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_priv { 29 struct nvkm_i2c base; 30 }; 31 32 struct nv04_i2c_port { 33 struct nvkm_i2c_port base; 34 u8 drive; 35 u8 sense; 36 }; 37 38 static void 39 nv04_i2c_drive_scl(struct nvkm_i2c_port *base, int state) 40 { 41 struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base); 42 struct nv04_i2c_port *port = (void *)base; 43 u8 val = nv_rdvgac(priv, 0, port->drive); 44 if (state) val |= 0x20; 45 else val &= 0xdf; 46 nv_wrvgac(priv, 0, port->drive, val | 0x01); 47 } 48 49 static void 50 nv04_i2c_drive_sda(struct nvkm_i2c_port *base, int state) 51 { 52 struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base); 53 struct nv04_i2c_port *port = (void *)base; 54 u8 val = nv_rdvgac(priv, 0, port->drive); 55 if (state) val |= 0x10; 56 else val &= 0xef; 57 nv_wrvgac(priv, 0, port->drive, val | 0x01); 58 } 59 60 static int 61 nv04_i2c_sense_scl(struct nvkm_i2c_port *base) 62 { 63 struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base); 64 struct nv04_i2c_port *port = (void *)base; 65 return !!(nv_rdvgac(priv, 0, port->sense) & 0x04); 66 } 67 68 static int 69 nv04_i2c_sense_sda(struct nvkm_i2c_port *base) 70 { 71 struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base); 72 struct nv04_i2c_port *port = (void *)base; 73 return !!(nv_rdvgac(priv, 0, port->sense) & 0x08); 74 } 75 76 static const struct nvkm_i2c_func 77 nv04_i2c_func = { 78 .drive_scl = nv04_i2c_drive_scl, 79 .drive_sda = nv04_i2c_drive_sda, 80 .sense_scl = nv04_i2c_sense_scl, 81 .sense_sda = nv04_i2c_sense_sda, 82 }; 83 84 static int 85 nv04_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 86 struct nvkm_oclass *oclass, void *data, u32 index, 87 struct nvkm_object **pobject) 88 { 89 struct dcb_i2c_entry *info = data; 90 struct nv04_i2c_port *port; 91 int ret; 92 93 ret = nvkm_i2c_port_create(parent, engine, oclass, index, 94 &nvkm_i2c_bit_algo, &nv04_i2c_func, &port); 95 *pobject = nv_object(port); 96 if (ret) 97 return ret; 98 99 port->drive = info->drive; 100 port->sense = info->sense; 101 return 0; 102 } 103 104 static struct nvkm_oclass 105 nv04_i2c_sclass[] = { 106 { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV04_BIT), 107 .ofuncs = &(struct nvkm_ofuncs) { 108 .ctor = nv04_i2c_port_ctor, 109 .dtor = _nvkm_i2c_port_dtor, 110 .init = _nvkm_i2c_port_init, 111 .fini = _nvkm_i2c_port_fini, 112 }, 113 }, 114 {} 115 }; 116 117 struct nvkm_oclass * 118 nv04_i2c_oclass = &(struct nvkm_i2c_impl) { 119 .base.handle = NV_SUBDEV(I2C, 0x04), 120 .base.ofuncs = &(struct nvkm_ofuncs) { 121 .ctor = _nvkm_i2c_ctor, 122 .dtor = _nvkm_i2c_dtor, 123 .init = _nvkm_i2c_init, 124 .fini = _nvkm_i2c_fini, 125 }, 126 .sclass = nv04_i2c_sclass, 127 .pad_x = &nv04_i2c_pad_oclass, 128 }.base; 129