drivers/gpu/drm/nouveau/nvkm/subdev/clk/gf100.c - linux - Git at Google

 /*
  * Copyright 2012 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
  */
 #define gf100_clk(p) container_of((p), struct gf100_clk, base)
 #include "priv.h"
 #include "pll.h"

 #include <subdev/bios.h>
 #include <subdev/bios/pll.h>
 #include <subdev/timer.h>

 struct gf100_clk_info {
 	u32 freq;
 	u32 ssel;
 	u32 mdiv;
 	u32 dsrc;
 	u32 ddiv;
 	u32 coef;
 };

 struct gf100_clk {
 	struct nvkm_clk base;
 	struct gf100_clk_info eng[16];
 };

 static u32 read_div(struct gf100_clk *, int, u32, u32);

 static u32
 read_vco(struct gf100_clk *clk, u32 dsrc)
 {
 	struct nvkm_device *device = clk->base.subdev.device;
 	u32 ssrc = nvkm_rd32(device, dsrc);
 	if (!(ssrc & 0x00000100))
 		return nvkm_clk_read(&clk->base, nv_clk_src_sppll0);
 	return nvkm_clk_read(&clk->base, nv_clk_src_sppll1);
 }

 static u32
 read_pll(struct gf100_clk *clk, u32 pll)
 {
 	struct nvkm_device *device = clk->base.subdev.device;
 	u32 ctrl = nvkm_rd32(device, pll + 0x00);
 	u32 coef = nvkm_rd32(device, pll + 0x04);
 	u32 P = (coef & 0x003f0000) >> 16;
 	u32 N = (coef & 0x0000ff00) >> 8;
 	u32 M = (coef & 0x000000ff) >> 0;
 	u32 sclk;

 	if (!(ctrl & 0x00000001))
 		return 0;

 	switch (pll) {
 	case 0x00e800:
 	case 0x00e820:
 		sclk = device->crystal;
 		P = 1;
 		break;
 	case 0x132000:
 		sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrc);
 		break;
 	case 0x132020:
 		sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrcref);
 		break;
 	case 0x137000:
 	case 0x137020:
 	case 0x137040:
 	case 0x1370e0:
 		sclk = read_div(clk, (pll & 0xff) / 0x20, 0x137120, 0x137140);
 		break;
 	default:
 		return 0;
 	}

 	return sclk * N / M / P;
 }

 static u32
 read_div(struct gf100_clk *clk, int doff, u32 dsrc, u32 dctl)
 {
 	struct nvkm_device *device = clk->base.subdev.device;
 	u32 ssrc = nvkm_rd32(device, dsrc + (doff * 4));
 	u32 sctl = nvkm_rd32(device, dctl + (doff * 4));

 	switch (ssrc & 0x00000003) {
 	case 0:
 		if ((ssrc & 0x00030000) != 0x00030000)
 			return device->crystal;
 		return 108000;
 	case 2:
 		return 100000;
 	case 3:
 		if (sctl & 0x80000000) {
 			u32 sclk = read_vco(clk, dsrc + (doff * 4));
 			u32 sdiv = (sctl & 0x0000003f) + 2;
 			return (sclk * 2) / sdiv;
 		}

 		return read_vco(clk, dsrc + (doff * 4));
 	default:
 		return 0;
 	}
 }

 static u32
 read_clk(struct gf100_clk *clk, int idx)
 {
 	struct nvkm_device *device = clk->base.subdev.device;
 	u32 sctl = nvkm_rd32(device, 0x137250 + (idx * 4));
 	u32 ssel = nvkm_rd32(device, 0x137100);
 	u32 sclk, sdiv;

 	if (ssel & (1 << idx)) {
 		if (idx < 7)
 			sclk = read_pll(clk, 0x137000 + (idx * 0x20));
 		else
 			sclk = read_pll(clk, 0x1370e0);
 		sdiv = ((sctl & 0x00003f00) >> 8) + 2;
 	} else {
 		sclk = read_div(clk, idx, 0x137160, 0x1371d0);
 		sdiv = ((sctl & 0x0000003f) >> 0) + 2;
 	}

