1 /* 2 * Copyright 2006 PathScale, Inc. All Rights Reserved. 3 * 4 * This file is free software; you can redistribute it and/or modify 5 * it under the terms of version 2 of the GNU General Public License 6 * as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software Foundation, 15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 16 */ 17 18 #include <linux/export.h> 19 #include <linux/io.h> 20 21 /** 22 * __iowrite32_copy - copy data to MMIO space, in 32-bit units 23 * @to: destination, in MMIO space (must be 32-bit aligned) 24 * @from: source (must be 32-bit aligned) 25 * @count: number of 32-bit quantities to copy 26 * 27 * Copy data from kernel space to MMIO space, in units of 32 bits at a 28 * time. Order of access is not guaranteed, nor is a memory barrier 29 * performed afterwards. 30 */ 31 void __attribute__((weak)) __iowrite32_copy(void __iomem *to, 32 const void *from, 33 size_t count) 34 { 35 u32 __iomem *dst = to; 36 const u32 *src = from; 37 const u32 *end = src + count; 38 39 while (src < end) 40 __raw_writel(*src++, dst++); 41 } 42 EXPORT_SYMBOL_GPL(__iowrite32_copy); 43 44 /** 45 * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units 46 * @to: destination, in MMIO space (must be 64-bit aligned) 47 * @from: source (must be 64-bit aligned) 48 * @count: number of 64-bit quantities to copy 49 * 50 * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a 51 * time. Order of access is not guaranteed, nor is a memory barrier 52 * performed afterwards. 53 */ 54 void __attribute__((weak)) __iowrite64_copy(void __iomem *to, 55 const void *from, 56 size_t count) 57 { 58 #ifdef CONFIG_64BIT 59 u64 __iomem *dst = to; 60 const u64 *src = from; 61 const u64 *end = src + count; 62 63 while (src < end) 64 __raw_writeq(*src++, dst++); 65 #else 66 __iowrite32_copy(to, from, count * 2); 67 #endif 68 } 69 70 EXPORT_SYMBOL_GPL(__iowrite64_copy); 71