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| 1 | +/* |
| 2 | + * Copyright 2008-2015 Freescale Semiconductor Inc. |
| 3 | + * |
| 4 | + * Redistribution and use in source and binary forms, with or without |
| 5 | + * modification, are permitted provided that the following conditions are met: |
| 6 | + * * Redistributions of source code must retain the above copyright |
| 7 | + * notice, this list of conditions and the following disclaimer. |
| 8 | + * * Redistributions in binary form must reproduce the above copyright |
| 9 | + * notice, this list of conditions and the following disclaimer in the |
| 10 | + * documentation and/or other materials provided with the distribution. |
| 11 | + * * Neither the name of Freescale Semiconductor nor the |
| 12 | + * names of its contributors may be used to endorse or promote products |
| 13 | + * derived from this software without specific prior written permission. |
| 14 | + * |
| 15 | + * |
| 16 | + * ALTERNATIVELY, this software may be distributed under the terms of the |
| 17 | + * GNU General Public License ("GPL") as published by the Free Software |
| 18 | + * Foundation, either version 2 of that License or (at your option) any |
| 19 | + * later version. |
| 20 | + * |
| 21 | + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY |
| 22 | + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 23 | + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY |
| 25 | + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 26 | + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 27 | + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 28 | + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 30 | + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | + */ |
| 32 | + |
| 33 | +#include "fman_muram.h" |
| 34 | + |
| 35 | +#include <linux/io.h> |
| 36 | +#include <linux/slab.h> |
| 37 | +#include <linux/genalloc.h> |
| 38 | + |
| 39 | +struct muram_info { |
| 40 | + struct gen_pool *pool; |
| 41 | + void __iomem *vbase; |
| 42 | + size_t size; |
| 43 | + phys_addr_t pbase; |
| 44 | +}; |
| 45 | + |
| 46 | +static unsigned long fman_muram_vbase_to_offset(struct muram_info *muram, |
| 47 | + unsigned long vaddr) |
| 48 | +{ |
| 49 | + return vaddr - (unsigned long)muram->vbase; |
| 50 | +} |
| 51 | + |
| 52 | +/** |
| 53 | + * fman_muram_init |
| 54 | + * @base: Pointer to base of memory mapped FM-MURAM. |
| 55 | + * @size: Size of the FM-MURAM partition. |
| 56 | + * |
| 57 | + * Creates partition in the MURAM. |
| 58 | + * The routine returns a pointer to the MURAM partition. |
| 59 | + * This pointer must be passed as to all other FM-MURAM function calls. |
| 60 | + * No actual initialization or configuration of FM_MURAM hardware is done by |
| 61 | + * this routine. |
| 62 | + * |
| 63 | + * Return: pointer to FM-MURAM object, or NULL for Failure. |
| 64 | + */ |
| 65 | +struct muram_info *fman_muram_init(phys_addr_t base, size_t size) |
| 66 | +{ |
| 67 | + struct muram_info *muram; |
| 68 | + void __iomem *vaddr; |
| 69 | + int ret; |
| 70 | + |
| 71 | + muram = kzalloc(sizeof(*muram), GFP_KERNEL); |
| 72 | + if (!muram) |
| 73 | + return NULL; |
| 74 | + |
| 75 | + muram->pool = gen_pool_create(ilog2(64), -1); |
| 76 | + if (!muram->pool) { |
| 77 | + pr_err("%s(): MURAM pool create failed\n", __func__); |
| 78 | + goto muram_free; |
| 79 | + } |
| 80 | + |
| 81 | + vaddr = ioremap(base, size); |
| 82 | + if (!vaddr) { |
| 83 | + pr_err("%s(): MURAM ioremap failed\n", __func__); |
| 84 | + goto pool_destroy; |
| 85 | + } |
| 86 | + |
| 87 | + ret = gen_pool_add_virt(muram->pool, (unsigned long)vaddr, |
| 88 | + base, size, -1); |
| 89 | + if (ret < 0) { |
| 90 | + pr_err("%s(): MURAM pool add failed\n", __func__); |
| 91 | + iounmap(vaddr); |
| 92 | + goto pool_destroy; |
| 93 | + } |
| 94 | + |
| 95 | + memset_io(vaddr, 0, (int)size); |
| 96 | + |
| 97 | + muram->vbase = vaddr; |
| 98 | + muram->pbase = base; |
| 99 | + return muram; |
| 100 | + |
| 101 | +pool_destroy: |
| 102 | + gen_pool_destroy(muram->pool); |
| 103 | +muram_free: |
| 104 | + kfree(muram); |
| 105 | + return NULL; |
| 106 | +} |
| 107 | + |
| 108 | +/** |
| 109 | + * fman_muram_offset_to_vbase |
| 110 | + * @muram: FM-MURAM module pointer. |
| 111 | + * @offset: the offset of the memory block |
| 112 | + * |
| 113 | + * Gives the address of the memory region from specific offset |
| 114 | + * |
| 115 | + * Return: The address of the memory block |
| 116 | + */ |
| 117 | +unsigned long fman_muram_offset_to_vbase(struct muram_info *muram, |
| 118 | + unsigned long offset) |
| 119 | +{ |
| 120 | + return offset + (unsigned long)muram->vbase; |
| 121 | +} |
| 122 | + |
| 123 | +/** |
| 124 | + * fman_muram_alloc |
| 125 | + * @muram: FM-MURAM module pointer. |
| 126 | + * @size: Size of the memory to be allocated. |
| 127 | + * |
| 128 | + * Allocate some memory from FM-MURAM partition. |
| 129 | + * |
| 130 | + * Return: address of the allocated memory; NULL otherwise. |
| 131 | + */ |
| 132 | +int fman_muram_alloc(struct muram_info *muram, size_t size) |
| 133 | +{ |
| 134 | + unsigned long vaddr; |
| 135 | + |
| 136 | + vaddr = gen_pool_alloc(muram->pool, size); |
| 137 | + if (!vaddr) |
| 138 | + return -ENOMEM; |
| 139 | + |
| 140 | + memset_io((void __iomem *)vaddr, 0, size); |
| 141 | + |
| 142 | + return fman_muram_vbase_to_offset(muram, vaddr); |
| 143 | +} |
| 144 | + |
| 145 | +/** |
| 146 | + * fman_muram_free_mem |
| 147 | + * muram: FM-MURAM module pointer. |
| 148 | + * offset: offset of the memory region to be freed. |
| 149 | + * size: size of the memory to be freed. |
| 150 | + * |
| 151 | + * Free an allocated memory from FM-MURAM partition. |
| 152 | + */ |
| 153 | +void fman_muram_free_mem(struct muram_info *muram, u32 offset, size_t size) |
| 154 | +{ |
| 155 | + unsigned long addr = fman_muram_offset_to_vbase(muram, offset); |
| 156 | + |
| 157 | + gen_pool_free(muram->pool, addr, size); |
| 158 | +} |
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