 	if (sctl & 0x80000000)
 		return (sclk * 2) / sdiv;

 	return sclk;
 }

 static int
 gf100_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
 {
 	struct gf100_clk *clk = gf100_clk(base);
 	struct nvkm_subdev *subdev = &clk->base.subdev;
 	struct nvkm_device *device = subdev->device;

 	switch (src) {
 	case nv_clk_src_crystal:
 		return device->crystal;
 	case nv_clk_src_href:
 		return 100000;
 	case nv_clk_src_sppll0:
 		return read_pll(clk, 0x00e800);
 	case nv_clk_src_sppll1:
 		return read_pll(clk, 0x00e820);

 	case nv_clk_src_mpllsrcref:
 		return read_div(clk, 0, 0x137320, 0x137330);
 	case nv_clk_src_mpllsrc:
 		return read_pll(clk, 0x132020);
 	case nv_clk_src_mpll:
 		return read_pll(clk, 0x132000);
 	case nv_clk_src_mdiv:
 		return read_div(clk, 0, 0x137300, 0x137310);
 	case nv_clk_src_mem:
 		if (nvkm_rd32(device, 0x1373f0) & 0x00000002)
 			return nvkm_clk_read(&clk->base, nv_clk_src_mpll);
 		return nvkm_clk_read(&clk->base, nv_clk_src_mdiv);

 	case nv_clk_src_gpc:
 		return read_clk(clk, 0x00);
 	case nv_clk_src_rop:
 		return read_clk(clk, 0x01);
 	case nv_clk_src_hubk07:
 		return read_clk(clk, 0x02);
 	case nv_clk_src_hubk06:
 		return read_clk(clk, 0x07);
 	case nv_clk_src_hubk01:
 		return read_clk(clk, 0x08);
 	case nv_clk_src_copy:
 		return read_clk(clk, 0x09);
 	case nv_clk_src_pmu:
 		return read_clk(clk, 0x0c);
 	case nv_clk_src_vdec:
 		return read_clk(clk, 0x0e);
 	default:
 		nvkm_error(subdev, "invalid clock source %d\n", src);
 		return -EINVAL;
 	}
 }

 static u32
 calc_div(struct gf100_clk *clk, int idx, u32 ref, u32 freq, u32 *ddiv)
 {
 	u32 div = min((ref * 2) / freq, (u32)65);
 	if (div < 2)
 		div = 2;

 	*ddiv = div - 2;
 	return (ref * 2) / div;
 }

 static u32
 calc_src(struct gf100_clk *clk, int idx, u32 freq, u32 *dsrc, u32 *ddiv)
 {
 	u32 sclk;

 	/* use one of the fixed frequencies if possible */
 	*ddiv = 0x00000000;
 	switch (freq) {
 	case  27000:
 	case 108000:
 		*dsrc = 0x00000000;
 		if (freq == 108000)
 			*dsrc |= 0x00030000;
 		return freq;
 	case 100000:
 		*dsrc = 0x00000002;
 		return freq;
 	default:
 		*dsrc = 0x00000003;
 		break;
 	}

 	/* otherwise, calculate the closest divider */
 	sclk = read_vco(clk, 0x137160 + (idx * 4));
 	if (idx < 7)
 		sclk = calc_div(clk, idx, sclk, freq, ddiv);
 	return sclk;
 }

 static u32
 calc_pll(struct gf100_clk *clk, int idx, u32 freq, u32 *coef)
 {
 	struct nvkm_subdev *subdev = &clk->base.subdev;
 	struct nvkm_bios *bios = subdev->device->bios;
 	struct nvbios_pll limits;
 	int N, M, P, ret;

 	ret = nvbios_pll_parse(bios, 0x137000 + (idx * 0x20), &limits);
 	if (ret)
 		return 0;

 	limits.refclk = read_div(clk, idx, 0x137120, 0x137140);
 	if (!limits.refclk)
 		return 0;

 	ret = gt215_pll_calc(subdev, &limits, freq, &N, NULL, &M, &P);
 	if (ret <= 0)
 		return 0;

