// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Geode GX framebuffer driver.
*
* Copyright (C) 2006 Arcom Control Systems Ltd.
*
* This driver assumes that the BIOS has created a virtual PCI device header
* for the video device. The PCI header is assumed to contain the following
* BARs:
*
* BAR0 - framebuffer memory
* BAR1 - graphics processor registers
* BAR2 - display controller registers
* BAR3 - video processor and flat panel control registers.
*
* 16 MiB of framebuffer memory is assumed to be available.
*/
#include <linux/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/console.h>
#include <linux/suspend.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/cs5535.h>
#include <asm /msr.h>
#include <asm /olpc.h>
#include "gxfb.h"
static char *mode_option;
static int vram;
static int vt_switch;
/* Modes relevant to the GX (taken from modedb.c) */
static struct fb_videomode gx_modedb[] = {
/* 640x480-60 VESA */
{ NULL, 60 , 640 , 480 , 39682 , 48 , 16 , 33 , 10 , 96 , 2 ,
0 , FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 640x480-75 VESA */
{ NULL, 75 , 640 , 480 , 31746 , 120 , 16 , 16 , 01 , 64 , 3 ,
0 , FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 640x480-85 VESA */
{ NULL, 85 , 640 , 480 , 27777 , 80 , 56 , 25 , 01 , 56 , 3 ,
0 , FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 800x600-60 VESA */
{ NULL, 60 , 800 , 600 , 25000 , 88 , 40 , 23 , 01 , 128 , 4 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 800x600-75 VESA */
{ NULL, 75 , 800 , 600 , 20202 , 160 , 16 , 21 , 01 , 80 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 800x600-85 VESA */
{ NULL, 85 , 800 , 600 , 17761 , 152 , 32 , 27 , 01 , 64 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1024x768-60 VESA */
{ NULL, 60 , 1024 , 768 , 15384 , 160 , 24 , 29 , 3 , 136 , 6 ,
0 , FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1024x768-75 VESA */
{ NULL, 75 , 1024 , 768 , 12690 , 176 , 16 , 28 , 1 , 96 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1024x768-85 VESA */
{ NULL, 85 , 1024 , 768 , 10582 , 208 , 48 , 36 , 1 , 96 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1280x960-60 VESA */
{ NULL, 60 , 1280 , 960 , 9259 , 312 , 96 , 36 , 1 , 112 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1280x960-85 VESA */
{ NULL, 85 , 1280 , 960 , 6734 , 224 , 64 , 47 , 1 , 160 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1280x1024-60 VESA */
{ NULL, 60 , 1280 , 1024 , 9259 , 248 , 48 , 38 , 1 , 112 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1280x1024-75 VESA */
{ NULL, 75 , 1280 , 1024 , 7407 , 248 , 16 , 38 , 1 , 144 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1280x1024-85 VESA */
{ NULL, 85 , 1280 , 1024 , 6349 , 224 , 64 , 44 , 1 , 160 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1600x1200-60 VESA */
{ NULL, 60 , 1600 , 1200 , 6172 , 304 , 64 , 46 , 1 , 192 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1600x1200-75 VESA */
{ NULL, 75 , 1600 , 1200 , 4938 , 304 , 64 , 46 , 1 , 192 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
/* 1600x1200-85 VESA */
{ NULL, 85 , 1600 , 1200 , 4357 , 304 , 64 , 46 , 1 , 192 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
};
static struct fb_videomode gx_dcon_modedb[] = {
/* The only mode the DCON has is 1200x900 */
{ NULL, 50 , 1200 , 900 , 17460 , 24 , 8 , 4 , 5 , 8 , 3 ,
FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
FB_VMODE_NONINTERLACED, 0 }
};
static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
{
if (olpc_has_dcon()) {
*modedb = (struct fb_videomode *) gx_dcon_modedb;
*size = ARRAY_SIZE(gx_dcon_modedb);
} else {
*modedb = (struct fb_videomode *) gx_modedb;
*size = ARRAY_SIZE(gx_modedb);
}
}
static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
if (var->xres > 1600 || var->yres > 1200 )
return -EINVAL;
if ((var->xres > 1280 || var->yres > 1024 ) && var->bits_per_pixel > 16 )
return -EINVAL;
if (var->bits_per_pixel == 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 ;
} else 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 ;
