projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ebb68b BS |
1 | /* |
| 2 | * Copyright 2010 Red Hat Inc. | |
| 3 | * | |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
| 5 | * copy of this software and associated documentation files (the "Software"), | |
| 6 | * to deal in the Software without restriction, including without limitation | |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the | |
| 9 | * Software is furnished to do so, subject to the following conditions: | |
| 10 | * | |
| 11 | * The above copyright notice and this permission notice shall be included in | |
| 12 | * all copies or substantial portions of the Software. | |
| 13 | * | |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
| 20 | * OTHER DEALINGS IN THE SOFTWARE. | |
| 21 | * | |
| 22 | * Authors: Ben Skeggs | |
| 23 | */ | |
| 24 | ||
| 25 | #include "drmP.h" | |
| 26 | #include "drm_fixed.h" | |
| 27 | #include "nouveau_drv.h" | |
| 28 | #include "nouveau_hw.h" | |
| 29 | ||
| 30 | int | |
| 31 | nv50_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk, | |
| 32 | int *N1, int *M1, int *N2, int *M2, int *P) | |
| 33 | { | |
| 34 | struct nouveau_pll_vals pll_vals; | |
| 35 | int ret; | |
| 36 | ||
| 37 | ret = nouveau_calc_pll_mnp(dev, pll, clk, &pll_vals); | |
| 38 | if (ret <= 0) | |
| 39 | return ret; | |
| 40 | ||
| 41 | *N1 = pll_vals.N1; | |
| 42 | *M1 = pll_vals.M1; | |
| 43 | *N2 = pll_vals.N2; | |
| 44 | *M2 = pll_vals.M2; | |
| 45 | *P = pll_vals.log2P; | |
| 46 | return ret; | |
| 47 | } | |
| 48 | ||
| 49 | int | |
| 50 | nv50_calc_pll2(struct drm_device *dev, struct pll_lims *pll, int clk, | |
| 51 | int *N, int *fN, int *M, int *P) | |
| 52 | { | |
| 53 | fixed20_12 fb_div, a, b; | |
| 2a56a0b9 BS |
54 | u32 refclk = pll->refclk / 10; |
| 55 | u32 max_vco_freq = pll->vco1.maxfreq / 10; | |
| 56 | u32 max_vco_inputfreq = pll->vco1.max_inputfreq / 10; | |
| 57 | clk /= 10; | |
| e9ebb68b | 58 | |
| 2a56a0b9 | 59 | *P = max_vco_freq / clk; |
| e9ebb68b BS |
60 | if (*P > pll->max_p) |
| 61 | *P = pll->max_p; | |
| 62 | if (*P < pll->min_p) | |
| 63 | *P = pll->min_p; | |
| 64 | ||
| 2a56a0b9 BS |
65 | /* *M = floor((refclk + max_vco_inputfreq) / max_vco_inputfreq); */ |
| 66 | a.full = dfixed_const(refclk + max_vco_inputfreq); | |
| 67 | b.full = dfixed_const(max_vco_inputfreq); | |
| e9ebb68b | 68 | a.full = dfixed_div(a, b); |
| 2a56a0b9 | 69 | a.full = dfixed_floor(a); |
| e9ebb68b BS |
70 | *M = dfixed_trunc(a); |
| 71 | ||
| 72 | /* fb_div = (vco * *M) / refclk; */ | |
| 73 | fb_div.full = dfixed_const(clk * *P); | |
| 74 | fb_div.full = dfixed_mul(fb_div, a); | |
| 2a56a0b9 | 75 | a.full = dfixed_const(refclk); |
| e9ebb68b BS |
76 | fb_div.full = dfixed_div(fb_div, a); |
| 77 | ||
| 78 | /* *N = floor(fb_div); */ | |
| 79 | a.full = dfixed_floor(fb_div); | |
| 80 | *N = dfixed_trunc(fb_div); | |
| 81 | ||
| 82 | /* *fN = (fmod(fb_div, 1.0) * 8192) - 4096; */ | |
| 83 | b.full = dfixed_const(8192); | |
| 84 | a.full = dfixed_mul(a, b); | |
| 85 | fb_div.full = dfixed_mul(fb_div, b); | |
| 86 | fb_div.full = fb_div.full - a.full; | |
| 87 | *fN = dfixed_trunc(fb_div) - 4096; | |
| 88 | *fN &= 0xffff; | |
| 89 | ||
| 90 | return clk; | |
| 91 | } |