 	*coef = (P << 16) | (N << 8) | M;
 	return ret;
 }

 static int
 calc_clk(struct gf100_clk *clk, struct nvkm_cstate *cstate, int idx, int dom)
 {
 	struct gf100_clk_info *info = &clk->eng[idx];
 	u32 freq = cstate->domain[dom];
 	u32 src0, div0, div1D, div1P = 0;
 	u32 clk0, clk1 = 0;

 	/* invalid clock domain */
 	if (!freq)
 		return 0;

 	/* first possible path, using only dividers */
 	clk0 = calc_src(clk, idx, freq, &src0, &div0);
 	clk0 = calc_div(clk, idx, clk0, freq, &div1D);

 	/* see if we can get any closer using PLLs */
 	if (clk0 != freq && (0x00004387 & (1 << idx))) {
 		if (idx <= 7)
 			clk1 = calc_pll(clk, idx, freq, &info->coef);
 		else
 			clk1 = cstate->domain[nv_clk_src_hubk06];
 		clk1 = calc_div(clk, idx, clk1, freq, &div1P);
 	}

 	/* select the method which gets closest to target freq */
 	if (abs((int)freq - clk0) <= abs((int)freq - clk1)) {
 		info->dsrc = src0;
 		if (div0) {
 			info->ddiv |= 0x80000000;
 			info->ddiv |= div0 << 8;
 			info->ddiv |= div0;
 		}
 		if (div1D) {
 			info->mdiv |= 0x80000000;
 			info->mdiv |= div1D;
 		}
 		info->ssel = info->coef = 0;
 		info->freq = clk0;
 	} else {
 		if (div1P) {
 			info->mdiv |= 0x80000000;
 			info->mdiv |= div1P << 8;
 		}
 		info->ssel = (1 << idx);
 		info->freq = clk1;
 	}

 	return 0;
 }

 static int
 gf100_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate)
 {
 	struct gf100_clk *clk = gf100_clk(base);
 	int ret;

 	if ((ret = calc_clk(clk, cstate, 0x00, nv_clk_src_gpc)) ||
 	    (ret = calc_clk(clk, cstate, 0x01, nv_clk_src_rop)) ||
 	    (ret = calc_clk(clk, cstate, 0x02, nv_clk_src_hubk07)) ||
 	    (ret = calc_clk(clk, cstate, 0x07, nv_clk_src_hubk06)) ||
 	    (ret = calc_clk(clk, cstate, 0x08, nv_clk_src_hubk01)) ||
 	    (ret = calc_clk(clk, cstate, 0x09, nv_clk_src_copy)) ||
 	    (ret = calc_clk(clk, cstate, 0x0c, nv_clk_src_pmu)) ||
 	    (ret = calc_clk(clk, cstate, 0x0e, nv_clk_src_vdec)))
 		return ret;

 	return 0;
 }

 static void
 gf100_clk_prog_0(struct gf100_clk *clk, int idx)
 {
 	struct gf100_clk_info *info = &clk->eng[idx];
 	struct nvkm_device *device = clk->base.subdev.device;
 	if (idx < 7 && !info->ssel) {
 		nvkm_mask(device, 0x1371d0 + (idx * 0x04), 0x80003f3f, info->ddiv);
 		nvkm_wr32(device, 0x137160 + (idx * 0x04), info->dsrc);
 	}
 }

 static void
 gf100_clk_prog_1(struct gf100_clk *clk, int idx)
 {
 	struct nvkm_device *device = clk->base.subdev.device;
 	nvkm_mask(device, 0x137100, (1 << idx), 0x00000000);
 	nvkm_msec(device, 2000,
 		if (!(nvkm_rd32(device, 0x137100) & (1 << idx)))
 			break;
 	);
 }

