mirror of https://gitee.com/openkylin/linux.git
355 lines
12 KiB
C
355 lines
12 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "host.h"
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#include "unsolicited_frame_control.h"
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#include "registers.h"
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/**
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* This method will program the unsolicited frames (UFs) into the UF address
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* table and construct the UF frame structure being modeled in the core. It
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* will handle the case where some of the UFs are not being used and thus
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* should have entries programmed to zero in the address table.
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* @uf_control: This parameter specifies the unsolicted frame control object
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* for which to construct the unsolicited frames objects.
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* @uf_buffer_phys_address: This parameter specifies the physical address for
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* the first unsolicited frame buffer.
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* @uf_buffer_virt_address: This parameter specifies the virtual address for
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* the first unsolicited frame buffer.
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* @unused_uf_header_entries: This parameter specifies the number of unused UF
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* headers. This value can be non-zero when there are a non-power of 2
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* number of unsolicited frames being supported.
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* @used_uf_header_entries: This parameter specifies the number of actually
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* utilized UF headers.
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*
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*/
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static void scic_sds_unsolicited_frame_control_construct_frames(
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struct scic_sds_unsolicited_frame_control *uf_control,
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dma_addr_t uf_buffer_phys_address,
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void *uf_buffer_virt_address,
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u32 unused_uf_header_entries,
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u32 used_uf_header_entries)
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{
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u32 index;
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struct scic_sds_unsolicited_frame *uf;
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/*
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* Program the unused buffers into the UF address table and the
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* controller's array of UFs.
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*/
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for (index = 0; index < unused_uf_header_entries; index++) {
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uf = &uf_control->buffers.array[index];
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uf->buffer = NULL;
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uf_control->address_table.array[index] = 0;
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uf->header = &uf_control->headers.array[index];
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uf->state = UNSOLICITED_FRAME_EMPTY;
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}
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/*
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* Program the actual used UF buffers into the UF address table and
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* the controller's array of UFs.
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*/
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for (index = unused_uf_header_entries;
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index < unused_uf_header_entries + used_uf_header_entries;
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index++) {
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uf = &uf_control->buffers.array[index];
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uf_control->address_table.array[index] = uf_buffer_phys_address;
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uf->buffer = uf_buffer_virt_address;
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uf->header = &uf_control->headers.array[index];
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uf->state = UNSOLICITED_FRAME_EMPTY;
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/*
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* Increment the address of the physical and virtual memory
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* pointers. Everything is aligned on 1k boundary with an
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* increment of 1k.
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*/
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uf_buffer_virt_address += SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
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uf_buffer_phys_address += SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
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}
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}
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int scic_sds_unsolicited_frame_control_construct(struct scic_sds_controller *scic)
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{
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struct scic_sds_unsolicited_frame_control *uf_control = &scic->uf_control;
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u32 unused_uf_header_entries;
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u32 used_uf_header_entries;
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u32 used_uf_buffer_bytes;
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u32 unused_uf_header_bytes;
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u32 used_uf_header_bytes;
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dma_addr_t uf_buffer_phys_address;
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void *uf_buffer_virt_address;
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size_t size;
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/*
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* The UF buffer address table size must be programmed to a power
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* of 2. Find the first power of 2 that is equal to or greater then
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* the number of unsolicited frame buffers to be utilized.
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*/
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uf_control->address_table.count = SCU_MIN_UF_TABLE_ENTRIES;
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while (uf_control->address_table.count < uf_control->buffers.count &&
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uf_control->address_table.count < SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES)
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uf_control->address_table.count <<= 1;
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/*
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* Prepare all of the memory sizes for the UF headers, UF address
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* table, and UF buffers themselves.
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*/
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used_uf_buffer_bytes = uf_control->buffers.count
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* SCU_UNSOLICITED_FRAME_BUFFER_SIZE;
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unused_uf_header_entries = uf_control->address_table.count
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- uf_control->buffers.count;
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used_uf_header_entries = uf_control->buffers.count;
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unused_uf_header_bytes = unused_uf_header_entries
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* sizeof(struct scu_unsolicited_frame_header);
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used_uf_header_bytes = used_uf_header_entries
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* sizeof(struct scu_unsolicited_frame_header);
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size = used_uf_buffer_bytes + used_uf_header_bytes +
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uf_control->address_table.count * sizeof(dma_addr_t);
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/*
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* The Unsolicited Frame buffers are set at the start of the UF
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* memory descriptor entry. The headers and address table will be
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* placed after the buffers.
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*/
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uf_buffer_virt_address = dmam_alloc_coherent(scic_to_dev(scic), size,
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&uf_buffer_phys_address, GFP_KERNEL);
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if (!uf_buffer_virt_address)
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return -ENOMEM;
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/*
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* Program the location of the UF header table into the SCU.
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* Notes:
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* - The address must align on a 64-byte boundary. Guaranteed to be
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* on 64-byte boundary already 1KB boundary for unsolicited frames.
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* - Program unused header entries to overlap with the last
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* unsolicited frame. The silicon will never DMA to these unused
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* headers, since we program the UF address table pointers to
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* NULL.
