diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c new file mode 100644 index 000000000000..954f5b76bfcf --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/auxg94.c @@ -0,0 +1,181 @@ +/* + * 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; +} |