drivers/soc/fsl/qe/qe_common.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Common CPM code
   4  *
   5  * Author: Scott Wood <scottwood@freescale.com>
   6  *
   7  * Copyright 2007-2008,2010 Freescale Semiconductor, Inc.
   8  *
   9  * Some parts derived from commproc.c/cpm2_common.c, which is:
  10  * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
  11  * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
  12  * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
  13  * 2006 (c) MontaVista Software, Inc.
  14  * Vitaly Bordug <vbordug@ru.mvista.com>
  15  */
  16 #include <linux/genalloc.h>
  17 #include <linux/init.h>
  18 #include <linux/list.h>
  19 #include <linux/of_device.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/export.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/slab.h>
  25 #include <linux/io.h>
  26 #include <soc/fsl/qe/qe.h>
  27
  28 static struct gen_pool *muram_pool;
  29 static spinlock_t cpm_muram_lock;
  30 static u8 __iomem *muram_vbase;
  31 static phys_addr_t muram_pbase;
  32
  33 struct muram_block {
  34         struct list_head head;
  35         unsigned long start;
  36         int size;
  37 };
  38
  39 static LIST_HEAD(muram_block_list);
  40
  41 /* max address size we deal with */
  42 #define OF_MAX_ADDR_CELLS       4
  43 #define GENPOOL_OFFSET          (4096 * 8)
  44
  45 int cpm_muram_init(void)
  46 {
  47         struct device_node *np;
  48         struct resource r;
  49         u32 zero[OF_MAX_ADDR_CELLS] = {};
  50         resource_size_t max = 0;
  51         int i = 0;
  52         int ret = 0;
  53
  54         if (muram_pbase)
  55                 return 0;
  56
  57         spin_lock_init(&cpm_muram_lock);
  58         np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
  59         if (!np) {
  60                 /* try legacy bindings */
  61                 np = of_find_node_by_name(NULL, "data-only");
  62                 if (!np) {
  63                         pr_err("Cannot find CPM muram data node");
  64                         ret = -ENODEV;
  65                         goto out_muram;
  66                 }
  67         }
  68
  69         muram_pool = gen_pool_create(0, -1);
  70         if (!muram_pool) {
  71                 pr_err("Cannot allocate memory pool for CPM/QE muram");
  72                 ret = -ENOMEM;
  73                 goto out_muram;
  74         }
  75         muram_pbase = of_translate_address(np, zero);
  76         if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
  77                 pr_err("Cannot translate zero through CPM muram node");
  78                 ret = -ENODEV;
  79                 goto out_pool;
  80         }
  81
  82         while (of_address_to_resource(np, i++, &r) == 0) {
  83                 if (r.end > max)
  84                         max = r.end;
  85                 ret = gen_pool_add(muram_pool, r.start - muram_pbase +
  86                                    GENPOOL_OFFSET, resource_size(&r), -1);
  87                 if (ret) {
  88                         pr_err("QE: couldn't add muram to pool!\n");
  89                         goto out_pool;
  90                 }
  91         }
  92
  93         muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
  94         if (!muram_vbase) {
  95                 pr_err("Cannot map QE muram");
  96                 ret = -ENOMEM;
  97                 goto out_pool;
  98         }
  99         goto out_muram;
 100 out_pool:
 101         gen_pool_destroy(muram_pool);
 102 out_muram:
 103         of_node_put(np);
 104         return ret;
 105 }
 106
 107 /*
 108  * cpm_muram_alloc_common - cpm_muram_alloc common code
 109  * @size: number of bytes to allocate
 110  * @algo: algorithm for alloc.
 111  * @data: data for genalloc's algorithm.
 112  *
 113  * This function returns an offset into the muram area.
