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-rw-r--r--include/linux/reset/bcm63xx_pmb.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/include/linux/reset/bcm63xx_pmb.h b/include/linux/reset/bcm63xx_pmb.h
new file mode 100644
index 000000000000..bb4af7b5eb36
--- /dev/null
+++ b/include/linux/reset/bcm63xx_pmb.h
@@ -0,0 +1,88 @@
+/*
+ * 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 */
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