From: Mirza Krak <mirza.krak@xxxxxxxxx>
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 <mirza.krak@xxxxxxxxx>
---
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 <linux/clk.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#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 <mirza.krak@xxxxxxxxx");
+MODULE_DESCRIPTION("NVIDIA Tegra NOR Bus Driver");
+MODULE_LICENSE("GPL");
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
