* [PATCH v6 0/3] Renesas R9A06G032 SMP enabler
@ 2018-06-25 8:25 Michel Pollet
2018-06-25 8:25 ` [PATCH v6 1/3] dt-bindings: cpu: Add Renesas R9A06G032 SMP enable method Michel Pollet
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Michel Pollet @ 2018-06-25 8:25 UTC (permalink / raw)
To: linux-renesas-soc, Simon Horman
Cc: phil.edworthy, Michel Pollet, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Geert Uytterhoeven,
Maxime Ripard, Chen-Yu Tsai, Florian Fainelli, Stefan Wahren,
Carlo Caione, Rajendra Nayak, devicetree, linux-kernel,
linux-arm-kernel
*WARNING -- this requires the base R9A06G032 support patches
already posted.
This patch series is for enabling the second CA7 of the R9A06G032.
It's based on a spin_table method, and it reuses the same binding
property as that driver.
v6:
+ Passed scriptcheck --strict on the driver.
+ Rebased on base patchset v10
v5:
+ Fixed a couple of typos
+ Added the Reviewed-by tags where appropriate
+ Rebased on base patch v9
+ Replaced the dts property with a 64 bits one.
+ Changed the driver to support 32 or 64 bits property.
v4:
+ Geert's comments adressed.
+ Renamed symbols to r9a06g032 to match the rest of patchset
+ Rebased on base patch v8
v3:
+ Removed mentions of rz/?n1d?
+ Rebased on base patch v7
v2:
+ Added suggestions from Florian Fainelli
+ Use __pa_symbol()
+ Simplified logic in prepare_cpu()
+ Reordered the patches
+ Rebased on RZN1 Base patch v5
Michel Pollet (3):
dt-bindings: cpu: Add Renesas R9A06G032 SMP enable method.
arm: shmobile: Add the R9A06G032 SMP enabler driver
ARM: dts: Renesas R9A06G032 SMP enable method
Documentation/devicetree/bindings/arm/cpus.txt | 1 +
arch/arm/boot/dts/r9a06g032.dtsi | 2 +
arch/arm/mach-shmobile/Makefile | 1 +
arch/arm/mach-shmobile/smp-r9a06g032.c | 96 ++++++++++++++++++++++++++
4 files changed, 100 insertions(+)
create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
--
2.7.4
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH v6 1/3] dt-bindings: cpu: Add Renesas R9A06G032 SMP enable method.
2018-06-25 8:25 [PATCH v6 0/3] Renesas R9A06G032 SMP enabler Michel Pollet
@ 2018-06-25 8:25 ` Michel Pollet
2018-06-25 8:25 ` [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver Michel Pollet
2018-06-25 8:25 ` [PATCH v6 3/3] ARM: dts: Renesas R9A06G032 SMP enable method Michel Pollet
2 siblings, 0 replies; 7+ messages in thread
From: Michel Pollet @ 2018-06-25 8:25 UTC (permalink / raw)
To: linux-renesas-soc, Simon Horman
Cc: phil.edworthy, Michel Pollet, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Andy Gross,
Douglas Anderson, Stefan Wahren, Carlo Caione, Rajendra Nayak,
Chen-Yu Tsai, Florian Fainelli, devicetree, linux-kernel,
linux-arm-kernel
Add a special enable method for second CA7 of the R9A06G032
Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
---
Documentation/devicetree/bindings/arm/cpus.txt | 1 +
1 file changed, 1 insertion(+)
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index 29e1dc5..b395d107 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt
@@ -219,6 +219,7 @@ described below.
