drivers/gpu/drm/nouveau/nvkm/subdev/bios/pll.c - linux - Git at Google

 /*
  * Copyright 2005-2006 Erik Waling
  * Copyright 2006 Stephane Marchesin
  * Copyright 2007-2009 Stuart Bennett
  *
  * 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 AUTHORS 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.
  */
 #include <subdev/bios.h>
 #include <subdev/bios/bit.h>
 #include <subdev/bios/bmp.h>
 #include <subdev/bios/pll.h>
 #include <subdev/vga.h>


 struct pll_mapping {
 	u8  type;
 	u32 reg;
 };

 static struct pll_mapping
 nv04_pll_mapping[] = {
 	{ PLL_CORE  , 0x680500 },
 	{ PLL_MEMORY, 0x680504 },
 	{ PLL_VPLL0 , 0x680508 },
 	{ PLL_VPLL1 , 0x680520 },
 	{}
 };

 static struct pll_mapping
 nv40_pll_mapping[] = {
 	{ PLL_CORE  , 0x004000 },
 	{ PLL_MEMORY, 0x004020 },
 	{ PLL_VPLL0 , 0x680508 },
 	{ PLL_VPLL1 , 0x680520 },
 	{}
 };

 static struct pll_mapping
 nv50_pll_mapping[] = {
 	{ PLL_CORE  , 0x004028 },
 	{ PLL_SHADER, 0x004020 },
 	{ PLL_UNK03 , 0x004000 },
 	{ PLL_MEMORY, 0x004008 },
 	{ PLL_UNK40 , 0x00e810 },
 	{ PLL_UNK41 , 0x00e818 },
 	{ PLL_UNK42 , 0x00e824 },
 	{ PLL_VPLL0 , 0x614100 },
 	{ PLL_VPLL1 , 0x614900 },
 	{}
 };

 static struct pll_mapping
 g84_pll_mapping[] = {
 	{ PLL_CORE  , 0x004028 },
 	{ PLL_SHADER, 0x004020 },
 	{ PLL_MEMORY, 0x004008 },
 	{ PLL_VDEC  , 0x004030 },
 	{ PLL_UNK41 , 0x00e818 },
 	{ PLL_VPLL0 , 0x614100 },
 	{ PLL_VPLL1 , 0x614900 },
 	{}
 };

 static u16
 pll_limits_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
 {
 	struct bit_entry bit_C;

 	if (!bit_entry(bios, 'C', &bit_C) && bit_C.length >= 10) {
 		u16 data = nvbios_rd16(bios, bit_C.offset + 8);
 		if (data) {
 			*ver = nvbios_rd08(bios, data + 0);
 			*hdr = nvbios_rd08(bios, data + 1);
 			*len = nvbios_rd08(bios, data + 2);
 			*cnt = nvbios_rd08(bios, data + 3);
 			return data;
 		}
 	}

 	if (bmp_version(bios) >= 0x0524) {
 		u16 data = nvbios_rd16(bios, bios->bmp_offset + 142);
 		if (data) {
 			*ver = nvbios_rd08(bios, data + 0);
 			*hdr = 1;
 			*cnt = 1;
 			*len = 0x18;
 			return data;
 		}
 	}

 	*ver = 0x00;
 	return 0x0000;
 }

 static struct pll_mapping *
 pll_map(struct nvkm_bios *bios)
 {
 	struct nvkm_device *device = bios->subdev.device;
 	switch (device->card_type) {
 	case NV_04:
 	case NV_10:
 	case NV_11:
 	case NV_20:
 	case NV_30:
 		return nv04_pll_mapping;
 		break;
 	case NV_40:
 		return nv40_pll_mapping;
 	case NV_50:
 		if (device->chipset == 0x50)
 			return nv50_pll_mapping;
 		else
 		if (device->chipset <  0xa3 ||
 		    device->chipset == 0xaa ||
 		    device->chipset == 0xac)
 			return g84_pll_mapping;
 	default:
 		return NULL;
 	}
 }

 static u16
 pll_map_reg(struct nvkm_bios *bios, u32 reg, u32 *type, u8 *ver, u8 *len)
 {
 	struct pll_mapping *map;
 	u8  hdr, cnt;
 	u16 data;

