Hi Bartosz, Thank you for the patch. On Monday 17 Oct 2016 18:30:48 Bartosz Golaszewski wrote: > Create a new driver for the da8xx DDR2/mDDR controller and implement > support for writing to the Peripheral Bus Burst Priority Register. > > Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > --- > .../memory-controllers/ti-da8xx-ddrctl.txt | 25 +++++++ > drivers/memory/Kconfig | 8 +++ > drivers/memory/Makefile | 1 + > drivers/memory/da8xx-ddrctl.c | 77 +++++++++++++++++++ > 4 files changed, 111 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/memory-controllers/ti-da8xx-ddrctl.txt > create mode 100644 drivers/memory/da8xx-ddrctl.c > > diff --git > a/Documentation/devicetree/bindings/memory-controllers/ti-da8xx-ddrctl.txt > b/Documentation/devicetree/bindings/memory-controllers/ti-da8xx-ddrctl.txt > new file mode 100644 > index 0000000..e340404 > --- /dev/null > +++ > b/Documentation/devicetree/bindings/memory-controllers/ti-da8xx-ddrctl.txt > @@ -0,0 +1,25 @@ > +* Device tree bindings for Texas Instruments da8xx DDR2/mDDR memory > controller > + > +The DDR2/mDDR memory controller present on Texas Instruments da8xx SoCs > memory > +maps a set of registers which allow to tweak the controller's behavior. > + > +Documentation: > +OMAP-L138 (DA850) - http://www.ti.com/lit/ug/spruh82c/spruh82c.pdf > + > +Required properties: > + > +- compatible: "ti,da850-ddrctl" Don't you need a reg property ? > +Optional properties: > + > +- ti,pr-old-count: Priority raise old counter. Specifies the number of > + memory transfers after which the DDR2/mDDR memory > + controller will elevate the priority of the oldest > + command in the command FIFO. Must be between 0-255. Isn't this a system configuration more than a hardware description ? > +Example for da850 shown below. > + > +ddrctl { > + compatible = "ti,da850-ddrctl"; > + ti,pr-old-count = <0x20>; > +}; > diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig > index 4b4c0c3..ec80e35 100644 > --- a/drivers/memory/Kconfig > +++ b/drivers/memory/Kconfig > @@ -134,6 +134,14 @@ config MTK_SMI > mainly help enable/disable iommu and control the power domain and > clocks for each local arbiter. > > +config DA8XX_DDRCTL > + bool "Texas Instruments da8xx DDR2/mDDR driver" > + depends on ARCH_DAVINCI_DA8XX > + help > + This driver is for the DDR2/mDDR Memory Controller present on > + Texas Instruments da8xx SoCs. It's used to tweak various memory > + controller configuration options. > + > source "drivers/memory/samsung/Kconfig" > source "drivers/memory/tegra/Kconfig" > > diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile > index b20ae38..e88097fb 100644 > --- a/drivers/memory/Makefile > +++ b/drivers/memory/Makefile > @@ -17,6 +17,7 @@ obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o > obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o > obj-$(CONFIG_JZ4780_NEMC) += jz4780-nemc.o > obj-$(CONFIG_MTK_SMI) += mtk-smi.o > +obj-$(CONFIG_DA8XX_DDRCTL) += da8xx-ddrctl.o > > obj-$(CONFIG_SAMSUNG_MC) += samsung/ > obj-$(CONFIG_TEGRA_MC) += tegra/ > diff --git a/drivers/memory/da8xx-ddrctl.c b/drivers/memory/da8xx-ddrctl.c > new file mode 100644 > index 0000000..dcd0a61 > --- /dev/null > +++ b/drivers/memory/da8xx-ddrctl.c > @@ -0,0 +1,77 @@ > +/* > + * TI da8xx DDR2/mDDR controller driver > + * > + * Copyright (C) 2016 BayLibre SAS > + * > + * Author: > + * Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > + * > + * 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. > + */ > + > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/io.h> > + > +#define DA8XX_DDR_CTL_BASE 0xB0000000 > +#define DA8XX_PBBPR_OFFSET 0x00000020 > +#define DA8XX_PBBPR_REG(p) ((p) + DA8XX_PBBPR_OFFSET) > + > +#define DA8XX_PBBPR_MAX 0xff > + > +static void da8xx_ddrctl_set_pbbpr(void __iomem *ddrctl, struct device > *dev) +{ > + struct device_node *node = dev->of_node; > + u32 pr_old_count; > + int ret; > + > + ret = of_property_read_u32(node, "ti,pr-old-count", &pr_old_count); > + if (ret) > + return; > + > + if (pr_old_count > DA8XX_PBBPR_MAX) { > + dev_warn(dev, "priority raise old counter value too high\n"); > + return; > + } > + > + __raw_writel(pr_old_count, DA8XX_PBBPR_REG(ddrctl)); > +} > + > +static int da8xx_ddrctl_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + void __iomem *ddrctl; > + > + ddrctl = ioremap(DA8XX_DDR_CTL_BASE, SZ_256); > + if (!ddrctl) { > + dev_err(dev, "unable to map memory controller registers\n"); > + return -EIO; > + } > + > + da8xx_ddrctl_set_pbbpr(ddrctl, dev); > + > + iounmap(ddrctl); > + > + return 0; > +} > + > +static const struct of_device_id da8xx_ddrctl_of_match[] = { > + { .compatible = "ti,da850-ddrctl", }, > + { }, > +}; > + > +static struct platform_driver da8xx_ddrctl_driver = { > + .probe = da8xx_ddrctl_probe, > + .driver = { > + .name = "da8xx-ddrctl", > + .of_match_table = da8xx_ddrctl_of_match, > + }, > +}; > +module_platform_driver(da8xx_ddrctl_driver); > + > +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("TI da8xx DDR2/mDDR controller driver"); > +MODULE_LICENSE("GPL v2"); -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
