Re: [RFC PATCH arm: initial TI-Nspire support]

From: Daniel Tang
Date: Sat Apr 06 2013 - 20:06:53 EST

Hi,

On 07/04/2013, at 12:24 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote:

>> arch/arm/Kconfig | 13 ++
>> arch/arm/Makefile | 3 +-
>> arch/arm/boot/dts/nspire-cx.dts | 85 +++++++++++++
>> arch/arm/boot/dts/nspire.dtsi | 154 +++++++++++++++++++++++
>> arch/arm/mach-nspire/Makefile | 3 +
>> arch/arm/mach-nspire/include/mach/debug-macro.S | 25 ++++
>> arch/arm/mach-nspire/include/mach/timex.h | 15 +++
>> arch/arm/mach-nspire/include/mach/uncompress.h | 25 ++++
>> arch/arm/mach-nspire/mmio.h | 13 ++
>> arch/arm/mach-nspire/nspire.c | 107 ++++++++++++++++
>
> A good next step before doing anything else might be to put it under
> CONFIG_ARCH_MULTIPLATFORM and remove the include/mach directory.
>
> The only requirement for that should be to move debug-macro.S to
> include/debug/nspire.S
>

Done.
>
>
>> @@ -313,7 +314,7 @@ define archhelp
>> echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
>> echo '* xipImage - XIP kernel image, if configured (arch/$(ARCH)/boot/xipImage)'
>> echo ' uImage - U-Boot wrapped zImage'
>> - echo ' bootpImage - Combined zImage and initial RAM disk'
>> + echo ' bootpImage - Combined zImage and initial RAM disk'
>> echo ' (supply initrd image via make variable INITRD=<path>)'
>> echo '* dtbs - Build device tree blobs for enabled boards'
>> echo ' install - Install uncompressed kernel'
>
> This looks like it wasn't meant to be in the patch.

It probably isn't. I think there was trailing whitespace on that and my editor happened to remove it automatically.

Should this be a separate patch to fix up formatting or should I leave it in as a drive-by fix?

>
>> + tdes: tdes@C8010000 {
>> + reg = <0xC8010000 0x1000>;
>> + };
>> +
>> + sha256: sha256@CC000000 {
>> + reg = <0xCC000000 0x1000>;
>> + };
>
> maybe rename the actual nodes to "crypto@xxxx". The device name should
> be a really generic word in general.

Done.

>
>> + uart: uart@90020000 {
>> + reg = <0x90020000 0x1000>;
>> + interrupts = <1>;
>> +
>> + clocks = <&uart_clk>;
>> + clock-names = "uart_clk";
>> + };
>
> The name for a uart should be "serial". Since this is a pl01x, please add
> the required properties for the device, e.g.
>
> compatible = "arm,pl011", "arm,primecell";
>
> You will need the "arm,primecell" bit to make the device appear on the
> amba bus rather than the platform bus.

That was actually deliberate because different models of the TI-NSPIRE have different serial hardware. On the newer CX models, it is a PL01x and on the older models, it has a 8250-like interface. They all reside at the same address with the same IRQ though.

I thought it might be cleaner to specify the interrupts and registers in the common file and leave it to the board specific ones to implement the "compatible" property.

>
>> + timer0: timer0@900C0000 {
>> + reg = <0x900C0000 0x1000>;
>> + interrupts = <18>;
>> +
>> + clocks = <&timer_clk>;
>> + clock-names = "timer_clk";
>> + };
>> +
>> + timer1: timer1@900D0000 {
>> + reg = <0x900D0000 0x1000>;
>> + interrupts = <19>;
>> +
>> + clocks = <&timer_clk>;
>> + clock-names = "timer_clk";
>> + };
>
> Name the devices "timer", not "timer0" and "timer1", the address after @ is
> used to disambiguate them. There are currently patches for sp804 under
> discussion on the mailing list, you should probably watch those.
>

Done. Yep, I also noticed there were patches to have device tree bindings for SP804. I'll integrate them once they're in mainline.

>> --- /dev/null
>> +++ b/arch/arm/mach-nspire/Makefile
>> @@ -0,0 +1,3 @@
>> +obj-y :=
>> +
>> +obj-y += nspire.o
>
> The first line is not actually needed.

Done.

