diff options
| -rw-r--r-- | drivers/bus/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/bus/Makefile | 2 | ||||
| -rw-r--r-- | drivers/bus/arm-cci.c | 112 | ||||
| -rw-r--r-- | include/linux/arm-cci.h | 30 |
4 files changed, 148 insertions, 0 deletions
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 0f51ed687dc..d032f74ff21 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 45d997c8545..55aac809e5b 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 00000000000..11c15134408 --- /dev/null +++ b/drivers/bus/arm-cci.c @@ -0,0 +1,112 @@ +/* + * 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 CCI_STATUS_OFFSET 0xc +#define STATUS_CHANGE_PENDING (1 << 0) + +#define CCI_SLAVE_OFFSET(n) (0x1000 + 0x1000 * (n)) +#define CCI400_EAG_OFFSET CCI_SLAVE_OFFSET(3) +#define CCI400_KF_OFFSET CCI_SLAVE_OFFSET(4) + +#define DRIVER_NAME "CCI" +struct cci_drvdata { + void __iomem *baseaddr; +}; + +static struct cci_drvdata *info; + +void disable_cci(int cluster) +{ + u32 slave_reg = cluster ? CCI400_KF_OFFSET : CCI400_EAG_OFFSET; + writel_relaxed(0x0, info->baseaddr + slave_reg); + + while (readl_relaxed(info->baseaddr + CCI_STATUS_OFFSET) + & STATUS_CHANGE_PENDING) + barrier(); +} +EXPORT_SYMBOL_GPL(disable_cci); + +static int cci_driver_probe(struct platform_device *pdev) +{ + struct resource *res; + int ret = 0; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + dev_err(&pdev->dev, "unable to allocate mem\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "No memory resource\n"); + ret = -EINVAL; + goto mem_free; + } + + if (!request_mem_region(res->start, resource_size(res), + dev_name(&pdev->dev))) { + dev_err(&pdev->dev, "address 0x%x in use\n", (u32) res->start); + ret = -EBUSY; + goto mem_free; + } + + info->baseaddr = ioremap(res->start, resource_size(res)); + if (!info->baseaddr) { + ret = -EADDRNOTAVAIL; + goto ioremap_err; + } + + platform_set_drvdata(pdev, info); + + pr_info("CCI loaded at %p\n", info->baseaddr); + return ret; + +ioremap_err: + release_region(res->start, resource_size(res)); +mem_free: + kfree(info); + + return ret; +} + +static const struct of_device_id arm_cci_matches[] = { + {.compatible = "arm,cci"}, + {}, +}; + +static struct platform_driver cci_platform_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = arm_cci_matches, + }, + .probe = cci_driver_probe, +}; + +static int __init cci_init(void) +{ + return platform_driver_register(&cci_platform_driver); +} + +core_initcall(cci_init); diff --git a/include/linux/arm-cci.h b/include/linux/arm-cci.h new file mode 100644 index 00000000000..86ae587817a --- /dev/null +++ b/include/linux/arm-cci.h @@ -0,0 +1,30 @@ +/* + * CCI support + * + * Copyright (C) 2012-2013 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef __LINUX_ARM_CCI_H +#define __LINUX_ARM_CCI_H + +#ifdef CONFIG_ARM_CCI +extern void disable_cci(int cluster); +#else +static inline void disable_cci(int cluster) { } +#endif + +#endif |