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Release 4.11 drivers/net/wireless/broadcom/brcm80211/brcmfmac/commonring.c

/* 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 "core.h"
#include "commonring.h"


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; }

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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; }

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void brcmf_commonring_lock(struct brcmf_commonring *commonring) __acquires(&commonring->lock

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) { unsigned long flags; spin_lock_irqsave(&commonring->lock, flags); commonring->flags = flags; }
void brcmf_commonring_unlock(struct brcmf_commonring *commonring) __releases(&commonring->lock

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) { 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; }

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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; }

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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; }

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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) { address = commonring->buf_addr; commonring->f_ptr = 0; } 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; }

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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; }

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void *brcmf_commonring_get_read_ptr(struct brcmf_commonring *commonring, u16 *n_items) { 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; return commonring->buf_addr + (commonring->r_ptr * commonring->item_len); }

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int brcmf_commonring_read_complete(struct brcmf_commonring *commonring, u16 n_items) { commonring->r_ptr += n_items; if (commonring->r_ptr == commonring->depth) commonring->r_ptr = 0; if (commonring->cr_write_rptr) return commonring->cr_write_rptr(commonring->cr_ctx); return -EIO; }

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