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1 | /* |
2 | * linux/arch/arm/plat-pxa/mfp.c | |
3 | * | |
4 | * Multi-Function Pin Support | |
5 | * | |
6 | * Copyright (C) 2007 Marvell Internation Ltd. | |
7 | * | |
8 | * 2007-08-21: eric miao <eric.miao@marvell.com> | |
9 | * initial version | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/io.h> | |
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20 | |
21 | #include <plat/mfp.h> | |
22 | ||
23 | #define MFPR_SIZE (PAGE_SIZE) | |
24 | ||
25 | /* MFPR register bit definitions */ | |
26 | #define MFPR_PULL_SEL (0x1 << 15) | |
27 | #define MFPR_PULLUP_EN (0x1 << 14) | |
28 | #define MFPR_PULLDOWN_EN (0x1 << 13) | |
29 | #define MFPR_SLEEP_SEL (0x1 << 9) | |
30 | #define MFPR_SLEEP_OE_N (0x1 << 7) | |
31 | #define MFPR_EDGE_CLEAR (0x1 << 6) | |
32 | #define MFPR_EDGE_FALL_EN (0x1 << 5) | |
33 | #define MFPR_EDGE_RISE_EN (0x1 << 4) | |
34 | ||
35 | #define MFPR_SLEEP_DATA(x) ((x) << 8) | |
36 | #define MFPR_DRIVE(x) (((x) & 0x7) << 10) | |
37 | #define MFPR_AF_SEL(x) (((x) & 0x7) << 0) | |
38 | ||
39 | #define MFPR_EDGE_NONE (0) | |
40 | #define MFPR_EDGE_RISE (MFPR_EDGE_RISE_EN) | |
41 | #define MFPR_EDGE_FALL (MFPR_EDGE_FALL_EN) | |
42 | #define MFPR_EDGE_BOTH (MFPR_EDGE_RISE | MFPR_EDGE_FALL) | |
43 | ||
44 | /* | |
45 | * Table that determines the low power modes outputs, with actual settings | |
46 | * used in parentheses for don't-care values. Except for the float output, | |
47 | * the configured driven and pulled levels match, so if there is a need for | |
48 | * non-LPM pulled output, the same configuration could probably be used. | |
49 | * | |
50 | * Output value sleep_oe_n sleep_data pullup_en pulldown_en pull_sel | |
51 | * (bit 7) (bit 8) (bit 14) (bit 13) (bit 15) | |
52 | * | |
53 | * Input 0 X(0) X(0) X(0) 0 | |
54 | * Drive 0 0 0 0 X(1) 0 | |
55 | * Drive 1 0 1 X(1) 0 0 | |
56 | * Pull hi (1) 1 X(1) 1 0 0 | |
57 | * Pull lo (0) 1 X(0) 0 1 0 | |
58 | * Z (float) 1 X(0) 0 0 0 | |
59 | */ | |
60 | #define MFPR_LPM_INPUT (0) | |
61 | #define MFPR_LPM_DRIVE_LOW (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN) | |
62 | #define MFPR_LPM_DRIVE_HIGH (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN) | |
63 | #define MFPR_LPM_PULL_LOW (MFPR_LPM_DRIVE_LOW | MFPR_SLEEP_OE_N) | |
64 | #define MFPR_LPM_PULL_HIGH (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N) | |
65 | #define MFPR_LPM_FLOAT (MFPR_SLEEP_OE_N) | |
66 | #define MFPR_LPM_MASK (0xe080) | |
67 | ||
68 | /* | |
69 | * The pullup and pulldown state of the MFP pin at run mode is by default | |
70 | * determined by the selected alternate function. In case that some buggy | |
71 | * devices need to override this default behavior, the definitions below | |
72 | * indicates the setting of corresponding MFPR bits | |
73 | * | |
74 | * Definition pull_sel pullup_en pulldown_en | |
75 | * MFPR_PULL_NONE 0 0 0 | |
76 | * MFPR_PULL_LOW 1 0 1 | |
77 | * MFPR_PULL_HIGH 1 1 0 | |
78 | * MFPR_PULL_BOTH 1 1 1 | |
fb60870f | 79 | * MFPR_PULL_FLOAT 1 0 0 |
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80 | */ |
81 | #define MFPR_PULL_NONE (0) | |
82 | #define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN) | |
83 | #define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN) | |
84 | #define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN) | |
fb60870f | 85 | #define MFPR_PULL_FLOAT (MFPR_PULL_SEL) |
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86 | |
