387 lines
8.6 KiB
C
387 lines
8.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright 2012 Freescale Semiconductor, Inc.
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// Copyright 2012 Linaro Ltd.
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// Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
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//
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// Initial development of this code was funded by
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// Phytec Messtechnik GmbH, https://www.phytec.de
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "imx-audmux.h"
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#define DRIVER_NAME "imx-audmux"
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static struct clk *audmux_clk;
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static void __iomem *audmux_base;
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static u32 *regcache;
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static u32 reg_max;
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#define IMX_AUDMUX_V2_PTCR(x) ((x) * 8)
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#define IMX_AUDMUX_V2_PDCR(x) ((x) * 8 + 4)
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#ifdef CONFIG_DEBUG_FS
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static struct dentry *audmux_debugfs_root;
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/* There is an annoying discontinuity in the SSI numbering with regard
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* to the Linux number of the devices */
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static const char *audmux_port_string(int port)
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{
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switch (port) {
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case MX31_AUDMUX_PORT1_SSI0:
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return "imx-ssi.0";
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case MX31_AUDMUX_PORT2_SSI1:
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return "imx-ssi.1";
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case MX31_AUDMUX_PORT3_SSI_PINS_3:
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return "SSI3";
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case MX31_AUDMUX_PORT4_SSI_PINS_4:
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return "SSI4";
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case MX31_AUDMUX_PORT5_SSI_PINS_5:
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return "SSI5";
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case MX31_AUDMUX_PORT6_SSI_PINS_6:
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return "SSI6";
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default:
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return "UNKNOWN";
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}
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}
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static ssize_t audmux_read_file(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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char *buf;
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uintptr_t port = (uintptr_t)file->private_data;
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u32 pdcr, ptcr;
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ret = clk_prepare_enable(audmux_clk);
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if (ret)
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return ret;
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ptcr = readl(audmux_base + IMX_AUDMUX_V2_PTCR(port));
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pdcr = readl(audmux_base + IMX_AUDMUX_V2_PDCR(port));
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clk_disable_unprepare(audmux_clk);
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buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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ret = scnprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
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pdcr, ptcr);
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if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"TxFS output from %s, ",
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audmux_port_string((ptcr >> 27) & 0x7));
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else
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"TxFS input, ");
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if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"TxClk output from %s",
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audmux_port_string((ptcr >> 22) & 0x7));
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else
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"TxClk input");
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ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
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if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"Port is symmetric");
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} else {
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if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"RxFS output from %s, ",
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audmux_port_string((ptcr >> 17) & 0x7));
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else
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"RxFS input, ");
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if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"RxClk output from %s",
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audmux_port_string((ptcr >> 12) & 0x7));
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else
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"RxClk input");
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}
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ret += scnprintf(buf + ret, PAGE_SIZE - ret,
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"\nData received from %s\n",
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audmux_port_string((pdcr >> 13) & 0x7));
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ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
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kfree(buf);
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return ret;
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}
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static const struct file_operations audmux_debugfs_fops = {
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.open = simple_open,
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.read = audmux_read_file,
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.llseek = default_llseek,
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};
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static void audmux_debugfs_init(void)
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{
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uintptr_t i;
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char buf[20];
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audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
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for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
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snprintf(buf, sizeof(buf), "ssi%lu", i);
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debugfs_create_file(buf, 0444, audmux_debugfs_root,
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(void *)i, &audmux_debugfs_fops);
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}
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}
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static void audmux_debugfs_remove(void)
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{
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debugfs_remove_recursive(audmux_debugfs_root);
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}
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#else
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static inline void audmux_debugfs_init(void)
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{
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}
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static inline void audmux_debugfs_remove(void)
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{
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}
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#endif
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static enum imx_audmux_type {
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IMX21_AUDMUX,
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IMX31_AUDMUX,
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} audmux_type;
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static const struct of_device_id imx_audmux_dt_ids[] = {
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{ .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, },
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{ .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_audmux_dt_ids);
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static const uint8_t port_mapping[] = {
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0x0, 0x4, 0x8, 0x10, 0x14, 0x1c,
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};
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int imx_audmux_v1_configure_port(unsigned int port, unsigned int pcr)
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{
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if (audmux_type != IMX21_AUDMUX)
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return -EINVAL;
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if (!audmux_base)
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return -ENOSYS;
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if (port >= ARRAY_SIZE(port_mapping))
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return -EINVAL;
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writel(pcr, audmux_base + port_mapping[port]);
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_audmux_v1_configure_port);
