78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
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* SCOM backend for WSP
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*
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* Copyright 2010 Benjamin Herrenschmidt, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/cpumask.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <asm/cputhreads.h>
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#include <asm/reg_a2.h>
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#include <asm/scom.h>
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#include <asm/udbg.h>
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#include "wsp.h"
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static scom_map_t wsp_scom_map(struct device_node *dev, u64 reg, u64 count)
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{
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struct resource r;
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u64 xscom_addr;
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if (!of_get_property(dev, "scom-controller", NULL)) {
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pr_err("%s: device %s is not a SCOM controller\n",
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__func__, dev->full_name);
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return SCOM_MAP_INVALID;
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}
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if (of_address_to_resource(dev, 0, &r)) {
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pr_debug("Failed to find SCOM controller address\n");
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return 0;
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}
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/* Transform the SCOM address into an XSCOM offset */
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xscom_addr = ((reg & 0x7f000000) >> 1) | ((reg & 0xfffff) << 3);
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return (scom_map_t)ioremap(r.start + xscom_addr, count << 3);
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}
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static void wsp_scom_unmap(scom_map_t map)
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{
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iounmap((void *)map);
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}
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static u64 wsp_scom_read(scom_map_t map, u32 reg)
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{
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u64 __iomem *addr = (u64 __iomem *)map;
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return in_be64(addr + reg);
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}
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static void wsp_scom_write(scom_map_t map, u32 reg, u64 value)
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{
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u64 __iomem *addr = (u64 __iomem *)map;
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return out_be64(addr + reg, value);
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}
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static const struct scom_controller wsp_scom_controller = {
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.map = wsp_scom_map,
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.unmap = wsp_scom_unmap,
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.read = wsp_scom_read,
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.write = wsp_scom_write
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};
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void scom_init_wsp(void)
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{
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scom_init(&wsp_scom_controller);
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}
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