include/console/uart: make index parameter unsigned

The UART index is never negative, so make it unsigned and drop the
checks for the index to be non-negative.

Change-Id: I64bd60bd2a3b82552cb3ac6524792b9ac6c09a94
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45294
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/drivers/uart/oxpcie_early.c

@@ -55,9 +55,9 @@ static int oxpcie_uart_active(void)
 	return oxpcie_present;
 }
 
-uintptr_t uart_platform_base(int idx)
+uintptr_t uart_platform_base(unsigned int idx)
 {
-	if ((idx >= 0) && (idx < 8) && oxpcie_uart_active())
+	if ((idx < 8) && oxpcie_uart_active())
 		return uart0_base + idx * 0x200;
 	return 0;
 }

src/drivers/uart/pl011.c

@@ -5,11 +5,11 @@
 #include <console/uart.h>
 #include <drivers/uart/pl011.h>
 
-void uart_init(int idx)
+void uart_init(unsigned int idx)
 {
 }
 
-void uart_tx_byte(int idx, unsigned char data)
+void uart_tx_byte(unsigned int idx, unsigned char data)
 {
 	struct pl011_uart *regs = uart_platform_baseptr(idx);
 
@@ -17,7 +17,7 @@ void uart_tx_byte(int idx, unsigned char data)
 	uart_tx_flush(idx);
 }
 
-void uart_tx_flush(int idx)
+void uart_tx_flush(unsigned int idx)
 {
 	struct pl011_uart *regs = uart_platform_baseptr(idx);
 
@@ -26,7 +26,7 @@ void uart_tx_flush(int idx)
 		;
 }
 
-unsigned char uart_rx_byte(int idx)
+unsigned char uart_rx_byte(unsigned int idx)
 {
 	struct pl011_uart *regs = uart_platform_baseptr(idx);
 

src/drivers/uart/sifive.c

@@ -45,7 +45,7 @@ static void sifive_uart_init(struct sifive_uart_registers *regs, int div)
 	write32(&regs->rxctrl, RXCTRL_RXEN|RXCTRL_RXCNT(0));
 }
 
-void uart_init(int idx)
+void uart_init(unsigned int idx)
 {
 	unsigned int div;
 	div = uart_baudrate_divisor(get_uart_baudrate(),
@@ -58,7 +58,7 @@ static bool uart_can_tx(struct sifive_uart_registers *regs)
 	return !(read32(&regs->txdata) & TXDATA_FULL);
 }
 
-void uart_tx_byte(int idx, unsigned char data)
+void uart_tx_byte(unsigned int idx, unsigned char data)
 {
 	struct sifive_uart_registers *regs = uart_platform_baseptr(idx);
 
@@ -68,7 +68,7 @@ void uart_tx_byte(int idx, unsigned char data)
 	write32(&regs->txdata, data);
 }
 
-void uart_tx_flush(int idx)
+void uart_tx_flush(unsigned int idx)
 {
 	struct sifive_uart_registers *regs = uart_platform_baseptr(idx);
 	uint32_t ip;
@@ -79,7 +79,7 @@ void uart_tx_flush(int idx)
 	} while (!(ip & IP_TXWM));
 }
 
-unsigned char uart_rx_byte(int idx)
+unsigned char uart_rx_byte(unsigned int idx)
 {
 	struct sifive_uart_registers *regs = uart_platform_baseptr(idx);
 	uint32_t rxdata;

src/drivers/uart/uart8250io.c

@@ -77,14 +77,14 @@ static void uart8250_init(unsigned int base_port, unsigned int divisor)
 
 static const unsigned int bases[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
 
-uintptr_t uart_platform_base(int idx)
+uintptr_t uart_platform_base(unsigned int idx)
 {
 	if (idx < ARRAY_SIZE(bases))
 		return bases[idx];
 	return 0;
 }
 
-void uart_init(int idx)
+void uart_init(unsigned int idx)
 {
 	if (!CONFIG(DRIVERS_UART_8250IO_SKIP_INIT)) {
 		unsigned int div;
@@ -94,17 +94,17 @@ void uart_init(int idx)
 	}
 }
 
-void uart_tx_byte(int idx, unsigned char data)
+void uart_tx_byte(unsigned int idx, unsigned char data)
 {
 	uart8250_tx_byte(uart_platform_base(idx), data);
 }
 
-unsigned char uart_rx_byte(int idx)
+unsigned char uart_rx_byte(unsigned int idx)
 {
 	return uart8250_rx_byte(uart_platform_base(idx));
 }
 
-void uart_tx_flush(int idx)
+void uart_tx_flush(unsigned int idx)
 {
 	uart8250_tx_flush(uart_platform_base(idx));
 }

src/drivers/uart/uart8250mem.c

@@ -97,7 +97,7 @@ static void uart8250_mem_init(void *base, unsigned int divisor)
 	uart8250_write(base, UART8250_LCR, CONFIG_TTYS0_LCS);
 }
 
-void uart_init(int idx)
+void uart_init(unsigned int idx)
 {
 	void *base = uart_platform_baseptr(idx);
 	if (!base)
@@ -109,7 +109,7 @@ void uart_init(int idx)
 	uart8250_mem_init(base, div);
 }
 
-void uart_tx_byte(int idx, unsigned char data)
+void uart_tx_byte(unsigned int idx, unsigned char data)
 {
 	void *base = uart_platform_baseptr(idx);
 	if (!base)
@@ -117,7 +117,7 @@ void uart_tx_byte(int idx, unsigned char data)
 	uart8250_mem_tx_byte(base, data);
 }
 
-unsigned char uart_rx_byte(int idx)
+unsigned char uart_rx_byte(unsigned int idx)
 {
 	void *base = uart_platform_baseptr(idx);
 	if (!base)
@@ -125,7 +125,7 @@ unsigned char uart_rx_byte(int idx)
 	return uart8250_mem_rx_byte(base);
 }
 
-void uart_tx_flush(int idx)
+void uart_tx_flush(unsigned int idx)
 {
 	void *base = uart_platform_baseptr(idx);
 	if (!base)