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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | ||
/* | ||
* | ||
* (C) COPYRIGHT 2023 ARM Limited. All rights reserved. | ||
* | ||
* This program is free software and is provided to you under the terms of the | ||
* GNU General Public License version 2 as published by the Free Software | ||
* Foundation, and any use by you of this program is subject to the terms | ||
* of such GNU license. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, you can access it online at | ||
* http://www.gnu.org/licenses/gpl-2.0.html. | ||
* | ||
*/ | ||
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#ifndef _KBASE_REFCOUNT_DEFS_H_ | ||
#define _KBASE_REFCOUNT_DEFS_H_ | ||
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/* | ||
* The Refcount API is available from 4.11 onwards | ||
* This file hides the compatibility issues with this for the rest the driver | ||
*/ | ||
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#include <linux/version.h> | ||
#include <linux/types.h> | ||
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#if (KERNEL_VERSION(4, 11, 0) > LINUX_VERSION_CODE) | ||
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#define kbase_refcount_t atomic_t | ||
#define kbase_refcount_read(x) atomic_read(x) | ||
#define kbase_refcount_set(x, v) atomic_set(x, v) | ||
#define kbase_refcount_dec_and_test(x) atomic_dec_and_test(x) | ||
#define kbase_refcount_dec(x) atomic_dec(x) | ||
#define kbase_refcount_inc_not_zero(x) atomic_inc_not_zero(x) | ||
#define kbase_refcount_inc(x) atomic_inc(x) | ||
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#else | ||
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#include <linux/refcount.h> | ||
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#define kbase_refcount_t refcount_t | ||
#define kbase_refcount_read(x) refcount_read(x) | ||
#define kbase_refcount_set(x, v) refcount_set(x, v) | ||
#define kbase_refcount_dec_and_test(x) refcount_dec_and_test(x) | ||
#define kbase_refcount_dec(x) refcount_dec(x) | ||
#define kbase_refcount_inc_not_zero(x) refcount_inc_not_zero(x) | ||
#define kbase_refcount_inc(x) refcount_inc(x) | ||
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#endif /* (KERNEL_VERSION(4, 11, 0) > LINUX_VERSION_CODE) */ | ||
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#endif /* _KBASE_REFCOUNT_DEFS_H_ */ |
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/* | ||
* Copyright 2009 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 portions 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 | ||
*/ | ||
#include "aux.h" | ||
#include "pad.h" | ||
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static int | ||
nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) | ||
{ | ||
struct nvkm_i2c_aux *aux = container_of(adap, typeof(*aux), i2c); | ||
struct i2c_msg *msg = msgs; | ||
int ret, mcnt = num; | ||
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ret = nvkm_i2c_aux_acquire(aux); | ||
if (ret) | ||
return ret; | ||
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while (mcnt--) { | ||
u8 remaining = msg->len; | ||
u8 *ptr = msg->buf; | ||
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while (remaining) { | ||
u8 cnt, retries, cmd; | ||
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if (msg->flags & I2C_M_RD) | ||
cmd = 1; | ||
else | ||
cmd = 0; | ||
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if (mcnt || remaining > 16) | ||
cmd |= 4; /* MOT */ | ||
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for (retries = 0, cnt = 0; | ||
retries < 32 && !cnt; | ||
retries++) { | ||
cnt = min_t(u8, remaining, 16); | ||
ret = aux->func->xfer(aux, true, cmd, | ||
msg->addr, ptr, &cnt); | ||
if (ret < 0) | ||
goto out; | ||
} | ||
if (!cnt) { | ||
AUX_TRACE(aux, "no data after 32 retries"); | ||
ret = -EIO; | ||
goto out; | ||
} | ||
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ptr += cnt; | ||
remaining -= cnt; | ||
} | ||
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msg++; | ||
} | ||
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ret = num; | ||
out: | ||
nvkm_i2c_aux_release(aux); | ||
return ret; | ||
} | ||
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static u32 | ||
nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap) | ||
{ | ||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; | ||
} | ||
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static const struct i2c_algorithm | ||
nvkm_i2c_aux_i2c_algo = { | ||
.master_xfer = nvkm_i2c_aux_i2c_xfer, | ||
.functionality = nvkm_i2c_aux_i2c_func | ||
}; | ||
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void | ||
nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *aux, bool monitor) | ||
{ | ||
struct nvkm_i2c_pad *pad = aux->pad; | ||
AUX_TRACE(aux, "monitor: %s", monitor ? "yes" : "no"); | ||
if (monitor) | ||
nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_AUX); | ||
else | ||
nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_OFF); | ||
} | ||
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void | ||
nvkm_i2c_aux_release(struct nvkm_i2c_aux *aux) | ||
{ | ||
struct nvkm_i2c_pad *pad = aux->pad; | ||
AUX_TRACE(aux, "release"); | ||
nvkm_i2c_pad_release(pad); | ||
mutex_unlock(&aux->mutex); | ||
