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 <plat/orion-gpio.h>
  17#include <plat/mpp.h>
  18
  19/* Address of the ith MPP control register */
  20static __init void __iomem *mpp_ctrl_addr(unsigned int i,
  21                                          void __iomem *dev_bus)
  22{
  23        return dev_bus + (i) * 4;
  24}
  25
  26
  27void __init orion_mpp_conf(unsigned int *mpp_list, unsigned int variant_mask,
  28                           unsigned int mpp_max, void __iomem *dev_bus)
  29{
  30        unsigned int mpp_nr_regs = (1 + mpp_max/8);
  31        u32 mpp_ctrl[8];
  32        int i;
  33
  34        printk(KERN_DEBUG "initial MPP regs:");
  35        if (mpp_nr_regs > ARRAY_SIZE(mpp_ctrl)) {
  36                printk(KERN_ERR "orion_mpp_conf: invalid mpp_max\n");
  37                return;
  38        }
  39
  40        for (i = 0; i < mpp_nr_regs; i++) {
  41                mpp_ctrl[i] = readl(mpp_ctrl_addr(i, dev_bus));
  42                printk(" %08x", mpp_ctrl[i]);
  43        }
  44        printk("\n");
  45
  46        for ( ; *mpp_list; mpp_list++) {
  47                unsigned int num = MPP_NUM(*mpp_list);
  48                unsigned int sel = MPP_SEL(*mpp_list);
  49                int shift, gpio_mode;
  50
  51                if (num > mpp_max) {
  52                        printk(KERN_ERR "orion_mpp_conf: invalid MPP "
  53                                        "number (%u)\n", num);
  54                        continue;
  55                }
  56                if (variant_mask && !(*mpp_list & variant_mask)) {
  57                        printk(KERN_WARNING
  58                               "orion_mpp_conf: requested MPP%u config "
  59                               "unavailable on this hardware\n", num);
  60                        continue;
  61                }
  62
  63                shift = (num & 7) << 2;
  64                mpp_ctrl[num / 8] &= ~(0xf << shift);
  65                mpp_ctrl[num / 8] |= sel << shift;
  66
  67                gpio_mode = 0;
  68                if (*mpp_list & MPP_INPUT_MASK)
  69                        gpio_mode |= GPIO_INPUT_OK;
  70                if (*mpp_list & MPP_OUTPUT_MASK)
  71                        gpio_mode |= GPIO_OUTPUT_OK;
  72
  73                orion_gpio_set_valid(num, gpio_mode);
  74        }
  75
  76        printk(KERN_DEBUG "  final MPP regs:");
  77        for (i = 0; i < mpp_nr_regs; i++) {
  78                writel(mpp_ctrl[i], mpp_ctrl_addr(i, dev_bus));
  79                printk(" %08x", mpp_ctrl[i]);
  80        }
  81        printk("\n");
  82}
  83