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 "nv50.h" 25 26 void 27 nv50_i2c_drive_scl(struct nvkm_i2c_port *base, int state) 28 { 29 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 30 struct nvkm_device *device = i2c->subdev.device; 31 struct nv50_i2c_port *port = (void *)base; 32 if (state) port->state |= 0x01; 33 else port->state &= 0xfe; 34 nvkm_wr32(device, port->addr, port->state); 35 } 36 37 void 38 nv50_i2c_drive_sda(struct nvkm_i2c_port *base, int state) 39 { 40 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 41 struct nvkm_device *device = i2c->subdev.device; 42 struct nv50_i2c_port *port = (void *)base; 43 if (state) port->state |= 0x02; 44 else port->state &= 0xfd; 45 nvkm_wr32(device, port->addr, port->state); 46 } 47 48 int 49 nv50_i2c_sense_scl(struct nvkm_i2c_port *base) 50 { 51 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 52 struct nvkm_device *device = i2c->subdev.device; 53 struct nv50_i2c_port *port = (void *)base; 54 return !!(nvkm_rd32(device, port->addr) & 0x00000001); 55 } 56 57 int 58 nv50_i2c_sense_sda(struct nvkm_i2c_port *base) 59 { 60 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 61 struct nvkm_device *device = i2c->subdev.device; 62 struct nv50_i2c_port *port = (void *)base; 63 return !!(nvkm_rd32(device, port->addr) & 0x00000002); 64 } 65 66 static const struct nvkm_i2c_func 67 nv50_i2c_func = { 68 .drive_scl = nv50_i2c_drive_scl, 69 .drive_sda = nv50_i2c_drive_sda, 70 .sense_scl = nv50_i2c_sense_scl, 71 .sense_sda = nv50_i2c_sense_sda, 72 }; 73 74 const u32 nv50_i2c_addr[] = { 75 0x00e138, 0x00e150, 0x00e168, 0x00e180, 76 0x00e254, 0x00e274, 0x00e764, 0x00e780, 77 0x00e79c, 0x00e7b8 78 }; 79 const int nv50_i2c_addr_nr = ARRAY_SIZE(nv50_i2c_addr); 80 81 static int 82 nv50_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 83 struct nvkm_oclass *oclass, void *data, u32 index, 84 struct nvkm_object **pobject) 85 { 86 struct dcb_i2c_entry *info = data; 87 struct nv50_i2c_port *port; 88 int ret; 89 90 ret = nvkm_i2c_port_create(parent, engine, oclass, index, 91 &nvkm_i2c_bit_algo, &nv50_i2c_func, &port); 92 *pobject = nv_object(port); 93 if (ret) 94 return ret; 95 96 if (info->drive >= nv50_i2c_addr_nr) 97 return -EINVAL; 98 99 port->state = 0x00000007; 100 port->addr = nv50_i2c_addr[info->drive]; 101 return 0; 102 } 103 104 int 105 nv50_i2c_port_init(struct nvkm_object *object) 106 { 107 struct nvkm_i2c *i2c = (void *)nvkm_i2c(object); 108 struct nvkm_device *device = i2c->subdev.device; 109 struct nv50_i2c_port *port = (void *)object; 110 nvkm_wr32(device, port->addr, port->state); 111 return nvkm_i2c_port_init(&port->base); 112 } 113 114 static struct nvkm_oclass 115 nv50_i2c_sclass[] = { 116 { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT), 117 .ofuncs = &(struct nvkm_ofuncs) { 118 .ctor = nv50_i2c_port_ctor, 119 .dtor = _nvkm_i2c_port_dtor, 120 .init = nv50_i2c_port_init, 121 .fini = _nvkm_i2c_port_fini, 122 }, 123 }, 124 {} 125 }; 126 127 struct nvkm_oclass * 128 nv50_i2c_oclass = &(struct nvkm_i2c_impl) { 129 .base.handle = NV_SUBDEV(I2C, 0x50), 130 .base.ofuncs = &(struct nvkm_ofuncs) { 131 .ctor = _nvkm_i2c_ctor, 132 .dtor = _nvkm_i2c_dtor, 133 .init = _nvkm_i2c_init, 134 .fini = _nvkm_i2c_fini, 135 }, 136 .sclass = nv50_i2c_sclass, 137 .pad_x = &nv04_i2c_pad_oclass, 138 }.base; 139