1/* $NetBSD: nouveau_nvkm_subdev_bios_xpio.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */ 2 3/* 4 * Copyright 2012 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs 25 */ 26#include <sys/cdefs.h> 27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_xpio.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $"); 28 29#include <subdev/bios.h> 30#include <subdev/bios/gpio.h> 31#include <subdev/bios/xpio.h> 32 33static u16 34dcb_xpiod_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 35{ 36 u16 data = dcb_gpio_table(bios, ver, hdr, cnt, len); 37 if (data && *ver >= 0x40 && *hdr >= 0x06) { 38 u16 xpio = nvbios_rd16(bios, data + 0x04); 39 if (xpio) { 40 *ver = nvbios_rd08(bios, data + 0x00); 41 *hdr = nvbios_rd08(bios, data + 0x01); 42 *cnt = nvbios_rd08(bios, data + 0x02); 43 *len = nvbios_rd08(bios, data + 0x03); 44 return xpio; 45 } 46 } 47 return 0x0000; 48} 49 50u16 51dcb_xpio_table(struct nvkm_bios *bios, u8 idx, 52 u8 *ver, u8 *hdr, u8 *cnt, u8 *len) 53{ 54 u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len); 55 if (data && idx < *cnt) { 56 u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len)); 57 if (xpio) { 58 *ver = nvbios_rd08(bios, data + 0x00); 59 *hdr = nvbios_rd08(bios, data + 0x01); 60 *cnt = nvbios_rd08(bios, data + 0x02); 61 *len = nvbios_rd08(bios, data + 0x03); 62 return xpio; 63 } 64 } 65 return 0x0000; 66} 67 68u16 69dcb_xpio_parse(struct nvkm_bios *bios, u8 idx, 70 u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info) 71{ 72 u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len); 73 if (data && *len >= 6) { 74 info->type = nvbios_rd08(bios, data + 0x04); 75 info->addr = nvbios_rd08(bios, data + 0x05); 76 info->flags = nvbios_rd08(bios, data + 0x06); 77 } 78 return 0x0000; 79} 80