blob: b77e018d36c1116cf52d1e8465319242f0dc5a47 [file] [log] [blame]
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,
Eric Miao1fe8c2b2010-04-27 11:14:24 +0800113 MFPR_LPM_INPUT,
Eric Miaof8dec042009-01-15 16:42:56 +0800114};
115
116/* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */
117static const unsigned long mfpr_pull[] = {
118 MFPR_PULL_NONE,
119 MFPR_PULL_LOW,
120 MFPR_PULL_HIGH,
121 MFPR_PULL_BOTH,
Daniel Mackfb608702009-08-11 14:39:09 +0200122 MFPR_PULL_FLOAT,
Eric Miaof8dec042009-01-15 16:42:56 +0800123};
124
125/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */
126static const unsigned long mfpr_edge[] = {
127 MFPR_EDGE_NONE,
128 MFPR_EDGE_RISE,
129 MFPR_EDGE_FALL,
130 MFPR_EDGE_BOTH,
131};
132
133#define mfpr_readl(off) \
134 __raw_readl(mfpr_mmio_base + (off))
135
136#define mfpr_writel(off, val) \
137 __raw_writel(val, mfpr_mmio_base + (off))
138
139#define mfp_configured(p) ((p)->config != -1)
140
141/*
142 * perform a read-back of any MFPR register to make sure the
143 * previous writings are finished
144 */
145#define mfpr_sync() (void)__raw_readl(mfpr_mmio_base + 0)
146
147static 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
153static 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
164void 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
207unsigned long mfp_read(int mfp)
208{
209 unsigned long val, flags;
210
Roel Kluin7df56c22009-11-13 11:37:34 +0100211 BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX);
Eric Miaof8dec042009-01-15 16:42:56 +0800212
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
220void mfp_write(int mfp, unsigned long val)
221{
222 unsigned long flags;
223
Roel Kluin7df56c22009-11-13 11:37:34 +0100224 BUG_ON(mfp < 0 || mfp >= MFP_PIN_MAX);
Eric Miaof8dec042009-01-15 16:42:56 +0800225
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
232void __init mfp_init_base(unsigned long mfpr_base)
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
240 mfpr_mmio_base = (void __iomem *)mfpr_base;
241}
242
243void __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
251 for (p = map; p->start != MFP_PIN_INVALID; p++) {
252 offset = p->offset;
253 i = p->start;
254
255 do {
256 mfp_table[i].mfpr_off = offset;
257 mfp_table[i].mfpr_run = 0;
258 mfp_table[i].mfpr_lpm = 0;
259 offset += 4; i++;
260 } while ((i <= p->end) && (p->end != -1));
261 }
262
263 spin_unlock_irqrestore(&mfp_spin_lock, flags);
264}
265
266void mfp_config_lpm(void)
267{
268 struct mfp_pin *p = &mfp_table[0];
269 int pin;
270
271 for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++)
272 __mfp_config_lpm(p);
273}
274
275void mfp_config_run(void)
276{
277 struct mfp_pin *p = &mfp_table[0];
278 int pin;
279
280 for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++, p++)
281 __mfp_config_run(p);
282}