Merge branch 'slab/urgent' into slab/next
[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 <asm/mach-types.h>
29
30 #include "soc_common.h"
31
32 /*
33  * These are a list of interrupt sources that provokes a polled
34  * check of status
35  */
36 static struct pcmcia_irqs irqs[] = {
37         { 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
38         { 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
39 };
40
41 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
42 {
43         uint16_t ver;
44
45         ver = __raw_readw(BALLOON3_FPGA_VER);
46         if (ver < 0x4f08)
47                 pr_warn("The FPGA code, version 0x%04x, is too old. "
48                         "PCMCIA/CF support might be broken in this version!",
49                         ver);
50
51         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
52         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
53 }
54
55 static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
56 {
57         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
58 }
59
60 static unsigned long balloon3_pcmcia_status[2] = {
61         BALLOON3_CF_nSTSCHG_BVD1,
62         BALLOON3_CF_nSTSCHG_BVD1
63 };
64
65 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
66                                     struct pcmcia_state *state)
67 {
68         uint16_t status;
69         int flip;
70
71         /* This actually reads the STATUS register */
72         status = __raw_readw(BALLOON3_CF_STATUS_REG);
73         flip = (status ^ balloon3_pcmcia_status[skt->nr])
74                 & BALLOON3_CF_nSTSCHG_BVD1;
75         /*
76          * Workaround for STSCHG which can't be deasserted:
77          * We therefore disable/enable corresponding IRQs
78          * as needed to avoid IRQ locks.
79          */
80         if (flip) {
81                 balloon3_pcmcia_status[skt->nr] = status;
82                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
83                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
84                 else
85                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
86         }
87
88         state->detect   = !gpio_get_value(BALLOON3_GPIO_S0_CD);
89         state->ready    = !!(status & BALLOON3_CF_nIRQ);
90         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
91         state->bvd2     = 0;    /* not available */
92         state->vs_3v    = 1;    /* Always true its a CF card */
93         state->vs_Xv    = 0;    /* not available */
94         state->wrprot   = 0;    /* not available */
95 }
96
97 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
98                                        const socket_state_t *state)
99 {
100         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG |
101                         ((state->flags & SS_RESET) ?
102                         BALLOON3_FPGA_SETnCLR : 0));
103         return 0;
104 }
105
106 static struct pcmcia_low_level balloon3_pcmcia_ops = {
107         .owner                  = THIS_MODULE,
108         .hw_init                = balloon3_pcmcia_hw_init,
109         .hw_shutdown            = balloon3_pcmcia_hw_shutdown,
110         .socket_state           = balloon3_pcmcia_socket_state,
111         .configure_socket       = balloon3_pcmcia_configure_socket,
112         .first                  = 0,
113         .nr                     = 1,
114 };
115
116 static struct platform_device *balloon3_pcmcia_device;
117
118 static int __init balloon3_pcmcia_init(void)
119 {
120         int ret;
121
122         if (!machine_is_balloon3())
123                 return -ENODEV;
124
125         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
126         if (!balloon3_pcmcia_device)
127                 return -ENOMEM;
128
129         ret = platform_device_add_data(balloon3_pcmcia_device,
130                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
131
132         if (!ret)
133                 ret = platform_device_add(balloon3_pcmcia_device);
134
135         if (ret)
136                 platform_device_put(balloon3_pcmcia_device);
137
138         return ret;
139 }
140
141 static void __exit balloon3_pcmcia_exit(void)
142 {
143         platform_device_unregister(balloon3_pcmcia_device);
144 }
145
146 module_init(balloon3_pcmcia_init);
147 module_exit(balloon3_pcmcia_exit);
148
149 MODULE_LICENSE("GPL");
150 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
151 MODULE_ALIAS("platform:pxa2xx-pcmcia");
152 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");