"qcom,kpss-acc-v1"
"qcom,kpss-acc-v2"
"renesas,apmu"
+ "renesas,r9a06g032-smp"
"rockchip,rk3036-smp"
"rockchip,rk3066-smp"
"ste,dbx500-smp"
--
2.7.4
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver
2018-06-25 8:25 [PATCH v6 0/3] Renesas R9A06G032 SMP enabler Michel Pollet
2018-06-25 8:25 ` [PATCH v6 1/3] dt-bindings: cpu: Add Renesas R9A06G032 SMP enable method Michel Pollet
@ 2018-06-25 8:25 ` Michel Pollet
2018-06-25 9:24 ` Geert Uytterhoeven
2018-06-25 8:25 ` [PATCH v6 3/3] ARM: dts: Renesas R9A06G032 SMP enable method Michel Pollet
2 siblings, 1 reply; 7+ messages in thread
From: Michel Pollet @ 2018-06-25 8:25 UTC (permalink / raw)
To: linux-renesas-soc, Simon Horman
Cc: phil.edworthy, Michel Pollet, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Rajendra Nayak,
Maxime Ripard, Florian Fainelli, Andy Gross, Carlo Caione,
Stefan Wahren, Chen-Yu Tsai, devicetree, linux-kernel,
linux-arm-kernel
The Renesas R9A06G032 second CA7 is parked in a ROM pen at boot time, it
requires a special enable method to get it started.
Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
arch/arm/mach-shmobile/Makefile | 1 +
arch/arm/mach-shmobile/smp-r9a06g032.c | 96 ++++++++++++++++++++++++++++++++++
2 files changed, 97 insertions(+)
create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile
index 05ba728..d24d9c9 100644
--- a/arch/arm/mach-shmobile/Makefile
+++ b/arch/arm/mach-shmobile/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_ARCH_R8A7793) += regulator-quirk-rcar-gen2.o
smp-y := $(cpu-y)
smp-$(CONFIG_ARCH_SH73A0) += smp-sh73a0.o headsmp-scu.o platsmp-scu.o
smp-$(CONFIG_ARCH_R8A7779) += smp-r8a7779.o headsmp-scu.o platsmp-scu.o
+smp-$(CONFIG_ARCH_R9A06G032) += smp-r9a06g032.o
smp-$(CONFIG_ARCH_EMEV2) += smp-emev2.o headsmp-scu.o platsmp-scu.o
# PM objects
diff --git a/arch/arm/mach-shmobile/smp-r9a06g032.c b/arch/arm/mach-shmobile/smp-r9a06g032.c
new file mode 100644
index 0000000..a1926e8
--- /dev/null
+++ b/arch/arm/mach-shmobile/smp-r9a06g032.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R9A06G032 Second CA7 enabler.
+ *
+ * Copyright (C) 2018 Renesas Electronics Europe Limited
+ *
+ * Michel Pollet <michel.pollet@bp.renesas.com>, <buserror@gmail.com>
+ * Derived from actions,s500-smp
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/smp.h>
+
+/*
+ * The second CPU is parked in ROM at boot time. It requires waking it after
+ * writing an address into the BOOTADDR register of sysctrl.
+ *
+ * So the default value of the "cpu-release-addr" corresponds to BOOTADDR...
+ *
+ * *However* the BOOTADDR register is not available when the kernel
+ * starts in NONSEC mode.
+ *
+ * So for NONSEC mode, the bootloader re-parks the second CPU into a pen
+ * in SRAM, and changes the "cpu-release-addr" of linux's DT to a SRAM address,
+ * which is not restricted.
+ */
+
+static void __iomem *cpu_bootaddr;
+
+static DEFINE_SPINLOCK(cpu_lock);
+
+static int
+r9a06g032_smp_boot_secondary(unsigned int cpu,
+ struct task_struct *idle)
+{
+ if (!cpu_bootaddr)
+ return -ENODEV;
+
+ spin_lock(&cpu_lock);
+
+ writel(__pa_symbol(secondary_startup), cpu_bootaddr);
+ arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+ spin_unlock(&cpu_lock);
+
+ return 0;
+}
+
+static void __init r9a06g032_smp_prepare_cpus(unsigned int max_cpus)
+{
+ struct device_node *dn;
+ int ret = -EINVAL, dns;
+ u32 bootaddr;
+
+ dn = of_get_cpu_node(1, NULL);
+ if (!dn) {
+ pr_err("CPU#1: missing device tree node\n");
+ return;
+ }
+ /*
+ * Determine the address from which the CPU is polling.
+ * The bootloader *does* change this property.