87 | /* mfp_spin_lock is used to ensure that MFP register configuration | |
88 | * (most likely a read-modify-write operation) is atomic, and that | |
89 | * mfp_table[] is consistent | |
90 | */ | |
91 | static DEFINE_SPINLOCK(mfp_spin_lock); | |
92 | ||
93 | static void __iomem *mfpr_mmio_base; | |
94 | ||
95 | struct mfp_pin { | |
96 | unsigned long config; /* -1 for not configured */ | |
97 | unsigned long mfpr_off; /* MFPRxx Register offset */ | |
98 | unsigned long mfpr_run; /* Run-Mode Register Value */ | |
99 | unsigned long mfpr_lpm; /* Low Power Mode Register Value */ | |
100 | }; | |
101 | ||
102 | static struct mfp_pin mfp_table[MFP_PIN_MAX]; | |
103 | ||
104 | /* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */ | |
105 | static const unsigned long mfpr_lpm[] = { | |
106 | MFPR_LPM_INPUT, | |
107 | MFPR_LPM_DRIVE_LOW, | |
108 | MFPR_LPM_DRIVE_HIGH, | |
109 | MFPR_LPM_PULL_LOW, | |
110 | MFPR_LPM_PULL_HIGH, | |
111 | MFPR_LPM_FLOAT, | |
1fe8c2bc | 112 | MFPR_LPM_INPUT, |
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113 | }; |
114 | ||
115 | /* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */ | |
116 | static const unsigned long mfpr_pull[] = { | |
117 | MFPR_PULL_NONE, | |
118 | MFPR_PULL_LOW, | |
119 | MFPR_PULL_HIGH, | |
120 | MFPR_PULL_BOTH, | |
fb60870f | 121 | MFPR_PULL_FLOAT, |
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122 | }; |
123 | ||
124 | /* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */ | |
125 | static const unsigned long mfpr_edge[] = { | |
126 | MFPR_EDGE_NONE, | |
127 | MFPR_EDGE_RISE, | |
128 | MFPR_EDGE_FALL, | |
129 | MFPR_EDGE_BOTH, | |
130 | }; | |
131 | ||
132 | #define mfpr_readl(off) \ | |
133 | __raw_readl(mfpr_mmio_base + (off)) | |
134 | ||
135 | #define mfpr_writel(off, val) \ | |
136 | __raw_writel(val, mfpr_mmio_base + (off)) | |
137 | ||
138 | #define mfp_configured(p) ((p)->config != -1) | |
139 | ||
140 | /* | |
0c7fbbe1 | 141 | * perform a read-back of any valid MFPR register to make sure the |
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142 | * previous writings are finished |
143 | */ | |
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144 | static unsigned long mfpr_off_readback; |
145 | #define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + mfpr_off_readback) | |
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146 | |
147 | static inline void __mfp_config_run(struct mfp_pin *p) | |
148 | { | |
149 | if (mfp_configured(p)) | |
150 | mfpr_writel(p->mfpr_off, p->mfpr_run); | |
151 | } | |
152 | ||
153 | static inline void __mfp_config_lpm(struct mfp_pin *p) | |
154 | { | |
155 | if (mfp_configured(p)) { | |
156 | unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR; | |
157 | if (mfpr_clr != p->mfpr_run) | |
158 | mfpr_writel(p->mfpr_off, mfpr_clr); | |
159 | if (p->mfpr_lpm != mfpr_clr) | |
160 | mfpr_writel(p->mfpr_off, p->mfpr_lpm); | |
161 | } | |
162 | } | |
163 | ||
164 | void mfp_config(unsigned long *mfp_cfgs, int num) | |
165 | { | |
166 | unsigned long flags; | |
167 | int i; | |
168 | ||
169 | spin_lock_irqsave(&mfp_spin_lock, flags); | |
170 | ||
171 | for (i = 0; i < num; i++, mfp_cfgs++) { | |
172 | unsigned long tmp, c = *mfp_cfgs; | |
173 | struct mfp_pin *p; | |
174 | int pin, af, drv, lpm, edge, pull; | |
175 | ||
176 | pin = MFP_PIN(c); | |
177 | BUG_ON(pin >= MFP_PIN_MAX); | |
178 | p = &mfp_table[pin]; | |
179 | ||
180 | af = MFP_AF(c); | |
181 | drv = MFP_DS(c); | |
182 | lpm = MFP_LPM_STATE(c); | |