} else if (var->bits_per_pixel == 8 ) {
var->red.offset = 0 ; var->red.length = 8 ;
var->green.offset = 0 ; var->green.length = 8 ;
var->blue.offset = 0 ; var->blue.length = 8 ;
} else
return -EINVAL;
var->transp.offset = 0 ; var->transp.length = 0 ;
/* Enough video memory? */
if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
return -EINVAL;
/* FIXME: Check timing parameters here? */
return 0 ;
}
static int gxfb_set_par(struct fb_info *info)
{
if (info->var.bits_per_pixel > 8 )
info->fix.visual = FB_VISUAL_TRUECOLOR;
else
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
gx_set_mode(info);
return 0 ;
}
static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
chan &= 0 xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
if (info->var.grayscale) {
/* grayscale = 0.30*R + 0.59*G + 0.11*B */
red = green = blue = (red * 77 + green * 151 + blue * 28 ) >> 8 ;
}
/* Truecolor has hardware independent palette */
if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
u32 *pal = info->pseudo_palette;
u32 v;
if (regno >= 16 )
return -EINVAL;
v = chan_to_field(red, &info->var.red);
v |= chan_to_field(green, &info->var.green);
v |= chan_to_field(blue, &info->var.blue);
pal[regno] = v;
} else {
if (regno >= 256 )
return -EINVAL;
gx_set_hw_palette_reg(info, regno, red, green, blue);
}
return 0 ;
}
static int gxfb_blank(int blank_mode, struct fb_info *info)
{
return gx_blank_display(info, blank_mode);
}
static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
{
struct gxfb_par *par = info->par;
int ret;
ret = pci_enable_device(dev);
if (ret < 0 )
return ret;
ret = pci_request_region(dev, 3 , "gxfb (video processor)" );
if (ret < 0 )
return ret;
par->vid_regs = pci_ioremap_bar(dev, 3 );
if (!par->vid_regs)
return -ENOMEM;
ret = pci_request_region(dev, 2 , "gxfb (display controller)" );
if (ret < 0 )
return ret;
par->dc_regs = pci_ioremap_bar(dev, 2 );
if (!par->dc_regs)
return -ENOMEM;
ret = pci_request_region(dev, 1 , "gxfb (graphics processor)" );
if (ret < 0 )
return ret;
par->gp_regs = pci_ioremap_bar(dev, 1 );
if (!par->gp_regs)
return -ENOMEM;
ret = pci_request_region(dev, 0 , "gxfb (framebuffer)" );
if (ret < 0 )
return ret;
info->fix.smem_start = pci_resource_start(dev, 0 );
info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
info->screen_base = ioremap_wc(info->fix.smem_start,
info->fix.smem_len);
if (!info->screen_base)
return -ENOMEM;
/* Set the 16MiB aligned base address of the graphics memory region
* in the display controller */
write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0 xFF000000);
dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n" ,
info->fix.smem_len / 1024 , info->fix.smem_start);
return 0 ;
}
static const struct fb_ops gxfb_ops = {
.owner = THIS_MODULE,
FB_DEFAULT_IOMEM_OPS,
.fb_check_var = gxfb_check_var,
.fb_set_par = gxfb_set_par,
.fb_setcolreg = gxfb_setcolreg,
.fb_blank = gxfb_blank,
};
static struct fb_info *gxfb_init_fbinfo(struct device *dev)
{
struct gxfb_par *par;
struct fb_info *info;
/* Alloc enough space for the pseudo palette. */
info = framebuffer_alloc(sizeof (struct gxfb_par) + sizeof (u32) * 16 ,
dev);
if (!info)
return NULL;
par = info->par;
strcpy(info->fix.id, "Geode GX" );
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.type_aux = 0 ;
info->fix.xpanstep = 0 ;
info->fix.ypanstep = 0 ;
info->fix.ywrapstep = 0 ;
info->fix.accel = FB_ACCEL_NONE;
info->var.nonstd = 0 ;
info->var.activate = FB_ACTIVATE_NOW;
info->var.height = -1 ;
info->var.width = -1 ;
info->var.accel_flags = 0 ;
info->var.vmode = FB_VMODE_NONINTERLACED;
info->fbops = &gxfb_ops;
info->node = -1 ;
info->pseudo_palette = (void *)par + sizeof (struct gxfb_par);
info->var.grayscale = 0 ;
if (fb_alloc_cmap(&info->cmap, 256 , 0 ) < 0 ) {
framebuffer_release(info);
return NULL;
}
return info;
}
static int __maybe_unused gxfb_suspend(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
console_lock();
gx_powerdown(info);
fb_set_suspend(info, 1 );
console_unlock();
