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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"); |
141 |
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