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Marek Vasuta9c06292010-07-27 21:48:10 +02001/*
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
Dmitry Eremin-Solenikovaf21cbb2011-04-01 13:28:45 +040028#include <asm/mach-types.h>
29
Marek Vasuta9c06292010-07-27 21:48:10 +020030#include "soc_common.h"
31
32/*
33 * These are a list of interrupt sources that provokes a polled
34 * check of status
35 */
36static struct pcmcia_irqs irqs[] = {
37 { 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
38 { 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
39};
40
41static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
42{
43 uint16_t ver;
Marek Vasuta9c06292010-07-27 21:48:10 +020044
45 ver = __raw_readw(BALLOON3_FPGA_VER);
Marek Vasut1b9169d2010-10-19 16:19:32 +020046 if (ver < 0x4f08)
47 pr_warn("The FPGA code, version 0x%04x, is too old. "
Marek Vasuta9c06292010-07-27 21:48:10 +020048 "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
55static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
56{
57 soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
58}
59
60static unsigned long balloon3_pcmcia_status[2] = {
61 BALLOON3_CF_nSTSCHG_BVD1,
62 BALLOON3_CF_nSTSCHG_BVD1
63};
64
65static 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
97static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
98 const socket_state_t *state)
99{
Marek Vasut1b9169d2010-10-19 16:19:32 +0200100 __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG |
101 ((state->flags & SS_RESET) ?
102 BALLOON3_FPGA_SETnCLR : 0));
Marek Vasuta9c06292010-07-27 21:48:10 +0200103 return 0;
104}
105
Marek Vasuta9c06292010-07-27 21:48:10 +0200106static 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,
Marek Vasuta9c06292010-07-27 21:48:10 +0200112 .first = 0,
113 .nr = 1,
114};
115
116static struct platform_device *balloon3_pcmcia_device;
117
118static int __init balloon3_pcmcia_init(void)
119{
120 int ret;
121
Dmitry Eremin-Solenikovaf21cbb2011-04-01 13:28:45 +0400122 if (!machine_is_balloon3())
123 return -ENODEV;
124
Marek Vasuta9c06292010-07-27 21:48:10 +0200125 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
141static void __exit balloon3_pcmcia_exit(void)
142{
143 platform_device_unregister(balloon3_pcmcia_device);
144}
145
146module_init(balloon3_pcmcia_init);
147module_exit(balloon3_pcmcia_exit);
148
149MODULE_LICENSE("GPL");
150MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
151MODULE_ALIAS("platform:pxa2xx-pcmcia");
152MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");