[PATCH v2 18/25] tty: serial: samsung_tty: add s3c24xx_port_type

From: Hector Martin
Date: Mon Feb 15 2021 - 07:25:21 EST

This decouples the TTY layer PORT_ types, which are exposed to
userspace, from the driver-internal flag of what kind of port this is.

This removes s3c24xx_serial_has_interrupt_mask, which was just checking
for a specific type anyway, and adds the ucon_mask port info member to
avoid having S3C2440 as a distinct type.

Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
---
drivers/tty/serial/samsung_tty.c | 131 ++++++++++++++++++-------------
1 file changed, 77 insertions(+), 54 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 6b661f3ec1ae..21955be680a4 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -56,9 +56,15 @@
/* flag to ignore all characters coming in */
#define RXSTAT_DUMMY_READ (0x10000000)

+enum s3c24xx_port_type {
+ TYPE_S3C24XX,
+ TYPE_S3C6400,
+};
+
struct s3c24xx_uart_info {
char *name;
- unsigned int type;
+ enum s3c24xx_port_type type;
+ unsigned int port_type;
unsigned int fifosize;
unsigned long rx_fifomask;
unsigned long rx_fifoshift;
@@ -70,6 +76,7 @@ struct s3c24xx_uart_info {
unsigned long num_clks;
unsigned long clksel_mask;
unsigned long clksel_shift;
+ unsigned long ucon_mask;

/* uart port features */

@@ -228,16 +235,6 @@ static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
}

-/*
- * s3c64xx and later SoC's include the interrupt mask and status registers in
- * the controller itself, unlike the s3c24xx SoC's which have these registers
- * in the interrupt controller. Check if the port type is s3c64xx or higher.
- */
-static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
-{
- return to_ourport(port)->info->type == PORT_S3C6400;
-}
-
static void s3c24xx_serial_rx_enable(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
@@ -289,10 +286,14 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
if (!ourport->tx_enabled)
return;

- if (s3c24xx_serial_has_interrupt_mask(port))
+ switch (ourport->info->type) {
+ case TYPE_S3C6400:
s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
- else
+ break;
+ default:
disable_irq_nosync(ourport->tx_irq);
+ break;
+ }

if (dma && dma->tx_chan && ourport->tx_in_progress == S3C24XX_TX_DMA) {
dmaengine_pause(dma->tx_chan);
@@ -353,10 +354,14 @@ static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
u32 ucon;

/* Mask Tx interrupt */
- if (s3c24xx_serial_has_interrupt_mask(port))
+ switch (ourport->info->type) {
+ case TYPE_S3C6400:
s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
- else
+ break;
+ default:
disable_irq_nosync(ourport->tx_irq);
+ break;
+ }

/* Enable tx dma mode */
ucon = rd_regl(port, S3C2410_UCON);
@@ -386,11 +391,14 @@ static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
wr_regl(port, S3C2410_UCON, ucon);

/* Unmask Tx interrupt */
- if (s3c24xx_serial_has_interrupt_mask(port))
- s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
- S3C64XX_UINTM);
- else
+ switch (ourport->info->type) {
+ case TYPE_S3C6400:
+ s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
+ break;
+ default:
enable_irq(ourport->tx_irq);
+ break;
+ }

ourport->tx_mode = S3C24XX_TX_PIO;
}
@@ -513,11 +521,14 @@ static void s3c24xx_serial_stop_rx(struct uart_port *port)

if (ourport->rx_enabled) {
dev_dbg(port->dev, "stopping rx\n");
- if (s3c24xx_serial_has_interrupt_mask(port))
- s3c24xx_set_bit(port, S3C64XX_UINTM_RXD,
- S3C64XX_UINTM);
- else
- disable_irq_nosync(ourport->rx_irq);
+ switch (ourport->info->type) {
+ case TYPE_S3C6400:
+ s3c24xx_set_bit(port, S3C64XX_UINTM_RXD, S3C64XX_UINTM);
+ break;
+ default:
+ disable_irq_nosync(ourport->tx_irq);
+ break;
+ }
ourport->rx_enabled = 0;
}
if (dma && dma->rx_chan) {
@@ -1542,14 +1553,12 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,

static const char *s3c24xx_serial_type(struct uart_port *port)
{
- switch (port->type) {
- case PORT_S3C2410:
- return "S3C2410";
- case PORT_S3C2440:
- return "S3C2440";
- case PORT_S3C2412:
- return "S3C2412";
- case PORT_S3C6400:
+ struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+ switch (ourport->info->type) {
+ case TYPE_S3C24XX:
+ return "S3C24XX";
+ case TYPE_S3C6400:
return "S3C6400/10";
default:
return NULL;
@@ -1576,7 +1585,7 @@ static void s3c24xx_serial_config_port(struct uart_port *port, int flags)

if (flags & UART_CONFIG_TYPE &&
s3c24xx_serial_request_port(port) == 0)
- port->type = info->type;
+ port->type = info->port_type;
}

/*
@@ -1587,7 +1596,7 @@ s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);

- if (ser->type != PORT_UNKNOWN && ser->type != info->type)
+ if (ser->type != PORT_UNKNOWN && ser->type != info->port_type)
return -EINVAL;

return 0;
@@ -1736,14 +1745,9 @@ static void s3c24xx_serial_resetport(struct uart_port *port,
{
struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
unsigned long ucon = rd_regl(port, S3C2410_UCON);
- unsigned int ucon_mask;

