rp2040: Add kconfig options for rp2040 uart (#6549)

Modified serial.c and Kconfig to dynamically select all possible UART combinations for RP2040

Signed-off-by: Hriday Keni <info@amken.us>

2 files changed, 97 insertions, 23 deletions

diff --git a/src/rp2040/Kconfig b/src/rp2040/Kconfig
index 59891649..ec8a1af3 100644
--- a/src/rp2040/Kconfig
+++ b/src/rp2040/Kconfig
@@ -95,19 +95,40 @@ config RP2040_STAGE2_CLKDIV
 ######################################################################
 
 choice
-    prompt "Communication interface"
-    config RP2040_USB
-        bool "USB"
-        select USBSERIAL
-    config RP2040_SERIAL_UART0
-        bool "Serial (on UART0 GPIO1/GPIO0)"
-        select SERIAL
-    config RP2040_CANBUS
-        bool "CAN bus"
-        select CANSERIAL
-    config RP2040_USBCANBUS
-        bool "USB to CAN bus bridge"
-        select USBCANBUS
+ prompt "Communication Interface"
+ config RP2040_USB
+     bool "USBSERIAL"
+     select USBSERIAL
+ config RP2040_SERIAL_UART0_PINS_0_1
+      bool "UART0 on GPIO0/GPIO1"
+      select SERIAL
+ config RP2040_SERIAL_UART0_PINS_12_13
+      bool "UART0 on GPIO12/GPIO13" if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_SERIAL_UART0_PINS_16_17
+      bool "UART0 on GPIO16/GPIO17" if LOW_LEVEL_OPTIONS
+      select SERIAL
+  config RP2040_SERIAL_UART0_PINS_28_29
+      bool "UART0 on GPIO28/GPIO29" if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_SERIAL_UART1_PINS_4_5
+      bool "UART1 on GPIO4/GPIO5" if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_SERIAL_UART1_PINS_8_9
+      bool "UART1 on  GPIO8/GPIO9" if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_SERIAL_UART1_PINS_20_21
+      bool "UART1 on  GPIO20/GPIO21" if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_SERIAL_UART1_PINS_24_25
+      bool "UART1 on GPIO24/GPIO25"  if LOW_LEVEL_OPTIONS
+      select SERIAL
+ config RP2040_CANBUS
+       bool "CAN bus"
+       select CANSERIAL
+ config RP2040_USBCANBUS
+       bool "USB to CAN bus bridge"
+       select USBCANBUS
 endchoice
 
 config RP2040_CANBUS_GPIO_RX
diff --git a/src/rp2040/serial.c b/src/rp2040/serial.c
index abfdcb8b..351a873e 100644
--- a/src/rp2040/serial.c
+++ b/src/rp2040/serial.c
@@ -4,20 +4,64 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
+
 #include <stdint.h> // uint32_t
-#include "autoconf.h" // CONFIG_SERIAL
+#include "autoconf.h" // Include configuration header
 #include "board/armcm_boot.h" // armcm_enable_irq
 #include "board/irq.h" // irq_save
 #include "board/serial_irq.h" // serial_rx_data
-#include "hardware/structs/resets.h" // RESETS_RESET_UART0_BITS
-#include "hardware/structs/uart.h" // UART0_BASE
-#include "internal.h" // UART0_IRQn
+#include "hardware/structs/resets.h" // RESETS_RESET_UART0/1_BITS
+#include "hardware/structs/uart.h" // uart0_hw, uart1_hw
+#include "internal.h" // UART0_IRQn, UART1_IRQn
 #include "sched.h" // DECL_INIT
 
-#define UARTx uart0_hw
-#define UARTx_IRQn UART0_IRQ_IRQn
-#define GPIO_Rx 1
-#define GPIO_Tx 0
+// Dynamically select UART and IRQ based on configuration
+
+
+    #if CONFIG_RP2040_SERIAL_UART0_PINS_0_1
+        #define GPIO_Rx 1
+        #define GPIO_Tx 0
+        #define UARTx uart0_hw
+        #define UARTx_IRQn UART0_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART0_PINS_12_13
+        #define GPIO_Rx 13
+        #define GPIO_Tx 12
+        #define UARTx uart0_hw
+        #define UARTx_IRQn UART0_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART0_PINS_16_17
+        #define GPIO_Rx 17
+        #define GPIO_Tx 16
+        #define UARTx uart0_hw
+        #define UARTx_IRQn UART0_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART0_PINS_28_29
+        #define GPIO_Rx 29
+        #define GPIO_Tx 28
+        #define UARTx uart1_hw
+        #define UARTx_IRQn UART1_IRQ_IRQn
+        #define UARTx uart0_hw
+        #define UARTx_IRQn UART0_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART1_PINS_4_5
+        #define GPIO_Rx 5
+        #define GPIO_Tx 4
+        #define UARTx uart1_hw
+        #define UARTx_IRQn UART1_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART1_PINS_8_9
+        #define GPIO_Rx 9
+        #define GPIO_Tx 8
+        #define UARTx uart1_hw
+        #define UARTx_IRQn UART1_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART1_PINS_20_21
+        #define GPIO_Rx 20
+        #define GPIO_Tx 21
+        #define UARTx uart1_hw
+        #define UARTx_IRQn UART1_IRQ_IRQn
+    #elif CONFIG_RP2040_SERIAL_UART1_PINS_24_25
+        #define GPIO_Rx 24
+        #define GPIO_Tx 25
+        #define UARTx uart1_hw
+        #define UARTx_IRQn UART1_IRQ_IRQn
+    #endif
+
 
 // Write tx bytes to the serial port
 static void
@@ -67,10 +111,19 @@ serial_enable_tx_irq(void)
 void
 serial_init(void)
 {
-    enable_pclock(RESETS_RESET_UART0_BITS);
+
+    uint32_t pclk= 0x00;
+    if (UARTx == uart0_hw){
+        enable_pclock(RESETS_RESET_UART0_BITS);
+        pclk= get_pclock_frequency(RESETS_RESET_UART0_BITS);
+    } else {
+        enable_pclock(RESETS_RESET_UART1_BITS);
+        pclk = get_pclock_frequency(RESETS_RESET_UART1_BITS);
+    }
+
 
     // Setup baud
-    uint32_t pclk = get_pclock_frequency(RESETS_RESET_UART0_BITS);
+
     uint32_t div = DIV_ROUND_CLOSEST(pclk * 4, CONFIG_SERIAL_BAUD);
     UARTx->ibrd = div >> 6;
     UARTx->fbrd = div & 0x3f;