drivers/pcmcia/sa1100_generic.c

   1 /*======================================================================
   2
   3     Device driver for the PCMCIA control functionality of StrongARM
   4     SA-1100 microprocessors.
   5
   6     The contents of this file are subject to the Mozilla Public
   7     License Version 1.1 (the "License"); you may not use this file
   8     except in compliance with the License. You may obtain a copy of
   9     the License at http://www.mozilla.org/MPL/
  10
  11     Software distributed under the License is distributed on an "AS
  12     IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  13     implied. See the License for the specific language governing
  14     rights and limitations under the License.
  15
  16     The initial developer of the original code is John G. Dorsey
  17     <john+@cs.cmu.edu>.  Portions created by John G. Dorsey are
  18     Copyright (C) 1999 John G. Dorsey.  All Rights Reserved.
  19
  20     Alternatively, the contents of this file may be used under the
  21     terms of the GNU Public License version 2 (the "GPL"), in which
  22     case the provisions of the GPL are applicable instead of the
  23     above.  If you wish to allow the use of your version of this file
  24     only under the terms of the GPL and not to allow others to use
  25     your version of this file under the MPL, indicate your decision
  26     by deleting the provisions above and replace them with the notice
  27     and other provisions required by the GPL.  If you do not delete
  28     the provisions above, a recipient may use your version of this
  29     file under either the MPL or the GPL.
  30
  31 ======================================================================*/
  32
  33 #include <linux/module.h>
  34 #include <linux/gpio/consumer.h>
  35 #include <linux/init.h>
  36 #include <linux/regulator/consumer.h>
  37 #include <linux/slab.h>
  38 #include <linux/platform_device.h>
  39
  40 #include <pcmcia/ss.h>
  41
  42 #include <asm/hardware/scoop.h>
  43
  44 #include "sa1100_generic.h"
  45
  46 static const char *sa11x0_cf_gpio_names[] = {
  47         [SOC_STAT_CD] = "detect",
  48         [SOC_STAT_BVD1] = "bvd1",
  49         [SOC_STAT_BVD2] = "bvd2",
  50         [SOC_STAT_RDY] = "ready",
  51 };
  52
  53 static int sa11x0_cf_hw_init(struct soc_pcmcia_socket *skt)
  54 {
  55         struct device *dev = skt->socket.dev.parent;
  56         int i;
  57
  58         skt->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  59         if (IS_ERR(skt->gpio_reset))
  60                 return PTR_ERR(skt->gpio_reset);
  61
  62         skt->gpio_bus_enable = devm_gpiod_get_optional(dev, "bus-enable",
  63                                                        GPIOD_OUT_HIGH);
  64         if (IS_ERR(skt->gpio_bus_enable))
  65                 return PTR_ERR(skt->gpio_bus_enable);
  66
  67         skt->vcc.reg = devm_regulator_get_optional(dev, "vcc");
  68         if (IS_ERR(skt->vcc.reg))
  69                 return PTR_ERR(skt->vcc.reg);
  70
  71         if (!skt->vcc.reg)
  72                 dev_warn(dev,
  73                          "no Vcc regulator provided, ignoring Vcc controls\n");
  74
  75         for (i = 0; i < ARRAY_SIZE(sa11x0_cf_gpio_names); i++) {
  76                 skt->stat[i].name = sa11x0_cf_gpio_names[i];
  77                 skt->stat[i].desc = devm_gpiod_get_optional(dev,
  78                                         sa11x0_cf_gpio_names[i], GPIOD_IN);
  79                 if (IS_ERR(skt->stat[i].desc))
  80                         return PTR_ERR(skt->stat[i].desc);
  81         }
  82         return 0;
  83 }
  84
  85 static int sa11x0_cf_configure_socket(struct soc_pcmcia_socket *skt,
  86         const socket_state_t *state)
  87 {
  88         return soc_pcmcia_regulator_set(skt, &skt->vcc, state->Vcc);
  89 }
  90
  91 static struct pcmcia_low_level sa11x0_cf_ops = {
  92         .owner = THIS_MODULE,
  93         .hw_init = sa11x0_cf_hw_init,
  94         .socket_state = soc_common_cf_socket_state,
  95         .configure_socket = sa11x0_cf_configure_socket,
  96 };
  97
  98 int __init pcmcia_collie_init(struct device *dev);
  99
 100 static int (*sa11x0_pcmcia_legacy_hw_init[])(struct device *dev) = {
 101 #if defined(CONFIG_SA1100_H3100) || defined(CONFIG_SA1100_H3600)
 102         pcmcia_h3600_init,
 103 #endif
 104 #ifdef CONFIG_SA1100_SIMPAD
 105         pcmcia_simpad_init,
 106 #endif
 107 #ifdef CONFIG_SA1100_COLLIE
 108        pcmcia_collie_init,
 109 #endif
 110 };
 111
 112 static int sa11x0_drv_pcmcia_legacy_probe(struct platform_device *dev)
 113 {
 114         int i, ret = -ENODEV;
 115
 116         /*
 117          * Initialise any "on-board" PCMCIA sockets.
