87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
|
|
* Copyright 2010 Red Hat Inc.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
* OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Authors: Ben Skeggs
|
|
*/
|
|
|
|
#include "drmP.h"
|
|
#include "drm_fixed.h"
|
|
#include "nouveau_drv.h"
|
|
#include "nouveau_hw.h"
|
|
|
|
int
|
|
nv50_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk,
|
|
int *N1, int *M1, int *N2, int *M2, int *P)
|
|
{
|
|
struct nouveau_pll_vals pll_vals;
|
|
int ret;
|
|
|
|
ret = nouveau_calc_pll_mnp(dev, pll, clk, &pll_vals);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
*N1 = pll_vals.N1;
|
|
*M1 = pll_vals.M1;
|
|
*N2 = pll_vals.N2;
|
|
*M2 = pll_vals.M2;
|
|
*P = pll_vals.log2P;
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
nv50_calc_pll2(struct drm_device *dev, struct pll_lims *pll, int clk,
|
|
int *N, int *fN, int *M, int *P)
|
|
{
|
|
fixed20_12 fb_div, a, b;
|
|
|
|
*P = pll->vco1.maxfreq / clk;
|
|
if (*P > pll->max_p)
|
|
*P = pll->max_p;
|
|
if (*P < pll->min_p)
|
|
*P = pll->min_p;
|
|
|
|
/* *M = ceil(refclk / pll->vco.max_inputfreq); */
|
|
a.full = dfixed_const(pll->refclk);
|
|
b.full = dfixed_const(pll->vco1.max_inputfreq);
|
|
a.full = dfixed_div(a, b);
|
|
a.full = dfixed_ceil(a);
|
|
*M = dfixed_trunc(a);
|
|
|
|
/* fb_div = (vco * *M) / refclk; */
|
|
fb_div.full = dfixed_const(clk * *P);
|
|
fb_div.full = dfixed_mul(fb_div, a);
|
|
a.full = dfixed_const(pll->refclk);
|
|
fb_div.full = dfixed_div(fb_div, a);
|
|
|
|
/* *N = floor(fb_div); */
|
|
a.full = dfixed_floor(fb_div);
|
|
*N = dfixed_trunc(fb_div);
|
|
|
|
/* *fN = (fmod(fb_div, 1.0) * 8192) - 4096; */
|
|
b.full = dfixed_const(8192);
|
|
a.full = dfixed_mul(a, b);
|
|
fb_div.full = dfixed_mul(fb_div, b);
|
|
fb_div.full = fb_div.full - a.full;
|
|
*fN = dfixed_trunc(fb_div) - 4096;
|
|
*fN &= 0xffff;
|
|
|
|
return clk;
|
|
}
|