>
>> +
>> +#include "../../mmio.h"
>> +
>> +.macro addruart, rp, rv, tmp
>> + ldr \rp, =(NSPIRE_EARLY_UART_PHYS_BASE) @ physical base address
>> + ldr \rv, =(NSPIRE_EARLY_UART_VIRT_BASE) @ virtual base address
>> +.endm
>> +
>> +#include <asm/hardware/debug-pl01x.S>
>> +
>
> There is no nice solution for getting the addresses here, but the consensus
> was to just define the macros in this file rather than try to include a
> header from elsewhere.
>

Fair enough, I've added the macros in.

>
>> + err = of_property_read_string(of_aliases, "timer0", &path);
>> + if (WARN_ON(err))
>> + return;
>> +
>> + timer = of_find_node_by_path(path);
>> + base = of_iomap(timer, 0);
>> + if (WARN_ON(!base))
>> + return;
>> +
>> + clk = of_clk_get_by_name(timer, NULL);
>> + clk_register_clkdev(clk, timer->name, "sp804");
>> +
>> + sp804_clocksource_init(base, timer->name);
>> +
>> + err = of_property_read_string(of_aliases, "timer1", &path);
>> + if (WARN_ON(err))
>> + return;
>
> In particular, I think the method of using aliases to pick the right sp804
> instance is being deprecated now. If both timers are identical, the kernel
> will now just pick one of them.

Sorry, I don't quite understand.

Out of the timers, I want to add one as a clocksource and one as a clockevent. If they're identical (i.e. without using aliases), how should I tell the kernel, "Take the first timer you see and make it a clocksource, take the next one you see and make it a clockevent"?

>
> Arnd

Here's an updated patch:

Signed-off-by: Daniel Tang <dt.tangr@xxxxxxxxx>
---
arch/arm/Kconfig | 2 +
arch/arm/Kconfig.debug | 16 ++++
arch/arm/Makefile | 3 +-
arch/arm/boot/dts/nspire-cx.dts | 85 ++++++++++++++++++++
arch/arm/boot/dts/nspire.dtsi | 154 +++++++++++++++++++++++++++++++++++++
arch/arm/include/debug/nspire.S | 28 +++++++
arch/arm/mach-nspire/Kconfig | 12 +++
arch/arm/mach-nspire/Makefile | 1 +
arch/arm/mach-nspire/Makefile.boot | 0
arch/arm/mach-nspire/mmio.h | 13 ++++
arch/arm/mach-nspire/nspire.c | 107 ++++++++++++++++++++++++++
11 files changed, 420 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/boot/dts/nspire-cx.dts
create mode 100644 arch/arm/boot/dts/nspire.dtsi
create mode 100644 arch/arm/include/debug/nspire.S
create mode 100644 arch/arm/mach-nspire/Kconfig
create mode 100644 arch/arm/mach-nspire/Makefile
create mode 100644 arch/arm/mach-nspire/Makefile.boot
create mode 100644 arch/arm/mach-nspire/mmio.h
create mode 100644 arch/arm/mach-nspire/nspire.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1cacda4..3f0cd8c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1081,6 +1081,8 @@ source "arch/arm/mach-netx/Kconfig"

source "arch/arm/mach-nomadik/Kconfig"

+source "arch/arm/mach-nspire/Kconfig"
+
source "arch/arm/plat-omap/Kconfig"

source "arch/arm/mach-omap1/Kconfig"
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 9b31f43..5da3a50 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -298,6 +298,20 @@ choice
Say Y here if you want kernel low-level debugging support
on MVEBU based platforms.

