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https://github.com/torvalds/linux
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43880f709d
Commit 68136b10 ("ARM: sunxi: Change device tree naming scheme for
sunxi") changed the naming scheme and the compatible strings used in the
device trees related to the sunXi platform, but forgot to change the
compatible string in the DT machine definition.
This prevents the kernel from booting on these boards.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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* Device Tree support for Allwinner A1X SoCs
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*
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* Copyright (C) 2012 Maxime Ripard
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/sunxi_timer.h>
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#include <linux/irqchip/sunxi.h>
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#include <asm/hardware/vic.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "sunxi.h"
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#define WATCHDOG_CTRL_REG 0x00
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#define WATCHDOG_MODE_REG 0x04
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static void __iomem *wdt_base;
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static void sunxi_setup_restart(void)
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{
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struct device_node *np = of_find_compatible_node(NULL, NULL,
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"allwinner,sunxi-wdt");
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if (WARN(!np, "unable to setup watchdog restart"))
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return;
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wdt_base = of_iomap(np, 0);
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WARN(!wdt_base, "failed to map watchdog base address");
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}
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static void sunxi_restart(char mode, const char *cmd)
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{
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if (!wdt_base)
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return;
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/* Enable timer and set reset bit in the watchdog */
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writel(3, wdt_base + WATCHDOG_MODE_REG);
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writel(0xa57 << 1 | 1, wdt_base + WATCHDOG_CTRL_REG);
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while(1) {
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mdelay(5);
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writel(3, wdt_base + WATCHDOG_MODE_REG);
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}
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}
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static struct map_desc sunxi_io_desc[] __initdata = {
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{
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.virtual = (unsigned long) SUNXI_REGS_VIRT_BASE,
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.pfn = __phys_to_pfn(SUNXI_REGS_PHYS_BASE),
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.length = SUNXI_REGS_SIZE,
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.type = MT_DEVICE,
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},
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};
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void __init sunxi_map_io(void)
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{
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iotable_init(sunxi_io_desc, ARRAY_SIZE(sunxi_io_desc));
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}
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static void __init sunxi_dt_init(void)
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{
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sunxi_setup_restart();
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of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
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}
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static const char * const sunxi_board_dt_compat[] = {
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"allwinner,sun4i-a10",
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"allwinner,sun5i-a13",
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NULL,
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};
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DT_MACHINE_START(SUNXI_DT, "Allwinner A1X (Device Tree)")
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.init_machine = sunxi_dt_init,
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.map_io = sunxi_map_io,
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.init_irq = sunxi_init_irq,
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.handle_irq = sunxi_handle_irq,
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.restart = sunxi_restart,
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.timer = &sunxi_timer,
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.dt_compat = sunxi_board_dt_compat,
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MACHINE_END
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