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Date: Mon, 22 Jul 2013 20:09:59 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: balbi@...com, george.cherian@...com,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 08/16] usb: musb: dma: merge ->start/stop into create/destroy
The core code creates a controller and immediately after that it calls
the ->start() callback. This one might drop an error but nobody cares.
The same thing happens in the destroy corner: First ->stop() called
followed by destroy callback. So why not merge those two into the same
function since there is no difference.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
drivers/usb/musb/cppi_dma.c | 18 +++++-------------
drivers/usb/musb/musb_core.c | 18 ++++--------------
drivers/usb/musb/musb_dma.h | 2 --
drivers/usb/musb/musbhsdma.c | 16 +++-------------
drivers/usb/musb/tusb6010_omap.c | 24 ------------------------
drivers/usb/musb/ux500_dma.c | 19 ++++++++-----------
6 files changed, 20 insertions(+), 77 deletions(-)
diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index 9db211e..904fb85 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -150,14 +150,11 @@ static void cppi_pool_free(struct cppi_channel *c)
c->last_processed = NULL;
}
-static int cppi_controller_start(struct dma_controller *c)
+static void cppi_controller_start(struct cppi *controller)
{
- struct cppi *controller;
void __iomem *tibase;
int i;
- controller = container_of(c, struct cppi, controller);
-
/* do whatever is necessary to start controller */
for (i = 0; i < ARRAY_SIZE(controller->tx); i++) {
controller->tx[i].transmit = true;
@@ -212,8 +209,6 @@ static int cppi_controller_start(struct dma_controller *c)
/* disable RNDIS mode, also host rx RNDIS autorequest */
musb_writel(tibase, DAVINCI_RNDIS_REG, 0);
musb_writel(tibase, DAVINCI_AUTOREQ_REG, 0);
-
- return 0;
}
/*
@@ -222,14 +217,12 @@ static int cppi_controller_start(struct dma_controller *c)
* De-Init the DMA controller as necessary.
*/
-static int cppi_controller_stop(struct dma_controller *c)
+static void cppi_controller_stop(struct cppi *controller)
{
- struct cppi *controller;
void __iomem *tibase;
int i;
struct musb *musb;
- controller = container_of(c, struct cppi, controller);
musb = controller->musb;
tibase = controller->tibase;
@@ -255,8 +248,6 @@ static int cppi_controller_stop(struct dma_controller *c)
/*disable tx/rx cppi */
musb_writel(tibase, DAVINCI_TXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_DISABLE);
musb_writel(tibase, DAVINCI_RXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_DISABLE);
-
- return 0;
}
/* While dma channel is allocated, we only want the core irqs active
@@ -1321,8 +1312,6 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *mr
controller->tibase = mregs - DAVINCI_BASE_OFFSET;
controller->musb = musb;
- controller->controller.start = cppi_controller_start;
- controller->controller.stop = cppi_controller_stop;
controller->controller.channel_alloc = cppi_channel_allocate;
controller->controller.channel_release = cppi_channel_release;
controller->controller.channel_program = cppi_channel_program;
@@ -1351,6 +1340,7 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *mr
controller->irq = irq;
}
+ cppi_controller_start(controller);
return &controller->controller;
}
@@ -1363,6 +1353,8 @@ void dma_controller_destroy(struct dma_controller *c)
cppi = container_of(c, struct cppi, controller);
+ cppi_controller_stop(cppi);
+
if (cppi->irq)
free_irq(cppi->irq, cppi->musb);
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 29a24ce..a4434d2 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1764,12 +1764,8 @@ static void musb_free(struct musb *musb)
disable_irq_wake(musb->nIrq);
free_irq(musb->nIrq, musb);
}
- if (is_dma_capable() && musb->dma_controller) {
- struct dma_controller *c = musb->dma_controller;
-
- (void) c->stop(c);
- dma_controller_destroy(c);
- }
+ if (is_dma_capable() && musb->dma_controller)
+ dma_controller_destroy(musb->dma_controller);
musb_host_free(musb);
}
@@ -1845,14 +1841,8 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
pm_runtime_get_sync(musb->controller);
#ifndef CONFIG_MUSB_PIO_ONLY
- if (use_dma && dev->dma_mask) {
- struct dma_controller *c;
-
- c = dma_controller_create(musb, musb->mregs);
- musb->dma_controller = c;
- if (c)
- (void) c->start(c);
- }
+ if (use_dma && dev->dma_mask)
+ musb->dma_controller = dma_controller_create(musb, musb->mregs);
#endif
/* ideally this would be abstracted in platform setup */
if (!is_dma_capable() || !musb->dma_controller)
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
index 8919ce2..3603711 100644
--- a/drivers/usb/musb/musb_dma.h
+++ b/drivers/usb/musb/musb_dma.h
@@ -159,8 +159,6 @@ dma_channel_status(struct dma_channel *c)
* Controllers manage dma channels.