+ config DEBUG_NSPIRE_CLASSIC_UART
+ bool "Kernel low-level debugging via TI-NSPIRE 8250 UART"
+ depends on ARCH_NSPIRE
+ help
+ Say Y here if you want kernel low-level debugging support
+ on TI-NSPIRE classic models.
+
+ config DEBUG_NSPIRE_CX_UART
+ bool "Kernel low-level debugging via TI-NSPIRE PL011 UART"
+ depends on ARCH_NSPIRE
+ help
+ Say Y here if you want kernel low-level debugging support
+ on TI-NSPIRE CX models.
+
config DEBUG_OMAP2PLUS_UART
bool "Kernel low-level debugging messages via OMAP2PLUS UART"
depends on ARCH_OMAP2PLUS
@@ -591,6 +605,8 @@ config DEBUG_LL_INCLUDE
DEBUG_IMX6Q_UART
default "debug/highbank.S" if DEBUG_HIGHBANK_UART
default "debug/mvebu.S" if DEBUG_MVEBU_UART
+ default "debug/nspire.S" if DEBUG_NSPIRE_CX_UART || \
+ DEBUG_NSPIRE_CLASSIC_UART
default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index ee4605f..f47a8a7 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -165,6 +165,7 @@ machine-$(CONFIG_ARCH_MXS) += mxs
machine-$(CONFIG_ARCH_MVEBU) += mvebu
machine-$(CONFIG_ARCH_NETX) += netx
machine-$(CONFIG_ARCH_NOMADIK) += nomadik
+machine-$(CONFIG_ARCH_NSPIRE) += nspire
machine-$(CONFIG_ARCH_OMAP1) += omap1
machine-$(CONFIG_ARCH_OMAP2PLUS) += omap2
machine-$(CONFIG_ARCH_ORION5X) += orion5x
@@ -313,7 +314,7 @@ define archhelp
echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
echo '* xipImage - XIP kernel image, if configured (arch/$(ARCH)/boot/xipImage)'
echo ' uImage - U-Boot wrapped zImage'
- echo ' bootpImage - Combined zImage and initial RAM disk'
+ echo ' bootpImage - Combined zImage and initial RAM disk'
echo ' (supply initrd image via make variable INITRD=<path>)'
echo '* dtbs - Build device tree blobs for enabled boards'
echo ' install - Install uncompressed kernel'
diff --git a/arch/arm/boot/dts/nspire-cx.dts b/arch/arm/boot/dts/nspire-cx.dts
new file mode 100644
index 0000000..0a80488
--- /dev/null
+++ b/arch/arm/boot/dts/nspire-cx.dts
@@ -0,0 +1,85 @@
+/*
+ * linux/arch/arm/boot/nspire-cx.dts
+ *
+ * Copyright (C) 2012 Daniel Tang <tangrs@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+/dts-v1/;
+
+/include/ "nspire.dtsi"
+
+/ {
+ model = "TI-NSPIRE CX";
+ compatible = "arm,nspire-cx";
+
+ memory {
+ device_type = "memory";
+ reg = <0x10000000 0x4000000>; /* 64 MB */
+ };
+
+ aliases {
+ uart0 = &uart0;
+ timer0 = &timer0;
+ timer1 = &timer1;
+ fast_timer = &fast_timer;
+ };
+
+ uart_clk: uart_clk {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <12000000>;
+ };
+
+ /* Not really a fixed clock but we'll fix this later */
+ apb_pclk: apb_pclk {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <33000000>;
+ };
+
+ ahb {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ intc: interrupt-controller@DC000000 {
+ compatible = "arm,pl190-vic";
+ interrupt-controller;
+ reg = <0xDC000000 0x1000>;
+ #interrupt-cells = <1>;
+ };
+
+ apb@90000000 {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ i2c@90050000 {
+ compatible = "snps,designware-i2c";
+ reg = <0x90050000 0x1000>;
+ interrupts = <20>;
+ };
+
+ fast_timer: timer@90010000 {
+ compatible = "arm,sp804", "arm,primecell";
+ };
+
+ uart0: serial@90020000 {
+ compatible = "arm,pl011", "arm,primecell";
+ };
+
+ timer0: timer@900C0000 {
+ compatible = "arm,sp804", "arm,primecell";
+ };
+
+ timer1: timer@900D0000 {
+ compatible = "arm,sp804", "arm,primecell";
+ };
+ };
+ };
+ chosen {
+ bootargs = "debug earlyprintk console=ttyAMA0,115200n8";
+ };
+};
diff --git a/arch/arm/boot/dts/nspire.dtsi b/arch/arm/boot/dts/nspire.dtsi