 static void
 gf100_clk_prog_2(struct gf100_clk *clk, int idx)
 {
 	struct gf100_clk_info *info = &clk->eng[idx];
 	struct nvkm_device *device = clk->base.subdev.device;
 	const u32 addr = 0x137000 + (idx * 0x20);
 	if (idx <= 7) {
 		nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000000);
 		nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000000);
 		if (info->coef) {
 			nvkm_wr32(device, addr + 0x04, info->coef);
 			nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000001);
 			nvkm_msec(device, 2000,
 				if (nvkm_rd32(device, addr + 0x00) & 0x00020000)
 					break;
 			);
 			nvkm_mask(device, addr + 0x00, 0x00020004, 0x00000004);
 		}
 	}
 }

 static void
 gf100_clk_prog_3(struct gf100_clk *clk, int idx)
 {
 	struct gf100_clk_info *info = &clk->eng[idx];
 	struct nvkm_device *device = clk->base.subdev.device;
 	if (info->ssel) {
 		nvkm_mask(device, 0x137100, (1 << idx), info->ssel);
 		nvkm_msec(device, 2000,
 			u32 tmp = nvkm_rd32(device, 0x137100) & (1 << idx);
 			if (tmp == info->ssel)
 				break;
 		);
 	}
 }

 static void
 gf100_clk_prog_4(struct gf100_clk *clk, int idx)
 {
 	struct gf100_clk_info *info = &clk->eng[idx];
 	struct nvkm_device *device = clk->base.subdev.device;
 	nvkm_mask(device, 0x137250 + (idx * 0x04), 0x00003f3f, info->mdiv);
 }

 static int
 gf100_clk_prog(struct nvkm_clk *base)
 {
 	struct gf100_clk *clk = gf100_clk(base);
 	struct {
 		void (*exec)(struct gf100_clk *, int);
 	} stage[] = {
 		{ gf100_clk_prog_0 }, /* div programming */
 		{ gf100_clk_prog_1 }, /* select div mode */
 		{ gf100_clk_prog_2 }, /* (maybe) program pll */
 		{ gf100_clk_prog_3 }, /* (maybe) select pll mode */
 		{ gf100_clk_prog_4 }, /* final divider */
 	};
 	int i, j;

 	for (i = 0; i < ARRAY_SIZE(stage); i++) {
 		for (j = 0; j < ARRAY_SIZE(clk->eng); j++) {
 			if (!clk->eng[j].freq)
 				continue;
 			stage[i].exec(clk, j);
 		}
 	}

 	return 0;
 }

 static void
 gf100_clk_tidy(struct nvkm_clk *base)
 {
 	struct gf100_clk *clk = gf100_clk(base);
 	memset(clk->eng, 0x00, sizeof(clk->eng));
 }

 static const struct nvkm_clk_func
 gf100_clk = {
 	.read = gf100_clk_read,
 	.calc = gf100_clk_calc,
 	.prog = gf100_clk_prog,
 	.tidy = gf100_clk_tidy,
 	.domains = {
 		{ nv_clk_src_crystal, 0xff },
 		{ nv_clk_src_href   , 0xff },
 		{ nv_clk_src_hubk06 , 0x00 },
 		{ nv_clk_src_hubk01 , 0x01 },
 		{ nv_clk_src_copy   , 0x02 },
 		{ nv_clk_src_gpc    , 0x03, 0, "core", 2000 },
 		{ nv_clk_src_rop    , 0x04 },
 		{ nv_clk_src_mem    , 0x05, 0, "memory", 1000 },
 		{ nv_clk_src_vdec   , 0x06 },
 		{ nv_clk_src_pmu    , 0x0a },
 		{ nv_clk_src_hubk07 , 0x0b },
 		{ nv_clk_src_max }
 	}
 };

 int
 gf100_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
 {
 	struct gf100_clk *clk;

 	if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
 		return -ENOMEM;
 	*pclk = &clk->base;

 	return nvkm_clk_ctor(&gf100_clk, device, index, false, &clk->base);
 }
	/*
	* Copyright 2012 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
	*/
	#define gf100_clk(p) container_of((p), struct gf100_clk, base)
	#include "priv.h"
	#include "pll.h"

