Commit 5bf5635a authored by Ludovic Desroches's avatar Ludovic Desroches Committed by Greg Kroah-Hartman

tty/serial: atmel: add fractional baud rate support

The USART device provides a fractional baud rate generator to get a more
accurate baud rate. It can be used only when the USART is configured in
'normal mode' and this feature is not available on AT91RM9200 SoC.
Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2426fbc7
...@@ -166,6 +166,7 @@ struct atmel_uart_port { ...@@ -166,6 +166,7 @@ struct atmel_uart_port {
u32 rts_low; u32 rts_low;
bool ms_irq_enabled; bool ms_irq_enabled;
u32 rtor; /* address of receiver timeout register if it exists */ u32 rtor; /* address of receiver timeout register if it exists */
bool has_frac_baudrate;
bool has_hw_timer; bool has_hw_timer;
struct timer_list uart_timer; struct timer_list uart_timer;
...@@ -1745,6 +1746,11 @@ static void atmel_get_ip_name(struct uart_port *port) ...@@ -1745,6 +1746,11 @@ static void atmel_get_ip_name(struct uart_port *port)
dbgu_uart = 0x44424755; /* DBGU */ dbgu_uart = 0x44424755; /* DBGU */
new_uart = 0x55415254; /* UART */ new_uart = 0x55415254; /* UART */
/*
* Only USART devices from at91sam9260 SOC implement fractional
* baudrate.
*/
atmel_port->has_frac_baudrate = false;
atmel_port->has_hw_timer = false; atmel_port->has_hw_timer = false;
if (name == new_uart) { if (name == new_uart) {
...@@ -1753,6 +1759,7 @@ static void atmel_get_ip_name(struct uart_port *port) ...@@ -1753,6 +1759,7 @@ static void atmel_get_ip_name(struct uart_port *port)
atmel_port->rtor = ATMEL_UA_RTOR; atmel_port->rtor = ATMEL_UA_RTOR;
} else if (name == usart) { } else if (name == usart) {
dev_dbg(port->dev, "Usart\n"); dev_dbg(port->dev, "Usart\n");
atmel_port->has_frac_baudrate = true;
atmel_port->has_hw_timer = true; atmel_port->has_hw_timer = true;
atmel_port->rtor = ATMEL_US_RTOR; atmel_port->rtor = ATMEL_US_RTOR;
} else if (name == dbgu_uart) { } else if (name == dbgu_uart) {
...@@ -1764,6 +1771,7 @@ static void atmel_get_ip_name(struct uart_port *port) ...@@ -1764,6 +1771,7 @@ static void atmel_get_ip_name(struct uart_port *port)
case 0x302: case 0x302:
case 0x10213: case 0x10213:
dev_dbg(port->dev, "This version is usart\n"); dev_dbg(port->dev, "This version is usart\n");
atmel_port->has_frac_baudrate = true;
atmel_port->has_hw_timer = true; atmel_port->has_hw_timer = true;
atmel_port->rtor = ATMEL_US_RTOR; atmel_port->rtor = ATMEL_US_RTOR;
break; break;
...@@ -2025,8 +2033,9 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, ...@@ -2025,8 +2033,9 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state,
static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old) struct ktermios *old)
{ {
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned long flags; unsigned long flags;
unsigned int old_mode, mode, imr, quot, baud; unsigned int old_mode, mode, imr, quot, baud, div, cd, fp = 0;
/* save the current mode register */ /* save the current mode register */
mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR); mode = old_mode = atmel_uart_readl(port, ATMEL_US_MR);
...@@ -2036,12 +2045,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, ...@@ -2036,12 +2045,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
ATMEL_US_PAR | ATMEL_US_USMODE); ATMEL_US_PAR | ATMEL_US_USMODE);
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
quot = uart_get_divisor(port, baud);
if (quot > 65535) { /* BRGR is 16-bit, so switch to slower clock */
quot /= 8;
mode |= ATMEL_US_USCLKS_MCK_DIV8;
}
/* byte size */ /* byte size */
switch (termios->c_cflag & CSIZE) { switch (termios->c_cflag & CSIZE) {
...@@ -2160,7 +2163,29 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, ...@@ -2160,7 +2163,29 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_CR, rts_state); atmel_uart_writel(port, ATMEL_US_CR, rts_state);
} }
/* set the baud rate */ /*
* Set the baud rate:
* Fractional baudrate allows to setup output frequency more
* accurately. This feature is enabled only when using normal mode.
* baudrate = selected clock / (8 * (2 - OVER) * (CD + FP / 8))
* Currently, OVER is always set to 0 so we get
* baudrate = selected clock (16 * (CD + FP / 8))
*/
if (atmel_port->has_frac_baudrate &&
(mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_NORMAL) {
div = DIV_ROUND_CLOSEST(port->uartclk, baud);
cd = div / 16;
fp = DIV_ROUND_CLOSEST(div % 16, 2);
} else {
cd = uart_get_divisor(port, baud);
}
if (cd > 65535) { /* BRGR is 16-bit, so switch to slower clock */
cd /= 8;
mode |= ATMEL_US_USCLKS_MCK_DIV8;
}
quot = cd | fp << ATMEL_US_FP_OFFSET;
atmel_uart_writel(port, ATMEL_US_BRGR, quot); atmel_uart_writel(port, ATMEL_US_BRGR, quot);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN); atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
......
...@@ -118,6 +118,7 @@ ...@@ -118,6 +118,7 @@
#define ATMEL_US_BRGR 0x20 /* Baud Rate Generator Register */ #define ATMEL_US_BRGR 0x20 /* Baud Rate Generator Register */
#define ATMEL_US_CD GENMASK(15, 0) /* Clock Divider */ #define ATMEL_US_CD GENMASK(15, 0) /* Clock Divider */
#define ATMEL_US_FP_OFFSET 16 /* Fractional Part */
#define ATMEL_US_RTOR 0x24 /* Receiver Time-out Register for USART */ #define ATMEL_US_RTOR 0x24 /* Receiver Time-out Register for USART */
#define ATMEL_UA_RTOR 0x28 /* Receiver Time-out Register for UART */ #define ATMEL_UA_RTOR 0x28 /* Receiver Time-out Register for UART */
......
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