Root/drivers/pcmcia/soc_common.h

1/*
2 * linux/drivers/pcmcia/soc_common.h
3 *
4 * Copyright (C) 2000 John G Dorsey <john+@cs.cmu.edu>
5 *
6 * This file contains definitions for the PCMCIA support code common to
7 * integrated SOCs like the SA-11x0 and PXA2xx microprocessors.
8 */
9#ifndef _ASM_ARCH_PCMCIA
10#define _ASM_ARCH_PCMCIA
11
12/* include the world */
13#include <linux/clk.h>
14#include <linux/cpufreq.h>
15#include <pcmcia/ss.h>
16#include <pcmcia/cistpl.h>
17
18
19struct device;
20struct pcmcia_low_level;
21
22/*
23 * This structure encapsulates per-socket state which we might need to
24 * use when responding to a Card Services query of some kind.
25 */
26struct soc_pcmcia_socket {
27    struct pcmcia_socket socket;
28
29    /*
30     * Info from low level handler
31     */
32    unsigned int nr;
33    struct clk *clk;
34
35    /*
36     * Core PCMCIA state
37     */
38    const struct pcmcia_low_level *ops;
39
40    unsigned int status;
41    socket_state_t cs_state;
42
43    unsigned short spd_io[MAX_IO_WIN];
44    unsigned short spd_mem[MAX_WIN];
45    unsigned short spd_attr[MAX_WIN];
46
47    struct resource res_skt;
48    struct resource res_io;
49    struct resource res_mem;
50    struct resource res_attr;
51    void __iomem *virt_io;
52
53    struct {
54        int gpio;
55        unsigned int irq;
56        const char *name;
57    } stat[4];
58#define SOC_STAT_CD 0 /* Card detect */
59#define SOC_STAT_BVD1 1 /* BATDEAD / IOSTSCHG */
60#define SOC_STAT_BVD2 2 /* BATWARN / IOSPKR */
61#define SOC_STAT_RDY 3 /* Ready / Interrupt */
62
63    unsigned int irq_state;
64
65    struct timer_list poll_timer;
66    struct list_head node;
67};
68
69struct skt_dev_info {
70    int nskt;
71    struct clk *clk;
72    struct soc_pcmcia_socket skt[0];
73};
74
75struct pcmcia_state {
76  unsigned detect: 1,
77            ready: 1,
78             bvd1: 1,
79             bvd2: 1,
80           wrprot: 1,
81            vs_3v: 1,
82            vs_Xv: 1;
83};
84
85struct pcmcia_low_level {
86    struct module *owner;
87
88    /* first socket in system */
89    int first;
90    /* nr of sockets */
91    int nr;
92
93    int (*hw_init)(struct soc_pcmcia_socket *);
94    void (*hw_shutdown)(struct soc_pcmcia_socket *);
95
96    void (*socket_state)(struct soc_pcmcia_socket *, struct pcmcia_state *);
97    int (*configure_socket)(struct soc_pcmcia_socket *, const socket_state_t *);
98
99    /*
100     * Enable card status IRQs on (re-)initialisation. This can
101     * be called at initialisation, power management event, or
102     * pcmcia event.
103     */
104    void (*socket_init)(struct soc_pcmcia_socket *);
105
106    /*
107     * Disable card status IRQs and PCMCIA bus on suspend.
108     */
109    void (*socket_suspend)(struct soc_pcmcia_socket *);
110
111    /*
112     * Hardware specific timing routines.
113     * If provided, the get_timing routine overrides the SOC default.
114     */
115    unsigned int (*get_timing)(struct soc_pcmcia_socket *, unsigned int, unsigned int);
116    int (*set_timing)(struct soc_pcmcia_socket *);
117    int (*show_timing)(struct soc_pcmcia_socket *, char *);
118
119#ifdef CONFIG_CPU_FREQ
120    /*
121     * CPUFREQ support.
122     */
123    int (*frequency_change)(struct soc_pcmcia_socket *, unsigned long, struct cpufreq_freqs *);
124#endif
125};
126
127
128struct soc_pcmcia_timing {
129    unsigned short io;
130    unsigned short mem;
131    unsigned short attr;
132};
133
134extern void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *, struct soc_pcmcia_timing *);
135
136void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
137    struct pcmcia_low_level *ops, struct device *dev);
138void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt);
139int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt);
140
141
142#ifdef CONFIG_PCMCIA_DEBUG
143
144extern void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,
145                 int lvl, const char *fmt, ...);
146
147#define debug(skt, lvl, fmt, arg...) \
148    soc_pcmcia_debug(skt, __func__, lvl, fmt , ## arg)
149
150#else
151#define debug(skt, lvl, fmt, arg...) do { } while (0)
152#endif
153
154
155/*
156 * The PC Card Standard, Release 7, section 4.13.4, says that twIORD
157 * has a minimum value of 165ns. Section 4.13.5 says that twIOWR has
158 * a minimum value of 165ns, as well. Section 4.7.2 (describing
159 * common and attribute memory write timing) says that twWE has a
160 * minimum value of 150ns for a 250ns cycle time (for 5V operation;
161 * see section 4.7.4), or 300ns for a 600ns cycle time (for 3.3V
162 * operation, also section 4.7.4). Section 4.7.3 says that taOE
163 * has a maximum value of 150ns for a 300ns cycle time (for 5V
164 * operation), or 300ns for a 600ns cycle time (for 3.3V operation).
165 *
166 * When configuring memory maps, Card Services appears to adopt the policy
167 * that a memory access time of "0" means "use the default." The default
168 * PCMCIA I/O command width time is 165ns. The default PCMCIA 5V attribute
169 * and memory command width time is 150ns; the PCMCIA 3.3V attribute and
170 * memory command width time is 300ns.
171 */
172#define SOC_PCMCIA_IO_ACCESS (165)
173#define SOC_PCMCIA_5V_MEM_ACCESS (150)
174#define SOC_PCMCIA_3V_MEM_ACCESS (300)
175#define SOC_PCMCIA_ATTR_MEM_ACCESS (300)
176
177/*
178 * The socket driver actually works nicely in interrupt-driven form,
179 * so the (relatively infrequent) polling is "just to be sure."
180 */
181#define SOC_PCMCIA_POLL_PERIOD (2*HZ)
182
183
184/* I/O pins replacing memory pins
185 * (PCMCIA System Architecture, 2nd ed., by Don Anderson, p.75)
186 *
187 * These signals change meaning when going from memory-only to
188 * memory-or-I/O interface:
189 */
190#define iostschg bvd1
191#define iospkr bvd2
192
193#endif
194

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