aty128fb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/* $Id: aty128fb.c,v 1.1.1.1.36.1 1999/12/11 09:03:05 Exp $
 *  linux/drivers/video/aty128fb.c -- Frame buffer device for ATI Rage128
 *
 *  Copyright (C) 1999-2000, Brad Douglas <[e-mail]>
 *  Copyright (C) 1999, Anthony Tong <[e-mail]>
 *
 *                Ani Joshi / Jeff Garzik
 *                      - Code cleanup
 *
 *                Michel D鋘zer <[e-mail]>
 *                      - 15/16 bit cleanup
 *                      - fix panning
 *                      
 *                Benjamin Herrenschmidt
 *                      - pmac-specific PM stuff
 *
 *                Andreas Hundt <[e-mail]>
 *                      - FB_ACTIVATE fixes
 *
 *  Based off of Geert's atyfb.c and vfb.c.
 *
 *  TODO:
 *		- monitor sensing (DDC)
 *              - virtual display
 *		- other platform support (only ppc/x86 supported)
 *		- hardware cursor support
 *		- ioctl()'s
 *
 *    Please cc: your patches to [e-mail].
 */

/*
 * A special note of gratitude to ATI's devrel for providing documentation,
 * example code and hardware. Thanks Nitya.	-atong and brad
 */


#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/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/selection.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/io.h>

#ifdef CONFIG_PPC
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <video/macmodes.h>
#ifdef CONFIG_NVRAM
#include <linux/nvram.h>
#endif
#endif

#ifdef CONFIG_ADB_PMU
#include <linux/adb.h>
#include <linux/pmu.h>
#endif

#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif

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

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

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

#include "aty128.h"

/* Debug flag */
#undef DEBUG

#ifdef DEBUG
#define DBG(fmt, args...)		printk(KERN_DEBUG "aty128fb: %s " fmt, __FUNCTION__, ##args);
#else
#define DBG(fmt, args...)
#endif

#ifndef CONFIG_PPC
/* default mode */
static struct fb_var_screeninfo default_var __initdata = {
    /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
    640, 480, 640, 480, 0, 0, 8, 0,
    {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
    0, 0, -1, -1, 0, 39722, 48, 16, 33, 10, 96, 2,
    0, FB_VMODE_NONINTERLACED
};

#else /* CONFIG_PPC */
/* default to 1024x768 at 75Hz on PPC - this will work
 * on the iMac, the usual 640x480 @ 60Hz doesn't. */
static struct fb_var_screeninfo default_var = {
    /* 1024x768, 75 Hz, Non-Interlaced (78.75 MHz dotclock) */
    1024, 768, 1024, 768, 0, 0, 8, 0,
    {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
    0, 0, -1, -1, 0, 12699, 160, 32, 28, 1, 96, 3,
    FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED
};
#endif /* CONFIG_PPC */

/* default modedb mode */
/* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
static struct fb_videomode defaultmode __initdata = {
	refresh:	60,
	xres:		640,
	yres:		480,
	pixclock:	39722,
	left_margin:	48,
	right_margin:	16,
	upper_margin:	33,
	lower_margin:	10,
	hsync_len:	96,
	vsync_len:	2,
	sync:		0,
	vmode:		FB_VMODE_NONINTERLACED
};

/* struct to hold chip description information */
struct aty128_chip_info {
    const char *name;
    unsigned short device;
    int chip_gen;
};

/* Chip generations */
enum {
	rage_128,
	rage_128_pro,
	rage_M3
};

/* supported Rage128 chipsets */
static struct aty128_chip_info aty128_pci_probe_list[] __initdata =
{
    {"Rage128 RE (PCI)", PCI_DEVICE_ID_ATI_RAGE128_RE, rage_128},
    {"Rage128 RF (AGP)", PCI_DEVICE_ID_ATI_RAGE128_RF, rage_128},
    {"Rage128 RK (PCI)", PCI_DEVICE_ID_ATI_RAGE128_RK, rage_128},
    {"Rage128 RL (AGP)", PCI_DEVICE_ID_ATI_RAGE128_RL, rage_128},
    {"Rage128 Pro PF (AGP)", PCI_DEVICE_ID_ATI_RAGE128_PF, rage_128_pro},
    {"Rage128 Pro PR (PCI)", PCI_DEVICE_ID_ATI_RAGE128_PR, rage_128_pro},
    {"Rage128 Pro TR (AGP)", PCI_DEVICE_ID_ATI_RAGE128_U3, rage_128_pro},
    {"Rage128 Pro TF (AGP)", PCI_DEVICE_ID_ATI_RAGE128_U1, rage_128_pro},
    {"Rage Mobility M3 (PCI)", PCI_DEVICE_ID_ATI_RAGE128_LE, rage_M3},
    {"Rage Mobility M3 (AGP)", PCI_DEVICE_ID_ATI_RAGE128_LF, rage_M3},
    {NULL, 0, rage_128}
 };

