atyfb.c

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/*  $Id: atyfb.c,v 1.147 2000/08/29 07:01:56 davem Exp $
 *  linux/drivers/video/atyfb.c -- Frame buffer device for ATI Mach64
 *
 *	Copyright (C) 1997-1998  Geert Uytterhoeven
 *	Copyright (C) 1998  Bernd Harries
 *	Copyright (C) 1998  Eddie C. Dost  ([e-mail])
 *
 *  This driver is partly based on the PowerMac console driver:
 *
 *	Copyright (C) 1996 Paul Mackerras
 *
 *  and on the PowerMac ATI/mach64 display driver:
 *
 *	Copyright (C) 1997 Michael AK Tesch
 *
 *	      with work by Jon Howell
 *			   Harry AC Eaton
 *			   Anthony Tong <[e-mail]>
 *
 *  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.
 *  
 *  Many thanks to Nitya from ATI devrel for support and patience !
 */

/******************************************************************************

  TODO:

    - cursor support on all cards and all ramdacs.
    - cursor parameters controlable via ioctl()s.
    - guess PLL and MCLK based on the original PLL register values initialized
      by the BIOS or Open Firmware (if they are initialized).

						(Anyone to help with this?)

******************************************************************************/


#include <linux/config.h>
#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/malloc.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/selection.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/kd.h>
#include <linux/vt_kern.h>

#ifdef CONFIG_FB_COMPAT_XPMAC
#include <asm/vc_ioctl.h>
#endif

#include <asm/io.h>

#ifdef __powerpc__
#include <linux/adb.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <video/macmodes.h>
#endif
#ifdef CONFIG_ADB_PMU
#include <linux/pmu.h>
#endif
#ifdef CONFIG_NVRAM
#include <linux/nvram.h>
#endif
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif

#ifdef __sparc__
#include <asm/pbm.h>
#include <asm/fbio.h>
#endif
#include <asm/uaccess.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>
#include <video/fbcon-cfb24.h>
#include <video/fbcon-cfb32.h>

#include "aty.h"


/*
 * Debug flags.
 */
#undef DEBUG

/* Definitions for the ICS 2595 == ATI 18818_1 Clockchip */

#define REF_FREQ_2595       1432  /*  14.33 MHz  (exact   14.31818) */
#define REF_DIV_2595          46  /* really 43 on ICS 2595 !!!  */
                                  /* ohne Prescaler */
#define MAX_FREQ_2595      15938  /* 159.38 MHz  (really 170.486) */
#define MIN_FREQ_2595       8000  /*  80.00 MHz  (        85.565) */
                                  /* mit Prescaler 2, 4, 8 */
#define ABS_MIN_FREQ_2595   1000  /*  10.00 MHz  (really  10.697) */
#define N_ADJ_2595           257

#define STOP_BITS_2595     0x1800


#define MIN_N_408		2

#define MIN_N_1703		6

#define MIN_M		2
#define MAX_M		30
#define MIN_N		35
#define MAX_N		255-8


/* Make sure n * PAGE_SIZE is protected at end of Aperture for GUI-regs */
/*  - must be large enough to catch all GUI-Regs   */
/*  - must be aligned to a PAGE boundary           */
#define GUI_RESERVE	(1 * PAGE_SIZE)


/* FIXME: remove the FAIL definition */
#define FAIL(x) do { printk(x "\n"); return -EINVAL; } while (0)


