1 /* 2 * Common CPM code 3 * 4 * Author: Scott Wood <scottwood@freescale.com> 5 * 6 * Copyright 2007-2008,2010 Freescale Semiconductor, Inc. 7 * 8 * Some parts derived from commproc.c/cpm2_common.c, which is: 9 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net) 10 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> 11 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) 12 * 2006 (c) MontaVista Software, Inc. 13 * Vitaly Bordug <vbordug@ru.mvista.com> 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of version 2 of the GNU General Public License as 17 * published by the Free Software Foundation. 18 */ 19 #include <linux/genalloc.h> 20 #include <linux/init.h> 21 #include <linux/list.h> 22 #include <linux/of_device.h> 23 #include <linux/spinlock.h> 24 #include <linux/export.h> 25 #include <linux/of.h> 26 #include <linux/of_address.h> 27 #include <linux/slab.h> 28 #include <linux/io.h> 29 #include <soc/fsl/qe/qe.h> 30 31 static struct gen_pool *muram_pool; 32 static spinlock_t cpm_muram_lock; 33 static u8 __iomem *muram_vbase; 34 static phys_addr_t muram_pbase; 35 36 struct muram_block { 37 struct list_head head; 38 unsigned long start; 39 int size; 40 }; 41 42 static LIST_HEAD(muram_block_list); 43 44 /* max address size we deal with */ 45 #define OF_MAX_ADDR_CELLS 4 46 #define GENPOOL_OFFSET (4096 * 8) 47 48 int cpm_muram_init(void) 49 { 50 struct device_node *np; 51 struct resource r; 52 u32 zero[OF_MAX_ADDR_CELLS] = {}; 53 resource_size_t max = 0; 54 int i = 0; 55 int ret = 0; 56 57 if (muram_pbase) 58 return 0; 59 60 spin_lock_init(&cpm_muram_lock); 61 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); 62 if (!np) { 63 /* try legacy bindings */ 64 np = of_find_node_by_name(NULL, "data-only"); 65 if (!np) { 66 pr_err("Cannot find CPM muram data node"); 67 ret = -ENODEV; 68 goto out_muram; 69 } 70 } 71 72 muram_pool = gen_pool_create(0, -1); 73 muram_pbase = of_translate_address(np, zero); 74 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { 75 pr_err("Cannot translate zero through CPM muram node"); 76 ret = -ENODEV; 77 goto out_pool; 78 } 79 80 while (of_address_to_resource(np, i++, &r) == 0) { 81 if (r.end > max) 82 max = r.end; 83 ret = gen_pool_add(muram_pool, r.start - muram_pbase + 84 GENPOOL_OFFSET, resource_size(&r), -1); 85 if (ret) { 86 pr_err("QE: couldn't add muram to pool!\n"); 87 goto out_pool; 88 } 89 } 90 91 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); 92 if (!muram_vbase) { 93 pr_err("Cannot map QE muram"); 94 ret = -ENOMEM; 95 goto out_pool; 96 } 97 goto out_muram; 98 out_pool: 99 gen_pool_destroy(muram_pool); 100 out_muram: 101 of_node_put(np); 102 return ret; 103 } 104 105 /* 106 * cpm_muram_alloc_common - cpm_muram_alloc common code 107 * @size: number of bytes to allocate 108 * @algo: algorithm for alloc. 109 * @data: data for genalloc's algorithm. 110 * 111 * This function returns an offset into the muram area. 112 */ 113 static unsigned long cpm_muram_alloc_common(unsigned long size, 114 genpool_algo_t algo, void *data) 115 { 116 struct muram_block *entry; 117 unsigned long start; 118 119 start = gen_pool_alloc_algo(muram_pool, size, algo, data); 120 if (!start) 121 goto out2; 122 start = start - GENPOOL_OFFSET; 123 memset_io(cpm_muram_addr(start), 0, size); 124 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 125 if (!entry) 126 goto out1; 127 entry->start = start; 128 entry->size = size; 129 list_add(&entry->head, &muram_block_list); 130 131 return start; 132 out1: 133 gen_pool_free(muram_pool, start, size); 134 out2: 135 return (unsigned long)-ENOMEM; 136 } 137 138 /* 139 * cpm_muram_alloc - allocate the requested size worth of multi-user ram 140 * @size: number of bytes to allocate 141 * @align: requested alignment, in bytes 142 * 143 * This function returns an offset into the muram area. 144 * Use cpm_dpram_addr() to get the virtual address of the area. 145 * Use cpm_muram_free() to free the allocation. 146 */ 147 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) 148 { 149 unsigned long start; 150 unsigned long flags; 151 struct genpool_data_align muram_pool_data; 152 153 spin_lock_irqsave(&cpm_muram_lock, flags); 154 muram_pool_data.align = align; 155 start = cpm_muram_alloc_common(size, gen_pool_first_fit_align, 156 &muram_pool_data); 157 spin_unlock_irqrestore(&cpm_muram_lock, flags); 158 return start; 159 } 160 EXPORT_SYMBOL(cpm_muram_alloc); 161 162 /** 163 * cpm_muram_free - free a chunk of multi-user ram 164 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 165 */ 166 int cpm_muram_free(unsigned long offset) 167 { 168 unsigned long flags; 169 int size; 170 struct muram_block *tmp; 171 172 size = 0; 173 spin_lock_irqsave(&cpm_muram_lock, flags); 174 list_for_each_entry(tmp, &muram_block_list, head) { 175 if (tmp->start == offset) { 176 size = tmp->size; 177 list_del(&tmp->head); 178 kfree(tmp); 179 break; 180 } 181 } 182 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); 183 spin_unlock_irqrestore(&cpm_muram_lock, flags); 184 return size; 185 } 186 EXPORT_SYMBOL(cpm_muram_free); 187 188 /* 189 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 190 * @offset: offset of allocation start address 191 * @size: number of bytes to allocate 192 * This function returns an offset into the muram area 193 * Use cpm_dpram_addr() to get the virtual address of the area. 194 * Use cpm_muram_free() to free the allocation. 195 */ 196 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 197 { 198 unsigned long start; 199 unsigned long flags; 200 struct genpool_data_fixed muram_pool_data_fixed; 201 202 spin_lock_irqsave(&cpm_muram_lock, flags); 203 muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; 204 start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc, 205 &muram_pool_data_fixed); 206 spin_unlock_irqrestore(&cpm_muram_lock, flags); 207 return start; 208 } 209 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 210 211 /** 212 * cpm_muram_addr - turn a muram offset into a virtual address 213 * @offset: muram offset to convert 214 */ 215 void __iomem *cpm_muram_addr(unsigned long offset) 216 { 217 return muram_vbase + offset; 218 } 219 EXPORT_SYMBOL(cpm_muram_addr); 220 221 unsigned long cpm_muram_offset(void __iomem *addr) 222 { 223 return addr - (void __iomem *)muram_vbase; 224 } 225 EXPORT_SYMBOL(cpm_muram_offset); 226 227 /** 228 * cpm_muram_dma - turn a muram virtual address into a DMA address 229 * @offset: virtual address from cpm_muram_addr() to convert 230 */ 231 dma_addr_t cpm_muram_dma(void __iomem *addr) 232 { 233 return muram_pbase + ((u8 __iomem *)addr - muram_vbase); 234 } 235 EXPORT_SYMBOL(cpm_muram_dma); 236