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         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);