From mboxrd@z Thu Jan 1 00:00:00 1970 From: mirza.krak@gmail.com (Mirza Krak) Date: Tue, 19 Jul 2016 15:36:37 +0200 Subject: [RFC 6/6] bus: Add support for Tegra NOR controller In-Reply-To: <1468935397-11926-1-git-send-email-mirza.krak@gmail.com> References: <1468935397-11926-1-git-send-email-mirza.krak@gmail.com> Message-ID: <1468935397-11926-7-git-send-email-mirza.krak@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Mirza Krak The NOR bus can be used to connect high-speed devices such as NOR flash, FPGAs, DSPs, CAN chips, Wi-Fi chips etc. Signed-off-by: Mirza Krak --- drivers/bus/Kconfig | 7 +++ drivers/bus/Makefile | 1 + drivers/bus/tegra-nor.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 drivers/bus/tegra-nor.c diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 3b205e2..b74be7d8 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -145,6 +145,13 @@ config TEGRA_ACONNECT Driver for the Tegra ACONNECT bus which is used to interface with the devices inside the Audio Processing Engine (APE) for Tegra210. +config TEGRA_NOR + tristate "Nvidia Tegra NOR flash bus driver a.k.a GMI/SNOR" + depends on ARCH_TEGRA_2x_SOC || ARCH_TEGRA_3x_SOC + depends on OF + help + Driver for NOR flash bus found on Tegra30/20 SOC`s. + config UNIPHIER_SYSTEM_BUS tristate "UniPhier System Bus driver" depends on ARCH_UNIPHIER && OF diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index ac84cc4..46d0129 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -18,5 +18,6 @@ obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o obj-$(CONFIG_SUNXI_RSB) += sunxi-rsb.o obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o +obj-$(CONFIG_TEGRA_NOR) += tegra-nor.o obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o diff --git a/drivers/bus/tegra-nor.c b/drivers/bus/tegra-nor.c new file mode 100644 index 0000000..1e48113 --- /dev/null +++ b/drivers/bus/tegra-nor.c @@ -0,0 +1,118 @@ +/* + * Driver for Nvidia NOR Flash bus a.k.a SNOR/GMI. + * + * Copyright (C) 2016 Host Mobility AB. All rights reserved. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include + +#define TEGRA_NOR_TIMING_REG_COUNT 2 + +#define TEGRA_NOR_CONFIG 0x00 +#define TEGRA_NOR_STATUS 0x04 +#define TEGRA_NOR_ADDR_PTR 0x08 +#define TEGRA_NOR_AHB_ADDR_PTR 0x0c +#define TEGRA_NOR_TIMING0 0x10 +#define TEGRA_NOR_TIMING1 0x14 +#define TEGRA_NOR_MIO_CONFIG 0x18 +#define TEGRA_NOR_MIO_TIMING 0x1c +#define TEGRA_NOR_DMA_CONFIG 0x20 +#define TEGRA_NOR_CS_MUX_CONFIG 0x24 + +#define TEGRA_NOR_CONFIG_GO BIT(31) + +static const struct of_device_id nor_id_table[] = { + /* Tegra30 */ + { .compatible = "nvidia,tegra30-nor", .data = NULL, }, + /* Tegra20 */ + { .compatible = "nvidia,tegra20-nor", .data = NULL, }, + + { } +}; +MODULE_DEVICE_TABLE(of, nor_id_table); + + +static int __init nor_parse_dt(struct platform_device *pdev, + void __iomem *base) +{ + struct device_node *of_node = pdev->dev.of_node; + u32 config, timing[TEGRA_NOR_TIMING_REG_COUNT]; + int ret; + + ret = of_property_read_u32_array(of_node, "nvidia,cs-timing", + timing, TEGRA_NOR_TIMING_REG_COUNT); + if (!ret) { + writel(timing[0], base + TEGRA_NOR_TIMING0); + writel(timing[1], base + TEGRA_NOR_TIMING1); + } + + ret = of_property_read_u32(of_node, "nvidia,config", &config); + if (ret) + return ret; + + config |= TEGRA_NOR_CONFIG_GO; + writel(config, base + TEGRA_NOR_CONFIG); + + if (of_get_child_count(of_node)) + ret = of_platform_populate(of_node, + of_default_bus_match_table, + NULL, &pdev->dev); + + return ret; +} + +static int __init nor_probe(struct platform_device *pdev) +{ + struct resource *res; + struct clk *clk; + void __iomem *base; + int ret; + + /* get the resource */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + /* get the clock */ + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + /* parse the device node */ + ret = nor_parse_dt(pdev, base); + if (ret) { + dev_err(&pdev->dev, "%s fail to create devices.\n", + pdev->dev.of_node->full_name); + clk_disable_unprepare(clk); + return ret; + } + + dev_info(&pdev->dev, "Driver registered.\n"); + return 0; +} + +static struct platform_driver nor_driver = { + .driver = { + .name = "tegra-nor", + .of_match_table = nor_id_table, + }, +}; +module_platform_driver_probe(nor_driver, nor_probe); + +MODULE_AUTHOR("Mirza Krak