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path: root/drivers/tty/serial/samsung_tty.c
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Diffstat (limited to 'drivers/tty/serial/samsung_tty.c')
-rw-r--r--drivers/tty/serial/samsung_tty.c84
1 files changed, 68 insertions, 16 deletions
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 73f951d65b93..d913d9b2762a 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -154,10 +154,33 @@ struct s3c24xx_uart_port {
#define portaddrl(port, reg) \
((unsigned long *)(unsigned long)((port)->membase + (reg)))
-#define rd_regb(port, reg) (readb_relaxed(portaddr(port, reg)))
+static u32 rd_reg(struct uart_port *port, u32 reg)
+{
+ switch (port->iotype) {
+ case UPIO_MEM:
+ return readb_relaxed(portaddr(port, reg));
+ case UPIO_MEM32:
+ return readl_relaxed(portaddr(port, reg));
+ default:
+ return 0;
+ }
+ return 0;
+}
+
#define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
-#define wr_regb(port, reg, val) writeb_relaxed(val, portaddr(port, reg))
+static void wr_reg(struct uart_port *port, u32 reg, u32 val)
+{
+ switch (port->iotype) {
+ case UPIO_MEM:
+ writeb_relaxed(val, portaddr(port, reg));
+ break;
+ case UPIO_MEM32:
+ writel_relaxed(val, portaddr(port, reg));
+ break;
+ }
+}
+
#define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
/* Byte-order aware bit setting/clearing functions. */
@@ -714,7 +737,7 @@ static void s3c24xx_serial_rx_drain_fifo(struct s3c24xx_uart_port *ourport)
fifocnt--;
uerstat = rd_regl(port, S3C2410_UERSTAT);
- ch = rd_regb(port, S3C2410_URXH);
+ ch = rd_reg(port, S3C2410_URXH);
if (port->flags & UPF_CONS_FLOW) {
int txe = s3c24xx_serial_txempty_nofifo(port);
@@ -826,7 +849,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
}
if (port->x_char) {
- wr_regb(port, S3C2410_UTXH, port->x_char);
+ wr_reg(port, S3C2410_UTXH, port->x_char);
port->icount.tx++;
port->x_char = 0;
goto out;
@@ -852,7 +875,7 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
break;
- wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+ wr_reg(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
count--;
@@ -916,7 +939,7 @@ static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
/* no modem control lines */
static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
{
- unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
+ unsigned int umstat = rd_reg(port, S3C2410_UMSTAT);
if (umstat & S3C2410_UMSTAT_CTS)
return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
@@ -1281,14 +1304,14 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
struct s3c24xx_uart_info *info = ourport->info;
struct clk *clk;
unsigned long rate;
- unsigned int cnt, baud, quot, clk_sel, best_quot = 0;
+ unsigned int cnt, baud, quot, best_quot = 0;
char clkname[MAX_CLK_NAME_LENGTH];
int calc_deviation, deviation = (1 << 30) - 1;
- clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel :
- ourport->info->def_clk_sel;
for (cnt = 0; cnt < info->num_clks; cnt++) {
- if (!(clk_sel & (1 << cnt)))
+ /* Keep selected clock if provided */
+ if (ourport->cfg->clk_sel &&
+ !(ourport->cfg->clk_sel & (1 << cnt)))
continue;
sprintf(clkname, "clk_uart_baud%d", cnt);
@@ -1974,7 +1997,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct s3c24xx_uart_port *ourport;
int index = probe_index;
- int ret;
+ int ret, prop = 0;
if (np) {
ret = of_alias_get_id(np, "serial");
@@ -2000,10 +2023,27 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
dev_get_platdata(&pdev->dev) :
ourport->drv_data->def_cfg;
- if (np)
+ if (np) {
of_property_read_u32(np,
"samsung,uart-fifosize", &ourport->port.fifosize);
+ if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
+ switch (prop) {
+ case 1:
+ ourport->port.iotype = UPIO_MEM;
+ break;
+ case 4:
+ ourport->port.iotype = UPIO_MEM32;
+ break;
+ default:
+ dev_warn(&pdev->dev, "unsupported reg-io-width (%d)\n",
+ prop);
+ ret = -EINVAL;
+ break;
+ }
+ }
+ }
+
if (ourport->drv_data->fifosize[index])
ourport->port.fifosize = ourport->drv_data->fifosize[index];
else if (ourport->info->fifosize)
@@ -2185,7 +2225,7 @@ static int s3c24xx_serial_get_poll_char(struct uart_port *port)
if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
return NO_POLL_CHAR;
- return rd_regb(port, S3C2410_URXH);
+ return rd_reg(port, S3C2410_URXH);
}
static void s3c24xx_serial_put_poll_char(struct uart_port *port,
@@ -2200,7 +2240,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
while (!s3c24xx_serial_console_txrdy(port, ufcon))
cpu_relax();
- wr_regb(port, S3C2410_UTXH, c);
+ wr_reg(port, S3C2410_UTXH, c);
}
#endif /* CONFIG_CONSOLE_POLL */
@@ -2212,7 +2252,7 @@ s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
while (!s3c24xx_serial_console_txrdy(port, ufcon))
cpu_relax();
- wr_regb(port, S3C2410_UTXH, ch);
+ wr_reg(port, S3C2410_UTXH, ch);
}
static void
@@ -2587,6 +2627,18 @@ module_platform_driver(samsung_serial_driver);
* Early console.
*/
+static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
+{
+ switch (port->iotype) {
+ case UPIO_MEM:
+ writeb(val, portaddr(port, reg));
+ break;
+ case UPIO_MEM32:
+ writel(val, portaddr(port, reg));
+ break;
+ }
+}
+
struct samsung_early_console_data {
u32 txfull_mask;
};
@@ -2612,7 +2664,7 @@ static void samsung_early_putc(struct uart_port *port, int c)
else
samsung_early_busyuart(port);
- writeb(c, port->membase + S3C2410_UTXH);
+ wr_reg_barrier(port, S3C2410_UTXH, c);
}
static void samsung_early_write(struct console *con, const char *s,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 20:06:39 +0000