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                 return MPP_F6281_MASK;
  28         if (dev == MV88F6192_DEV_ID && rev >= MV88F6192_REV_A0)
  29                 return MPP_F6192_MASK;
  30         if (dev == MV88F6180_DEV_ID)
  31                 return MPP_F6180_MASK;
  32
  33         printk(KERN_ERR "MPP setup: unknown kirkwood variant "
  34                         "(dev %#x rev %#x)\n", dev, rev);
  35         return 0;
  36 }
  37
  38 #define MPP_CTRL(i)     (DEV_BUS_VIRT_BASE + (i) * 4)
  39 #define MPP_NR_REGS     (1 + MPP_MAX/8)
  40
  41 void __init kirkwood_mpp_conf(unsigned int *mpp_list)
  42 {
  43         u32 mpp_ctrl[MPP_NR_REGS];
  44         unsigned int variant_mask;
  45         int i;
  46
  47         variant_mask = kirkwood_variant();
  48         if (!variant_mask)
  49                 return;
  50
  51         /* Initialize gpiolib. */
  52         orion_gpio_init();
  53
  54         printk(KERN_DEBUG "initial MPP regs:");
  55         for (i = 0; i < MPP_NR_REGS; i++) {
  56                 mpp_ctrl[i] = readl(MPP_CTRL(i));
  57                 printk(" %08x", mpp_ctrl[i]);
  58         }
  59         printk("\n");
  60
  61         while (*mpp_list) {
  62                 unsigned int num = MPP_NUM(*mpp_list);
  63                 unsigned int sel = MPP_SEL(*mpp_list);
  64                 int shift, gpio_mode;
  65
  66                 if (num > MPP_MAX) {
  67                         printk(KERN_ERR "kirkwood_mpp_conf: invalid MPP "
  68                                         "number (%u)\n", num);
  69                         continue;
  70                 }
  71                 if (!(*mpp_list & variant_mask)) {
  72                         printk(KERN_WARNING
  73                                "kirkwood_mpp_conf: requested MPP%u config "
  74                                "unavailable on this hardware\n", num);
  75                         continue;
  76                 }
  77
  78                 shift = (num & 7) << 2;
  79                 mpp_ctrl[num / 8] &= ~(0xf << shift);
  80                 mpp_ctrl[num / 8] |= sel << shift;
  81
  82                 gpio_mode = 0;
  83                 if (*mpp_list & MPP_INPUT_MASK)
  84                         gpio_mode |= GPIO_INPUT_OK;
  85                 if (*mpp_list & MPP_OUTPUT_MASK)
  86                         gpio_mode |= GPIO_OUTPUT_OK;
  87                 if (sel != 0)
  88                         gpio_mode = 0;
  89                 orion_gpio_set_valid(num, gpio_mode);
  90
  91                 mpp_list++;
  92         }
  93
  94         printk(KERN_DEBUG "  final MPP regs:");
  95         for (i = 0; i < MPP_NR_REGS; i++) {
  96                 writel(mpp_ctrl[i], MPP_CTRL(i));
  97                 printk(" %08x", mpp_ctrl[i]);
  98         }
  99         printk("\n");
 100 }