/* Copyright (c) 2014 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/types.h>
#include <linux/netdevice.h>
#include <brcmu_utils.h>
#include <brcmu_wifi.h>
#include "dhd.h"
#include "commonring.h"
/* dma flushing needs implementation for mips and arm platforms. Should
* be put in util. Note, this is not real flushing. It is virtual non
* cached memory. Only write buffers should have to be drained. Though
* this may be different depending on platform......
* SEE ALSO msgbuf.c
*/
#define brcmf_dma_flush(addr, len)
#define brcmf_dma_invalidate_cache(addr, len)
void brcmf_commonring_register_cb(struct brcmf_commonring *commonring,
int (*cr_ring_bell)(void *ctx),
int (*cr_update_rptr)(void *ctx),
int (*cr_update_wptr)(void *ctx),
int (*cr_write_rptr)(void *ctx),
int (*cr_write_wptr)(void *ctx), void *ctx)
{
commonring->cr_ring_bell = cr_ring_bell;
commonring->cr_update_rptr = cr_update_rptr;
commonring->cr_update_wptr = cr_update_wptr;
commonring->cr_write_rptr = cr_write_rptr;
commonring->cr_write_wptr = cr_write_wptr;
commonring->cr_ctx = ctx;
}
void brcmf_commonring_config(struct brcmf_commonring *commonring, u16 depth,
u16 item_len, void *buf_addr)
{
commonring->depth = depth;
commonring->item_len = item_len;
commonring->buf_addr = buf_addr;
if (!commonring->inited) {
spin_lock_init(&commonring->lock);
commonring->inited = true;
}
commonring->r_ptr = 0;
if (commonring->cr_write_rptr)
commonring->cr_write_rptr(commonring->cr_ctx);
commonring->w_ptr = 0;
if (commonring->cr_write_wptr)
commonring->cr_write_wptr(commonring->cr_ctx);
commonring->f_ptr = 0;
}
void brcmf_commonring_lock(struct brcmf_commonring *commonring)
__acquires(&commonring->lock)
{
unsigned long flags;
spin_lock_irqsave(&commonring->lock, flags);
commonring->flags = flags;
}
void brcmf_commonring_unlock(struct brcmf_commonring *commonring)
__releases(&commonring->lock)
{
spin_unlock_irqrestore(&commonring->lock, commonring->flags);
}
bool brcmf_commonring_write_available(struct brcmf_commonring *commonring)
{
u16 available;
bool retry = true;
again:
if (commonring->r_ptr <= commonring->w_ptr)
available = commonring->depth - commonring->w_ptr +
commonring->r_ptr;
else
available = commonring->r_ptr - commonring->w_ptr;
if (available > 1) {
if (!commonring->was_full)
return true;
if (available > commonring->depth / 8) {
commonring->was_full = false;
return true;
}
if (retry) {
if (commonring->cr_update_rptr)
commonring->cr_update_rptr(commonring->cr_ctx);
retry = false;
goto again;
}
return false;
}
if (retry) {
if (commonring->cr_update_rptr)
commonring->cr_update_rptr(commonring->cr_ctx);
retry = false;
goto again;
}
commonring->was_full = true;
return false;
}
void *brcmf_commonring_reserve_for_write(struct brcmf_commonring *commonring)
{
void *ret_ptr;
u16 available;
bool retry = true;
again:
if (commonring->r_ptr <= commonring->w_ptr)
available = commonring->depth - commonring->w_ptr +
commonring->r_ptr;
else
available = commonring->r_ptr - commonring->w_ptr;
if (available > 1) {
ret_ptr = commonring->buf_addr +
(commonring->w_ptr * commonring->item_len);
commonring->w_ptr++;
if (commonring->w_ptr == commonring->depth)
commonring->w_ptr = 0;
return ret_ptr;
}
if (retry) {
if (commonring->cr_update_rptr)
commonring->cr_update_rptr(commonring->cr_ctx);
retry = false;
goto again;
}
commonring->was_full = true;
return NULL;
}
void *
brcmf_commonring_reserve_for_write_multiple(struct brcmf_commonring *commonring,
u16 n_items, u16 *alloced)
{
void *ret_ptr;
u16 available;
bool retry = true;
again:
if (commonring->r_ptr <= commonring->w_ptr)
available = commonring->depth - commonring->w_ptr +
commonring->r_ptr;
else
available = commonring->r_ptr - commonring->w_ptr;
if (available > 1) {
ret_ptr = commonring->buf_addr +
(commonring->w_ptr * commonring->item_len);
*alloced = min_t(u16, n_items, available - 1);
if (*alloced + commonring->w_ptr > commonring->depth)
*alloced = commonring->depth - commonring->w_ptr;
commonring->w_ptr += *alloced;
if (commonring->w_ptr == commonring->depth)
commonring->w_ptr = 0;
return ret_ptr;
}
if (retry) {
if (commonring->cr_update_rptr)
commonring->cr_update_rptr(commonring->cr_ctx);
retry = false;
goto again;
}
commonring->was_full = true;
return NULL;
}
int brcmf_commonring_write_complete(struct brcmf_commonring *commonring)
{
void *address;
address = commonring->buf_addr;
address += (commonring->f_ptr * commonring->item_len);
if (commonring->f_ptr > commonring->w_ptr) {
brcmf_dma_flush(address,
(commonring->depth - commonring->f_ptr) *
commonring->item_len);
address = commonring->buf_addr;
commonring->f_ptr = 0;
}
brcmf_dma_flush(address, (commonring->w_ptr - commonring->f_ptr) *
commonring->item_len);
commonring->f_ptr = commonring->w_ptr;
if (commonring->cr_write_wptr)
commonring->cr_write_wptr(commonring->cr_ctx);
if (commonring->cr_ring_bell)
return commonring->cr_ring_bell(commonring->cr_ctx);
return -EIO;
}
void brcmf_commonring_write_cancel(struct brcmf_commonring *commonring,
u16 n_items)
{
if (commonring->w_ptr == 0)
commonring->w_ptr = commonring->depth - n_items;
else
commonring->w_ptr -= n_items;
}
void *brcmf_commonring_get_read_ptr(struct brcmf_commonring *commonring,
u16 *n_items)
{
void *ret_addr;
if (commonring->cr_update_wptr)
commonring->cr_update_wptr(commonring->cr_ctx);
*n_items = (commonring->w_ptr >= commonring->r_ptr) ?
(commonring->w_ptr - commonring->r_ptr) :
(commonring->depth - commonring->r_ptr);
if (*n_items == 0)
return NULL;
ret_addr = commonring->buf_addr +
(commonring->r_ptr * commonring->item_len);
commonring->r_ptr += *n_items;
if (commonring->r_ptr == commonring->depth)
commonring->r_ptr = 0;
brcmf_dma_invalidate_cache(ret_addr, *n_ items * commonring->item_len);
return ret_addr;
}
int brcmf_commonring_read_complete(struct brcmf_commonring *commonring)
{
if (commonring->cr_write_rptr)
return commonring->cr_write_rptr(commonring->cr_ctx);
return -EIO;
}