new file mode 100644
index 0000000..7e9681f
--- /dev/null
+++ b/arch/arm/boot/dts/nspire.dtsi
@@ -0,0 +1,154 @@
+/*
+ * linux/arch/arm/boot/nspire.dtsi
+ *
+ * Copyright (C) 2012 Daniel Tang <tangrs@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+
+/include/ "skeleton.dtsi"
+
+/ {
+ cpus {
+ cpu@0 {
+ compatible = "arm,arm926";
+ };
+ };
+
+ bootrom: bootrom@00000000 {
+ reg = <0x00000000 0x80000>;
+ };
+
+ sram: sram@A4000000 {
+ device = "memory";
+ reg = <0xA4000000 0x20000>;
+ };
+
+ timer_clk: timer_clk {
+ #clock-cells = <0>;
+ compatible = "fixed-clock";
+ clock-frequency = <32768>;
+ };
+
+ ahb {
+ compatible = "arm,amba-bus", "simple-bus";
+ interrupt-parent = <&intc>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ spi: spi@A9000000 {
+ reg = <0xA9000000 0x1000>;
+ };
+
+ usb0: usb@B0000000 {
+ reg = <0xB0000000 0x1000>;
+ interrupts = <8>;
+ };
+
+ usb1: usb@B4000000 {
+ reg = <0xB4000000 0x1000>;
+ interrupts = <9>;
+ status = "disabled";
+ };
+
+ lcd: lcd@C0000000 {
+ compatible = "arm,amba-primecell";
+ reg = <0xC0000000 0x1000>;
+ interrupts = <21>;
+ };
+
+ adc: adc@C4000000 {
+ reg = <0xC4000000 0x1000>;
+ interrupts = <11>;
+ };
+
+ tdes: crypto@C8010000 {
+ reg = <0xC8010000 0x1000>;
+ };
+
+ sha256: crypto@CC000000 {
+ reg = <0xCC000000 0x1000>;
+ };
+
+ apb@90000000 {
+ compatible = "arm,amba-bus", "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ clocks = <&apb_pclk>;
+ clock-names = "apb_pclk";
+ clock-ranges;
+ ranges;
+
+ gpio: gpio@90000000 {
+ reg = <0x90000000 0x1000>;
+ interrupts = <7>;
+ };
+
+ fast_timer: timer@90010000 {
+ reg = <0x90010000 0x1000>;
+ interrupts = <17>;
+ };
+
+ uart: serial@90020000 {
+ reg = <0x90020000 0x1000>;
+ interrupts = <1>;
+
+ clocks = <&uart_clk>;
+ clock-names = "uart_clk";
+ };
+
+ timer0: timer@900C0000 {
+ reg = <0x900C0000 0x1000>;
+ interrupts = <18>;
+
+ clocks = <&timer_clk>;
+ clock-names = "timer_clk";
+ };
+
+ timer1: timer@900D0000 {
+ reg = <0x900D0000 0x1000>;
+ interrupts = <19>;
+
+ clocks = <&timer_clk>;
+ clock-names = "timer_clk";
+ };
+
+ watchdog: watchdog@90060000 {
+ compatible = "arm,amba-primecell";
+ reg = <0x90060000 0x1000>;
+ interrupts = <3>;
+ };
+
+ rtc: rtc@90090000 {
+ reg = <0x90090000 0x1000>;
+ interrupts = <4>;
+ };
+
+ misc: misc@900A0000 {
+ reg = <0x900A0000 0x1000>;
+ };
+
+ pwr: pwr@900B0000 {
+ reg = <0x900B0000 0x1000>;
+ interrupts = <15>;
+ };
+
+ keypad: input@900E0000 {
+ reg = <0x900E0000 0x1000>;
+ interrupts = <16>;
+ };
+
+ contrast: contrast@900F0000 {
+ reg = <0x900F0000 0x1000>;
+ };
+
+ led: led@90110000 {
+ reg = <0x90110000 0x1000>;
+ };
+ };
+ };
+};
diff --git a/arch/arm/include/debug/nspire.S b/arch/arm/include/debug/nspire.S
new file mode 100644
index 0000000..3a9729c
--- /dev/null
+++ b/arch/arm/include/debug/nspire.S
@@ -0,0 +1,28 @@
+/*
+ * linux/arch/arm/include/debug/nspire.S
+ *
+ * Copyright (C) 2012 Daniel Tang <tangrs@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#define NSPIRE_EARLY_UART_PHYS_BASE 0x90020000
+#define NSPIRE_EARLY_UART_VIRT_BASE 0xfee20000
+
+.macro addruart, rp, rv, tmp
+ ldr \rp, =(NSPIRE_EARLY_UART_PHYS_BASE) @ physical base address
+ ldr \rv, =(NSPIRE_EARLY_UART_VIRT_BASE) @ virtual base address
+.endm
+
+
+#ifdef CONFIG_DEBUG_NSPIRE_CX_UART
+#include <asm/hardware/debug-pl01x.S>
+#endif
+
+#ifdef CONFIG_DEBUG_NSPIRE_CLASSIC_UART
+#define UART_SHIFT 2
+#include <asm/hardware/debug-8250.S>
+#endif
diff --git a/arch/arm/mach-nspire/Kconfig b/arch/arm/mach-nspire/Kconfig
