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tdfxfb: code improvements 

This patch improves source code mainly by killing redundant variable loads,
reducing number of variables, simplifying conditional branches, etc.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Krzysztof Helt 2007-10-16 01:28:48 -07:00 committed by Linus Torvalds
parent 9d775e17b5
commit 4f05b53b28
2 changed files with 47 additions and 117 deletions
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161
drivers/video/tdfxfb.c
View File

@ -63,12 +63,9 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/nvram.h>
#include <asm/io.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
@ -159,26 +156,15 @@ static char *mode_option __devinitdata = NULL;
* Hardware-specific funcions
* ------------------------------------------------------------------------- */
#ifdef VGA_REG_IO
static inline u8 vga_inb(struct tdfx_par *par, u32 reg)
{
return inb(reg);
}
static inline void vga_outb(struct tdfx_par *par, u32 reg, u8 val)
{
outb(val, reg);
}
#else
static inline u8 vga_inb(struct tdfx_par *par, u32 reg)
{
return inb(par->iobase + reg - 0x300);
}
static inline void vga_outb(struct tdfx_par *par, u32 reg, u8 val)
{
outb(val, par->iobase + reg - 0x300);
}
#endif
static inline void gra_outb(struct tdfx_par *par, u32 idx, u8 val)
{
@ -279,11 +265,11 @@ static int banshee_wait_idle(struct fb_info *info)
banshee_make_room(par, 1);
tdfx_outl(par, COMMAND_3D, COMMAND_3D_NOP);
while (1) {
i = (tdfx_inl(par, STATUS) & STATUS_BUSY) ? 0 : i + 1;
if (i == 3)
break;
}
do {
if ((tdfx_inl(par, STATUS) & STATUS_BUSY) == 0)
i++;
} while (i < 3);
return 0;
}
@ -313,16 +299,17 @@ static u32 do_calc_pll(int freq, int *freq_out)
* Estimate value of n that produces target frequency
* with current m and k
*/
int n_estimated = (freq * (m + 2) * (1 << k) / fref) - 2;
int n_estimated = ((freq * (m + 2) << k) / fref) - 2;
/* Search neighborhood of estimated n */
for (n = max(0, n_estimated - 1);
n <= min(255, n_estimated + 1); n++) {
for (n = max(0, n_estimated);
n <= min(255, n_estimated + 1);
n++) {
/*
* Calculate PLL freqency with current m, k and
* estimated n
*/
int f = fref * (n + 2) / (m + 2) / (1 << k);
int f = (fref * (n + 2) / (m + 2)) >> k;
int error = abs(f - freq);
/*
@ -342,7 +329,7 @@ static u32 do_calc_pll(int freq, int *freq_out)
n = best_n;
m = best_m;
k = best_k;
*freq_out = fref * (n + 2) / (m + 2) / (1 << k);
*freq_out = (fref * (n + 2) / (m + 2)) >> k;
return (n << 8) | (m << 2) | k;
}
@ -387,7 +374,7 @@ static void do_write_regs(struct fb_info *info, struct banshee_reg *reg)
vga_enable_palette(par);
vga_enable_video(par);
banshee_make_room(par, 11);
banshee_make_room(par, 9);
tdfx_outl(par, VGAINIT0, reg->vgainit0);
tdfx_outl(par, DACMODE, reg->dacmode);
tdfx_outl(par, VIDDESKSTRIDE, reg->stride);
@ -400,8 +387,8 @@ static void do_write_regs(struct fb_info *info, struct banshee_reg *reg)
