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linux/drivers/video/matrox/g450_pll.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

480 lines
12 KiB
C
Raw Blame History

/*
*
* Hardware accelerated Matrox PCI cards - G450/G550 PLL control.
*
* (c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
*
* Portions Copyright (c) 2001 Matrox Graphics Inc.
*
* Version: 1.64 2002/06/10
*
* 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 "g450_pll.h"
#include "matroxfb_DAC1064.h"
static inline unsigned int g450_vco2f(unsigned char p, unsigned int fvco) {
return (p & 0x40) ? fvco : fvco >> ((p & 3) + 1);
}
static inline unsigned int g450_f2vco(unsigned char p, unsigned int fin) {
return (p & 0x40) ? fin : fin << ((p & 3) + 1);
}
static unsigned int g450_mnp2vco(CPMINFO unsigned int mnp) {
unsigned int m, n;
m = ((mnp >> 16) & 0x0FF) + 1;
n = ((mnp >> 7) & 0x1FE) + 4;
return (ACCESS_FBINFO(features).pll.ref_freq * n + (m >> 1)) / m;
}
unsigned int g450_mnp2f(CPMINFO unsigned int mnp) {
return g450_vco2f(mnp, g450_mnp2vco(PMINFO mnp));
}
static inline unsigned int pll_freq_delta(unsigned int f1, unsigned int f2) {
if (f2 < f1) {
f2 = f1 - f2;
} else {
f2 = f2 - f1;
}
return f2;
}
#define NO_MORE_MNP 0x01FFFFFF
#define G450_MNP_FREQBITS (0xFFFFFF43) /* do not mask high byte so we'll catch NO_MORE_MNP */
static unsigned int g450_nextpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* fvco, unsigned int mnp) {
unsigned int m, n, p;
unsigned int tvco = *fvco;
m = (mnp >> 16) & 0xFF;
p = mnp & 0xFF;
do {
if (m == 0 || m == 0xFF) {
if (m == 0) {
if (p & 0x40) {
return NO_MORE_MNP;
}
if (p & 3) {
p--;
} else {
p = 0x40;
}
tvco >>= 1;
if (tvco < pi->vcomin) {
return NO_MORE_MNP;
}
*fvco = tvco;
}
p &= 0x43;
if (tvco < 550000) {
/* p |= 0x00; */
} else if (tvco < 700000) {
p |= 0x08;
} else if (tvco < 1000000) {
p |= 0x10;
} else if (tvco < 1150000) {
p |= 0x18;
} else {
p |= 0x20;
}
m = 9;
} else {
m--;
}
n = ((tvco * (m+1) + ACCESS_FBINFO(features).pll.ref_freq) / (ACCESS_FBINFO(features).pll.ref_freq * 2)) - 2;
} while (n < 0x03 || n > 0x7A);
return (m << 16) | (n << 8) | p;
}
static unsigned int g450_firstpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* vco, unsigned int fout) {
unsigned int p;
unsigned int vcomax;
vcomax = pi->vcomax;
if (fout > (vcomax / 2)) {
if (fout > vcomax) {
*vco = vcomax;
} else {
*vco = fout;
}
p = 0x40;
} else {
unsigned int tvco;
p = 3;
tvco = g450_f2vco(p, fout);
while (p && (tvco > vcomax)) {
p--;
tvco >>= 1;
}
if (tvco < pi->vcomin) {
tvco = pi->vcomin;
}
*vco = tvco;
}
return g450_nextpll(PMINFO pi, vco, 0xFF0000 | p);
}
static inline unsigned int g450_setpll(CPMINFO unsigned int mnp, unsigned int pll) {
switch (pll) {
case M_PIXEL_PLL_A:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAP, mnp);
return M1064_XPIXPLLSTAT;
case M_PIXEL_PLL_B:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBP, mnp);
return M1064_XPIXPLLSTAT;
case M_PIXEL_PLL_C:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCP, mnp);
return M1064_XPIXPLLSTAT;
case M_SYSTEM_PLL:
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLM, mnp >> 16);
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLN, mnp >> 8);
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLP, mnp);
return DAC1064_XSYSPLLSTAT;
case M_VIDEO_PLL:
matroxfb_DAC_out(PMINFO M1064_XVIDPLLM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XVIDPLLN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XVIDPLLP, mnp);
return M1064_XVIDPLLSTAT;
}
return 0;
}
static inline unsigned int g450_cmppll(CPMINFO unsigned int mnp, unsigned int pll) {
unsigned char m = mnp >> 16;
unsigned char n = mnp >> 8;
unsigned char p = mnp;
switch (pll) {