    /*
     *  Elements of the Hardware specific atyfb_par structure
     */

struct crtc {
    u32 vxres;
    u32 vyres;
    u32 xoffset;
    u32 yoffset;
    u32 bpp;
    u32 h_tot_disp;
    u32 h_sync_strt_wid;
    u32 v_tot_disp;
    u32 v_sync_strt_wid;
    u32 off_pitch;
    u32 gen_cntl;
    u32 dp_pix_width;	/* acceleration */
    u32 dp_chain_mask;	/* acceleration */
};

struct pll_gx {
    u8 m;
    u8 n;
};

struct pll_18818
{
    u32 program_bits;
    u32 locationAddr;
    u32 period_in_ps;
    u32 post_divider;
};

struct pll_ct {
    u8 pll_ref_div;
    u8 pll_gen_cntl;
    u8 mclk_fb_div;
    u8 pll_vclk_cntl;
    u8 vclk_post_div;
    u8 vclk_fb_div;
    u8 pll_ext_cntl;
    u32 dsp_config;	/* Mach64 GTB DSP */
    u32 dsp_on_off;	/* Mach64 GTB DSP */
    u8 mclk_post_div_real;
    u8 vclk_post_div_real;
};


    /*
     *  The Hardware parameters for each card
     */

struct atyfb_par {
    struct crtc crtc;
    union {
	struct pll_gx gx;
	struct pll_ct ct;
	struct pll_18818 ics2595;
    } pll;
    u32 accel_flags;
};

struct aty_cmap_regs {
    u8 windex;
    u8 lut;
    u8 mask;
    u8 rindex;
    u8 cntl;
};

struct pci_mmap_map {
    unsigned long voff;
    unsigned long poff;
    unsigned long size;
    unsigned long prot_flag;
    unsigned long prot_mask;
};

#define DEFAULT_CURSOR_BLINK_RATE	(20)
#define CURSOR_DRAW_DELAY		(2)

struct aty_cursor {
    int	enable;
    int on;
    int vbl_cnt;
    int blink_rate;
    u32 offset;
    struct {
        u16 x, y;
    } pos, hot, size;
    u32 color[2];
    u8 bits[8][64];
    u8 mask[8][64];
    u8 *ram;
    struct timer_list *timer;
};

struct fb_info_aty {
    struct fb_info fb_info;
    struct fb_info_aty *next;
    unsigned long ati_regbase_phys;
    unsigned long ati_regbase;
    unsigned long frame_buffer_phys;
    unsigned long frame_buffer;
    unsigned long clk_wr_offset;
    struct pci_mmap_map *mmap_map;
    struct aty_cursor *cursor;
    struct aty_cmap_regs *aty_cmap_regs;
    struct { u8 red, green, blue, pad; } palette[256];
    struct atyfb_par default_par;
    struct atyfb_par current_par;
    u32 total_vram;
    u32 ref_clk_per;
    u32 pll_per;
    u32 mclk_per;
    u16 chip_type;
#define Gx info->chip_type
    u8 chip_rev;
#define Rev info->chip_rev
    u8 bus_type;
    u8 ram_type;
    u8 dac_type;
    u8 dac_subtype;
    u8 clk_type;
    u8 mem_refresh_rate;
    struct display disp;
    struct display_switch dispsw;
    union {
#ifdef FBCON_HAS_CFB16
	u16 cfb16[16];
#endif
#ifdef FBCON_HAS_CFB24
	u32 cfb24[16];
#endif
#ifdef FBCON_HAS_CFB32
	u32 cfb32[16];
#endif
    } fbcon_cmap;
    u8 blitter_may_be_busy;
#ifdef __sparc__
    u8 mmaped;
    int open;
    int vtconsole;
    int consolecnt;
#endif
#ifdef CONFIG_PMAC_PBOOK
    unsigned char *save_framebuffer;
    unsigned long save_pll[64];
#endif
};

#ifdef CONFIG_PMAC_PBOOK
  int aty_sleep_notify(struct pmu_sleep_notifier *self, int when);
  static struct pmu_sleep_notifier aty_sleep_notifier = {
  	aty_sleep_notify, SLEEP_LEVEL_VIDEO,
  };
  static struct fb_info_aty* first_display = NULL;
#endif

#ifdef CONFIG_PMAC_BACKLIGHT
static int aty_set_backlight_enable(int on, int level, void* data);
static int aty_set_backlight_level(int level, void* data);

static struct backlight_controller aty_backlight_controller = {
	aty_set_backlight_enable,
	aty_set_backlight_level
};
#endif /* CONFIG_PMAC_BACKLIGHT */

