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audmux-v2.c

/*
 * 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/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <mach/audmux.h>
#include <mach/hardware.h>

static struct clk *audmux_clk;
static void __iomem *audmux_base;

#define MXC_AUDMUX_V2_PTCR(x)       ((x) * 8)
#define MXC_AUDMUX_V2_PDCR(x)       ((x) * 8 + 4)

#ifdef CONFIG_DEBUG_FS
static struct dentry *audmux_debugfs_root;

static int audmux_open_file(struct inode *inode, struct file *file)
{
      file->private_data = inode->i_private;
      return 0;
}

/* 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_clk)
            clk_enable(audmux_clk);

      ptcr = readl(audmux_base + MXC_AUDMUX_V2_PTCR(port));
      pdcr = readl(audmux_base + MXC_AUDMUX_V2_PDCR(port));

      if (audmux_clk)
            clk_disable(audmux_clk);

      ret = snprintf(buf, PAGE_SIZE, "PDCR: %08x\nPTCR: %08x\n",
                   pdcr, ptcr);

      if (ptcr & MXC_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 & MXC_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 & MXC_AUDMUX_V2_PTCR_SYN) {
            ret += snprintf(buf + ret, PAGE_SIZE - ret,
                        "Port is symmetric");
      } else {
            if (ptcr & MXC_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 & MXC_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 = audmux_open_file,
      .read = audmux_read_file,
      .llseek = default_llseek,
};

static void 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 = 1; i < 8; 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);
      }
}
#else
static inline void audmux_debugfs_init(void)
{
}
#endif

int mxc_audmux_v2_configure_port(unsigned int port, unsigned int ptcr,
            unsigned int pdcr)
{
      if (!audmux_base)
            return -ENOSYS;

      if (audmux_clk)
            clk_enable(audmux_clk);

      writel(ptcr, audmux_base + MXC_AUDMUX_V2_PTCR(port));
      writel(pdcr, audmux_base + MXC_AUDMUX_V2_PDCR(port));

      if (audmux_clk)
            clk_disable(audmux_clk);

      return 0;
}
EXPORT_SYMBOL_GPL(mxc_audmux_v2_configure_port);

static int mxc_audmux_v2_init(void)
{
      int ret;
#if defined(CONFIG_ARCH_MX5)
      if (cpu_is_mx51()) {
            audmux_base = MX51_IO_ADDRESS(MX51_AUDMUX_BASE_ADDR);
            ret = 0;
            return ret;
      }
#endif
#if defined(CONFIG_ARCH_MX3)
      if (cpu_is_mx31())
            audmux_base = MX31_IO_ADDRESS(MX31_AUDMUX_BASE_ADDR);

      else if (cpu_is_mx35()) {
            audmux_clk = clk_get(NULL, "audmux");
            if (IS_ERR(audmux_clk)) {
                  ret = PTR_ERR(audmux_clk);
                  printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
                              ret);
                  return ret;
            }
            audmux_base = MX35_IO_ADDRESS(MX35_AUDMUX_BASE_ADDR);
      }
#endif
#if defined(CONFIG_SOC_IMX25)
      if (cpu_is_mx25()) {
            audmux_clk = clk_get(NULL, "audmux");
            if (IS_ERR(audmux_clk)) {
                  ret = PTR_ERR(audmux_clk);
                  printk(KERN_ERR "%s: cannot get clock: %d\n", __func__,
                              ret);
                  return ret;
            }
            audmux_base = MX25_IO_ADDRESS(MX25_AUDMUX_BASE_ADDR);
      }
#endif /* if defined(CONFIG_SOC_IMX25) */
      audmux_debugfs_init();

      return 0;
}

postcore_initcall(mxc_audmux_v2_init);

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