subdev/bios/gpio.c

0001 /*
0002  * Copyright 2012 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs
0023  */
0024 #include <subdev/bios.h>
0025 #include <subdev/bios/dcb.h>
0026 #include <subdev/bios/gpio.h>
0027 #include <subdev/bios/xpio.h>
0028
0029 u16
0030 dcb_gpio_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
0031 {
0032     u16 data = 0x0000;
0033     u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
0034     if (dcb) {
0035         if (*ver >= 0x30 && *hdr >= 0x0c)
0036             data = nvbios_rd16(bios, dcb + 0x0a);
0037         else
0038         if (*ver >= 0x22 && nvbios_rd08(bios, dcb - 1) >= 0x13)
0039             data = nvbios_rd16(bios, dcb - 0x0f);
0040
0041         if (data) {
0042             *ver = nvbios_rd08(bios, data + 0x00);
0043             if (*ver < 0x30) {
0044                 *hdr = 3;
0045                 *cnt = nvbios_rd08(bios, data + 0x02);
0046                 *len = nvbios_rd08(bios, data + 0x01);
0047             } else
0048             if (*ver <= 0x41) {
0049                 *hdr = nvbios_rd08(bios, data + 0x01);
0050                 *cnt = nvbios_rd08(bios, data + 0x02);
0051                 *len = nvbios_rd08(bios, data + 0x03);
0052             } else {
0053                 data = 0x0000;
0054             }
0055         }
0056     }
0057     return data;
0058 }
0059
0060 u16
0061 dcb_gpio_entry(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len)
0062 {
0063     u8  hdr, cnt, xver; /* use gpio version for xpio entry parsing */
0064     u16 gpio;
0065
0066     if (!idx--)
0067         gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
0068     else
0069         gpio = dcb_xpio_table(bios, idx, &xver, &hdr, &cnt, len);
0070
0071     if (gpio && ent < cnt)
0072         return gpio + hdr + (ent * *len);
0073
0074     return 0x0000;
0075 }
0076
0077 u16
0078 dcb_gpio_parse(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len,
0079            struct dcb_gpio_func *gpio)
0080 {
0081     u16 data = dcb_gpio_entry(bios, idx, ent, ver, len);
0082     if (data) {
0083         if (*ver < 0x40) {
0084             u16 info = nvbios_rd16(bios, data);
0085             *gpio = (struct dcb_gpio_func) {
0086                 .line = (info & 0x001f) >> 0,
0087                 .func = (info & 0x07e0) >> 5,
0088                 .log[0] = (info & 0x1800) >> 11,
0089                 .log[1] = (info & 0x6000) >> 13,
0090                 .param = !!(info & 0x8000),
0091             };
0092         } else
0093         if (*ver < 0x41) {
0094             u32 info = nvbios_rd32(bios, data);
0095             *gpio = (struct dcb_gpio_func) {
0096                 .line = (info & 0x0000001f) >> 0,
0097                 .func = (info & 0x0000ff00) >> 8,
0098                 .log[0] = (info & 0x18000000) >> 27,
0099                 .log[1] = (info & 0x60000000) >> 29,
0100                 .param = !!(info & 0x80000000),
0101             };
0102         } else {
0103             u32 info = nvbios_rd32(bios, data + 0);
0104             u8 info1 = nvbios_rd32(bios, data + 4);
0105             *gpio = (struct dcb_gpio_func) {
0106                 .line = (info & 0x0000003f) >> 0,
0107                 .func = (info & 0x0000ff00) >> 8,
0108                 .log[0] = (info1 & 0x30) >> 4,
0109                 .log[1] = (info1 & 0xc0) >> 6,
0110                 .param = !!(info & 0x80000000),
0111             };
0112         }
0113     }
0114
0115     return data;
0116 }
0117
0118 u16
0119 dcb_gpio_match(struct nvkm_bios *bios, int idx, u8 func, u8 line,
0120            u8 *ver, u8 *len, struct dcb_gpio_func *gpio)
0121 {
0122     u8  hdr, cnt, i = 0;
0123     u16 data;
0124
0125     while ((data = dcb_gpio_parse(bios, idx, i++, ver, len, gpio))) {
0126         if ((line == 0xff || line == gpio->line) &&
0127             (func == 0xff || func == gpio->func))
0128             return data;
0129     }
0130
0131     /* DCB 2.2, fixed TVDAC GPIO data */
0132     if ((data = dcb_table(bios, ver, &hdr, &cnt, len))) {
0133         if (*ver >= 0x22 && *ver < 0x30 && func == DCB_GPIO_TVDAC0) {
0134             u8 conf = nvbios_rd08(bios, data - 5);
0135             u8 addr = nvbios_rd08(bios, data - 4);
0136             if (conf & 0x01) {
0137                 *gpio = (struct dcb_gpio_func) {
0138                     .func = DCB_GPIO_TVDAC0,
0139                     .line = addr >> 4,
0140                     .log[0] = !!(conf & 0x02),
0141                     .log[1] =  !(conf & 0x02),
0142                 };
0143                 *ver = 0x00;
0144                 return data;
0145             }
0146         }
0147     }
0148
0149     return 0x0000;
0150 }