new file mode 100644
index 0000000..b6bf06c
--- /dev/null
+++ b/arch/arm/mach-nspire/Kconfig
@@ -0,0 +1,12 @@
+config ARCH_NSPIRE
+ bool "TI-NSPIRE based"
+ depends on MMU
+ select CPU_ARM926T
+ select COMMON_CLK
+ select GENERIC_CLOCKEVENTS
+ select SPARSE_IRQ
+ select ARM_AMBA
+ select ARM_VIC
+ select ARM_TIMER_SP804
+ help
+ This enables support for systems using the TI-NSPIRE CPU
diff --git a/arch/arm/mach-nspire/Makefile b/arch/arm/mach-nspire/Makefile
new file mode 100644
index 0000000..c96c2c4
--- /dev/null
+++ b/arch/arm/mach-nspire/Makefile
@@ -0,0 +1 @@
+obj-y += nspire.o
diff --git a/arch/arm/mach-nspire/Makefile.boot b/arch/arm/mach-nspire/Makefile.boot
new file mode 100644
index 0000000..e69de29
diff --git a/arch/arm/mach-nspire/mmio.h b/arch/arm/mach-nspire/mmio.h
new file mode 100644
index 0000000..6e2fe95
--- /dev/null
+++ b/arch/arm/mach-nspire/mmio.h
@@ -0,0 +1,13 @@
+/*
+ * linux/arch/arm/mach-nspire/mmio.h
+ *
+ * Copyright (C) 2012 Daniel Tang <tangrs@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#define NSPIRE_EARLY_UART_PHYS_BASE 0x90020000
+#define NSPIRE_EARLY_UART_VIRT_BASE 0xfee20000
diff --git a/arch/arm/mach-nspire/nspire.c b/arch/arm/mach-nspire/nspire.c
new file mode 100644
index 0000000..ec7734a
--- /dev/null
+++ b/arch/arm/mach-nspire/nspire.c
@@ -0,0 +1,107 @@
+/*
+ * linux/arch/arm/mach-nspire/nspire.c
+ *
+ * Copyright (C) 2012 Daniel Tang <tangrs@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/init.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/arm-vic.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach-types.h>
+#include <asm/mach/map.h>
+
+#include <asm/hardware/timer-sp.h>
+
+#include "mmio.h"
+
+static const char *nspire_dt_match[] __initconst = {
+ "arm,nspire",
+ "arm,nspire-cx",
+ "arm,nspire-tp",
+ "arm,nspire-clp",
+ NULL,
+};
+
+static struct map_desc nspire_io_desc[] __initdata = {
+ {
+ .virtual = NSPIRE_EARLY_UART_VIRT_BASE,
+ .pfn = __phys_to_pfn(NSPIRE_EARLY_UART_PHYS_BASE),
+ .length = SZ_4K,
+ .type = MT_DEVICE
+ }
+};
+
+static void __init nspire_init_timer(void)
+{
+ struct device_node *timer;
+ void __iomem *base;
+ const char *path;
+ struct clk *clk;
+ int irq, err;
+
+ of_clk_init(NULL);
+
+ err = of_property_read_string(of_aliases, "timer0", &path);
+ if (WARN_ON(err))
+ return;
+
+ timer = of_find_node_by_path(path);
+ base = of_iomap(timer, 0);
+ if (WARN_ON(!base))
+ return;
+
+ clk = of_clk_get_by_name(timer, NULL);
+ clk_register_clkdev(clk, timer->name, "sp804");
+
+ sp804_clocksource_init(base, timer->name);
+
+ err = of_property_read_string(of_aliases, "timer1", &path);
+ if (WARN_ON(err))
+ return;
+
+ timer = of_find_node_by_path(path);
+ base = of_iomap(timer, 0);
+ if (WARN_ON(!base))
+ return;
+
+ clk = of_clk_get_by_name(timer, NULL);
+ clk_register_clkdev(clk, timer->name, "sp804");
+
+ irq = irq_of_parse_and_map(timer, 0);
+ sp804_clockevents_init(base, irq, timer->name);
+}
+
+static void __init nspire_map_io(void)
+{
+ iotable_init(nspire_io_desc, ARRAY_SIZE(nspire_io_desc));
+}
+
+static void __init nspire_init(void)
+{
+ of_platform_populate(NULL, of_default_bus_match_table,
+ NULL, NULL);
+}
+
+static void nspire_restart(char mode, const char *cmd)
+{
+}
+
+DT_MACHINE_START(NSPIRE, "TI-NSPIRE")
+ .map_io = nspire_map_io,
+ .init_irq = irqchip_init,
+ .init_time = nspire_init_timer,
+ .init_machine = nspire_init,
+ .dt_compat = nspire_dt_match,
+ .restart = nspire_restart,
+MACHINE_END
--
1.8.1.3
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