LXR linux/arch/arm/plat-orion/mpp.c

   1/*
   2 * arch/arm/plat-orion/mpp.c
   3 *
   4 * MPP functions for Marvell orion SoCs
   5 *
   6 * This file is licensed under the terms of the GNU General Public
   7 * License version 2.  This program is licensed "as is" without any
   8 * warranty of any kind, whether express or implied.
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/init.h>
  13#include <linux/mbus.h>
  14#include <linux/io.h>
  15#include <linux/gpio.h>
  16#include <mach/hardware.h>
  17#include <plat/orion-gpio.h>
  18#include <plat/mpp.h>
  19
  20/* Address of the ith MPP control register */
  21static __init void __iomem *mpp_ctrl_addr(unsigned int i,
  22                                          void __iomem *dev_bus)
  23{
  24        return dev_bus + (i) * 4;
  25}
  26
  27
  28void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask,
  29                           unsigned int mpp_max, void __iomem *dev_bus)
  30{
  31        unsigned int mpp_nr_regs = (1 + mpp_max/8);
  32        u32 mpp_ctrl[mpp_nr_regs];
  33        int i;
  34
  35        printk(KERN_DEBUG "initial MPP regs:");
  36        for (i = 0; i < mpp_nr_regs; i++) {
  37                mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus));
  38                printk(" %08x", mpp_ctrl[i]);
  39        }
  40        printk("\n");
  41
  42        for ( ; *mpp_list; mpp_list++) {
  43                unsigned int num = MPP_NUM(*mpp_list);
  44                unsigned int sel = MPP_SEL(*mpp_list);
  45                int shift, gpio_mode;
  46
  47                if (num > mpp_max) {
  48                        printk(KERN_ERR "orion_mpp_conf: invalid MPP "
  49                                        "number (%u)\n", num);
  50                        continue;
  51                }
  52                if (variant_mask && !(*mpp_list & variant_mask)) {
  53                        printk(KERN_WARNING
  54                               "orion_mpp_conf: requested MPP%u config "
  55                               "unavailable on this hardware\n", num);
  56                        continue;
  57                }
  58
  59                shift = (num & 7) << 2;
  60                mpp_ctrl[num / 8] &= ~(0xf << shift);
  61                mpp_ctrl[num / 8] |= sel << shift;
  62
  63                gpio_mode = 0;
  64                if (*mpp_list & MPP_INPUT_MASK)
  65                        gpio_mode |= GPIO_INPUT_OK;
  66                if (*mpp_list & MPP_OUTPUT_MASK)
  67                        gpio_mode |= GPIO_OUTPUT_OK;
  68
  69                orion_gpio_set_valid(num, gpio_mode);
  70        }
  71
  72        printk(KERN_DEBUG "  final MPP regs:");
  73        for (i = 0; i < mpp_nr_regs; i++) {
  74                writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus));
  75                printk(" %08x", mpp_ctrl[i]);
  76        }
  77        printk("\n");
  78}
  79