xref: /openbmc/linux/arch/powerpc/sysdev/cpm_common.c (revision 22246614)
1 /*
2  * Common CPM code
3  *
4  * Author: Scott Wood <scottwood@freescale.com>
5  *
6  * Copyright 2007 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 
20 #include <linux/init.h>
21 #include <linux/of_device.h>
22 
23 #include <asm/udbg.h>
24 #include <asm/io.h>
25 #include <asm/system.h>
26 #include <asm/rheap.h>
27 #include <asm/cpm.h>
28 
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;
56 		udbg_putc('X');
57 	}
58 }
59 #endif
60 
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 
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 /**
193  * cpm_muram_dma - turn a muram virtual address into a DMA address
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);
201