--- /dev/null
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * Initial development of this code was funded by
+ * Phytec Messtechnik GmbH, http://www.phytec.de
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "imx-audmux.h"
+
+#define DRIVER_NAME "imx-audmux"
+
+static struct clk *audmux_clk;
+static void __iomem *audmux_base;
+
+#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
+#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
+
+#ifdef CONFIG_DEBUG_FS
+static struct dentry *audmux_debugfs_root;
+
+/* There is an annoying discontinuity in the SSI numbering with regard
+ * to the Linux number of the devices */
+static const char *audmux_port_string(int port)
+{
+ switch (port) {
+ case MX31_AUDMUX_PORT1_SSI0:
+ return "imx-ssi.0";
+ case MX31_AUDMUX_PORT2_SSI1:
+ return "imx-ssi.1";
+ case MX31_AUDMUX_PORT3_SSI_PINS_3:
+ return "SSI3";
+ case MX31_AUDMUX_PORT4_SSI_PINS_4:
+ return "SSI4";
+ case MX31_AUDMUX_PORT5_SSI_PINS_5:
+ return "SSI5";
+ case MX31_AUDMUX_PORT6_SSI_PINS_6:
+ return "SSI6";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t ret;
+ char *buf;
+ uintptr_t port = (uintptr_t)file->private_data;
+ u32 pdcr, ptcr;
+
+ if (audmux_clk) {
+ ret = clk_prepare_enable(audmux_clk);
+ if (ret)
+ return ret;
+ }
+
+ ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
+ pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
+
+ if (audmux_clk)
+ clk_disable_unprepare(audmux_clk);
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
+ pdcr, ptcr);
+
+ if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxFS output from %s, ",
+ audmux_port_string((ptcr >> 27) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxFS input, ");
+
+ if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxClk output from %s",
+ audmux_port_string((ptcr >> 22) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "TxClk input");
+
+ ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
+
+ if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "Port is symmetric");
+ } else {
+ if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxFS output from %s, ",
+ audmux_port_string((ptcr >> 17) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxFS input, ");
+
+ if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxClk output from %s",
+ audmux_port_string((ptcr >> 12) & 0x7));
+ else
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "RxClk input");
+ }
+
+ ret += snprintf(buf + ret, PAGE_SIZE - ret,
+ "\nData received from %s\n",
+ audmux_port_string((pdcr >> 13) & 0x7));
+
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+
+ return ret;
+}
+
+static const struct file_operations audmux_debugfs_fops = {
+ .open = simple_open,
+ .read = audmux_read_file,
+ .llseek = default_llseek,
+};
+
+static void audmux_debugfs_init(void)
+{
+ uintptr_t i;
+ char buf[20];
+
+ audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
+ if (!audmux_debugfs_root) {
+ pr_warning("Failed to create AUDMUX debugfs root\n");
+ return;
+ }
+
+ for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
+ snprintf(buf, sizeof(buf), "ssi%lu", i);
+ if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
+ (void *)i, &audmux_debugfs_fops))
+ pr_warning("Failed to create AUDMUX port %lu debugfs file\n",
+ i);
+ }
+}
+
+static void audmux_debugfs_remove(void)
+{
+ debugfs_remove_recursive(audmux_debugfs_root);
+}
+#else
+static inline void audmux_debugfs_init(void)
+{
+}
+
+static inline void audmux_debugfs_remove(void)
+{
+}
+#endif
+
+static enum imx_audmux_type {
+ IMX21_AUDMUX,
+ IMX31_AUDMUX,
+} audmux_type;
+
+static struct platform_device_id imx_audmux_ids[] = {
+ {
+ .name = "imx21-audmux",
+ .driver_data = IMX21_AUDMUX,
+ }, {
+ .name = "imx31-audmux",
+ .driver_data = IMX31_AUDMUX,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(platform, imx_audmux_ids);
+
+static const struct of_device_id imx_audmux_dt_ids[] = {
+ { .compatible = "fsl,imx21-audmux", .data = &imx_audmux_ids[0], },
