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1/*2 * Copyright (c) 2004 Topspin Communications. All rights reserved.3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.5 *6 * This software is available to you under a choice of one of two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * provided with the distribution.24 *25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34 35#include <linux/types.h>36 37#define MTHCA_RD_DOORBELL 0x0038#define MTHCA_SEND_DOORBELL 0x1039#define MTHCA_RECEIVE_DOORBELL 0x1840#define MTHCA_CQ_DOORBELL 0x2041#define MTHCA_EQ_DOORBELL 0x2842 43#if BITS_PER_LONG == 6444/*45 * Assume that we can just write a 64-bit doorbell atomically. s39046 * actually doesn't have writeq() but S/390 systems don't even have47 * PCI so we won't worry about it.48 */49 50#define MTHCA_DECLARE_DOORBELL_LOCK(name)51#define MTHCA_INIT_DOORBELL_LOCK(ptr) do { } while (0)52#define MTHCA_GET_DOORBELL_LOCK(ptr) (NULL)53 54static inline void mthca_write64_raw(__be64 val, void __iomem *dest)55{56 __raw_writeq((__force u64) val, dest);57}58 59static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest,60 spinlock_t *doorbell_lock)61{62 __raw_writeq((__force u64) cpu_to_be64((u64) hi << 32 | lo), dest);63}64 65static inline void mthca_write_db_rec(__be32 val[2], __be32 *db)66{67 *(u64 *) db = *(u64 *) val;68}69 70#else71 72/*73 * Just fall back to a spinlock to protect the doorbell if74 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit75 * MMIO writes.76 */77 78#define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name;79#define MTHCA_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr)80#define MTHCA_GET_DOORBELL_LOCK(ptr) (ptr)81 82static inline void mthca_write64_raw(__be64 val, void __iomem *dest)83{84 __raw_writel(((__force u32 *) &val)[0], dest);85 __raw_writel(((__force u32 *) &val)[1], dest + 4);86}87 88static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest,89 spinlock_t *doorbell_lock)90{91 unsigned long flags;92 93 hi = (__force u32) cpu_to_be32(hi);94 lo = (__force u32) cpu_to_be32(lo);95 96 spin_lock_irqsave(doorbell_lock, flags);97 __raw_writel(hi, dest);98 __raw_writel(lo, dest + 4);99 spin_unlock_irqrestore(doorbell_lock, flags);100}101 102static inline void mthca_write_db_rec(__be32 val[2], __be32 *db)103{104 db[0] = val[0];105 wmb();106 db[1] = val[1];107}108 109#endif110