android_kernel_xiaomi_sm8350/drivers/video/pmagb-b-fb.c
Krzysztof Helt 2f390380ca fbdev: add palette register check to several drivers
Add check if palette register number is in correct range for few drivers
which miss it.  The regno value comes indirectly from user space.

Two drivers has converted check from BUG_ON() macro to just return an
error (non-zero value).

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-16 07:20:01 -08:00

416 lines
10 KiB
C

/*
* linux/drivers/video/pmagb-b-fb.c
*
* PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support,
* derived from:
* "HP300 Topcat framebuffer support (derived from macfb of all things)
* Phil Blundell <philb@gnu.org> 1998", the original code can be
* found in the file hpfb.c in the same directory.
*
* DECstation related code Copyright (C) 1999, 2000, 2001 by
* Michael Engel <engel@unix-ag.org>,
* Karsten Merker <merker@linuxtag.org> and
* Harald Koerfgen.
* Copyright (c) 2005, 2006 Maciej W. Rozycki
*
* 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.
*/
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/tc.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/system.h>
#include <video/pmagb-b-fb.h>
struct pmagbbfb_par {
volatile void __iomem *mmio;
volatile void __iomem *smem;
volatile u32 __iomem *sfb;
volatile u32 __iomem *dac;
unsigned int osc0;
unsigned int osc1;
int slot;
};
static struct fb_var_screeninfo pmagbbfb_defined __initdata = {
.bits_per_pixel = 8,
.red.length = 8,
.green.length = 8,
.blue.length = 8,
.activate = FB_ACTIVATE_NOW,
.height = -1,
.width = -1,
.accel_flags = FB_ACCEL_NONE,
.sync = FB_SYNC_ON_GREEN,
.vmode = FB_VMODE_NONINTERLACED,
};
static struct fb_fix_screeninfo pmagbbfb_fix __initdata = {
.id = "PMAGB-BA",
.smem_len = (2048 * 1024),
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_PSEUDOCOLOR,
.mmio_len = PMAGB_B_FBMEM,
};
static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v)
{
writel(v, par->sfb + reg / 4);
}
static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg)
{
return readl(par->sfb + reg / 4);
}
static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v)
{
writeb(v, par->dac + reg / 4);
}
static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg)
{
return readb(par->dac + reg / 4);
}
static inline void gp0_write(struct pmagbbfb_par *par, u32 v)
{
writel(v, par->mmio + PMAGB_B_GP0);
}
/*
* Set the palette.
*/
static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
struct pmagbbfb_par *par = info->par;
if (regno >= info->cmap.len)
return 1;
red >>= 8; /* The cmap fields are 16 bits */
green >>= 8; /* wide, but the hardware colormap */
blue >>= 8; /* registers are only 8 bits wide */
mb();
dac_write(par, BT459_ADDR_LO, regno);
dac_write(par, BT459_ADDR_HI, 0x00);
wmb();
dac_write(par, BT459_CMAP, red);
wmb();
dac_write(par, BT459_CMAP, green);
wmb();
dac_write(par, BT459_CMAP, blue);
return 0;
}
static struct fb_ops pmagbbfb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = pmagbbfb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
/*
* Turn the hardware cursor off.
*/
static void __init pmagbbfb_erase_cursor(struct fb_info *info)
{
struct pmagbbfb_par *par = info->par;
mb();
dac_write(par, BT459_ADDR_LO, 0x00);
dac_write(par, BT459_ADDR_HI, 0x03);
wmb();
dac_write(par, BT459_DATA, 0x00);
}
/*
* Set up screen parameters.
*/
static void __init pmagbbfb_screen_setup(struct fb_info *info)
{
struct pmagbbfb_par *par = info->par;
info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >>
SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4;
info->var.xres_virtual = info->var.xres;
info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >>
SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK;
info->var.yres_virtual = info->var.yres;
info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
SFB_VID_HOR_BP_SHIFT) &
SFB_VID_HOR_BP_MASK) * 4;
info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >>
SFB_VID_HOR_FP_SHIFT) &
SFB_VID_HOR_FP_MASK) * 4;
info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >>
SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK;
info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >>
SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK;
info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >>
SFB_VID_HOR_SYN_SHIFT) &
SFB_VID_HOR_SYN_MASK) * 4;
info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >>
SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK;
info->fix.line_length = info->var.xres;
};
/*
* Determine oscillator configuration.
*/
static void __init pmagbbfb_osc_setup(struct fb_info *info)
{
static unsigned int pmagbbfb_freqs[] __initdata = {
130808, 119843, 104000, 92980, 74370, 72800,
69197, 66000, 65000, 50350, 36000, 32000, 25175
};
struct pmagbbfb_par *par = info->par;
struct tc_bus *tbus = to_tc_dev(info->device)->bus;
u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8;
u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250;
int i, j;
gp0_write(par, 0); /* select Osc0 */
for (j = 0; j < 16; j++) {
