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pinmux.c

/*
 * Allocator for I/O pins. All pins are allocated to GPIO at bootup.
 * Unassigned pins and GPIO pins can be allocated to a fixed interface
 * or the I/O processor instead.
 *
 * Copyright (c) 2004 Axis Communications AB.
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <asm/arch/hwregs/reg_map.h>
#include <asm/arch/hwregs/reg_rdwr.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/hwregs/pinmux_defs.h>

#undef DEBUG

#define PORT_PINS 18
#define PORTS 4

static char pins[PORTS][PORT_PINS];
static DEFINE_SPINLOCK(pinmux_lock);

static void crisv32_pinmux_set(int port);

int
crisv32_pinmux_init(void)
{
      static int initialized = 0;

      if (!initialized) {
            reg_pinmux_rw_pa pa = REG_RD(pinmux, regi_pinmux, rw_pa);
            initialized = 1;
            pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 =
            pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes;
            REG_WR(pinmux, regi_pinmux, rw_pa, pa);
            crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio);
            crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio);
            crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio);
            crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio);
      }

      return 0;
}

int
crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode)
{
      int i;
      unsigned long flags;

      crisv32_pinmux_init();

      if (port > PORTS)
            return -EINVAL;

      spin_lock_irqsave(&pinmux_lock, flags);

      for (i = first_pin; i <= last_pin; i++)
      {
            if ((pins[port][i] != pinmux_none) && (pins[port][i] != pinmux_gpio) &&
                (pins[port][i] != mode))
            {
                  spin_unlock_irqrestore(&pinmux_lock, flags);
#ifdef DEBUG
                  panic("Pinmux alloc failed!\n");
#endif
                  return -EPERM;
            }
      }

      for (i = first_pin; i <= last_pin; i++)
            pins[port][i] = mode;

      crisv32_pinmux_set(port);

      spin_unlock_irqrestore(&pinmux_lock, flags);

      return 0;
}

int
crisv32_pinmux_alloc_fixed(enum fixed_function function)
{
      int ret = -EINVAL;
      char saved[sizeof pins];
      unsigned long flags;

      spin_lock_irqsave(&pinmux_lock, flags);

      /* Save internal data for recovery */
      memcpy(saved, pins, sizeof pins);

      reg_pinmux_rw_hwprot hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);

      switch(function)
      {
      case pinmux_ser1:
            ret = crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed);
            hwprot.ser1 = regk_pinmux_yes;
            break;
      case pinmux_ser2:
            ret = crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed);
            hwprot.ser2 = regk_pinmux_yes;
            break;
      case pinmux_ser3:
            ret = crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed);
            hwprot.ser3 = regk_pinmux_yes;
            break;
      case pinmux_sser0:
            ret = crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
            hwprot.sser0 = regk_pinmux_yes;
            break;
      case pinmux_sser1:
            ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
            hwprot.sser1 = regk_pinmux_yes;
            break;
      case pinmux_ata0:
            ret = crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed);
            hwprot.ata0 = regk_pinmux_yes;
            break;
      case pinmux_ata1:
            ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed);
            hwprot.ata1 = regk_pinmux_yes;
            break;
      case pinmux_ata2:
            ret = crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed);
            hwprot.ata2 = regk_pinmux_yes;
            break;
      case pinmux_ata3:
            ret = crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed);
            hwprot.ata2 = regk_pinmux_yes;
            break;
      case pinmux_ata:
            ret = crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed);
            ret |= crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed);
            hwprot.ata = regk_pinmux_yes;
            break;
      case pinmux_eth1:
            ret = crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed);
            hwprot.eth1 = regk_pinmux_yes;
            hwprot.eth1_mgm = regk_pinmux_yes;
            break;
      case pinmux_timer:
            ret = crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed);
            hwprot.timer = regk_pinmux_yes;
            spin_unlock_irqrestore(&pinmux_lock, flags);
            return ret;
      }

      if (!ret)
            REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
      else
            memcpy(pins, saved, sizeof pins);

  spin_unlock_irqrestore(&pinmux_lock, flags);

  return ret;
}

void
crisv32_pinmux_set(int port)
{
      int i;
      int gpio_val = 0;
      int iop_val = 0;

      for (i = 0; i < PORT_PINS; i++)
      {
            if (pins[port][i] == pinmux_gpio)
                  gpio_val |= (1 << i);
            else if (pins[port][i] == pinmux_iop)
                  iop_val |= (1 << i);
      }

      REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_gio + 8*port, gpio_val);
      REG_WRITE(int, regi_pinmux + REG_RD_ADDR_pinmux_rw_pb_iop + 8*port, iop_val);

#ifdef DEBUG
       crisv32_pinmux_dump();
#endif
}

int
crisv32_pinmux_dealloc(int port, int first_pin, int last_pin)
{
      int i;
      unsigned long flags;

      crisv32_pinmux_init();

      if (port > PORTS)
            return -EINVAL;

      spin_lock_irqsave(&pinmux_lock, flags);

      for (i = first_pin; i <= last_pin; i++)
            pins[port][i] = pinmux_none;

      crisv32_pinmux_set(port);
      spin_unlock_irqrestore(&pinmux_lock, flags);

      return 0;
}

void
crisv32_pinmux_dump(void)
{
      int i, j;

      crisv32_pinmux_init();

      for (i = 0; i < PORTS; i++)
      {
            printk("Port %c\n", 'B'+i);
            for (j = 0; j < PORT_PINS; j++)
                  printk("  Pin %d = %d\n", j, pins[i][j]);
      }
}

__initcall(crisv32_pinmux_init);

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