration */
ret = sm501fb_set_par_common(info, var);
if (ret)
return ret;
sm501fb_pan_pnl(var, info);
sm501fb_set_par_geometry(info, var);
/* update control register */
control = readl(fbi->regs + SM501_DC_PANEL_CONTROL);
control &= (SM501_DC_PANEL_CONTROL_GAMMA |
SM501_DC_PANEL_CONTROL_VDD |
SM501_DC_PANEL_CONTROL_DATA |
SM501_DC_PANEL_CONTROL_BIAS |
SM501_DC_PANEL_CONTROL_FPEN |
SM501_DC_PANEL_CONTROL_CP |
SM501_DC_PANEL_CONTROL_CK |
SM501_DC_PANEL_CONTROL_HP |
SM501_DC_PANEL_CONTROL_VP |
SM501_DC_PANEL_CONTROL_HPD |
SM501_DC_PANEL_CONTROL_VPD);
control |= SM501_FIFO_3; /* fill if >3 free slots */
switch(var->bits_per_pixel) {
case 8:
control |= SM501_DC_PANEL_CONTROL_8BPP;
break;
case 16:
control |= SM501_DC_PANEL_CONTROL_16BPP;
break;
case 32:
control |= SM501_DC_PANEL_CONTROL_32BPP;
sm501fb_setup_gamma(fbi, SM501_DC_PANEL_PALETTE);
break;
default:
BUG();
}
writel(0x0, fbi->regs + SM501_DC_PANEL_PANNING_CONTROL);
/* panel plane top left and bottom right location */
writel(0x00, fbi->regs + SM501_DC_PANEL_TL_LOC);
reg = var->xres - 1;
reg |= (var->yres - 1) << 16;
writel(reg, fbi->regs + SM501_DC_PANEL_BR_LOC);
/* program panel control register */
control |= SM501_DC_PANEL_CONTROL_TE; /* enable PANEL timing */
control |= SM501_DC_PANEL_CONTROL_EN; /* enable PANEL gfx plane */
if ((var->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
control |= SM501_DC_PANEL_CONTROL_HSP;
if ((var->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
control |= SM501_DC_PANEL_CONTROL_VSP;
writel(control, fbi->regs + SM501_DC_PANEL_CONTROL);
sm501fb_sync_regs(fbi);
/* power the panel up */
sm501fb_panel_power(fbi, 1);
return 0;
}
/* chan_to_field
*
* convert a colour value into a field position
*
* from pxafb.c
*/
static inline unsigned int chan_to_field(unsigned int chan,
struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
/* sm501fb_setcolreg
*
* set the colour mapping for modes that support palettised data
*/
static int sm501fb_setcolreg(unsigned regno,
unsigned red, unsigned green, unsigned blue,
unsigned transp, struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
void __iomem *base = fbi->regs;
unsigned int val;
if (par->head == HEAD_CRT)
base += SM501_DC_CRT_PALETTE;
else
base += SM501_DC_PANEL_PALETTE;
switch (info->fix.visual) {
case FB_VISUAL_TRUECOLOR:
/* true-colour, use pseuo-palette */
if (regno < 16) {
u32 *pal = par->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 < 256) {
val = (red >> 8) << 16;
val |= (green >> 8) << 8;
val |= blue >> 8;
writel(val, base + (regno * 4));
}
break;
default:
return 1; /* unknown type */
}
return 0;
}
/* sm501fb_blank_pnl
*
* Blank or un-blank the panel interface
*/
static int sm501fb_blank_pnl(int blank_mode, struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
switch (blank_mode) {
case FB_BLANK_POWERDOWN:
sm501fb_panel_power(fbi, 0);
break;
case FB_BLANK_UNBLANK:
sm501fb_panel_power(fbi, 1);
break;
case FB_BLANK_NORMAL:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
default:
return 1;
}
return 0;
}
/* sm501fb_blank_crt
*
* Blank or un-blank the crt interface
*/
static int sm501fb_blank_crt(int blank_mode, struct fb_info *info)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
unsigned long ctrl;
dev_dbg(fbi->dev, "%s(mode=%d, %p)\n", __func__, blank_mode, info);