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int imx_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
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unsigned int pdcr)
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{
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int ret;
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if (audmux_type != IMX31_AUDMUX)
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return -EINVAL;
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if (!audmux_base)
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return -ENOSYS;
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ret = clk_prepare_enable(audmux_clk);
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if (ret)
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return ret;
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writel(ptcr, audmux_base + IMX_AUDMUX_V2_PTCR(port));
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writel(pdcr, audmux_base + IMX_AUDMUX_V2_PDCR(port));
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clk_disable_unprepare(audmux_clk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_audmux_v2_configure_port);
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static int imx_audmux_parse_dt_defaults(struct platform_device *pdev,
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struct device_node *of_node)
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{
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struct device_node *child;
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for_each_available_child_of_node(of_node, child) {
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unsigned int port;
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unsigned int ptcr = 0;
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unsigned int pdcr = 0;
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unsigned int pcr = 0;
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unsigned int val;
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int ret;
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int i = 0;
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ret = of_property_read_u32(child, "fsl,audmux-port", &port);
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if (ret) {
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dev_warn(&pdev->dev, "Failed to get fsl,audmux-port of child node \"%pOF\"\n",
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child);
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continue;
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}
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if (!of_property_read_bool(child, "fsl,port-config")) {
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dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
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child);
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continue;
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}
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for (i = 0; (ret = of_property_read_u32_index(child,
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"fsl,port-config", i, &val)) == 0;
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++i) {
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if (audmux_type == IMX31_AUDMUX) {
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if (i % 2)
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pdcr |= val;
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else
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ptcr |= val;
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} else {
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pcr |= val;
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}
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}
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if (ret != -EOVERFLOW) {
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dev_err(&pdev->dev, "Failed to read u32 at index %d of child %pOF\n",
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i, child);
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continue;
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}
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if (audmux_type == IMX31_AUDMUX) {
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if (i % 2) {
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dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
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child);
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continue;
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}
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imx_audmux_v2_configure_port(port, ptcr, pdcr);
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} else {
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imx_audmux_v1_configure_port(port, pcr);
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}
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}
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return 0;
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}
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static int imx_audmux_probe(struct platform_device *pdev)
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{
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audmux_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(audmux_base))
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return PTR_ERR(audmux_base);
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audmux_clk = devm_clk_get(&pdev->dev, "audmux");
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if (IS_ERR(audmux_clk)) {
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dev_dbg(&pdev->dev, "cannot get clock: %ld\n",
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PTR_ERR(audmux_clk));
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audmux_clk = NULL;
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}
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audmux_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
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switch (audmux_type) {
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case IMX31_AUDMUX:
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audmux_debugfs_init();
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reg_max = 14;
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break;
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case IMX21_AUDMUX:
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reg_max = 6;
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break;
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default:
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dev_err(&pdev->dev, "unsupported version!\n");
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return -EINVAL;
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}
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regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL);
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if (!regcache)
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return -ENOMEM;
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imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
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return 0;
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}
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static int imx_audmux_remove(struct platform_device *pdev)
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{
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if (audmux_type == IMX31_AUDMUX)
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audmux_debugfs_remove();
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int imx_audmux_suspend(struct device *dev)
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{
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int i;
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clk_prepare_enable(audmux_clk);
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for (i = 0; i < reg_max; i++)
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regcache[i] = readl(audmux_base + i * 4);
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clk_disable_unprepare(audmux_clk);
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return 0;
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}
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static int imx_audmux_resume(struct device *dev)
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{
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int i;
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clk_prepare_enable(audmux_clk);
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for (i = 0; i < reg_max; i++)
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writel(regcache[i], audmux_base + i * 4);
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clk_disable_unprepare(audmux_clk);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static const struct dev_pm_ops imx_audmux_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
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};
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static struct platform_driver imx_audmux_driver = {
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.probe = imx_audmux_probe,
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.remove = imx_audmux_remove,
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.driver = {
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.name = DRIVER_NAME,
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.pm = &imx_audmux_pm,
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.of_match_table = imx_audmux_dt_ids,
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}
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};
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static int __init imx_audmux_init(void)
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{
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return platform_driver_register(&imx_audmux_driver);
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}
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subsys_initcall(imx_audmux_init);
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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);
|