1 /* $NetBSD: nouveau_nvkm_subdev_i2c_auxg94.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $ */ 2 3 /* 4 * Copyright 2015 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial busions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs <bskeggs (at) redhat.com> 25 */ 26 #include <sys/cdefs.h> 27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_i2c_auxg94.c,v 1.3 2021/12/18 23:45:40 riastradh Exp $"); 28 29 #define g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base) 30 #include "aux.h" 31 32 struct g94_i2c_aux { 33 struct nvkm_i2c_aux base; 34 int ch; 35 }; 36 37 static void 38 g94_i2c_aux_fini(struct g94_i2c_aux *aux) 39 { 40 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 41 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000); 42 } 43 44 static int 45 g94_i2c_aux_init(struct g94_i2c_aux *aux) 46 { 47 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 48 const u32 unksel = 1; /* nfi which to use, or if it matters.. */ 49 const u32 ureq = unksel ? 0x00100000 : 0x00200000; 50 const u32 urep = unksel ? 0x01000000 : 0x02000000; 51 u32 ctrl, timeout; 52 53 /* wait up to 1ms for any previous transaction to be done... */ 54 timeout = 1000; 55 do { 56 ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); 57 udelay(1); 58 if (!timeout--) { 59 AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl); 60 return -EBUSY; 61 } 62 } while (ctrl & 0x03010000); 63 64 /* set some magic, and wait up to 1ms for it to appear */ 65 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq); 66 timeout = 1000; 67 do { 68 ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); 69 udelay(1); 70 if (!timeout--) { 71 AUX_ERR(&aux->base, "magic wait %08x", ctrl); 72 g94_i2c_aux_fini(aux); 73 return -EBUSY; 74 } 75 } while ((ctrl & 0x03000000) != urep); 76 77 return 0; 78 } 79 80 int 81 g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry, 82 u8 type, u32 addr, u8 *data, u8 *size) 83 { 84 struct g94_i2c_aux *aux = g94_i2c_aux(obj); 85 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 86 const u32 base = aux->ch * 0x50; 87 u32 ctrl, stat, timeout, retries = 0; 88 u32 xbuf[4] = {}; 89 int ret, i; 90 91 AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, *size); 92 93 ret = g94_i2c_aux_init(aux); 94 if (ret < 0) 95 goto out; 96 97 stat = nvkm_rd32(device, 0x00e4e8 + base); 98 if (!(stat & 0x10000000)) { 99 AUX_TRACE(&aux->base, "sink not detected"); 100 ret = -ENXIO; 101 goto out; 102 } 103 104 if (!(type & 1)) { 105 memcpy(xbuf, data, *size); 106 for (i = 0; i < 16; i += 4) { 107 AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]); 108 nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]); 109 } 110 } 111 112 ctrl = nvkm_rd32(device, 0x00e4e4 + base); 113 ctrl &= ~0x0001f1ff; 114 ctrl |= type << 12; 115 ctrl |= (*size ? (*size - 1) : 0x00000100); 116 nvkm_wr32(device, 0x00e4e0 + base, addr); 117 118 /* (maybe) retry transaction a number of times on failure... */ 119 do { 120 /* reset, and delay a while if this is a retry */ 121 nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl); 122 nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl); 123 if (retries) 124 udelay(400); 125 126 /* transaction request, wait up to 1ms for it to complete */ 127 nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl); 128 129 timeout = 1000; 130 do { 131 ctrl = nvkm_rd32(device, 0x00e4e4 + base); 132 udelay(1); 133 if (!timeout--) { 134 AUX_ERR(&aux->base, "timeout %08x", ctrl); 135 ret = -EIO; 136 goto out; 137 } 138 } while (ctrl & 0x00010000); 139 ret = 0; 140 141 /* read status, and check if transaction completed ok */ 142 stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0); 143 if ((stat & 0x000f0000) == 0x00080000 || 144 (stat & 0x000f0000) == 0x00020000) 145 ret = 1; 146 if ((stat & 0x00000100)) 147 ret = -ETIMEDOUT; 148 if ((stat & 0x00000e00)) 149 ret = -EIO; 150 151 AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat); 152 } while (ret && retry && retries++ < 32); 153 154 if (type & 1) { 155 for (i = 0; i < 16; i += 4) { 156 xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i); 157 AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]); 158 } 159 memcpy(data, xbuf, *size); 160 *size = stat & 0x0000001f; 161 } 162 163 out: 164 g94_i2c_aux_fini(aux); 165 return ret < 0 ? ret : (stat & 0x000f0000) >> 16; 166 } 167 168 int 169 g94_i2c_aux_new_(const struct nvkm_i2c_aux_func *func, 170 struct nvkm_i2c_pad *pad, int index, u8 drive, 171 struct nvkm_i2c_aux **paux) 172 { 173 struct g94_i2c_aux *aux; 174 175 if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL))) 176 return -ENOMEM; 177 *paux = &aux->base; 178 179 nvkm_i2c_aux_ctor(func, pad, index, &aux->base); 180 aux->ch = drive; 181 aux->base.intr = 1 << aux->ch; 182 return 0; 183 } 184 185 static const struct nvkm_i2c_aux_func 186 g94_i2c_aux = { 187 .xfer = g94_i2c_aux_xfer, 188 }; 189 190 int 191 g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive, 192 struct nvkm_i2c_aux **paux) 193 { 194 return g94_i2c_aux_new_(&g94_i2c_aux, pad, index, drive, paux); 195 } 196
Indexes created Fri Sep 26 20:09:58 GMT 2025