ctrl = readl(fbi->regs + SM501_DC_CRT_CONTROL);
switch (blank_mode) {
case FB_BLANK_POWERDOWN:
ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
sm501_misc_control(fbi->dev->parent, SM501_MISC_DAC_POWER, 0);
case FB_BLANK_NORMAL:
ctrl |= SM501_DC_CRT_CONTROL_BLANK;
break;
case FB_BLANK_UNBLANK:
ctrl &= ~SM501_DC_CRT_CONTROL_BLANK;
ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
sm501_misc_control(fbi->dev->parent, 0, SM501_MISC_DAC_POWER);
break;
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
default:
return 1;
}
writel(ctrl, fbi->regs + SM501_DC_CRT_CONTROL);
sm501fb_sync_regs(fbi);
return 0;
}
/* sm501fb_cursor
*
* set or change the hardware cursor parameters
*/
static int sm501fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
struct sm501fb_par *par = info->par;
struct sm501fb_info *fbi = par->info;
void __iomem *base = fbi->regs;
unsigned long hwc_addr;
unsigned long fg, bg;
dev_dbg(fbi->dev, "%s(%p,%p)\n", __func__, info, cursor);
if (par->head == HEAD_CRT)
base += SM501_DC_CRT_HWC_BASE;
else
base += SM501_DC_PANEL_HWC_BASE;
/* check not being asked to exceed capabilities */
if (cursor->image.width > 64)
return -EINVAL;
if (cursor->image.height > 64)
return -EINVAL;
if (cursor->image.depth > 1)
return -EINVAL;
hwc_addr = readl(base + SM501_OFF_HWC_ADDR);
if (cursor->enable)
writel(hwc_addr | SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
else
writel(hwc_addr & ~SM501_HWC_EN, base + SM501_OFF_HWC_ADDR);
/* set data */
if (cursor->set & FB_CUR_SETPOS) {
unsigned int x = cursor->image.dx;
unsigned int y = cursor->image.dy;
if (x >= 2048 || y >= 2048 )
return -EINVAL;
dev_dbg(fbi->dev, "set position %d,%d\n", x, y);
//y += cursor->image.height;
writel(x | (y << 16), base + SM501_OFF_HWC_LOC);
}
if (cursor->set & FB_CUR_SETCMAP) {
unsigned int bg_col = cursor->image.bg_color;
unsigned int fg_col = cursor->image.fg_color;
dev_dbg(fbi->dev, "%s: update cmap (%08x,%08x)\n",
__func__, bg_col, fg_col);
bg = ((info->cmap.red[bg_col] & 0xF8) << 8) |
((info->cmap.green[bg_col] & 0xFC) << 3) |
((info->cmap.blue[bg_col] & 0xF8) >> 3);
fg = ((info->cmap.red[fg_col] & 0xF8) << 8) |
((info->cmap.green[fg_col] & 0xFC) << 3) |
((info->cmap.blue[fg_col] & 0xF8) >> 3);
dev_dbg(fbi->dev, "fgcol %08x, bgcol %08x\n", fg, bg);
writel(bg, base + SM501_OFF_HWC_COLOR_1_2);
writel(fg, base + SM501_OFF_HWC_COLOR_3);
}
if (cursor->set & FB_CUR_SETSIZE ||
cursor->set & (FB_CUR_SETIMAGE | FB_CUR_SETSHAPE)) {
/* SM501 cursor is a two bpp 64x64 bitmap this routine
* clears it to transparent then combines the cursor
* shape plane with the colour plane to set the
* cursor */
int x, y;
const unsigned char *pcol = cursor->image.data;
const unsigned char *pmsk = cursor->mask;
void __iomem *dst = par->cursor.k_addr;
unsigned char dcol = 0;
unsigned char dmsk = 0;
unsigned int op;
dev_dbg(fbi->dev, "%s: setting shape (%d,%d)\n",
__func__, cursor->image.width, cursor->image.height);
for (op = 0; op < (64*64*2)/8; op+=4)
writel(0x0, dst + op);
for (y = 0; y < cursor->image.height; y++) {
for (x = 0; x < cursor->image.width; x++) {
if ((x % 8) == 0) {
dcol = *pcol++;
dmsk = *pmsk++;
} else {
dcol >>= 1;
dmsk >>= 1;
}
if (dmsk & 1) {
op = (dcol & 1) ? 1 : 3;
op <<= ((x % 4) * 2);
op |= readb(dst + (x / 4));
writeb(op, dst + (x / 4));
}
}
dst += (64*2)/8;
}
}