    /*
     *  Frame buffer device API
     */

static int atyfb_open(struct fb_info *info, int user);
static int atyfb_release(struct fb_info *info, int user);
static int atyfb_get_fix(struct fb_fix_screeninfo *fix, int con,
			 struct fb_info *fb);
static int atyfb_get_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *fb);
static int atyfb_set_var(struct fb_var_screeninfo *var, int con,
			 struct fb_info *fb);
static int atyfb_pan_display(struct fb_var_screeninfo *var, int con,
			     struct fb_info *fb);
static int atyfb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static int atyfb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static int atyfb_ioctl(struct inode *inode, struct file *file, u_int cmd,
		       u_long arg, int con, struct fb_info *info);
#ifdef __sparc__
static int atyfb_mmap(struct fb_info *info, struct file *file,
		      struct vm_area_struct *vma);
#endif
static int atyfb_rasterimg(struct fb_info *info, int start);


    /*
     *  Interface to the low level console driver
     */

static int atyfbcon_switch(int con, struct fb_info *fb);
static int atyfbcon_updatevar(int con, struct fb_info *fb);
static void atyfbcon_blank(int blank, struct fb_info *fb);


    /*
     *  Text console acceleration
     */

static void fbcon_aty_bmove(struct display *p, int sy, int sx, int dy, int dx,
			    int height, int width);
static void fbcon_aty_clear(struct vc_data *conp, struct display *p, int sy,
			    int sx, int height, int width);
#ifdef FBCON_HAS_CFB8
static struct display_switch fbcon_aty8;
static void fbcon_aty8_putc(struct vc_data *conp, struct display *p, int c,
			    int yy, int xx);
static void fbcon_aty8_putcs(struct vc_data *conp, struct display *p,
			     const unsigned short *s, int count, int yy,
			     int xx);
#endif
#ifdef FBCON_HAS_CFB16
static struct display_switch fbcon_aty16;
static void fbcon_aty16_putc(struct vc_data *conp, struct display *p, int c,
			     int yy, int xx);
static void fbcon_aty16_putcs(struct vc_data *conp, struct display *p,
			      const unsigned short *s, int count, int yy,
			      int xx);
#endif
#ifdef FBCON_HAS_CFB24
static struct display_switch fbcon_aty24;
static void fbcon_aty24_putc(struct vc_data *conp, struct display *p, int c,
			     int yy, int xx);
static void fbcon_aty24_putcs(struct vc_data *conp, struct display *p,
			      const unsigned short *s, int count, int yy,
			      int xx);
#endif
#ifdef FBCON_HAS_CFB32
static struct display_switch fbcon_aty32;
static void fbcon_aty32_putc(struct vc_data *conp, struct display *p, int c,
			     int yy, int xx);
static void fbcon_aty32_putcs(struct vc_data *conp, struct display *p,
			      const unsigned short *s, int count, int yy,
			      int xx);
#endif


    /*
     *  Internal routines
     */

static int aty_init(struct fb_info_aty *info, const char *name);
static struct aty_cursor *aty_init_cursor(struct fb_info_aty *fb);
#ifdef CONFIG_ATARI
static int store_video_par(char *videopar, unsigned char m64_num);
static char *strtoke(char *s, const char *ct);
#endif

static void reset_engine(const struct fb_info_aty *info);
static void init_engine(const struct atyfb_par *par, struct fb_info_aty *info);

static void aty_st_514(int offset, u8 val, const struct fb_info_aty *info);
static void aty_st_pll(int offset, u8 val, const struct fb_info_aty *info);
static u8 aty_ld_pll(int offset, const struct fb_info_aty *info);
static void aty_set_crtc(const struct fb_info_aty *info,
			 const struct crtc *crtc);
static int aty_var_to_crtc(const struct fb_info_aty *info,
			   const struct fb_var_screeninfo *var,
			   struct crtc *crtc);
static void aty_set_dac_514(const struct fb_info_aty *info, u32 bpp);
static int aty_crtc_to_var(const struct crtc *crtc,
			   struct fb_var_screeninfo *var);
static void aty_set_pll_gx(const struct fb_info_aty *info,
			   const struct pll_gx *pll);