+ * Note: The property can be either 64 or 32 bits, so handle both cases
+ */
+ if (of_find_property(dn, "cpu-release-addr", &dns)) {
+ if (dns == sizeof(u64)) {
+ u64 temp;
+
+ ret = of_property_read_u64(dn,
+ "cpu-release-addr", &temp);
+ bootaddr = temp;
+ } else {
+ ret = of_property_read_u32(dn,
+ "cpu-release-addr",
+ &bootaddr);
+ }
+ }
+ of_node_put(dn);
+ if (ret) {
+ pr_err("CPU#1: invalid cpu-release-addr property\n");
+ return;
+ }
+ pr_info("CPU#1: cpu-release-addr %08x\n", bootaddr);
+
+ cpu_bootaddr = ioremap(bootaddr, sizeof(bootaddr));
+}
+
+static const struct smp_operations r9a06g032_smp_ops __initconst = {
+ .smp_prepare_cpus = r9a06g032_smp_prepare_cpus,
+ .smp_boot_secondary = r9a06g032_smp_boot_secondary,
+};
+
+CPU_METHOD_OF_DECLARE(r9a06g032_smp,
+ "renesas,r9a06g032-smp", &r9a06g032_smp_ops);
--
2.7.4
^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v6 3/3] ARM: dts: Renesas R9A06G032 SMP enable method
2018-06-25 8:25 [PATCH v6 0/3] Renesas R9A06G032 SMP enabler Michel Pollet
2018-06-25 8:25 ` [PATCH v6 1/3] dt-bindings: cpu: Add Renesas R9A06G032 SMP enable method Michel Pollet
2018-06-25 8:25 ` [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver Michel Pollet
@ 2018-06-25 8:25 ` Michel Pollet
2 siblings, 0 replies; 7+ messages in thread
From: Michel Pollet @ 2018-06-25 8:25 UTC (permalink / raw)
To: linux-renesas-soc, Simon Horman
Cc: phil.edworthy, Michel Pollet, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Chen-Yu Tsai,
Douglas Anderson, Carlo Caione, Florian Fainelli, Rajendra Nayak,
devicetree, linux-kernel, linux-arm-kernel
Add a special enable method for the second CA7 of the R9A06G032
as well as the default value for the "cpu-release-addr" property.
Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
arch/arm/boot/dts/r9a06g032.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/boot/dts/r9a06g032.dtsi b/arch/arm/boot/dts/r9a06g032.dtsi
index 353e06f..3e45375 100644
--- a/arch/arm/boot/dts/r9a06g032.dtsi
+++ b/arch/arm/boot/dts/r9a06g032.dtsi
@@ -30,6 +30,8 @@
compatible = "arm,cortex-a7";
reg = <1>;
clocks = <&sysctrl R9A06G032_CLK_A7MP>;
+ enable-method = "renesas,r9a06g032-smp";
+ cpu-release-addr = <0 0x4000c204>;
};
};
--
2.7.4
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver
2018-06-25 8:25 ` [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver Michel Pollet
@ 2018-06-25 9:24 ` Geert Uytterhoeven
2018-06-25 9:42 ` Simon Horman
0 siblings, 1 reply; 7+ messages in thread
From: Geert Uytterhoeven @ 2018-06-25 9:24 UTC (permalink / raw)
To: Michel Pollet, Simon Horman
Cc: Linux-Renesas, Phil Edworthy, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Rajendra Nayak,
Maxime Ripard, Florian Fainelli, Andy Gross, Carlo Caione,
Stefan Wahren, Chen-Yu Tsai,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
Linux Kernel Mailing List, Linux ARM
Hi Michel,
On Mon, Jun 25, 2018 at 10:31 AM Michel Pollet
<michel.pollet@bp.renesas.com> wrote:
> The Renesas R9A06G032 second CA7 is parked in a ROM pen at boot time, it
> requires a special enable method to get it started.
>
> Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> arch/arm/mach-shmobile/Makefile | 1 +
> arch/arm/mach-shmobile/smp-r9a06g032.c | 96 ++++++++++++++++++++++++++++++++++
> 2 files changed, 97 insertions(+)
> create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
Given this doesn't depend on anything under arch/arm/mach-shmobile/,
perhaps this should be moved to drivers/soc/renesas/ (and renamed to
r9a06g032-smp.c for consistency) instead?
