X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fnet%2Fwireless%2Fbrcm80211%2Fbrcmfmac%2Fcommonring.c;fp=kernel%2Fdrivers%2Fnet%2Fwireless%2Fbrcm80211%2Fbrcmfmac%2Fcommonring.c;h=77656c711bedbfc44a8a7ddf97b58cb3efabf24a;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/net/wireless/brcm80211/brcmfmac/commonring.c b/kernel/drivers/net/wireless/brcm80211/brcmfmac/commonring.c new file mode 100644 index 000000000..77656c711 --- /dev/null +++ b/kernel/drivers/net/wireless/brcm80211/brcmfmac/commonring.c @@ -0,0 +1,273 @@ +/* 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 +#include + +#include +#include + +#include "core.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; +}