| Message ID | 20200403102041.22015-1-hyunki00.koo@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] tty: samsung_tty: 32-bit access for TX/RX hold registers | expand |
On Fri, Apr 03, 2020 at 07:20:41PM +0900, Hyunki Koo wrote: > Support 32-bit access for the TX/RX hold registers UTXH and URXH. > > This is required for some newer SoCs. > > Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> > --- > v3: change rd_regl to rd_reg in line 954 for backward compatibility. I cannot find this change against v2. > --- > > drivers/tty/serial/samsung_tty.c | 76 +++++++++++++++++++++++++++++++++------- > 1 file changed, 64 insertions(+), 12 deletions(-) > > diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c > index 73f951d65b93..a674a80163ed 100644 > --- a/drivers/tty/serial/samsung_tty.c > +++ b/drivers/tty/serial/samsung_tty.c > @@ -154,12 +154,47 @@ 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 unsigned int rd_reg(struct uart_port *port, int reg) You should return here u32 to be consistent with readl_relaxed. > +{ > + 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, int reg, int val) val should be u32. > +{ > + 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)) > > +static void write_buf(struct uart_port *port, int reg, int val) buf is misleading, you do not write here any buffer. Maybe "wr_reg_barrier()" or "wr_reg_order()"? Best regards, Krzysztof
On Thu, Apr 02, 2020 at 7:48:38PM +0900, Krzysztof Kozlowski > On Fri, Apr 03, 2020 at 07:20:41PM +0900, Hyunki Koo wrote: > > Support 32-bit access for the TX/RX hold registers UTXH and URXH. > > > > This is required for some newer SoCs. > > > > Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> > > --- > > v3: change rd_regl to rd_reg in line 954 for backward compatibility. > > I cannot find this change against v2. Okay, I will add all changes. > > > --- > > > > drivers/tty/serial/samsung_tty.c | 76 > > +++++++++++++++++++++++++++++++++------- > > 1 file changed, 64 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/tty/serial/samsung_tty.c > > b/drivers/tty/serial/samsung_tty.c > > index 73f951d65b93..a674a80163ed 100644 > > --- a/drivers/tty/serial/samsung_tty.c > > +++ b/drivers/tty/serial/samsung_tty.c > > @@ -154,12 +154,47 @@ 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 unsigned int rd_reg(struct uart_port *port, int reg) > > You should return here u32 to be consistent with readl_relaxed. > > > +{ > > + 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, int reg, int val) > > val should be u32. Okay, I will apply it. > > > +{ > > + 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)) > > > > +static void write_buf(struct uart_port *port, int reg, int val) > > buf is misleading, you do not write here any buffer. Maybe > "wr_reg_barrier()" or "wr_reg_order()"? Okay, wr_reg_barrier would be good, I will apply it. > > Best regards, > Krzysztof
On Fri, Apr 03, 2020 at 08:12:55PM +0900, Hyunki Koo wrote: > On Thu, Apr 02, 2020 at 7:48:38PM +0900, Krzysztof Kozlowski > > On Fri, Apr 03, 2020 at 07:20:41PM +0900, Hyunki Koo wrote: > > > Support 32-bit access for the TX/RX hold registers UTXH and URXH. > > > > > > This is required for some newer SoCs. > > > > > > Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> > > > --- > > > v3: change rd_regl to rd_reg in line 954 for backward compatibility. > > > > I cannot find this change against v2. > Okay, I will add all changes. No, I mean, I cannot find the change rd_regl->rd_reg around line 954. There was no changes around line 954 in v2. Best regards, Krzysztof
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index 73f951d65b93..a674a80163ed 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -154,12 +154,47 @@ 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 unsigned int rd_reg(struct uart_port *port, int 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, int reg, int 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)) +static void write_buf(struct uart_port *port, int reg, int val) +{ + switch (port->iotype) { + case UPIO_MEM: + writeb(val, portaddr(port, reg)); + break; + case UPIO_MEM32: + writel(val, portaddr(port, reg)); + break; + } +} + /* Byte-order aware bit setting/clearing functions. */ static inline void s3c24xx_set_bit(struct uart_port *port, int idx, @@ -714,7 +749,7 @@ 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 +861,7 @@ 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 +887,7 @@ 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 +951,7 @@ 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; @@ -1974,7 +2009,7 @@ 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 +2035,27 @@ 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 +2237,7 @@ 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 +2252,7 @@ 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 +2264,7 @@ 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 @@ -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); + write_buf(port, S3C2410_UTXH, c); } static void samsung_early_write(struct console *con, const char *s,
Support 32-bit access for the TX/RX hold registers UTXH and URXH. This is required for some newer SoCs. Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> --- v3: change rd_regl to rd_reg in line 954 for backward compatibility. --- drivers/tty/serial/samsung_tty.c | 76 +++++++++++++++++++++++++++++++++------- 1 file changed, 64 insertions(+), 12 deletions(-)