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![Sascha Hauer](/assets/img/avatar_default.png)
These were present to be able to compile this file on different SoCs. They are not needed anymore. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
219 lines
5.4 KiB
C
219 lines
5.4 KiB
C
/*
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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, http://www.phytec.de
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <mach/audmux.h>
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#include <mach/hardware.h>
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static struct clk *audmux_clk;
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static void __iomem *audmux_base;
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#define MXC_AUDMUX_V2_PTCR(x) ((x) * 8)
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#define MXC_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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static int audmux_open_file(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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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 = kmalloc(PAGE_SIZE, GFP_KERNEL);
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int port = (int)file->private_data;
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u32 pdcr, ptcr;
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if (!buf)
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return -ENOMEM;
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if (audmux_clk)
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clk_enable(audmux_clk);
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ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
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pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));
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if (audmux_clk)
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clk_disable(audmux_clk);
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ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
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pdcr, ptcr);
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if (ptcr & MXC_AUDMUX_V2_PTCR_TFSDIR)
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ret += snprintf(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 += snprintf(buf + ret, PAGE_SIZE - ret,
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"TxFS input, ");
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if (ptcr & MXC_AUDMUX_V2_PTCR_TCLKDIR)
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ret += snprintf(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 += snprintf(buf + ret, PAGE_SIZE - ret,
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"TxClk input");
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ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
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if (ptcr & MXC_AUDMUX_V2_PTCR_SYN) {
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ret += snprintf(buf + ret, PAGE_SIZE - ret,
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"Port is symmetric");
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} else {
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if (ptcr & MXC_AUDMUX_V2_PTCR_RFSDIR)
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ret += snprintf(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 += snprintf(buf + ret, PAGE_SIZE - ret,
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"RxFS input, ");
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if (ptcr & MXC_AUDMUX_V2_PTCR_RCLKDIR)
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ret += snprintf(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 += snprintf(buf + ret, PAGE_SIZE - ret,
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"RxClk input");
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}
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ret += snprintf(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 = audmux_open_file,
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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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int i;
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char buf[20];
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audmux_debugfs_root = debugfs_create_dir("audmux", NULL);
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if (!audmux_debugfs_root) {
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pr_warning("Failed to create AUDMUX debugfs root\n");
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return;
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}
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for (i = 1; i < 8; i++) {
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snprintf(buf, sizeof(buf), "ssi%d", i);
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if (!debugfs_create_file(buf, 0444, audmux_debugfs_root,
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(void *)i, &audmux_debugfs_fops))
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pr_warning("Failed to create AUDMUX port %d debugfs file\n",
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i);
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}
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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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#endif
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int mxc_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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if (!audmux_base)
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return -ENOSYS;
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if (audmux_clk)
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clk_enable(audmux_clk);
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writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
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writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));
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if (audmux_clk)
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clk_disable(audmux_clk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);
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static int mxc_audmux_v2_init(void)
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{
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int ret;
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if (cpu_is_mx51()) {
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audmux_base = MX51_IO_ADDRESS(MX51_AUDMUX_BASE_ADDR);
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} else if (cpu_is_mx31()) {
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audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);
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} else if (cpu_is_mx35()) {
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audmux_clk = clk_get(NULL, "audmux");
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if (IS_ERR(audmux_clk)) {
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ret = PTR_ERR(audmux_clk);
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printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
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ret);
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return ret;
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}
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audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
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} else if (cpu_is_mx25()) {
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audmux_clk = clk_get(NULL, "audmux");
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if (IS_ERR(audmux_clk)) {
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ret = PTR_ERR(audmux_clk);
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printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
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ret);
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return ret;
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}
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audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
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}
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audmux_debugfs_init();
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return 0;
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}
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postcore_initcall(mxc_audmux_v2_init);
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