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acaa7aa3 AV |
1 | /* |
2 | * Freescale LBC and UPM routines. | |
3 | * | |
4 | * Copyright (c) 2007-2008 MontaVista Software, Inc. | |
5 | * | |
6 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | */ | |
13 | ||
c0da99d5 AV |
14 | #include <linux/init.h> |
15 | #include <linux/module.h> | |
acaa7aa3 | 16 | #include <linux/kernel.h> |
c0da99d5 AV |
17 | #include <linux/compiler.h> |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/io.h> | |
acaa7aa3 | 21 | #include <linux/of.h> |
c0da99d5 | 22 | #include <asm/prom.h> |
acaa7aa3 AV |
23 | #include <asm/fsl_lbc.h> |
24 | ||
c0da99d5 AV |
25 | static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); |
26 | static struct fsl_lbc_regs __iomem *fsl_lbc_regs; | |
acaa7aa3 AV |
27 | |
28 | static char __initdata *compat_lbc[] = { | |
29 | "fsl,pq2-localbus", | |
30 | "fsl,pq2pro-localbus", | |
31 | "fsl,pq3-localbus", | |
32 | "fsl,elbc", | |
33 | }; | |
34 | ||
35 | static int __init fsl_lbc_init(void) | |
36 | { | |
37 | struct device_node *lbus; | |
38 | int i; | |
39 | ||
40 | for (i = 0; i < ARRAY_SIZE(compat_lbc); i++) { | |
41 | lbus = of_find_compatible_node(NULL, NULL, compat_lbc[i]); | |
42 | if (lbus) | |
43 | goto found; | |
44 | } | |
45 | return -ENODEV; | |
46 | ||
47 | found: | |
48 | fsl_lbc_regs = of_iomap(lbus, 0); | |
49 | of_node_put(lbus); | |
50 | if (!fsl_lbc_regs) | |
51 | return -ENOMEM; | |
52 | return 0; | |
53 | } | |
54 | arch_initcall(fsl_lbc_init); | |
55 | ||
56 | /** | |
57 | * fsl_lbc_find - find Localbus bank | |
58 | * @addr_base: base address of the memory bank | |
59 | * | |
60 | * This function walks LBC banks comparing "Base address" field of the BR | |
61 | * registers with the supplied addr_base argument. When bases match this | |
62 | * function returns bank number (starting with 0), otherwise it returns | |
63 | * appropriate errno value. | |
64 | */ | |
65 | int fsl_lbc_find(phys_addr_t addr_base) | |
66 | { | |
67 | int i; | |
68 | ||
69 | if (!fsl_lbc_regs) | |
70 | return -ENODEV; | |
71 | ||
72 | for (i = 0; i < ARRAY_SIZE(fsl_lbc_regs->bank); i++) { | |
73 | __be32 br = in_be32(&fsl_lbc_regs->bank[i].br); | |
74 | __be32 or = in_be32(&fsl_lbc_regs->bank[i].or); | |
75 | ||
76 | if (br & BR_V && (br & or & BR_BA) == addr_base) | |
77 | return i; | |
78 | } | |
79 | ||
80 | return -ENOENT; | |
81 | } | |
82 | EXPORT_SYMBOL(fsl_lbc_find); | |
83 | ||
84 | /** | |
85 | * fsl_upm_find - find pre-programmed UPM via base address | |
86 | * @addr_base: base address of the memory bank controlled by the UPM | |
87 | * @upm: pointer to the allocated fsl_upm structure | |
88 | * | |
89 | * This function fills fsl_upm structure so you can use it with the rest of | |
90 | * UPM API. On success this function returns 0, otherwise it returns | |
91 | * appropriate errno value. | |
92 | */ | |
93 | int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm) | |
94 | { | |
95 | int bank; | |
96 | __be32 br; | |
97 | ||
98 | bank = fsl_lbc_find(addr_base); | |
99 | if (bank < 0) | |
100 | return bank; | |
101 | ||
102 | br = in_be32(&fsl_lbc_regs->bank[bank].br); | |
103 | ||
104 | switch (br & BR_MSEL) { | |
105 | case BR_MS_UPMA: | |
106 | upm->mxmr = &fsl_lbc_regs->mamr; | |
107 | break; | |
108 | case BR_MS_UPMB: | |
109 | upm->mxmr = &fsl_lbc_regs->mbmr; | |
110 | break; | |
111 | case BR_MS_UPMC: | |
112 | upm->mxmr = &fsl_lbc_regs->mcmr; | |
113 | break; | |
114 | default: | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | switch (br & BR_PS) { | |
119 | case BR_PS_8: | |
120 | upm->width = 8; | |
121 | break; | |
122 | case BR_PS_16: | |
123 | upm->width = 16; | |
124 | break; | |
125 | case BR_PS_32: | |
126 | upm->width = 32; | |
127 | break; | |
128 | default: | |
129 | return -EINVAL; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | EXPORT_SYMBOL(fsl_upm_find); | |
c0da99d5 AV |
135 | |
136 | /** | |
137 | * fsl_upm_run_pattern - actually run an UPM pattern | |
138 | * @upm: pointer to the fsl_upm structure obtained via fsl_upm_find | |
139 | * @io_base: remapped pointer to where memory access should happen | |
140 | * @mar: MAR register content during pattern execution | |
141 | * | |
142 | * This function triggers dummy write to the memory specified by the io_base, | |
143 | * thus UPM pattern actually executed. Note that mar usage depends on the | |
144 | * pre-programmed AMX bits in the UPM RAM. | |
145 | */ | |
146 | int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar) | |
147 | { | |
148 | int ret = 0; | |
149 | unsigned long flags; | |
150 | ||
151 | spin_lock_irqsave(&fsl_lbc_lock, flags); | |
152 | ||
b6e0e8c0 | 153 | out_be32(&fsl_lbc_regs->mar, mar); |
c0da99d5 AV |
154 | |
155 | switch (upm->width) { | |
156 | case 8: | |
157 | out_8(io_base, 0x0); | |
158 | break; | |
159 | case 16: | |
160 | out_be16(io_base, 0x0); | |
161 | break; | |
162 | case 32: | |
163 | out_be32(io_base, 0x0); | |
164 | break; | |
165 | default: | |
166 | ret = -EINVAL; | |
167 | break; | |
168 | } | |
169 | ||
170 | spin_unlock_irqrestore(&fsl_lbc_lock, flags); | |
171 | ||
172 | return ret; | |
173 | } | |
174 | EXPORT_SYMBOL(fsl_upm_run_pattern); |