1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset) 4 * 5 * Copyright (C) 2015, Broadcom Corporation 6 * Author: Florian Fainelli <f.fainelli@gmail.com> 7 */ 8 #ifndef __BCM63XX_PMB_H 9 #define __BCM63XX_PMB_H 10 11 #include <linux/io.h> 12 #include <linux/types.h> 13 #include <linux/delay.h> 14 #include <linux/err.h> 15 16 /* PMB Master controller register */ 17 #define PMB_CTRL 0x00 18 #define PMC_PMBM_START (1 << 31) 19 #define PMC_PMBM_TIMEOUT (1 << 30) 20 #define PMC_PMBM_SLAVE_ERR (1 << 29) 21 #define PMC_PMBM_BUSY (1 << 28) 22 #define PMC_PMBM_READ (0 << 20) 23 #define PMC_PMBM_WRITE (1 << 20) 24 #define PMB_WR_DATA 0x04 25 #define PMB_TIMEOUT 0x08 26 #define PMB_RD_DATA 0x0C 27 28 #define PMB_BUS_ID_SHIFT 8 29 30 /* Perform the low-level PMB master operation, shared between reads and 31 * writes. 32 */ 33 static inline int __bpcm_do_op(void __iomem *master, unsigned int addr, 34 u32 off, u32 op) 35 { 36 unsigned int timeout = 1000; 37 u32 cmd; 38 39 cmd = (PMC_PMBM_START | op | (addr & 0xff) << 12 | off); 40 writel(cmd, master + PMB_CTRL); 41 do { 42 cmd = readl(master + PMB_CTRL); 43 if (!(cmd & PMC_PMBM_START)) 44 return 0; 45 46 if (cmd & PMC_PMBM_SLAVE_ERR) 47 return -EIO; 48 49 if (cmd & PMC_PMBM_TIMEOUT) 50 return -ETIMEDOUT; 51 52 udelay(1); 53 } while (timeout-- > 0); 54 55 return -ETIMEDOUT; 56 } 57 58 static inline int bpcm_rd(void __iomem *master, unsigned int addr, 59 u32 off, u32 *val) 60 { 61 int ret = 0; 62 63 ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_READ); 64 *val = readl(master + PMB_RD_DATA); 65 66 return ret; 67 } 68 69 static inline int bpcm_wr(void __iomem *master, unsigned int addr, 70 u32 off, u32 val) 71 { 72 int ret = 0; 73 74 writel(val, master + PMB_WR_DATA); 75 ret = __bpcm_do_op(master, addr, off >> 2, PMC_PMBM_WRITE); 76 77 return ret; 78 } 79 80 #endif /* __BCM63XX_PMB_H */ 81