 	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
 	if (data && *ver >= 0x30) {
 		data += hdr;
 		while (cnt--) {
 			if (nvbios_rd32(bios, data + 3) == reg) {
 				*type = nvbios_rd08(bios, data + 0);
 				return data;
 			}
 			data += *len;
 		}
 		return 0x0000;
 	}

 	map = pll_map(bios);
 	while (map->reg) {
 		if (map->reg == reg && *ver >= 0x20) {
 			u16 addr = (data += hdr);
 			*type = map->type;
 			while (cnt--) {
 				if (nvbios_rd32(bios, data) == map->reg)
 					return data;
 				data += *len;
 			}
 			return addr;
 		} else
 		if (map->reg == reg) {
 			*type = map->type;
 			return data + 1;
 		}
 		map++;
 	}

 	return 0x0000;
 }

 static u16
 pll_map_type(struct nvkm_bios *bios, u8 type, u32 *reg, u8 *ver, u8 *len)
 {
 	struct pll_mapping *map;
 	u8  hdr, cnt;
 	u16 data;

 	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
 	if (data && *ver >= 0x30) {
 		data += hdr;
 		while (cnt--) {
 			if (nvbios_rd08(bios, data + 0) == type) {
 				*reg = nvbios_rd32(bios, data + 3);
 				return data;
 			}
 			data += *len;
 		}
 		return 0x0000;
 	}

 	map = pll_map(bios);
 	while (map->reg) {
 		if (map->type == type && *ver >= 0x20) {
 			u16 addr = (data += hdr);
 			*reg = map->reg;
 			while (cnt--) {
 				if (nvbios_rd32(bios, data) == map->reg)
 					return data;
 				data += *len;
 			}
 			return addr;
 		} else
 		if (map->type == type) {
 			*reg = map->reg;
 			return data + 1;
 		}
 		map++;
 	}

 	return 0x0000;
 }

 int
 nvbios_pll_parse(struct nvkm_bios *bios, u32 type, struct nvbios_pll *info)
 {
 	struct nvkm_subdev *subdev = &bios->subdev;
 	struct nvkm_device *device = subdev->device;
 	u8  ver, len;
 	u32 reg = type;
 	u16 data;

 	if (type > PLL_MAX) {
 		reg  = type;
 		data = pll_map_reg(bios, reg, &type, &ver, &len);
 	} else {
 		data = pll_map_type(bios, type, &reg, &ver, &len);
 	}

 	if (ver && !data)
 		return -ENOENT;

 	memset(info, 0, sizeof(*info));
 	info->type = type;
 	info->reg = reg;

 	switch (ver) {
 	case 0x00:
 		break;
 	case 0x10:
 	case 0x11:
 		info->vco1.min_freq = nvbios_rd32(bios, data + 0);
 		info->vco1.max_freq = nvbios_rd32(bios, data + 4);
 		info->vco2.min_freq = nvbios_rd32(bios, data + 8);
 		info->vco2.max_freq = nvbios_rd32(bios, data + 12);
 		info->vco1.min_inputfreq = nvbios_rd32(bios, data + 16);
 		info->vco2.min_inputfreq = nvbios_rd32(bios, data + 20);
 		info->vco1.max_inputfreq = INT_MAX;
 		info->vco2.max_inputfreq = INT_MAX;

 		info->max_p = 0x7;
 		info->max_p_usable = 0x6;

 		/* these values taken from nv30/31/36 */
 		switch (bios->version.chip) {
 		case 0x36:
 			info->vco1.min_n = 0x5;
 			break;
 		default:
 			info->vco1.min_n = 0x1;
 			break;
 		}
 		info->vco1.max_n = 0xff;
 		info->vco1.min_m = 0x1;
 		info->vco1.max_m = 0xd;

