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authorAlexandre Bailon <abailon@baylibre.com>2017-02-06 22:53:56 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-09 13:35:05 +0100
commit255348289f714b96e0e95f9b702f435a638e6fd4 (patch)
tree8582ea828878ab62ba768725eccf809897e2f07d /drivers/usb
parenta96ca0d20636b594f28772454eedb2b7d8da5a1b (diff)
usb: musb: dsps: Manage CPPI 4.1 DMA interrupt in DSPS
Despite the CPPI 4.1 is a generic DMA, it is tied to USB. On the DSPS, CPPI 4.1 interrupt's registers are in USBSS (the MUSB glue). Currently, to enable / disable and clear interrupts, the CPPI 4.1 driver maps and accesses to USBSS's register, which making CPPI 4.1 driver not really generic. Move the interrupt management to DSPS driver. Signed-off-by: Alexandre Bailon <abailon@baylibre.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb/musb_dsps.c81
1 files changed, 79 insertions, 2 deletions
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index c171a0f13bc3..7c047c4a2565 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -122,6 +122,7 @@ struct dsps_glue {
struct timer_list timer; /* otg_workaround timer */
unsigned long last_timer; /* last timer data for each instance */
bool sw_babble_enabled;
+ void __iomem *usbss_base;
struct dsps_context context;
struct debugfs_regset32 regset;
@@ -169,6 +170,13 @@ static void dsps_mod_timer_optional(struct dsps_glue *glue)
dsps_mod_timer(glue, -1);
}
+/* USBSS / USB AM335x */
+#define USBSS_IRQ_STATUS 0x28
+#define USBSS_IRQ_ENABLER 0x2c
+#define USBSS_IRQ_CLEARR 0x30
+
+#define USBSS_IRQ_PD_COMP (1 << 2)
+
/**
* dsps_musb_enable - enable interrupts
*/
@@ -641,14 +649,76 @@ static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
}
}
+#ifdef CONFIG_USB_TI_CPPI41_DMA
+static void dsps_dma_controller_callback(struct dma_controller *c)
+{
+ struct musb *musb = c->musb;
+ struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
+ void __iomem *usbss_base = glue->usbss_base;
+ u32 status;
+
+ status = musb_readl(usbss_base, USBSS_IRQ_STATUS);
+ if (status & USBSS_IRQ_PD_COMP)
+ musb_writel(usbss_base, USBSS_IRQ_STATUS, USBSS_IRQ_PD_COMP);
+}
+
+static struct dma_controller *
+dsps_dma_controller_create(struct musb *musb, void __iomem *base)
+{
+ struct dma_controller *controller;
+ struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
+ void __iomem *usbss_base = glue->usbss_base;
+
+ controller = cppi41_dma_controller_create(musb, base);
+ if (IS_ERR_OR_NULL(controller))
+ return controller;
+
+ musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
+ controller->dma_callback = dsps_dma_controller_callback;
+
+ return controller;
+}
+
+static void dsps_dma_controller_destroy(struct dma_controller *c)
+{
+ struct musb *musb = c->musb;
+ struct dsps_glue *glue = dev_get_drvdata(musb->controller->parent);
+ void __iomem *usbss_base = glue->usbss_base;
+
+ musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP);
+ cppi41_dma_controller_destroy(c);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static void dsps_dma_controller_suspend(struct dsps_glue *glue)
+{
+ void __iomem *usbss_base = glue->usbss_base;
+
+ musb_writel(usbss_base, USBSS_IRQ_CLEARR, USBSS_IRQ_PD_COMP);
+}
+
+static void dsps_dma_controller_resume(struct dsps_glue *glue)
+{
+ void __iomem *usbss_base = glue->usbss_base;
+
+ musb_writel(usbss_base, USBSS_IRQ_ENABLER, USBSS_IRQ_PD_COMP);
+}
+#endif
+#else /* CONFIG_USB_TI_CPPI41_DMA */
+#ifdef CONFIG_PM_SLEEP
+static void dsps_dma_controller_suspend(struct dsps_glue *glue) {}
+static void dsps_dma_controller_resume(struct dsps_glue *glue) {}
+#endif
+#endif /* CONFIG_USB_TI_CPPI41_DMA */
+
static struct musb_platform_ops dsps_ops = {
.quirks = MUSB_DMA_CPPI41 | MUSB_INDEXED_EP,
.init = dsps_musb_init,
.exit = dsps_musb_exit,
#ifdef CONFIG_USB_TI_CPPI41_DMA
- .dma_init = cppi41_dma_controller_create,
- .dma_exit = cppi41_dma_controller_destroy,
+ .dma_init = dsps_dma_controller_create,
+ .dma_exit = dsps_dma_controller_destroy,
#endif
.enable = dsps_musb_enable,
.disable = dsps_musb_disable,
@@ -856,6 +926,9 @@ static int dsps_probe(struct platform_device *pdev)
glue->dev = &pdev->dev;
glue->wrp = wrp;
+ glue->usbss_base = of_iomap(pdev->dev.parent->of_node, 0);
+ if (!glue->usbss_base)
+ return -ENXIO;
if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
ret = dsps_setup_optional_vbus_irq(pdev, glue);
@@ -950,6 +1023,8 @@ static int dsps_suspend(struct device *dev)
glue->context.tx_mode = musb_readl(mbase, wrp->tx_mode);
glue->context.rx_mode = musb_readl(mbase, wrp->rx_mode);
+ dsps_dma_controller_suspend(glue);
+
return 0;
}
@@ -963,6 +1038,8 @@ static int dsps_resume(struct device *dev)
if (!musb)
return 0;
+ dsps_dma_controller_resume(glue);
+
mbase = musb->ctrl_base;
musb_writel(mbase, wrp->control, glue->context.control);
musb_writel(mbase, wrp->epintr_set, glue->context.epintr);