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bcm63xx_pmb.h
/* 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 */
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