 		/*
 		 * On nv30, 31, 36 (i.e. all cards with two stage PLLs with this
 		 * table version (apart from nv35)), N2 is compared to
 		 * maxN2 (0x46) and 10 * maxM2 (0x4), so set maxN2 to 0x28 and
 		 * save a comparison
 		 */
 		info->vco2.min_n = 0x4;
 		switch (bios->version.chip) {
 		case 0x30:
 		case 0x35:
 			info->vco2.max_n = 0x1f;
 			break;
 		default:
 			info->vco2.max_n = 0x28;
 			break;
 		}
 		info->vco2.min_m = 0x1;
 		info->vco2.max_m = 0x4;
 		break;
 	case 0x20:
 	case 0x21:
 		info->vco1.min_freq = nvbios_rd16(bios, data + 4) * 1000;
 		info->vco1.max_freq = nvbios_rd16(bios, data + 6) * 1000;
 		info->vco2.min_freq = nvbios_rd16(bios, data + 8) * 1000;
 		info->vco2.max_freq = nvbios_rd16(bios, data + 10) * 1000;
 		info->vco1.min_inputfreq = nvbios_rd16(bios, data + 12) * 1000;
 		info->vco2.min_inputfreq = nvbios_rd16(bios, data + 14) * 1000;
 		info->vco1.max_inputfreq = nvbios_rd16(bios, data + 16) * 1000;
 		info->vco2.max_inputfreq = nvbios_rd16(bios, data + 18) * 1000;
 		info->vco1.min_n = nvbios_rd08(bios, data + 20);
 		info->vco1.max_n = nvbios_rd08(bios, data + 21);
 		info->vco1.min_m = nvbios_rd08(bios, data + 22);
 		info->vco1.max_m = nvbios_rd08(bios, data + 23);
 		info->vco2.min_n = nvbios_rd08(bios, data + 24);
 		info->vco2.max_n = nvbios_rd08(bios, data + 25);
 		info->vco2.min_m = nvbios_rd08(bios, data + 26);
 		info->vco2.max_m = nvbios_rd08(bios, data + 27);

 		info->max_p = nvbios_rd08(bios, data + 29);
 		info->max_p_usable = info->max_p;
 		if (bios->version.chip < 0x60)
 			info->max_p_usable = 0x6;
 		info->bias_p = nvbios_rd08(bios, data + 30);

 		if (len > 0x22)
 			info->refclk = nvbios_rd32(bios, data + 31);
 		break;
 	case 0x30:
 		data = nvbios_rd16(bios, data + 1);

 		info->vco1.min_freq = nvbios_rd16(bios, data + 0) * 1000;
 		info->vco1.max_freq = nvbios_rd16(bios, data + 2) * 1000;
 		info->vco2.min_freq = nvbios_rd16(bios, data + 4) * 1000;
 		info->vco2.max_freq = nvbios_rd16(bios, data + 6) * 1000;
 		info->vco1.min_inputfreq = nvbios_rd16(bios, data + 8) * 1000;
 		info->vco2.min_inputfreq = nvbios_rd16(bios, data + 10) * 1000;
 		info->vco1.max_inputfreq = nvbios_rd16(bios, data + 12) * 1000;
 		info->vco2.max_inputfreq = nvbios_rd16(bios, data + 14) * 1000;
 		info->vco1.min_n = nvbios_rd08(bios, data + 16);
 		info->vco1.max_n = nvbios_rd08(bios, data + 17);
 		info->vco1.min_m = nvbios_rd08(bios, data + 18);
 		info->vco1.max_m = nvbios_rd08(bios, data + 19);
 		info->vco2.min_n = nvbios_rd08(bios, data + 20);
 		info->vco2.max_n = nvbios_rd08(bios, data + 21);
 		info->vco2.min_m = nvbios_rd08(bios, data + 22);
 		info->vco2.max_m = nvbios_rd08(bios, data + 23);
 		info->max_p_usable = info->max_p = nvbios_rd08(bios, data + 25);
 		info->bias_p = nvbios_rd08(bios, data + 27);
 		info->refclk = nvbios_rd32(bios, data + 28);
 		break;
 	case 0x40:
 		info->refclk = nvbios_rd16(bios, data + 9) * 1000;
 		data = nvbios_rd16(bios, data + 1);

 		info->vco1.min_freq = nvbios_rd16(bios, data + 0) * 1000;
 		info->vco1.max_freq = nvbios_rd16(bios, data + 2) * 1000;
 		info->vco1.min_inputfreq = nvbios_rd16(bios, data + 4) * 1000;
 		info->vco1.max_inputfreq = nvbios_rd16(bios, data + 6) * 1000;
 		info->vco1.min_m = nvbios_rd08(bios, data + 8);
 		info->vco1.max_m = nvbios_rd08(bios, data + 9);
 		info->vco1.min_n = nvbios_rd08(bios, data + 10);
 		info->vco1.max_n = nvbios_rd08(bios, data + 11);
 		info->min_p = nvbios_rd08(bios, data + 12);
 		info->max_p = nvbios_rd08(bios, data + 13);
 		break;
 	default:
 		nvkm_error(subdev, "unknown pll limits version 0x%02x\n", ver);
 		return -EINVAL;
 	}

