Merge branch '3.4-rc1' into android-tegra-nv-3.3-rebased
[linux-2.6.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 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
33 {
34         uint16_t ver;
35
36         ver = __raw_readw(BALLOON3_FPGA_VER);
37         if (ver < 0x4f08)
38                 pr_warn("The FPGA code, version 0x%04x, is too old. "
39                         "PCMCIA/CF support might be broken in this version!",
40                         ver);
41
42         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
43         skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
44         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
45         skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
46         skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
47
48         return 0;
49 }
50
51 static unsigned long balloon3_pcmcia_status[2] = {
52         BALLOON3_CF_nSTSCHG_BVD1,
53         BALLOON3_CF_nSTSCHG_BVD1
54 };
55
56 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
57                                     struct pcmcia_state *state)
58 {
59         uint16_t status;
60         int flip;
61
62         /* This actually reads the STATUS register */
63         status = __raw_readw(BALLOON3_CF_STATUS_REG);
64         flip = (status ^ balloon3_pcmcia_status[skt->nr])
65                 & BALLOON3_CF_nSTSCHG_BVD1;
66         /*
67          * Workaround for STSCHG which can't be deasserted:
68          * We therefore disable/enable corresponding IRQs
69          * as needed to avoid IRQ locks.
70          */
71         if (flip) {
72                 balloon3_pcmcia_status[skt->nr] = status;
73                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
74                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
75                 else
76                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
77         }
78
79         state->ready    = !!(status & BALLOON3_CF_nIRQ);
80         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
81         state->bvd2     = 0;    /* not available */
82         state->vs_3v    = 1;    /* Always true its a CF card */
83         state->vs_Xv    = 0;    /* not available */
84 }
85
86 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
87                                        const socket_state_t *state)
88 {
89         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
90                         ((state->flags & SS_RESET) ?
91                         BALLOON3_FPGA_SETnCLR : 0));
92         return 0;
93 }
94
95 static struct pcmcia_low_level balloon3_pcmcia_ops = {
96         .owner                  = THIS_MODULE,
97         .hw_init                = balloon3_pcmcia_hw_init,
98         .socket_state           = balloon3_pcmcia_socket_state,
99         .configure_socket       = balloon3_pcmcia_configure_socket,
100         .first                  = 0,
101         .nr                     = 1,
102 };
103
104 static struct platform_device *balloon3_pcmcia_device;
105
106 static int __init balloon3_pcmcia_init(void)
107 {
108         int ret;
109
110         if (!machine_is_balloon3())
111                 return -ENODEV;
112
113         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
114         if (!balloon3_pcmcia_device)
115                 return -ENOMEM;
116
117         ret = platform_device_add_data(balloon3_pcmcia_device,
118                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
119
120         if (!ret)
121                 ret = platform_device_add(balloon3_pcmcia_device);
122
123         if (ret)
124                 platform_device_put(balloon3_pcmcia_device);
125
126         return ret;
127 }
128
129 static void __exit balloon3_pcmcia_exit(void)
130 {
131         platform_device_unregister(balloon3_pcmcia_device);
132 }
133
134 module_init(balloon3_pcmcia_init);
135 module_exit(balloon3_pcmcia_exit);
136
137 MODULE_LICENSE("GPL");
138 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
139 MODULE_ALIAS("platform:pxa2xx-pcmcia");
140 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");