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path: root/drivers/mfd/atmel-flexcom.c
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Diffstat (limited to 'drivers/mfd/atmel-flexcom.c')
-rw-r--r--drivers/mfd/atmel-flexcom.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
new file mode 100644
index 000000000000..e8e67be6b493
--- /dev/null
+++ b/drivers/mfd/atmel-flexcom.c
@@ -0,0 +1,104 @@
+/*
+ * Driver for Atmel Flexcom
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ *
+ * Author: Cyrille Pitchen <cyrille.pitchen@atmel.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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <dt-bindings/mfd/atmel-flexcom.h>
+
+/* I/O register offsets */
+#define FLEX_MR 0x0 /* Mode Register */
+#define FLEX_VERSION 0xfc /* Version Register */
+
+/* Mode Register bit fields */
+#define FLEX_MR_OPMODE_OFFSET (0) /* Operating Mode */
+#define FLEX_MR_OPMODE_MASK (0x3 << FLEX_MR_OPMODE_OFFSET)
+#define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \
+ FLEX_MR_OPMODE_MASK)
+
+
+static int atmel_flexcom_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct clk *clk;
+ struct resource *res;
+ void __iomem *base;
+ u32 opmode;
+ int err;
+
+ err = of_property_read_u32(np, "atmel,flexcom-mode", &opmode);
+ if (err)
+ return err;
+
+ if (opmode < ATMEL_FLEXCOM_MODE_USART ||
+ opmode > ATMEL_FLEXCOM_MODE_TWI)
+ return -EINVAL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ err = clk_prepare_enable(clk);
+ if (err)
+ return err;
+
+ /*
+ * Set the Operating Mode in the Mode Register: only the selected device
+ * is clocked. Hence, registers of the other serial devices remain
+ * inaccessible and are read as zero. Also the external I/O lines of the
+ * Flexcom are muxed to reach the selected device.
+ */
+ writel(FLEX_MR_OPMODE(opmode), base + FLEX_MR);
+
+ clk_disable_unprepare(clk);
+
+ return of_platform_populate(np, NULL, NULL, &pdev->dev);
+}
+
+static const struct of_device_id atmel_flexcom_of_match[] = {
+ { .compatible = "atmel,sama5d2-flexcom" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
+
+static struct platform_driver atmel_flexcom_driver = {
+ .probe = atmel_flexcom_probe,
+ .driver = {
+ .name = "atmel_flexcom",
+ .of_match_table = atmel_flexcom_of_match,
+ },
+};
+
+module_platform_driver(atmel_flexcom_driver);
+
+MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
+MODULE_DESCRIPTION("Atmel Flexcom MFD driver");
+MODULE_LICENSE("GPL v2");