Home | History | Annotate | Line # | Download | only in bios 
      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_gpio.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_gpio.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/dcb.h>
     31 #include <subdev/bios/gpio.h>
     32 #include <subdev/bios/xpio.h>
     33 
     34 u16
     35 dcb_gpio_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     36 {
     37 	u16 data = 0x0000;
     38 	u16 dcb = dcb_table(bios, ver, hdr, cnt, len);
     39 	if (dcb) {
     40 		if (*ver >= 0x30 && *hdr >= 0x0c)
     41 			data = nvbios_rd16(bios, dcb + 0x0a);
     42 		else
     43 		if (*ver >= 0x22 && nvbios_rd08(bios, dcb - 1) >= 0x13)
     44 			data = nvbios_rd16(bios, dcb - 0x0f);
     45 
     46 		if (data) {
     47 			*ver = nvbios_rd08(bios, data + 0x00);
     48 			if (*ver < 0x30) {
     49 				*hdr = 3;
     50 				*cnt = nvbios_rd08(bios, data + 0x02);
     51 				*len = nvbios_rd08(bios, data + 0x01);
     52 			} else
     53 			if (*ver <= 0x41) {
     54 				*hdr = nvbios_rd08(bios, data + 0x01);
     55 				*cnt = nvbios_rd08(bios, data + 0x02);
     56 				*len = nvbios_rd08(bios, data + 0x03);
     57 			} else {
     58 				data = 0x0000;
     59 			}
     60 		}
     61 	}
     62 	return data;
     63 }
     64 
     65 u16
     66 dcb_gpio_entry(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len)
     67 {
     68 	u8  hdr, cnt, xver; /* use gpio version for xpio entry parsing */
     69 	u16 gpio;
     70 
     71 	if (!idx--)
     72 		gpio = dcb_gpio_table(bios, ver, &hdr, &cnt, len);
     73 	else
     74 		gpio = dcb_xpio_table(bios, idx, &xver, &hdr, &cnt, len);
     75 
     76 	if (gpio && ent < cnt)
     77 		return gpio + hdr + (ent * *len);
     78 
     79 	return 0x0000;
     80 }
     81 
     82 u16
     83 dcb_gpio_parse(struct nvkm_bios *bios, int idx, int ent, u8 *ver, u8 *len,
     84 	       struct dcb_gpio_func *gpio)
     85 {
     86 	u16 data = dcb_gpio_entry(bios, idx, ent, ver, len);
     87 	if (data) {
     88 		if (*ver < 0x40) {
     89 			u16 info = nvbios_rd16(bios, data);
     90 			*gpio = (struct dcb_gpio_func) {
     91 				.line = (info & 0x001f) >> 0,
     92 				.func = (info & 0x07e0) >> 5,
     93 				.log[0] = (info & 0x1800) >> 11,
     94 				.log[1] = (info & 0x6000) >> 13,
     95 				.param = !!(info & 0x8000),
     96 			};
     97 		} else
     98 		if (*ver < 0x41) {
     99 			u32 info = nvbios_rd32(bios, data);
    100 			*gpio = (struct dcb_gpio_func) {
    101 				.line = (info & 0x0000001f) >> 0,
    102 				.func = (info & 0x0000ff00) >> 8,
    103 				.log[0] = (info & 0x18000000) >> 27,
    104 				.log[1] = (info & 0x60000000) >> 29,
    105 				.param = !!(info & 0x80000000),
    106 			};
    107 		} else {
    108 			u32 info = nvbios_rd32(bios, data + 0);
    109 			u8 info1 = nvbios_rd32(bios, data + 4);
    110 			*gpio = (struct dcb_gpio_func) {
    111 				.line = (info & 0x0000003f) >> 0,
    112 				.func = (info & 0x0000ff00) >> 8,
    113 				.log[0] = (info1 & 0x30) >> 4,
    114 				.log[1] = (info1 & 0xc0) >> 6,
    115 				.param = !!(info & 0x80000000),
    116 			};
    117 		}
    118 	}
    119 
    120 	return data;
    121 }
    122 
    123 u16
    124 dcb_gpio_match(struct nvkm_bios *bios, int idx, u8 func, u8 line,
    125 	       u8 *ver, u8 *len, struct dcb_gpio_func *gpio)
    126 {
    127 	u8  hdr, cnt, i = 0;
    128 	u16 data;
    129 
    130 	while ((data = dcb_gpio_parse(bios, idx, i++, ver, len, gpio))) {
    131 		if ((line == 0xff || line == gpio->line) &&
    132 		    (func == 0xff || func == gpio->func))
    133 			return data;
    134 	}
    135 
    136 	/* DCB 2.2, fixed TVDAC GPIO data */
    137 	if ((data = dcb_table(bios, ver, &hdr, &cnt, len))) {
    138 		if (*ver >= 0x22 && *ver < 0x30 && func == DCB_GPIO_TVDAC0) {
    139 			u8 conf = nvbios_rd08(bios, data - 5);
    140 			u8 addr = nvbios_rd08(bios, data - 4);
    141 			if (conf & 0x01) {
    142 				*gpio = (struct dcb_gpio_func) {
    143 					.func = DCB_GPIO_TVDAC0,
    144 					.line = addr >> 4,
    145 					.log[0] = !!(conf & 0x02),
    146 					.log[1] =  !(conf & 0x02),
    147 				};
    148 				*ver = 0x00;
    149 				return data;
    150 			}
    151 		}
    152 	}
    153 
    154 	return 0x0000;
    155 }
    156