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 nv4e_i2c_port { 29 struct nvkm_i2c_port base; 30 u32 addr; 31 }; 32 33 static void 34 nv4e_i2c_drive_scl(struct nvkm_i2c_port *base, int state) 35 { 36 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 37 struct nv4e_i2c_port *port = (void *)base; 38 nv_mask(i2c, port->addr, 0x2f, state ? 0x21 : 0x01); 39 } 40 41 static void 42 nv4e_i2c_drive_sda(struct nvkm_i2c_port *base, int state) 43 { 44 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 45 struct nv4e_i2c_port *port = (void *)base; 46 nv_mask(i2c, port->addr, 0x1f, state ? 0x11 : 0x01); 47 } 48 49 static int 50 nv4e_i2c_sense_scl(struct nvkm_i2c_port *base) 51 { 52 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 53 struct nv4e_i2c_port *port = (void *)base; 54 return !!(nv_rd32(i2c, port->addr) & 0x00040000); 55 } 56 57 static int 58 nv4e_i2c_sense_sda(struct nvkm_i2c_port *base) 59 { 60 struct nvkm_i2c *i2c = (void *)nvkm_i2c(base); 61 struct nv4e_i2c_port *port = (void *)base; 62 return !!(nv_rd32(i2c, port->addr) & 0x00080000); 63 } 64 65 static const struct nvkm_i2c_func 66 nv4e_i2c_func = { 67 .drive_scl = nv4e_i2c_drive_scl, 68 .drive_sda = nv4e_i2c_drive_sda, 69 .sense_scl = nv4e_i2c_sense_scl, 70 .sense_sda = nv4e_i2c_sense_sda, 71 }; 72 73 static int 74 nv4e_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine, 75 struct nvkm_oclass *oclass, void *data, u32 index, 76 struct nvkm_object **pobject) 77 { 78 struct dcb_i2c_entry *info = data; 79 struct nv4e_i2c_port *port; 80 int ret; 81 82 ret = nvkm_i2c_port_create(parent, engine, oclass, index, 83 &nvkm_i2c_bit_algo, &nv4e_i2c_func, &port); 84 *pobject = nv_object(port); 85 if (ret) 86 return ret; 87 88 port->addr = 0x600800 + info->drive; 89 return 0; 90 } 91 92 static struct nvkm_oclass 93 nv4e_i2c_sclass[] = { 94 { .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV4E_BIT), 95 .ofuncs = &(struct nvkm_ofuncs) { 96 .ctor = nv4e_i2c_port_ctor, 97 .dtor = _nvkm_i2c_port_dtor, 98 .init = _nvkm_i2c_port_init, 99 .fini = _nvkm_i2c_port_fini, 100 }, 101 }, 102 {} 103 }; 104 105 struct nvkm_oclass * 106 nv4e_i2c_oclass = &(struct nvkm_i2c_impl) { 107 .base.handle = NV_SUBDEV(I2C, 0x4e), 108 .base.ofuncs = &(struct nvkm_ofuncs) { 109 .ctor = _nvkm_i2c_ctor, 110 .dtor = _nvkm_i2c_dtor, 111 .init = _nvkm_i2c_init, 112 .fini = _nvkm_i2c_fini, 113 }, 114 .sclass = nv4e_i2c_sclass, 115 .pad_x = &nv04_i2c_pad_oclass, 116 }.base; 117