xen/balloon: Move dec_totalhigh_pages() from __balloon_append() to balloon_append()
[pandora-kernel.git] / drivers / pcmcia / pxa2xx_balloon3.c
1 /*
2  * linux/drivers/pcmcia/pxa2xx_balloon3.c
3  *
4  * Balloon3 PCMCIA specific routines.
5  *
6  *  Author:     Nick Bane
7  *  Created:    June, 2006
8  *  Copyright:  Toby Churchill Ltd
9  *  Derived from pxa2xx_mainstone.c, by Nico Pitre
10  *
11  * Various modification by Marek Vasut <marek.vasut@gmail.com>
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License version 2 as
15  * published by the Free Software Foundation.
16  */
17
18 #include <linux/module.h>
19 #include <linux/gpio.h>
20 #include <linux/errno.h>
21 #include <linux/interrupt.h>
22 #include <linux/platform_device.h>
23 #include <linux/irq.h>
24 #include <linux/io.h>
25
26 #include <mach/balloon3.h>
27
28 #include "soc_common.h"
29
30 /*
31  * These are a list of interrupt sources that provokes a polled
32  * check of status
33  */
34 static struct pcmcia_irqs irqs[] = {
35         { 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
36         { 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
37 };
38
39 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
40 {
41         uint16_t ver;
42
43         ver = __raw_readw(BALLOON3_FPGA_VER);
44         if (ver < 0x4f08)
45                 pr_warn("The FPGA code, version 0x%04x, is too old. "
46                         "PCMCIA/CF support might be broken in this version!",
47                         ver);
48
49         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
50         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
51 }
52
53 static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
54 {
55         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
56 }
57
58 static unsigned long balloon3_pcmcia_status[2] = {
59         BALLOON3_CF_nSTSCHG_BVD1,
60         BALLOON3_CF_nSTSCHG_BVD1
61 };
62
63 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
64                                     struct pcmcia_state *state)
65 {
66         uint16_t status;
67         int flip;
68
69         /* This actually reads the STATUS register */
70         status = __raw_readw(BALLOON3_CF_STATUS_REG);
71         flip = (status ^ balloon3_pcmcia_status[skt->nr])
72                 & BALLOON3_CF_nSTSCHG_BVD1;
73         /*
74          * Workaround for STSCHG which can't be deasserted:
75          * We therefore disable/enable corresponding IRQs
76          * as needed to avoid IRQ locks.
77          */
78         if (flip) {
79                 balloon3_pcmcia_status[skt->nr] = status;
80                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
81                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
82                 else
83                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
84         }
85
86         state->detect   = !gpio_get_value(BALLOON3_GPIO_S0_CD);
87         state->ready    = !!(status & BALLOON3_CF_nIRQ);
88         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
89         state->bvd2     = 0;    /* not available */
90         state->vs_3v    = 1;    /* Always true its a CF card */
91         state->vs_Xv    = 0;    /* not available */
92         state->wrprot   = 0;    /* not available */
93 }
94
95 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
96                                        const socket_state_t *state)
97 {
98         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG |
99                         ((state->flags & SS_RESET) ?
100                         BALLOON3_FPGA_SETnCLR : 0));
101         return 0;
102 }
103
104 static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
105 {
106 }
107
108 static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
109 {
110 }
111
112 static struct pcmcia_low_level balloon3_pcmcia_ops = {
113         .owner                  = THIS_MODULE,
114         .hw_init                = balloon3_pcmcia_hw_init,
115         .hw_shutdown            = balloon3_pcmcia_hw_shutdown,
116         .socket_state           = balloon3_pcmcia_socket_state,
117         .configure_socket       = balloon3_pcmcia_configure_socket,
118         .socket_init            = balloon3_pcmcia_socket_init,
119         .socket_suspend         = balloon3_pcmcia_socket_suspend,
120         .first                  = 0,
121         .nr                     = 1,
122 };
123
124 static struct platform_device *balloon3_pcmcia_device;
125
126 static int __init balloon3_pcmcia_init(void)
127 {
128         int ret;
129
130         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
131         if (!balloon3_pcmcia_device)
132                 return -ENOMEM;
133
134         ret = platform_device_add_data(balloon3_pcmcia_device,
135                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
136
137         if (!ret)
138                 ret = platform_device_add(balloon3_pcmcia_device);
139
140         if (ret)
141                 platform_device_put(balloon3_pcmcia_device);
142
143         return ret;
144 }
145
146 static void __exit balloon3_pcmcia_exit(void)
147 {
148         platform_device_unregister(balloon3_pcmcia_device);
149 }
150
151 module_init(balloon3_pcmcia_init);
152 module_exit(balloon3_pcmcia_exit);
153
154 MODULE_LICENSE("GPL");
155 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
156 MODULE_ALIAS("platform:pxa2xx-pcmcia");
157 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");