1/*
2 * linux/drivers/pcmcia/pxa2xx_mainstone.c
3 *
4 * Mainstone PCMCIA specific routines.
5 *
6 * Created:	May 12, 2004
7 * Author:	Nicolas Pitre
8 * Copyright:	MontaVista Software Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21
22#include <pcmcia/ss.h>
23
24#include <asm/mach-types.h>
25#include <asm/irq.h>
26
27#include <mach/pxa2xx-regs.h>
28#include <mach/mainstone.h>
29
30#include "soc_common.h"
31
32
33static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
34{
35	/*
36	 * Setup default state of GPIO outputs
37	 * before we enable them as outputs.
38	 */
39	if (skt->nr == 0) {
40		skt->socket.pci_irq = MAINSTONE_S0_IRQ;
41		skt->stat[SOC_STAT_CD].irq = MAINSTONE_S0_CD_IRQ;
42		skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
43		skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S0_STSCHG_IRQ;
44		skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
45	} else {
46		skt->socket.pci_irq = MAINSTONE_S1_IRQ;
47		skt->stat[SOC_STAT_CD].irq = MAINSTONE_S1_CD_IRQ;
48		skt->stat[SOC_STAT_CD].name = "PCMCIA1 CD";
49		skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S1_STSCHG_IRQ;
50		skt->stat[SOC_STAT_BVD1].name = "PCMCIA1 STSCHG";
51	}
52	return 0;
53}
54
55static unsigned long mst_pcmcia_status[2];
56
57static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
58				    struct pcmcia_state *state)
59{
60	unsigned long status, flip;
61
62	status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
63	flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;
64
65	/*
66	 * Workaround for STSCHG which can't be deasserted:
67	 * We therefore disable/enable corresponding IRQs
68	 * as needed to avoid IRQ locks.
69	 */
70	if (flip) {
71		mst_pcmcia_status[skt->nr] = status;
72		if (status & MST_PCMCIA_nSTSCHG_BVD1)
73			enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
74						   : MAINSTONE_S1_STSCHG_IRQ );
75		else
76			disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
77						    : MAINSTONE_S1_STSCHG_IRQ );
78	}
79
80	state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
81	state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
82	state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
83	state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
84	state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
85	state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
86}
87
88static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
89				       const socket_state_t *state)
90{
91	unsigned long power = 0;
92	int ret = 0;
93
94	switch (state->Vcc) {
95	case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
96	case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
97	case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
98	default:
99		 printk(KERN_ERR "%s(): bad Vcc %u\n",
100				 __func__, state->Vcc);
101		 ret = -1;
102	}
103
104	switch (state->Vpp) {
105	case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
106	case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
107	default:
108		  if(state->Vpp == state->Vcc) {
109			  power |= MST_PCMCIA_PWR_VPP_VCC;
110		  } else {
111			  printk(KERN_ERR "%s(): bad Vpp %u\n",
112					  __func__, state->Vpp);
113			  ret = -1;
114		  }
115	}
116
117	if (state->flags & SS_RESET)
118	       power |= MST_PCMCIA_RESET;
119
120	switch (skt->nr) {
121	case 0:  MST_PCMCIA0 = power; break;
122	case 1:  MST_PCMCIA1 = power; break;
123	default: ret = -1;
124	}
125
126	return ret;
127}
128
129static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
130	.owner			= THIS_MODULE,
131	.hw_init		= mst_pcmcia_hw_init,
132	.socket_state		= mst_pcmcia_socket_state,
133	.configure_socket	= mst_pcmcia_configure_socket,
134	.nr			= 2,
135};
136
137static struct platform_device *mst_pcmcia_device;
138
139static int __init mst_pcmcia_init(void)
140{
141	int ret;
142
143	if (!machine_is_mainstone())
144		return -ENODEV;
145
146	mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
147	if (!mst_pcmcia_device)
148		return -ENOMEM;
149
150	ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
151				       sizeof(mst_pcmcia_ops));
152	if (ret == 0)
153		ret = platform_device_add(mst_pcmcia_device);
154
155	if (ret)
156		platform_device_put(mst_pcmcia_device);
157
158	return ret;
159}
160
161static void __exit mst_pcmcia_exit(void)
162{
163	platform_device_unregister(mst_pcmcia_device);
164}
165
166fs_initcall(mst_pcmcia_init);
167module_exit(mst_pcmcia_exit);
168
169MODULE_LICENSE("GPL");
170MODULE_ALIAS("platform:pxa2xx-pcmcia");
171