LXR linux/include/linux/reset/bcm63xx

   1/*
   2 * Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset)
   3 *
   4 * Copyright (C) 2015, Broadcom Corporation
   5 * Author: Florian Fainelli <f.fainelli@gmail.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation version 2.
  10 *
  11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12 * kind, whether express or implied; without even the implied warranty
  13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 */
  16#ifndef __BCM63XX_PMB_H
  17#define __BCM63XX_PMB_H
  18
  19#include <linux/io.h>
  20#include <linux/types.h>
  21#include <linux/delay.h>
  22#include <linux/err.h>
  23
  24/* PMB Master controller register */
  25#define PMB_CTRL                0x00
  26#define  PMC_PMBM_START         (1 << 31)
  27#define  PMC_PMBM_TIMEOUT       (1 << 30)
  28#define  PMC_PMBM_SLAVE_ERR     (1 << 29)
  29#define  PMC_PMBM_BUSY          (1 << 28)
  30#define  PMC_PMBM_READ          (0 << 20)
  31#define  PMC_PMBM_WRITE         (1 << 20)
  32#define PMB_WR_DATA             0x04
  33#define PMB_TIMEOUT             0x08
  34#define PMB_RD_DATA             0x0C
  35
  36#define PMB_BUS_ID_SHIFT        8
  37
  38/* Perform the low-level PMB master operation, shared between reads and
  39 * writes.
  40 */
  41static inline int __bpcm_do_op(void __iomem *master, unsigned int addr,
  42                               u32 off, u32 op)
  43{
  44        unsigned int timeout = 1000;
  45        u32 cmd;
  46
  47        cmd = (PMC_PMBM_START | op | (addr & 0xff) << 12 | off);
  48        writel(cmd, master + PMB_CTRL);
  49        do {
  50                cmd = readl(master + PMB_CTRL);
  51                if (!(cmd & PMC_PMBM_START))
  52                        return 0;
  53
  54                if (cmd & PMC_PMBM_SLAVE_ERR)
  55                        return -EIO;
  56
  57                if (cmd & PMC_PMBM_TIMEOUT)
  58                        return -ETIMEDOUT;
  59
  60                udelay(1);
  61        } while (timeout-- > 0);
  62
  63        return -ETIMEDOUT;
  64}
  65
  66static inline int bpcm_rd(void __iomem *master, unsigned int addr,
  67                          u32 off, u32 *val)
  68{
  69        int ret = 0;
  70
  71        ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_READ);
  72        *val = readl(master + PMB_RD_DATA);
  73
  74        return ret;
  75}
  76
  77static inline int bpcm_wr(void __iomem *master, unsigned int addr,
  78                          u32 off, u32 val)
  79{
  80        int ret = 0;
  81
  82        writel(val, master + PMB_WR_DATA);
  83        ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_WRITE);
  84
  85        return ret;
  86}
  87
  88#endif /* __BCM63XX_PMB_H */
  89