| Message ID | 20170117131511.7252-2-abailon@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: musb: cppi41: Add a way to manage DMA irq | expand |
* Alexandre Bailon <abailon@baylibre.com> [170117 05:16]: > Currently, the CPPI 4.1 driver is not completely generic and > only work on dsps. > Add two functions which will help to move platform code from CPPI 4.1 to > MUSB glue driver: > - cppi41_register_dma_callback() to register a platform dma_callback > (e.g to acknowledge interrupt on DMA completion). > - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to > a musb pointer. This is required to get a musb pointer from DMA callbacks. Can't you just add a new function to struct dma_controller in musb_dma.h? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 01/18/2017 12:29 AM, Tony Lindgren wrote: > * Alexandre Bailon <abailon@baylibre.com> [170117 05:16]: >> Currently, the CPPI 4.1 driver is not completely generic and >> only work on dsps. >> Add two functions which will help to move platform code from CPPI 4.1 to >> MUSB glue driver: >> - cppi41_register_dma_callback() to register a platform dma_callback >> (e.g to acknowledge interrupt on DMA completion). >> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to >> a musb pointer. This is required to get a musb pointer from DMA callbacks. > > Can't you just add a new function to struct dma_controller in musb_dma.h? Yes, I can add the dma_callback function to dma_controller and then remove cppi41_register_dma_callback(). But I still to define cppi41_dma_controller_to_musb() except if I add a musb pointer to dma_controller. Regards, Alexandre > > Regards, > > Tony > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
* Alexandre Bailon <abailon@baylibre.com> [170118 06:54]: > On 01/18/2017 12:29 AM, Tony Lindgren wrote: > > * Alexandre Bailon <abailon@baylibre.com> [170117 05:16]: > >> Currently, the CPPI 4.1 driver is not completely generic and > >> only work on dsps. > >> Add two functions which will help to move platform code from CPPI 4.1 to > >> MUSB glue driver: > >> - cppi41_register_dma_callback() to register a platform dma_callback > >> (e.g to acknowledge interrupt on DMA completion). > >> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to > >> a musb pointer. This is required to get a musb pointer from DMA callbacks. > > > > Can't you just add a new function to struct dma_controller in musb_dma.h? > Yes, I can add the dma_callback function to dma_controller and then > remove cppi41_register_dma_callback(). OK > But I still to define cppi41_dma_controller_to_musb() except if I add a > musb pointer to dma_controller. Yeah makes sense to me. Or get it from the hw_ep that already has it? Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 01/18/2017 06:43 PM, Tony Lindgren wrote: > * Alexandre Bailon <abailon@baylibre.com> [170118 06:54]: >> On 01/18/2017 12:29 AM, Tony Lindgren wrote: >>> * Alexandre Bailon <abailon@baylibre.com> [170117 05:16]: >>>> Currently, the CPPI 4.1 driver is not completely generic and >>>> only work on dsps. >>>> Add two functions which will help to move platform code from CPPI 4.1 to >>>> MUSB glue driver: >>>> - cppi41_register_dma_callback() to register a platform dma_callback >>>> (e.g to acknowledge interrupt on DMA completion). >>>> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to >>>> a musb pointer. This is required to get a musb pointer from DMA callbacks. >>> >>> Can't you just add a new function to struct dma_controller in musb_dma.h? >> Yes, I can add the dma_callback function to dma_controller and then >> remove cppi41_register_dma_callback(). > > OK > >> But I still to define cppi41_dma_controller_to_musb() except if I add a >> musb pointer to dma_controller. > > Yeah makes sense to me. Or get it from the hw_ep that already has it? Yes hw_ep has it but it only available in cppi41_dma_callback(). I also need to get the musb pointer from dma_exit() callback (defined in musb_platform_ops). dma_exit only have one argument: struct dma_controller. Having musb in dma_controller make thing more easier. The other solution is to add a new argument to dma_exit(). Regards, Alexandre > > Regards, > > Tony > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
* Alexandre Bailon <abailon@baylibre.com> [170118 09:51]: > On 01/18/2017 06:43 PM, Tony Lindgren wrote: > > * Alexandre Bailon <abailon@baylibre.com> [170118 06:54]: > >> On 01/18/2017 12:29 AM, Tony Lindgren wrote: > >>> * Alexandre Bailon <abailon@baylibre.com> [170117 05:16]: > >>>> Currently, the CPPI 4.1 driver is not completely generic and > >>>> only work on dsps. > >>>> Add two functions which will help to move platform code from CPPI 4.1 to > >>>> MUSB glue driver: > >>>> - cppi41_register_dma_callback() to register a platform dma_callback > >>>> (e.g to acknowledge interrupt on DMA completion). > >>>> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to > >>>> a musb pointer. This is required to get a musb pointer from DMA callbacks. > >>> > >>> Can't you just add a new function to struct dma_controller in musb_dma.h? > >> Yes, I can add the dma_callback function to dma_controller and then > >> remove cppi41_register_dma_callback(). > > > > OK > > > >> But I still to define cppi41_dma_controller_to_musb() except if I add a > >> musb pointer to dma_controller. > > > > Yeah makes sense to me. Or get it from the hw_ep that already has it? > Yes hw_ep has it but it only available in cppi41_dma_callback(). > I also need to get the musb pointer from dma_exit() callback > (defined in musb_platform_ops). > dma_exit only have one argument: struct dma_controller. > Having musb in dma_controller make thing more easier. > The other solution is to add a new argument to dma_exit(). Seems like adding to struct dma_controller is less changes. Bin might have some preference here though. Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c index 1636385..d76022b 100644 --- a/drivers/usb/musb/musb_cppi41.c +++ b/drivers/usb/musb/musb_cppi41.c @@ -36,6 +36,8 @@ struct cppi41_dma_controller { u32 rx_mode; u32 tx_mode; u32 auto_req; + + cppi41_platform_dma_callback dma_callback; }; static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel) @@ -217,6 +219,10 @@ static void cppi41_dma_callback(void *private_data) int is_hs = 0; bool empty; + controller = cppi41_channel->controller; + if (controller->dma_callback) + controller->dma_callback(musb); + spin_lock_irqsave(&musb->lock, flags); dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie, @@ -249,8 +255,6 @@ static void cppi41_dma_callback(void *private_data) * We spin on HS (no longer than than 25us and setup a timer on * FS to check for the bit and complete the transfer. */ - controller = cppi41_channel->controller; - if (is_host_active(musb)) { if (musb->port1_status & USB_PORT_STAT_HIGH_SPEED) is_hs = 1; @@ -288,6 +292,16 @@ static void cppi41_dma_callback(void *private_data) spin_unlock_irqrestore(&musb->lock, flags); } +void cppi41_register_dma_callback(struct dma_controller *c, + cppi41_platform_dma_callback callback) +{ + struct cppi41_dma_controller *controller = container_of(c, + struct cppi41_dma_controller, controller); + + controller->dma_callback = callback; +} +EXPORT_SYMBOL_GPL(cppi41_register_dma_callback); + static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old) { unsigned shift; @@ -709,3 +723,12 @@ cppi41_dma_controller_create(struct musb *musb, void __iomem *base) return NULL; } EXPORT_SYMBOL_GPL(cppi41_dma_controller_create); + +struct musb *cppi41_dma_controller_to_musb(struct dma_controller *c) +{ + struct cppi41_dma_controller *controller = container_of(c, + struct cppi41_dma_controller, controller); + + return controller->musb; +} +EXPORT_SYMBOL_GPL(cppi41_dma_controller_to_musb); diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h index 46357e1..7f3c585 100644 --- a/drivers/usb/musb/musb_dma.h +++ b/drivers/usb/musb/musb_dma.h @@ -231,9 +231,13 @@ extern struct dma_controller * cppi_dma_controller_create(struct musb *musb, void __iomem *base); extern void cppi_dma_controller_destroy(struct dma_controller *c); +typedef void (*cppi41_platform_dma_callback)(struct musb *musb); extern struct dma_controller * cppi41_dma_controller_create(struct musb *musb, void __iomem *base); extern void cppi41_dma_controller_destroy(struct dma_controller *c); +extern struct musb *cppi41_dma_controller_to_musb(struct dma_controller *c); +extern void cppi41_register_dma_callback(struct dma_controller *c, + cppi41_platform_dma_callback callback); extern struct dma_controller * ux500_dma_controller_create(struct musb *musb, void __iomem *base);
Currently, the CPPI 4.1 driver is not completely generic and only work on dsps. Add two functions which will help to move platform code from CPPI 4.1 to MUSB glue driver: - cppi41_register_dma_callback() to register a platform dma_callback (e.g to acknowledge interrupt on DMA completion). - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to a musb pointer. This is required to get a musb pointer from DMA callbacks. Signed-off-by: Alexandre Bailon <abailon@baylibre.com> --- drivers/usb/musb/musb_cppi41.c | 27 +++++++++++++++++++++++++-- drivers/usb/musb/musb_dma.h | 4 ++++ 2 files changed, 29 insertions(+), 2 deletions(-) -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html