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/*
* 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 gm204_i2c_aux(p) container_of((p), struct gm204_i2c_aux, base)
#include "aux.h"
struct gm204_i2c_aux {
struct nvkm_i2c_aux base;
int ch;
};
static void
gm204_i2c_aux_fini(struct gm204_i2c_aux *aux)
{
struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
nvkm_mask(device, 0x00d954 + (aux->ch * 0x50), 0x00310000, 0x00000000);
}
static int
gm204_i2c_aux_init(struct gm204_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, 0x00d954 + (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, 0x00d954 + (aux->ch * 0x50), 0x00300000, ureq);
timeout = 1000;
do {
ctrl = nvkm_rd32(device, 0x00d954 + (aux->ch * 0x50));
udelay(1);
if (!timeout--) {
AUX_ERR(&aux->base, "magic wait %08x", ctrl);
gm204_i2c_aux_fini(aux);
return -EBUSY;
}
} while ((ctrl & 0x03000000) != urep);
return 0;
}
static int
gm204_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
u8 type, u32 addr, u8 *data, u8 size)
{
struct gm204_i2c_aux *aux = gm204_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 = gm204_i2c_aux_init(aux);
if (ret < 0)
goto out;
stat = nvkm_rd32(device, 0x00d958 + 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, 0x00d930 + base + i, xbuf[i / 4]);
}
}
ctrl = nvkm_rd32(device, 0x00d954 + base);
ctrl &= ~0x0001f0ff;
ctrl |= type << 12;
ctrl |= size - 1;
nvkm_wr32(device, 0x00d950 + 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, 0x00d954 + base, 0x80000000 | ctrl);
nvkm_wr32(device, 0x00d954 + base, 0x00000000 | ctrl);
if (retries)
udelay(400);
/* transaction request, wait up to 1ms for it to complete */
nvkm_wr32(device, 0x00d954 + base, 0x00010000 | ctrl);
timeout = 1000;
do {
ctrl = nvkm_rd32(device, 0x00d954 + 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, 0x00d958 + 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, 0x00d940 + base + i);
AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
}
memcpy(data, xbuf, size);
}
out:
gm204_i2c_aux_fini(aux);
return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
}
static const struct nvkm_i2c_aux_func
gm204_i2c_aux_func = {
.xfer = gm204_i2c_aux_xfer,
};
int
gm204_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,
struct nvkm_i2c_aux **paux)
{
struct gm204_i2c_aux *aux;
if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
return -ENOMEM;
*paux = &aux->base;
nvkm_i2c_aux_ctor(&gm204_i2c_aux_func, pad, index, &aux->base);
aux->ch = drive;
aux->base.intr = 1 << aux->ch;
return 0;
}
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