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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset)
*
* Copyright (C) 2015, Broadcom Corporation
* Author: Florian Fainelli <f.fainelli@gmail.com>
*/
#ifndef __BCM63XX_PMB_H
#define __BCM63XX_PMB_H
#include <linux/io.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/err.h>
/* PMB Master controller register */
#define PMB_CTRL 0x00
#define PMC_PMBM_START (1 << 31)
#define PMC_PMBM_TIMEOUT (1 << 30)
#define PMC_PMBM_SLAVE_ERR (1 << 29)
#define PMC_PMBM_BUSY (1 << 28)
#define PMC_PMBM_READ (0 << 20)
#define PMC_PMBM_WRITE (1 << 20)
#define PMB_WR_DATA 0x04
#define PMB_TIMEOUT 0x08
#define PMB_RD_DATA 0x0C
#define PMB_BUS_ID_SHIFT 8
/* Perform the low-level PMB master operation, shared between reads and
* writes.
*/
static inline int __bpcm_do_op(void __iomem *master, unsigned int addr,
u32 off, u32 op)
{
unsigned int timeout = 1000;
u32 cmd;
cmd = (PMC_PMBM_START | op | (addr & 0xff) << 12 | off);
writel(cmd, master + PMB_CTRL);
do {
cmd = readl(master + PMB_CTRL);
if (!(cmd & PMC_PMBM_START))
return 0;
if (cmd & PMC_PMBM_SLAVE_ERR)
return -EIO;
if (cmd & PMC_PMBM_TIMEOUT)
return -ETIMEDOUT;
udelay(1);
} while (timeout-- > 0);
return -ETIMEDOUT;
}
static inline int bpcm_rd(void __iomem *master, unsigned int addr,
u32 off, u32 *val)
{
int ret = 0;
ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_READ);
*val = readl(master + PMB_RD_DATA);
return ret;
}
static inline int bpcm_wr(void __iomem *master, unsigned int addr,
u32 off, u32 val)
{
int ret = 0;
writel(val, master + PMB_WR_DATA);
ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_WRITE);
return ret;
}
#endif /* __BCM63XX_PMB_H */