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Eric Miaof8dec042009-01-15 16:42:56 +08001/*
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>
20#include <linux/sysdev.h>
21
22#include <plat/mfp.h>
23
24#define MFPR_SIZE (PAGE_SIZE)
25
26/* MFPR register bit definitions */
27#define MFPR_PULL_SEL (0x1 << 15)
28#define MFPR_PULLUP_EN (0x1 << 14)
29#define MFPR_PULLDOWN_EN (0x1 << 13)
30#define MFPR_SLEEP_SEL (0x1 << 9)
31#define MFPR_SLEEP_OE_N (0x1 << 7)
32#define MFPR_EDGE_CLEAR (0x1 << 6)
33#define MFPR_EDGE_FALL_EN (0x1 << 5)
34#define MFPR_EDGE_RISE_EN (0x1 << 4)
35
36#define MFPR_SLEEP_DATA(x) ((x) << 8)
37#define MFPR_DRIVE(x) (((x) & 0x7) << 10)
38#define MFPR_AF_SEL(x) (((x) & 0x7) << 0)
39
40#define MFPR_EDGE_NONE (0)
41#define MFPR_EDGE_RISE (MFPR_EDGE_RISE_EN)
42#define MFPR_EDGE_FALL (MFPR_EDGE_FALL_EN)
43#define MFPR_EDGE_BOTH (MFPR_EDGE_RISE | MFPR_EDGE_FALL)
44
45/*
46 * Table that determines the low power modes outputs, with actual settings
47 * used in parentheses for don't-care values. Except for the float output,
48 * the configured driven and pulled levels match, so if there is a need for
49 * non-LPM pulled output, the same configuration could probably be used.
50 *
51 * Output value sleep_oe_n sleep_data pullup_en pulldown_en pull_sel
52 * (bit 7) (bit 8) (bit 14) (bit 13) (bit 15)
53 *
54 * Input 0 X(0) X(0) X(0) 0
55 * Drive 0 0 0 0 X(1) 0
56 * Drive 1 0 1 X(1) 0 0
57 * Pull hi (1) 1 X(1) 1 0 0
58 * Pull lo (0) 1 X(0) 0 1 0
59 * Z (float) 1 X(0) 0 0 0
60 */
61#define MFPR_LPM_INPUT (0)
62#define MFPR_LPM_DRIVE_LOW (MFPR_SLEEP_DATA(0) | MFPR_PULLDOWN_EN)
63#define MFPR_LPM_DRIVE_HIGH (MFPR_SLEEP_DATA(1) | MFPR_PULLUP_EN)
64#define MFPR_LPM_PULL_LOW (MFPR_LPM_DRIVE_LOW | MFPR_SLEEP_OE_N)
65#define MFPR_LPM_PULL_HIGH (MFPR_LPM_DRIVE_HIGH | MFPR_SLEEP_OE_N)
66#define MFPR_LPM_FLOAT (MFPR_SLEEP_OE_N)
67#define MFPR_LPM_MASK (0xe080)
68
69/*
70 * The pullup and pulldown state of the MFP pin at run mode is by default
71 * determined by the selected alternate function. In case that some buggy
72 * devices need to override this default behavior, the definitions below
73 * indicates the setting of corresponding MFPR bits
74 *
75 * Definition pull_sel pullup_en pulldown_en
76 * MFPR_PULL_NONE 0 0 0
77 * MFPR_PULL_LOW 1 0 1
78 * MFPR_PULL_HIGH 1 1 0
79 * MFPR_PULL_BOTH 1 1 1
Daniel Mackfb608702009-08-11 14:39:09 +020080 * MFPR_PULL_FLOAT 1 0 0
Eric Miaof8dec042009-01-15 16:42:56 +080081 */
82#define MFPR_PULL_NONE (0)
83#define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN)
84#define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN)
85#define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN)
Daniel Mackfb608702009-08-11 14:39:09 +020086#define MFPR_PULL_FLOAT (MFPR_PULL_SEL)
Eric Miaof8dec042009-01-15 16:42:56 +080087
88/* mfp_spin_lock is used to ensure that MFP register configuration
89 * (most likely a read-modify-write operation) is atomic, and that
90 * mfp_table[] is consistent
91 */
92static DEFINE_SPINLOCK(mfp_spin_lock);
93
94static void __iomem *mfpr_mmio_base;
95
96struct mfp_pin {
97 unsigned long config; /* -1 for not configured */
98 unsigned long mfpr_off; /* MFPRxx Register offset */
99 unsigned long mfpr_run; /* Run-Mode Register Value */
100 unsigned long mfpr_lpm; /* Low Power Mode Register Value */
101};
102
103static struct mfp_pin mfp_table[MFP_PIN_MAX];
104
105/* mapping of MFP_LPM_* definitions to MFPR_LPM_* register bits */
106static const unsigned long mfpr_lpm[] = {
107 MFPR_LPM_INPUT,
108 MFPR_LPM_DRIVE_LOW,
109 MFPR_LPM_DRIVE_HIGH,
110 MFPR_LPM_PULL_LOW,
111 MFPR_LPM_PULL_HIGH,
112 MFPR_LPM_FLOAT,
113};
114
115/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */
116static const unsigned long mfpr_pull[] = {
117 MFPR_PULL_NONE,
118 MFPR_PULL_LOW,
