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1/*2 * Copyright 2015 Red Hat Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial busions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * 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 27struct g94_i2c_aux {28 struct nvkm_i2c_aux base;29 int ch;30};31 32static void33g94_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 39static int40g94_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 75int76g94_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_i2c *i2c = aux->base.pad->i2c;81 struct nvkm_device *device = i2c->subdev.device;82 const u32 base = aux->ch * 0x50;83 u32 ctrl, stat, timeout, retries = 0;84 u32 xbuf[4] = {};85 int ret, i;86 87 AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, *size);88 89 ret = g94_i2c_aux_init(aux);90 if (ret < 0)91 goto out;92 93 stat = nvkm_rd32(device, 0x00e4e8 + base);94 if (!(stat & 0x10000000)) {95 AUX_TRACE(&aux->base, "sink not detected");96 ret = -ENXIO;97 goto out;98 }99 100 nvkm_i2c_aux_autodpcd(i2c, aux->ch, false);101 102 if (!(type & 1)) {103 memcpy(xbuf, data, *size);104 for (i = 0; i < 16; i += 4) {105 AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]);106 nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]);107 }108 }109 110 ctrl = nvkm_rd32(device, 0x00e4e4 + base);111 ctrl &= ~0x0001f1ff;112 ctrl |= type << 12;113 ctrl |= (*size ? (*size - 1) : 0x00000100);114 nvkm_wr32(device, 0x00e4e0 + base, addr);115 116 /* (maybe) retry transaction a number of times on failure... */117 do {118 /* reset, and delay a while if this is a retry */119 nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl);120 nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl);121 if (retries)122 udelay(400);123 124 /* transaction request, wait up to 2ms for it to complete */125 nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl);126 127 timeout = 2000;128 do {129 ctrl = nvkm_rd32(device, 0x00e4e4 + base);130 udelay(1);131 if (!timeout--) {132 AUX_ERR(&aux->base, "timeout %08x", ctrl);133 ret = -EIO;134 goto out_err;135 }136 } while (ctrl & 0x00010000);137 ret = 0;138 139 /* read status, and check if transaction completed ok */140 stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0);141 if ((stat & 0x000f0000) == 0x00080000 ||142 (stat & 0x000f0000) == 0x00020000)143 ret = 1;144 if ((stat & 0x00000100))145 ret = -ETIMEDOUT;146 if ((stat & 0x00000e00))147 ret = -EIO;148 149 AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat);150 } while (ret && retry && retries++ < 32);151 152 if (type & 1) {153 for (i = 0; i < 16; i += 4) {154 xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i);155 AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);156 }157 memcpy(data, xbuf, *size);158 *size = stat & 0x0000001f;159 }160out_err:161 nvkm_i2c_aux_autodpcd(i2c, aux->ch, true);162out:163 g94_i2c_aux_fini(aux);164 return ret < 0 ? ret : (stat & 0x000f0000) >> 16;165}166 167int168g94_i2c_aux_new_(const struct nvkm_i2c_aux_func *func,169 struct nvkm_i2c_pad *pad, int index, u8 drive,170 struct nvkm_i2c_aux **paux)171{172 struct g94_i2c_aux *aux;173 174 if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))175 return -ENOMEM;176 *paux = &aux->base;177 178 nvkm_i2c_aux_ctor(func, pad, index, &aux->base);179 aux->ch = drive;180 aux->base.intr = 1 << aux->ch;181 return 0;182}183 184static const struct nvkm_i2c_aux_func185g94_i2c_aux = {186 .xfer = g94_i2c_aux_xfer,187};188 189int190g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,191 struct nvkm_i2c_aux **paux)192{193 return g94_i2c_aux_new_(&g94_i2c_aux, pad, index, drive, paux);194}195