tdfx_outl(par, MISCINIT0, reg->miscinit0);
banshee_make_room(par, 8);
tdfx_outl(par, SRCBASE, reg->srcbase);
tdfx_outl(par, DSTBASE, reg->dstbase);
tdfx_outl(par, SRCBASE, reg->startaddr);
tdfx_outl(par, DSTBASE, reg->startaddr);
tdfx_outl(par, COMMANDEXTRA_2D, 0);
tdfx_outl(par, CLIP0MIN, 0);
tdfx_outl(par, CLIP0MAX, 0x0fff0fff);
@ -414,32 +401,24 @@ static void do_write_regs(struct fb_info *info, struct banshee_reg *reg)
static unsigned long do_lfb_size(struct tdfx_par *par, unsigned short dev_id)
{
u32 draminit0;
u32 draminit1;
u32 draminit0 = tdfx_inl(par, DRAMINIT0);
u32 draminit1 = tdfx_inl(par, DRAMINIT1);
u32 miscinit1;
int num_chips;
int num_chips = (draminit0 & DRAMINIT0_SGRAM_NUM) ? 8 : 4;
int chip_size; /* in MB */
u32 lfbsize;
int has_sgram;
draminit0 = tdfx_inl(par, DRAMINIT0);
draminit1 = tdfx_inl(par, DRAMINIT1);
num_chips = (draminit0 & DRAMINIT0_SGRAM_NUM) ? 8 : 4;
int has_sgram = draminit1 & DRAMINIT1_MEM_SDRAM;
if (dev_id < PCI_DEVICE_ID_3DFX_VOODOO5) {
/* Banshee/Voodoo3 */
has_sgram = draminit1 & DRAMINIT1_MEM_SDRAM;
chip_size = 2;
if (has_sgram)
chip_size = (draminit0 & DRAMINIT0_SGRAM_TYPE) ? 2 : 1;
if (has_sgram && (draminit0 & DRAMINIT0_SGRAM_TYPE))
chip_size = 1;
} else {
/* Voodoo4/5 */
has_sgram = 0;
chip_size = 1 << ((draminit0 & DRAMINIT0_SGRAM_TYPE_MASK) >> DRAMINIT0_SGRAM_TYPE_SHIFT);
chip_size = draminit0 & DRAMINIT0_SGRAM_TYPE_MASK;
chip_size = 1 << (chip_size >> DRAMINIT0_SGRAM_TYPE_SHIFT);
}
lfbsize = num_chips * chip_size * 1024 * 1024;
/* disable block writes for SDRAM */
miscinit1 = tdfx_inl(par, MISCINIT1);
@ -448,7 +427,7 @@ static unsigned long do_lfb_size(struct tdfx_par *par, unsigned short dev_id)
banshee_make_room(par, 1);
tdfx_outl(par, MISCINIT1, miscinit1);
return lfbsize;
return num_chips * chip_size * 1024l * 1024;
}
/* ------------------------------------------------------------------------- */
@ -548,17 +527,18 @@ static int tdfxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
static int tdfxfb_set_par(struct fb_info *info)
{
struct tdfx_par *par = info->par;
u32 hdispend, hsyncsta, hsyncend, htotal;
u32 hdispend = info->var.xres;
u32 hsyncsta = hdispend + info->var.right_margin;
u32 hsyncend = hsyncsta + info->var.hsync_len;
u32 htotal = hsyncend + info->var.left_margin;
u32 hd, hs, he, ht, hbs, hbe;
u32 vd, vs, ve, vt, vbs, vbe;
struct banshee_reg reg;
int fout, freq;
u32 wd, cpp;
par->baseline = 0;
u32 wd;
u32 cpp = (info->var.bits_per_pixel + 7) >> 3;
memset(&reg, 0, sizeof(reg));
cpp = (info->var.bits_per_pixel + 7) / 8;
reg.vidcfg = VIDCFG_VIDPROC_ENABLE | VIDCFG_DESK_ENABLE |
VIDCFG_CURS_X11 |
@ -568,14 +548,8 @@ static int tdfxfb_set_par(struct fb_info *info)
/* PLL settings */
freq = PICOS2KHZ(info->var.pixclock);
reg.dacmode = 0;
reg.vidcfg &= ~VIDCFG_2X;
hdispend = info->var.xres;
hsyncsta = hdispend + info->var.right_margin;
