[PATCH 16/19] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC
Chanwoo Choi
cw00.choi at samsung.com
Sun Nov 30 18:21:46 PST 2014
Dear Mark,
On 11/28/2014 11:00 PM, Mark Rutland wrote:
> On Fri, Nov 28, 2014 at 01:18:25PM +0000, Chanwoo Choi wrote:
>> Dear Mark,
>>
>> On 11/27/2014 08:18 PM, Mark Rutland wrote:
>>> On Thu, Nov 27, 2014 at 07:35:13AM +0000, Chanwoo Choi wrote:
>>>> This patch adds new Exynos5433 dtsi to support 64-bit Exynos5433 SoC
>>>> based on Octal core CPUs (quad Cortex-A57 and quad Cortex-A53).
>>>>
>>>> Cc: Kukjin Kim <kgene.kim at samsung.com>
>>>> Cc: Mark Rutland <mark.rutland at arm.com>
>>>> Cc: Arnd Bergmann <arnd at arndb.de>
>>>> Cc: Olof Johansson <olof at lixom.net>
>>>> Cc: Catalin Marinas <catalin.marinas at arm.com>
>>>> Cc: Will Deacon <will.deacon at arm.com>
>>>> Signed-off-by: Chanwoo Choi <cw00.choi at samsung.com>
>>>> Acked-by: Inki Dae <inki.dae at samsung.com>
>>>> Acked-by: Geunsik Lim <geunsik.lim at samsung.com>
>>>> ---
>>>> arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi | 698 +++++++++++++++++++++
>>>> arch/arm64/boot/dts/exynos/exynos5433.dtsi | 523 +++++++++++++++
>>>> 2 files changed, 1221 insertions(+)
>>>> create mode 100644 arch/arm64/boot/dts/exynos/exynos5433-pinctrl.dtsi
>>>> create mode 100644 arch/arm64/boot/dts/exynos/exynos5433.dtsi
>>>
>
> [...]
>
>>>> + cpus {
>>>> + #address-cells = <2>;
>>>> + #size-cells = <0>;
>>>> +
>>>> + cpu0: cpu at 100 {
>>>> + device_type = "cpu";
>>>> + compatible = "arm,cortex-a53", "arm,armv8";
>>>> + enable-method = "psci";
>>>
>>> While the CPU nodes have enable-methods, I didn't spot a PSCI node
>>> anywhere, so this dts cannot possibly have been used to bring up an SMP
>>> system.
>>>
>>> How has this dts been tested?
>>>
>>> What PSCI revision have you implemented? Have have you tested it?
>>
>> My mistake,
>> Exynos5433 supports PSCI v0.1. I'll add following PSCI nodes:
>> I tested the boot of secondary cpu.
>>
>> psci {
>> compatible = "arm,psci";
>> method = "smc";
>> cpu_off = <0x84000002>;
>> cpu_on = <0xC4000003>;
>> };
>
> Ok. I take it _any_ CPU may be hotplugged (including CPU0), given that
> you don't have MIGRATE_INFO_TYPE from PSCI 0.2 to tell you that this is
> not possible? If not, attempting to hotplug CPU0 will result in a BUG()
> and the kernel will explode.
>
> Has that been tested?
I just tested secondary CPU on during kernel booting after added 'psci' dt node.
So, I got the ON state of Octa CPUs.
Maybe I need more time to implement CPU0 and secondary cpu hotplugged dynamically on runtime.
>
> Do all CPUs enter the kernel at EL2?
I didn't consider EL2 for hypervisor mode.
First role of this job, I'll implement CPU on/off and suspend by using PSCI.
>
>>>> + soc: soc {
>>>> + compatible = "simple-bus";
>>>> + #address-cells = <1>;
>>>> + #size-cells = <1>;
>>>> + ranges;
>>>> +
>>>> + fixed-rate-clocks {
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> +
>>>> + xusbxti: clock at 0 {
>>>> + compatible = "fixed-clock";
>>>> + clock-output-names = "xusbxti";
>>>> + #clock-cells = <0>;
>>>> + };
>>>> + };
>>>
>>> Get rid of the fixed-rate-clocks container node. It's pointless and
>>> messy. Given you only have one there's no need for the bogus
>>> unit-address either.
