From: santosh.shilimkar@ti•com (Santosh Shilimkar)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v3 12/15] drivers/bus: add ARM CCI support
Date: Fri, 1 Feb 2013 11:31:52 +0530 [thread overview]
Message-ID: <510B5A50.3090003@ti.com> (raw)
In-Reply-To: <1359445870-18925-13-git-send-email-nicolas.pitre@linaro.org>
On Tuesday 29 January 2013 01:21 PM, Nicolas Pitre wrote:
> From: Lorenzo Pieralisi <lorenzo.pieralisi@arm•com>
>
> On ARM multi-cluster systems coherency between cores running on
> different clusters is managed by the cache-coherent interconnect (CCI).
> It allows broadcasting of TLB invalidates and memory barriers and it
> guarantees cache coherency at system level.
>
> This patch enables the basic infrastructure required in Linux to
> handle and programme the CCI component. The first implementation is
> based on a platform device, its relative DT compatible property and
> a simple programming interface.
>
> Signed-off-by: Nicolas Pitre <nico@linaro•org>
> ---
> drivers/bus/Kconfig | 4 ++
> drivers/bus/Makefile | 2 +
> drivers/bus/arm-cci.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/arm-cci.h | 30 ++++++++++++++
> 4 files changed, 143 insertions(+)
> create mode 100644 drivers/bus/arm-cci.c
> create mode 100644 include/linux/arm-cci.h
>
> diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
> index 0f51ed687d..d032f74ff2 100644
> --- a/drivers/bus/Kconfig
> +++ b/drivers/bus/Kconfig
> @@ -19,4 +19,8 @@ config OMAP_INTERCONNECT
>
> help
> Driver to enable OMAP interconnect error handling driver.
> +
> +config ARM_CCI
> + bool "ARM CCI driver support"
> +
> endmenu
> diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
> index 45d997c854..55aac809e5 100644
> --- a/drivers/bus/Makefile
> +++ b/drivers/bus/Makefile
> @@ -6,3 +6,5 @@ obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
>
> # Interconnect bus driver for OMAP SoCs.
> obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o
> +
> +obj-$(CONFIG_ARM_CCI) += arm-cci.o
> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
> new file mode 100644
> index 0000000000..25ae156924
> --- /dev/null
> +++ b/drivers/bus/arm-cci.c
> @@ -0,0 +1,107 @@
> +/*
> + * ARM Cache Coherency Interconnect (CCI400) support
> + *
> + * Copyright (C) 2012-2013 ARM Ltd.
> + * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm•com>
> + *
> + * 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.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/arm-cci.h>
> +
> +#define CCI400_EAG_OFFSET 0x4000
> +#define CCI400_KF_OFFSET 0x5000
> +
> +#define DRIVER_NAME "CCI"
> +struct cci_drvdata {
> + void __iomem *baseaddr;
> + spinlock_t lock;
> +};
> +
> +static struct cci_drvdata *info;
> +
> +void disable_cci(int cluster)
> +{
> + u32 cci_reg = cluster ? CCI400_KF_OFFSET : CCI400_EAG_OFFSET;
> + writel_relaxed(0x0, info->baseaddr + cci_reg);
> +
> + while (readl_relaxed(info->baseaddr + 0xc) & 0x1)
0xc ? Is that a status register ? A define for the same would be
good. Rest of the patch looks fine.
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti•com>
next prev parent reply other threads:[~2013-02-01 6:01 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-29 7:50 [PATCH v3 00/15] multi-cluster power management Nicolas Pitre
2013-01-29 7:50 ` [PATCH v3 01/15] ARM: multi-cluster PM: secondary kernel entry code Nicolas Pitre
2013-01-31 15:45 ` Santosh Shilimkar
2013-01-29 7:50 ` [PATCH v3 02/15] ARM: mcpm: introduce the CPU/cluster power API Nicolas Pitre
2013-01-31 15:55 ` Santosh Shilimkar
2013-01-29 7:50 ` [PATCH v3 03/15] ARM: mcpm: introduce helpers for platform coherency exit/setup Nicolas Pitre
2013-01-31 16:08 ` Santosh Shilimkar
2013-01-31 17:16 ` Nicolas Pitre
2013-02-01 5:10 ` Santosh Shilimkar
2013-02-01 17:26 ` Nicolas Pitre
2013-01-29 7:50 ` [PATCH v3 04/15] ARM: mcpm: Add baremetal voting mutexes Nicolas Pitre
2013-02-01 5:29 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 05/15] ARM: mcpm_head.S: vlock-based first man election Nicolas Pitre
2013-02-01 5:34 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 06/15] ARM: mcpm: generic SMP secondary bringup and hotplug support Nicolas Pitre
2013-01-29 20:38 ` Rob Herring
2013-02-01 5:38 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 07/15] ARM: vexpress: Select the correct SMP operations at run-time Nicolas Pitre
2013-01-29 15:43 ` Jon Medhurst (Tixy)
2013-01-29 19:26 ` Nicolas Pitre
2013-02-01 5:41 ` Santosh Shilimkar
2013-02-01 17:28 ` Nicolas Pitre
2013-01-29 7:51 ` [PATCH v3 08/15] ARM: introduce common set_auxcr/get_auxcr functions Nicolas Pitre
2013-02-01 5:44 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 09/15] ARM: vexpress: introduce DCSCB support Nicolas Pitre
2013-02-01 5:50 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 10/15] ARM: vexpress/dcscb: add CPU use counts to the power up/down API implementation Nicolas Pitre
2013-02-01 5:53 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 11/15] ARM: vexpress/dcscb: do not hardcode number of CPUs per cluster Nicolas Pitre
2013-02-01 5:57 ` Santosh Shilimkar
2013-02-01 17:24 ` Nicolas Pitre
2013-02-02 6:54 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 12/15] drivers/bus: add ARM CCI support Nicolas Pitre
2013-02-01 6:01 ` Santosh Shilimkar [this message]
2013-01-29 7:51 ` [PATCH v3 13/15] ARM: CCI: ensure powerdown-time data is flushed from cache Nicolas Pitre
2013-02-01 6:13 ` Santosh Shilimkar
2013-02-02 22:23 ` Nicolas Pitre
2013-02-03 10:07 ` Santosh Shilimkar
2013-02-03 18:29 ` Nicolas Pitre
2013-02-04 5:25 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 14/15] ARM: vexpress/dcscb: handle platform coherency exit/setup and CCI Nicolas Pitre
2013-01-29 10:46 ` Lorenzo Pieralisi
2013-01-29 18:42 ` Nicolas Pitre
2013-01-30 17:27 ` Lorenzo Pieralisi
2013-02-01 6:15 ` Santosh Shilimkar
2013-01-29 7:51 ` [PATCH v3 15/15] ARM: vexpress/dcscb: probe via device tree Nicolas Pitre
2013-01-29 21:01 ` Rob Herring
2013-01-29 21:41 ` Nicolas Pitre
2013-01-30 12:22 ` Achin Gupta
2013-01-30 17:43 ` Nicolas Pitre
2013-01-31 10:54 ` Dave Martin
2013-02-04 4:39 ` Nicolas Pitre
2013-02-04 14:24 ` [PATCH v3 00/15] multi-cluster power management Will Deacon
2013-02-04 20:59 ` Nicolas Pitre
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