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 - allocate the requested size worth of multi-user ram 107 * @size: number of bytes to allocate 108 * @align: requested alignment, in bytes 109 * 110 * This function returns an offset into the muram area. 111 * Use cpm_dpram_addr() to get the virtual address of the area. 112 * Use cpm_muram_free() to free the allocation. 113 */ 114 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) 115 { 116 unsigned long start; 117 unsigned long flags; 118 struct genpool_data_align muram_pool_data; 119 120 spin_lock_irqsave(&cpm_muram_lock, flags); 121 muram_pool_data.align = align; 122 start = cpm_muram_alloc_common(size, gen_pool_first_fit_align, 123 &muram_pool_data); 124 spin_unlock_irqrestore(&cpm_muram_lock, flags); 125 return start; 126 } 127 EXPORT_SYMBOL(cpm_muram_alloc); 128 129 /** 130 * cpm_muram_free - free a chunk of multi-user ram 131 * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). 132 */ 133 int cpm_muram_free(unsigned long offset) 134 { 135 unsigned long flags; 136 int size; 137 struct muram_block *tmp; 138 139 size = 0; 140 spin_lock_irqsave(&cpm_muram_lock, flags); 141 list_for_each_entry(tmp, &muram_block_list, head) { 142 if (tmp->start == offset) { 143 size = tmp->size; 144 list_del(&tmp->head); 145 kfree(tmp); 146 break; 147 } 148 } 149 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); 150 spin_unlock_irqrestore(&cpm_muram_lock, flags); 151 return size; 152 } 153 EXPORT_SYMBOL(cpm_muram_free); 154 155 /* 156 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram 157 * @offset: offset of allocation start address 158 * @size: number of bytes to allocate 159 * This function returns an offset into the muram area 160 * Use cpm_dpram_addr() to get the virtual address of the area. 161 * Use cpm_muram_free() to free the allocation. 162 */ 163 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) 164 { 165 unsigned long start; 166 unsigned long flags; 167 struct genpool_data_fixed muram_pool_data_fixed; 168 169 spin_lock_irqsave(&cpm_muram_lock, flags); 170 muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; 171 start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc, 172 &muram_pool_data_fixed); 173 spin_unlock_irqrestore(&cpm_muram_lock, flags); 174 return start; 175 } 176 EXPORT_SYMBOL(cpm_muram_alloc_fixed); 177 178 /* 179 * cpm_muram_alloc_common - cpm_muram_alloc common code 180 * @size: number of bytes to allocate 181 * @algo: algorithm for alloc. 182 * @data: data for genalloc's algorithm. 183 * 184 * This function returns an offset into the muram area. 185 */ 186 unsigned long cpm_muram_alloc_common(unsigned long size, genpool_algo_t algo, 187 void *data) 188 { 189 struct muram_block *entry; 190 unsigned long start; 191 192 start = gen_pool_alloc_algo(muram_pool, size, algo, data); 193 if (!start) 194 goto out2; 195 start = start - GENPOOL_OFFSET; 196 memset_io(cpm_muram_addr(start), 0, size); 197 entry = kmalloc(sizeof(*entry), GFP_KERNEL); 198 if (!entry) 199 goto out1; 200 entry->start = start; 201 entry->size = size; 202 list_add(&entry->head, &muram_block_list); 203 204 return start; 205 out1: 206 gen_pool_free(muram_pool, start, size); 207 out2: 208 return (unsigned long)-ENOMEM; 209 } 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