sm501fb_sync_regs(fbi); /* ensure cursor data flushed */
return 0;
}
/* sm501fb_crtsrc_show
*
* device attribute code to show where the crt output is sourced from
*/
static ssize_t sm501fb_crtsrc_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sm501fb_info *info = dev_get_drvdata(dev);
unsigned long ctrl;
ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
ctrl &= SM501_DC_CRT_CONTROL_SEL;
return snprintf(buf, PAGE_SIZE, "%s\n", ctrl ? "crt" : "panel");
}
/* sm501fb_crtsrc_show
*
* device attribute code to set where the crt output is sourced from
*/
static ssize_t sm501fb_crtsrc_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct sm501fb_info *info = dev_get_drvdata(dev);
enum sm501_controller head;
unsigned long ctrl;
if (len < 1)
return -EINVAL;
if (strnicmp(buf, "crt", 3) == 0)
head = HEAD_CRT;
else if (strnicmp(buf, "panel", 5) == 0)
head = HEAD_PANEL;
else
return -EINVAL;
dev_info(dev, "setting crt source to head %d\n", head);
ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
if (head == HEAD_CRT) {
ctrl |= SM501_DC_CRT_CONTROL_SEL;
ctrl |= SM501_DC_CRT_CONTROL_ENABLE;
ctrl |= SM501_DC_CRT_CONTROL_TE;
} else {
ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
ctrl &= ~SM501_DC_CRT_CONTROL_ENABLE;
ctrl &= ~SM501_DC_CRT_CONTROL_TE;
}
writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
sm501fb_sync_regs(info);
return len;
}
/* Prepare the device_attr for registration with sysfs later */
static DEVICE_ATTR(crt_src, 0666, sm501fb_crtsrc_show, sm501fb_crtsrc_store);
/* sm501fb_show_regs
*
* show the primary sm501 registers
*/
static int sm501fb_show_regs(struct sm501fb_info *info, char *ptr,
unsigned int start, unsigned int len)
{
void __iomem *mem = info->regs;
char *buf = ptr;
unsigned int reg;
for (reg = start; reg < (len + start); reg += 4)
ptr += sprintf(ptr, "%08x = %08x\n", reg, readl(mem + reg));
return ptr - buf;
}
/* sm501fb_debug_show_crt
*
* show the crt control and cursor registers
*/
static ssize_t sm501fb_debug_show_crt(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sm501fb_info *info = dev_get_drvdata(dev);
char *ptr = buf;
ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_CONTROL, 0x40);
ptr += sm501fb_show_regs(info, ptr, SM501_DC_CRT_HWC_BASE, 0x10);
return ptr - buf;
}
static DEVICE_ATTR(fbregs_crt, 0444, sm501fb_debug_show_crt, NULL);
/* sm501fb_debug_show_pnl
*
* show the panel control and cursor registers
*/
static ssize_t sm501fb_debug_show_pnl(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sm501fb_info *info = dev_get_drvdata(dev);
char *ptr = buf;
ptr += sm501fb_show_regs(info, ptr, 0x0, 0x40);
ptr += sm501fb_show_regs(info, ptr, SM501_DC_PANEL_HWC_BASE, 0x10);
return ptr - buf;
}
static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
/* framebuffer ops */
static struct fb_ops sm501fb_ops_crt = {
.owner = THIS_MODULE,
.fb_check_var = sm501fb_check_var_crt,
.fb_set_par = sm501fb_set_par_crt,
.fb_blank = sm501fb_blank_crt,
.fb_setcolreg = sm501fb_setcolreg,
.fb_pan_display = sm501fb_pan_crt,
.fb_cursor = sm501fb_cursor,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static struct fb_ops sm501fb_ops_pnl = {
.owner = THIS_MODULE,
.fb_check_var = sm501fb_check_var_pnl,
.fb_set_par = sm501fb_set_par_pnl,
.fb_pan_display = sm501fb_pan_pnl,
.fb_blank = sm501fb_blank_pnl,
