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      1 /*	$NetBSD: nouveau_nvkm_subdev_gpio_nv50.c,v 1.4 2021/12/18 23:45:39 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_gpio_nv50.c,v 1.4 2021/12/18 23:45:39 riastradh Exp $");
     28 
     29 #include "priv.h"
     30 
     31 void
     32 nv50_gpio_reset(struct nvkm_gpio *gpio, u8 match)
     33 {
     34 	struct nvkm_device *device = gpio->subdev.device;
     35 	struct nvkm_bios *bios = device->bios;
     36 	u8 ver, len;
     37 	u16 entry;
     38 	int ent = -1;
     39 
     40 	while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
     41 		static const u32 regs[] = { 0xe100, 0xe28c };
     42 		u32 data = nvbios_rd32(bios, entry);
     43 		u8  line =   (data & 0x0000001f);
     44 		u8  func =   (data & 0x0000ff00) >> 8;
     45 		u8  defs = !!(data & 0x01000000);
     46 		u8  unk0 = !!(data & 0x02000000);
     47 		u8  unk1 = !!(data & 0x04000000);
     48 		u32 val = (unk1 << 16) | unk0;
     49 		u32 reg = regs[line >> 4];
     50 		u32 lsh = line & 0x0f;
     51 
     52 		if ( func  == DCB_GPIO_UNUSED ||
     53 		    (match != DCB_GPIO_UNUSED && match != func))
     54 			continue;
     55 
     56 		nvkm_gpio_set(gpio, 0, func, line, defs);
     57 
     58 		nvkm_mask(device, reg, 0x00010001U << lsh, val << lsh);
     59 	}
     60 }
     61 
     62 static int
     63 nv50_gpio_location(int line, u32 *reg, u32 *shift)
     64 {
     65 	const u32 nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
     66 
     67 	if (line >= 32)
     68 		return -EINVAL;
     69 
     70 	*reg = nv50_gpio_reg[line >> 3];
     71 	*shift = (line & 7) << 2;
     72 	return 0;
     73 }
     74 
     75 int
     76 nv50_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
     77 {
     78 	struct nvkm_device *device = gpio->subdev.device;
     79 	u32 reg, shift;
     80 
     81 	if (nv50_gpio_location(line, &reg, &shift))
     82 		return -EINVAL;
     83 
     84 	nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
     85 	return 0;
     86 }
     87 
     88 int
     89 nv50_gpio_sense(struct nvkm_gpio *gpio, int line)
     90 {
     91 	struct nvkm_device *device = gpio->subdev.device;
     92 	u32 reg, shift;
     93 
     94 	if (nv50_gpio_location(line, &reg, &shift))
     95 		return -EINVAL;
     96 
     97 	return !!(nvkm_rd32(device, reg) & (4 << shift));
     98 }
     99 
    100 static void
    101 nv50_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
    102 {
    103 	struct nvkm_device *device = gpio->subdev.device;
    104 	u32 intr = nvkm_rd32(device, 0x00e054);
    105 	u32 stat = nvkm_rd32(device, 0x00e050) & intr;
    106 	*lo = (stat & 0xffff0000) >> 16;
    107 	*hi = (stat & 0x0000ffff);
    108 	nvkm_wr32(device, 0x00e054, intr);
    109 }
    110 
    111 static void
    112 nv50_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
    113 {
    114 	struct nvkm_device *device = gpio->subdev.device;
    115 	u32 inte = nvkm_rd32(device, 0x00e050);
    116 	if (type & NVKM_GPIO_LO)
    117 		inte = (inte & ~(mask << 16)) | (data << 16);
    118 	if (type & NVKM_GPIO_HI)
    119 		inte = (inte & ~mask) | data;
    120 	nvkm_wr32(device, 0x00e050, inte);
    121 }
    122 
    123 static const struct nvkm_gpio_func
    124 nv50_gpio = {
    125 	.lines = 16,
    126 	.intr_stat = nv50_gpio_intr_stat,
    127 	.intr_mask = nv50_gpio_intr_mask,
    128 	.drive = nv50_gpio_drive,
    129 	.sense = nv50_gpio_sense,
    130 	.reset = nv50_gpio_reset,
    131 };
    132 
    133 int
    134 nv50_gpio_new(struct nvkm_device *device, int index, struct nvkm_gpio **pgpio)
    135 {
    136 	return nvkm_gpio_new_(&nv50_gpio, device, index, pgpio);
    137 }
    138