 	if (!info->refclk) {
 		info->refclk = device->crystal;
 		if (bios->version.chip == 0x51) {
 			u32 sel_clk = nvkm_rd32(device, 0x680524);
 			if ((info->reg == 0x680508 && sel_clk & 0x20) ||
 			    (info->reg == 0x680520 && sel_clk & 0x80)) {
 				if (nvkm_rdvgac(device, 0, 0x27) < 0xa3)
 					info->refclk = 200000;
 				else
 					info->refclk = 25000;
 			}
 		}
 	}

 	/*
 	 * By now any valid limit table ought to have set a max frequency for
 	 * vco1, so if it's zero it's either a pre limit table bios, or one
 	 * with an empty limit table (seen on nv18)
 	 */
 	if (!info->vco1.max_freq) {
 		info->vco1.max_freq = nvbios_rd32(bios, bios->bmp_offset + 67);
 		info->vco1.min_freq = nvbios_rd32(bios, bios->bmp_offset + 71);
 		if (bmp_version(bios) < 0x0506) {
 			info->vco1.max_freq = 256000;
 			info->vco1.min_freq = 128000;
 		}

 		info->vco1.min_inputfreq = 0;
 		info->vco1.max_inputfreq = INT_MAX;
 		info->vco1.min_n = 0x1;
 		info->vco1.max_n = 0xff;
 		info->vco1.min_m = 0x1;

 		if (device->crystal == 13500) {
 			/* nv05 does this, nv11 doesn't, nv10 unknown */
 			if (bios->version.chip < 0x11)
 				info->vco1.min_m = 0x7;
 			info->vco1.max_m = 0xd;
 		} else {
 			if (bios->version.chip < 0x11)
 				info->vco1.min_m = 0x8;
 			info->vco1.max_m = 0xe;
 		}

 		if (bios->version.chip <  0x17 ||
 		    bios->version.chip == 0x1a ||
 		    bios->version.chip == 0x20)
 			info->max_p = 4;
 		else
 			info->max_p = 5;
 		info->max_p_usable = info->max_p;
 	}

 	return 0;
 }
	/*
	* Copyright 2005-2006 Erik Waling
	* Copyright 2006 Stephane Marchesin
	* Copyright 2007-2009 Stuart Bennett
	*
	* 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 AUTHORS 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.
	*/
	#include <subdev/bios.h>
	#include <subdev/bios/bit.h>
	#include <subdev/bios/bmp.h>
	#include <subdev/bios/pll.h>
	#include <subdev/vga.h>


	struct pll_mapping {
	u8 type;
	u32 reg;
	};

	static struct pll_mapping
	nv04_pll_mapping[] = {
	{ PLL_CORE , 0x680500 },
	{ PLL_MEMORY, 0x680504 },
	{ PLL_VPLL0 , 0x680508 },
	{ PLL_VPLL1 , 0x680520 },
	{}
	};

	static struct pll_mapping
	nv40_pll_mapping[] = {
	{ PLL_CORE , 0x004000 },
	{ PLL_MEMORY, 0x004020 },
	{ PLL_VPLL0 , 0x680508 },
	{ PLL_VPLL1 , 0x680520 },
	{}
	};

	static struct pll_mapping
	nv50_pll_mapping[] = {
	{ PLL_CORE , 0x004028 },
	{ PLL_SHADER, 0x004020 },
	{ PLL_UNK03 , 0x004000 },
	{ PLL_MEMORY, 0x004008 },
	{ PLL_UNK40 , 0x00e810 },
	{ PLL_UNK41 , 0x00e818 },
	{ PLL_UNK42 , 0x00e824 },
	{ PLL_VPLL0 , 0x614100 },
	{ PLL_VPLL1 , 0x614900 },
	{}
	};

