1 files changed, 311 insertions, 0 deletions

diff --git a/sound/soc/fsl/imx-audmux.c b/sound/soc/fsl/imx-audmux.c
new file mode 100644
index 000000000000..f23700359c67
--- /dev/null
+++ b/sound/soc/fsl/imx-audmux.c
@@ -0,0 +1,311 @@
+/*
+ * 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 = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        int port = (int)file->private_data;
+        u32 pdcr, ptcr;
+
+        if (!buf)
+                return -ENOMEM;
+
+        if (!audmux_base)
+                return -ENOSYS;
+
+        if (audmux_clk)
+                clk_prepare_enable(audmux_clk);
+
+        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);
+
+        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 __init audmux_debugfs_init(void)
+{
+        int 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_PORT6_SSI_PINS_6 + 1; i++) {
+                snprintf(buf, sizeof(buf), "ssi%d", i);
+                if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
+                                         (void *)i, &audmux_debugfs_fops))
+                        pr_warning("Failed to create AUDMUX port %d debugfs file\n",
+                                   i);
+        }
+}
+
+static void __devexit 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
+
+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)
+{
+        if (audmux_type != IMX31_AUDMUX)
+                return -EINVAL;
+
+        if (!audmux_base)
+                return -ENOSYS;
+
+        if (audmux_clk)
+                clk_prepare_enable(audmux_clk);
+
+        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 __devinit 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_request_and_ioremap(&pdev->dev, res);
+        if (!audmux_base)
+                return -EADDRNOTAVAIL;
+
+        audmux_clk = 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();
+
+        return 0;
+}
+
+static int __devexit imx_audmux_remove(struct platform_device *pdev)
+{
+        if (audmux_type == IMX31_AUDMUX)
+                audmux_debugfs_remove();
+        clk_put(audmux_clk);
+
+        return 0;
+}
+
+static struct platform_driver imx_audmux_driver = {
+        .probe          = imx_audmux_probe,
+        .remove         = __devexit_p(imx_audmux_remove),
+        .id_table       = imx_audmux_ids,
+        .driver = {
+                .name   = DRIVER_NAME,
+                .owner  = THIS_MODULE,
+                .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);