 118          */
 119         for (i = 0; i < ARRAY_SIZE(sa11x0_pcmcia_legacy_hw_init); i++) {
 120                 ret = sa11x0_pcmcia_legacy_hw_init[i](&dev->dev);
 121                 if (ret == 0)
 122                         break;
 123         }
 124
 125         return ret;
 126 }
 127
 128 static int sa11x0_drv_pcmcia_legacy_remove(struct platform_device *dev)
 129 {
 130         struct skt_dev_info *sinfo = platform_get_drvdata(dev);
 131         int i;
 132
 133         platform_set_drvdata(dev, NULL);
 134
 135         for (i = 0; i < sinfo->nskt; i++)
 136                 soc_pcmcia_remove_one(&sinfo->skt[i]);
 137
 138         return 0;
 139 }
 140
 141 static int sa11x0_drv_pcmcia_probe(struct platform_device *pdev)
 142 {
 143         struct soc_pcmcia_socket *skt;
 144         struct device *dev = &pdev->dev;
 145
 146         if (pdev->id == -1)
 147                 return sa11x0_drv_pcmcia_legacy_probe(pdev);
 148
 149         skt = devm_kzalloc(dev, sizeof(*skt), GFP_KERNEL);
 150         if (!skt)
 151                 return -ENOMEM;
 152
 153         platform_set_drvdata(pdev, skt);
 154
 155         skt->nr = pdev->id;
 156         skt->clk = devm_clk_get(dev, NULL);
 157         if (IS_ERR(skt->clk))
 158                 return PTR_ERR(skt->clk);
 159
 160         sa11xx_drv_pcmcia_ops(&sa11x0_cf_ops);
 161         soc_pcmcia_init_one(skt, &sa11x0_cf_ops, dev);
 162
 163         return sa11xx_drv_pcmcia_add_one(skt);
 164 }
 165
 166 static int sa11x0_drv_pcmcia_remove(struct platform_device *dev)
 167 {
 168         struct soc_pcmcia_socket *skt;
 169
 170         if (dev->id == -1)
 171                 return sa11x0_drv_pcmcia_legacy_remove(dev);
 172
 173         skt = platform_get_drvdata(dev);
 174
 175         soc_pcmcia_remove_one(skt);
 176
 177         return 0;
 178 }
 179
 180 static struct platform_driver sa11x0_pcmcia_driver = {
 181         .driver = {
 182                 .name           = "sa11x0-pcmcia",
 183         },
 184         .probe          = sa11x0_drv_pcmcia_probe,
 185         .remove         = sa11x0_drv_pcmcia_remove,
 186 };
 187
 188 /* sa11x0_pcmcia_init()
 189  * ^^^^^^^^^^^^^^^^^^^^
 190  *
 191  * This routine performs low-level PCMCIA initialization and then
 192  * registers this socket driver with Card Services.
 193  *
 194  * Returns: 0 on success, -ve error code on failure
 195  */
 196 static int __init sa11x0_pcmcia_init(void)
 197 {
 198         return platform_driver_register(&sa11x0_pcmcia_driver);
 199 }
 200
 201 /* sa11x0_pcmcia_exit()
 202  * ^^^^^^^^^^^^^^^^^^^^
 203  * Invokes the low-level kernel service to free IRQs associated with this
 204  * socket controller and reset GPIO edge detection.
 205  */
 206 static void __exit sa11x0_pcmcia_exit(void)
 207 {
 208         platform_driver_unregister(&sa11x0_pcmcia_driver);
 209 }
 210
 211 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
 212 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11x0 Socket Controller");
 213 MODULE_LICENSE("Dual MPL/GPL");
 214
 215 fs_initcall(sa11x0_pcmcia_init);
 216 module_exit(sa11x0_pcmcia_exit);