/* packed BIOS settings */
#ifndef CONFIG_PPC
typedef struct {
	u8 clock_chip_type;
	u8 struct_size;
	u8 accelerator_entry;
	u8 VGA_entry;
	u16 VGA_table_offset;
	u16 POST_table_offset;
	u16 XCLK;
	u16 MCLK;
	u8 num_PLL_blocks;
	u8 size_PLL_blocks;
	u16 PCLK_ref_freq;
	u16 PCLK_ref_divider;
	u32 PCLK_min_freq;
	u32 PCLK_max_freq;
	u16 MCLK_ref_freq;
	u16 MCLK_ref_divider;
	u32 MCLK_min_freq;
	u32 MCLK_max_freq;
	u16 XCLK_ref_freq;
	u16 XCLK_ref_divider;
	u32 XCLK_min_freq;
	u32 XCLK_max_freq;
} __attribute__ ((packed)) PLL_BLOCK;
#endif /* !CONFIG_PPC */

/* onboard memory information */
struct aty128_meminfo {
    u8 ML;
    u8 MB;
    u8 Trcd;
    u8 Trp;
    u8 Twr;
    u8 CL;
    u8 Tr2w;
    u8 LoopLatency;
    u8 DspOn;
    u8 Rloop;
    const char *name;
};

/* various memory configurations */
static const struct aty128_meminfo sdr_128   =
    { 4, 4, 3, 3, 1, 3, 1, 16, 30, 16, "128-bit SDR SGRAM (1:1)" };
static const struct aty128_meminfo sdr_64    =
    { 4, 8, 3, 3, 1, 3, 1, 17, 46, 17, "64-bit SDR SGRAM (1:1)" };
static const struct aty128_meminfo sdr_sgram =
    { 4, 4, 1, 2, 1, 2, 1, 16, 24, 16, "64-bit SDR SGRAM (2:1)" };
static const struct aty128_meminfo ddr_sgram =
    { 4, 4, 3, 3, 2, 3, 1, 16, 31, 16, "64-bit DDR SGRAM" };

static const char *aty128fb_name = "ATY Rage128";
static char fontname[40] __initdata = { 0 };

static int  noaccel __initdata = 0;
static char *font __initdata = NULL;
static char *mode __initdata = NULL;
static int  nomtrr __initdata = 0;

static char *mode_option __initdata = NULL;

#ifdef CONFIG_PPC
static int default_vmode __initdata = VMODE_1024_768_60;
static int default_cmode __initdata = CMODE_8;
#endif

#ifdef CONFIG_PMAC_PBOOK
static int default_crt_on __initdata = 0;
static int default_lcd_on __initdata = 1;
#endif

#ifdef CONFIG_MTRR
static int mtrr = 1;
#endif

/* PLL constants */
struct aty128_constants {
    u32 dotclock;
    u32 ppll_min;
    u32 ppll_max;
    u32 ref_divider;
    u32 xclk;
    u32 fifo_width;
    u32 fifo_depth;
};

struct aty128_crtc {
    u32 gen_cntl;
    u32 ext_cntl;
    u32 h_total, h_sync_strt_wid;
    u32 v_total, v_sync_strt_wid;
    u32 pitch;
    u32 offset, offset_cntl;
    u32 xoffset, yoffset;
    u32 vxres, vyres;
    u32 depth, bpp;
};

struct aty128_pll {
    u32 post_divider;
    u32 feedback_divider;
    u32 vclk;
};

struct aty128_ddafifo {
    u32 dda_config;
    u32 dda_on_off;
};

/* register values for a specific mode */
struct aty128fb_par {
    struct aty128_crtc crtc;
    struct aty128_pll pll;
    struct aty128_ddafifo fifo_reg;
    u32 accel_flags;
};

struct fb_info_aty128 {
    struct fb_info fb_info;
    struct fb_info_aty128 *next;
    struct aty128_constants constants;  /* PLL and others      */
    unsigned long regbase_phys;         /* physical mmio       */
    void *regbase;                      /* remapped mmio       */
    unsigned long frame_buffer_phys;    /* physical fb memory  */
    void *frame_buffer;                 /* remaped framebuffer */
    u32 vram_size;                      /* onboard video ram   */
    int chip_gen;
    const struct aty128_meminfo *mem;   /* onboard mem info    */
    struct aty128fb_par default_par, current_par;
    struct display disp;
    struct { u8 red, green, blue, pad; } palette[256];
    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;
#ifdef CONFIG_PCI
    struct pci_dev *pdev;
#endif
#ifdef CONFIG_MTRR
    struct { int vram; int vram_valid; } mtrr;
#endif
    int currcon;
    int blitter_may_be_busy;
    int fifo_slots;                 /* free slots in FIFO (64 max) */
#ifdef CONFIG_PMAC_PBOOK
    unsigned char *save_framebuffer;
    int	pm_reg;
    int crt_on, lcd_on;
    u32 save_lcd_gen_cntl;
#endif
};

static struct fb_info_aty128 *board_list = NULL;

