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authorZang Roy-r61911 <tie-fei.zang@freescale.com>2006-06-30 05:29:58 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-07-09 16:11:09 -0400
commit3be91ec7388bae3cf1bfb4febcee5ab6c65f409f (patch)
treecb2fa80f81321e0d1dda6e88ca95ade081064624 /drivers/serial/8250.c
parentc65b15cfd6b8b74c6f2b3635bf47ee661d351ef3 (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.c12
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)
299 299
300static unsigned int serial_in(struct uart_8250_port *up, int offset) 300static unsigned int serial_in(struct uart_8250_port *up, int offset)
301{ 301{
302 unsigned int tmp;
302 offset = map_8250_in_reg(up, offset) << up->port.regshift; 303 offset = map_8250_in_reg(up, offset) << up->port.regshift;
303 304
304 switch (up->port.iotype) { 305 switch (up->port.iotype) {
@@ -317,6 +318,13 @@ static unsigned int serial_in(struct uart_8250_port *up, int offset)
317 return __raw_readl(up->port.membase + offset); 318 return __raw_readl(up->port.membase + offset);
318#endif 319#endif
319 320
321 case UPIO_TSI:
322 if (offset == UART_IIR) {
323 tmp = readl((u32 *)(up->port.membase + UART_RX));
324 return (cpu_to_le32(tmp) >> 8) & 0xff;
325 } else
326 return readb(up->port.membase + offset);
327
320 default: 328 default:
321 return inb(up->port.iobase + offset); 329 return inb(up->port.iobase + offset);
322 } 330 }
@@ -346,6 +354,10 @@ serial_out(struct uart_8250_port *up, int offset, int value)
346 __raw_writel(value, up->port.membase + offset); 354 __raw_writel(value, up->port.membase + offset);
347 break; 355 break;
348#endif 356#endif
357 case UPIO_TSI:
358 if (!((offset == UART_IER) && (value & UART_IER_UUE)))
359 writeb(value, up->port.membase + offset);
360 break;
349 361
350 default: 362 default:
351 outb(value, up->port.iobase + offset); 363 outb(value, up->port.iobase + offset);