12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788 |
- /*
- * Broadcom BCM63xx Processor Monitor Bus shared routines (SMP and reset)
- *
- * Copyright (C) 2015, Broadcom Corporation
- * Author: Florian Fainelli <f.fainelli@gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #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 */
|