LXR uboot/arch/arm/mach-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/soc.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(const u32 *mpp_list, u32 *mpp_save)
  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                unsigned int sel_save;
  56                int shift;
  57
  58                if (num > MPP_MAX) {
  59                        debug("kirkwood_mpp_conf: invalid MPP "
  60                                        "number (%u)\n", num);
  61                        continue;
  62                }
  63                if (!(*mpp_list & variant_mask)) {
  64                        debug("kirkwood_mpp_conf: requested MPP%u config "
  65                                "unavailable on this hardware\n", num);
  66                        continue;
  67                }
  68
  69                shift = (num & 7) << 2;
  70
  71                if (mpp_save) {
  72                        sel_save = (mpp_ctrl[num / 8] >> shift) & 0xf;
  73                        *mpp_save = num | (sel_save << 8) | variant_mask;
  74                        mpp_save++;
  75                }
  76
  77                mpp_ctrl[num / 8] &= ~(0xf << shift);
  78                mpp_ctrl[num / 8] |= sel << shift;
  79
  80                mpp_list++;
  81        }
  82
  83        debug("  final MPP regs:");
  84        for (i = 0; i < MPP_NR_REGS; i++) {
  85                writel(mpp_ctrl[i], MPP_CTRL(i));
  86                debug(" %08x", mpp_ctrl[i]);
  87        }
  88        debug("\n");
  89
  90}
  91