	#include <subdev/bios.h>
	#include <subdev/bios/pll.h>
	#include <subdev/timer.h>

	struct gf100_clk_info {
	u32 freq;
	u32 ssel;
	u32 mdiv;
	u32 dsrc;
	u32 ddiv;
	u32 coef;
	};

	struct gf100_clk {
	struct nvkm_clk base;
	struct gf100_clk_info eng[16];
	};

	static u32 read_div(struct gf100_clk *, int, u32, u32);

	static u32
	read_vco(struct gf100_clk *clk, u32 dsrc)
	{
	struct nvkm_device *device = clk->base.subdev.device;
	u32 ssrc = nvkm_rd32(device, dsrc);
	if (!(ssrc & 0x00000100))
	return nvkm_clk_read(&clk->base, nv_clk_src_sppll0);
	return nvkm_clk_read(&clk->base, nv_clk_src_sppll1);
	}

	static u32
	read_pll(struct gf100_clk *clk, u32 pll)
	{
	struct nvkm_device *device = clk->base.subdev.device;
	u32 ctrl = nvkm_rd32(device, pll + 0x00);
	u32 coef = nvkm_rd32(device, pll + 0x04);
	u32 P = (coef & 0x003f0000) >> 16;
	u32 N = (coef & 0x0000ff00) >> 8;
	u32 M = (coef & 0x000000ff) >> 0;
	u32 sclk;

	if (!(ctrl & 0x00000001))
	return 0;

	switch (pll) {
	case 0x00e800:
	case 0x00e820:
	sclk = device->crystal;
	P = 1;
	break;
	case 0x132000:
	sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrc);
	break;
	case 0x132020:
	sclk = nvkm_clk_read(&clk->base, nv_clk_src_mpllsrcref);
	break;
	case 0x137000:
	case 0x137020:
	case 0x137040:
	case 0x1370e0:
	sclk = read_div(clk, (pll & 0xff) / 0x20, 0x137120, 0x137140);
	break;
	default:
	return 0;
	}

	return sclk * N / M / P;
	}

	static u32
	read_div(struct gf100_clk *clk, int doff, u32 dsrc, u32 dctl)
	{
	struct nvkm_device *device = clk->base.subdev.device;
	u32 ssrc = nvkm_rd32(device, dsrc + (doff * 4));
	u32 sctl = nvkm_rd32(device, dctl + (doff * 4));

	switch (ssrc & 0x00000003) {
	case 0:
	if ((ssrc & 0x00030000) != 0x00030000)
	return device->crystal;
	return 108000;
	case 2:
	return 100000;
	case 3:
	if (sctl & 0x80000000) {
	u32 sclk = read_vco(clk, dsrc + (doff * 4));
	u32 sdiv = (sctl & 0x0000003f) + 2;
	return (sclk * 2) / sdiv;
	}

	return read_vco(clk, dsrc + (doff * 4));
	default:
	return 0;
	}
	}

	static u32
	read_clk(struct gf100_clk *clk, int idx)
	{
	struct nvkm_device *device = clk->base.subdev.device;
	u32 sctl = nvkm_rd32(device, 0x137250 + (idx * 4));
	u32 ssel = nvkm_rd32(device, 0x137100);
	u32 sclk, sdiv;

	if (ssel & (1 << idx)) {
	if (idx < 7)
	sclk = read_pll(clk, 0x137000 + (idx * 0x20));
	else
	sclk = read_pll(clk, 0x1370e0);
	sdiv = ((sctl & 0x00003f00) >> 8) + 2;
	} else {
	sclk = read_div(clk, idx, 0x137160, 0x1371d0);
	sdiv = ((sctl & 0x0000003f) >> 0) + 2;
	}