hsyncend = hsyncsta + info->var.hsync_len;
htotal = hsyncend + info->var.left_margin;
if (freq > par->max_pixclock / 2) {
freq = freq > par->max_pixclock ? par->max_pixclock : freq;
reg.dacmode |= DACMODE_2X;
@ -598,11 +572,16 @@ static int tdfxfb_set_par(struct fb_info *info)
vs = vd + (info->var.lower_margin << 1);
ve = vs + (info->var.vsync_len << 1);
vbe = vt = ve + (info->var.upper_margin << 1) - 1;
reg.screensize = info->var.xres | (info->var.yres << 13);
reg.vidcfg |= VIDCFG_HALF_MODE;
reg.crt[0x09] = 0x80;
} else {
vbs = vd = info->var.yres - 1;
vs = vd + info->var.lower_margin;
ve = vs + info->var.vsync_len;
vbe = vt = ve + info->var.upper_margin - 1;
reg.screensize = info->var.xres | (info->var.yres << 12);
reg.vidcfg &= ~VIDCFG_HALF_MODE;
}
/* this is all pretty standard VGA register stuffing */
@ -611,11 +590,6 @@ static int tdfxfb_set_par(struct fb_info *info)
info->var.xres < 480 ? 0x60 :
info->var.xres < 768 ? 0xe0 : 0x20);
reg.gra[0x00] = 0x00;
reg.gra[0x01] = 0x00;
reg.gra[0x02] = 0x00;
reg.gra[0x03] = 0x00;
reg.gra[0x04] = 0x00;
reg.gra[0x05] = 0x40;
reg.gra[0x06] = 0x05;
reg.gra[0x07] = 0x0f;
@ -638,10 +612,7 @@ static int tdfxfb_set_par(struct fb_info *info)
reg.att[0x0e] = 0x0e;
reg.att[0x0f] = 0x0f;
reg.att[0x10] = 0x41;
reg.att[0x11] = 0x00;
reg.att[0x12] = 0x0f;
reg.att[0x13] = 0x00;
reg.att[0x14] = 0x00;
reg.seq[0x00] = 0x03;
reg.seq[0x01] = 0x01; /* fixme: clkdiv2? */
@ -663,19 +634,11 @@ static int tdfxfb_set_par(struct fb_info *info)
((vs & 0x100) >> 6) |
((vd & 0x100) >> 7) |
((vt & 0x100) >> 8);
reg.crt[0x08] = 0x00;
reg.crt[0x09] = 0x40 | ((vbs & 0x200) >> 4);
reg.crt[0x0a] = 0x00;
reg.crt[0x0b] = 0x00;
reg.crt[0x0c] = 0x00;
reg.crt[0x0d] = 0x00;
reg.crt[0x0e] = 0x00;
reg.crt[0x0f] = 0x00;
reg.crt[0x09] |= 0x40 | ((vbs & 0x200) >> 4);
reg.crt[0x10] = vs;
reg.crt[0x11] = (ve & 0x0f) | 0x20;
reg.crt[0x12] = vd;
reg.crt[0x13] = wd;
reg.crt[0x14] = 0x00;
reg.crt[0x15] = vbs;
reg.crt[0x16] = vbe + 1;
reg.crt[0x17] = 0xc3;
@ -706,34 +669,15 @@ static int tdfxfb_set_par(struct fb_info *info)
reg.cursc1 = 0xffffff;
reg.stride = info->var.xres * cpp;
reg.startaddr = par->baseline * reg.stride;
reg.srcbase = reg.startaddr;
reg.dstbase = reg.startaddr;
reg.startaddr = info->var.yoffset * reg.stride
+ info->var.xoffset * cpp;
/* PLL settings */
freq = PICOS2KHZ(info->var.pixclock);
reg.dacmode &= ~DACMODE_2X;
reg.vidcfg &= ~VIDCFG_2X;
if (freq > par->max_pixclock / 2) {
freq = freq > par->max_pixclock ? par->max_pixclock : freq;
reg.dacmode |= DACMODE_2X;
reg.vidcfg |= VIDCFG_2X;
}
reg.vidpll = do_calc_pll(freq, &fout);
#if 0
reg.mempll = do_calc_pll(..., &fout);
reg.gfxpll = do_calc_pll(..., &fout);
#endif
if ((info->var.vmode & FB_VMODE_MASK) == FB_VMODE_DOUBLE) {
reg.screensize = info->var.xres | (info->var.yres << 13);
reg.vidcfg |= VIDCFG_HALF_MODE;
reg.crt[0x09] |= 0x80;