#ifdef CONFIG_PMAC_PBOOK
  int aty128_sleep_notify(struct pmu_sleep_notifier *self, int when);
  static struct pmu_sleep_notifier aty128_sleep_notifier = {
  	aty128_sleep_notify, SLEEP_LEVEL_VIDEO,
  };
#endif

#define round_div(n, d) ((n+(d/2))/d)

    /*
     *  Interface used by the world
     */

int aty128fb_setup(char *options);

static int aty128fb_get_fix(struct fb_fix_screeninfo *fix, int con,
		       struct fb_info *info);
static int aty128fb_get_var(struct fb_var_screeninfo *var, int con,
		       struct fb_info *info);
static int aty128fb_set_var(struct fb_var_screeninfo *var, int con,
		       struct fb_info *info);
static int aty128fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			struct fb_info *info);
static int aty128fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			struct fb_info *info);
static int aty128fb_pan_display(struct fb_var_screeninfo *var, int con,
			   struct fb_info *fb);
static int aty128fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
		       u_long arg, int con, struct fb_info *info);
static int aty128fb_rasterimg(struct fb_info *info, int start);


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

int aty128fb_init(void);
static int aty128fbcon_switch(int con, struct fb_info *fb);
static void aty128fbcon_blank(int blank, struct fb_info *fb);

    /*
     *  Internal routines
     */

static void aty128_encode_fix(struct fb_fix_screeninfo *fix,
				struct aty128fb_par *par,
				const struct fb_info_aty128 *info);
static void aty128_set_dispsw(struct display *disp,
			struct fb_info_aty128 *info, int bpp, int accel);
static int aty128_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
				u_int *transp, struct fb_info *info);
static int aty128_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
				u_int transp, struct fb_info *info);
static void do_install_cmap(int con, struct fb_info *info);
static int aty128_encode_var(struct fb_var_screeninfo *var,
                             const struct aty128fb_par *par,
                             const struct fb_info_aty128 *info);
static int aty128_decode_var(struct fb_var_screeninfo *var,
                             struct aty128fb_par *par,
                             const struct fb_info_aty128 *info);
static int aty128_pci_register(struct pci_dev *pdev,
                               const struct aty128_chip_info *aci);
static struct fb_info_aty128 *aty128_board_list_add(struct fb_info_aty128
				*board_list, struct fb_info_aty128 *new_node);
#if !defined(CONFIG_PPC) && !defined(__sparc__)
static void __init aty128_get_pllinfo(struct fb_info_aty128 *info,
			char *bios_seg);
static char __init *aty128find_ROM(struct fb_info_aty128 *info);
#endif
static void aty128_timings(struct fb_info_aty128 *info);
static void aty128_init_engine(const struct aty128fb_par *par, 
				struct fb_info_aty128 *info);
static void aty128_reset_engine(const struct fb_info_aty128 *info);
static void aty128_flush_pixel_cache(const struct fb_info_aty128 *info);
static void do_wait_for_fifo(u16 entries, struct fb_info_aty128 *info);
static void wait_for_fifo(u16 entries, struct fb_info_aty128 *info);
static void wait_for_idle(struct fb_info_aty128 *info);
static u32 depth_to_dst(u32 depth);

#ifdef FBCON_HAS_CFB8
static struct display_switch fbcon_aty128_8;
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_aty128_16;
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_aty128_24;
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_aty128_32;
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

static struct fb_ops aty128fb_ops = {
	owner:		THIS_MODULE,
	fb_get_fix:	aty128fb_get_fix,
	fb_get_var:	aty128fb_get_var,
	fb_set_var:	aty128fb_set_var,
	fb_get_cmap:	aty128fb_get_cmap,
	fb_set_cmap:	aty128fb_set_cmap,
	fb_pan_display:	aty128fb_pan_display,
	fb_ioctl:	aty128fb_ioctl,
	fb_rasterimg:	aty128fb_rasterimg,
};

#ifdef CONFIG_PMAC_BACKLIGHT
static int aty128_set_backlight_enable(int on, int level, void* data);
static int aty128_set_backlight_level(int level, void* data);

static struct backlight_controller aty128_backlight_controller = {
	aty128_set_backlight_enable,
	aty128_set_backlight_level
};
#endif /* CONFIG_PMAC_BACKLIGHT */

    /*
     * Functions to read from/write to the mmio registers
     *	- endian conversions may possibly be avoided by
     *    using the other register aperture. TODO.
     */
static inline u32
_aty_ld_le32(volatile unsigned int regindex, 
                              const struct fb_info_aty128 *info)
{
    u32 val;

#if defined(__powerpc__)
    asm("lwbrx %0,%1,%2;eieio" : "=r"(val) : "b"(regindex), "r"(info->regbase));
#else
    val = readl (info->regbase + regindex);
#endif

    return val;
}