static int aty_set_dac_ATI68860_B(const struct fb_info_aty *info, u32 bpp,
				  u32 AccelMode);
static int aty_set_dac_ATT21C498(const struct fb_info_aty *info,
				 const struct pll_18818 *pll, u32 bpp);
void aty_dac_waste4(const struct fb_info_aty *info);

static int aty_var_to_pll_18818(u32 period_in_ps, struct pll_18818 *pll);
static u32 aty_pll_18818_to_var(const struct pll_18818 *pll);
static void aty_set_pll18818(const struct fb_info_aty *info,
			     const struct pll_18818 *pll);

static void aty_StrobeClock(const struct fb_info_aty *info);

static void aty_ICS2595_put1bit(u8 data, const struct fb_info_aty *info);

static int aty_var_to_pll_408(u32 period_in_ps, struct pll_18818 *pll);
static u32 aty_pll_408_to_var(const struct pll_18818 *pll);
static void aty_set_pll_408(const struct fb_info_aty *info,
			    const struct pll_18818 *pll);

static int aty_var_to_pll_1703(u32 period_in_ps, struct pll_18818 *pll);
static u32 aty_pll_1703_to_var(const struct pll_18818 *pll);
static void aty_set_pll_1703(const struct fb_info_aty *info,
			     const struct pll_18818 *pll);

static int aty_var_to_pll_8398(u32 period_in_ps, struct pll_18818 *pll);
static u32 aty_pll_8398_to_var(const struct pll_18818 *pll);
static void aty_set_pll_8398(const struct fb_info_aty *info,
			     const struct pll_18818 *pll);

static int aty_var_to_pll_514(u32 vclk_per, struct pll_gx *pll);
static u32 aty_pll_gx_to_var(const struct pll_gx *pll,
			     const struct fb_info_aty *info);
static void aty_set_pll_ct(const struct fb_info_aty *info,
			   const struct pll_ct *pll);
static int aty_valid_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
			    struct pll_ct *pll);
static int aty_dsp_gt(const struct fb_info_aty *info, u8 bpp,
		      struct pll_ct *pll);
static void aty_calc_pll_ct(const struct fb_info_aty *info,
			    struct pll_ct *pll);
static int aty_var_to_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
			     u8 bpp, struct pll_ct *pll);
static u32 aty_pll_ct_to_var(const struct pll_ct *pll,
			     const struct fb_info_aty *info);
static void atyfb_set_par(const struct atyfb_par *par,
			  struct fb_info_aty *info);
static int atyfb_decode_var(const struct fb_var_screeninfo *var,
			    struct atyfb_par *par,
			    const struct fb_info_aty *info);
static int atyfb_encode_var(struct fb_var_screeninfo *var,
			    const struct atyfb_par *par,
			    const struct fb_info_aty *info);
static void set_off_pitch(struct atyfb_par *par,
			  const struct fb_info_aty *info);
static int encode_fix(struct fb_fix_screeninfo *fix,
		      const struct atyfb_par *par,
		      const struct fb_info_aty *info);
static void atyfb_set_dispsw(struct display *disp, struct fb_info_aty *info,
			     int bpp, int accel);
static int atyfb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
			 u_int *transp, struct fb_info *fb);
static int atyfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			 u_int transp, struct fb_info *fb);
static void do_install_cmap(int con, struct fb_info *info);
#ifdef CONFIG_PPC
static int read_aty_sense(const struct fb_info_aty *info);
#endif


    /*
     *  Interface used by the world
     */

int atyfb_init(void);
#ifndef MODULE
int atyfb_setup(char*);
#endif