On 2016年06月29日 23:19, Arnd Bergmann wrote:
On Saturday, June 25, 2016 6:37:17 PM CEST Wan Zongshun wrote:
NUC970 is a new SoC of Nuvoton nuc900 series, this patch is
to add machine file support for it.
Signed-off-by: Wan Zongshun <mcuos.com@xxxxxxxxx>
Nice to see some activity on the port!
---
arch/arm/mach-w90x900/Kconfig | 25 ++++
arch/arm/mach-w90x900/Makefile | 3 +
.../mach-w90x900/include/mach/nuc970-regs-gcr.h | 56 ++++++++
arch/arm/mach-w90x900/mach-nuc970.c | 144 +++++++++++++++++++++
4 files changed, 228 insertions(+)
create mode 100644 arch/arm/mach-w90x900/include/mach/nuc970-regs-gcr.h
create mode 100644 arch/arm/mach-w90x900/mach-nuc970.c
diff --git a/arch/arm/mach-w90x900/Kconfig b/arch/arm/mach-w90x900/Kconfig
index 69bab32..050833e 100644
--- a/arch/arm/mach-w90x900/Kconfig
+++ b/arch/arm/mach-w90x900/Kconfig
@@ -15,6 +15,21 @@ config CPU_NUC960
help
Support for NUCP960 of Nuvoton NUC900 CPUs.
+config SOC_NUC970
+ bool
+ select GENERIC_IRQ_CHIP
+ select SOC_BUS
+ select IRQ_DOMAIN
+ select MULTI_IRQ_HANDLER
+ select USE_OF
+ select HAVE_CLK_PREPARE
+ select HAVE_MACH_CLKDEV
+ select COMMON_CLK
+ select NUC900_TIMER
+ help
+ Support for NUCP970 of Nuvoton NUC900 CPUs.
+
[style] This looks whitespace damaged, and please sort the line alphabetically.
Sure, changed.
I see you have done this in a way that is basically compatible with
CONFIG_ARCH_MULTIPLATFORM, good.
What is HAVE_MACH_CLKDEV for?
@@ -46,4 +61,14 @@ config MACH_W90N960EVB
endmenu
+menu "NUC970 Machines"
+
+config MACH_NUC970EVB
+ bool "Nuvoton NUC970 Evaluation Board"
+ select SOC_NUC970
+ help
+ Say Y here if you are using the Nuvoton NUC970EVB
+
+endmenu
I'd leave out this entry, with the way have have structured the code (correctly),
there is no need to separate SoC-specific code from board specific code, since
they are the same.
Sure, removed it.
diff --git a/arch/arm/mach-w90x900/include/mach/nuc970-regs-gcr.h b/arch/arm/mach-w90x900/include/mach/nuc970-regs-gcr.h
new file mode 100644
index 0000000..e7eb653
--- /dev/null
+++ b/arch/arm/mach-w90x900/include/mach/nuc970-regs-gcr.h
Can you move the new headers to arch/arm/mach-w90x900/ directly?
+static int __init nuc900_restart_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "nuvoton,gcr");
+ wtcr_addr = of_iomap(np, 0);
+ if (!wtcr_addr)
+ return -ENODEV;
+
+ of_node_put(np);
+
+ return 0;
+}
Is this a watchdog node? If it is, the restart logic should just
move into the watchdog driver.
It is not watchdog node, just be global System control register node.
+ if (of_machine_is_compatible("nuvoton,nuc970evb"))
+ nuc970_init();
What is this for?
Currently, no used, remove it.
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
We have actually moved away from using the soc_device as using the parent
for the other devices, just probe them separately. In fact the soc_device
could be handled by a driver in drivers/soc/nuvoton/
Do you think I should add nuc900 soc driver in this folder?
If I want to add nuc900 soc driver in drivers/soc/nuvoton/, can I keep
my current dts structure no change, or Must I add a new node name soc {}?
I went through the code:soc-realview.c for reference, but I have no idea
about how to re-structure my dts file to match this type soc driver.
+static const char *nuc970_dt_compat[] __initconst = {
+ "nuvoton,nuc970evb",
+ NULL,
+};
+
+void nuc970_restart(enum reboot_mode mode, const char *cmd)
+{
+ if (wtcr_addr) {
+ while (__raw_readl(wtcr_addr + REG_WRPRTR) != 1) {
+ __raw_writel(0x59, wtcr_addr + REG_WRPRTR);
+ __raw_writel(0x16, wtcr_addr + REG_WRPRTR);
+ __raw_writel(0x88, wtcr_addr + REG_WRPRTR);
+ }
+
+ __raw_writel(1, wtcr_addr + REG_AHBIPRST);
+ }
Please use writel() instead of __raw_writel().
Does this change apply to all others drivers? or just machine file to
use writel()?
+ soft_restart(0);
+}
+
+DT_MACHINE_START(nuc970_dt, "Nuvoton nuc970 evb")
+ .atag_offset = 0x100,
Removed it, thanks!
The .atag_offset can be removed here.
Arnd
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