arch/arm/mach-kirkwood/mpp.c

   1 /*
   2  * arch/arm/mach-kirkwood/mpp.c
   3  *
   4  * MPP functions for Marvell Kirkwood 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 kirkwood_variant(void)
  21 {
  22         u32 dev, rev;
  23
  24         kirkwood_pcie_id(&dev, &rev);
  25
  26         if ((dev == MV88F6281_DEV_ID && rev >= MV88F6281_REV_A0) ||
  27             (dev == MV88F6282_DEV_ID))
  28                 return MPP_F6281_MASK;
  29         if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
  30                 return MPP_F6192_MASK;
  31         if (dev == MV88F6180_DEV_ID)
  32                 return MPP_F6180_MASK;
  33
  34         printk(KERN_ERR "MPP setup: unknown kirkwood variant "
  35                         "(dev %#x rev %#x)\n", dev, rev);
  36         return 0;
  37 }
  38
  39 #define MPP_CTRL(i)     (DEV_BUS_VIRT_BASE + (i) * 4)
  40 #define MPP_NR_REGS     (1 + MPP_MAX/8)
  41
  42 void __init kirkwood_mpp_conf(unsigned int *mpp_list)
  43 {
  44         u32 mpp_ctrl[MPP_NR_REGS];
  45         unsigned int variant_mask;
  46         int i;
  47
  48         variant_mask = kirkwood_variant();
  49         if (!variant_mask)
  50                 return;
  51
  52         /* Initialize gpiolib. */
  53         orion_gpio_init();
  54
  55         printk(KERN_DEBUG "initial MPP regs:");
  56         for (i = 0; i < MPP_NR_REGS; i++) {
  57                 mpp_ctrl[i] = readl(MPP_CTRL(i));
  58                 printk(" %08x", mpp_ctrl[i]);
  59         }
  60         printk("\n");
  61
  62         for ( ; *mpp_list; mpp_list++) {
  63                 unsigned int num = MPP_NUM(*mpp_list);
  64                 unsigned int sel = MPP_SEL(*mpp_list);
  65                 int shift, gpio_mode;
  66
  67                 if (num > MPP_MAX) {
  68                         printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
  69                                         "number (%u)\n", num);
  70                         continue;
  71                 }
  72                 if (!(*mpp_list & variant_mask)) {
  73                         printk(KERN_WARNING
  74                                "kirkwood_mpp_conf: requested MPP%u config "
  75                                "unavailable on this hardware\n", num);
  76                         continue;
  77                 }
  78
  79                 shift = (num & 7) << 2;
  80                 mpp_ctrl[num / 8] &= ~(0xf << shift);
  81                 mpp_ctrl[num / 8] |= sel << shift;
  82
  83                 gpio_mode = 0;
  84                 if (*mpp_list & MPP_INPUT_MASK)
  85                         gpio_mode |= GPIO_INPUT_OK;
  86                 if (*mpp_list & MPP_OUTPUT_MASK)
  87                         gpio_mode |= GPIO_OUTPUT_OK;
  88                 if (sel != 0)
  89                         gpio_mode = 0;
  90                 orion_gpio_set_valid(num, gpio_mode);
  91         }
  92
  93         printk(KERN_DEBUG "  final MPP regs:");
  94         for (i = 0; i < MPP_NR_REGS; i++) {
  95                 writel(mpp_ctrl[i], MPP_CTRL(i));
  96                 printk(" %08x", mpp_ctrl[i]);
  97         }
  98         printk("\n");
  99 }