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      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 
     33 static u16
     34 dcb_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 
     50 u16
     51 dcb_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 
     68 u16
     69 dcb_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