[PATCH 2/3] ARM: bus: da8xx-syscfg: new driver

Bartosz Golaszewski
2016-10-17T16:31:37Z

Create the driver for the da8xx System Configuration and implement
support for writing to the three Master Priority registers.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
.../devicetree/bindings/bus/ti,da850-syscfg.txt | 63 +++++++
drivers/bus/Kconfig | 8 +
drivers/bus/Makefile | 2 +
drivers/bus/da8xx-syscfg.c | 206 +++++++++++++++++++++
4 files changed, 279 insertions(+)
create mode 100644 Documentation/devicetree/bindings/bus/ti,da850-syscfg.txt
create mode 100644 drivers/bus/da8xx-syscfg.c

diff --git a/Documentation/devicetree/bindings/bus/ti,da850-syscfg.txt b/Documentation/devicetree/bindings/bus/ti,da850-syscfg.txt
new file mode 100644
index 0000000..07e5c38
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/ti,da850-syscfg.txt
@@ -0,0 +1,63 @@
+* Device tree bindings for Texas Instruments da8xx system configuration driver
+
+The system configuration (SYSCFG) module is a system-level module containing
+status and top level control logic required by the device. The system
+configuration module consists of a set of memory-mapped status and control
+registers, accessible by the CPU, supporting all of the following system
+features, and miscellaneous functions and operations.
+
+Documentation:
+OMAP-L138 (DA850) - http://www.ti.com/lit/ug/spruh82c/spruh82c.pdf
+
+Required properties:
+
+- compatible: "ti,da850-syscfg"
+
+Optional properties:
+
+The below properties are used to specify the priority of master peripherals.
+They must be between 0-7 where 0 is the highest priority and 7 is the lowest.
+
+- ti,pri-arm-i: ARM_I port priority.
+
+- ti,pri-arm-d: ARM_D port priority.
+
+- ti,pri-upp: uPP port priority.
+
+- ti,pri-sata: SATA port priority.
+
+- ti,pri-pru0: PRU0 port priority.
+
+- ti,pri-pru1: PRU1 port priority.
+
+- ti,pri-edma30tc0: EDMA3_0_TC0 port priority.
+
+- ti,pri-edma30tc1: EDMA3_0_TC1 port priority.
+
+- ti,pri-edma31tc0: EDMA3_1_TC0 port priority.
+
+- ti,pri-vpif-dma-0: VPIF DMA0 port priority.
+
+- ti,pri-vpif-dma-1: VPIF DMA1 port priority.
+
+- ti,pri-emac: EMAC port priority.
+
+- ti,pri-usb0cfg: USB0 CFG port priority.
+
+- ti,pri-usb0cdma: USB0 CDMA port priority.
+
+- ti,pri-uhpi: HPI port priority.
+
+- ti,pri-usb1: USB1 port priority.
+
+- ti,pri-lcdc: LCDC port priority.
+
+If any of the above properties is absent, the default value will be used as
+defined in the documentation.
+
+Example for da850-lcdk is shown below.
+
+mstpri {
+ compatible = "ti,da850-mstpri";
+ ti,pri-lcdc = 0;
+};
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 5a2d47c..6276132 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -165,4 +165,12 @@ config VEXPRESS_CONFIG
help
Platform configuration infrastructure for the ARM Ltd.
Versatile Express.
+
+config DA8XX_SYSCFG
+ bool "TI da8xx system configuration driver"
+ depends on ARCH_DAVINCI_DA8XX
+ help
+ Driver for Texas Instruments da8xx system configuration. Allows to
+ adjust various SoC configuration options.
+
endmenu
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index c6cfa6b..3cba66a 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -21,3 +21,5 @@ obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o
obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o
obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o
+
+obj-$(CONFIG_DA8XX_SYSCFG) += da8xx-syscfg.o
diff --git a/drivers/bus/da8xx-syscfg.c b/drivers/bus/da8xx-syscfg.c
new file mode 100644
index 0000000..8a2cb4f
--- /dev/null
+++ b/drivers/bus/da8xx-syscfg.c
@@ -0,0 +1,206 @@
+/*
+ * TI da8xx System Configuration driver
+ *
+ * Copyright (C) 2016 BayLibre SAS
+ *
+ * Author:
+ * Bartosz Golaszewski <bgolaszewski@baylibre.com.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.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#define DA8XX_IO_PHYS 0x01c00000ul