	if (sctl & 0x80000000)
	return (sclk * 2) / sdiv;

	return sclk;
	}

	static int
	gf100_clk_read(struct nvkm_clk *base, enum nv_clk_src src)
	{
	struct gf100_clk *clk = gf100_clk(base);
	struct nvkm_subdev *subdev = &clk->base.subdev;
	struct nvkm_device *device = subdev->device;

	switch (src) {
	case nv_clk_src_crystal:
	return device->crystal;
	case nv_clk_src_href:
	return 100000;
	case nv_clk_src_sppll0:
	return read_pll(clk, 0x00e800);
	case nv_clk_src_sppll1:
	return read_pll(clk, 0x00e820);

	case nv_clk_src_mpllsrcref:
	return read_div(clk, 0, 0x137320, 0x137330);
	case nv_clk_src_mpllsrc:
	return read_pll(clk, 0x132020);
	case nv_clk_src_mpll:
	return read_pll(clk, 0x132000);
	case nv_clk_src_mdiv:
	return read_div(clk, 0, 0x137300, 0x137310);
	case nv_clk_src_mem:
	if (nvkm_rd32(device, 0x1373f0) & 0x00000002)
	return nvkm_clk_read(&clk->base, nv_clk_src_mpll);
	return nvkm_clk_read(&clk->base, nv_clk_src_mdiv);

	case nv_clk_src_gpc:
	return read_clk(clk, 0x00);
	case nv_clk_src_rop:
	return read_clk(clk, 0x01);
	case nv_clk_src_hubk07:
	return read_clk(clk, 0x02);
	case nv_clk_src_hubk06:
	return read_clk(clk, 0x07);
	case nv_clk_src_hubk01:
	return read_clk(clk, 0x08);
	case nv_clk_src_copy:
	return read_clk(clk, 0x09);
	case nv_clk_src_pmu:
	return read_clk(clk, 0x0c);
	case nv_clk_src_vdec:
	return read_clk(clk, 0x0e);
	default:
	nvkm_error(subdev, "invalid clock source %d\n", src);
	return -EINVAL;
	}
	}

	static u32
	calc_div(struct gf100_clk clk, int idx, u32 ref, u32 freq, u32 ddiv)
	{
	u32 div = min((ref * 2) / freq, (u32)65);
	if (div < 2)
	div = 2;

	*ddiv = div - 2;
	return (ref * 2) / div;
	}

	static u32
	calc_src(struct gf100_clk clk, int idx, u32 freq, u32 dsrc, u32 *ddiv)
	{
	u32 sclk;

	/* use one of the fixed frequencies if possible */
	*ddiv = 0x00000000;
	switch (freq) {
	case 27000:
	case 108000:
	*dsrc = 0x00000000;
	if (freq == 108000)
	*dsrc \|= 0x00030000;
	return freq;
	case 100000:
	*dsrc = 0x00000002;
	return freq;
	default:
	*dsrc = 0x00000003;
	break;
	}

	/* otherwise, calculate the closest divider */
	sclk = read_vco(clk, 0x137160 + (idx * 4));
	if (idx < 7)
	sclk = calc_div(clk, idx, sclk, freq, ddiv);
	return sclk;
	}

	static u32
	calc_pll(struct gf100_clk clk, int idx, u32 freq, u32 coef)
	{
	struct nvkm_subdev *subdev = &clk->base.subdev;
	struct nvkm_bios *bios = subdev->device->bios;
	struct nvbios_pll limits;
	int N, M, P, ret;

	ret = nvbios_pll_parse(bios, 0x137000 + (idx * 0x20), &limits);
	if (ret)
	return 0;

	limits.refclk = read_div(clk, idx, 0x137120, 0x137140);
	if (!limits.refclk)
	return 0;

	ret = gt215_pll_calc(subdev, &limits, freq, &N, NULL, &M, &P);
	if (ret <= 0)
	return 0;

