path: root/drivers/video/fbdev/nvidia/nvidia.c

/*
 * linux/drivers/video/nvidia/nvidia.c - nVidia fb driver
 *
 * Copyright 2004 Antonino Daplas <adaplas@pol.net>
 *
 * 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/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/console.h>
#include <linux/backlight.h>
#include <linux/string_choices.h>
#ifdef CONFIG_BOOTX_TEXT
#include <asm/btext.h>
#endif

#include "nv_local.h"
#include "nv_type.h"
#include "nv_proto.h"
#include "nv_dma.h"

#ifdef CONFIG_FB_NVIDIA_DEBUG
#define NVTRACE          printk
#else
#define NVTRACE          if (0) printk
#endif

#define NVTRACE_ENTER(...)  NVTRACE("%s START\n", __func__)
#define NVTRACE_LEAVE(...)  NVTRACE("%s END\n", __func__)

#ifdef CONFIG_FB_NVIDIA_DEBUG
#define assert(expr) \
	if (!(expr)) { \
	printk( "Assertion failed! %s,%s,%s,line=%d\n",\
	#expr,__FILE__,__func__,__LINE__); \
	BUG(); \
	}
#else
#define assert(expr)
#endif

#define PFX "nvidiafb: "

/* HW cursor parameters */
#define MAX_CURS		32

static const struct pci_device_id nvidiafb_pci_tbl[] = {
	{PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
	 PCI_BASE_CLASS_DISPLAY << 16, 0xff0000, 0},
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, nvidiafb_pci_tbl);

/* command line data, set in nvidiafb_setup() */
static int flatpanel = -1;	/* Autodetect later */
static int fpdither = -1;
static int forceCRTC = -1;
static int hwcur = 0;
static int noaccel = 0;
static int noscale = 0;
static int paneltweak = 0;
static int vram = 0;
static int bpp = 8;
static int reverse_i2c;
static bool nomtrr = false;
static int backlight = IS_BUILTIN(CONFIG_PMAC_BACKLIGHT);

static char *mode_option = NULL;

static struct fb_fix_screeninfo nvidiafb_fix = {
	.type = FB_TYPE_PACKED_PIXELS,
	.xpanstep = 8,
	.ypanstep = 1,
};

static struct fb_var_screeninfo nvidiafb_default_var = {
	.xres = 640,
	.yres = 480,
	.xres_virtual = 640,
	.yres_virtual = 480,
	.bits_per_pixel = 8,
	.red = {0, 8, 0},
	.green = {0, 8, 0},
	.blue = {0, 8, 0},
	.transp = {0, 0, 0},
	.activate = FB_ACTIVATE_NOW,
	.height = -1,
	.width = -1,
	.pixclock = 39721,
	.left_margin = 40,
	.right_margin = 24,
	.upper_margin = 32,
	.lower_margin = 11,
	.hsync_len = 96,
	.vsync_len = 2,
	.vmode = FB_VMODE_NONINTERLACED
};

static void nvidiafb_load_cursor_image(struct nvidia_par *par, u8 * data8,
				       u16 bg, u16 fg, u32 w, u32 h)
{
	u32 *data = (u32 *) data8;
	int i, j, k = 0;
	u32 b, tmp;

	w = (w + 1) & ~1;

	for (i = 0; i < h; i++) {
		b = *data++;
		reverse_order(&b);

		for (j = 0; j < w / 2; j++) {
			tmp = 0;
#if defined (__BIG_ENDIAN)
			tmp = (b & (1 << 31)) ? fg << 16 : bg << 16;
			b <<= 1;
			tmp |= (b & (1 << 31)) ? fg : bg;
			b <<= 1;
#else
			tmp = (b & 1) ? fg : bg;
			b >>= 1;
			tmp |= (b & 1) ? fg << 16 : bg << 16;
			b >>= 1;
#endif
			NV_WR32(&par->CURSOR[k++], 0, tmp);
		}
		k += (MAX_CURS - w) / 2;
	}
}

static void nvidia_write_clut(struct nvidia_par *par,
			      u8 regnum, u8 red, u8 green, u8 blue)
{
	NVWriteDacMask(par, 0xff);
	NVWriteDacWriteAddr(par, regnum);
	NVWriteDacData(par, red);
	NVWriteDacData(par, green);
	NVWriteDacData(par, blue);
}

static void nvidia_read_clut(struct nvidia_par *par,
			     u8 regnum, u8 * red, u8 * green, u8 * blue)
{
	NVWriteDacMask(par, 0xff);
	NVWriteDacReadAddr(par, regnum);
	*red = NVReadDacData(par);
	*green = NVReadDacData(par);
	*blue = NVReadDacData(par);
}

static int nvidia_panel_tweak(struct nvidia_par *par,
			      struct _riva_hw_state *state)
{
	int tweak = 0;

	if (par->paneltweak) {
		tweak = par->paneltweak;
	} else {
		/* Begin flat panel hacks.
		 * This is unfortunate, but some chips need this register
		 * tweaked or else you get artifacts where adjacent pixels are
		 * swapped.  There are no hard rules for what to set here so all
		 * we can do is experiment and apply hacks.
		 */
		if (((par->Chipset & 0xffff) == 0x0328) && (state->bpp == 32)) {
			/* At least one NV34 laptop needs this workaround. */
			tweak = -1;
		}

		if ((par->Chipset & 0xfff0) == 0x0310)
			tweak = 1;
		/* end flat panel hacks */
	}

	return tweak;
}

static void nvidia_screen_off(struct nvidia_par *par, int on)
{
	unsigned char tmp;

	if (on) {
		/*
		 * Turn off screen and disable sequencer.
		 */
		tmp = NVReadSeq(par, 0x01);

		NVWriteSeq(par