1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 */ 24 #include "priv.h" 25 26 #include <subdev/vga.h> 27 28 struct nv04_i2c_port { 29 struct nvkm_i2c_port base; 30 u8 drive; 31 u8 sense; 32 }; 33 34 static void 35 nv04_i2c_drive_scl(struct nvkm_i2c_port *base, int state) 36 { 37 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 38 struct nv04_i2c_port *port = (void *)base; 39 u8 val = nv_rdvgac(i2c, 0, port->drive); 40 if (state) val |= 0x20; 41 else val &= 0xdf; 42 nv_wrvgac(i2c, 0, port->drive, val | 0x01); 43 } 44 45 static void 46 nv04_i2c_drive_sda(struct nvkm_i2c_port *base, int state) 47 { 48 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 49 struct nv04_i2c_port *port = (void *)base; 50 u8 val = nv_rdvgac(i2c, 0, port->drive); 51 if (state) val |= 0x10; 52 else val &= 0xef; 53 nv_wrvgac(i2c, 0, port->drive, val | 0x01); 54 } 55 56 static int 57 nv04_i2c_sense_scl(struct nvkm_i2c_port *base) 58 { 59 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 60 struct nv04_i2c_port *port = (void *)base; 61 return !!(nv_rdvgac(i2c, 0, port->sense) & 0x04); 62 } 63 64 static int 65 nv04_i2c_sense_sda(struct nvkm_i2c_port *base) 66 { 67 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 68 struct nv04_i2c_port *port = (void *)base; 69 return !!(nv_rdvgac(i2c, 0, port->sense) & 0x08); 70 } 71 72 static const struct nvkm_i2c_func 73 nv04_i2c_func = { 74 .drive_scl = nv04_i2c_drive_scl, 75 .drive_sda = nv04_i2c_drive_sda, 76 .sense_scl = nv04_i2c_sense_scl, 77 .sense_sda = nv04_i2c_sense_sda, 78 }; 79 80 static int 81 nv04_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 82 struct nvkm_oclass *oclass, void *data, u32 index, 83 struct nvkm_object **pobject) 84 { 85 struct dcb_i2c_entry *info = data; 86 struct nv04_i2c_port *port; 87 int ret; 88 89 ret = nvkm_i2c_port_create(parent, engine, oclass, index, 90 &nvkm_i2c_bit_algo, &nv04_i2c_func, &port); 91 *pobject = nv_object(port); 92 if (ret) 93 return ret; 94 95 port->drive = info->drive; 96 port->sense = info->sense; 97 return 0; 98 } 99 100 static struct nvkm_oclass 101 nv04_i2c_sclass[] = { 102 { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV04_BIT), 103 .ofuncs = &(struct nvkm_ofuncs) { 104 .ctor = nv04_i2c_port_ctor, 105 .dtor = _nvkm_i2c_port_dtor, 106 .init = _nvkm_i2c_port_init, 107 .fini = _nvkm_i2c_port_fini, 108 }, 109 }, 110 {} 111 }; 112 113 struct nvkm_oclass * 114 nv04_i2c_oclass = &(struct nvkm_i2c_impl) { 115 .base.handle = NV_SUBDEV(I2C, 0x04), 116 .base.ofuncs = &(struct nvkm_ofuncs) { 117 .ctor = _nvkm_i2c_ctor, 118 .dtor = _nvkm_i2c_dtor, 119 .init = _nvkm_i2c_init, 120 .fini = _nvkm_i2c_fini, 121 }, 122 .sclass = nv04_i2c_sclass, 123 .pad_x = &nv04_i2c_pad_oclass, 124 }.base; 125