	*coef = (P << 16) \| (N << 8) \| M;
	return ret;
	}

	static int
	calc_clk(struct gf100_clk clk, struct nvkm_cstate cstate, int idx, int dom)
	{
	struct gf100_clk_info *info = &clk->eng[idx];
	u32 freq = cstate->domain[dom];
	u32 src0, div0, div1D, div1P = 0;
	u32 clk0, clk1 = 0;

	/* invalid clock domain */
	if (!freq)
	return 0;

	/* first possible path, using only dividers */
	clk0 = calc_src(clk, idx, freq, &src0, &div0);
	clk0 = calc_div(clk, idx, clk0, freq, &div1D);

	/* see if we can get any closer using PLLs */
	if (clk0 != freq && (0x00004387 & (1 << idx))) {
	if (idx <= 7)
	clk1 = calc_pll(clk, idx, freq, &info->coef);
	else
	clk1 = cstate->domain[nv_clk_src_hubk06];
	clk1 = calc_div(clk, idx, clk1, freq, &div1P);
	}

	/* select the method which gets closest to target freq */
	if (abs((int)freq - clk0) <= abs((int)freq - clk1)) {
	info->dsrc = src0;
	if (div0) {
	info->ddiv \|= 0x80000000;
	info->ddiv \|= div0 << 8;
	info->ddiv \|= div0;
	}
	if (div1D) {
	info->mdiv \|= 0x80000000;
	info->mdiv \|= div1D;
	}
	info->ssel = info->coef = 0;
	info->freq = clk0;
	} else {
	if (div1P) {
	info->mdiv \|= 0x80000000;
	info->mdiv \|= div1P << 8;
	}
	info->ssel = (1 << idx);
	info->freq = clk1;
	}

	return 0;
	}

	static int
	gf100_clk_calc(struct nvkm_clk base, struct nvkm_cstate cstate)
	{
	struct gf100_clk *clk = gf100_clk(base);
	int ret;

	if ((ret = calc_clk(clk, cstate, 0x00, nv_clk_src_gpc)) \|\|
	(ret = calc_clk(clk, cstate, 0x01, nv_clk_src_rop)) \|\|
	(ret = calc_clk(clk, cstate, 0x02, nv_clk_src_hubk07)) \|\|
	(ret = calc_clk(clk, cstate, 0x07, nv_clk_src_hubk06)) \|\|
	(ret = calc_clk(clk, cstate, 0x08, nv_clk_src_hubk01)) \|\|
	(ret = calc_clk(clk, cstate, 0x09, nv_clk_src_copy)) \|\|
	(ret = calc_clk(clk, cstate, 0x0c, nv_clk_src_pmu)) \|\|
	(ret = calc_clk(clk, cstate, 0x0e, nv_clk_src_vdec)))
	return ret;

	return 0;
	}

	static void
	gf100_clk_prog_0(struct gf100_clk *clk, int idx)
	{
	struct gf100_clk_info *info = &clk->eng[idx];
	struct nvkm_device *device = clk->base.subdev.device;
	if (idx < 7 && !info->ssel) {
	nvkm_mask(device, 0x1371d0 + (idx * 0x04), 0x80003f3f, info->ddiv);
	nvkm_wr32(device, 0x137160 + (idx * 0x04), info->dsrc);
	}
	}

	static void
	gf100_clk_prog_1(struct gf100_clk *clk, int idx)
	{
	struct nvkm_device *device = clk->base.subdev.device;
	nvkm_mask(device, 0x137100, (1 << idx), 0x00000000);
	nvkm_msec(device, 2000,
	if (!(nvkm_rd32(device, 0x137100) & (1 << idx)))
	break;
	);
	}