183 | edge = MFP_LPM_EDGE(c); | |
184 | pull = MFP_PULL(c); | |
185 | ||
186 | /* run-mode pull settings will conflict with MFPR bits of | |
187 | * low power mode state, calculate mfpr_run and mfpr_lpm | |
188 | * individually if pull != MFP_PULL_NONE | |
189 | */ | |
190 | tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv); | |
191 | ||
192 | if (likely(pull == MFP_PULL_NONE)) { | |
193 | p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; | |
194 | p->mfpr_lpm = p->mfpr_run; | |
195 | } else { | |
196 | p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge]; | |
197 | p->mfpr_run = tmp | mfpr_pull[pull]; | |
198 | } | |
199 | ||
200 | p->config = c; __mfp_config_run(p); | |
201 | } | |
202 | ||
203 | mfpr_sync(); | |
204 | spin_unlock_irqrestore(&mfp_spin_lock, flags); | |
205 | } | |
206 | ||
207 | unsigned long mfp_read(int mfp) | |
208 | { | |
209 | unsigned long val, flags; | |
210 | ||
7df56c25 | 211 | BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); |
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212 | |
213 | spin_lock_irqsave(&mfp_spin_lock, flags); | |
214 | val = mfpr_readl(mfp_table[mfp].mfpr_off); | |
215 | spin_unlock_irqrestore(&mfp_spin_lock, flags); | |
216 | ||
217 | return val; | |
218 | } | |
219 | ||
220 | void mfp_write(int mfp, unsigned long val) | |
221 | { | |
222 | unsigned long flags; | |
223 | ||
7df56c25 | 224 | BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX); |
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225 | |
226 | spin_lock_irqsave(&mfp_spin_lock, flags); | |
227 | mfpr_writel(mfp_table[mfp].mfpr_off, val); | |
228 | mfpr_sync(); | |
229 | spin_unlock_irqrestore(&mfp_spin_lock, flags); | |
230 | } | |
231 | ||
97b09da4 | 232 | void __init mfp_init_base(void __iomem *mfpr_base) |
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233 | { |
234 | int i; | |
235 | ||
236 | /* initialize the table with default - unconfigured */ | |
237 | for (i = 0; i < ARRAY_SIZE(mfp_table); i++) | |
238 | mfp_table[i].config = -1; | |
239 | ||
97b09da4 | 240 | mfpr_mmio_base = mfpr_base; |
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241 | } |
242 | ||
243 | void __init mfp_init_addr(struct mfp_addr_map *map) | |
244 | { | |
245 | struct mfp_addr_map *p; | |
246 | unsigned long offset, flags; | |
247 | int i; | |
248 | ||
249 | spin_lock_irqsave(&mfp_spin_lock, flags); | |
250 | ||
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251 | /* mfp offset for readback */ |
252 | mfpr_off_readback = map[0].offset; | |
253 | ||
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254 | for (p = map; p->start != MFP_PIN_INVALID; p++) { |
255 | offset = p->offset; | |
256 | i = p->start; | |
257 | ||
258 | do { | |
259 | mfp_table[i].mfpr_off = offset; | |
260 | mfp_table[i].mfpr_run = 0; | |
261 | mfp_table[i].mfpr_lpm = 0; | |
262 | offset += 4; i++; | |
263 | } while ((i <= p->end) && (p->end != -1)); | |
264 | } | |
265 | ||
266 | spin_unlock_irqrestore(&mfp_spin_lock, flags); | |
267 | } | |
268 | ||
269 | void mfp_config_lpm(void) | |
270 | { | |
271 | struct mfp_pin *p = &mfp_table[0]; | |
272 | int pin; | |
273 | ||
274 | for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) | |
275 | __mfp_config_lpm(p); | |
276 | } | |
277 | ||
278 | void mfp_config_run(void) | |
279 | { | |
280 | struct mfp_pin *p = &mfp_table[0]; | |
281 | int pin; | |
282 | ||
283 | for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++) | |
284 | __mfp_config_run(p); | |
285 | } |