	static struct pll_mapping
	g84_pll_mapping[] = {
	{ PLL_CORE , 0x004028 },
	{ PLL_SHADER, 0x004020 },
	{ PLL_MEMORY, 0x004008 },
	{ PLL_VDEC , 0x004030 },
	{ PLL_UNK41 , 0x00e818 },
	{ PLL_VPLL0 , 0x614100 },
	{ PLL_VPLL1 , 0x614900 },
	{}
	};

	static u16
	pll_limits_table(struct nvkm_bios bios, u8 ver, u8 hdr, u8 cnt, u8 *len)
	{
	struct bit_entry bit_C;

	if (!bit_entry(bios, 'C', &bit_C) && bit_C.length >= 10) {
	u16 data = nvbios_rd16(bios, bit_C.offset + 8);
	if (data) {
	*ver = nvbios_rd08(bios, data + 0);
	*hdr = nvbios_rd08(bios, data + 1);
	*len = nvbios_rd08(bios, data + 2);
	*cnt = nvbios_rd08(bios, data + 3);
	return data;
	}
	}

	if (bmp_version(bios) >= 0x0524) {
	u16 data = nvbios_rd16(bios, bios->bmp_offset + 142);
	if (data) {
	*ver = nvbios_rd08(bios, data + 0);
	*hdr = 1;
	*cnt = 1;
	*len = 0x18;
	return data;
	}
	}

	*ver = 0x00;
	return 0x0000;
	}

	static struct pll_mapping *
	pll_map(struct nvkm_bios *bios)
	{
	struct nvkm_device *device = bios->subdev.device;
	switch (device->card_type) {
	case NV_04:
	case NV_10:
	case NV_11:
	case NV_20:
	case NV_30:
	return nv04_pll_mapping;
	break;
	case NV_40:
	return nv40_pll_mapping;
	case NV_50:
	if (device->chipset == 0x50)
	return nv50_pll_mapping;
	else
	if (device->chipset < 0xa3 \|\|
	device->chipset == 0xaa \|\|
	device->chipset == 0xac)
	return g84_pll_mapping;
	default:
	return NULL;
	}
	}

	static u16
	pll_map_reg(struct nvkm_bios bios, u32 reg, u32 type, u8 ver, u8 len)
	{
	struct pll_mapping *map;
	u8 hdr, cnt;
	u16 data;

	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
	if (data && *ver >= 0x30) {
	data += hdr;
	while (cnt--) {
	if (nvbios_rd32(bios, data + 3) == reg) {
	*type = nvbios_rd08(bios, data + 0);
	return data;
	}
	data += *len;
	}
	return 0x0000;
	}

	map = pll_map(bios);
	while (map->reg) {
	if (map->reg == reg && *ver >= 0x20) {
	u16 addr = (data += hdr);
	*type = map->type;
	while (cnt--) {
	if (nvbios_rd32(bios, data) == map->reg)
	return data;
	data += *len;
	}
	return addr;
	} else
	if (map->reg == reg) {
	*type = map->type;
	return data + 1;
	}
	map++;
	}

	return 0x0000;
	}

	static u16
	pll_map_type(struct nvkm_bios bios, u8 type, u32 reg, u8 ver, u8 len)
	{
	struct pll_mapping *map;
	u8 hdr, cnt;
	u16 data;

	data = pll_limits_table(bios, ver, &hdr, &cnt, len);
	if (data && *ver >= 0x30) {
	data += hdr;
	while (cnt--) {
	if (nvbios_rd08(bios, data + 0) == type) {
	*reg = nvbios_rd32(bios, data + 3);
	return data;
	}
	data += *len;
	}
	return 0x0000;
	}

	map = pll_map(bios);
	while (map->reg) {
	if (map->type == type && *ver >= 0x20) {
	u16 addr = (data += hdr);
	*reg = map->reg;
	while (cnt--) {
	if (nvbios_rd32(bios, data) == map->reg)
	return data;
	data += *len;
	}
	return addr;
	} else
	if (map->type == type) {
	*reg = map->reg;
	return data + 1;
	}
	map++;
	}

	return 0x0000;
	}

	int
	nvbios_pll_parse(struct nvkm_bios bios, u32 type, struct nvbios_pll info)
	{
	struct nvkm_subdev *subdev = &bios->subdev;
	struct nvkm_device *device = subdev->device;
	u8 ver, len;
	u32 reg = type;
	u16 data;