/* there's no point in setting PCI states; we emulate PCI, so
* we don't end up getting power savings anyways */
return 0 ;
}
static int __maybe_unused gxfb_resume(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
int ret;
console_lock();
ret = gx_powerup(info);
if (ret) {
printk(KERN_ERR "gxfb: power up failed!\n" );
return ret;
}
fb_set_suspend(info, 0 );
console_unlock();
return 0 ;
}
static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct gxfb_par *par;
struct fb_info *info;
int ret;
unsigned long val;
struct fb_videomode *modedb_ptr;
unsigned int modedb_size;
ret = aperture_remove_conflicting_pci_devices(pdev, "gxfb" );
if (ret)
return ret;
info = gxfb_init_fbinfo(&pdev->dev);
if (!info)
return -ENOMEM;
par = info->par;
if ((ret = gxfb_map_video_memory(info, pdev)) < 0 ) {
dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n" );
goto err;
}
/* Figure out if this is a TFT or CRT part */
rdmsrq(MSR_GX_GLD_MSR_CONFIG, val);
if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
par->enable_crt = 0 ;
else
par->enable_crt = 1 ;
get_modedb(&modedb_ptr, &modedb_size);
ret = fb_find_mode(&info->var, info, mode_option,
modedb_ptr, modedb_size, NULL, 16 );
if (ret == 0 || ret == 4 ) {
dev_err(&pdev->dev, "could not find valid video mode\n" );
ret = -EINVAL;
goto err;
}
/* Clear the frame buffer of garbage. */
memset_io(info->screen_base, 0 , info->fix.smem_len);
gxfb_check_var(&info->var, info);
gxfb_set_par(info);
pm_set_vt_switch(vt_switch);
if (register_framebuffer(info) < 0 ) {
ret = -EINVAL;
goto err;
}
pci_set_drvdata(pdev, info);
fb_info(info, "%s frame buffer device\n" , info->fix.id);
return 0 ;
err:
if (info->screen_base) {
iounmap(info->screen_base);
pci_release_region(pdev, 0 );
}
if (par->vid_regs) {
iounmap(par->vid_regs);
pci_release_region(pdev, 3 );
}
if (par->dc_regs) {
iounmap(par->dc_regs);
pci_release_region(pdev, 2 );
}
if (par->gp_regs) {
iounmap(par->gp_regs);
pci_release_region(pdev, 1 );
}
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
return ret;
}
static void gxfb_remove(struct pci_dev *pdev)
{
struct fb_info *info = pci_get_drvdata(pdev);
struct gxfb_par *par = info->par;
unregister_framebuffer(info);
iounmap((void __iomem *)info->screen_base);
pci_release_region(pdev, 0 );
iounmap(par->vid_regs);
pci_release_region(pdev, 3 );
iounmap(par->dc_regs);
pci_release_region(pdev, 2 );
iounmap(par->gp_regs);
pci_release_region(pdev, 1 );
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
}
static const struct pci_device_id gxfb_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
{ 0 , }
};
MODULE_DEVICE_TABLE(pci, gxfb_id_table);
static const struct dev_pm_ops gxfb_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.suspend = gxfb_suspend,
.resume = gxfb_resume,
.freeze = NULL,
.thaw = gxfb_resume,
.poweroff = NULL,
.restore = gxfb_resume,
#endif
};
static struct pci_driver gxfb_driver = {
.name = "gxfb" ,
.id_table = gxfb_id_table,
.probe = gxfb_probe,
.remove = gxfb_remove,
.driver.pm = &gxfb_pm_ops,
};
#ifndef MODULE
static int __init gxfb_setup(char *options)
{
char *opt;
if (!options || !*options)
return 0 ;
while ((opt = strsep(&options, "," )) != NULL) {
if (!*opt)
continue ;
mode_option = opt;
}
return 0 ;
}
#endif
static int __init gxfb_init(void )
{
#ifndef MODULE
char *option = NULL;
#endif
if (fb_modesetting_disabled("gxfb" ))
return -ENODEV;
#ifndef MODULE
if (fb_get_options("gxfb" , &option))
return -ENODEV;
gxfb_setup(option);
#endif
return pci_register_driver(&gxfb_driver);
}
static void __exit gxfb_cleanup(void )
{
pci_unregister_driver(&gxfb_driver);
}
module_init(gxfb_init);
module_exit(gxfb_cleanup);
module_param(mode_option, charp, 0 );
MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])" );
module_param(vram, int , 0 );
MODULE_PARM_DESC(vram, "video memory size" );
module_param(vt_switch, int , 0 );
MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume" );
MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX" );
MODULE_LICENSE("GPL" );
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