.fb_setcolreg = sm501fb_setcolreg,
.fb_cursor = sm501fb_cursor,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/* sm501fb_info_alloc
*
* creates and initialises an sm501fb_info structure
*/
static struct sm501fb_info *sm501fb_info_alloc(struct fb_info *fbinfo_crt,
struct fb_info *fbinfo_pnl)
{
struct sm501fb_info *info;
struct sm501fb_par *par;
info = kzalloc(sizeof(struct sm501fb_info), GFP_KERNEL);
if (info) {
/* set the references back */
par = fbinfo_crt->par;
par->info = info;
par->head = HEAD_CRT;
fbinfo_crt->pseudo_palette = &par->pseudo_palette;
par = fbinfo_pnl->par;
par->info = info;
par->head = HEAD_PANEL;
fbinfo_pnl->pseudo_palette = &par->pseudo_palette;
/* store the two fbs into our info */
info->fb[HEAD_CRT] = fbinfo_crt;
info->fb[HEAD_PANEL] = fbinfo_pnl;
}
return info;
}
/* sm501_init_cursor
*
* initialise hw cursor parameters
*/
static int sm501_init_cursor(struct fb_info *fbi, unsigned int reg_base)
{
struct sm501fb_par *par = fbi->par;
struct sm501fb_info *info = par->info;
int ret;
par->cursor_regs = info->regs + reg_base;
ret = sm501_alloc_mem(info, &par->cursor, SM501_MEMF_CURSOR, 1024);
if (ret < 0)
return ret;
/* initialise the colour registers */
writel(par->cursor.sm_addr, par->cursor_regs + SM501_OFF_HWC_ADDR);
writel(0x00, par->cursor_regs + SM501_OFF_HWC_LOC);
writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_1_2);
writel(0x00, par->cursor_regs + SM501_OFF_HWC_COLOR_3);
sm501fb_sync_regs(info);
return 0;
}
/* sm501fb_info_start
*
* fills the par structure claiming resources and remapping etc.
*/
static int sm501fb_start(struct sm501fb_info *info,
struct platform_device *pdev)
{
struct resource *res;
struct device *dev;
int ret;
info->dev = dev = &pdev->dev;
platform_set_drvdata(pdev, info);
info->irq = ret = platform_get_irq(pdev, 0);
if (ret < 0) {
/* we currently do not use the IRQ */
dev_warn(dev, "no irq for device\n");
}
/* allocate, reserve and remap resources for registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "no resource definition for registers\n");
ret = -ENOENT;
goto err_release;
}
info->regs_res = request_mem_region(res->start,
res->end - res->start,
pdev->name);
if (info->regs_res == NULL) {
dev_err(dev, "cannot claim registers\n");
ret = -ENXIO;
goto err_release;
}
info->regs = ioremap(res->start, (res->end - res->start)+1);
if (info->regs == NULL) {
dev_err(dev, "cannot remap registers\n");
ret = -ENXIO;
goto err_regs_res;
}
/* allocate, reserve resources for framebuffer */
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (res == NULL) {
dev_err(dev, "no memory resource defined\n");
ret = -ENXIO;
goto err_regs_map;
}
info->fbmem_res = request_mem_region(res->start,
(res->end - res->start)+1,
pdev->name);
if (info->fbmem_res == NULL) {
dev_err(dev, "cannot claim framebuffer\n");
ret = -ENXIO;
goto err_regs_map;
}
info->fbmem = ioremap(res->start, (res->end - res->start)+1);
if (info->fbmem == NULL) {
dev_err(dev, "cannot remap framebuffer\n");
goto err_mem_res;
}
info->fbmem_len = (res->end - res->start)+1;
/* enable display controller */
sm501_unit_power(dev->parent, SM501_GATE_DISPLAY, 1);
/* setup cursors */
sm501_init_cursor(info->fb[HEAD_CRT], SM501_DC_CRT_HWC_ADDR);
sm501_init_cursor(info->fb[HEAD_PANEL], SM501_DC_PANEL_HWC_ADDR);
return 0; /* everything is setup */
err_mem_res:
release_resource(info->fbmem_res);
kfree(info->fbmem_res);
err_regs_map:
iounmap(info->regs);
err_regs_res:
release_resource(info->regs_res);
kfree(info->regs_res);
err_release:
return ret;
}
static void sm501fb_stop(struct sm501fb_info *info)
{
/* disable display controller */
sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
iounmap(info->fbmem);
release_resource(info->fbmem_res);
kfree(info->fbmem_res);
iounmap(info->regs);
release_resource(info->regs_res);
kfree(info->regs_res);
}
static void sm501fb_info_release(struct sm501fb_info *info)
{
kfree(info);
}
static int sm501fb_init_fb(struct fb_info *fb,
enum sm501_controller head,
const char *fbname)
{
struct sm501_platdata_fbsub *pd;
struct sm501fb_par *par = fb->par;
struct sm501fb_info *info = par->info;
unsigned long ctrl;
unsigned int enable;
int ret;
switch (head) {
case HEAD_CRT:
pd = info->pdata->fb_crt;
ctrl = readl(info->regs + SM501_DC_CRT_CONTROL);
enable = (ctrl & SM501_DC_CRT_CONTROL_ENABLE) ? 1 : 0;
/* ensure we set the correct source register */
if (info->pdata->fb_route != SM501_FB_CRT_PANEL) {
ctrl |= SM501_DC_CRT_CONTROL_SEL;
writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
}
break;
case HEAD_PANEL:
pd = info->pdata->fb_pnl;
ctrl = readl(info->regs + SM501_DC_PANEL_CONTROL);
enable = (ctrl & SM501_DC_PANEL_CONTROL_EN) ? 1 : 0;
break;
default:
pd = NULL; /* stop compiler warnings */
ctrl = 0;
enable = 0;
BUG();
}
dev_info(info->dev, "fb %s %sabled at start\n",
fbname, enable ? "en" : "dis");
/* check to see if our routing allows this */
if (head == HEAD_CRT && info->pdata->fb_route == SM501_FB_CRT_PANEL) {
ctrl &= ~SM501_DC_CRT_CONTROL_SEL;
writel(ctrl, info->regs + SM501_DC_CRT_CONTROL);
enable = 0;
}
strlcpy(fb->fix.id, fbname, sizeof(fb->fix.id));
memcpy(&par->ops,
(head == HEAD_CRT) ? &sm501fb_ops_crt : &sm501fb_ops_pnl,
sizeof(struct fb_ops));
/* update ops dependant on what we've been passed */
if ((pd->flags & SM501FB_FLAG_USE_HWCURSOR) == 0)
par->ops.fb_cursor = NULL;
fb->fbops = &par->ops;
fb->flags = FBINFO_FLAG_DEFAULT |
FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
/* fixed data */
fb->fix.type = FB_TYPE_PACKED_PIXELS;
fb->fix.type_aux = 0;
fb->fix.xpanstep = 1;
fb->fix.ypanstep = 1;
fb->fix.ywrapstep = 0;
fb->fix.accel = FB_ACCEL_NONE;
/* screenmode */
fb->var.nonstd = 0;
fb->var.activate = FB_ACTIVATE_NOW;
fb->var.accel_flags = 0;
fb->var.vmode = FB_VMODE_NONINTERLACED;
fb->var.bits_per_pixel = 16;
if (enable && (pd->flags & SM501FB_FLAG_USE_INIT_MODE) && 0) {
/* TODO read the mode from the current display */
} else {
if (pd->def_mode) {
dev_info(info->dev, "using supplied mode\n");
fb_videomode_to_var(&fb->var, pd->def_mode);
fb->var.bits_per_pixel = pd->def_bpp ? pd->def_bpp : 8;
fb->var.xres_virtual = fb->var.xres;
fb->var.yres_virtual = fb->var.yres;
} else {
ret = fb_find_mode(&fb->var, fb,
NULL, NULL, 0, NULL, 8);
if (ret == 0 || ret == 4) {
dev_err(info->dev,
"failed to get initial mode\n");
return -EINVAL;
}
}
}
/* initialise and set the palette */
fb_alloc_cmap(&fb->cmap, NR_PALETTE, 0);
fb_set_cmap(&fb->cmap, fb);
ret = (fb->fbops->fb_check_var)(&fb->var, fb);
if (ret)
dev_err(info->dev, "check_var() failed on initial setup?\n");
/* ensure we've activated our new configuration */
(fb->fbops->fb_set_par)(fb);
return 0;
}
