drivers/pcmcia/sa1111_jornada720.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * drivers/pcmcia/sa1100_jornada720.c
   4  *
   5  * Jornada720 PCMCIA specific routines
   6  *
   7  */
   8 #include <linux/module.h>
   9 #include <linux/device.h>
  10 #include <linux/errno.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/init.h>
  13 #include <linux/io.h>
  14
  15 #include <mach/hardware.h>
  16 #include <asm/mach-types.h>
  17
  18 #include "sa1111_generic.h"
  19
  20 /*
  21  * Socket 0 power: GPIO A0
  22  * Socket 0 3V: GPIO A2
  23  * Socket 1 power: GPIO A1 & GPIO A3
  24  * Socket 1 3V: GPIO A3
  25  * Does Socket 1 3V actually do anything?
  26  */
  27 enum {
  28         J720_GPIO_PWR,
  29         J720_GPIO_3V,
  30         J720_GPIO_MAX,
  31 };
  32 struct jornada720_data {
  33         struct gpio_desc *gpio[J720_GPIO_MAX];
  34 };
  35
  36 static int jornada720_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  37 {
  38         struct device *dev = skt->socket.dev.parent;
  39         struct jornada720_data *j;
  40
  41         j = devm_kzalloc(dev, sizeof(*j), GFP_KERNEL);
  42         if (!j)
  43                 return -ENOMEM;
  44
  45         j->gpio[J720_GPIO_PWR] = devm_gpiod_get(dev, skt->nr ? "s1-power" :
  46                                                 "s0-power", GPIOD_OUT_LOW);
  47         if (IS_ERR(j->gpio[J720_GPIO_PWR]))
  48                 return PTR_ERR(j->gpio[J720_GPIO_PWR]);
  49
  50         j->gpio[J720_GPIO_3V] = devm_gpiod_get(dev, skt->nr ? "s1-3v" :
  51                                                "s0-3v", GPIOD_OUT_LOW);
  52         if (IS_ERR(j->gpio[J720_GPIO_3V]))
  53                 return PTR_ERR(j->gpio[J720_GPIO_3V]);
  54
  55         skt->driver_data = j;
  56
  57         return 0;
  58 }
  59
  60 static int
  61 jornada720_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
  62 {
  63         struct jornada720_data *j = skt->driver_data;
  64         DECLARE_BITMAP(values, J720_GPIO_MAX) = { 0, };
  65         int ret;
  66
  67         printk(KERN_INFO "%s(): config socket %d vcc %d vpp %d\n", __func__,
  68                 skt->nr, state->Vcc, state->Vpp);
  69
  70         switch (skt->nr) {
  71         case 0:
  72                 switch (state->Vcc) {
  73                 default:
  74                 case  0:
  75                         __assign_bit(J720_GPIO_PWR, values, 0);
  76                         __assign_bit(J720_GPIO_3V, values, 0);
  77                         break;
  78                 case 33:
  79                         __assign_bit(J720_GPIO_PWR, values, 1);
  80                         __assign_bit(J720_GPIO_3V, values, 1);
  81                         break;
  82                 case 50:
  83                         __assign_bit(J720_GPIO_PWR, values, 1);
  84                         __assign_bit(J720_GPIO_3V, values, 0);
  85                         break;
  86                 }
  87                 break;
  88
  89         case 1:
  90                 switch (state->Vcc) {
  91                 default:
  92                 case 0:
  93                         __assign_bit(J720_GPIO_PWR, values, 0);
  94                         __assign_bit(J720_GPIO_3V, values, 0);
  95                         break;
  96                 case 33:
  97                 case 50:
  98                         __assign_bit(J720_GPIO_PWR, values, 1);
  99                         __assign_bit(J720_GPIO_3V, values, 1);
 100                         break;
 101                 }
 102                 break;
 103
 104         default:
 105                 return -1;
 106         }
 107
 108         if (state->Vpp != state->Vcc && state->Vpp != 0) {
 109                 printk(KERN_ERR "%s(): slot cannot support VPP %u\n",
 110                         __func__, state->Vpp);
 111                 return -EPERM;
 112         }
 113
 114         ret = sa1111_pcmcia_configure_socket(skt, state);
 115         if (ret == 0)
 116                 ret = gpiod_set_array_value_cansleep(J720_GPIO_MAX, j->gpio,
 117                                                      NULL, values);
 118
 119         return ret;
 120 }
 121
 122 static struct pcmcia_low_level jornada720_pcmcia_ops = {
 123         .owner                  = THIS_MODULE,
 124         .hw_init                = jornada720_pcmcia_hw_init,
 125         .configure_socket       = jornada720_pcmcia_configure_socket,
 126         .first                  = 0,
 127         .nr                     = 2,
 128 };
 129
 130 int pcmcia_jornada720_init(struct sa1111_dev *sadev)
 131 {
 132         /* Fixme: why messing around with SA11x0's GPIO1? */
 133         GRER |= 0x00000002;
 134
 135         sa11xx_drv_pcmcia_ops(&jornada720_pcmcia_ops);
 136         return sa1111_pcmcia_add(sadev, &jornada720_pcmcia_ops,
 137                                  sa11xx_drv_pcmcia_add_one);
 138 }