} | ||
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int | ||
nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux) | ||
{ | ||
struct nvkm_i2c_pad *pad = aux->pad; | ||
int ret; | ||
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AUX_TRACE(aux, "acquire"); | ||
mutex_lock(&aux->mutex); | ||
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if (aux->enabled) | ||
ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX); | ||
else | ||
ret = -EIO; | ||
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if (ret) | ||
mutex_unlock(&aux->mutex); | ||
return ret; | ||
} | ||
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int | ||
nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type, | ||
u32 addr, u8 *data, u8 *size) | ||
{ | ||
if (!*size && !aux->func->address_only) { | ||
AUX_ERR(aux, "address-only transaction dropped"); | ||
return -ENOSYS; | ||
} | ||
return aux->func->xfer(aux, retry, type, addr, data, size); | ||
} | ||
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int | ||
nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef) | ||
{ | ||
if (aux->func->lnk_ctl) | ||
return aux->func->lnk_ctl(aux, nr, bw, ef); | ||
return -ENODEV; | ||
} | ||
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void | ||
nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux) | ||
{ | ||
struct nvkm_i2c_aux *aux = *paux; | ||
if (aux && !WARN_ON(!aux->func)) { | ||
AUX_TRACE(aux, "dtor"); | ||
list_del(&aux->head); | ||
i2c_del_adapter(&aux->i2c); | ||
kfree(*paux); | ||
*paux = NULL; | ||
} | ||
} | ||
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void | ||
nvkm_i2c_aux_init(struct nvkm_i2c_aux *aux) | ||
{ | ||
AUX_TRACE(aux, "init"); | ||
mutex_lock(&aux->mutex); | ||
aux->enabled = true; | ||
mutex_unlock(&aux->mutex); | ||
} | ||
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void | ||
nvkm_i2c_aux_fini(struct nvkm_i2c_aux *aux) | ||
{ | ||
AUX_TRACE(aux, "fini"); | ||
mutex_lock(&aux->mutex); | ||
aux->enabled = false; | ||
mutex_unlock(&aux->mutex); | ||
} | ||
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int | ||
nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func, | ||
struct nvkm_i2c_pad *pad, int id, | ||
struct nvkm_i2c_aux *aux) | ||
{ | ||
struct nvkm_device *device = pad->i2c->subdev.device; | ||
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aux->func = func; | ||
aux->pad = pad; | ||
aux->id = id; | ||
mutex_init(&aux->mutex); | ||
list_add_tail(&aux->head, &pad->i2c->aux); | ||
AUX_TRACE(aux, "ctor"); | ||
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snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x", | ||
dev_name(device->dev), id); | ||
aux->i2c.owner = THIS_MODULE; | ||
aux->i2c.dev.parent = device->dev; | ||
aux->i2c.algo = &nvkm_i2c_aux_i2c_algo; | ||
return i2c_add_adapter(&aux->i2c); | ||
} | ||
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int | ||
nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func, | ||
struct nvkm_i2c_pad *pad, int id, | ||
struct nvkm_i2c_aux **paux) | ||
{ | ||
if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL))) | ||
return -ENOMEM; | ||
return nvkm_i2c_aux_ctor(func, pad, id, *paux); | ||
} |
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/* SPDX-License-Identifier: MIT */ | ||
#ifndef __NVKM_I2C_AUX_H__ | ||
#define __NVKM_I2C_AUX_H__ | ||
#include "pad.h" | ||
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struct nvkm_i2c_aux_func { | ||
bool address_only; | ||
int (*xfer)(struct nvkm_i2c_aux *, bool retry, u8 type, | ||
u32 addr, u8 *data, u8 *size); | ||
int (*lnk_ctl)(struct nvkm_i2c_aux *, int link_nr, int link_bw, | ||
bool enhanced_framing); | ||
}; | ||
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int nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *, struct nvkm_i2c_pad *, | ||
int id, struct nvkm_i2c_aux *); | ||
int nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *, struct nvkm_i2c_pad *, | ||
int id, struct nvkm_i2c_aux **); | ||
void nvkm_i2c_aux_del(struct nvkm_i2c_aux **); | ||
void nvkm_i2c_aux_init(struct nvkm_i2c_aux *); | ||
void nvkm_i2c_aux_fini(struct nvkm_i2c_aux *); | ||
int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type, | ||
u32 addr, u8 *data, u8 *size); | ||
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int g94_i2c_aux_new_(const struct nvkm_i2c_aux_func *, struct nvkm_i2c_pad *, | ||
int, u8, struct nvkm_i2c_aux **); | ||
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int g94_i2c_aux_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_aux **); | ||
int g94_i2c_aux_xfer(struct nvkm_i2c_aux *, bool, u8, u32, u8 *, u8 *); | ||
int gf119_i2c_aux_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_aux **); | ||
int gm200_i2c_aux_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_aux **); | ||
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#define AUX_MSG(b,l,f,a...) do { \ | ||
struct nvkm_i2c_aux *_aux = (b); \ | ||
nvkm_##l(&_aux->pad->i2c->subdev, "aux %04x: "f"\n", _aux->id, ##a); \ | ||
} while(0) | ||
#define AUX_ERR(b,f,a...) AUX_MSG((b), error, f, ##a) | ||
#define AUX_DBG(b,f,a...) AUX_MSG((b), debug, f, ##a) | ||
#define AUX_TRACE(b,f,a...) AUX_MSG((b), trace, f, ##a) | ||
#endif |
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