4 * Author: Scott Wood <scottwood@freescale.com>
6 * Copyright 2007 Freescale Semiconductor, Inc.
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>
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.
20 #include <linux/init.h>
21 #include <linux/of_device.h>
25 #include <asm/system.h>
26 #include <asm/rheap.h>
29 #include <mm/mmu_decl.h>
31 #ifdef CONFIG_PPC_EARLY_DEBUG_CPM
32 static u32 __iomem *cpm_udbg_txdesc =
33 (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
35 static void udbg_putc_cpm(char c)
37 u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
42 while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
46 out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
49 void __init udbg_init_cpm(void)
51 if (cpm_udbg_txdesc) {
53 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
55 udbg_putc = udbg_putc_cpm;
61 static spinlock_t cpm_muram_lock;
62 static rh_block_t cpm_boot_muram_rh_block[16];
63 static rh_info_t cpm_muram_info;
64 static u8 __iomem *muram_vbase;
65 static phys_addr_t muram_pbase;
67 /* Max address size we deal with */
68 #define OF_MAX_ADDR_CELLS 4
70 int __init cpm_muram_init(void)
72 struct device_node *np;
74 u32 zero[OF_MAX_ADDR_CELLS] = {};
75 resource_size_t max = 0;
79 spin_lock_init(&cpm_muram_lock);
80 /* initialize the info header */
81 rh_init(&cpm_muram_info, 1,
82 sizeof(cpm_boot_muram_rh_block) /
83 sizeof(cpm_boot_muram_rh_block[0]),
84 cpm_boot_muram_rh_block);
86 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
88 /* try legacy bindings */
89 np = of_find_node_by_name(NULL, "data-only");
91 printk(KERN_ERR "Cannot find CPM muram data node");
97 muram_pbase = of_translate_address(np, zero);
98 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
99 printk(KERN_ERR "Cannot translate zero through CPM muram node");
104 while (of_address_to_resource(np, i++, &r) == 0) {
108 rh_attach_region(&cpm_muram_info, r.start - muram_pbase,
109 r.end - r.start + 1);
112 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
114 printk(KERN_ERR "Cannot map CPM muram");
124 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
125 * @size: number of bytes to allocate
126 * @align: requested alignment, in bytes
128 * This function returns an offset into the muram area.
129 * Use cpm_dpram_addr() to get the virtual address of the area.
130 * Use cpm_muram_free() to free the allocation.
132 unsigned long cpm_muram_alloc(unsigned long size, unsigned long align)
137 spin_lock_irqsave(&cpm_muram_lock, flags);
138 cpm_muram_info.alignment = align;
139 start = rh_alloc(&cpm_muram_info, size, "commproc");
140 spin_unlock_irqrestore(&cpm_muram_lock, flags);
144 EXPORT_SYMBOL(cpm_muram_alloc);
147 * cpm_muram_free - free a chunk of multi-user ram
148 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
150 int cpm_muram_free(unsigned long offset)
155 spin_lock_irqsave(&cpm_muram_lock, flags);
156 ret = rh_free(&cpm_muram_info, offset);
157 spin_unlock_irqrestore(&cpm_muram_lock, flags);
161 EXPORT_SYMBOL(cpm_muram_free);
164 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
165 * @offset: the offset into the muram area to reserve
166 * @size: the number of bytes to reserve
168 * This function returns "start" on success, -ENOMEM on failure.
169 * Use cpm_dpram_addr() to get the virtual address of the area.
170 * Use cpm_muram_free() to free the allocation.
172 unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
177 spin_lock_irqsave(&cpm_muram_lock, flags);
178 cpm_muram_info.alignment = 1;
179 start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc");
180 spin_unlock_irqrestore(&cpm_muram_lock, flags);
184 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
187 * cpm_muram_addr - turn a muram offset into a virtual address
188 * @offset: muram offset to convert
190 void __iomem *cpm_muram_addr(unsigned long offset)
192 return muram_vbase + offset;
194 EXPORT_SYMBOL(cpm_muram_addr);
196 unsigned long cpm_muram_offset(void __iomem *addr)
198 return addr - (void __iomem *)muram_vbase;
200 EXPORT_SYMBOL(cpm_muram_offset);
203 * cpm_muram_dma - turn a muram virtual address into a DMA address
204 * @offset: virtual address from cpm_muram_addr() to convert
206 dma_addr_t cpm_muram_dma(void __iomem *addr)
208 return muram_pbase + ((u8 __iomem *)addr - muram_vbase);
210 EXPORT_SYMBOL(cpm_muram_dma);