drivers/soc/fsl/qe/qe_common.c

   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         if (!muram_pool) {
  74                 pr_err("Cannot allocate memory pool for CPM/QE muram");
  75                 ret = -ENOMEM;
  76                 goto out_muram;
  77         }
  78         muram_pbase = of_translate_address(np, zero);
  79         if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
  80                 pr_err("Cannot translate zero through CPM muram node");
  81                 ret = -ENODEV;
  82                 goto out_pool;
  83         }
  84
  85         while (of_address_to_resource(np, i++, &r) == 0) {
  86                 if (r.end > max)
  87                         max = r.end;
  88                 ret = gen_pool_add(muram_pool, r.start - muram_pbase +
  89                                    GENPOOL_OFFSET, resource_size(&r), -1);
  90                 if (ret) {
  91                         pr_err("QE: couldn't add muram to pool!\n");
  92                         goto out_pool;
  93                 }
  94         }
  95
  96         muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
  97         if (!muram_vbase) {
  98                 pr_err("Cannot map QE muram");
  99                 ret = -ENOMEM;
 100                 goto out_pool;
 101         }
 102         goto out_muram;
 103 out_pool:
 104         gen_pool_destroy(muram_pool);
 105 out_muram:
 106         of_node_put(np);
 107         return ret;
 108 }
 109
 110 /*
 111  * cpm_muram_alloc_common - cpm_muram_alloc common code
 112  * @size: number of bytes to allocate
 113  * @algo: algorithm for alloc.
 114  * @data: data for genalloc's algorithm.
 115  *
 116  * This function returns an offset into the muram area.
 117  */
 118 static unsigned long cpm_muram_alloc_common(unsigned long size,
 119                 genpool_algo_t algo, void *data)
 120 {
 121         struct muram_block *entry;
 122         unsigned long start;
 123
 124         if (!muram_pool && cpm_muram_init())
 125                 goto out2;
 126
 127         start = gen_pool_alloc_algo(muram_pool, size, algo, data);
 128         if (!start)
 129                 goto out2;
 130         start = start - GENPOOL_OFFSET;
 131         memset_io(cpm_muram_addr(start), 0, size);
 132         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 133         if (!entry)
 134                 goto out1;
 135         entry->start = start;
 136         entry->size = size;
 137         list_add(&entry->head, &muram_block_list);
 138
 139         return start;
 140 out1:
 141         gen_pool_free(muram_pool, start, size);
 142 out2:
 143         return (unsigned long)-ENOMEM;
 144 }
 145
 146 /*
 147  * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 148  * @size: number of bytes to allocate
 149  * @align: requested alignment, in bytes
 150  *
 151  * This function returns an offset into the muram area.
 152  * Use cpm_dpram_addr() to get the virtual address of the area.
 153  * Use cpm_muram_free() to free the allocation.
 154  */
 155 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
 156 {
 157         unsigned long start;
 158         unsigned long flags;
 159         struct genpool_data_align muram_pool_data;
 160
 161         spin_lock_irqsave(&cpm_muram_lock, flags);
 162         muram_pool_data.align = align;
 163         start = cpm_muram_alloc_common(size, gen_pool_first_fit_align,
 164                                        &muram_pool_data);
 165         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 166         return start;
 167 }
 168 EXPORT_SYMBOL(cpm_muram_alloc);
 169
 170 /**
 171  * cpm_muram_free - free a chunk of multi-user ram
 172  * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 173  */
 174 int cpm_muram_free(unsigned long offset)
 175 {
 176         unsigned long flags;
 177         int size;
 178         struct muram_block *tmp;
 179
 180         size = 0;
 181         spin_lock_irqsave(&cpm_muram_lock, flags);
 182         list_for_each_entry(tmp, &muram_block_list, head) {
 183                 if (tmp->start == offset) {
 184                         size = tmp->size;
 185                         list_del(&tmp->head);
 186                         kfree(tmp);
 187                         break;
 188                 }
 189         }
 190         gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
 191         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 192         return size;
 193 }
 194 EXPORT_SYMBOL(cpm_muram_free);
 195
 196 /*
 197  * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 198  * @offset: offset of allocation start address
 199  * @size: number of bytes to allocate
 200  * This function returns an offset into the muram area
 201  * Use cpm_dpram_addr() to get the virtual address of the area.
 202  * Use cpm_muram_free() to free the allocation.
 203  */
 204 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
 205 {
 206         unsigned long start;
 207         unsigned long flags;
 208         struct genpool_data_fixed muram_pool_data_fixed;
 209
 210         spin_lock_irqsave(&cpm_muram_lock, flags);
 211         muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
 212         start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc,
 213                                        &muram_pool_data_fixed);
 214         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 215         return start;
 216 }
 217 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
 218
 219 /**
 220  * cpm_muram_addr - turn a muram offset into a virtual address
 221  * @offset: muram offset to convert
 222  */
 223 void __iomem *cpm_muram_addr(unsigned long offset)
 224 {
 225         return muram_vbase + offset;
 226 }
 227 EXPORT_SYMBOL(cpm_muram_addr);
 228
 229 unsigned long cpm_muram_offset(void __iomem *addr)
 230 {
 231         return addr - (void __iomem *)muram_vbase;
 232 }
 233 EXPORT_SYMBOL(cpm_muram_offset);
 234
 235 /**
 236  * cpm_muram_dma - turn a muram virtual address into a DMA address
 237  * @offset: virtual address from cpm_muram_addr() to convert
 238  */
 239 dma_addr_t cpm_muram_dma(void __iomem *addr)
 240 {
 241         return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
 242 }
 243 EXPORT_SYMBOL(cpm_muram_dma);