case M_PIXEL_PLL_A:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLAM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLAN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLAP) != p);
case M_PIXEL_PLL_B:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLBM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLBN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLBP) != p);
case M_PIXEL_PLL_C:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLCP) != p);
case M_SYSTEM_PLL:
return (matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLM) != m ||
matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLN) != n ||
matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLP) != p);
case M_VIDEO_PLL:
return (matroxfb_DAC_in(PMINFO M1064_XVIDPLLM) != m ||
matroxfb_DAC_in(PMINFO M1064_XVIDPLLN) != n ||
matroxfb_DAC_in(PMINFO M1064_XVIDPLLP) != p);
}
return 1;
}
static inline int g450_isplllocked(CPMINFO unsigned int regidx) {
unsigned int j;
for (j = 0; j < 1000; j++) {
if (matroxfb_DAC_in(PMINFO regidx) & 0x40) {
unsigned int r = 0;
int i;
for (i = 0; i < 100; i++) {
r += matroxfb_DAC_in(PMINFO regidx) & 0x40;
}
return r >= (90 * 0x40);
}
/* udelay(1)... but DAC_in is much slower... */
}
return 0;
}
static int g450_testpll(CPMINFO unsigned int mnp, unsigned int pll) {
return g450_isplllocked(PMINFO g450_setpll(PMINFO mnp, pll));
}
static void updatehwstate_clk(struct matrox_hw_state* hw, unsigned int mnp, unsigned int pll) {
switch (pll) {
case M_SYSTEM_PLL:
hw->DACclk[3] = mnp >> 16;
hw->DACclk[4] = mnp >> 8;
hw->DACclk[5] = mnp;
break;
}
}
void matroxfb_g450_setpll_cond(WPMINFO unsigned int mnp, unsigned int pll) {
if (g450_cmppll(PMINFO mnp, pll)) {
g450_setpll(PMINFO mnp, pll);
}
}
static inline unsigned int g450_findworkingpll(WPMINFO unsigned int pll, unsigned int* mnparray, unsigned int mnpcount) {
unsigned int found = 0;
unsigned int idx;
unsigned int mnpfound = mnparray[0];
for (idx = 0; idx < mnpcount; idx++) {
unsigned int sarray[3];
unsigned int *sptr;
{
unsigned int mnp;
sptr = sarray;
mnp = mnparray[idx];
if (mnp & 0x38) {
*sptr++ = mnp - 8;
}
if ((mnp & 0x38) != 0x38) {
*sptr++ = mnp + 8;
}
*sptr = mnp;
}
while (sptr >= sarray) {
unsigned int mnp = *sptr--;
if (g450_testpll(PMINFO mnp - 0x0300, pll) &&
g450_testpll(PMINFO mnp + 0x0300, pll) &&
g450_testpll(PMINFO mnp - 0x0200, pll) &&
g450_testpll(PMINFO mnp + 0x0200, pll) &&
g450_testpll(PMINFO mnp - 0x0100, pll) &&
g450_testpll(PMINFO mnp + 0x0100, pll)) {
if (g450_testpll(PMINFO mnp, pll)) {
return mnp;
}
} else if (!found && g450_testpll(PMINFO mnp, pll)) {
mnpfound = mnp;
found = 1;
}
}
}
g450_setpll(PMINFO mnpfound, pll);
return mnpfound;
}
static void g450_addcache(struct matrox_pll_cache* ci, unsigned int mnp_key, unsigned int mnp_value) {
if (++ci->valid > ARRAY_SIZE(ci->data)) {
ci->valid = ARRAY_SIZE(ci->data);
}
memmove(ci->data + 1, ci->data, (ci->valid - 1) * sizeof(*ci->data));
ci->data[0].mnp_key = mnp_key & G450_MNP_FREQBITS;
ci->data[0].mnp_value = mnp_value;
}
static int g450_checkcache(WPMINFO struct matrox_pll_cache* ci, unsigned int mnp_key) {
unsigned int i;
mnp_key &= G450_MNP_FREQBITS;
for (i = 0; i < ci->valid; i++) {
if (ci->data[i].mnp_key == mnp_key) {
unsigned int mnp;
mnp = ci->data[i].mnp_value;
if (i) {
memmove(ci->data + 1, ci->data, i * sizeof(*ci->data));
ci->data[0].mnp_key = mnp_key;
ci->data[0].mnp_value = mnp;
}
return mnp;
}
}
return NO_MORE_MNP;
}
static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
unsigned int* mnparray, unsigned int* deltaarray) {
unsigned int mnpcount;
unsigned int pixel_vco;
const struct matrox_pll_limits* pi;
struct matrox_pll_cache* ci;
pixel_vco = 0;
switch (pll) {