Simon: what do you think?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver
2018-06-25 9:24 ` Geert Uytterhoeven
@ 2018-06-25 9:42 ` Simon Horman
2018-06-25 10:37 ` Michel Pollet
0 siblings, 1 reply; 7+ messages in thread
From: Simon Horman @ 2018-06-25 9:42 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Michel Pollet, Linux-Renesas, Phil Edworthy, Michel Pollet,
Rob Herring, Mark Rutland, Magnus Damm, Russell King,
Rajendra Nayak, Maxime Ripard, Florian Fainelli, Andy Gross,
Carlo Caione, Stefan Wahren, Chen-Yu Tsai,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
Linux Kernel Mailing List, Linux ARM
On Mon, Jun 25, 2018 at 11:24:48AM +0200, Geert Uytterhoeven wrote:
> Hi Michel,
>
> On Mon, Jun 25, 2018 at 10:31 AM Michel Pollet
> <michel.pollet@bp.renesas.com> wrote:
> > The Renesas R9A06G032 second CA7 is parked in a ROM pen at boot time, it
> > requires a special enable method to get it started.
> >
> > Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> > ---
> > arch/arm/mach-shmobile/Makefile | 1 +
> > arch/arm/mach-shmobile/smp-r9a06g032.c | 96 ++++++++++++++++++++++++++++++++++
> > 2 files changed, 97 insertions(+)
> > create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
>
> Given this doesn't depend on anything under arch/arm/mach-shmobile/,
> perhaps this should be moved to drivers/soc/renesas/ (and renamed to
> r9a06g032-smp.c for consistency) instead?
>
> Simon: what do you think?
Yes, I think that would be nice.
^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver
2018-06-25 9:42 ` Simon Horman
@ 2018-06-25 10:37 ` Michel Pollet
0 siblings, 0 replies; 7+ messages in thread
From: Michel Pollet @ 2018-06-25 10:37 UTC (permalink / raw)
To: Simon Horman, Geert Uytterhoeven
Cc: Linux-Renesas, Phil Edworthy, Michel Pollet, Rob Herring,
Mark Rutland, Magnus Damm, Russell King, Rajendra Nayak,
Maxime Ripard, Florian Fainelli, Andy Gross, Carlo Caione,
Stefan Wahren, Chen-Yu Tsai,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
Linux Kernel Mailing List, Linux ARM
On 25 June 2018 10:43, Simon wrote:
>
> On Mon, Jun 25, 2018 at 11:24:48AM +0200, Geert Uytterhoeven wrote:
> > Hi Michel,
> >
> > On Mon, Jun 25, 2018 at 10:31 AM Michel Pollet
> > <michel.pollet@bp.renesas.com> wrote:
> > > The Renesas R9A06G032 second CA7 is parked in a ROM pen at boot
> > > time, it requires a special enable method to get it started.
> > >
> > > Signed-off-by: Michel Pollet <michel.pollet@bp.renesas.com>
> > > Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> > > ---
> > > arch/arm/mach-shmobile/Makefile | 1 +
> > > arch/arm/mach-shmobile/smp-r9a06g032.c | 96
> > > ++++++++++++++++++++++++++++++++++
> > > 2 files changed, 97 insertions(+)
> > > create mode 100644 arch/arm/mach-shmobile/smp-r9a06g032.c
> >
> > Given this doesn't depend on anything under arch/arm/mach-shmobile/,
> > perhaps this should be moved to drivers/soc/renesas/ (and renamed to
> > r9a06g032-smp.c for consistency) instead?
> >
> > Simon: what do you think?
>
> Yes, I think that would be nice.
So, do you guys want me to try to integrate this with the subsystem there, with
The renesas-soc bits, or should I just plonk the driver in and change the makefile?
Secondary question: is it to for me to repost with these changes ASAP?
Cheers
Michel
Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2018-06-25 8:25 [PATCH v6 0/3] Renesas R9A06G032 SMP enabler Michel Pollet
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2018-06-25 8:25 ` [PATCH v6 2/3] arm: shmobile: Add the R9A06G032 SMP enabler driver Michel Pollet
2018-06-25 9:24 ` Geert Uytterhoeven
2018-06-25 9:42 ` Simon Horman
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