MFD: DaVinci Voice Codec

This is the MFD driver for the DaVinci Voice codec, it has two clients:

* Voice codec interface
* Voice codec CQ93VC

Signed-off-by: Miguel Aguilar <miguel.aguilar@ridgerun.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 194 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 951fa9b93fbe..20e322912a59 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -53,6 +53,10 @@ config MFD_SH_MOBILE_SDHI
           This driver supports the SDHI hardware block found in many
           SuperH Mobile SoCs.
 
+config MFD_DAVINCI_VOICECODEC
+        tristate
+        select MFD_CORE
+
 config MFD_DM355EVM_MSP
         bool "DaVinci DM355 EVM microcontroller"
         depends on I2C && MACH_DAVINCI_DM355_EVM
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 22715add99a7..4fbf8f89a49b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_HTC_EGPIO)		+= htc-egpio.o
 obj-$(CONFIG_HTC_PASIC3)        += htc-pasic3.o
 obj-$(CONFIG_HTC_I2CPLD)        += htc-i2cpld.o
 
+obj-$(CONFIG_MFD_DAVINCI_VOICECODEC)    += davinci_voicecodec.o
 obj-$(CONFIG_MFD_DM355EVM_MSP)  += dm355evm_msp.o
 
 obj-$(CONFIG_MFD_T7L66XB)       += t7l66xb.o tmio_core.o
diff --git a/drivers/mfd/davinci_voicecodec.c b/drivers/mfd/davinci_voicecodec.c
new file mode 100644
index 000000000000..9886aa8de250
--- /dev/null
+++ b/drivers/mfd/davinci_voicecodec.c
@@ -0,0 +1,189 @@
+/*
+ * DaVinci Voice Codec Core Interface for TI platforms
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc
+ *
+ * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <sound/pcm.h>
+
+#include <linux/mfd/davinci_voicecodec.h>
+
+u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
+{
+        return __raw_readl(davinci_vc->base + reg);
+}
+
+void davinci_vc_write(struct davinci_vc *davinci_vc,
+                                           int reg, u32 val)
+{
+        __raw_writel(val, davinci_vc->base + reg);
+}
+
+static int __init davinci_vc_probe(struct platform_device *pdev)
+{
+        struct davinci_vc *davinci_vc;
+        struct resource *res, *mem;
+        struct mfd_cell *cell = NULL;
+        int ret;
+
+        davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL);
+        if (!davinci_vc) {
+                dev_dbg(&pdev->dev,
+                            "could not allocate memory for private data\n");
+                return -ENOMEM;
+        }
+
+        davinci_vc->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(davinci_vc->clk)) {
+                dev_dbg(&pdev->dev,
+                            "could not get the clock for voice codec\n");
+                ret = -ENODEV;
+                goto fail1;
+        }
+        clk_enable(davinci_vc->clk);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "no mem resource\n");
+                ret = -ENODEV;
+                goto fail2;
+        }
+
+        davinci_vc->pbase = res->start;
+        davinci_vc->base_size = resource_size(res);
+
+        mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size,
+                                 pdev->name);
+        if (!mem) {
+                dev_err(&pdev->dev, "VCIF region already claimed\n");
+                ret = -EBUSY;
+                goto fail2;
+        }
+
+        davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size);
+        if (!davinci_vc->base) {
+                dev_err(&pdev->dev, "can't ioremap mem resource.\n");
+                ret = -ENOMEM;
+                goto fail3;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "no DMA resource\n");
+                return -ENXIO;
+        }
+
+        davinci_vc->davinci_vcif.dma_tx_channel = res->start;
+        davinci_vc->davinci_vcif.dma_tx_addr =
+                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
+
+        res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+        if (!res) {
+                dev_err(&pdev->dev, "no DMA resource\n");
+                return -ENXIO;
+        }
+
+        davinci_vc->davinci_vcif.dma_rx_channel = res->start;
+        davinci_vc->davinci_vcif.dma_rx_addr =
+                (dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
+
+        davinci_vc->dev = &pdev->dev;
+        davinci_vc->pdev = pdev;
+
+        /* Voice codec interface client */
+        cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
+        cell->name = "davinci_vcif";
+        cell->driver_data = davinci_vc;
+
+        /* Voice codec CQ93VC client */
+        cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
+        cell->name = "cq93vc";
+        cell->driver_data = davinci_vc;
+
+        ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
+                              DAVINCI_VC_CELLS, NULL, 0);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "fail to register client devices\n");
+                goto fail4;
+        }
+
+        return 0;
+
+fail4:
+        iounmap(davinci_vc->base);
+fail3:
+        release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
+fail2:
+        clk_disable(davinci_vc->clk);
+        clk_put(davinci_vc->clk);
+        davinci_vc->clk = NULL;
+fail1:
+        kfree(davinci_vc);
+
+        return ret;
+}
+
+static int __devexit davinci_vc_remove(struct platform_device *pdev)
+{
+        struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
+
+        mfd_remove_devices(&pdev->dev);
+
+        iounmap(davinci_vc->base);
+        release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
+
+        clk_disable(davinci_vc->clk);
+        clk_put(davinci_vc->clk);
+        davinci_vc->clk = NULL;
+
+        kfree(davinci_vc);
+
+        return 0;
+}
+
+static struct platform_driver davinci_vc_driver = {
+        .driver = {
+                .name = "davinci_voicecodec",
+                .owner = THIS_MODULE,
+        },
+        .remove = __devexit_p(davinci_vc_remove),
+};
+
+static int __init davinci_vc_init(void)
+{
+        return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
+}
+module_init(davinci_vc_init);
+
+static void __exit davinci_vc_exit(void)
+{
+        platform_driver_unregister(&davinci_vc_driver);
+}
+module_exit(davinci_vc_exit);
+
+MODULE_AUTHOR("Miguel Aguilar");
+MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
+MODULE_LICENSE("GPL");