case M_PIXEL_PLL_A:
case M_PIXEL_PLL_B:
case M_PIXEL_PLL_C:
{
u_int8_t tmp;
unsigned long flags;
matroxfb_DAC_lock_irqsave(flags);
tmp = matroxfb_DAC_in(PMINFO M1064_XPIXCLKCTRL);
if (!(tmp & M1064_XPIXCLKCTRL_PLL_UP)) {
matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp | M1064_XPIXCLKCTRL_PLL_UP);
}
matroxfb_DAC_unlock_irqrestore(flags);
}
{
u_int8_t misc;
misc = mga_inb(M_MISC_REG_READ) & ~0x0C;
switch (pll) {
case M_PIXEL_PLL_A:
break;
case M_PIXEL_PLL_B:
misc |= 0x04;
break;
default:
misc |= 0x0C;
break;
}
mga_outb(M_MISC_REG, misc);
}
pi = &ACCESS_FBINFO(limits.pixel);
ci = &ACCESS_FBINFO(cache.pixel);
break;
case M_SYSTEM_PLL:
{
u_int32_t opt;
pci_read_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, &opt);
if (!(opt & 0x20)) {
pci_write_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, opt | 0x20);
}
}
pi = &ACCESS_FBINFO(limits.system);
ci = &ACCESS_FBINFO(cache.system);
break;
case M_VIDEO_PLL:
{
u_int8_t tmp;
unsigned int mnp;
unsigned long flags;
matroxfb_DAC_lock_irqsave(flags);
tmp = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
if (!(tmp & 2)) {
matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, tmp | 2);
}
mnp = matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) << 16;
mnp |= matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) << 8;
pixel_vco = g450_mnp2vco(PMINFO mnp);
matroxfb_DAC_unlock_irqrestore(flags);
}
pi = &ACCESS_FBINFO(limits.video);
ci = &ACCESS_FBINFO(cache.video);
break;
default:
return -EINVAL;
}
mnpcount = 0;
{
unsigned int mnp;
unsigned int xvco;
for(mnp = g450_firstpll(PMINFO pi, &xvco, fout); mnp != NO_MORE_MNP; mnp = g450_nextpll(PMINFO pi, &xvco, mnp)) {
unsigned int idx;
unsigned int vco;
unsigned int delta;
vco = g450_mnp2vco(PMINFO mnp);
#if 0
if (pll == M_VIDEO_PLL) {
unsigned int big, small;
if (vco < pixel_vco) {
small = vco;
big = pixel_vco;
} else {
small = pixel_vco;
big = vco;
}
while (big > small) {
big >>= 1;
}
if (big == small) {
continue;
}
}
#endif
delta = pll_freq_delta(fout, g450_vco2f(mnp, vco));
for (idx = mnpcount; idx > 0; idx--) {
/* == is important; due to nextpll algorithm we get
sorted equally good frequencies from lower VCO
frequency to higher - with <= lowest wins, while
with < highest one wins */
if (delta <= deltaarray[idx-1]) {
mnparray[idx] = mnparray[idx-1];
deltaarray[idx] = deltaarray[idx-1];
} else {
break;
}
}
mnparray[idx] = mnp;
deltaarray[idx] = delta;
mnpcount++;
}
}
/* VideoPLL and PixelPLL matched: do nothing... In all other cases we should get at least one frequency */
if (!mnpcount) {
return -EBUSY;
}
{
unsigned long flags;
unsigned int mnp;
matroxfb_DAC_lock_irqsave(flags);
mnp = g450_checkcache(PMINFO ci, mnparray[0]);
if (mnp != NO_MORE_MNP) {
matroxfb_g450_setpll_cond(PMINFO mnp, pll);
} else {
mnp = g450_findworkingpll(PMINFO pll, mnparray, mnpcount);
g450_addcache(ci, mnparray[0], mnp);
}
updatehwstate_clk(&ACCESS_FBINFO(hw), mnp, pll);
matroxfb_DAC_unlock_irqrestore(flags);
return mnp;
}
}
/* It must be greater than number of possible PLL values.
* Currently there is 5(p) * 10(m) = 50 possible values. */
#define MNP_TABLE_SIZE 64
int matroxfb_g450_setclk(WPMINFO unsigned int fout, unsigned int pll) {
unsigned int* arr;
arr = kmalloc(sizeof(*arr) * MNP_TABLE_SIZE * 2, GFP_KERNEL);
if (arr) {
int r;
r = __g450_setclk(PMINFO fout, pll, arr, arr + MNP_TABLE_SIZE);
kfree(arr);
return r;
}
return -ENOMEM;
}
EXPORT_SYMBOL(matroxfb_g450_setclk);
EXPORT_SYMBOL(g450_mnp2f);
EXPORT_SYMBOL(matroxfb_g450_setpll_cond);
MODULE_AUTHOR("(c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Matrox G450/G550 PLL driver");
MODULE_LICENSE("GPL");
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