mb();
sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
mb();
for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
break;
udelay(1);
}
count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
}
gp0_write(par, 1); /* select Osc1 */
for (j = 0; j < 16; j++) {
mb();
sfb_write(par, SFB_REG_TCCLK_COUNT, 0);
for (i = 0; i < 100; i++) { /* nominally max. 20.5us */
if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0)
break;
udelay(1);
}
count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT);
}
freq0 = (freqtc * count0 + counttc / 2) / counttc;
par->osc0 = freq0;
if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 &&
freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64)
par->osc0 = pmagbbfb_freqs[0];
freq1 = (par->osc0 * count1 + count0 / 2) / count0;
par->osc1 = freq1;
for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++)
if (freq1 >= pmagbbfb_freqs[i] -
(pmagbbfb_freqs[i] + 128) / 256 &&
freq1 <= pmagbbfb_freqs[i] +
(pmagbbfb_freqs[i] + 128) / 256) {
par->osc1 = pmagbbfb_freqs[i];
break;
}
if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 ||
par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512)
par->osc1 = 0;
gp0_write(par, par->osc1 != 0); /* reselect OscX */
info->var.pixclock = par->osc1 ?
(1000000000 + par->osc1 / 2) / par->osc1 :
(1000000000 + par->osc0 / 2) / par->osc0;
};
static int __init pmagbbfb_probe(struct device *dev)
{
struct tc_dev *tdev = to_tc_dev(dev);
resource_size_t start, len;
struct fb_info *info;
struct pmagbbfb_par *par;
char freq0[12], freq1[12];
u32 vid_base;
int err;
info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev);
if (!info) {
printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
return -ENOMEM;
}
par = info->par;
dev_set_drvdata(dev, info);
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
printk(KERN_ERR "%s: Cannot allocate color map\n",
dev_name(dev));
err = -ENOMEM;
goto err_alloc;
}
info->fbops = &pmagbbfb_ops;
info->fix = pmagbbfb_fix;
info->var = pmagbbfb_defined;
info->flags = FBINFO_DEFAULT;
/* Request the I/O MEM resource. */
start = tdev->resource.start;
len = tdev->resource.end - start + 1;
if (!request_mem_region(start, len, dev_name(dev))) {
printk(KERN_ERR "%s: Cannot reserve FB region\n",
dev_name(dev));
err = -EBUSY;
goto err_cmap;
}
/* MMIO mapping setup. */
info->fix.mmio_start = start;
par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
if (!par->mmio) {
printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
err = -ENOMEM;
goto err_resource;
}
par->sfb = par->mmio + PMAGB_B_SFB;
par->dac = par->mmio + PMAGB_B_BT459;
/* Frame buffer mapping setup. */
info->fix.smem_start = start + PMAGB_B_FBMEM;
par->smem = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
if (!par->smem) {
printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
err = -ENOMEM;
goto err_mmio_map;
}
vid_base = sfb_read(par, SFB_REG_VID_BASE);
info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000;
info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000;
pmagbbfb_erase_cursor(info);
pmagbbfb_screen_setup(info);
pmagbbfb_osc_setup(info);
err = register_framebuffer(info);
if (err < 0) {
printk(KERN_ERR "%s: Cannot register framebuffer\n",
dev_name(dev));
goto err_smem_map;
}
get_device(dev);
snprintf(freq0, sizeof(freq0), "%u.%03uMHz",
par->osc0 / 1000, par->osc0 % 1000);
snprintf(freq1, sizeof(freq1), "%u.%03uMHz",
par->osc1 / 1000, par->osc1 % 1000);
pr_info("fb%d: %s frame buffer device at %s\n",
info->node, info->fix.id, dev_name(dev));
pr_info("fb%d: Osc0: %s, Osc1: %s, Osc%u selected\n",
info->node, freq0, par->osc1 ? freq1 : "disabled",
par->osc1 != 0);
return 0;
err_smem_map:
iounmap(par->smem);
err_mmio_map:
iounmap(par->mmio);
err_resource:
release_mem_region(start, len);
err_cmap:
fb_dealloc_cmap(&info->cmap);
err_alloc:
framebuffer_release(info);
return err;
}
static int __exit pmagbbfb_remove(struct device *dev)
{
struct tc_dev *tdev = to_tc_dev(dev);
struct fb_info *info = dev_get_drvdata(dev);
struct pmagbbfb_par *par = info->par;
resource_size_t start, len;
put_device(dev);
unregister_framebuffer(info);
iounmap(par->smem);
iounmap(par->mmio);
start = tdev->resource.start;
len = tdev->resource.end - start + 1;
release_mem_region(start, len);
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
return 0;
}
/*
* Initialize the framebuffer.
*/
static const struct tc_device_id pmagbbfb_tc_table[] = {
{ "DEC ", "PMAGB-BA" },
{ }
};
MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table);
static struct tc_driver pmagbbfb_driver = {
.id_table = pmagbbfb_tc_table,
.driver = {
.name = "pmagbbfb",
.bus = &tc_bus_type,
.probe = pmagbbfb_probe,
.remove = __exit_p(pmagbbfb_remove),
},
};
static int __init pmagbbfb_init(void)
{
#ifndef MODULE
if (fb_get_options("pmagbbfb", NULL))
return -ENXIO;
#endif
return tc_register_driver(&pmagbbfb_driver);
}
static void __exit pmagbbfb_exit(void)
{
tc_unregister_driver(&pmagbbfb_driver);
}
module_init(pmagbbfb_init);
module_exit(pmagbbfb_exit);
MODULE_LICENSE("GPL");