	if (type > PLL_MAX) {
	reg = type;
	data = pll_map_reg(bios, reg, &type, &ver, &len);
	} else {
	data = pll_map_type(bios, type, &reg, &ver, &len);
	}

	if (ver && !data)
	return -ENOENT;

	memset(info, 0, sizeof(*info));
	info->type = type;
	info->reg = reg;

	switch (ver) {
	case 0x00:
	break;
	case 0x10:
	case 0x11:
	info->vco1.min_freq = nvbios_rd32(bios, data + 0);
	info->vco1.max_freq = nvbios_rd32(bios, data + 4);
	info->vco2.min_freq = nvbios_rd32(bios, data + 8);
	info->vco2.max_freq = nvbios_rd32(bios, data + 12);
	info->vco1.min_inputfreq = nvbios_rd32(bios, data + 16);
	info->vco2.min_inputfreq = nvbios_rd32(bios, data + 20);
	info->vco1.max_inputfreq = INT_MAX;
	info->vco2.max_inputfreq = INT_MAX;

	info->max_p = 0x7;
	info->max_p_usable = 0x6;

	/* these values taken from nv30/31/36 */
	switch (bios->version.chip) {
	case 0x36:
	info->vco1.min_n = 0x5;
	break;
	default:
	info->vco1.min_n = 0x1;
	break;
	}
	info->vco1.max_n = 0xff;
	info->vco1.min_m = 0x1;
	info->vco1.max_m = 0xd;

	/*
	* On nv30, 31, 36 (i.e. all cards with two stage PLLs with this
	* table version (apart from nv35)), N2 is compared to
	* maxN2 (0x46) and 10 * maxM2 (0x4), so set maxN2 to 0x28 and
	* save a comparison
	*/
	info->vco2.min_n = 0x4;
	switch (bios->version.chip) {
	case 0x30:
	case 0x35:
	info->vco2.max_n = 0x1f;
	break;
	default:
	info->vco2.max_n = 0x28;
	break;
	}
	info->vco2.min_m = 0x1;
	info->vco2.max_m = 0x4;
	break;
	case 0x20:
	case 0x21:
	info->vco1.min_freq = nvbios_rd16(bios, data + 4) * 1000;
	info->vco1.max_freq = nvbios_rd16(bios, data + 6) * 1000;
	info->vco2.min_freq = nvbios_rd16(bios, data + 8) * 1000;
	info->vco2.max_freq = nvbios_rd16(bios, data + 10) * 1000;
	info->vco1.min_inputfreq = nvbios_rd16(bios, data + 12) * 1000;
	info->vco2.min_inputfreq = nvbios_rd16(bios, data + 14) * 1000;
	info->vco1.max_inputfreq = nvbios_rd16(bios, data + 16) * 1000;
	info->vco2.max_inputfreq = nvbios_rd16(bios, data + 18) * 1000;
	info->vco1.min_n = nvbios_rd08(bios, data + 20);
	info->vco1.max_n = nvbios_rd08(bios, data + 21);
	info->vco1.min_m = nvbios_rd08(bios, data + 22);
	info->vco1.max_m = nvbios_rd08(bios, data + 23);
	info->vco2.min_n = nvbios_rd08(bios, data + 24);
	info->vco2.max_n = nvbios_rd08(bios, data + 25);
	info->vco2.min_m = nvbios_rd08(bios, data + 26);
	info->vco2.max_m = nvbios_rd08(bios, data + 27);

	info->max_p = nvbios_rd08(bios, data + 29);
	info->max_p_usable = info->max_p;
	if (bios->version.chip < 0x60)
	info->max_p_usable = 0x6;
	info->bias_p = nvbios_rd08(bios, data + 30);

	if (len > 0x22)
	info->refclk = nvbios_rd32(bios, data + 31);
	break;
	case 0x30:
	data = nvbios_rd16(bios, data + 1);

