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/*
* xen/arch/arm/platforms/sunxi.c
*
* SUNXI (Allwinner ARM SoCs) specific settings
*
* Copyright (c) 2013 Citrix Systems.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <xen/mm.h>
#include <xen/vmap.h>
#include <asm/platform.h>
#include <asm/io.h>
/* Watchdog constants: */
#define SUNXI_WDT_MODE_REG 0x04
#define SUNXI_WDT_MODE_EN (1 << 0)
#define SUNXI_WDT_MODE_RST_EN (1 << 1)
#define SUNXI_WDT_CONFIG_SYSTEM_RESET (1 << 0)
#define SUNXI_WDOG0_CFG_REG 0x14
#define SUNXI_WDOG0_MODE_REG 0x18
static void __iomem *sunxi_map_watchdog(bool *new_wdt)
{
void __iomem *wdt;
struct dt_device_node *node;
paddr_t wdt_start, wdt_len;
bool _new_wdt = false;
int ret;
node = dt_find_compatible_node(NULL, NULL, "allwinner,sun6i-a31-wdt");
if ( node )
_new_wdt = true;
else
node = dt_find_compatible_node(NULL, NULL, "allwinner,sun4i-a10-wdt");
if ( !node )
{
dprintk(XENLOG_ERR, "Cannot find matching watchdog node in DT\n");
return NULL;
}
ret = dt_device_get_address(node, 0, &wdt_start, &wdt_len);
if ( ret )
{
dprintk(XENLOG_ERR, "Cannot read watchdog register address\n");
return NULL;
}
wdt = ioremap_nocache(wdt_start & PAGE_MASK, PAGE_SIZE);
if ( !wdt )
{
dprintk(XENLOG_ERR, "Unable to map watchdog register!\n");
return NULL;
}
if ( new_wdt )
*new_wdt = _new_wdt;
return wdt + (wdt_start & ~PAGE_MASK);
}
/* Enable watchdog to trigger a reset after 500 ms */
static void sunxi_old_wdt_reset(void __iomem *wdt)
{
writel(SUNXI_WDT_MODE_EN | SUNXI_WDT_MODE_RST_EN,
wdt + SUNXI_WDT_MODE_REG);
}
static void sunxi_new_wdt_reset(void __iomem *wdt)
{
writel(SUNXI_WDT_CONFIG_SYSTEM_RESET, wdt + SUNXI_WDOG0_CFG_REG);
writel(SUNXI_WDT_MODE_EN, wdt + SUNXI_WDOG0_MODE_REG);
}
static void sunxi_reset(void)
{
void __iomem *wdt;
bool is_new_wdt;
wdt = sunxi_map_watchdog(&is_new_wdt);
if ( !wdt )
return;
if ( is_new_wdt )
sunxi_new_wdt_reset(wdt);
else
sunxi_old_wdt_reset(wdt);
iounmap(wdt);
for (;;)
wfi();
}
static const char * const sunxi_v7_dt_compat[] __initconst =
{
"allwinner,sun6i-a31",
"allwinner,sun6i-a31s",
"allwinner,sun7i-a20",
"allwinner,sun8i-a23",
"allwinner,sun8i-a33",
"allwinner,sun8i-h2-plus",
"allwinner,sun8i-h3",
NULL
};
static const char * const sunxi_v8_dt_compat[] __initconst =
{
"allwinner,sun50i-a64",
"allwinner,sun50i-h5",
"allwinner,sun50i-h6",
NULL
};
static const struct dt_device_match sunxi_blacklist_dev[] __initconst =
{
/*
* The UARTs share a page which runs the risk of mapping the Xen console
* UART to dom0, so don't map any of them.
*/
DT_MATCH_COMPATIBLE("snps,dw-apb-uart"),
{ /* sentinel */ },
};
PLATFORM_START(sunxi_v7, "Allwinner ARMv7")
.compatible = sunxi_v7_dt_compat,
.blacklist_dev = sunxi_blacklist_dev,
.reset = sunxi_reset,
PLATFORM_END
PLATFORM_START(sunxi_v8, "Allwinner ARMv8")
.compatible = sunxi_v8_dt_compat,
.blacklist_dev = sunxi_blacklist_dev,
PLATFORM_END
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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