linux-kernel - [PATCH v2 03/19] tty: serial: samsung: prepare for different IO types

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Date: Fri, 19 Jan 2024 10:45:10 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: alim.akhtar@...sung.com,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	peter.griffin@...aro.org,
	semen.protsenko@...aro.org,
	willmcvicker@...gle.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 03/19] tty: serial: samsung: prepare for different IO types

GS101's Connectivity Peripheral blocks (peric0/1 blocks) which
include the I3C and USI (I2C, SPI, UART) only allow 32-bit
register accesses. If using 8-bit register accesses, a SError
Interrupt is raised causing the system unusable.

Instead of specifying the reg-io-width = 4 everywhere, for each node,
the requirement should be deduced from the compatible.

Prepare the samsung tty driver to allow IO types different than
UPIO_MEM. ``struct uart_port::iotype`` is an unsigned char where all
its 8 bits are exposed to uapi. We can't make NULL checks on it to
verify if it's set, thus always set it from the driver's data.
Use u8 for the ``iotype`` member of ``struct s3c24xx_uart_info`` to
emphasize that the iotype is an 8 bit mask.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/tty/serial/samsung_tty.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 6fdb32b83346..9d3767021f9c 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -84,6 +84,7 @@ struct s3c24xx_uart_info {
 	unsigned long		clksel_mask;
 	unsigned long		clksel_shift;
 	unsigned long		ucon_mask;
+	u8			iotype;
 
 	/* uart port features */
 
@@ -1741,7 +1742,6 @@ static void s3c24xx_serial_init_port_default(int index) {
 
 	spin_lock_init(&port->lock);
 
-	port->iotype = UPIO_MEM;
 	port->uartclk = 0;
 	port->fifosize = 16;
 	port->flags = UPF_BOOT_AUTOCONF;
@@ -1988,6 +1988,8 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 		break;
 	}
 
+	ourport->port.iotype = ourport->info->iotype;
+
 	if (np) {
 		of_property_read_u32(np,
 			"samsung,uart-fifosize", &ourport->port.fifosize);
@@ -2398,6 +2400,7 @@ static const struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
 		.name		= "Samsung S3C6400 UART",
 		.type		= TYPE_S3C6400,
 		.port_type	= PORT_S3C6400,
+		.iotype		= UPIO_MEM,
 		.fifosize	= 64,
 		.has_divslot	= 1,
 		.rx_fifomask	= S3C2440_UFSTAT_RXMASK,
@@ -2427,6 +2430,7 @@ static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 		.name		= "Samsung S5PV210 UART",
 		.type		= TYPE_S3C6400,
 		.port_type	= PORT_S3C6400,
+		.iotype		= UPIO_MEM,
 		.has_divslot	= 1,
 		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,
 		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,
@@ -2456,6 +2460,7 @@ static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 		.name		= "Samsung Exynos UART",	\
 		.type		= TYPE_S3C6400,			\
 		.port_type	= PORT_S3C6400,			\
+		.iotype		= UPIO_MEM,			\
 		.has_divslot	= 1,				\
 		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,	\
 		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,	\
@@ -2516,6 +2521,7 @@ static const struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
 		.name		= "Apple S5L UART",
 		.type		= TYPE_APPLE_S5L,
 		.port_type	= PORT_8250,
+		.iotype		= UPIO_MEM,
 		.fifosize	= 16,
 		.rx_fifomask	= S3C2410_UFSTAT_RXMASK,
 		.rx_fifoshift	= S3C2410_UFSTAT_RXSHIFT,
@@ -2545,6 +2551,7 @@ static const struct s3c24xx_serial_drv_data artpec8_serial_drv_data = {
 		.name		= "Axis ARTPEC-8 UART",
 		.type		= TYPE_S3C6400,
 		.port_type	= PORT_S3C6400,
+		.iotype		= UPIO_MEM,
 		.fifosize	= 64,
 		.has_divslot	= 1,
 		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,
-- 
2.43.0.429.g432eaa2c6b-goog