[PATCH 6/6] bus: Add support for Tegra Generic Memory Interface

Mirza Krak
2016-08-06T19:40:52Z

From: Mirza Krak <mirza.krak@gmail.com>

The Generic Memory Interface bus can be used to connect high-speed
devices such as NOR flash, FPGAs, DSPs...

Signed-off-by: Mirza Krak <mirza.krak@gmail.com>
---
drivers/bus/Kconfig | 7 ++
drivers/bus/Makefile | 1 +
drivers/bus/tegra-gmi.c | 224 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 232 insertions(+)
create mode 100644 drivers/bus/tegra-gmi.c

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index 3b205e2..88bbf2c 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_GMI
+ tristate "Tegra Generic Memory Interface bus driver"
+ depends on ARCH_TEGRA
+ help
+ Driver for the Tegra Generic Memory Interface bus which can be used
+ to attach devices such as NOR, UART, FPGA and more.
+
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..34e2bab 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-$(CONFIG_TEGRA_GMI) += tegra-gmi.o
obj-$(CONFIG_UNIPHIER_SYSTEM_BUS) += uniphier-system-bus.o
obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o
diff --git a/drivers/bus/tegra-gmi.c b/drivers/bus/tegra-gmi.c
new file mode 100644
index 0000000..7a45442
--- /dev/null
+++ b/drivers/bus/tegra-gmi.c
@@ -0,0 +1,224 @@
+/*
+ * Driver for NVIDIA Generic Memory Interface
+ *
+ * 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/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/reset.h>
+
+#define TEGRA_GMI_CONFIG 0x00
+#define TEGRA_GMI_CONFIG_GO BIT(31)
+#define TEGRA_GMI_BUS_WIDTH_32BIT BIT(30)
+#define TEGRA_GMI_MUX_MODE BIT(28)
+#define TEGRA_GMI_RDY_BEFORE_DATA BIT(24)
+#define TEGRA_GMI_RDY_ACTIVE_HIGH BIT(23)
+#define TEGRA_GMI_ADV_ACTIVE_HIGH BIT(22)
+#define TEGRA_GMI_OE_ACTIVE_HIGH BIT(21)
+#define TEGRA_GMI_CS_ACTIVE_HIGH BIT(20)
+#define TEGRA_GMI_CS_SELECT(x) ((x & 0x7) << 4)
+
+#define TEGRA_GMI_TIMING0 0x10
+#define TEGRA_GMI_MUXED_WIDTH(x) ((x & 0xf) << 12)
+#define TEGRA_GMI_HOLD_WIDTH(x) ((x & 0xf) << 8)
+#define TEGRA_GMI_ADV_WIDTH(x) ((x & 0xf) << 4)
+#define TEGRA_GMI_CE_WIDTH(x) (x & 0xf)
+
+#define TEGRA_GMI_TIMING1 0x14
+#define TEGRA_GMI_WE_WIDTH(x) ((x & 0xff) << 16)
+#define TEGRA_GMI_OE_WIDTH(x) ((x & 0xff) << 8)
+#define TEGRA_GMI_WAIT_WIDTH(x) (x & 0xff)
+
+struct tegra_gmi_priv {
+ void __iomem *base;
+
+ u32 snor_config;
+ u32 snor_timing0;
+ u32 snor_timing1;
+
+ struct clk *clk;
+};
+
+static void tegra_gmi_init(struct device *dev, struct tegra_gmi_priv *priv)
+{
+ writel(priv->snor_timing0, priv->base + TEGRA_GMI_TIMING0);
+ writel(priv->snor_timing1, priv->base + TEGRA_GMI_TIMING1);
+
+ priv->snor_config |= TEGRA_GMI_CONFIG_GO;
+ writel(priv->snor_config, priv->base + TEGRA_GMI_CONFIG);
+}
+
+static int tegra_gmi_parse_dt(struct device *dev, struct tegra_gmi_priv *priv)
+{
+ struct device_node *of_node = dev->of_node;
+ u32 property;
+
+ /* configuration */
+
+ if (of_property_read_bool(of_node, "nvidia,snor-data-width-32bit"))
+ priv->snor_config |= TEGRA_GMI_BUS_WIDTH_32BIT;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-mux-mode"))
+ priv->snor_config |= TEGRA_GMI_MUX_MODE;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-rdy-active-before-data"))
+ priv->snor_config |= TEGRA_GMI_RDY_BEFORE_DATA;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-rdy-inv"))
+ priv->snor_config |= TEGRA_GMI_RDY_ACTIVE_HIGH;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-adv-inv"))
+ priv->snor_config |= TEGRA_GMI_ADV_ACTIVE_HIGH;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-oe-inv"))
+ priv->snor_config |= TEGRA_GMI_OE_ACTIVE_HIGH;
