1 /* 2 * Copyright 2015 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 busions 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 <bskeggs@redhat.com> 23 */ 24 #define g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base) 25 #include "aux.h" 26 27 struct g94_i2c_aux { 28 struct nvkm_i2c_aux base; 29 int ch; 30 }; 31 32 static void 33 g94_i2c_aux_fini(struct g94_i2c_aux *aux) 34 { 35 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 36 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000); 37 } 38 39 static int 40 g94_i2c_aux_init(struct g94_i2c_aux *aux) 41 { 42 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 43 const u32 unksel = 1; /* nfi which to use, or if it matters.. */ 44 const u32 ureq = unksel ? 0x00100000 : 0x00200000; 45 const u32 urep = unksel ? 0x01000000 : 0x02000000; 46 u32 ctrl, timeout; 47 48 /* wait up to 1ms for any previous transaction to be done... */ 49 timeout = 1000; 50 do { 51 ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); 52 udelay(1); 53 if (!timeout--) { 54 AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl); 55 return -EBUSY; 56 } 57 } while (ctrl & 0x03010000); 58 59 /* set some magic, and wait up to 1ms for it to appear */ 60 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq); 61 timeout = 1000; 62 do { 63 ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); 64 udelay(1); 65 if (!timeout--) { 66 AUX_ERR(&aux->base, "magic wait %08x", ctrl); 67 g94_i2c_aux_fini(aux); 68 return -EBUSY; 69 } 70 } while ((ctrl & 0x03000000) != urep); 71 72 return 0; 73 } 74 75 static int 76 g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry, 77 u8 type, u32 addr, u8 *data, u8 size) 78 { 79 struct g94_i2c_aux *aux = g94_i2c_aux(obj); 80 struct nvkm_device *device = aux->base.pad->i2c->subdev.device; 81 const u32 base = aux->ch * 0x50; 82 u32 ctrl, stat, timeout, retries = 0; 83 u32 xbuf[4] = {}; 84 int ret, i; 85 86 AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size); 87 88 ret = g94_i2c_aux_init(aux); 89 if (ret < 0) 90 goto out; 91 92 stat = nvkm_rd32(device, 0x00e4e8 + base); 93 if (!(stat & 0x10000000)) { 94 AUX_TRACE(&aux->base, "sink not detected"); 95 ret = -ENXIO; 96 goto out; 97 } 98 99 if (!(type & 1)) { 100 memcpy(xbuf, data, size); 101 for (i = 0; i < 16; i += 4) { 102 AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]); 103 nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]); 104 } 105 } 106 107 ctrl = nvkm_rd32(device, 0x00e4e4 + base); 108 ctrl &= ~0x0001f0ff; 109 ctrl |= type << 12; 110 ctrl |= size - 1; 111 nvkm_wr32(device, 0x00e4e0 + base, addr); 112 113 /* (maybe) retry transaction a number of times on failure... */ 114 do { 115 /* reset, and delay a while if this is a retry */ 116 nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl); 117 nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl); 118 if (retries) 119 udelay(400); 120 121 /* transaction request, wait up to 1ms for it to complete */ 122 nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl); 123 124 timeout = 1000; 125 do { 126 ctrl = nvkm_rd32(device, 0x00e4e4 + base); 127 udelay(1); 128 if (!timeout--) { 129 AUX_ERR(&aux->base, "timeout %08x", ctrl); 130 ret = -EIO; 131 goto out; 132 } 133 } while (ctrl & 0x00010000); 134 ret = 0; 135 136 /* read status, and check if transaction completed ok */ 137 stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0); 138 if ((stat & 0x000f0000) == 0x00080000 || 139 (stat & 0x000f0000) == 0x00020000) 140 ret = 1; 141 if ((stat & 0x00000100)) 142 ret = -ETIMEDOUT; 143 if ((stat & 0x00000e00)) 144 ret = -EIO; 145 146 AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat); 147 } while (ret && retry && retries++ < 32); 148 149 if (type & 1) { 150 for (i = 0; i < 16; i += 4) { 151 xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i); 152 AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]); 153 } 154 memcpy(data, xbuf, size); 155 } 156 157 out: 158 g94_i2c_aux_fini(aux); 159 return ret < 0 ? ret : (stat & 0x000f0000) >> 16; 160 } 161 162 static const struct nvkm_i2c_aux_func 163 g94_i2c_aux_func = { 164 .xfer = g94_i2c_aux_xfer, 165 }; 166 167 int 168 g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive, 169 struct nvkm_i2c_aux **paux) 170 { 171 struct g94_i2c_aux *aux; 172 173 if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL))) 174 return -ENOMEM; 175 *paux = &aux->base; 176 177 nvkm_i2c_aux_ctor(&g94_i2c_aux_func, pad, index, &aux->base); 178 aux->ch = drive; 179 aux->base.intr = 1 << aux->ch; 180 return 0; 181 } 182