diff options
author | Anton Vorontsov <cbouatmailru@gmail.com> | 2010-10-01 17:21:54 +0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:20:07 -0700 |
commit | 0d426eda7c94d864ead913f7099c623521368443 (patch) | |
tree | 97e8b817078c87bb26be2d8389daa4f063c0decd | |
parent | 6b5756f176568a710d008d3b478128fafb6707f0 (diff) | |
download | kernel_samsung_smdk4412-0d426eda7c94d864ead913f7099c623521368443.zip kernel_samsung_smdk4412-0d426eda7c94d864ead913f7099c623521368443.tar.gz kernel_samsung_smdk4412-0d426eda7c94d864ead913f7099c623521368443.tar.bz2 |
altera_uart: Add support for different address strides
Some controllers implement registers with a stride, to support
those we must implement the proper IO accessors.
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Acked-by: Tobias Klauser <tklauser@distanz.ch>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/serial/altera_uart.c | 58 | ||||
-rw-r--r-- | include/linux/altera_uart.h | 1 |
2 files changed, 38 insertions, 21 deletions
diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c index 1dfeffa..f1985aa 100644 --- a/drivers/serial/altera_uart.c +++ b/drivers/serial/altera_uart.c @@ -82,9 +82,23 @@ struct altera_uart { unsigned short imr; /* Local IMR mirror */ }; +static u32 altera_uart_readl(struct uart_port *port, int reg) +{ + struct altera_uart_platform_uart *platp = port->private_data; + + return readl(port->membase + (reg << platp->bus_shift)); +} + +static void altera_uart_writel(struct uart_port *port, u32 dat, int reg) +{ + struct altera_uart_platform_uart *platp = port->private_data; + + writel(dat, port->membase + (reg << platp->bus_shift)); +} + static unsigned int altera_uart_tx_empty(struct uart_port *port) { - return (readl(port->membase + ALTERA_UART_STATUS_REG) & + return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0; } @@ -93,8 +107,7 @@ static unsigned int altera_uart_get_mctrl(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); unsigned int sigs; - sigs = - (readl(port->membase + ALTERA_UART_STATUS_REG) & + sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0; sigs |= (pp->sigs & TIOCM_RTS); @@ -110,7 +123,7 @@ static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs) pp->imr |= ALTERA_UART_CONTROL_RTS_MSK; else pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } static void altera_uart_start_tx(struct uart_port *port) @@ -118,7 +131,7 @@ static void altera_uart_start_tx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } static void altera_uart_stop_tx(struct uart_port *port) @@ -126,7 +139,7 @@ static void altera_uart_stop_tx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } static void altera_uart_stop_rx(struct uart_port *port) @@ -134,7 +147,7 @@ static void altera_uart_stop_rx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } static void altera_uart_break_ctl(struct uart_port *port, int break_state) @@ -147,7 +160,7 @@ static void altera_uart_break_ctl(struct uart_port *port, int break_state) pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK; else pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); spin_unlock_irqrestore(&port->lock, flags); } @@ -171,7 +184,7 @@ static void altera_uart_set_termios(struct uart_port *port, spin_lock_irqsave(&port->lock, flags); uart_update_timeout(port, termios->c_cflag, baud); - writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG); + altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG); spin_unlock_irqrestore(&port->lock, flags); } @@ -181,14 +194,15 @@ static void altera_uart_rx_chars(struct altera_uart *pp) unsigned char ch, flag; unsigned short status; - while ((status = readl(port->membase + ALTERA_UART_STATUS_REG)) & + while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) & ALTERA_UART_STATUS_RRDY_MSK) { - ch = readl(port->membase + ALTERA_UART_RXDATA_REG); + ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG); flag = TTY_NORMAL; port->icount.rx++; if (status & ALTERA_UART_STATUS_E_MSK) { - writel(status, port->membase + ALTERA_UART_STATUS_REG); + altera_uart_writel(port, status, + ALTERA_UART_STATUS_REG); if (status & ALTERA_UART_STATUS_BRK_MSK) { port->icount.brk++; @@ -228,18 +242,18 @@ static void altera_uart_tx_chars(struct altera_uart *pp) if (port->x_char) { /* Send special char - probably flow control */ - writel(port->x_char, port->membase + ALTERA_UART_TXDATA_REG); + altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG); port->x_char = 0; port->icount.tx++; return; } - while (readl(port->membase + ALTERA_UART_STATUS_REG) & + while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TRDY_MSK) { if (xmit->head == xmit->tail) break; - writel(xmit->buf[xmit->tail], - port->membase + ALTERA_UART_TXDATA_REG); + altera_uart_writel(port, xmit->buf[xmit->tail], + ALTERA_UART_TXDATA_REG); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; } @@ -249,7 +263,7 @@ static void altera_uart_tx_chars(struct altera_uart *pp) if (xmit->head == xmit->tail) { pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } } @@ -259,7 +273,7 @@ static irqreturn_t altera_uart_interrupt(int irq, void *data) struct altera_uart *pp = container_of(port, struct altera_uart, port); unsigned int isr; - isr = readl(port->membase + ALTERA_UART_STATUS_REG) & pp->imr; + isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr; spin_lock(&port->lock); if (isr & ALTERA_UART_STATUS_RRDY_MSK) @@ -285,9 +299,9 @@ static void altera_uart_config_port(struct uart_port *port, int flags) port->type = PORT_ALTERA_UART; /* Clear mask, so no surprise interrupts. */ - writel(0, port->membase + ALTERA_UART_CONTROL_REG); + altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG); /* Clear status register */ - writel(0, port->membase + ALTERA_UART_STATUS_REG); + altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG); } static int altera_uart_startup(struct uart_port *port) @@ -407,6 +421,7 @@ int __init early_altera_uart_setup(struct altera_uart_platform_uart *platp) port->uartclk = platp[i].uartclk; port->flags = ASYNC_BOOT_AUTOCONF; port->ops = &altera_uart_ops; + port->private_data = platp; } return 0; @@ -414,7 +429,7 @@ int __init early_altera_uart_setup(struct altera_uart_platform_uart *platp) static void altera_uart_console_putc(struct uart_port *port, const char c) { - while (!(readl(port->membase + ALTERA_UART_STATUS_REG) & + while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TRDY_MSK)) cpu_relax(); @@ -535,6 +550,7 @@ static int __devinit altera_uart_probe(struct platform_device *pdev) port->uartclk = platp->uartclk; port->ops = &altera_uart_ops; port->flags = ASYNC_BOOT_AUTOCONF; + port->private_data = platp; uart_add_one_port(&altera_uart_driver, port); diff --git a/include/linux/altera_uart.h b/include/linux/altera_uart.h index 8d44106..c022c82 100644 --- a/include/linux/altera_uart.h +++ b/include/linux/altera_uart.h @@ -9,6 +9,7 @@ struct altera_uart_platform_uart { unsigned long mapbase; /* Physical address base */ unsigned int irq; /* Interrupt vector */ unsigned int uartclk; /* UART clock rate */ + unsigned int bus_shift; /* Bus shift (address stride) */ }; #endif /* __ALTUART_H */ |