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/*
* 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 "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
nva3_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk,
int *pN, int *pfN, int *pM, int *P)
{
u32 best_err = ~0, err;
int M, lM, hM, N, fN;

*P = pll->vco1.maxfreq / clk;
if (*P > pll->max_p)
*P = pll->max_p;
if (*P < pll->min_p)
*P = pll->min_p;

lM = (pll->refclk + pll->vco1.max_inputfreq) / pll->vco1.max_inputfreq;
lM = max(lM, (int)pll->vco1.min_m);
hM = (pll->refclk + pll->vco1.min_inputfreq) / pll->vco1.min_inputfreq;
hM = min(hM, (int)pll->vco1.max_m);

for (M = lM; M <= hM; M++) {
u32 tmp = clk * *P * M;
N = tmp / pll->refclk;
fN = tmp % pll->refclk;
if (!pfN && fN >= pll->refclk / 2)
N++;

if (N < pll->vco1.min_n)
continue;
if (N > pll->vco1.max_n)
break;

err = abs(clk - (pll->refclk * N / M / *P));
if (err < best_err) {
best_err = err;
*pN = N;
*pM = M;
}

if (pfN) {
*pfN = (((fN << 13) / pll->refclk) - 4096) & 0xffff;
return clk;
}
}

if (unlikely(best_err == ~0)) {
NV_ERROR(dev, "unable to find matching pll values\n");
return -EINVAL;
}

return pll->refclk * *pN / *pM / *P;
}
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