// SPDX-License-Identifier: GPL-2.0+
//
// Copyright 2012 Freescale Semiconductor, Inc.
// Copyright 2012 Linaro Ltd.
// Copyright 2009 Pengutronix, Sascha Hauer <[email protected]>
//
// Initial development of this code was funded by
// Phytec Messtechnik GmbH, https://www.phytec.de
#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/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;
static u32 *regcache;
static u32 reg_max;
#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;
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));
clk_disable_unprepare(audmux_clk);
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = sysfs_emit(buf, "PDCR: %08x\nPTCR: %08x\n", pdcr, ptcr);
if (ptcr & IMX_AUDMUX_V2_PTCR_TFSDIR)
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"TxFS output from %s, ",
audmux_port_string((ptcr >> 27) & 0x7));
else
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"TxFS input, ");
if (ptcr & IMX_AUDMUX_V2_PTCR_TCLKDIR)
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"TxClk output from %s",
audmux_port_string((ptcr >> 22) & 0x7));
else
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"TxClk input");
ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
if (ptcr & IMX_AUDMUX_V2_PTCR_SYN) {
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"Port is symmetric");
} else {
if (ptcr & IMX_AUDMUX_V2_PTCR_RFSDIR)
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"RxFS output from %s, ",
audmux_port_string((ptcr >> 17) & 0x7));
else
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"RxFS input, ");
if (ptcr & IMX_AUDMUX_V2_PTCR_RCLKDIR)
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"RxClk output from %s",
audmux_port_string((ptcr >> 12) & 0x7));
else
ret += scnprintf(buf + ret, PAGE_SIZE - ret,
"RxClk input");
}
ret += scnprintf(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);
for (i = 0; i < MX31_AUDMUX_PORT7_SSI_PINS_7 + 1; i++) {
snprintf(buf, sizeof(buf), "ssi%lu", i);
debugfs_create_file(buf, 0444, audmux_debugfs_root,
(void *)i, &audmux_debugfs_fops);
}
}
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 const struct of_device_id imx_audmux_dt_ids[] = {
{ .compatible = "fsl,imx21-audmux", .data = (void *)IMX21_AUDMUX, },
{ .compatible = "fsl,imx31-audmux", .data = (void *)IMX31_AUDMUX, },
{ /* 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;
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));
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 \"%pOF\"\n",
child);
continue;
}
if (!of_property_read_bool(child, "fsl,port-config")) {
dev_warn(&pdev->dev, "child node \"%pOF\" does not have property fsl,port-config\n",
child);
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 %pOF\n",
i, child);
continue;
}
if (audmux_type == IMX31_AUDMUX) {
if (i % 2) {
dev_err(&pdev->dev, "One pdcr value is missing in child node %pOF\n",
child);
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)
{
audmux_base = devm_platform_ioremap_resource(pdev, 0);
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;
}
audmux_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
switch (audmux_type) {
case IMX31_AUDMUX:
audmux_debugfs_init();
reg_max = 14;
break;
case IMX21_AUDMUX:
reg_max = 6;
break;
default:
dev_err(&pdev->dev, "unsupported version!\n");
return -EINVAL;
}
regcache = devm_kzalloc(&pdev->dev, sizeof(u32) * reg_max, GFP_KERNEL);
if (!regcache)
return -ENOMEM;
imx_audmux_parse_dt_defaults(pdev, pdev->dev.of_node);
return 0;
}
static void imx_audmux_remove(struct platform_device *pdev)
{
if (audmux_type == IMX31_AUDMUX)
audmux_debugfs_remove();
}
static int imx_audmux_suspend(struct device *dev)
{
int i;
clk_prepare_enable(audmux_clk);
for (i = 0; i < reg_max; i++)
regcache[i] = readl(audmux_base + i * 4);
clk_disable_unprepare(audmux_clk);
return 0;
}
static int imx_audmux_resume(struct device *dev)
{
int i;
clk_prepare_enable(audmux_clk);
for (i = 0; i < reg_max; i++)
writel(regcache[i], audmux_base + i * 4);
clk_disable_unprepare(audmux_clk);
return 0;
}
static const struct dev_pm_ops imx_audmux_pm = {
SYSTEM_SLEEP_PM_OPS(imx_audmux_suspend, imx_audmux_resume)
};
static struct platform_driver imx_audmux_driver = {
.probe = imx_audmux_probe,
.remove = imx_audmux_remove,
.driver = {
.name = DRIVER_NAME,
.pm = pm_sleep_ptr(&imx_audmux_pm),
.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 <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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