diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c new file mode 100644 index 000000000000..ed838130c89d --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/nv40.c @@ -0,0 +1,241 @@ +/* + * 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 + */ +#include <subdev/clk.h> +#include "pll.h" + +#include <core/device.h> +#include <subdev/bios.h> +#include <subdev/bios/pll.h> + +struct nv40_clk_priv { + struct nvkm_clk base; + u32 ctrl; + u32 npll_ctrl; + u32 npll_coef; + u32 spll; +}; + +static struct nvkm_domain +nv40_domain[] = { + { nv_clk_src_crystal, 0xff }, + { nv_clk_src_href , 0xff }, + { nv_clk_src_core , 0xff, 0, "core", 1000 }, + { nv_clk_src_shader , 0xff, 0, "shader", 1000 }, + { nv_clk_src_mem , 0xff, 0, "memory", 1000 }, + { nv_clk_src_max } +}; + +static u32 +read_pll_1(struct nv40_clk_priv *priv, u32 reg) +{ + u32 ctrl = nv_rd32(priv, reg + 0x00); + int P = (ctrl & 0x00070000) >> 16; + int N = (ctrl & 0x0000ff00) >> 8; + int M = (ctrl & 0x000000ff) >> 0; + u32 ref = 27000, clk = 0; + + if (ctrl & 0x80000000) + clk = ref * N / M; + + return clk >> P; +} + +static u32 +read_pll_2(struct nv40_clk_priv *priv, u32 reg) +{ + u32 ctrl = nv_rd32(priv, reg + 0x00); + u32 coef = nv_rd32(priv, reg + 0x04); + int N2 = (coef & 0xff000000) >> 24; + int M2 = (coef & 0x00ff0000) >> 16; + int N1 = (coef & 0x0000ff00) >> 8; + int M1 = (coef & 0x000000ff) >> 0; + int P = (ctrl & 0x00070000) >> 16; + u32 ref = 27000, clk = 0; + + if ((ctrl & 0x80000000) && M1) { + clk = ref * N1 / M1; + if ((ctrl & 0x40000100) == 0x40000000) { + if (M2) + clk = clk * N2 / M2; + else + clk = 0; + } + } + + return clk >> P; +} + +static u32 +read_clk(struct nv40_clk_priv *priv, u32 src) +{ + switch (src) { + case 3: + return read_pll_2(priv, 0x004000); + case 2: + return read_pll_1(priv, 0x004008); + default: + break; + } + + return 0; +} + +static int +nv40_clk_read(struct nvkm_clk *clk, enum nv_clk_src src) +{ + struct nv40_clk_priv *priv = (void *)clk; + u32 mast = nv_rd32(priv, 0x00c040); + + switch (src) { + case nv_clk_src_crystal: + return nv_device(priv)->crystal; + case nv_clk_src_href: + return 100000; /*XXX: PCIE/AGP differ*/ + case nv_clk_src_core: + return read_clk(priv, (mast & 0x00000003) >> 0); + case nv_clk_src_shader: + return read_clk(priv, (mast & 0x00000030) >> 4); + case nv_clk_src_mem: + return read_pll_2(priv, 0x4020); + default: + break; + } + + nv_debug(priv, "unknown clock source %d 0x%08x\n", src, mast); + return -EINVAL; +} + +static int +nv40_clk_calc_pll(struct nv40_clk_priv *priv, u32 reg, u32 clk, + int *N1, int *M1, int *N2, int *M2, int *log2P) +{ + struct nvkm_bios *bios = nvkm_bios(priv); + struct nvbios_pll pll; + int ret; + + ret = nvbios_pll_parse(bios, reg, &pll); + if (ret) + return ret; + + if (clk < pll.vco1.max_freq) + pll.vco2.max_freq = 0; + + ret = nv04_pll_calc(nv_subdev(priv), &pll, clk, N1, M1, N2, M2, log2P); + if (ret == 0) + return -ERANGE; + + return ret; +} + +static int +nv40_clk_calc(struct nvkm_clk *clk, struct nvkm_cstate *cstate) +{ + struct nv40_clk_priv *priv = (void *)clk; + int gclk = cstate->domain[nv_clk_src_core]; + int sclk = cstate->domain[nv_clk_src_shader]; + int N1, M1, N2, M2, log2P; + int ret; + + /* core/geometric clock */ + ret = nv40_clk_calc_pll(priv, 0x004000, gclk, + &N1, &M1, &N2, &M2, &log2P); + if (ret < 0) + return ret; + + if (N2 == M2) { + priv->npll_ctrl = 0x80000100 | (log2P << 16); + priv->npll_coef = (N1 << 8) | M1; + } else { + priv->npll_ctrl = 0xc0000000 | (log2P << 16); + priv->npll_coef = (N2 << 24) | (M2 << 16) | (N1 << 8) | M1; + } + + /* use the second pll for shader/rop clock, if it differs from core */ + if (sclk && sclk != gclk) { + ret = nv40_clk_calc_pll(priv, 0x004008, sclk, + &N1, &M1, NULL, NULL, &log2P); + if (ret < 0) + return ret; + + priv->spll = 0xc0000000 | (log2P << 16) | (N1 << 8) | M1; + priv->ctrl = 0x00000223; + } else { + priv->spll = 0x00000000; + priv->ctrl = 0x00000333; + } + + return 0; +} + +static int +nv40_clk_prog(struct nvkm_clk *clk) +{ + struct nv40_clk_priv *priv = (void *)clk; + nv_mask(priv, 0x00c040, 0x00000333, 0x00000000); + nv_wr32(priv, 0x004004, priv->npll_coef); + nv_mask(priv, 0x004000, 0xc0070100, priv->npll_ctrl); + nv_mask(priv, 0x004008, 0xc007ffff, priv->spll); + mdelay(5); + nv_mask(priv, 0x00c040, 0x00000333, priv->ctrl); + return 0; +} + +static void +nv40_clk_tidy(struct nvkm_clk *clk) +{ +} + +static int +nv40_clk_ctor(struct nvkm_object *parent, struct nvkm_object *engine, + struct nvkm_oclass *oclass, void *data, u32 size, + struct nvkm_object **pobject) +{ + struct nv40_clk_priv *priv; + int ret; + + ret = nvkm_clk_create(parent, engine, oclass, nv40_domain, + NULL, 0, true, &priv); + *pobject = nv_object(priv); + if (ret) + return ret; + + priv->base.pll_calc = nv04_clk_pll_calc; + priv->base.pll_prog = nv04_clk_pll_prog; + priv->base.read = nv40_clk_read; + priv->base.calc = nv40_clk_calc; + priv->base.prog = nv40_clk_prog; + priv->base.tidy = nv40_clk_tidy; + return 0; +} + +struct nvkm_oclass +nv40_clk_oclass = { + .handle = NV_SUBDEV(CLK, 0x40), + .ofuncs = &(struct nvkm_ofuncs) { + .ctor = nv40_clk_ctor, + .dtor = _nvkm_clk_dtor, + .init = _nvkm_clk_init, + .fini = _nvkm_clk_fini, + }, +}; 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