+ { .compatible = "fsl,imx31-audmux", .data = &imx_audmux_ids[1], },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
+
+static const uint8_t port_mapping[] = {
+ 0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
+};
+
+int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
+{
+ if (audmux_type != IMX21_AUDMUX)
+ return -EINVAL;
+
+ if (!audmux_base)
+ return -ENOSYS;
+
+ if (port >= ARRAY_SIZE(port_mapping))
+ return -EINVAL;
+
+ writel(pcr, audmux_base + port_mapping[port]);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
+
+int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
+ unsigned int pdcr)
+{
+ int ret;
+
+ if (audmux_type != IMX31_AUDMUX)
+ return -EINVAL;
+
+ if (!audmux_base)
+ return -ENOSYS;
+
+ if (audmux_clk) {
+ ret = clk_prepare_enable(audmux_clk);
+ if (ret)
+ return ret;
+ }
+
+ writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
+ writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
+
+ if (audmux_clk)
+ clk_disable_unprepare(audmux_clk);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
+
+static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
+ struct device_node *of_node)
+{
+ struct device_node *child;
+
+ for_each_available_child_of_node(of_node, child) {
+ unsigned int port;
+ unsigned int ptcr = 0;
+ unsigned int pdcr = 0;
+ unsigned int pcr = 0;
+ unsigned int val;
+ int ret;
+ int i = 0;
+
+ ret = of_property_read_u32(child, "fsl,audmux-port", &port);
+ if (ret) {
+ dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%s\"\n",
+ child->full_name);
+ continue;
+ }
+ if (!of_property_read_bool(child, "fsl,port-config")) {
+ dev_warn(&pdev->dev, "child node \"%s\" does not have property fsl,port-config\n",
+ child->full_name);
+ continue;
+ }
+
+ for (i = 0; (ret = of_property_read_u32_index(child,
+ "fsl,port-config", i, &val)) == 0;
+ ++i) {
+ if (audmux_type == IMX31_AUDMUX) {
+ if (i % 2)
+ pdcr |= val;
+ else
+ ptcr |= val;
+ } else {
+ pcr |= val;
+ }
+ }
+
+ if (ret != -EOVERFLOW) {
+ dev_err(&pdev->dev, "Failed to read u32 at index %d of child %s\n",
+ i, child->full_name);
+ continue;
+ }
+
+ if (audmux_type == IMX31_AUDMUX) {
+ if (i % 2) {
+ dev_err(&pdev->dev, "One pdcr value is missing in child node %s\n",
+ child->full_name);
+ continue;
+ }
+ imx_audmux_v2_configure_port(port, ptcr, pdcr);
+ } else {
+ imx_audmux_v1_configure_port(port, pcr);
+ }
+ }
+
+ return 0;
+}
+
+static int imx_audmux_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ const struct of_device_id *of_id =
+ of_match_device(imx_audmux_dt_ids, &pdev->dev);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ audmux_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(audmux_base))
+ return PTR_ERR(audmux_base);
+
+ audmux_clk = devm_clk_get(&pdev->dev, "audmux");
+ if (IS_ERR(audmux_clk)) {
+ dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
+ PTR_ERR(audmux_clk));
+ audmux_clk = NULL;
+ }
+
+ if (of_id)
+ pdev->id_entry = of_id->data;
+ audmux_type = pdev->id_entry->driver_data;
+ if (audmux_type == IMX31_AUDMUX)
+ audmux_debugfs_init();
+
+ if (of_id)
+ imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
+
+ return 0;
+}
+
+static int imx_audmux_remove(struct platform_device *pdev)
+{
+ if (audmux_type == IMX31_AUDMUX)
+ audmux_debugfs_remove();
+
+ return 0;
+}
+
+static struct platform_driver imx_audmux_driver = {
+ .probe = imx_audmux_probe,
+ .remove = imx_audmux_remove,
+ .id_table = imx_audmux_ids,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = imx_audmux_dt_ids,
+ }
+};
+
+static int __init imx_audmux_init(void)
+{
+ return platform_driver_register(&imx_audmux_driver);
+}
+subsys_initcall(imx_audmux_init);
+
+static void __exit imx_audmux_exit(void)
+{
+ platform_driver_unregister(&imx_audmux_driver);
+}
+module_exit(imx_audmux_exit);
+
+MODULE_DESCRIPTION("Freescale i.MX AUDMUX driver");
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
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