2 files changed, 398 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_das.c b/sound/soc/tegra/tegra_das.c
new file mode 100644
index 000000000000..796d36d5188a
--- /dev/null
+++ b/sound/soc/tegra/tegra_das.c
@@ -0,0 +1,263 @@
+/*
+ * 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, asoc_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");
diff --git a/sound/soc/tegra/tegra_das.h b/sound/soc/tegra/tegra_das.h
new file mode 100644
index 000000000000..2c96c7b3c459
--- /dev/null
+++ b/sound/soc/tegra/tegra_das.h
@@ -0,0 +1,135 @@
+/*
+ * tegra_das.h - Definitions for 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
+ *
+ */
+
+#ifndef __TEGRA_DAS_H__
+#define __TEGRA_DAS_H__
+
+/* Register TEGRA_DAS_DAP_CTRL_SEL */
+#define TEGRA_DAS_DAP_CTRL_SEL                          0x00
+#define TEGRA_DAS_DAP_CTRL_SEL_COUNT                    5
+#define TEGRA_DAS_DAP_CTRL_SEL_STRIDE                   4
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_P             31
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_MS_SEL_S             1
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_P       30
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA1_TX_RX_S       1
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_P       29
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_SDATA2_TX_RX_S       1
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_P           0
+#define TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL_S           5
+
+/* Values for field TEGRA_DAS_DAP_CTRL_SEL_DAP_CTRL_SEL */
+#define TEGRA_DAS_DAP_SEL_DAC1  0
+#define TEGRA_DAS_DAP_SEL_DAC2  1
+#define TEGRA_DAS_DAP_SEL_DAC3  2
+#define TEGRA_DAS_DAP_SEL_DAP1  16
+#define TEGRA_DAS_DAP_SEL_DAP2  17
+#define TEGRA_DAS_DAP_SEL_DAP3  18
+#define TEGRA_DAS_DAP_SEL_DAP4  19
+#define TEGRA_DAS_DAP_SEL_DAP5  20
+
+/* Register TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL */
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL                        0x40
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_COUNT                  3
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_STRIDE                 4
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_P       28
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL_S       4
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_P       24
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL_S       4
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_P          0
+#define TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL_S          4
+
+/*
+ * Values for:
+ * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA2_SEL
+ * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_SDATA1_SEL
+ * TEGRA_DAS_DAC_INPUT_DATA_CLK_SEL_DAC_CLK_SEL
+ */
+#define TEGRA_DAS_DAC_SEL_DAP1  0
+#define TEGRA_DAS_DAC_SEL_DAP2  1
+#define TEGRA_DAS_DAC_SEL_DAP3  2
+#define TEGRA_DAS_DAC_SEL_DAP4  3
+#define TEGRA_DAS_DAC_SEL_DAP5  4
+
+/*
+ * Names/IDs of the DACs/DAPs.
+ */
+
+#define TEGRA_DAS_DAP_ID_1 0
+#define TEGRA_DAS_DAP_ID_2 1
+#define TEGRA_DAS_DAP_ID_3 2
+#define TEGRA_DAS_DAP_ID_4 3
+#define TEGRA_DAS_DAP_ID_5 4
+
+#define TEGRA_DAS_DAC_ID_1 0
+#define TEGRA_DAS_DAC_ID_2 1
+#define TEGRA_DAS_DAC_ID_3 2
+
+struct tegra_das {
+        struct device *dev;
+        void __iomem *regs;
+        struct dentry *debug;
+};
+
+/*
+ * Terminology:
+ * DAS: Digital audio switch (HW module controlled by this driver)
+ * DAP: Digital audio port (port/pins on Tegra device)
+ * DAC: Digital audio controller (e.g. I2S or AC97 controller elsewhere)
+ * 
+ * The Tegra DAS is a mux/cross-bar which can connect each DAP to a specific
+ * DAC, or another DAP. When DAPs are connected, one must be the master and
+ * one the slave. Each DAC allows selection of a specific DAP for input, to
+ * cater for the case where N DAPs are connected to 1 DAC for broadcast
+ * output.
+ *
+ * This driver is dumb; no attempt is made to ensure that a valid routing
+ * configuration is programmed.
+ */
+
+/*
+ * Connect a DAP to to a DAC
+ * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
+ * dac_sel: DAC to connect to: TEGRA_DAS_DAP_SEL_DAC*
+ */
+extern int tegra_das_connect_dap_to_dac(int dap_id, int dac_sel);
+
+/*
+ * Connect a DAP to to another DAP
+ * dap_id: DAP to connect: TEGRA_DAS_DAP_ID_*
+ * other_dap_sel: DAP to connect to: TEGRA_DAS_DAP_SEL_DAP*
+ * master: Is this DAP the master (1) or slave (0)
+ * sdata1rx: Is this DAP's SDATA1 pin RX (1) or TX (0)
+ * sdata2rx: Is this DAP's SDATA2 pin RX (1) or TX (0)
+ */
+extern int tegra_das_connect_dap_to_dap(int dap_id, int other_dap_sel,
+                                        int master, int sdata1rx,
+                                        int sdata2rx);
+
+/*
+ * Connect a DAC's input to a DAP
+ * (DAC outputs are selected by the DAP)
+ * dac_id: DAC ID to connect: TEGRA_DAS_DAC_ID_*
+ * dap_sel: DAP to receive input from: TEGRA_DAS_DAC_SEL_DAP*
+ */
+extern int tegra_das_connect_dac_to_dap(int dac_id, int dap_sel);
+
+#endif