diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c b/drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c new file mode 100644 index 0000000..718267d --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/bios/gpio.c @@ -0,0 +1,114 @@ +/* + * 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/bios.h> +#include <subdev/bios/dcb.h> +#include <subdev/bios/gpio.h> + +u16 +dcb_gpio_table(struct nouveau_bios *bios) +{ + u8 ver, hdr, cnt, len; + u16 dcb = dcb_table(bios, &ver, &hdr, &cnt, &len); + if (dcb) { + if (ver >= 0x30 && hdr >= 0x0c) + return nv_ro16(bios, dcb + 0x0a); + if (ver >= 0x22 && nv_ro08(bios, dcb - 1) >= 0x13) + return nv_ro16(bios, dcb - 0x0f); + } + return 0x0000; +} + +u16 +dcb_gpio_entry(struct nouveau_bios *bios, int idx, int ent, u8 *ver) +{ + u16 gpio = dcb_gpio_table(bios); + if (gpio) { + *ver = nv_ro08(bios, gpio); + if (*ver < 0x30 && ent < nv_ro08(bios, gpio + 2)) + return gpio + 3 + (ent * nv_ro08(bios, gpio + 1)); + else if (ent < nv_ro08(bios, gpio + 2)) + return gpio + nv_ro08(bios, gpio + 1) + + (ent * nv_ro08(bios, gpio + 3)); + } + return 0x0000; +} + +int +dcb_gpio_parse(struct nouveau_bios *bios, int idx, u8 func, u8 line, + struct dcb_gpio_func *gpio) +{ + u8 ver, hdr, cnt, len; + u16 entry; + int i = -1; + + while ((entry = dcb_gpio_entry(bios, idx, ++i, &ver))) { + if (ver < 0x40) { + u16 data = nv_ro16(bios, entry); + *gpio = (struct dcb_gpio_func) { + .line = (data & 0x001f) >> 0, + .func = (data & 0x07e0) >> 5, + .log[0] = (data & 0x1800) >> 11, + .log[1] = (data & 0x6000) >> 13, + }; + } else + if (ver < 0x41) { + u32 data = nv_ro32(bios, entry); + *gpio = (struct dcb_gpio_func) { + .line = (data & 0x0000001f) >> 0, + .func = (data & 0x0000ff00) >> 8, + .log[0] = (data & 0x18000000) >> 27, + .log[1] = (data & 0x60000000) >> 29, + }; + } else { + u32 data = nv_ro32(bios, entry + 0); + u8 data1 = nv_ro32(bios, entry + 4); + *gpio = (struct dcb_gpio_func) { + .line = (data & 0x0000003f) >> 0, + .func = (data & 0x0000ff00) >> 8, + .log[0] = (data1 & 0x30) >> 4, + .log[1] = (data1 & 0xc0) >> 6, + }; + } + + if ((line == 0xff || line == gpio->line) && + (func == 0xff || func == gpio->func)) + return 0; + } + + /* DCB 2.2, fixed TVDAC GPIO data */ + if ((entry = dcb_table(bios, &ver, &hdr, &cnt, &len)) && ver >= 0x22) { + if (func == DCB_GPIO_TVDAC0) { + *gpio = (struct dcb_gpio_func) { + .func = DCB_GPIO_TVDAC0, + .line = nv_ro08(bios, entry - 4) >> 4, + .log[0] = !!(nv_ro08(bios, entry - 5) & 2), + .log[1] = !(nv_ro08(bios, entry - 5) & 2), + }; + return 0; + } + } + + return -EINVAL; +} |