subdev/gpio/nv50.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 "priv.h"
0025
0026 void
0027 nv50_gpio_reset(struct nvkm_gpio *gpio, u8 match)
0028 {
0029     struct nvkm_device *device = gpio->subdev.device;
0030     struct nvkm_bios *bios = device->bios;
0031     u8 ver, len;
0032     u16 entry;
0033     int ent = -1;
0034
0035     while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
0036         static const u32 regs[] = { 0xe100, 0xe28c };
0037         u32 data = nvbios_rd32(bios, entry);
0038         u8  line =   (data & 0x0000001f);
0039         u8  func =   (data & 0x0000ff00) >> 8;
0040         u8  defs = !!(data & 0x01000000);
0041         u8  unk0 = !!(data & 0x02000000);
0042         u8  unk1 = !!(data & 0x04000000);
0043         u32 val = (unk1 << 16) | unk0;
0044         u32 reg = regs[line >> 4];
0045         u32 lsh = line & 0x0f;
0046
0047         if ( func  == DCB_GPIO_UNUSED ||
0048             (match != DCB_GPIO_UNUSED && match != func))
0049             continue;
0050
0051         nvkm_gpio_set(gpio, 0, func, line, defs);
0052
0053         nvkm_mask(device, reg, 0x00010001 << lsh, val << lsh);
0054     }
0055 }
0056
0057 static int
0058 nv50_gpio_location(int line, u32 *reg, u32 *shift)
0059 {
0060     const u32 nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
0061
0062     if (line >= 32)
0063         return -EINVAL;
0064
0065     *reg = nv50_gpio_reg[line >> 3];
0066     *shift = (line & 7) << 2;
0067     return 0;
0068 }
0069
0070 int
0071 nv50_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
0072 {
0073     struct nvkm_device *device = gpio->subdev.device;
0074     u32 reg, shift;
0075
0076     if (nv50_gpio_location(line, &reg, &shift))
0077         return -EINVAL;
0078
0079     nvkm_mask(device, reg, 3 << shift, (((dir ^ 1) << 1) | out) << shift);
0080     return 0;
0081 }
0082
0083 int
0084 nv50_gpio_sense(struct nvkm_gpio *gpio, int line)
0085 {
0086     struct nvkm_device *device = gpio->subdev.device;
0087     u32 reg, shift;
0088
0089     if (nv50_gpio_location(line, &reg, &shift))
0090         return -EINVAL;
0091
0092     return !!(nvkm_rd32(device, reg) & (4 << shift));
0093 }
0094
0095 static void
0096 nv50_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
0097 {
0098     struct nvkm_device *device = gpio->subdev.device;
0099     u32 intr = nvkm_rd32(device, 0x00e054);
0100     u32 stat = nvkm_rd32(device, 0x00e050) & intr;
0101     *lo = (stat & 0xffff0000) >> 16;
0102     *hi = (stat & 0x0000ffff);
0103     nvkm_wr32(device, 0x00e054, intr);
0104 }
0105
0106 static void
0107 nv50_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
0108 {
0109     struct nvkm_device *device = gpio->subdev.device;
0110     u32 inte = nvkm_rd32(device, 0x00e050);
0111     if (type & NVKM_GPIO_LO)
0112         inte = (inte & ~(mask << 16)) | (data << 16);
0113     if (type & NVKM_GPIO_HI)
0114         inte = (inte & ~mask) | data;
0115     nvkm_wr32(device, 0x00e050, inte);
0116 }
0117
0118 static const struct nvkm_gpio_func
0119 nv50_gpio = {
0120     .lines = 16,
0121     .intr_stat = nv50_gpio_intr_stat,
0122     .intr_mask = nv50_gpio_intr_mask,
0123     .drive = nv50_gpio_drive,
0124     .sense = nv50_gpio_sense,
0125     .reset = nv50_gpio_reset,
0126 };
0127
0128 int
0129 nv50_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
0130           struct nvkm_gpio **pgpio)
0131 {
0132     return nvkm_gpio_new_(&nv50_gpio, device, type, inst, pgpio);
0133 }