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+/*
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+ * Copyright 2015 Martin Peres
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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+ * OTHER DEALINGS IN THE SOFTWARE.
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+ *
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+ * Authors: Martin Peres
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+ */
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+#include "priv.h"
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+
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+#include <subdev/volt.h>
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+#include <subdev/gpio.h>
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+#include <subdev/bios.h>
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+#include <subdev/bios/volt.h>
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+
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+#define gk104_volt(p) container_of((p), struct gk104_volt, base)
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+struct gk104_volt {
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+ struct nvkm_volt base;
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+ struct nvbios_volt bios;
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+};
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+
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+int
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+gk104_volt_get(struct nvkm_volt *base)
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+{
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+ struct nvbios_volt *bios = &gk104_volt(base)->bios;
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+ struct nvkm_device *device = base->subdev.device;
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+ u32 div, duty;
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+
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+ div = nvkm_rd32(device, 0x20340);
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+ duty = nvkm_rd32(device, 0x20344);
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+
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+ return bios->base + bios->pwm_range * duty / div;
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+}
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+
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+int
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+gk104_volt_set(struct nvkm_volt *base, u32 uv)
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+{
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+ struct nvbios_volt *bios = &gk104_volt(base)->bios;
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+ struct nvkm_device *device = base->subdev.device;
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+ u32 div, duty;
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+
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+ /* the blob uses this crystal frequency, let's use it too. */
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+ div = 27648000 / bios->pwm_freq;
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+ duty = (uv - bios->base) * div / bios->pwm_range;
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+
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+ nvkm_wr32(device, 0x20340, div);
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+ nvkm_wr32(device, 0x20344, 0x8000000 | duty);
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+
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+ return 0;
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+}
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+
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+static const struct nvkm_volt_func
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+gk104_volt_pwm = {
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+ .volt_get = gk104_volt_get,
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+ .volt_set = gk104_volt_set,
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+}, gk104_volt_gpio = {
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+ .vid_get = nvkm_voltgpio_get,
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+ .vid_set = nvkm_voltgpio_set,
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+};
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+
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+int
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+gk104_volt_new(struct nvkm_device *device, int index, struct nvkm_volt **pvolt)
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+{
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+ const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
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+ struct dcb_gpio_func gpio;
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+ struct nvbios_volt bios;
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+ struct gk104_volt *volt;
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+ u8 ver, hdr, cnt, len;
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+ const char *mode;
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+
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+ if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
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+ return 0;
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+
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+ if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
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+ bios.type == NVBIOS_VOLT_PWM) {
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+ volt_func = &gk104_volt_pwm;
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+ }
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+
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+ if (!(volt = kzalloc(sizeof(*volt), GFP_KERNEL)))
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+ return -ENOMEM;
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+ nvkm_volt_ctor(volt_func, device, index, &volt->base);
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+ *pvolt = &volt->base;
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+ volt->bios = bios;
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+
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+ /* now that we have a subdev, we can show an error if we found through
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+ * the voltage table that we were supposed to use the PWN mode but we
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+ * did not find the right GPIO for it.
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+ */
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+ if (bios.type == NVBIOS_VOLT_PWM && volt_func != &gk104_volt_pwm) {
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+ nvkm_error(&volt->base.subdev,
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+ "Type mismatch between the voltage table type and "
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+ "the GPIO table. Fallback to GPIO mode.\n");
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+ }
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+
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+ if (volt_func == &gk104_volt_gpio) {
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+ nvkm_voltgpio_init(&volt->base);
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+ mode = "GPIO";
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+ } else
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+ mode = "PWM";
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+
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+ nvkm_debug(&volt->base.subdev, "Using %s mode\n", mode);
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+
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+ return 0;
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+}
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Martin Peres