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*/
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uf_control->headers.physical_address =
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uf_buffer_phys_address +
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used_uf_buffer_bytes -
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unused_uf_header_bytes;
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uf_control->headers.array =
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uf_buffer_virt_address +
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used_uf_buffer_bytes -
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unused_uf_header_bytes;
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/*
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* Program the location of the UF address table into the SCU.
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* Notes:
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* - The address must align on a 64-bit boundary. Guaranteed to be on 64
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* byte boundary already due to above programming headers being on a
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* 64-bit boundary and headers are on a 64-bytes in size.
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*/
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uf_control->address_table.physical_address =
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uf_buffer_phys_address +
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used_uf_buffer_bytes +
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used_uf_header_bytes;
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uf_control->address_table.array =
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uf_buffer_virt_address +
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used_uf_buffer_bytes +
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used_uf_header_bytes;
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uf_control->get = 0;
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/*
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* UF buffer requirements are:
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* - The last entry in the UF queue is not NULL.
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* - There is a power of 2 number of entries (NULL or not-NULL)
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* programmed into the queue.
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* - Aligned on a 1KB boundary. */
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/*
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* If the user provided less then the maximum amount of memory,
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* then be sure that we programm the first entries in the UF
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* address table to NULL. */
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scic_sds_unsolicited_frame_control_construct_frames(
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uf_control,
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uf_buffer_phys_address,
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uf_buffer_virt_address,
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unused_uf_header_entries,
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used_uf_header_entries
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);
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return 0;
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}
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/**
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* This method returns the frame header for the specified frame index.
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* @uf_control:
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* @frame_index:
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* @frame_header:
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*
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* enum sci_status
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*/
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enum sci_status scic_sds_unsolicited_frame_control_get_header(
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struct scic_sds_unsolicited_frame_control *uf_control,
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u32 frame_index,
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void **frame_header)
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{
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if (frame_index < uf_control->address_table.count) {
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/*
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* Skip the first word in the frame since this is a controll word used
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* by the hardware. */
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*frame_header = &uf_control->buffers.array[frame_index].header->data;
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return SCI_SUCCESS;
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}
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return SCI_FAILURE_INVALID_PARAMETER_VALUE;
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}
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/**
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* This method returns the frame buffer for the specified frame index.
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* @uf_control:
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* @frame_index:
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* @frame_buffer:
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*
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* enum sci_status
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*/
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enum sci_status scic_sds_unsolicited_frame_control_get_buffer(
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struct scic_sds_unsolicited_frame_control *uf_control,
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u32 frame_index,
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void **frame_buffer)
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{
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if (frame_index < uf_control->address_table.count) {
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*frame_buffer = uf_control->buffers.array[frame_index].buffer;
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return SCI_SUCCESS;
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}
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return SCI_FAILURE_INVALID_PARAMETER_VALUE;
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}
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/**
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* This method releases the frame once this is done the frame is available for
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* re-use by the hardware. The data contained in the frame header and frame
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* buffer is no longer valid.
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* @uf_control: This parameter specifies the UF control object
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* @frame_index: This parameter specifies the frame index to attempt to release.
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*
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* This method returns an indication to the caller as to whether the
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* unsolicited frame get pointer should be updated.
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*/
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bool scic_sds_unsolicited_frame_control_release_frame(
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struct scic_sds_unsolicited_frame_control *uf_control,
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u32 frame_index)
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{
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u32 frame_get;
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u32 frame_cycle;
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frame_get = uf_control->get & (uf_control->address_table.count - 1);
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frame_cycle = uf_control->get & uf_control->address_table.count;
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/*
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* In the event there are NULL entries in the UF table, we need to
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* advance the get pointer in order to find out if this frame should
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* be released (i.e. update the get pointer). */
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while (((lower_32_bits(uf_control->address_table.array[frame_get])
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== 0) &&
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(upper_32_bits(uf_control->address_table.array[frame_get])
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== 0)) &&
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(frame_get < uf_control->address_table.count))
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frame_get++;
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/*
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* The table has a NULL entry as it's last element. This is
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* illegal. */
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BUG_ON(frame_get >= uf_control->address_table.count);
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if (frame_index < uf_control->address_table.count) {
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uf_control->buffers.array[frame_index].state = UNSOLICITED_FRAME_RELEASED;
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/*
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* The frame index is equal to the current get pointer so we
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* can now free up all of the frame entries that */
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if (frame_get == frame_index) {
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while (
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uf_control->buffers.array[frame_get].state
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== UNSOLICITED_FRAME_RELEASED
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) {
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uf_control->buffers.array[frame_get].state = UNSOLICITED_FRAME_EMPTY;
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INCREMENT_QUEUE_GET(
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frame_get,
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frame_cycle,
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uf_control->address_table.count - 1,
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uf_control->address_table.count
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);
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}
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uf_control->get =
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(SCU_UFQGP_GEN_BIT(ENABLE_BIT) | frame_cycle | frame_get);
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return true;
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} else {
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/*
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* Frames remain in use until we advance the get pointer
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* so there is nothing we can do here */
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}
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}
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return false;
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}
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