76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* Copyright 2010 Red Hat Inc.
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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: Ben Skeggs
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*/
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#include "drmP.h"
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#include "nouveau_drv.h"
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#include "nouveau_hw.h"
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static int
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nv50_gpio_location(struct dcb_gpio_entry *gpio, uint32_t *reg, uint32_t *shift)
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{
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const uint32_t nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
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if (gpio->line > 32)
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return -EINVAL;
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*reg = nv50_gpio_reg[gpio->line >> 3];
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*shift = (gpio->line & 7) << 2;
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return 0;
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}
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int
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nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
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{
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struct dcb_gpio_entry *gpio;
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uint32_t r, s, v;
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gpio = nouveau_bios_gpio_entry(dev, tag);
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if (!gpio)
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return -ENOENT;
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if (nv50_gpio_location(gpio, &r, &s))
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return -EINVAL;
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v = nv_rd32(dev, r) >> (s + 2);
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return ((v & 1) == (gpio->state[1] & 1));
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}
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int
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nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
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{
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struct dcb_gpio_entry *gpio;
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uint32_t r, s, v;
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gpio = nouveau_bios_gpio_entry(dev, tag);
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if (!gpio)
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return -ENOENT;
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if (nv50_gpio_location(gpio, &r, &s))
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return -EINVAL;
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v = nv_rd32(dev, r) & ~(0x3 << s);
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v |= (gpio->state[state] ^ 2) << s;
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nv_wr32(dev, r, v);
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return 0;
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}
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