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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 "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_pm.h"
/*XXX: boards using limits 0x40 need fixing, the register layout
* is correct here, but, there's some other funny magic
* that modifies things, so it's not likely we'll set/read
* the correct timings yet.. working on it...
*/
struct nv50_pm_state {
struct pll_lims pll;
enum pll_types type;
int N, M, P;
};
int
nv50_pm_clock_get(struct drm_device *dev, u32 id)
{
struct pll_lims pll;
int P, N, M, ret;
u32 reg0, reg1;
ret = get_pll_limits(dev, id, &pll);
if (ret)
return ret;
if (pll.vco2.maxfreq) {
reg0 = nv_rd32(dev, pll.reg + 0);
reg1 = nv_rd32(dev, pll.reg + 4);
P = (reg0 & 0x00070000) >> 16;
N = (reg1 & 0x0000ff00) >> 8;
M = (reg1 & 0x000000ff);
return ((pll.refclk * N / M) >> P);
}
reg0 = nv_rd32(dev, pll.reg + 4);
P = (reg0 & 0x003f0000) >> 16;
N = (reg0 & 0x0000ff00) >> 8;
M = (reg0 & 0x000000ff);
return pll.refclk * N / M / P;
}
void *
nv50_pm_clock_pre(struct drm_device *dev, u32 id, int khz)
{
struct nv50_pm_state *state;
int dummy, ret;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return ERR_PTR(-ENOMEM);
state->type = id;
ret = get_pll_limits(dev, id, &state->pll);
if (ret < 0) {
kfree(state);
return ERR_PTR(ret);
}
ret = nv50_calc_pll(dev, &state->pll, khz, &state->N, &state->M,
&dummy, &dummy, &state->P);
if (ret < 0) {
kfree(state);
return ERR_PTR(ret);
}
return state;
}
void
nv50_pm_clock_set(struct drm_device *dev, void *pre_state)
{
struct nv50_pm_state *state = pre_state;
u32 reg = state->pll.reg, tmp;
int N = state->N;
int M = state->M;
int P = state->P;
if (state->pll.vco2.maxfreq) {
if (state->type == PLL_MEMORY) {
nv_wr32(dev, 0x100210, 0);
nv_wr32(dev, 0x1002dc, 1);
}
tmp = nv_rd32(dev, reg + 0) & 0xfff8ffff;
tmp |= 0x80000000 | (P << 16);
nv_wr32(dev, reg + 0, tmp);
nv_wr32(dev, reg + 4, (N << 8) | M);
if (state->type == PLL_MEMORY) {
nv_wr32(dev, 0x1002dc, 0);
nv_wr32(dev, 0x100210, 0x80000000);
}
} else {
nv_wr32(dev, reg + 4, (P << 16) | (N << 8) | M);
}
kfree(state);
}
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