	info->vco1.min_freq = nvbios_rd16(bios, data + 0) * 1000;
	info->vco1.max_freq = nvbios_rd16(bios, data + 2) * 1000;
	info->vco2.min_freq = nvbios_rd16(bios, data + 4) * 1000;
	info->vco2.max_freq = nvbios_rd16(bios, data + 6) * 1000;
	info->vco1.min_inputfreq = nvbios_rd16(bios, data + 8) * 1000;
	info->vco2.min_inputfreq = nvbios_rd16(bios, data + 10) * 1000;
	info->vco1.max_inputfreq = nvbios_rd16(bios, data + 12) * 1000;
	info->vco2.max_inputfreq = nvbios_rd16(bios, data + 14) * 1000;
	info->vco1.min_n = nvbios_rd08(bios, data + 16);
	info->vco1.max_n = nvbios_rd08(bios, data + 17);
	info->vco1.min_m = nvbios_rd08(bios, data + 18);
	info->vco1.max_m = nvbios_rd08(bios, data + 19);
	info->vco2.min_n = nvbios_rd08(bios, data + 20);
	info->vco2.max_n = nvbios_rd08(bios, data + 21);
	info->vco2.min_m = nvbios_rd08(bios, data + 22);
	info->vco2.max_m = nvbios_rd08(bios, data + 23);
	info->max_p_usable = info->max_p = nvbios_rd08(bios, data + 25);
	info->bias_p = nvbios_rd08(bios, data + 27);
	info->refclk = nvbios_rd32(bios, data + 28);
	break;
	case 0x40:
	info->refclk = nvbios_rd16(bios, data + 9) * 1000;
	data = nvbios_rd16(bios, data + 1);

	info->vco1.min_freq = nvbios_rd16(bios, data + 0) * 1000;
	info->vco1.max_freq = nvbios_rd16(bios, data + 2) * 1000;
	info->vco1.min_inputfreq = nvbios_rd16(bios, data + 4) * 1000;
	info->vco1.max_inputfreq = nvbios_rd16(bios, data + 6) * 1000;
	info->vco1.min_m = nvbios_rd08(bios, data + 8);
	info->vco1.max_m = nvbios_rd08(bios, data + 9);
	info->vco1.min_n = nvbios_rd08(bios, data + 10);
	info->vco1.max_n = nvbios_rd08(bios, data + 11);
	info->min_p = nvbios_rd08(bios, data + 12);
	info->max_p = nvbios_rd08(bios, data + 13);
	break;
	default:
	nvkm_error(subdev, "unknown pll limits version 0x%02x\n", ver);
	return -EINVAL;
	}

	if (!info->refclk) {
	info->refclk = device->crystal;
	if (bios->version.chip == 0x51) {
	u32 sel_clk = nvkm_rd32(device, 0x680524);
	if ((info->reg == 0x680508 && sel_clk & 0x20) \|\|
	(info->reg == 0x680520 && sel_clk & 0x80)) {
	if (nvkm_rdvgac(device, 0, 0x27) < 0xa3)
	info->refclk = 200000;
	else
	info->refclk = 25000;
	}
	}
	}

	/*
	* By now any valid limit table ought to have set a max frequency for
	* vco1, so if it's zero it's either a pre limit table bios, or one
	* with an empty limit table (seen on nv18)
	*/
	if (!info->vco1.max_freq) {
	info->vco1.max_freq = nvbios_rd32(bios, bios->bmp_offset + 67);
	info->vco1.min_freq = nvbios_rd32(bios, bios->bmp_offset + 71);
	if (bmp_version(bios) < 0x0506) {
	info->vco1.max_freq = 256000;
	info->vco1.min_freq = 128000;
	}

	info->vco1.min_inputfreq = 0;
	info->vco1.max_inputfreq = INT_MAX;
	info->vco1.min_n = 0x1;
	info->vco1.max_n = 0xff;
	info->vco1.min_m = 0x1;

	if (device->crystal == 13500) {
	/* nv05 does this, nv11 doesn't, nv10 unknown */
	if (bios->version.chip < 0x11)
	info->vco1.min_m = 0x7;
	info->vco1.max_m = 0xd;
	} else {
	if (bios->version.chip < 0x11)
	info->vco1.min_m = 0x8;
	info->vco1.max_m = 0xe;
	}

	if (bios->version.chip < 0x17 \|\|
	bios->version.chip == 0x1a \|\|
	bios->version.chip == 0x20)
	info->max_p = 4;
	else
	info->max_p = 5;
	info->max_p_usable = info->max_p;
	}

	return 0;
	}