diff options
| author | Zang Roy-r61911 <tie-fei.zang@freescale.com> | 2006-06-30 02:29:58 -0700 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-07-09 21:11:09 +0100 |
| commit | 3be91ec7388bae3cf1bfb4febcee5ab6c65f409f (patch) | |
| tree | cb2fa80f81321e0d1dda6e88ca95ade081064624 /drivers/serial/8250.c | |
| parent | c65b15cfd6b8b74c6f2b3635bf47ee661d351ef3 (diff) | |
[SERIAL] 8250: add tsi108 serial support
The following patch gets rid of CONFIG_TSI108_BRIDGE. I add UPIO_TSI to
handle IIR and IER register in serial_in and serial_out.
(1) the reason to rewrite serial_in:
TSI108 rev Z1 version ERRATA. Reading the UART's Interrupt
Identification Register (IIR) clears the Transmit Holding Register
Empty (THRE) and Transmit buffer Empty (TEMP) interrupts even if they
are not enabled in the Interrupt Enable Register (IER). This leads to
loss of the interrupts. Interrupts are not cleared when reading UART
registers as 32-bit word.
(2) the reason to rewrite serial_out:
Check for UART_IER_UUE bit in the autoconfig routine. This section
of autoconfig is excluded for Tsi108/109 because bits 7 and 6 are
reserved for internal use. They are R/W bits. In addition to
incorrect identification, changing these bits (from 00) will make
Tsi108/109 UART non-functional.
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 0995430e4cf..5443fcd3835 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -299,6 +299,7 @@ static inline int map_8250_out_reg(struct uart_8250_port *up, int offset) static unsigned int serial_in(struct uart_8250_port *up, int offset) { + unsigned int tmp; offset = map_8250_in_reg(up, offset) << up->port.regshift; switch (up->port.iotype) { @@ -317,6 +318,13 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset) return __raw_readl(up->port.membase + offset); #endif + case UPIO_TSI: + if (offset == UART_IIR) { + tmp = readl((u32 *)(up->port.membase + UART_RX)); + return (cpu_to_le32(tmp) >> 8) & 0xff; + } else + return readb(up->port.membase + offset); + default: return inb(up->port.iobase + offset); } @@ -346,6 +354,10 @@ serial_out(struct uart_8250_port *up, int offset, int value) __raw_writel(value, up->port.membase + offset); break; #endif + case UPIO_TSI: + if (!((offset == UART_IER) && (value & UART_IER_UUE))) + writeb(value, up->port.membase + offset); + break; default: outb(value, up->port.iobase + offset); |