hw/qib/qib_pio_copy.c

0001 /*
0002  * Copyright (c) 2009 QLogic Corporation. All rights reserved.
0003  *
0004  * This software is available to you under a choice of one of two
0005  * licenses.  You may choose to be licensed under the terms of the GNU
0006  * General Public License (GPL) Version 2, available from the file
0007  * COPYING in the main directory of this source tree, or the
0008  * OpenIB.org BSD license below:
0009  *
0010  *     Redistribution and use in source and binary forms, with or
0011  *     without modification, are permitted provided that the following
0012  *     conditions are met:
0013  *
0014  *      - Redistributions of source code must retain the above
0015  *        copyright notice, this list of conditions and the following
0016  *        disclaimer.
0017  *
0018  *      - Redistributions in binary form must reproduce the above
0019  *        copyright notice, this list of conditions and the following
0020  *        disclaimer in the documentation and/or other materials
0021  *        provided with the distribution.
0022  *
0023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0024  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0025  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0026  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0027  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0028  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0029  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0030  * SOFTWARE.
0031  */
0032
0033 #include "qib.h"
0034
0035 /**
0036  * qib_pio_copy - copy data to MMIO space, in multiples of 32-bits
0037  * @to: destination, in MMIO space (must be 64-bit aligned)
0038  * @from: source (must be 64-bit aligned)
0039  * @count: number of 32-bit quantities to copy
0040  *
0041  * Copy data from kernel space to MMIO space, in multiples of 32 bits at a
0042  * time.  Order of access is not guaranteed, nor is a memory barrier
0043  * performed afterwards.
0044  */
0045 void qib_pio_copy(void __iomem *to, const void *from, size_t count)
0046 {
0047 #ifdef CONFIG_64BIT
0048     u64 __iomem *dst = to;
0049     const u64 *src = from;
0050     const u64 *end = src + (count >> 1);
0051
0052     while (src < end)
0053         __raw_writeq(*src++, dst++);
0054     if (count & 1)
0055         __raw_writel(*(const u32 *)src, dst);
0056 #else
0057     u32 __iomem *dst = to;
0058     const u32 *src = from;
0059     const u32 *end = src + count;
0060
0061     while (src < end)
0062         __raw_writel(*src++, dst++);
0063 #endif
0064 }