/* default platform data if none is supplied (ie, PCI device) */
static struct sm501_platdata_fbsub sm501fb_pdata_crt = {
.flags = (SM501FB_FLAG_USE_INIT_MODE |
SM501FB_FLAG_USE_HWCURSOR |
SM501FB_FLAG_USE_HWACCEL |
SM501FB_FLAG_DISABLE_AT_EXIT),
};
static struct sm501_platdata_fbsub sm501fb_pdata_pnl = {
.flags = (SM501FB_FLAG_USE_INIT_MODE |
SM501FB_FLAG_USE_HWCURSOR |
SM501FB_FLAG_USE_HWACCEL |
SM501FB_FLAG_DISABLE_AT_EXIT),
};
static struct sm501_platdata_fb sm501fb_def_pdata = {
.fb_route = SM501_FB_OWN,
.fb_crt = &sm501fb_pdata_crt,
.fb_pnl = &sm501fb_pdata_pnl,
};
static char driver_name_crt[] = "sm501fb-crt";
static char driver_name_pnl[] = "sm501fb-panel";
static int __init sm501fb_probe(struct platform_device *pdev)
{
struct sm501fb_info *info;
struct device *dev = &pdev->dev;
struct fb_info *fbinfo_crt;
struct fb_info *fbinfo_pnl;
int ret;
/* allocate our framebuffers */
fbinfo_crt = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
if (fbinfo_crt == NULL) {
dev_err(dev, "cannot allocate crt framebuffer\n");
return -ENOMEM;
}
fbinfo_pnl = framebuffer_alloc(sizeof(struct sm501fb_par), dev);
if (fbinfo_pnl == NULL) {
dev_err(dev, "cannot allocate panel framebuffer\n");
ret = -ENOMEM;
goto fbinfo_crt_alloc_fail;
}
info = sm501fb_info_alloc(fbinfo_crt, fbinfo_pnl);
if (info == NULL) {
dev_err(dev, "cannot allocate par\n");
ret = -ENOMEM;
goto sm501fb_alloc_fail;
}
if (dev->parent->platform_data) {
struct sm501_platdata *pd = dev->parent->platform_data;
info->pdata = pd->fb;
}
if (info->pdata == NULL) {
dev_info(dev, "using default configuration data\n");
info->pdata = &sm501fb_def_pdata;
}
/* start the framebuffers */
ret = sm501fb_start(info, pdev);
if (ret) {
dev_err(dev, "cannot initialise SM501\n");
goto sm501fb_start_fail;
}
/* CRT framebuffer setup */
ret = sm501fb_init_fb(fbinfo_crt, HEAD_CRT, driver_name_crt);
if (ret) {
dev_err(dev, "cannot initialise CRT fb\n");
goto sm501fb_start_fail;
}
/* Panel framebuffer setup */
ret = sm501fb_init_fb(fbinfo_pnl, HEAD_PANEL, driver_name_pnl);
if (ret) {
dev_err(dev, "cannot initialise Panel fb\n");
goto sm501fb_start_fail;
}
/* register framebuffers */
ret = register_framebuffer(fbinfo_crt);
if (ret < 0) {
dev_err(dev, "failed to register CRT fb (%d)\n", ret);
goto register_crt_fail;
}
ret = register_framebuffer(fbinfo_pnl);
if (ret < 0) {
dev_err(dev, "failed to register panel fb (%d)\n", ret);
goto register_pnl_fail;
}
dev_info(dev, "fb%d: %s frame buffer device\n",
fbinfo_crt->node, fbinfo_crt->fix.id);
dev_info(dev, "fb%d: %s frame buffer device\n",
fbinfo_pnl->node, fbinfo_pnl->fix.id);
/* create device files */
ret = device_create_file(dev, &dev_attr_crt_src);
if (ret)
goto crtsrc_fail;
ret = device_create_file(dev, &dev_attr_fbregs_pnl);
if (ret)
goto fbregs_pnl_fail;
ret = device_create_file(dev, &dev_attr_fbregs_crt);
if (ret)
goto fbregs_crt_fail;
/* we registered, return ok */
return 0;
fbregs_crt_fail:
device_remove_file(dev, &dev_attr_fbregs_pnl);
fbregs_pnl_fail:
device_remove_file(dev, &dev_attr_crt_src);
crtsrc_fail:
unregister_framebuffer(fbinfo_pnl);
register_pnl_fail:
unregister_framebuffer(fbinfo_crt);
register_crt_fail:
sm501fb_stop(info);
sm501fb_start_fail:
sm501fb_info_release(info);
sm501fb_alloc_fail:
framebuffer_release(fbinfo_pnl);
fbinfo_crt_alloc_fail:
framebuffer_release(fbinfo_crt);
return ret;
}
/*
* Cleanup
*/
static int sm501fb_remove(struct platform_device *pdev)
{
struct sm501fb_info *info = platform_get_drvdata(pdev);
struct fb_info *fbinfo_crt = info->fb[0];
struct fb_info *fbinfo_pnl = info->fb[1];
device_remove_file(&pdev->dev, &dev_attr_fbregs_crt);
device_remove_file(&pdev->dev, &dev_attr_fbregs_pnl);
device_remove_file(&pdev->dev, &dev_attr_crt_src);
unregister_framebuffer(fbinfo_crt);
unregister_framebuffer(fbinfo_pnl);
sm501fb_stop(info);
sm501fb_info_release(info);
framebuffer_release(fbinfo_pnl);
framebuffer_release(fbinfo_crt);
return 0;
}
#ifdef CONFIG_PM
static int sm501fb_suspend_fb(struct sm501fb_info *info,
enum sm501_controller head)
{
struct fb_info *fbi = info->fb[head];
struct sm501fb_par *par = fbi->par;
if (par->screen.size == 0)
return 0;
/* backup copies in case chip is powered down over suspend */
par->store_fb = vmalloc(par->screen.size);
if (par->store_fb == NULL) {
dev_err(info->dev, "no memory to store screen\n");
return -ENOMEM;
}
par->store_cursor = vmalloc(par->cursor.size);
if (par->store_cursor == NULL) {
dev_err(info->dev, "no memory to store cursor\n");
goto err_nocursor;
}
memcpy_fromio(par->store_fb, par->screen.k_addr, par->screen.size);
memcpy_fromio(par->store_cursor, par->cursor.k_addr, par->cursor.size);
/* blank the relevant interface to ensure unit power minimised */
(par->ops.fb_blank)(FB_BLANK_POWERDOWN, fbi);
return 0;
err_nocursor:
vfree(par->store_fb);
return -ENOMEM;
}
static void sm501fb_resume_fb(struct sm501fb_info *info,
enum sm501_controller head)
{
struct fb_info *fbi = info->fb[head];
struct sm501fb_par *par = fbi->par;
if (par->screen.size == 0)
return;
/* re-activate the configuration */
(par->ops.fb_set_par)(fbi);
/* restore the data */
memcpy_toio(par->screen.k_addr, par->store_fb, par->screen.size);
memcpy_toio(par->cursor.k_addr, par->store_cursor, par->cursor.size);
vfree(par->store_fb);
vfree(par->store_cursor);
}
/* suspend and resume support */
static int sm501fb_suspend(struct platform_device *pdev, pm_message_t state)
{
struct sm501fb_info *info = platform_get_drvdata(pdev);
sm501fb_suspend_fb(info, HEAD_CRT);
sm501fb_suspend_fb(info, HEAD_PANEL);
/* turn off the clocks, in case the device is not powered down */
sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 0);
return 0;
}
static int sm501fb_resume(struct platform_device *pdev)
{
struct sm501fb_info *info = platform_get_drvdata(pdev);
sm501_unit_power(info->dev->parent, SM501_GATE_DISPLAY, 1);
sm501fb_resume_fb(info, HEAD_CRT);
sm501fb_resume_fb(info, HEAD_PANEL);
return 0;
}
#else
#define sm501fb_suspend NULL
#define sm501fb_resume NULL
#endif
static struct platform_driver sm501fb_driver = {
.probe = sm501fb_probe,
.remove = sm501fb_remove,
.suspend = sm501fb_suspend,
.resume = sm501fb_resume,
.driver = {
.name = "sm501-fb",
.owner = THIS_MODULE,
},
};
static int __devinit sm501fb_init(void)
{
return platform_driver_register(&sm501fb_driver);
}
static void __exit sm501fb_cleanup(void)
{
platform_driver_unregister(&sm501fb_driver);
}
module_init(sm501fb_init);
module_exit(sm501fb_cleanup);
MODULE_AUTHOR("Ben Dooks, Vincent Sanders");
MODULE_DESCRIPTION("SM501 Framebuffer driver");
MODULE_LICENSE("GPL v2");
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