+
+ if (of_property_read_bool(of_node, "nvidia,snor-cs-inv"))
+ priv->snor_config |= TEGRA_GMI_CS_ACTIVE_HIGH;
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-cs-select", &property))
+ priv->snor_config |= TEGRA_GMI_CS_SELECT(property);
+
+ /* Timing, the default values that are provided are reset values */
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-muxed-width", &property))
+ priv->snor_timing0 |= TEGRA_GMI_MUXED_WIDTH(property);
+ else
+ priv->snor_timing0 |= TEGRA_GMI_MUXED_WIDTH(1);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-hold-width", &property))
+ priv->snor_timing0 |= TEGRA_GMI_HOLD_WIDTH(property);
+ else
+ priv->snor_timing0 |= TEGRA_GMI_HOLD_WIDTH(1);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-adv-width", &property))
+ priv->snor_timing0 |= TEGRA_GMI_ADV_WIDTH(property);
+ else
+ priv->snor_timing0 |= TEGRA_GMI_ADV_WIDTH(1);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-ce-width", &property))
+ priv->snor_timing0 |= TEGRA_GMI_CE_WIDTH(property);
+ else
+ priv->snor_timing0 |= TEGRA_GMI_CE_WIDTH(4);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-we-width", &property))
+ priv->snor_timing1 |= TEGRA_GMI_WE_WIDTH(property);
+ else
+ priv->snor_timing1 |= TEGRA_GMI_WE_WIDTH(1);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-oe-width", &property))
+ priv->snor_timing1 |= TEGRA_GMI_OE_WIDTH(property);
+ else
+ priv->snor_timing1 |= TEGRA_GMI_OE_WIDTH(1);
+
+ if (!of_property_read_u32(of_node, "nvidia,snor-wait-width", &property))
+ priv->snor_timing1 |= TEGRA_GMI_WAIT_WIDTH(property);
+ else
+ priv->snor_timing1 |= TEGRA_GMI_WAIT_WIDTH(3);
+
+ return of_platform_default_populate(of_node, NULL, dev);
+}
+
+static int tegra_gmi_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct clk *clk;
+ struct device *dev = &pdev->dev;
+ struct reset_control *rst;
+ struct tegra_gmi_priv *priv;
+ void __iomem *base;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->base = base;
+
+ clk = devm_clk_get(dev, "gmi");
+ if (IS_ERR(clk)) {
+ dev_err(dev, "can not get clock\n");
+ return PTR_ERR(clk);
+ }
+
+ priv->clk = clk;
+
+ rst = devm_reset_control_get(dev, "gmi");
+ if (IS_ERR(rst)) {
+ dev_err(dev, "can not get reset\n");
+ return PTR_ERR(rst);
+ }
+
+ ret = tegra_gmi_parse_dt(dev, priv);
+ if (ret) {
+ dev_err(dev, "fail to create devices.\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(clk);
+ if (ret) {
+ dev_err(dev, "fail to enable clock.\n");
+ return ret;
+ }
+
+ reset_control_assert(rst);
+ udelay(2);
+ reset_control_deassert(rst);
+
+ tegra_gmi_init(dev, priv);
+
+ dev_set_drvdata(dev, priv);
+
+ return 0;
+}
+
+static int tegra_gmi_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct tegra_gmi_priv *priv = dev_get_drvdata(dev);
+ void __iomem *base = priv->base;
+ u32 config;
+
+ of_platform_depopulate(dev);
+
+ config = readl(base + TEGRA_GMI_CONFIG);
+ config &= ~TEGRA_GMI_CONFIG_GO;
+ writel(config, base + TEGRA_GMI_CONFIG);
+
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_gmi_id_table[] = {
+ { .compatible = "nvidia,tegra20-gmi", },
+ { .compatible = "nvidia,tegra30-gmi", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tegra_gmi_id_table);
+
+static struct platform_driver tegra_gmi_driver = {
+ .probe = tegra_gmi_probe,
+ .remove = tegra_gmi_remove,
+ .driver = {
+ .name = "tegra-gmi",
+ .of_match_table = tegra_gmi_id_table,
+ },
+};
+module_platform_driver(tegra_gmi_driver);
+
+MODULE_AUTHOR("Mirza Krak <mirza.krak@gmail.com");
+MODULE_DESCRIPTION("NVIDIA Tegra GMI Bus Driver");
+MODULE_LICENSE("GPL v2");
--
2.1.4