LXR uboot/arch/arm/cpu/arm926ejs/kirkwood/mpp.c

   1/*
   2 * arch/arm/mach-kirkwood/mpp.c
   3 *
   4 * MPP functions for Marvell Kirkwood SoCs
   5 * Referenced from Linux kernel source
   6 *
   7 * This file is licensed under the terms of the GNU General Public
   8 * License version 2.  This program is licensed "as is" without any
   9 * warranty of any kind, whether express or implied.
  10 */
  11
  12#include <common.h>
  13#include <asm/io.h>
  14#include <asm/arch/cpu.h>
  15#include <asm/arch/kirkwood.h>
  16#include <asm/arch/mpp.h>
  17
  18static u32 kirkwood_variant(void)
  19{
  20        switch (readl(KW_REG_DEVICE_ID) & 0x03) {
  21        case 1:
  22                return MPP_F6192_MASK;
  23        case 2:
  24                return MPP_F6281_MASK;
  25        default:
  26                debug("MPP setup: unknown kirkwood variant\n");
  27                return 0;
  28        }
  29}
  30
  31#define MPP_CTRL(i)     (KW_MPP_BASE + (i* 4))
  32#define MPP_NR_REGS     (1 + MPP_MAX/8)
  33
  34void kirkwood_mpp_conf(u32 *mpp_list)
  35{
  36        u32 mpp_ctrl[MPP_NR_REGS];
  37        unsigned int variant_mask;
  38        int i;
  39
  40        variant_mask = kirkwood_variant();
  41        if (!variant_mask)
  42                return;
  43
  44        debug( "initial MPP regs:");
  45        for (i = 0; i < MPP_NR_REGS; i++) {
  46                mpp_ctrl[i] = readl(MPP_CTRL(i));
  47                debug(" %08x", mpp_ctrl[i]);
  48        }
  49        debug("\n");
  50
  51
  52        while (*mpp_list) {
  53                unsigned int num = MPP_NUM(*mpp_list);
  54                unsigned int sel = MPP_SEL(*mpp_list);
  55                int shift;
  56
  57                if (num > MPP_MAX) {
  58                        debug("kirkwood_mpp_conf: invalid MPP "
  59                                        "number (%u)\n", num);
  60                        continue;
  61                }
  62                if (!(*mpp_list & variant_mask)) {
  63                        debug("kirkwood_mpp_conf: requested MPP%u config "
  64                                "unavailable on this hardware\n", num);
  65                        continue;
  66                }
  67
  68                shift = (num & 7) << 2;
  69                mpp_ctrl[num / 8] &= ~(0xf << shift);
  70                mpp_ctrl[num / 8] |= sel << shift;
  71
  72                mpp_list++;
  73        }
  74
  75        debug("  final MPP regs:");
  76        for (i = 0; i < MPP_NR_REGS; i++) {
  77                writel(mpp_ctrl[i], MPP_CTRL(i));
  78                debug(" %08x", mpp_ctrl[i]);
  79        }
  80        debug("\n");
  81
  82}
  83