openwrt-archive/target/linux/oxnas/files/arch/arm/mach-oxnas/mach-ox820.c

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/of_platform.h>
#include <linux/clocksource.h>
#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/gfp.h>
#include <linux/reset.h>
#include <linux/version.h>
#include <asm/mach-types.h>
#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/page.h>
#include <mach/iomap.h>
#include <mach/hardware.h>
#include <mach/utils.h>
#include <mach/smp.h>

static struct map_desc ox820_io_desc[] __initdata = {
	{
		.virtual = (unsigned long)OXNAS_PERCPU_BASE_VA,
		.pfn = __phys_to_pfn(OXNAS_PERCPU_BASE),
		.length = OXNAS_PERCPU_SIZE,
		.type = MT_DEVICE,
	},
	{
		.virtual = (unsigned long)OXNAS_SYSCRTL_BASE_VA,
		.pfn = __phys_to_pfn(OXNAS_SYSCRTL_BASE),
		.length = OXNAS_SYSCRTL_SIZE,
		.type = MT_DEVICE,
	},
	{
		.virtual = (unsigned long)OXNAS_SECCRTL_BASE_VA,
		.pfn = __phys_to_pfn(OXNAS_SECCRTL_BASE),
		.length = OXNAS_SECCRTL_SIZE,
		.type = MT_DEVICE,
	},
	{
		.virtual = (unsigned long)OXNAS_RPSA_BASE_VA,
		.pfn = __phys_to_pfn(OXNAS_RPSA_BASE),
		.length = OXNAS_RPSA_SIZE,
		.type = MT_DEVICE,
	},
	{
		.virtual = (unsigned long)OXNAS_RPSC_BASE_VA,
		.pfn = __phys_to_pfn(OXNAS_RPSC_BASE),
		.length = OXNAS_RPSC_SIZE,
		.type = MT_DEVICE,
	},
};

void __init ox820_map_common_io(void)
{
	debug_ll_io_init();
	iotable_init(ox820_io_desc, ARRAY_SIZE(ox820_io_desc));
}

static void __init ox820_dt_init(void)
{
	int ret;

	ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,
					NULL);

	if (ret) {
		pr_err("of_platform_populate failed: %d\n", ret);
		BUG();
	}

}

static void __init ox820_timer_init(void)
{
	of_clk_init(NULL);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,3,0)
	clocksource_of_init();
#else
	clocksource_probe();
#endif
}

void ox820_init_early(void)
{

}

void ox820_assert_system_reset(enum reboot_mode mode, const char *cmd)
{
	u32 value;

/* Assert reset to cores as per power on defaults
 * Don't touch the DDR interface as things will come to an impromptu stop
 * NB Possibly should be asserting reset for PLLB, but there are timing
 *    concerns here according to the docs */
	value = BIT(SYS_CTRL_RST_COPRO)		|
		BIT(SYS_CTRL_RST_USBHS)		|
		BIT(SYS_CTRL_RST_USBHSPHYA)	|
		BIT(SYS_CTRL_RST_MACA)		|
		BIT(SYS_CTRL_RST_PCIEA)		|
		BIT(SYS_CTRL_RST_SGDMA)		|
		BIT(SYS_CTRL_RST_CIPHER)	|
		BIT(SYS_CTRL_RST_SATA)		|
		BIT(SYS_CTRL_RST_SATA_LINK)	|
		BIT(SYS_CTRL_RST_SATA_PHY)	|
		BIT(SYS_CTRL_RST_PCIEPHY)	|
		BIT(SYS_CTRL_RST_STATIC)	|
		BIT(SYS_CTRL_RST_UART1)		|
		BIT(SYS_CTRL_RST_UART2)		|
		BIT(SYS_CTRL_RST_MISC)		|
		BIT(SYS_CTRL_RST_I2S)		|
		BIT(SYS_CTRL_RST_SD)		|
		BIT(SYS_CTRL_RST_MACB)		|
		BIT(SYS_CTRL_RST_PCIEB)		|
		BIT(SYS_CTRL_RST_VIDEO)		|
		BIT(SYS_CTRL_RST_USBHSPHYB)	|
		BIT(SYS_CTRL_RST_USBDEV);

	writel(value, SYS_CTRL_RST_SET_CTRL);

	/* Release reset to cores as per power on defaults */
	writel(BIT(SYS_CTRL_RST_GPIO), SYS_CTRL_RST_CLR_CTRL);

	/* Disable clocks to cores as per power-on defaults - must leave DDR
	 * related clocks enabled otherwise we'll stop rather abruptly. */
	value =
		BIT(SYS_CTRL_CLK_COPRO)		|
		BIT(SYS_CTRL_CLK_DMA)		|
		BIT(SYS_CTRL_CLK_CIPHER)	|
		BIT(SYS_CTRL_CLK_SD)		|
		BIT(SYS_CTRL_CLK_SATA)		|
		BIT(SYS_CTRL_CLK_I2S)		|
		BIT(SYS_CTRL_CLK_USBHS)		|
		BIT(SYS_CTRL_CLK_MAC)		|
		BIT(SYS_CTRL_CLK_PCIEA)		|
		BIT(SYS_CTRL_CLK_STATIC)	|
		BIT(SYS_CTRL_CLK_MACB)		|
		BIT(SYS_CTRL_CLK_PCIEB)		|
		BIT(SYS_CTRL_CLK_REF600)	|
		BIT(SYS_CTRL_CLK_USBDEV);

	writel(value, SYS_CTRL_CLK_CLR_CTRL);

	/* Enable clocks to cores as per power-on defaults */

	/* Set sys-control pin mux'ing as per power-on defaults */
	writel(0, SYS_CTRL_SECONDARY_SEL);
	writel(0, SYS_CTRL_TERTIARY_SEL);
	writel(0, SYS_CTRL_QUATERNARY_SEL);
	writel(0, SYS_CTRL_DEBUG_SEL);
	writel(0, SYS_CTRL_ALTERNATIVE_SEL);
	writel(0, SYS_CTRL_PULLUP_SEL);

	writel(0, SEC_CTRL_SECONDARY_SEL);
	writel(0, SEC_CTRL_TERTIARY_SEL);
	writel(0, SEC_CTRL_QUATERNARY_SEL);
	writel(0, SEC_CTRL_DEBUG_SEL);
	writel(0, SEC_CTRL_ALTERNATIVE_SEL);
	writel(0, SEC_CTRL_PULLUP_SEL);

	/* No need to save any state, as the ROM loader can determine whether
	 * reset is due to power cycling or programatic action, just hit the
	 * (self-clearing) CPU reset bit of the block reset register */
	value =
		BIT(SYS_CTRL_RST_SCU) |
		BIT(SYS_CTRL_RST_ARM0) |
		BIT(SYS_CTRL_RST_ARM1);

	writel(value, SYS_CTRL_RST_SET_CTRL);
}

static const char * const ox820_dt_board_compat[] = {
	"plxtech,nas7820",
	"plxtech,nas7821",
	"plxtech,nas7825",
	NULL
};

DT_MACHINE_START(OX820_DT, "PLXTECH NAS782X SoC (Flattened Device Tree)")
	.map_io		= ox820_map_common_io,
	.smp		= smp_ops(ox820_smp_ops),
	.init_early	= ox820_init_early,
	.init_time	= ox820_timer_init,
	.init_machine	= ox820_dt_init,
	.restart	= ox820_assert_system_reset,
	.dt_compat	= ox820_dt_board_compat,
MACHINE_END