On 11/19/2014 07:52 PM, Kenneth Westfield wrote:
From: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Add the native LPAIF driver for LPASS block in Qualcomm
Technologies SoCs.
Change-Id: I0f06f73a1267d7721209e58ce18e0d4897001141
Signed-off-by: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Signed-off-by: Banajit Goswami <bgoswami@xxxxxxxxxxxxxx>
---
sound/soc/qcom/lpass-lpaif.c | 488 +++++++++++++++++++++++++++++++++++++++++++
sound/soc/qcom/lpass-lpaif.h | 181 ++++++++++++++++
2 files changed, 669 insertions(+)
create mode 100644 sound/soc/qcom/lpass-lpaif.c
create mode 100644 sound/soc/qcom/lpass-lpaif.h
diff --git a/sound/soc/qcom/lpass-lpaif.c b/sound/soc/qcom/lpass-lpaif.c
new file mode 100644
index 0000000000000000000000000000000000000000..e62843fe9bc4c63c3c7c119a9f076085b16a56b3
--- /dev/null
+++ b/sound/soc/qcom/lpass-lpaif.c
@@ -0,0 +1,488 @@
+/*
+ * Copyright (c) 2010-2011,2013-2014 The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/types.h>
+#include <sound/soc.h>
+#include "lpass-lpaif.h"
+
+#define DRV_NAME "lpass-lpaif"
+#define DRV_VERSION "1.0"
+
+struct lpaif_dai_baseinfo {
+ void __iomem *base;
+};
+
+struct lpaif_dai_drv {
+ unsigned char *buffer;
+ dma_addr_t buffer_phys;
+ int channels;
+ irqreturn_t (*callback)(int intrsrc, void *private_data);
+ void *private_data;
+ int in_use;
+ unsigned int buffer_len;
+ unsigned int period_len;
+ unsigned int master_mode;
+};
+
+static struct lpaif_dai_baseinfo lpaif_dai_info;
+static struct lpaif_dai_drv *lpaif_dai[LPAIF_MAX_CHANNELS];
+static spinlock_t lpaif_lock;
+static struct resource *lpaif_irq;
Please don't use global state for device drivers. Make the state device
instance specific.
+
[...]
+
+static int lpaif_dai_probe(struct platform_device *pdev)
+{
+ uint8_t i;
+ int32_t rc;
+ struct resource *lpa_res;
+ struct device *lpaif_device;
+
+ lpaif_device = &pdev->dev;
+
+ lpa_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "lpass-lpaif-mem");
+ if (!lpa_res) {
+ dev_err(&pdev->dev, "%s: error getting resource\n", __func__);
+ return -ENODEV;
+ }
+ lpaif_dai_info.base = ioremap(lpa_res->start,
+ (lpa_res->end - lpa_res->start));
It's probably better to use devm_ioremap_resource here.
+ if (!lpaif_dai_info.base) {
+ dev_err(&pdev->dev, "%s: error remapping resource\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ lpaif_irq = platform_get_resource_byname(
+ pdev, IORESOURCE_IRQ, "lpass-lpaif-irq");
platform_get_irq_byname
+ if (!lpaif_irq) {
+ dev_err(&pdev->dev, "%s: failed get irq res\n", __func__);
+ rc = -ENODEV;
+ goto error;
+ }
+
+ rc = request_irq(lpaif_irq->start, lpaif_dai_irq_handler,
+ IRQF_TRIGGER_RISING, "lpass-lpaif-intr", NULL);
+
+ if (rc < 0) {
+ dev_err(&pdev->dev, "%s: irq resource request failed\n",
+ __func__);
+ goto error;
+ }
+
+ /*
+ * Allocating memory for all the LPA_IF DMA channels
+ */
+ for (i = 0; i < LPAIF_MAX_CHANNELS; i++) {
+ lpaif_dai[i] = kzalloc(sizeof(struct lpaif_dai_drv),
+ GFP_KERNEL);
+ if (!lpaif_dai[i]) {
+ rc = -ENOMEM;
+ goto error_irq;
+ }
+ }
+ spin_lock_init(&lpaif_lock);
This needs to be initialized before you request the interrupt as the
interrupt handler is using the spinlock.
+ return 0;
+
+error_irq:
+ free_irq(lpaif_irq->start, NULL);
+ lpaif_dai_ch_free();
+error:
+ iounmap(lpaif_dai_info.base);
+ return rc;
+}
+
+static int lpaif_dai_remove(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < LPAIF_MAX_CHANNELS; i++)
+ lpaif_dai_stop(i);
+ synchronize_irq(lpaif_irq->start);
free_irq does a synchronize_irq, not need to call it manually.
+ free_irq(lpaif_irq->start, NULL);
+ iounmap(lpaif_dai_info.base);
+ lpaif_dai_ch_free();
+ return 0;
+}
+
[..]
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