} else {
reg.screensize = info->var.xres | (info->var.yres << 12);
reg.vidcfg &= ~VIDCFG_HALF_MODE;
}
if ((info->var.vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED)
reg.vidcfg |= VIDCFG_INTERLACE;
reg.miscinit0 = tdfx_inl(par, MISCINIT0);
@ -758,8 +702,7 @@ static int tdfxfb_set_par(struct fb_info *info)
do_write_regs(info, &reg);
/* Now change fb_fix_screeninfo according to changes in par */
info->fix.line_length =
info->var.xres * ((info->var.bits_per_pixel + 7) >> 3);
info->fix.line_length = reg.stride;
info->fix.visual = (info->var.bits_per_pixel == 8)
? FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_TRUECOLOR;
@ -821,35 +764,28 @@ static int tdfxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
static int tdfxfb_blank(int blank, struct fb_info *info)
{
struct tdfx_par *par = info->par;
u32 dacmode, state = 0, vgablank = 0;
int vgablank = 1;
u32 dacmode = tdfx_inl(par, DACMODE);
dacmode = tdfx_inl(par, DACMODE);
dacmode &= ~(BIT(1) | BIT(3));
switch (blank) {
case FB_BLANK_UNBLANK: /* Screen: On; HSync: On, VSync: On */
state = 0;
vgablank = 0;
break;
case FB_BLANK_NORMAL: /* Screen: Off; HSync: On, VSync: On */
state = 0;
vgablank = 1;
break;
case FB_BLANK_VSYNC_SUSPEND: /* Screen: Off; HSync: On, VSync: Off */
state = BIT(3);
vgablank = 1;
dacmode |= BIT(3);
break;
case FB_BLANK_HSYNC_SUSPEND: /* Screen: Off; HSync: Off, VSync: On */
state = BIT(1);
vgablank = 1;
dacmode |= BIT(1);
break;
case FB_BLANK_POWERDOWN: /* Screen: Off; HSync: Off, VSync: Off */
state = BIT(1) | BIT(3);
vgablank = 1;
dacmode |= BIT(1) | BIT(3);
break;
}
dacmode &= ~(BIT(1) | BIT(3));
dacmode |= state;
banshee_make_room(par, 1);
tdfx_outl(par, DACMODE, dacmode);
if (vgablank)
@ -866,14 +802,13 @@ static int tdfxfb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct tdfx_par *par = info->par;
u32 addr;
u32 addr = var->yoffset * info->fix.line_length;
if (nopan || var->xoffset || (var->yoffset > var->yres_virtual))
return -EINVAL;
if ((var->yoffset + var->yres > var->yres_virtual && nowrap))
return -EINVAL;
addr = var->yoffset * info->fix.line_length;
banshee_make_room(par, 1);
tdfx_outl(par, VIDDESKSTART, addr);
@ -962,7 +897,6 @@ static void tdfxfb_copyarea(struct fb_info *info,
dx = 0;
}
if (area->sx <= area->dx) {
//-X
blitcmd |= BIT(14);
@ -1061,8 +995,7 @@ static void tdfxfb_imageblit(struct fb_info *info, const struct fb_image *image)
/* Send the leftovers now */
banshee_make_room(par, 3);
i = size % 4;
switch (i) {
switch (size % 4) {
case 0:
break;
case 1:

3
include/video/tdfx.h
View File

@ -167,8 +167,6 @@ struct banshee_reg {
unsigned long clip0max;
unsigned long clip1min;
unsigned long clip1max;
unsigned long srcbase;
unsigned long dstbase;
unsigned long miscinit0;
};
@ -177,7 +175,6 @@ struct tdfx_par {
u32 palette[16];
void __iomem *regbase_virt;
unsigned long iobase;
u32 baseline;
struct {
int w, u, d;