	static void
	gf100_clk_prog_2(struct gf100_clk *clk, int idx)
	{
	struct gf100_clk_info *info = &clk->eng[idx];
	struct nvkm_device *device = clk->base.subdev.device;
	const u32 addr = 0x137000 + (idx * 0x20);
	if (idx <= 7) {
	nvkm_mask(device, addr + 0x00, 0x00000004, 0x00000000);
	nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000000);
	if (info->coef) {
	nvkm_wr32(device, addr + 0x04, info->coef);
	nvkm_mask(device, addr + 0x00, 0x00000001, 0x00000001);
	nvkm_msec(device, 2000,
	if (nvkm_rd32(device, addr + 0x00) & 0x00020000)
	break;
	);
	nvkm_mask(device, addr + 0x00, 0x00020004, 0x00000004);
	}
	}
	}

	static void
	gf100_clk_prog_3(struct gf100_clk *clk, int idx)
	{
	struct gf100_clk_info *info = &clk->eng[idx];
	struct nvkm_device *device = clk->base.subdev.device;
	if (info->ssel) {
	nvkm_mask(device, 0x137100, (1 << idx), info->ssel);
	nvkm_msec(device, 2000,
	u32 tmp = nvkm_rd32(device, 0x137100) & (1 << idx);
	if (tmp == info->ssel)
	break;
	);
	}
	}

	static void
	gf100_clk_prog_4(struct gf100_clk *clk, int idx)
	{
	struct gf100_clk_info *info = &clk->eng[idx];
	struct nvkm_device *device = clk->base.subdev.device;
	nvkm_mask(device, 0x137250 + (idx * 0x04), 0x00003f3f, info->mdiv);
	}

	static int
	gf100_clk_prog(struct nvkm_clk *base)
	{
	struct gf100_clk *clk = gf100_clk(base);
	struct {
	void (exec)(struct gf100_clk , int);
	} stage[] = {
	{ gf100_clk_prog_0 }, /* div programming */
	{ gf100_clk_prog_1 }, /* select div mode */
	{ gf100_clk_prog_2 }, /* (maybe) program pll */
	{ gf100_clk_prog_3 }, /* (maybe) select pll mode */
	{ gf100_clk_prog_4 }, /* final divider */
	};
	int i, j;

	for (i = 0; i < ARRAY_SIZE(stage); i++) {
	for (j = 0; j < ARRAY_SIZE(clk->eng); j++) {
	if (!clk->eng[j].freq)
	continue;
	stage[i].exec(clk, j);
	}
	}

	return 0;
	}

	static void
	gf100_clk_tidy(struct nvkm_clk *base)
	{
	struct gf100_clk *clk = gf100_clk(base);
	memset(clk->eng, 0x00, sizeof(clk->eng));
	}

	static const struct nvkm_clk_func
	gf100_clk = {
	.read = gf100_clk_read,
	.calc = gf100_clk_calc,
	.prog = gf100_clk_prog,
	.tidy = gf100_clk_tidy,
	.domains = {
	{ nv_clk_src_crystal, 0xff },
	{ nv_clk_src_href , 0xff },
	{ nv_clk_src_hubk06 , 0x00 },
	{ nv_clk_src_hubk01 , 0x01 },
	{ nv_clk_src_copy , 0x02 },
	{ nv_clk_src_gpc , 0x03, 0, "core", 2000 },
	{ nv_clk_src_rop , 0x04 },
	{ nv_clk_src_mem , 0x05, 0, "memory", 1000 },
	{ nv_clk_src_vdec , 0x06 },
	{ nv_clk_src_pmu , 0x0a },
	{ nv_clk_src_hubk07 , 0x0b },
	{ nv_clk_src_max }
	}
	};

	int
	gf100_clk_new(struct nvkm_device device, int index, struct nvkm_clk *pclk)
	{
	struct gf100_clk *clk;

	if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL)))
	return -ENOMEM;
	*pclk = &clk->base;

	return nvkm_clk_ctor(&gf100_clk, device, index, false, &clk->base);
	}