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mpp.c

/*
 * arch/arm/mach-kirkwood/mpp.c
 *
 * MPP functions for Marvell Kirkwood SoCs
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mbus.h>
#include <linux/io.h>
#include <asm/gpio.h>
#include <mach/hardware.h>
#include "common.h"
#include "mpp.h"

static unsigned int __init kirkwood_variant(void)
{
      u32 dev, rev;

      kirkwood_pcie_id(&dev, &rev);

      if (dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0)
            return MPP_F6281_MASK;
      if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
            return MPP_F6192_MASK;
      if (dev == MV88F6180_DEV_ID)
            return MPP_F6180_MASK;

      printk(KERN_ERR "MPP setup: unknown kirkwood variant "
                  "(dev %#x rev %#x)\n", dev, rev);
      return 0;
}

#define MPP_CTRL(i)     (DEV_BUS_VIRT_BASE + (i) * 4)
#define MPP_NR_REGS     (1 + MPP_MAX/8)

void __init kirkwood_mpp_conf(unsigned int *mpp_list)
{
      u32 mpp_ctrl[MPP_NR_REGS];
      unsigned int variant_mask;
      int i;

      variant_mask = kirkwood_variant();
      if (!variant_mask)
            return;

      /* Initialize gpiolib. */
      orion_gpio_init();

      printk(KERN_DEBUG "initial MPP regs:");
      for (i = 0; i < MPP_NR_REGS; i++) {
            mpp_ctrl[i] = readl(MPP_CTRL(i));
            printk(" %08x", mpp_ctrl[i]);
      }
      printk("\n");

      while (*mpp_list) {
            unsigned int num = MPP_NUM(*mpp_list);
            unsigned int sel = MPP_SEL(*mpp_list);
            int shift, gpio_mode;

            if (num > MPP_MAX) {
                  printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
                              "number (%u)\n", num);
                  continue;
            }
            if (!(*mpp_list & variant_mask)) {
                  printk(KERN_WARNING
                         "kirkwood_mpp_conf: requested MPP%u config "
                         "unavailable on this hardware\n", num);
                  continue;
            }

            shift = (num & 7) << 2;
            mpp_ctrl[num / 8] &= ~(0xf << shift);
            mpp_ctrl[num / 8] |= sel << shift;

            gpio_mode = 0;
            if (*mpp_list & MPP_INPUT_MASK)
                  gpio_mode |= GPIO_INPUT_OK;
            if (*mpp_list & MPP_OUTPUT_MASK)
                  gpio_mode |= GPIO_OUTPUT_OK;
            if (sel != 0)
                  gpio_mode = 0;
            orion_gpio_set_valid(num, gpio_mode);

            mpp_list++;
      }

      printk(KERN_DEBUG "  final MPP regs:");
      for (i = 0; i < MPP_NR_REGS; i++) {
            writel(mpp_ctrl[i], MPP_CTRL(i));
            printk(" %08x", mpp_ctrl[i]);
      }
      printk("\n");
}

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