 114  */
 115 static unsigned long cpm_muram_alloc_common(unsigned long size,
 116                 genpool_algo_t algo, void *data)
 117 {
 118         struct muram_block *entry;
 119         unsigned long start;
 120
 121         if (!muram_pool && cpm_muram_init())
 122                 goto out2;
 123
 124         start = gen_pool_alloc_algo(muram_pool, size, algo, data);
 125         if (!start)
 126                 goto out2;
 127         start = start - GENPOOL_OFFSET;
 128         memset_io(cpm_muram_addr(start), 0, size);
 129         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 130         if (!entry)
 131                 goto out1;
 132         entry->start = start;
 133         entry->size = size;
 134         list_add(&entry->head, &muram_block_list);
 135
 136         return start;
 137 out1:
 138         gen_pool_free(muram_pool, start, size);
 139 out2:
 140         return (unsigned long)-ENOMEM;
 141 }
 142
 143 /*
 144  * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 145  * @size: number of bytes to allocate
 146  * @align: requested alignment, in bytes
 147  *
 148  * This function returns an offset into the muram area.
 149  * Use cpm_dpram_addr() to get the virtual address of the area.
 150  * Use cpm_muram_free() to free the allocation.
 151  */
 152 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
 153 {
 154         unsigned long start;
 155         unsigned long flags;
 156         struct genpool_data_align muram_pool_data;
 157
 158         spin_lock_irqsave(&cpm_muram_lock, flags);
 159         muram_pool_data.align = align;
 160         start = cpm_muram_alloc_common(size, gen_pool_first_fit_align,
 161                                        &muram_pool_data);
 162         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 163         return start;
 164 }
 165 EXPORT_SYMBOL(cpm_muram_alloc);
 166
 167 /**
 168  * cpm_muram_free - free a chunk of multi-user ram
 169  * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 170  */
 171 int cpm_muram_free(unsigned long offset)
 172 {
 173         unsigned long flags;
 174         int size;
 175         struct muram_block *tmp;
 176
 177         size = 0;
 178         spin_lock_irqsave(&cpm_muram_lock, flags);
 179         list_for_each_entry(tmp, &muram_block_list, head) {
 180                 if (tmp->start == offset) {
 181                         size = tmp->size;
 182                         list_del(&tmp->head);
 183                         kfree(tmp);
 184                         break;
 185                 }
 186         }
 187         gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
 188         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 189         return size;
 190 }
 191 EXPORT_SYMBOL(cpm_muram_free);
 192
 193 /*
 194  * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 195  * @offset: offset of allocation start address
 196  * @size: number of bytes to allocate
 197  * This function returns an offset into the muram area
 198  * Use cpm_dpram_addr() to get the virtual address of the area.
 199  * Use cpm_muram_free() to free the allocation.
 200  */
 201 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
 202 {
 203         unsigned long start;
 204         unsigned long flags;
 205         struct genpool_data_fixed muram_pool_data_fixed;
 206
 207         spin_lock_irqsave(&cpm_muram_lock, flags);
 208         muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
 209         start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc,
 210                                        &muram_pool_data_fixed);
 211         spin_unlock_irqrestore(&cpm_muram_lock, flags);
 212         return start;
 213 }
 214 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
 215
 216 /**
 217  * cpm_muram_addr - turn a muram offset into a virtual address
 218  * @offset: muram offset to convert
 219  */
 220 void __iomem *cpm_muram_addr(unsigned long offset)
 221 {
 222         return muram_vbase + offset;
 223 }
 224 EXPORT_SYMBOL(cpm_muram_addr);
 225
 226 unsigned long cpm_muram_offset(void __iomem *addr)
 227 {
 228         return addr - (void __iomem *)muram_vbase;
 229 }
 230 EXPORT_SYMBOL(cpm_muram_offset);
 231
 232 /**
 233  * cpm_muram_dma - turn a muram virtual address into a DMA address
 234  * @offset: virtual address from cpm_muram_addr() to convert
 235  */
 236 dma_addr_t cpm_muram_dma(void __iomem *addr)
 237 {
 238         return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
 239 }
 240 EXPORT_SYMBOL(cpm_muram_dma);