119 MFPR_PULL_HIGH,
120 MFPR_PULL_BOTH,
Daniel Mackfb608702009-08-11 14:39:09 +0200121 MFPR_PULL_FLOAT,
Eric Miaof8dec042009-01-15 16:42:56 +0800122};
123
124/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */
125static 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/*
141 * perform a read-back of any MFPR register to make sure the
142 * previous writings are finished
143 */
144#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + 0)
145
146static inline void __mfp_config_run(struct mfp_pin *p)
147{
148 if (mfp_configured(p))
149 mfpr_writel(p->mfpr_off, p->mfpr_run);
150}
151
152static inline void __mfp_config_lpm(struct mfp_pin *p)
153{
154 if (mfp_configured(p)) {
155 unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR;
156 if (mfpr_clr != p->mfpr_run)
157 mfpr_writel(p->mfpr_off, mfpr_clr);
158 if (p->mfpr_lpm != mfpr_clr)
159 mfpr_writel(p->mfpr_off, p->mfpr_lpm);
160 }
161}
162
163void mfp_config(unsigned long *mfp_cfgs, int num)
164{
165 unsigned long flags;
166 int i;
167
168 spin_lock_irqsave(&mfp_spin_lock, flags);
169
170 for (i = 0; i < num; i++, mfp_cfgs++) {
171 unsigned long tmp, c = *mfp_cfgs;
172 struct mfp_pin *p;
173 int pin, af, drv, lpm, edge, pull;
174
175 pin = MFP_PIN(c);
176 BUG_ON(pin >= MFP_PIN_MAX);
177 p = &mfp_table[pin];
178
179 af = MFP_AF(c);
180 drv = MFP_DS(c);
181 lpm = MFP_LPM_STATE(c);
182 edge = MFP_LPM_EDGE(c);
183 pull = MFP_PULL(c);
184
185 /* run-mode pull settings will conflict with MFPR bits of
186 * low power mode state, calculate mfpr_run and mfpr_lpm
187 * individually if pull != MFP_PULL_NONE
188 */
189 tmp = MFPR_AF_SEL(af) | MFPR_DRIVE(drv);
190
191 if (likely(pull == MFP_PULL_NONE)) {
192 p->mfpr_run = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
193 p->mfpr_lpm = p->mfpr_run;
194 } else {
195 p->mfpr_lpm = tmp | mfpr_lpm[lpm] | mfpr_edge[edge];
196 p->mfpr_run = tmp | mfpr_pull[pull];
197 }
198
199 p->config = c; __mfp_config_run(p);
200 }
201
202 mfpr_sync();
203 spin_unlock_irqrestore(&mfp_spin_lock, flags);
204}
205
206unsigned long mfp_read(int mfp)
207{
208 unsigned long val, flags;
209
210 BUG_ON(mfp >= MFP_PIN_MAX);
211
212 spin_lock_irqsave(&mfp_spin_lock, flags);
213 val = mfpr_readl(mfp_table[mfp].mfpr_off);
214 spin_unlock_irqrestore(&mfp_spin_lock, flags);
215
216 return val;
217}
218
219void mfp_write(int mfp, unsigned long val)
220{
221 unsigned long flags;
222
223 BUG_ON(mfp >= MFP_PIN_MAX);
224
225 spin_lock_irqsave(&mfp_spin_lock, flags);
226 mfpr_writel(mfp_table[mfp].mfpr_off, val);
227 mfpr_sync();
228 spin_unlock_irqrestore(&mfp_spin_lock, flags);
229}
230
231void __init mfp_init_base(unsigned long mfpr_base)
232{
233 int i;
234
235 /* initialize the table with default - unconfigured */
236 for (i = 0; i < ARRAY_SIZE(mfp_table); i++)
237 mfp_table[i].config = -1;
238
239 mfpr_mmio_base = (void __iomem *)mfpr_base;
240}
241
242void __init mfp_init_addr(struct mfp_addr_map *map)
243{
244 struct mfp_addr_map *p;
245 unsigned long offset, flags;
246 int i;
247
248 spin_lock_irqsave(&mfp_spin_lock, flags);
249
250 for (p = map; p->start != MFP_PIN_INVALID; p++) {
251 offset = p->offset;
252 i = p->start;
253
254 do {
255 mfp_table[i].mfpr_off = offset;
256 mfp_table[i].mfpr_run = 0;
257 mfp_table[i].mfpr_lpm = 0;
258 offset += 4; i++;
259 } while ((i <= p->end) && (p->end != -1));
260 }
261
262 spin_unlock_irqrestore(&mfp_spin_lock, flags);
263}
264
265void mfp_config_lpm(void)
266{
267 struct mfp_pin *p = &mfp_table[0];
268 int pin;
269
270 for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++)
271 __mfp_config_lpm(p);
272}
273
274void mfp_config_run(void)
275{
276 struct mfp_pin *p = &mfp_table[0];
277 int pin;
278
279 for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++)
280 __mfp_config_run(p);
281}