- ucon_mask = info->clksel_mask;
- if (info->type == PORT_S3C2440)
- ucon_mask |= S3C2440_UCON0_DIVMASK;
-
- ucon &= ucon_mask;
- wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
+ ucon &= (info->clksel_mask | info->ucon_mask);
+ wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);

/* reset both fifos */
wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
@@ -1931,11 +1935,16 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
ourport->tx_irq = ret + 1;
}

- if (!s3c24xx_serial_has_interrupt_mask(port)) {
+ switch (ourport->info->type) {
+ case TYPE_S3C24XX:
ret = platform_get_irq(platdev, 1);
if (ret > 0)
ourport->tx_irq = ret;
+ break;
+ default:
+ break;
}
+
/*
* DMA is currently supported only on DT platforms, if DMA properties
* are specified.
@@ -1971,10 +1980,14 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
pr_warn("uart: failed to enable baudclk\n");

/* Keep all interrupts masked and cleared */
- if (s3c24xx_serial_has_interrupt_mask(port)) {
+ switch (ourport->info->type) {
+ case TYPE_S3C6400:
wr_regl(port, S3C64XX_UINTM, 0xf);
wr_regl(port, S3C64XX_UINTP, 0xf);
wr_regl(port, S3C64XX_UINTSP, 0xf);
+ break;
+ default:
+ break;
}

dev_dbg(port->dev, "port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
@@ -2046,12 +2059,10 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
ourport->drv_data->def_cfg;

switch (ourport->info->type) {
- case PORT_S3C2410:
- case PORT_S3C2412:
- case PORT_S3C2440:
+ case TYPE_S3C24XX:
ourport->port.ops = &s3c24xx_serial_ops;
break;
- case PORT_S3C6400:
+ case TYPE_S3C6400:
ourport->port.ops = &s3c64xx_serial_ops;
break;
}
@@ -2179,7 +2190,8 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)

if (port) {
/* restore IRQ mask */
- if (s3c24xx_serial_has_interrupt_mask(port)) {
+ switch (ourport->info->type) {
+ case TYPE_S3C6400: {
unsigned int uintm = 0xf;

if (ourport->tx_enabled)
@@ -2193,6 +2205,10 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
if (!IS_ERR(ourport->baudclk))
clk_disable_unprepare(ourport->baudclk);
clk_disable_unprepare(ourport->clk);
+ break;
+ }
+ default:
+ break;
}
}

@@ -2417,7 +2433,8 @@ static struct console s3c24xx_serial_console = {
static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
.info = &(struct s3c24xx_uart_info) {
.name = "Samsung S3C2410 UART",
- .type = PORT_S3C2410,
+ .type = TYPE_S3C24XX,
+ .port_type = PORT_S3C2410,
.fifosize = 16,
.rx_fifomask = S3C2410_UFSTAT_RXMASK,
.rx_fifoshift = S3C2410_UFSTAT_RXSHIFT,
@@ -2444,7 +2461,8 @@ static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
.info = &(struct s3c24xx_uart_info) {
.name = "Samsung S3C2412 UART",
- .type = PORT_S3C2412,
+ .type = TYPE_S3C24XX,
+ .port_type = PORT_S3C2412,
.fifosize = 64,
.has_divslot = 1,
.rx_fifomask = S3C2440_UFSTAT_RXMASK,
@@ -2473,7 +2491,8 @@ static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
.info = &(struct s3c24xx_uart_info) {
.name = "Samsung S3C2440 UART",
- .type = PORT_S3C2440,
+ .type = TYPE_S3C24XX,
+ .port_type = PORT_S3C2440,
.fifosize = 64,
.has_divslot = 1,
.rx_fifomask = S3C2440_UFSTAT_RXMASK,
@@ -2486,6 +2505,7 @@ static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
.num_clks = 4,
.clksel_mask = S3C2412_UCON_CLKMASK,
.clksel_shift = S3C2412_UCON_CLKSHIFT,
+ .ucon_mask = S3C2440_UCON0_DIVMASK,
},
.def_cfg = &(struct s3c2410_uartcfg) {
.ucon = S3C2410_UCON_DEFAULT,
@@ -2501,7 +2521,8 @@ static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
.info = &(struct s3c24xx_uart_info) {
.name = "Samsung S3C6400 UART",
- .type = PORT_S3C6400,
+ .type = TYPE_S3C6400,
+ .port_type = PORT_S3C6400,
.fifosize = 64,
.has_divslot = 1,
.rx_fifomask = S3C2440_UFSTAT_RXMASK,
@@ -2529,7 +2550,8 @@ static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
.info = &(struct s3c24xx_uart_info) {
.name = "Samsung S5PV210 UART",
- .type = PORT_S3C6400,
+ .type = TYPE_S3C6400,
+ .port_type = PORT_S3C6400,
.has_divslot = 1,
.rx_fifomask = S5PV210_UFSTAT_RXMASK,
.rx_fifoshift = S5PV210_UFSTAT_RXSHIFT,
@@ -2557,7 +2579,8 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
#define EXYNOS_COMMON_SERIAL_DRV_DATA \
.info = &(struct s3c24xx_uart_info) { \
.name = "Samsung Exynos UART", \
- .type = PORT_S3C6400, \
+ .type = TYPE_S3C6400, \
+ .port_type = PORT_S3C6400, \
.has_divslot = 1, \
.rx_fifomask = S5PV210_UFSTAT_RXMASK, \
.rx_fifoshift = S5PV210_UFSTAT_RXSHIFT, \
--
2.30.0