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Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * Common CPM code
3 *
4 * Author: Scott Wood <scottwood@freescale.com>
5 *
6 * Copyright 2007-2008,2010 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#include <linux/spinlock.h>
23#include <linux/export.h>
24#include <linux/of.h>
25#include <linux/of_address.h>
26#include <linux/slab.h>
27
28#include <asm/udbg.h>
29#include <asm/io.h>
30#include <asm/cpm.h>
31#include <soc/fsl/qe/qe.h>
32
33#include <mm/mmu_decl.h>
34
35#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
36#include <linux/of_gpio.h>
37#endif
38
39#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
40static u32 __iomem *cpm_udbg_txdesc =
41 (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
42
43static void udbg_putc_cpm(char c)
44{
45 u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
46
47 if (c == '\n')
48 udbg_putc_cpm('\r');
49
50 while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
51 ;
52
53 out_8(txbuf, c);
54 out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
55}
56
57void __init udbg_init_cpm(void)
58{
59 if (cpm_udbg_txdesc) {
60#ifdef CONFIG_CPM2
61 setbat(1, 0xf0000000, 0xf0000000, 1024*1024, PAGE_KERNEL_NCG);
62#endif
63 udbg_putc = udbg_putc_cpm;
64 }
65}
66#endif
67
68#if defined(CONFIG_CPM2) || defined(CONFIG_8xx_GPIO)
69
70struct cpm2_ioports {
71 u32 dir, par, sor, odr, dat;
72 u32 res[3];
73};
74
75struct cpm2_gpio32_chip {
76 struct of_mm_gpio_chip mm_gc;
77 spinlock_t lock;
78
79 /* shadowed data register to clear/set bits safely */
80 u32 cpdata;
81};
82
83static void cpm2_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
84{
85 struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(&mm_gc->gc);
86 struct cpm2_ioports __iomem *iop = mm_gc->regs;
87
88 cpm2_gc->cpdata = in_be32(&iop->dat);
89}
90
91static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
92{
93 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
94 struct cpm2_ioports __iomem *iop = mm_gc->regs;
95 u32 pin_mask;
96
97 pin_mask = 1 << (31 - gpio);
98
99 return !!(in_be32(&iop->dat) & pin_mask);
100}
101
102static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
103 int value)
104{
105 struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(&mm_gc->gc);
106 struct cpm2_ioports __iomem *iop = mm_gc->regs;
107
108 if (value)
109 cpm2_gc->cpdata |= pin_mask;
110 else
111 cpm2_gc->cpdata &= ~pin_mask;
112
113 out_be32(&iop->dat, cpm2_gc->cpdata);
114}
115
116static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
117{
118 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
119 struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc);
120 unsigned long flags;
121 u32 pin_mask = 1 << (31 - gpio);
122
123 spin_lock_irqsave(&cpm2_gc->lock, flags);
124
125 __cpm2_gpio32_set(mm_gc, pin_mask, value);
126
127 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
128}
129
130static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
131{
132 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
133 struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc);
134 struct cpm2_ioports __iomem *iop = mm_gc->regs;
135 unsigned long flags;
136 u32 pin_mask = 1 << (31 - gpio);
137
138 spin_lock_irqsave(&cpm2_gc->lock, flags);
139
140 setbits32(&iop->dir, pin_mask);
141 __cpm2_gpio32_set(mm_gc, pin_mask, val);
142
143 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
144
145 return 0;
146}
147
148static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
149{
150 struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
151 struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc);
152 struct cpm2_ioports __iomem *iop = mm_gc->regs;
153 unsigned long flags;
154 u32 pin_mask = 1 << (31 - gpio);
155
156 spin_lock_irqsave(&cpm2_gc->lock, flags);
157
158 clrbits32(&iop->dir, pin_mask);
159
160 spin_unlock_irqrestore(&cpm2_gc->lock, flags);
161
162 return 0;
163}
164
165int cpm2_gpiochip_add32(struct device_node *np)
166{
167 struct cpm2_gpio32_chip *cpm2_gc;
168 struct of_mm_gpio_chip *mm_gc;
169 struct gpio_chip *gc;
170
171 cpm2_gc = kzalloc(sizeof(*cpm2_gc), GFP_KERNEL);
172 if (!cpm2_gc)
173 return -ENOMEM;
174
175 spin_lock_init(&cpm2_gc->lock);
176
177 mm_gc = &cpm2_gc->mm_gc;
178 gc = &mm_gc->gc;
179
180 mm_gc->save_regs = cpm2_gpio32_save_regs;
181 gc->ngpio = 32;
182 gc->direction_input = cpm2_gpio32_dir_in;
183 gc->direction_output = cpm2_gpio32_dir_out;
184 gc->get = cpm2_gpio32_get;
185 gc->set = cpm2_gpio32_set;
186
187 return of_mm_gpiochip_add_data(np, mm_gc, cpm2_gc);
188}
189#endif /* CONFIG_CPM2 || CONFIG_8xx_GPIO */