>>
>> OK, I'll remove unneeded code and will add following dt node for fin_pll.
>>
>> fin_pll: xxti {
>> compatible = "fixed-clock";
>> clock-output-names = "fin_pll";
>> #clock-cells = <0>;
>> };
>
> That looks fine to me.
>
> [...]
>
>>>> + mct at 101c0000 {
>>>> + compatible = "samsung,exynos4210-mct";
>>>> + reg = <0x101c0000 0x800>;
>>>> + interrupts = <0 102 0>, <0 103 0>, <0 104 0>, <0 105 0>,
>>>> + <0 106 0>, <0 107 0>, <0 108 0>, <0 109>,
>>>> + <0 110 0>, <0 111 0>, <0 112 0>, <0 113 0>;
>>>> + clocks = <&cmu_top CLK_FIN_PLL>, <&cmu_peris CLK_PCLK_MCT>;
>>>> + clock-names = "fin_pll", "mct";
>>>> + };
>>>
>>> Hase this block had no changes whatsoever since its use in Exynos4210?
>>> Do we not need a "samsung,exynos5433-mct" comaptible string too?
>>
>> The type of Exynos5433's MCT(Multi-Core Timer) IP is the same with the type of Exynos4210 MCT.
>> Just Exynos5433 have eight local timer for Octa cores.
>
> So "samsung,exynos4210-mct" should appear in the list. I'm just
> wondering if it's worth having:
>
> compatible = "samsung,exynos5433-mct", "samsung,exynos4210-mct";
>
> Just in case we need to special-case the 5433 MCT for some reason later.
OK, I'll add "samsung,exynos5433-mct" compatible string in exynos5433.dtsi
according to your comment.
>
>>
>> CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
>> 134: 0 0 0 0 0 0 0 0 GIC 134 mct_comp_irq
>> 138: 3189 0 0 0 0 0 0 0 GIC 138 mct_tick0
>> 139: 0 2670 0 0 0 0 0 0 GIC 139 mct_tick1
>> 140: 0 0 2763 0 0 0 0 0 GIC 140 mct_tick2
>> 141: 0 0 0 2732 0 0 0 0 GIC 141 mct_tick3
>> 142: 0 0 0 0 2998 0 0 0 GIC 142 mct_tick4
>> 143: 0 0 0 0 0 2664 0 0 GIC 143 mct_tick5
>> 144: 0 0 0 0 0 0 2485 0 GIC 144 mct_tick6
>> 145: 0 0 0 0 0 0 0 2681 GIC 145 mct_tick7
>>
>> But, existing exynos-mct.c driver(drivers/clocksource/exynos-mct.c) used
>> 'register_current_timer_delay()' function which is supported on arm 32bit.
>> I fix it as following diff and then I'll send it to support 64-bit Exynos SoC on exynos-mct.c.
>>
>> drivers/clocksource/Kconfig | 1 -
>> drivers/clocksource/exynos_mct.c | 4 ++++
>> 2 files changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index 9042060..27ef3fa 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -134,7 +134,6 @@ config CLKSRC_METAG_GENERIC
>>
>> config CLKSRC_EXYNOS_MCT
>> def_bool y if ARCH_EXYNOS
>> - depends on !ARM64
>> help
>> Support for Multi Core Timer controller on Exynos SoCs.
>>
>> diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
>> index 9403061..d9c7dbb 100644
>> --- a/drivers/clocksource/exynos_mct.c
>> +++ b/drivers/clocksource/exynos_mct.c
>> @@ -223,6 +223,7 @@ static u64 notrace exynos4_read_sched_clock(void)
>> return exynos4_read_count_32();
>> }
>>
>> +#if !defined(CONFIG_ARM64)
>> static struct delay_timer exynos4_delay_timer;
>>
>> static cycles_t exynos4_read_current_timer(void)
>> @@ -231,14 +232,17 @@ static cycles_t exynos4_read_current_timer(void)
>> "cycles_t needs to move to 32-bit for ARM64 usage");
>> return exynos4_read_count_32();
>> }
>> +#endif
>>
>> static void __init exynos4_clocksource_init(void)
>> {
>> exynos4_mct_frc_start();
>>
>> +#if !defined(CONFIG_ARM64)
>> exynos4_delay_timer.read_current_timer = &exynos4_read_current_timer;
>> exynos4_delay_timer.freq = clk_rate;
>> register_current_timer_delay(&exynos4_delay_timer);
>> +#endif
>
> Why not make both of these depend on CONFIG_ARM, rather than
> !CONFIG_ARM64? We care about the presence of the delay_timer struct and
> functions, which (from grepping around) exist in arch/arm and nowhere
> else.
