From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko =?ISO-8859-1?Q?St=FCbner?= Subject: Re: [PATCH 2/2] clocksource: add rockchip-specific armv7-timer setup Date: Fri, 20 Jun 2014 13:27:26 +0200 Message-ID: <1653387.oFu7qPFqm3@diego> References: <70167479.zcs3JF0luJ@diego> <3807304.rhf3VZXZNa@diego> <20140620105123.GH30188@leverpostej> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20140620105123.GH30188@leverpostej> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Mark Rutland Cc: Daniel Lezcano , Thomas Gleixner , Rob Herring , Pawel Moll , Ian Campbell , Kumar Gala , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , Arnd Bergmann , Matthias Brugger List-Id: devicetree@vger.kernel.org Am Freitag, 20. Juni 2014, 11:51:23 schrieb Mark Rutland: > On Fri, Jun 20, 2014 at 11:44:49AM +0100, Heiko St=FCbner wrote: > > The armv7-timer on Rockchip RK3288 SoCs needs an underlying timer t= o run. > > Therefore the special rockchip,rk3288-armv7-timer does this setup a= nd > > then initializes the architected timer using the new locally expose= d > > arch_timer_init. > >=20 > > Suggested-by: Arnd Bergmann > > Signed-off-by: Heiko Stuebner > > --- > >=20 > > .../bindings/arm/rockchip/armv7-timer.txt | 22 +++++++++ > > drivers/clocksource/Makefile | 1 + > > drivers/clocksource/rockchip_timer.c | 57 > > ++++++++++++++++++++++ 3 files changed, 80 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/arm/rockchip/armv7-timer.txt cre= ate > > mode 100644 drivers/clocksource/rockchip_timer.c > >=20 > > diff --git > > a/Documentation/devicetree/bindings/arm/rockchip/armv7-timer.txt > > b/Documentation/devicetree/bindings/arm/rockchip/armv7-timer.txt ne= w file > > mode 100644 > > index 0000000..4c1950a > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/arm/rockchip/armv7-timer.tx= t > > @@ -0,0 +1,22 @@ > > +Rockchip armv7-timer: > > +--------------------- > > + > > +The architected timer on rk3288 SoCs has special setup requirement= s, as > > +the cpu-timer block needs to supply the architected timer. > > + > > +Required node properties: > > +- compatible value : =3D "rockchip,rk3288-armv7-timer"; > > +- reg : physical base address and the size of the registers window > > + of the supplying timer block > > +- CP15 Timer node properties as described in bindings/arm/arch_tim= er.txt > > + > > +Example: > > + > > +architected-timer { > > + compatible =3D "rockchip,rk3288-armv7-timer"; > > + reg =3D <0xff810020 0x20>; > > + interrupts =3D > IRQ_TYPE_LEVEL_HIGH)>, > > + , > > + ; > > + clock-frequency =3D <24000000>; > > +}; > > diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Mak= efile > > index 800b130..cbad225 100644 > > --- a/drivers/clocksource/Makefile > > +++ b/drivers/clocksource/Makefile > > @@ -20,6 +20,7 @@ obj-$(CONFIG_ARCH_MARCO) +=3D timer-marco.o > >=20 > > obj-$(CONFIG_ARCH_MOXART) +=3D moxart_timer.o > > obj-$(CONFIG_ARCH_MXS) +=3D mxs_timer.o > > obj-$(CONFIG_ARCH_PRIMA2) +=3D timer-prima2.o > >=20 > > +obj-$(CONFIG_ARCH_ROCKCHIP) +=3D rockchip_timer.o > >=20 > > obj-$(CONFIG_ARCH_U300) +=3D timer-u300.o > > obj-$(CONFIG_SUN4I_TIMER) +=3D sun4i_timer.o > > obj-$(CONFIG_SUN5I_HSTIMER) +=3D timer-sun5i.o > >=20 > > diff --git a/drivers/clocksource/rockchip_timer.c > > b/drivers/clocksource/rockchip_timer.c new file mode 100644 > > index 0000000..46c2146 > > --- /dev/null > > +++ b/drivers/clocksource/rockchip_timer.c > > @@ -0,0 +1,57 @@ > > +/* > > + * Copyright (c) 2014 MundoReader S.L. > > + * Author: Heiko Stuebner > > + * > > + * This program is free software; you can redistribute it and/or m= odify > > + * it under the terms of the GNU General Public License as publish= ed by > > + * the Free Software Foundation; either version 2 of the License, = or > > + * (at your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include "arm_arch_timer.h" > > + > > +#define TIMER_LOAD_COUNT0 0x00 > > +#define TIMER_LOAD_COUNT1 0x04 > > +#define TIMER_CURRENT_VALUE0 0x08 > > +#define TIMER_CURRENT_VALUE1 0x0c > > +#define TIMER_CONTROL_REG 0x10 > > +#define TIMER_INT_STATUS 0x18 > > + > > +#define TIMER_DISABLE (0 << 0) > > +#define TIMER_ENABLE (1 << 0) > > +#define TIMER_MODE_FREE_RUNNING (0 << 1) > > +#define TIMER_MODE_USER_DEFINED_COUNT (1 << 1) > > +#define TIMER_INT_MASK (0 << 2) > > +#define TIMER_INT_UNMASK (1 << 2) > > + > > +static __init void rk3288_arch_timer_init(struct device_node *np) > > +{ > > + void __iomem *reg_base; > > + > > + reg_base =3D of_io_request_and_map(np, 0, "rk3288-armv7-timer"); > > + if (!reg_base) { > > + pr_warn("%s: Can't get resource\n", __func__); > > + return; > > + } > > + > > + writel(TIMER_DISABLE, reg_base + TIMER_CONTROL_REG); > > + > > + writel(0xffffffff, reg_base + TIMER_LOAD_COUNT0); > > + writel(0xffffffff, reg_base + TIMER_LOAD_COUNT1); > > + > > + writel(TIMER_ENABLE | TIMER_MODE_FREE_RUNNING, > > + reg_base + TIMER_CONTROL_REG); >=20 > Given that this is unconditionally set up in this way, could this not= be > done in the fimrware/bootloader? >=20 > That way you could also setup CNTFREQ correctly, and virtualisation c= an > just work out of the box. It always comes back to this :-) . And as always the counter-argument w= ould be=20 that I cannot influence the current bootloader, there are already devic= es=20 shipping in this constellation. And of course quite some more SoCs usin= g this=20 pattern. > This looks like a clock driver in disguise... Yeah, that was my other idea - doing this as a clock. So would you be o= k, with=20 the arch-timer getting the possibility to handle an optional clock? Thanks Heiko -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html