+#define DA8XX_SYSCFG0_BASE (DA8XX_IO_PHYS + 0x14000)
+
+#define DA8XX_MSTPRI0_REG 0x110
+#define DA8XX_MSTPRI1_REG 0x114
+#define DA8XX_MSTPRI2_REG 0x118
+
+#define DA8XX_MSTPRI_MAX 7
+
+struct da8xx_mstpri_descr {
+ const char *property;
+ int reg;
+ int shift;
+ int mask;
+};
+
+static const struct da8xx_mstpri_descr priorities[] = {
+ {
+ .property = "ti,pri-arm-i",
+ .reg = DA8XX_MSTPRI0_REG,
+ .shift = 0,
+ .mask = 0xfffffff0,
+ },
+ {
+ .property = "ti,pri-arm-d",
+ .reg = DA8XX_MSTPRI0_REG,
+ .shift = 4,
+ .mask = 0xffffff0f,
+ },
+ {
+ .property = "ti,pri-upp",
+ .reg = DA8XX_MSTPRI0_REG,
+ .shift = 16,
+ .mask = 0xfff0ffff,
+ },
+ {
+ .property = "ti,pri-sata",
+ .reg = DA8XX_MSTPRI0_REG,
+ .shift = 20,
+ .mask = 0xff0fffff,
+ },
+ {
+ .property = "ti,pri-pru0",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 0,
+ .mask = 0xfffffff0,
+ },
+ {
+ .property = "ti,pri-pru1",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 4,
+ .mask = 0xffffff0f,
+ },
+ {
+ .property = "ti,pri-edma30tc0",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 8,
+ .mask = 0xfffff0ff,
+ },
+ {
+ .property = "ti,pri-edma30tc1",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 12,
+ .mask = 0xffff0fff,
+ },
+ {
+ .property = "ti,pri-edma31tc0",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 16,
+ .mask = 0xfff0ffff,
+ },
+ {
+ .property = "ti,pri-vpif-dma-0",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 24,
+ .mask = 0xf0ffffff,
+ },
+ {
+ .property = "ti,pri-vpif-dma-1",
+ .reg = DA8XX_MSTPRI1_REG,
+ .shift = 28,
+ .mask = 0x0fffffff,
+ },
+ {
+ .property = "ti,pri-emac",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 0,
+ .mask = 0xfffffff0,
+ },
+ {
+ .property = "ti,pri-usb0cfg",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 8,
+ .mask = 0xfffff0ff,
+ },
+ {
+ .property = "ti,pri-usb0cdma",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 12,
+ .mask = 0xffff0fff,
+ },
+ {
+ .property = "ti,pri-uhpi",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 20,
+ .mask = 0xff0fffff,
+ },
+ {
+ .property = "ti,pri-usb1",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 24,
+ .mask = 0xf0ffffff,
+ },
+ {
+ .property = "ti,pri-lcdc",
+ .reg = DA8XX_MSTPRI2_REG,
+ .shift = 28,
+ .mask = 0x0fffffff,
+ },
+};
+
+static void da8xx_syscfg_set_mstpri(void __iomem *syscfg0, struct device *dev)
+{
+ const struct da8xx_mstpri_descr *pri_descr;
+ struct device_node *node = dev->of_node;
+ void __iomem *mstpri;
+ u32 old_pri, new_pri;
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(priorities); i++) {
+ pri_descr = &priorities[i];
+
+ ret = of_property_read_u32(node, pri_descr->property, &new_pri);
+ if (ret)
+ continue;
+
+ if (new_pri > DA8XX_MSTPRI_MAX) {
+ dev_warn(dev,
+ "omitting property '%s' - value too high\n",
+ pri_descr->property);
+ continue;
+ }
+
+ mstpri = syscfg0 + pri_descr->reg;
+ old_pri = __raw_readl(mstpri);
+ old_pri &= pri_descr->mask;
+ new_pri <<= pri_descr->shift;
+ new_pri |= old_pri;
+
+ __raw_writel(new_pri, mstpri);
+ }
+}
+
+static int da8xx_syscfg_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ void __iomem *syscfg0;
+
+ syscfg0 = ioremap(DA8XX_SYSCFG0_BASE, SZ_4K);
+ if (!syscfg0) {
+ dev_err(dev, "unable to map syscfg0\n");
+ return -EIO;
+ }
+
+ da8xx_syscfg_set_mstpri(syscfg0, dev);
+
+ iounmap(syscfg0);
+
+ return 0;
+}
+
+static const struct of_device_id da8xx_syscfg_of_match[] = {
+ { .compatible = "ti,da850-syscfg", },
+ { },
+};
+
+static struct platform_driver da8xx_syscfg_driver = {
+ .probe = da8xx_syscfg_probe,
+ .driver = {
+ .name = "da8xx-syscfg",
+ .of_match_table = da8xx_syscfg_of_match,
+ },
+};
+module_platform_driver(da8xx_syscfg_driver);
+
+MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
+MODULE_DESCRIPTION("TI da8xx System Configuration driver");
+MODULE_LICENSE("GPL v2");
--
2.9.3