From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1W8RTY-000479-7F for barebox@lists.infradead.org; Wed, 29 Jan 2014 09:30:29 +0000 From: Sascha Hauer Date: Wed, 29 Jan 2014 10:30:00 +0100 Message-Id: <1390987800-18095-2-git-send-email-s.hauer@pengutronix.de> In-Reply-To: <1390987800-18095-1-git-send-email-s.hauer@pengutronix.de> References: <1390987800-18095-1-git-send-email-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] misc: Add devicetree SRAM driver To: barebox@lists.infradead.org Signed-off-by: Sascha Hauer --- drivers/misc/Kconfig | 6 +++++ drivers/misc/Makefile | 1 + drivers/misc/sram.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 82 insertions(+) create mode 100644 drivers/misc/sram.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index e59c4f1..c34a4af 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -9,4 +9,10 @@ config JTAG depends on GENERIC_GPIO help Controls JTAG chains connected to I/O pins + +config SRAM + bool "Generic SRAM driver" + help + This driver adds support for memory mapped SRAM. + endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index b085577..908c8cb 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_JTAG) += jtag.o +obj-$(CONFIG_SRAM) += sram.o diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c new file mode 100644 index 0000000..7ea23b7 --- /dev/null +++ b/drivers/misc/sram.c @@ -0,0 +1,75 @@ +/* + * drivers/misc/sram.c - generic memory mapped SRAM driver + * + * 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. + */ + +#include +#include +#include +#include +#include + +struct sram { + struct resource *res; + char *name; + struct cdev cdev; +}; + +static struct file_operations memops = { + .read = mem_read, + .write = mem_write, + .memmap = generic_memmap_rw, + .lseek = dev_lseek_default, +}; + +static int sram_probe(struct device_d *dev) +{ + struct sram *sram; + struct resource *res; + void __iomem *base; + int ret; + + base = dev_request_mem_region(dev, 0); + if (!base) + return -EBUSY; + + sram = xzalloc(sizeof(*sram)); + + sram->cdev.name = asprintf("sram%d", + cdev_find_free_index("sram")); + + res = dev_get_resource(dev, 0); + + sram->cdev.size = (unsigned long)resource_size(res); + sram->cdev.ops = &memops; + sram->cdev.dev = dev; + + ret = devfs_create(&sram->cdev); + if (ret) + return ret; + + return 0; +} + +static __maybe_unused struct of_device_id sram_dt_ids[] = { + { + .compatible = "mmio-sram", + }, { + }, +}; + +static struct driver_d sram_driver = { + .name = "mmio-sram", + .probe = sram_probe, + .of_compatible = sram_dt_ids, +}; +device_platform_driver(sram_driver); -- 1.8.5.3 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox