Blackfin: bf54x: add kconfig for UART2/3 DMA channel assignments
The BF54x lacks dedicated DMA channels for the UART peripherals and need
to be muxed between others. So add a kconfig option so people can select
which channels the UARTs will use so they can pick between SPORTs and the
less commonly used EPPI/PIXC peripherals.
Signed-off-by: steven miao <realmz6@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 1e485df..6ce8dce 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -84,6 +84,24 @@
late_initcall(proc_dma_init);
#endif
+static void set_dma_peripheral_map(unsigned int channel, const char *device_id)
+{
+#ifdef CONFIG_BF54x
+ unsigned int per_map;
+
+ switch (channel) {
+ case CH_UART2_RX: per_map = 0xC << 12; break;
+ case CH_UART2_TX: per_map = 0xD << 12; break;
+ case CH_UART3_RX: per_map = 0xE << 12; break;
+ case CH_UART3_TX: per_map = 0xF << 12; break;
+ default: return;
+ }
+
+ if (strncmp(device_id, "BFIN_UART", 9) == 0)
+ dma_ch[channel].regs->peripheral_map = per_map;
+#endif
+}
+
/**
* request_dma - request a DMA channel
*
@@ -111,19 +129,7 @@
return -EBUSY;
}
-#ifdef CONFIG_BF54x
- if (channel >= CH_UART2_RX && channel <= CH_UART3_TX) {
- unsigned int per_map;
- per_map = dma_ch[channel].regs->peripheral_map & 0xFFF;
- if (strncmp(device_id, "BFIN_UART", 9) == 0)
- dma_ch[channel].regs->peripheral_map = per_map |
- ((channel - CH_UART2_RX + 0xC)<<12);
- else
- dma_ch[channel].regs->peripheral_map = per_map |
- ((channel - CH_UART2_RX + 0x6)<<12);
- }
-#endif
-
+ set_dma_peripheral_map(channel, device_id);
dma_ch[channel].device_id = device_id;
dma_ch[channel].irq = 0;
diff --git a/arch/blackfin/mach-bf548/Kconfig b/arch/blackfin/mach-bf548/Kconfig
index 70189a0..94acb58 100644
--- a/arch/blackfin/mach-bf548/Kconfig
+++ b/arch/blackfin/mach-bf548/Kconfig
@@ -42,6 +42,65 @@
async address or GPIO port F and G. Select y to route it
to GPIO.
+choice
+ prompt "UART2 DMA channel selection"
+ depends on SERIAL_BFIN_UART2
+ default UART2_DMA_RX_ON_DMA18
+ help
+ UART2 DMA channel selection
+ RX -> DMA18
+ TX -> DMA19
+ or
+ RX -> DMA13
+ TX -> DMA14
+
+config UART2_DMA_RX_ON_DMA18
+ bool "UART2 DMA RX -> DMA18 TX -> DMA19"
+ help
+ UART2 DMA channel assignment
+ RX -> DMA18
+ TX -> DMA19
+ use SPORT2 default DMA channel
+
+config UART2_DMA_RX_ON_DMA13
+ bool "UART2 DMA RX -> DMA13 TX -> DMA14"
+ help
+ UART2 DMA channel assignment
+ RX -> DMA13
+ TX -> DMA14
+ use EPPI1 EPPI2 default DMA channel
+endchoice
+
+choice
+ prompt "UART3 DMA channel selection"
+ depends on SERIAL_BFIN_UART3
+ default UART3_DMA_RX_ON_DMA20
+ help
+ UART3 DMA channel selection
+ RX -> DMA20
+ TX -> DMA21
+ or
+ RX -> DMA15
+ TX -> DMA16
+
+config UART3_DMA_RX_ON_DMA20
+ bool "UART3 DMA RX -> DMA20 TX -> DMA21"
+ help
+ UART3 DMA channel assignment
+ RX -> DMA20
+ TX -> DMA21
+ use SPORT3 default DMA channel
+
+config UART3_DMA_RX_ON_DMA15
+ bool "UART3 DMA RX -> DMA15 TX -> DMA16"
+ help
+ UART3 DMA channel assignment
+ RX -> DMA15
+ TX -> DMA16
+ use PIXC default DMA channel
+
+endchoice
+
comment "Interrupt Priority Assignment"
menu "Priority"
diff --git a/arch/blackfin/mach-bf548/include/mach/dma.h b/arch/blackfin/mach-bf548/include/mach/dma.h
index a30d242..1a1091b 100644
--- a/arch/blackfin/mach-bf548/include/mach/dma.h
+++ b/arch/blackfin/mach-bf548/include/mach/dma.h
@@ -27,17 +27,37 @@
#define CH_PIXC_OVERLAY 16
#define CH_PIXC_OUTPUT 17
#define CH_SPORT2_RX 18
-#define CH_UART2_RX 18
#define CH_SPORT2_TX 19
-#define CH_UART2_TX 19
#define CH_SPORT3_RX 20
-#define CH_UART3_RX 20
#define CH_SPORT3_TX 21
-#define CH_UART3_TX 21
#define CH_SDH 22
#define CH_NFC 22
#define CH_SPI2 23
+#if defined(CONFIG_UART2_DMA_RX_ON_DMA13)
+#define CH_UART2_RX 13
+#define IRQ_UART2_RX BFIN_IRQ(37) /* UART2 RX USE EPP1 (DMA13) Interrupt */
+#define CH_UART2_TX 14
+#define IRQ_UART2_TX BFIN_IRQ(38) /* UART2 RX USE EPP1 (DMA14) Interrupt */
+#else /* Default USE SPORT2's DMA Channel */
+#define CH_UART2_RX 18
+#define IRQ_UART2_RX BFIN_IRQ(33) /* UART2 RX (DMA18) Interrupt */
+#define CH_UART2_TX 19
+#define IRQ_UART2_TX BFIN_IRQ(34) /* UART2 TX (DMA19) Interrupt */
+#endif
+
+#if defined(CONFIG_UART3_DMA_RX_ON_DMA15)
+#define CH_UART3_RX 15
+#define IRQ_UART3_RX BFIN_IRQ(64) /* UART3 RX USE PIXC IN0 (DMA15) Interrupt */
+#define CH_UART3_TX 16
+#define IRQ_UART3_TX BFIN_IRQ(65) /* UART3 TX USE PIXC IN1 (DMA16) Interrupt */
+#else /* Default USE SPORT3's DMA Channel */
+#define CH_UART3_RX 20
+#define IRQ_UART3_RX BFIN_IRQ(35) /* UART3 RX (DMA20) Interrupt */
+#define CH_UART3_TX 21
+#define IRQ_UART3_TX BFIN_IRQ(36) /* UART3 TX (DMA21) Interrupt */
+#endif
+
#define CH_MEM_STREAM0_DEST 24
#define CH_MEM_STREAM0_SRC 25
#define CH_MEM_STREAM1_DEST 26
diff --git a/arch/blackfin/mach-bf548/include/mach/irq.h b/arch/blackfin/mach-bf548/include/mach/irq.h
index 99fd1b2..7f87787 100644
--- a/arch/blackfin/mach-bf548/include/mach/irq.h
+++ b/arch/blackfin/mach-bf548/include/mach/irq.h
@@ -74,13 +74,9 @@
#define IRQ_UART2_ERROR BFIN_IRQ(31) /* UART2 Status (Error) Interrupt */
#define IRQ_CAN0_ERROR BFIN_IRQ(32) /* CAN0 Status (Error) Interrupt */
#define IRQ_SPORT2_RX BFIN_IRQ(33) /* SPORT2 RX (DMA18) Interrupt */
-#define IRQ_UART2_RX BFIN_IRQ(33) /* UART2 RX (DMA18) Interrupt */
#define IRQ_SPORT2_TX BFIN_IRQ(34) /* SPORT2 TX (DMA19) Interrupt */
-#define IRQ_UART2_TX BFIN_IRQ(34) /* UART2 TX (DMA19) Interrupt */
#define IRQ_SPORT3_RX BFIN_IRQ(35) /* SPORT3 RX (DMA20) Interrupt */
-#define IRQ_UART3_RX BFIN_IRQ(35) /* UART3 RX (DMA20) Interrupt */
#define IRQ_SPORT3_TX BFIN_IRQ(36) /* SPORT3 TX (DMA21) Interrupt */
-#define IRQ_UART3_TX BFIN_IRQ(36) /* UART3 TX (DMA21) Interrupt */
#define IRQ_EPPI1 BFIN_IRQ(37) /* EPP1 (DMA13) Interrupt */
#define IRQ_EPPI2 BFIN_IRQ(38) /* EPP2 (DMA14) Interrupt */
#define IRQ_SPI1 BFIN_IRQ(39) /* SPI1 (DMA5) Interrupt */