drivers/pcmcia/sa1100_nanoengine.c

   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
  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  */
  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
 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
 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  */
 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  */
 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
 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