arch/arm/mach-mv78xx0/mpp.c

   1 /*
   2  * arch/arm/mach-mv78x00/mpp.c
   3  *
   4  * MPP functions for Marvell MV78x00 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 <asm/gpio.h>
  16 #include <mach/hardware.h>
  17 #include "common.h"
  18 #include "mpp.h"
  19
  20 static unsigned int __init mv78xx0_variant(void)
  21 {
  22         u32 dev, rev;
  23
  24         mv78xx0_pcie_id(&dev, &rev);
  25
  26         if (dev == MV78100_DEV_ID && rev >= MV78100_REV_A0)
  27                 return MPP_78100_A0_MASK;
  28
  29         printk(KERN_ERR "MPP setup: unknown mv78x00 variant "
  30                         "(dev %#x rev %#x)\n", dev, rev);
  31         return 0;
  32 }
  33
  34 #define MPP_CTRL(i)     (DEV_BUS_VIRT_BASE + (i) * 4)
  35 #define MPP_NR_REGS     (1 + MPP_MAX/8)
  36
  37 void __init mv78xx0_mpp_conf(unsigned int *mpp_list)
  38 {
  39         u32 mpp_ctrl[MPP_NR_REGS];
  40         unsigned int variant_mask;
  41         int i;
  42
  43         variant_mask = mv78xx0_variant();
  44         if (!variant_mask)
  45                 return;
  46
  47         /* Initialize gpiolib. */
  48         orion_gpio_init();
  49
  50         printk(KERN_DEBUG "initial MPP regs:");
  51         for (i = 0; i < MPP_NR_REGS; i++) {
  52                 mpp_ctrl[i] = readl(MPP_CTRL(i));
  53                 printk(" %08x", mpp_ctrl[i]);
  54         }
  55         printk("\n");
  56
  57         for ( ; *mpp_list; mpp_list++) {
  58                 unsigned int num = MPP_NUM(*mpp_list);
  59                 unsigned int sel = MPP_SEL(*mpp_list);
  60                 int shift, gpio_mode;
  61
  62                 if (num > MPP_MAX) {
  63                         printk(KERN_ERR "mv78xx0_mpp_conf: invalid MPP "
  64                                         "number (%u)\n", num);
  65                         continue;
  66                 }
  67                 if (!(*mpp_list & variant_mask)) {
  68                         printk(KERN_WARNING
  69                                         "mv78xx0_mpp_conf: requested MPP%u config "
  70                                         "unavailable on this hardware\n", num);
  71                         continue;
  72                 }
  73
  74                 shift = (num & 7) << 2;
  75                 mpp_ctrl[num / 8] &= ~(0xf << shift);
  76                 mpp_ctrl[num / 8] |= sel << shift;
  77
  78                 gpio_mode = 0;
  79                 if (*mpp_list & MPP_INPUT_MASK)
  80                         gpio_mode |= GPIO_INPUT_OK;
  81                 if (*mpp_list & MPP_OUTPUT_MASK)
  82                         gpio_mode |= GPIO_OUTPUT_OK;
  83                 if (sel != 0)
  84                         gpio_mode = 0;
  85                 orion_gpio_set_valid(num, gpio_mode);
  86         }
  87
  88         printk(KERN_DEBUG "  final MPP regs:");
  89         for (i = 0; i < MPP_NR_REGS; i++) {
  90                 writel(mpp_ctrl[i], MPP_CTRL(i));
  91                 printk(" %08x", mpp_ctrl[i]);
  92         }
  93         printk("\n");
  94 }