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/*
* Frame buffer driver for the Carmine GPU.
*
* The driver configures the GPU as follows
* - FB0 is display 0 with unique memory area
* - FB1 is display 1 with unique memory area
* - both display use 32 bit colors
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "carminefb.h"
#include "carminefb_regs.h"
#if !defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN)
#error "The endianness of the target host has not been defined."
#endif
/*
* The initial video mode can be supplied via two different ways:
* - as a string that is passed to fb_find_mode() (module option fb_mode_str)
* - as an integer that picks the video mode from carmine_modedb[] (module
* option fb_mode)
*
* If nothing is used than the initial video mode will be the
* CARMINEFB_DEFAULT_VIDEO_MODE member of the carmine_modedb[].
*/
#define CARMINEFB_DEFAULT_VIDEO_MODE 1
static unsigned int fb_mode = CARMINEFB_DEFAULT_VIDEO_MODE;
module_param(fb_mode, uint, 0444);
MODULE_PARM_DESC(fb_mode, "Initial video mode as integer.");
static char *fb_mode_str;
module_param(fb_mode_str, charp, 0444);
MODULE_PARM_DESC(fb_mode_str, "Initial video mode in characters.");
/*
* Carminefb displays:
* 0b000 None
* 0b001 Display 0
* 0b010 Display 1
*/
static int fb_displays = CARMINE_USE_DISPLAY0 | CARMINE_USE_DISPLAY1;
module_param(fb_displays, int, 0444);
MODULE_PARM_DESC(fb_displays, "Bit mode, which displays are used");
struct carmine_hw {
void __iomem *v_regs;
void __iomem *screen_mem;
struct fb_info *fb[MAX_DISPLAY];
};
struct carmine_resolution {
u32 htp;
u32 hsp;
u32 hsw;
u32 hdp;
u32 vtr;
u32 vsp;
u32 vsw;
u32 vdp;
u32 disp_mode;
};
struct carmine_fb {
void __iomem *display_reg;
void __iomem *screen_base;
u32 smem_offset;
u32 cur_mode;
u32 new_mode;
struct carmine_resolution *res;
u32 pseudo_palette[16];
};
static struct fb_fix_screeninfo carminefb_fix = {
.id = "Carmine",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_TRUECOLOR,
.accel = FB_ACCEL_NONE,
};
static const struct fb_videomode carmine_modedb[] = {
{
.name = "640x480",
.xres = 640,
.yres = 480,
}, {
.name = "800x600",
.xres = 800,
.yres = 600,
},
};
static struct carmine_resolution car_modes[] = {
{
/* 640x480 */
.htp = 800,
.hsp = 672,
.hsw = 96,
.hdp = 640,
.vtr = 525,
.vsp = 490,
.vsw = 2,
.vdp = 480,
.disp_mode = 0x1400,
},
{
/* 800x600 */
.htp = 1060,
.hsp = 864,
.hsw = 72,
.hdp = 800,
.vtr = 628,
.vsp = 601,
.vsw = 2,
.vdp = 600,
.disp_mode = 0x0d00,
}
};
static int carmine_find_mode(const struct fb_var_screeninfo *var)
{
int i;
for (i = 0; i < ARRAY_SIZE(car_modes); i++)
if (car_modes[i].hdp == var->xres &&
car_modes[i].vdp == var->yres)
return i;
return -EINVAL;
}
static void c_set_disp_reg(const struct carmine_fb *par,
u32 offset, u32 val)
{
writel(val, par->display_reg + offset);
}
static u32 c_get_disp_reg(const struct carmine_fb *par,
u32 offset)
{
return readl(par->display_reg + offset);
}
static void c_set_hw_reg(const struct carmine_hw *hw,
u32 offset, u32 val)
{
writel(val, hw->v_regs + offset);
}
static u32 c_get_hw_reg(const struct carmine_hw *hw,
u32 offset)
{
return readl(hw->v_regs + offset);
}
static int carmine_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info)
{
if (regno >= 16)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
transp >>= 8;
((__be32 *)info->pseudo_palette)[regno] = cpu_to_be32(transp << 24 |
red << 0 | green << 8 | blue << 16);
return 0;
}
static int carmine_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
int ret;
ret = carmine_find_mode(var);
if (ret < 0)
return ret;
if (var->grayscale || var->rotate || var->nonstd)
return -EINVAL;
var->xres_virtual = var->xres;
var->yres_virtual = var->yres;
var->bits_per_pixel = 32;
#ifdef __BIG_ENDIAN
var->transp.offset = 24;
var->red.offset = 0;
var->green.offset = 8;
var->blue.offset = 16;
#else
var->transp.offset = 24;
var->
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