| /* |
| * Copyright 2015 Red Hat Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial busions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: Ben Skeggs <bskeggs@redhat.com> |
| */ |
| #define g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base) |
| #include "aux.h" |
| |
| struct g94_i2c_aux { |
| struct nvkm_i2c_aux base; |
| int ch; |
| }; |
| |
| static void |
| g94_i2c_aux_fini(struct g94_i2c_aux *aux) |
| { |
| struct nvkm_device *device = aux->base.pad->i2c->subdev.device; |
| nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000); |
| } |
| |
| static int |
| g94_i2c_aux_init(struct g94_i2c_aux *aux) |
| { |
| struct nvkm_device *device = aux->base.pad->i2c->subdev.device; |
| const u32 unksel = 1; /* nfi which to use, or if it matters.. */ |
| const u32 ureq = unksel ? 0x00100000 : 0x00200000; |
| const u32 urep = unksel ? 0x01000000 : 0x02000000; |
| u32 ctrl, timeout; |
| |
| /* wait up to 1ms for any previous transaction to be done... */ |
| timeout = 1000; |
| do { |
| ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl); |
| return -EBUSY; |
| } |
| } while (ctrl & 0x03010000); |
| |
| /* set some magic, and wait up to 1ms for it to appear */ |
| nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq); |
| timeout = 1000; |
| do { |
| ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50)); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR(&aux->base, "magic wait %08x", ctrl); |
| g94_i2c_aux_fini(aux); |
| return -EBUSY; |
| } |
| } while ((ctrl & 0x03000000) != urep); |
| |
| return 0; |
| } |
| |
| static int |
| g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry, |
| u8 type, u32 addr, u8 *data, u8 size) |
| { |
| struct g94_i2c_aux *aux = g94_i2c_aux(obj); |
| struct nvkm_device *device = aux->base.pad->i2c->subdev.device; |
| const u32 base = aux->ch * 0x50; |
| u32 ctrl, stat, timeout, retries; |
| u32 xbuf[4] = {}; |
| int ret, i; |
| |
| AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size); |
| |
| ret = g94_i2c_aux_init(aux); |
| if (ret < 0) |
| goto out; |
| |
| stat = nvkm_rd32(device, 0x00e4e8 + base); |
| if (!(stat & 0x10000000)) { |
| AUX_TRACE(&aux->base, "sink not detected"); |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| if (!(type & 1)) { |
| memcpy(xbuf, data, size); |
| for (i = 0; i < 16; i += 4) { |
| AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]); |
| nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]); |
| } |
| } |
| |
| ctrl = nvkm_rd32(device, 0x00e4e4 + base); |
| ctrl &= ~0x0001f0ff; |
| ctrl |= type << 12; |
| ctrl |= size - 1; |
| nvkm_wr32(device, 0x00e4e0 + base, addr); |
| |
| /* (maybe) retry transaction a number of times on failure... */ |
| for (retries = 0; !ret && retries < 32; retries++) { |
| /* reset, and delay a while if this is a retry */ |
| nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl); |
| nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl); |
| if (retries) |
| udelay(400); |
| |
| /* transaction request, wait up to 1ms for it to complete */ |
| nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl); |
| |
| timeout = 1000; |
| do { |
| ctrl = nvkm_rd32(device, 0x00e4e4 + base); |
| udelay(1); |
| if (!timeout--) { |
| AUX_ERR(&aux->base, "timeout %08x", ctrl); |
| ret = -EIO; |
| goto out; |
| } |
| } while (ctrl & 0x00010000); |
| ret = 1; |
| |
| /* read status, and check if transaction completed ok */ |
| stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0); |
| if ((stat & 0x000f0000) == 0x00080000 || |
| (stat & 0x000f0000) == 0x00020000) |
| ret = retry ? 0 : 1; |
| if ((stat & 0x00000100)) |
| ret = -ETIMEDOUT; |
| if ((stat & 0x00000e00)) |
| ret = -EIO; |
| |
| AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat); |
| } |
| |
| if (type & 1) { |
| for (i = 0; i < 16; i += 4) { |
| xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i); |
| AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]); |
| } |
| memcpy(data, xbuf, size); |
| } |
| |
| out: |
| g94_i2c_aux_fini(aux); |
| return ret < 0 ? ret : (stat & 0x000f0000) >> 16; |
| } |
| |
| static const struct nvkm_i2c_aux_func |
| g94_i2c_aux_func = { |
| .xfer = g94_i2c_aux_xfer, |
| }; |
| |
| int |
| g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive, |
| struct nvkm_i2c_aux **paux) |
| { |
| struct g94_i2c_aux *aux; |
| |
| if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL))) |
| return -ENOMEM; |
| *paux = &aux->base; |
| |
| nvkm_i2c_aux_ctor(&g94_i2c_aux_func, pad, index, &aux->base); |
| aux->ch = drive; |
| aux->base.intr = 1 << aux->ch; |
| return 0; |
| } |