You're right.
I'll fix it by using CONFIG_ARM instead of !CONFIG_ARM64.
>
>>>> + gic:interrupt-controller at 11001000 {
>>>> + compatible = "arm,cortex-a15-gic";
>>>
>>> Given this is multi-cluster, surely this is an external GIC-400, for
>>> which we have a supported compatible string?
>>>
>>> So this should at least be:
>>>
>>> compatible = "arm,gic-400", "arm,cortex-a15-gic";
>>
>> Exynos5433 used GIC-400. I'll modify it as following:
>>
>> compatible = "arm,gic-400";
>
> Ok. The former variant (with "arm,cortex-a15-gic" later in the list) has
> the benefit of working with KVM today (which doesn't currently look for
> "arm,gic-400").
>
>>>> + #interrupt-cells = <3>;
>>>> + interrupt-controller;
>>>> + reg = <0x11001000 0x1000>,
>>>> + <0x11002000 0x1000>,
>>>> + <0x11004000 0x2000>,
>>>> + <0x11006000 0x2000>;
>>>
>>> As far as I am aware, the GICC size is 8KiB. Regardless of whether we
>>> currently use the second page of registers, they should be described.
>>
>> The GICC (CPU Interface Register) register of Exynos5433 is range of 0x1100_2000 ~ 0x1100_2100.
>
> That does not sound right. Per the GICv2 architecture, GICC is at least
> 0x1004 bytes long (as GICC_DIR lives at offset 0x1000).
You're right. I replied it on below .
>
>> But, I'll modify GICC size from 4KiB to 8KiB as following according to your comment:
>> <0x11002000 0x1000> -> <0x11002000 0x2000>
>
> To clarify: is GICC_DIR accessible in Exynos5433 systems, or is
> everything past offset 0x100 not physically mapped?
>
I checked the base address of GICC_DIR on Exynos3250/Exynos5433/Exynos7 using gic-400.
GICC_DIR is 1048_3000 on Exynos3250.
GICC_DIR is 1100_2100 on Exynos5433.
GICC_DIR is 1100_2100 on Exynos7.
I think that TRM includes incorrect base address of GICC_DIR on Exynos5433/Exynos7.
GICC_DIR of Exynos3250 is GICC_DIR is 1048_2000 + 0x1000 offset as you commented.
Thanks for your review.
Best Regards,
Chanwoo Choi
>>>> + interrupts = <1 9 0xf04>;
>>>> + };
>>>> +
>>>> + serial_0: serial at 14C10000 {
>>>
>>> Nit: Please be consistent with capitalisation of hex. IMO it's better
>>> to leave it all lower-case.
>>
>> I'll use the lower-case for all base address.
>
> Thanks.
>
>>
>>>
>>> [...]
>>>
>>>> + timer {
>>>> + compatible = "arm,armv8-timer";
>>>> + interrupts = <1 13 0xff01>,
>>>> + <1 14 0xff01>,
>>>> + <1 11 0xff01>,
>>>> + <1 10 0xff01>;
>>>> + clock-frequency = <24000000>;
>>>> + use-clocksource-only;
>>>> + use-physical-timer;
>>>
>>> As Marc said, NAK for these last three properties.
>>>
>>> There is no excuse for not setting CNTFRQ_EL0, especially given a PSCI
>>> implementation. The last two properties have never been supported in
>>> mainline, and shouldn't be necessary regardless.
>>
>> OK, I'll remove last three properties.
>
> Thanks.
>
> Mark.
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