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c374e00e SW |
1 | /* |
2 | * Common CPM code | |
3 | * | |
4 | * Author: Scott Wood <scottwood@freescale.com> | |
5 | * | |
6 | * Copyright 2007 Freescale Semiconductor, Inc. | |
7 | * | |
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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 | * | |
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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 | ||
20 | #include <linux/init.h> | |
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21 | #include <linux/of_device.h> |
22 | ||
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23 | #include <asm/udbg.h> |
24 | #include <asm/io.h> | |
25 | #include <asm/system.h> | |
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26 | #include <asm/rheap.h> |
27 | #include <asm/cpm.h> | |
28 | ||
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29 | #include <mm/mmu_decl.h> |
30 | ||
31 | #ifdef CONFIG_PPC_EARLY_DEBUG_CPM | |
32 | static u32 __iomem *cpm_udbg_txdesc = | |
33 | (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR; | |
34 | ||
35 | static void udbg_putc_cpm(char c) | |
36 | { | |
37 | u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]); | |
38 | ||
39 | if (c == '\n') | |
40 | udbg_putc('\r'); | |
41 | ||
42 | while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000) | |
43 | ; | |
44 | ||
45 | out_8(txbuf, c); | |
46 | out_be32(&cpm_udbg_txdesc[0], 0xa0000001); | |
47 | } | |
48 | ||
49 | void __init udbg_init_cpm(void) | |
50 | { | |
51 | if (cpm_udbg_txdesc) { | |
52 | #ifdef CONFIG_CPM2 | |
53 | setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO); | |
54 | #endif | |
55 | udbg_putc = udbg_putc_cpm; | |
15f8c604 | 56 | udbg_putc('X'); |
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57 | } |
58 | } | |
59 | #endif | |
15f8c604 | 60 | |
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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; | |
66 | ||
67 | /* Max address size we deal with */ | |
68 | #define OF_MAX_ADDR_CELLS 4 | |
69 | ||
70 | int __init cpm_muram_init(void) | |
71 | { | |
72 | struct device_node *np; | |
73 | struct resource r; | |
74 | u32 zero[OF_MAX_ADDR_CELLS] = {}; | |
75 | resource_size_t max = 0; | |
76 | int i = 0; | |
77 | int ret = 0; | |
78 | ||
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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); | |
85 | ||
86 | np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); | |
87 | if (!np) { | |
88 | printk(KERN_ERR "Cannot find CPM muram data node"); | |
89 | ret = -ENODEV; | |
90 | goto out; | |
91 | } | |
92 | ||
93 | muram_pbase = of_translate_address(np, zero); | |
94 | if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { | |
95 | printk(KERN_ERR "Cannot translate zero through CPM muram node"); | |
96 | ret = -ENODEV; | |
97 | goto out; | |
98 | } | |
99 | ||
100 | while (of_address_to_resource(np, i++, &r) == 0) { | |
101 | if (r.end > max) | |
102 | max = r.end; | |
103 | ||
104 | rh_attach_region(&cpm_muram_info, r.start - muram_pbase, | |
105 | r.end - r.start + 1); | |
106 | } | |
107 | ||
108 | muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); | |
109 | if (!muram_vbase) { | |
110 | printk(KERN_ERR "Cannot map CPM muram"); | |
111 | ret = -ENOMEM; | |
112 | } | |
113 | ||
114 | out: | |
115 | of_node_put(np); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | /** | |
120 | * cpm_muram_alloc - allocate the requested size worth of multi-user ram | |
121 | * @size: number of bytes to allocate | |
122 | * @align: requested alignment, in bytes | |
123 | * | |
124 | * This function returns an offset into the muram area. | |
125 | * Use cpm_dpram_addr() to get the virtual address of the area. | |
126 | * Use cpm_muram_free() to free the allocation. | |
127 | */ | |
128 | unsigned long cpm_muram_alloc(unsigned long size, unsigned long align) | |
129 | { | |
130 | unsigned long start; | |
131 | unsigned long flags; | |
132 | ||
133 | spin_lock_irqsave(&cpm_muram_lock, flags); | |
134 | cpm_muram_info.alignment = align; | |
135 | start = rh_alloc(&cpm_muram_info, size, "commproc"); | |
136 | spin_unlock_irqrestore(&cpm_muram_lock, flags); | |
137 | ||
138 | return start; | |
139 | } | |
140 | EXPORT_SYMBOL(cpm_muram_alloc); | |
141 | ||
142 | /** | |
143 | * cpm_muram_free - free a chunk of multi-user ram | |
144 | * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). | |
145 | */ | |
146 | int cpm_muram_free(unsigned long offset) | |
147 | { | |
148 | int ret; | |
149 | unsigned long flags; | |
150 | ||
151 | spin_lock_irqsave(&cpm_muram_lock, flags); | |
152 | ret = rh_free(&cpm_muram_info, offset); | |
153 | spin_unlock_irqrestore(&cpm_muram_lock, flags); | |
154 | ||
155 | return ret; | |
156 | } | |
157 | EXPORT_SYMBOL(cpm_muram_free); | |
158 | ||
159 | /** | |
160 | * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram | |
161 | * @offset: the offset into the muram area to reserve | |
162 | * @size: the number of bytes to reserve | |
163 | * | |
164 | * This function returns "start" on success, -ENOMEM on failure. | |
165 | * Use cpm_dpram_addr() to get the virtual address of the area. | |
166 | * Use cpm_muram_free() to free the allocation. | |
167 | */ | |
168 | unsigned long cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) | |
169 | { | |
170 | unsigned long start; | |
171 | unsigned long flags; | |
172 | ||
173 | spin_lock_irqsave(&cpm_muram_lock, flags); | |
174 | cpm_muram_info.alignment = 1; | |
175 | start = rh_alloc_fixed(&cpm_muram_info, offset, size, "commproc"); | |
176 | spin_unlock_irqrestore(&cpm_muram_lock, flags); | |
177 | ||
178 | return start; | |
179 | } | |
180 | EXPORT_SYMBOL(cpm_muram_alloc_fixed); | |
181 | ||
182 | /** | |
183 | * cpm_muram_addr - turn a muram offset into a virtual address | |
184 | * @offset: muram offset to convert | |
185 | */ | |
186 | void __iomem *cpm_muram_addr(unsigned long offset) | |
187 | { | |
188 | return muram_vbase + offset; | |
189 | } | |
190 | EXPORT_SYMBOL(cpm_muram_addr); | |
191 | ||
192 | /** | |
4c011b1f | 193 | * cpm_muram_dma - turn a muram virtual address into a DMA address |
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194 | * @offset: virtual address from cpm_muram_addr() to convert |
195 | */ | |
196 | dma_addr_t cpm_muram_dma(void __iomem *addr) | |
197 | { | |
198 | return muram_pbase + ((u8 __iomem *)addr - muram_vbase); | |
199 | } | |
200 | EXPORT_SYMBOL(cpm_muram_dma); |