1 /*
2 * drivers/pcmcia/sa1100_nanoengine.c
3 *
4 * PCMCIA implementation routines for BSI nanoEngine.
5 *
6 * In order to have a fully functional pcmcia subsystem in a BSE nanoEngine
7 * board you should carefully read this:
8 * http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/
9 *
10 * Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
11 *
12 * Based on original work for kernel 2.4 by
13 * Miguel Freitas <miguel@cpti.cetuc.puc-rio.br>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
18 *
19 */
20 #include <linux/device.h>
21 #include <linux/errno.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/signal.h>
28
29 #include <asm/mach-types.h>
30 #include <asm/irq.h>
31
32 #include <mach/hardware.h>
33 #include <mach/nanoengine.h>
34
35 #include "sa1100_generic.h"
36
37 static struct pcmcia_irqs irqs_skt0[] = {
38 /* socket, IRQ, name */
39 { 0, NANOENGINE_IRQ_GPIO_PC_CD0, "PC CD0" },
40 };
41
42 static struct pcmcia_irqs irqs_skt1[] = {
43 /* socket, IRQ, name */
44 { 1, NANOENGINE_IRQ_GPIO_PC_CD1, "PC CD1" },
45 };
46
47 struct nanoengine_pins {
48 unsigned input_pins;
49 unsigned output_pins;
50 unsigned clear_outputs;
51 unsigned transition_pins;
52 unsigned pci_irq;
53 struct pcmcia_irqs *pcmcia_irqs;
54 unsigned pcmcia_irqs_size;
55 };
56
57 static struct nanoengine_pins nano_skts[] = {
58 {
59 .input_pins = GPIO_PC_READY0 | GPIO_PC_CD0,
60 .output_pins = GPIO_PC_RESET0,
61 .clear_outputs = GPIO_PC_RESET0,
62 .transition_pins = NANOENGINE_IRQ_GPIO_PC_CD0,
63 .pci_irq = NANOENGINE_IRQ_GPIO_PC_READY0,
64 .pcmcia_irqs = irqs_skt0,
65 .pcmcia_irqs_size = ARRAY_SIZE(irqs_skt0)
66 }, {
67 .input_pins = GPIO_PC_READY1 | GPIO_PC_CD1,
68 .output_pins = GPIO_PC_RESET1,
69 .clear_outputs = GPIO_PC_RESET1,
70 .transition_pins = NANOENGINE_IRQ_GPIO_PC_CD1,
71 .pci_irq = NANOENGINE_IRQ_GPIO_PC_READY1,
72 .pcmcia_irqs = irqs_skt1,
73 .pcmcia_irqs_size = ARRAY_SIZE(irqs_skt1)
74 }
75 };
76
77 unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);
78
nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket * skt)79 static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
80 {
81 unsigned i = skt->nr;
82
83 if (i >= num_nano_pcmcia_sockets)
84 return -ENXIO;
85
86 GPDR &= ~nano_skts[i].input_pins;
87 GPDR |= nano_skts[i].output_pins;
88 GPCR = nano_skts[i].clear_outputs;
89 irq_set_irq_type(nano_skts[i].transition_pins, IRQ_TYPE_EDGE_BOTH);
90 skt->socket.pci_irq = nano_skts[i].pci_irq;
91
92 return soc_pcmcia_request_irqs(skt,
93 nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
94 }
95
96 /*
97 * Release all resources.
98 */
nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket * skt)99 static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
100 {
101 unsigned i = skt->nr;
102
103 if (i >= num_nano_pcmcia_sockets)
104 return;
105
106 soc_pcmcia_free_irqs(skt,
107 nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
108 }
109
nanoengine_pcmcia_configure_socket(struct soc_pcmcia_socket * skt,const socket_state_t * state)110 static int nanoengine_pcmcia_configure_socket(
111 struct soc_pcmcia_socket *skt, const socket_state_t *state)
112 {
113 unsigned reset;
114 unsigned i = skt->nr;
115
116 if (i >= num_nano_pcmcia_sockets)
117 return -ENXIO;
118
119 switch (i) {
120 case 0:
121 reset = GPIO_PC_RESET0;
122 break;
123 case 1:
124 reset = GPIO_PC_RESET1;
125 break;
126 default:
127 return -ENXIO;
128 }
129
130 if (state->flags & SS_RESET)
131 GPSR = reset;
132 else
133 GPCR = reset;
134
135 return 0;
136 }
137
nanoengine_pcmcia_socket_state(struct soc_pcmcia_socket * skt,struct pcmcia_state * state)138 static void nanoengine_pcmcia_socket_state(
139 struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
140 {
141 unsigned long levels = GPLR;
142 unsigned i = skt->nr;
143
144 if (i >= num_nano_pcmcia_sockets)
145 return;
146
147 memset(state, 0, sizeof(struct pcmcia_state));
148 switch (i) {
149 case 0:
150 state->ready = (levels & GPIO_PC_READY0) ? 1 : 0;
151 state->detect = !(levels & GPIO_PC_CD0) ? 1 : 0;
152 break;
153 case 1:
154 state->ready = (levels & GPIO_PC_READY1) ? 1 : 0;
155 state->detect = !(levels & GPIO_PC_CD1) ? 1 : 0;
156 break;
157 default:
158 return;
159 }
160 state->bvd1 = 1;
161 state->bvd2 = 1;
162 state->wrprot = 0; /* Not available */
163 state->vs_3v = 1; /* Can only apply 3.3V */
164 state->vs_Xv = 0;
165 }
166
167 /*
168 * Enable card status IRQs on (re-)initialisation. This can
169 * be called at initialisation, power management event, or
170 * pcmcia event.
171 */
nanoengine_pcmcia_socket_init(struct soc_pcmcia_socket * skt)172 static void nanoengine_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
173 {
174 unsigned i = skt->nr;
175
176 if (i >= num_nano_pcmcia_sockets)
177 return;
178
179 soc_pcmcia_enable_irqs(skt,
180 nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
181 }
182
183 /*
184 * Disable card status IRQs on suspend.
185 */
nanoengine_pcmcia_socket_suspend(struct soc_pcmcia_socket * skt)186 static void nanoengine_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
187 {
188 unsigned i = skt->nr;
189
190 if (i >= num_nano_pcmcia_sockets)
191 return;
192
193 soc_pcmcia_disable_irqs(skt,
194 nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
195 }
196
197 static struct pcmcia_low_level nanoengine_pcmcia_ops = {
198 .owner = THIS_MODULE,
199
200 .hw_init = nanoengine_pcmcia_hw_init,
201 .hw_shutdown = nanoengine_pcmcia_hw_shutdown,
202
203 .configure_socket = nanoengine_pcmcia_configure_socket,
204 .socket_state = nanoengine_pcmcia_socket_state,
205 .socket_init = nanoengine_pcmcia_socket_init,
206 .socket_suspend = nanoengine_pcmcia_socket_suspend,
207 };
208
pcmcia_nanoengine_init(struct device * dev)209 int pcmcia_nanoengine_init(struct device *dev)
210 {
211 int ret = -ENODEV;
212
213 if (machine_is_nanoengine())
214 ret = sa11xx_drv_pcmcia_probe(
215 dev, &nanoengine_pcmcia_ops, 0, 2);
216
217 return ret;
218 }
219
220