| Florian Fainelli | 6e844b0 | 2015-04-17 10:45:55 -0700 | [diff] [blame] | 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 */ |