diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sccnxp.c | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c index 339befdd2f4d..c0a68eee4479 100644 --- a/drivers/tty/serial/sccnxp.c +++ b/drivers/tty/serial/sccnxp.c @@ -12,6 +12,7 @@ #endif #include <linux/clk.h> +#include <linux/delay.h> #include <linux/err.h> #include <linux/module.h> #include <linux/mod_devicetable.h> @@ -103,6 +104,8 @@ struct sccnxp_chip { unsigned long freq_max; unsigned int flags; unsigned int fifosize; + /* Time between read/write cycles */ + unsigned int trwd; }; struct sccnxp_port { @@ -137,6 +140,7 @@ static const struct sccnxp_chip sc2681 = { .freq_max = 4000000, .flags = SCCNXP_HAVE_IO, .fifosize = 3, + .trwd = 200, }; static const struct sccnxp_chip sc2691 = { @@ -147,6 +151,7 @@ static const struct sccnxp_chip sc2691 = { .freq_max = 4000000, .flags = 0, .fifosize = 3, + .trwd = 150, }; static const struct sccnxp_chip sc2692 = { @@ -157,6 +162,7 @@ static const struct sccnxp_chip sc2692 = { .freq_max = 4000000, .flags = SCCNXP_HAVE_IO, .fifosize = 3, + .trwd = 30, }; static const struct sccnxp_chip sc2891 = { @@ -167,6 +173,7 @@ static const struct sccnxp_chip sc2891 = { .freq_max = 8000000, .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, .fifosize = 16, + .trwd = 27, }; static const struct sccnxp_chip sc2892 = { @@ -177,6 +184,7 @@ static const struct sccnxp_chip sc2892 = { .freq_max = 8000000, .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, .fifosize = 16, + .trwd = 17, }; static const struct sccnxp_chip sc28202 = { @@ -187,6 +195,7 @@ static const struct sccnxp_chip sc28202 = { .freq_max = 50000000, .flags = SCCNXP_HAVE_IO | SCCNXP_HAVE_MR0, .fifosize = 256, + .trwd = 10, }; static const struct sccnxp_chip sc68681 = { @@ -197,6 +206,7 @@ static const struct sccnxp_chip sc68681 = { .freq_max = 4000000, .flags = SCCNXP_HAVE_IO, .fifosize = 3, + .trwd = 200, }; static const struct sccnxp_chip sc68692 = { @@ -207,24 +217,36 @@ static const struct sccnxp_chip sc68692 = { .freq_max = 4000000, .flags = SCCNXP_HAVE_IO, .fifosize = 3, + .trwd = 200, }; -static inline u8 sccnxp_read(struct uart_port *port, u8 reg) +static u8 sccnxp_read(struct uart_port *port, u8 reg) { - return readb(port->membase + (reg << port->regshift)); + struct sccnxp_port *s = dev_get_drvdata(port->dev); + u8 ret; + + ret = readb(port->membase + (reg << port->regshift)); + + ndelay(s->chip->trwd); + + return ret; } -static inline void sccnxp_write(struct uart_port *port, u8 reg, u8 v) +static void sccnxp_write(struct uart_port *port, u8 reg, u8 v) { + struct sccnxp_port *s = dev_get_drvdata(port->dev); + writeb(v, port->membase + (reg << port->regshift)); + + ndelay(s->chip->trwd); } -static inline u8 sccnxp_port_read(struct uart_port *port, u8 reg) +static u8 sccnxp_port_read(struct uart_port *port, u8 reg) { return sccnxp_read(port, (port->line << 3) + reg); } -static inline void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v) +static void sccnxp_port_write(struct uart_port *port, u8 reg, u8 v) { sccnxp_write(port, (port->line << 3) + reg, v); } |