*/
struct dma_controller {
- int (*start)(struct dma_controller *);
- int (*stop)(struct dma_controller *);
struct dma_channel *(*channel_alloc)(struct dma_controller *,
struct musb_hw_ep *, u8 is_tx);
void (*channel_release)(struct dma_channel *);
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index 3d1fd52..092cedf 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -37,18 +37,10 @@
#include "musb_core.h"
#include "musbhsdma.h"
-static int dma_controller_start(struct dma_controller *c)
-{
- /* nothing to do */
- return 0;
-}
-
static void dma_channel_release(struct dma_channel *channel);
-static int dma_controller_stop(struct dma_controller *c)
+static void dma_controller_stop(struct musb_dma_controller *controller)
{
- struct musb_dma_controller *controller = container_of(c,
- struct musb_dma_controller, controller);
struct musb *musb = controller->private_data;
struct dma_channel *channel;
u8 bit;
@@ -67,8 +59,6 @@ static int dma_controller_stop(struct dma_controller *c)
}
}
}
-
- return 0;
}
static struct dma_channel *dma_channel_allocate(struct dma_controller *c,
@@ -374,6 +364,8 @@ void dma_controller_destroy(struct dma_controller *c)
if (!controller)
return;
+ dma_controller_stop(controller);
+
if (controller->irq)
free_irq(controller->irq, c);
@@ -400,8 +392,6 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *ba
controller->private_data = musb;
controller->base = base;
- controller->controller.start = dma_controller_start;
- controller->controller.stop = dma_controller_stop;
controller->controller.channel_alloc = dma_channel_allocate;
controller->controller.channel_release = dma_channel_release;
controller->controller.channel_program = dma_channel_program;
diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c
index 98df17c..b8794eb 100644
--- a/drivers/usb/musb/tusb6010_omap.c
+++ b/drivers/usb/musb/tusb6010_omap.c
@@ -66,28 +66,6 @@ struct tusb_omap_dma {
unsigned multichannel:1;
};
-static int tusb_omap_dma_start(struct dma_controller *c)
-{
- struct tusb_omap_dma *tusb_dma;
-
- tusb_dma = container_of(c, struct tusb_omap_dma, controller);
-
- /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
-
- return 0;
-}
-
-static int tusb_omap_dma_stop(struct dma_controller *c)
-{
- struct tusb_omap_dma *tusb_dma;
-
- tusb_dma = container_of(c, struct tusb_omap_dma, controller);
-
- /* dev_dbg(musb->controller, "ep%i ch: %i\n", chdat->epnum, chdat->ch); */
-
- return 0;
-}
-
/*
* Allocate dmareq0 to the current channel unless it's already taken
*/
@@ -695,8 +673,6 @@ struct dma_controller *dma_controller_create(struct musb *musb, void __iomem *ba
tusb_dma->dmareq = -1;
tusb_dma->sync_dev = -1;
- tusb_dma->controller.start = tusb_omap_dma_start;
- tusb_dma->controller.stop = tusb_omap_dma_stop;
tusb_dma->controller.channel_alloc = tusb_omap_dma_allocate;
tusb_dma->controller.channel_release = tusb_omap_dma_release;
tusb_dma->controller.channel_program = tusb_omap_dma_program;
diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index bfb7a65..1ce214e 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -254,10 +254,8 @@ static int ux500_dma_channel_abort(struct dma_channel *channel)
return 0;
}
-static int ux500_dma_controller_stop(struct dma_controller *c)
+static void ux500_dma_controller_stop(struct ux500_dma_controller *controller)
{
- struct ux500_dma_controller *controller = container_of(c,
- struct ux500_dma_controller, controller);
struct ux500_dma_channel *ux500_channel;
struct dma_channel *channel;
u8 ch_num;
@@ -281,14 +279,10 @@ static int ux500_dma_controller_stop(struct dma_controller *c)
if (ux500_channel->dma_chan)
dma_release_channel(ux500_channel->dma_chan);
}
-
- return 0;
}
-static int ux500_dma_controller_start(struct dma_controller *c)
+static int ux500_dma_controller_start(struct ux500_dma_controller *controller)
{
- struct ux500_dma_controller *controller = container_of(c,
- struct ux500_dma_controller, controller);
struct ux500_dma_channel *ux500_channel = NULL;
struct musb *musb = controller->private_data;
struct device *dev = musb->controller;
@@ -347,7 +341,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
dir, ch_num);
/* Release already allocated channels */
- ux500_dma_controller_stop(c);
+ ux500_dma_controller_stop(controller);
return -EBUSY;
}
@@ -369,6 +363,7 @@ void dma_controller_destroy(struct dma_controller *c)
struct ux500_dma_controller *controller = container_of(c,
struct ux500_dma_controller, controller);
+ ux500_dma_controller_stop(controller);
kfree(controller);
}
@@ -378,6 +373,7 @@ struct dma_controller *dma_controller_create(struct musb *musb,
struct ux500_dma_controller *controller;
struct platform_device *pdev = to_platform_device(musb->controller);
struct resource *iomem;
+ int ret;
controller = kzalloc(sizeof(*controller), GFP_KERNEL);
if (!controller)
@@ -394,14 +390,15 @@ struct dma_controller *dma_controller_create(struct musb *musb,
controller->phy_base = (dma_addr_t) iomem->start;
- controller->controller.start = ux500_dma_controller_start;
- controller->controller.stop = ux500_dma_controller_stop;
controller->controller.channel_alloc = ux500_dma_channel_allocate;
controller->controller.channel_release = ux500_dma_channel_release;
controller->controller.channel_program = ux500_dma_channel_program;
controller->controller.channel_abort = ux500_dma_channel_abort;
controller->controller.is_compatible = ux500_dma_is_compatible;
+ ret = ux500_dma_controller_start(controller);
+ if (ret)
+ goto plat_get_fail;
return &controller->controller;
plat_get_fail:
--
1.8.3.2
--
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