6 * Copyright 2007-2008,2010 Freescale Semiconductor, Inc.
8 * Some parts derived from commproc.c/cpm2_common.c, which is:
12 * 2006 (c) MontaVista Software, Inc.
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.
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>
26 #include <linux/of_address.h>
27 #include <linux/slab.h>
29 #include <soc/fsl/qe/qe.h>
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;
37 struct list_head head;
42 static LIST_HEAD(muram_block_list);
44 /* max address size we deal with */
45 #define OF_MAX_ADDR_CELLS 4
46 #define GENPOOL_OFFSET (4096 * 8)
48 int cpm_muram_init(void)
50 struct device_node *np;
52 u32 zero[OF_MAX_ADDR_CELLS] = {};
53 resource_size_t max = 0;
60 spin_lock_init(&cpm_muram_lock);
61 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
63 /* try legacy bindings */
64 np = of_find_node_by_name(NULL, "data-only");
66 pr_err("Cannot find CPM muram data node");
72 muram_pool = gen_pool_create(0, -1);
74 pr_err("Cannot allocate memory pool for CPM/QE muram");
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");
85 while (of_address_to_resource(np, i++, &r) == 0) {
88 ret = gen_pool_add(muram_pool, r.start - muram_pbase +
89 GENPOOL_OFFSET, resource_size(&r), -1);
91 pr_err("QE: couldn't add muram to pool!\n");
96 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
98 pr_err("Cannot map QE muram");
104 gen_pool_destroy(muram_pool);
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.
116 * This function returns an offset into the muram area.
118 static unsigned long cpm_muram_alloc_common(unsigned long size,
119 genpool_algo_t algo, void *data)
121 struct muram_block *entry;
124 if (!muram_pool && cpm_muram_init())
127 start = gen_pool_alloc_algo(muram_pool, size, algo, data);
130 start = start - GENPOOL_OFFSET;
131 memset_io(cpm_muram_addr(start), 0, size);
132 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
135 entry->start = start;
137 list_add(&entry->head, &muram_block_list);
141 gen_pool_free(muram_pool, start, size);
143 return (unsigned long)-ENOMEM;
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
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.
155 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
159 struct genpool_data_align muram_pool_data;
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,
165 spin_unlock_irqrestore(&cpm_muram_lock, flags);
168 EXPORT_SYMBOL(cpm_muram_alloc);
171 * cpm_muram_free - free a chunk of multi-user ram
172 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
174 int cpm_muram_free(unsigned long offset)
178 struct muram_block *tmp;
181 spin_lock_irqsave(&cpm_muram_lock, flags);
182 list_for_each_entry(tmp, &muram_block_list, head) {
183 if (tmp->start == offset) {
185 list_del(&tmp->head);
190 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
191 spin_unlock_irqrestore(&cpm_muram_lock, flags);
194 EXPORT_SYMBOL(cpm_muram_free);
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.
204 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
208 struct genpool_data_fixed muram_pool_data_fixed;
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);
217 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
220 * cpm_muram_addr - turn a muram offset into a virtual address
221 * @offset: muram offset to convert
223 void __iomem *cpm_muram_addr(unsigned long offset)
225 return muram_vbase + offset;
227 EXPORT_SYMBOL(cpm_muram_addr);
229 unsigned long cpm_muram_offset(void __iomem *addr)
231 return addr - (void __iomem *)muram_vbase;
233 EXPORT_SYMBOL(cpm_muram_offset);
236 * cpm_muram_dma - turn a muram virtual address into a DMA address
237 * @offset: virtual address from cpm_muram_addr() to convert
239 dma_addr_t cpm_muram_dma(void __iomem *addr)
241 return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
243 EXPORT_SYMBOL(cpm_muram_dma);