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 */ 41 static 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 66 static 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 77 static 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