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tegra_das.c

/*
 * tegra_das.c - Tegra DAS driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <mach/iomap.h>
#include <sound/soc.h>
#include "tegra_das.h"

#define DRV_NAME "tegra-das"

static struct tegra_das *das;

static inline void tegra_das_write(u32 reg, u32 val)
{
      __raw_writel(val, das->regs + reg);
}

static inline u32 tegra_das_read(u32 reg)
{
      return __raw_readl(das->regs + reg);
}

int tegra_das_connect_dap_to_dac(int dap, int dac)
{
      u32 addr;
      u32 reg;

      if (!das)
            return -ENODEV;

      addr = TEGRA_DAS_DAP_CTRL_SEL +
            (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
      reg = dac << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P;

      tegra_das_write(addr, reg);

      return 0;
}
EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dac);

int tegra_das_connect_dap_to_dap(int dap, int otherdap, int master,
                              int sdata1rx, int sdata2rx)
{
      u32 addr;
      u32 reg;

      if (!das)
            return -ENODEV;

      addr = TEGRA_DAS_DAP_CTRL_SEL +
            (dap * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
      reg = otherdap << TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P |
            !!sdata2rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P |
            !!sdata1rx << TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P |
            !!master << TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P;

      tegra_das_write(addr, reg);

      return 0;
}
EXPORT_SYMBOL_GPL(tegra_das_connect_dap_to_dap);

int tegra_das_connect_dac_to_dap(int dac, int dap)
{
      u32 addr;
      u32 reg;

      if (!das)
            return -ENODEV;

      addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL +
            (dac * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
      reg = dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P |
            dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P |
            dap << TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P;

      tegra_das_write(addr, reg);

      return 0;
}
EXPORT_SYMBOL_GPL(tegra_das_connect_dac_to_dap);

#ifdef CONFIG_DEBUG_FS
static int tegra_das_show(struct seq_file *s, void *unused)
{
      int i;
      u32 addr;
      u32 reg;

      for (i = 0; i < TEGRA_DAS_DAP_CTRL_SEL_COUNT; i++) {
            addr = TEGRA_DAS_DAP_CTRL_SEL +
                  (i * TEGRA_DAS_DAP_CTRL_SEL_STRIDE);
            reg = tegra_das_read(addr);
            seq_printf(s, "TEGRA_DAS_DAP_CTRL_SEL[%d] = %08x\n", i, reg);
      }

      for (i = 0; i < TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT; i++) {
            addr = TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL +
                  (i * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE);
            reg = tegra_das_read(addr);
            seq_printf(s, "TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL[%d] = %08x\n",
                         i, reg);
      }

      return 0;
}

static int tegra_das_debug_open(struct inode *inode, struct file *file)
{
      return single_open(file, tegra_das_show, inode->i_private);
}

static const struct file_operations tegra_das_debug_fops = {
      .open    = tegra_das_debug_open,
      .read    = seq_read,
      .llseek  = seq_lseek,
      .release = single_release,
};

static void tegra_das_debug_add(struct tegra_das *das)
{
      das->debug = debugfs_create_file(DRV_NAME, S_IRUGO,
                               snd_soc_debugfs_root, das,
                               &tegra_das_debug_fops);
}

static void tegra_das_debug_remove(struct tegra_das *das)
{
      if (das->debug)
            debugfs_remove(das->debug);
}
#else
static inline void tegra_das_debug_add(struct tegra_das *das)
{
}

static inline void tegra_das_debug_remove(struct tegra_das *das)
{
}
#endif

static int __devinit tegra_das_probe(struct platform_device *pdev)
{
      struct resource *res, *region;
      int ret = 0;

      if (das)
            return -ENODEV;

      das = kzalloc(sizeof(struct tegra_das), GFP_KERNEL);
      if (!das) {
            dev_err(&pdev->dev, "Can't allocate tegra_das\n");
            ret = -ENOMEM;
            goto exit;
      }
      das->dev = &pdev->dev;

      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      if (!res) {
            dev_err(&pdev->dev, "No memory resource\n");
            ret = -ENODEV;
            goto err_free;
      }

      region = request_mem_region(res->start, resource_size(res),
                              pdev->name);
      if (!region) {
            dev_err(&pdev->dev, "Memory region already claimed\n");
            ret = -EBUSY;
            goto err_free;
      }

      das->regs = ioremap(res->start, resource_size(res));
      if (!das->regs) {
            dev_err(&pdev->dev, "ioremap failed\n");
            ret = -ENOMEM;
            goto err_release;
      }

      tegra_das_debug_add(das);

      platform_set_drvdata(pdev, das);

      return 0;

err_release:
      release_mem_region(res->start, resource_size(res));
err_free:
      kfree(das);
      das = 0;
exit:
      return ret;
}

static int __devexit tegra_das_remove(struct platform_device *pdev)
{
      struct resource *res;

      if (!das)
            return -ENODEV;

      platform_set_drvdata(pdev, NULL);

      tegra_das_debug_remove(das);

      iounmap(das->regs);

      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      release_mem_region(res->start, resource_size(res));

      kfree(das);
      das = 0;

      return 0;
}

static struct platform_driver tegra_das_driver = {
      .probe = tegra_das_probe,
      .remove = __devexit_p(tegra_das_remove),
      .driver = {
            .name = DRV_NAME,
      },
};

static int __init tegra_das_modinit(void)
{
      return platform_driver_register(&tegra_das_driver);
}
module_init(tegra_das_modinit);

static void __exit tegra_das_modexit(void)
{
      platform_driver_unregister(&tegra_das_driver);
}
module_exit(tegra_das_modexit);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra DAS driver");
MODULE_LICENSE("GPL");

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