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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-11-19 06:10:35 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-19 06:10:35 -0500
commitb63d4f0fb80918ab37b6c0ee1adcd49e05c9994c (patch)
tree33af84cc60a0ad29c01632f24cba42eeb498be1a /drivers/serial
parent811803c5572b296e0031e0099203de90d77c7bcf (diff)
[SERIAL] Fix status reporting with PL011 serial driver
The receiver status register reports latched error conditions, which must be cleared by writing to it. However, the data register reports unlatched conditions which are associated with the current character. Use the data register to interpret error status rather than the RSR. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/amba-pl011.c45
1 files changed, 22 insertions, 23 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 938d185841c9..89d7bd3eaee3 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -49,7 +49,6 @@
49#include <linux/serial.h> 49#include <linux/serial.h>
50 50
51#include <asm/io.h> 51#include <asm/io.h>
52#include <asm/irq.h>
53#include <asm/sizes.h> 52#include <asm/sizes.h>
54#include <asm/hardware/amba.h> 53#include <asm/hardware/amba.h>
55#include <asm/hardware/clock.h> 54#include <asm/hardware/clock.h>
@@ -63,7 +62,8 @@
63 62
64#define AMBA_ISR_PASS_LIMIT 256 63#define AMBA_ISR_PASS_LIMIT 256
65 64
66#define UART_DUMMY_RSR_RX 256 65#define UART_DR_ERROR (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
66#define UART_DUMMY_DR_RX (1 << 16)
67 67
68/* 68/*
69 * We wrap our port structure around the generic uart_port. 69 * We wrap our port structure around the generic uart_port.
@@ -116,7 +116,7 @@ pl011_rx_chars(struct uart_amba_port *uap)
116#endif 116#endif
117{ 117{
118 struct tty_struct *tty = uap->port.info->tty; 118 struct tty_struct *tty = uap->port.info->tty;
119 unsigned int status, ch, flag, rsr, max_count = 256; 119 unsigned int status, ch, flag, max_count = 256;
120 120
121 status = readw(uap->port.membase + UART01x_FR); 121 status = readw(uap->port.membase + UART01x_FR);
122 while ((status & UART01x_FR_RXFE) == 0 && max_count--) { 122 while ((status & UART01x_FR_RXFE) == 0 && max_count--) {
@@ -129,7 +129,7 @@ pl011_rx_chars(struct uart_amba_port *uap)
129 */ 129 */
130 } 130 }
131 131
132 ch = readw(uap->port.membase + UART01x_DR); 132 ch = readw(uap->port.membase + UART01x_DR) | UART_DUMMY_DR_RX;
133 flag = TTY_NORMAL; 133 flag = TTY_NORMAL;
134 uap->port.icount.rx++; 134 uap->port.icount.rx++;
135 135
@@ -137,34 +137,33 @@ pl011_rx_chars(struct uart_amba_port *uap)
137 * Note that the error handling code is 137 * Note that the error handling code is
138 * out of the main execution path 138 * out of the main execution path
139 */ 139 */
140 rsr = readw(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX; 140 if (unlikely(ch & UART_DR_ERROR)) {
141 if (unlikely(rsr & UART01x_RSR_ANY)) { 141 if (ch & UART011_DR_BE) {
142 if (rsr & UART01x_RSR_BE) { 142 ch &= ~(UART011_DR_FE | UART011_DR_PE);
143 rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
144 uap->port.icount.brk++; 143 uap->port.icount.brk++;
145 if (uart_handle_break(&uap->port)) 144 if (uart_handle_break(&uap->port))
146 goto ignore_char; 145 goto ignore_char;
147 } else if (rsr & UART01x_RSR_PE) 146 } else if (ch & UART011_DR_PE)
148 uap->port.icount.parity++; 147 uap->port.icount.parity++;
149 else if (rsr & UART01x_RSR_FE) 148 else if (ch & UART011_DR_FE)
150 uap->port.icount.frame++; 149 uap->port.icount.frame++;
151 if (rsr & UART01x_RSR_OE) 150 if (ch & UART011_DR_OE)
152 uap->port.icount.overrun++; 151 uap->port.icount.overrun++;
153 152
154 rsr &= uap->port.read_status_mask; 153 ch &= uap->port.read_status_mask;
155 154
156 if (rsr & UART01x_RSR_BE) 155 if (ch & UART011_DR_BE)
157 flag = TTY_BREAK; 156 flag = TTY_BREAK;
158 else if (rsr & UART01x_RSR_PE) 157 else if (ch & UART011_DR_PE)
159 flag = TTY_PARITY; 158 flag = TTY_PARITY;
160 else if (rsr & UART01x_RSR_FE) 159 else if (ch & UART011_DR_FE)
161 flag = TTY_FRAME; 160 flag = TTY_FRAME;
162 } 161 }
163 162
164 if (uart_handle_sysrq_char(&uap->port, ch, regs)) 163 if (uart_handle_sysrq_char(&uap->port, ch, regs))
165 goto ignore_char; 164 goto ignore_char;
166 165
167 uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag); 166 uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);
168 167
169 ignore_char: 168 ignore_char:
170 status = readw(uap->port.membase + UART01x_FR); 169 status = readw(uap->port.membase + UART01x_FR);
@@ -476,33 +475,33 @@ pl011_set_termios(struct uart_port *port, struct termios *termios,
476 */ 475 */
477 uart_update_timeout(port, termios->c_cflag, baud); 476 uart_update_timeout(port, termios->c_cflag, baud);
478 477
479 port->read_status_mask = UART01x_RSR_OE; 478 port->read_status_mask = UART011_DR_OE | 255;
480 if (termios->c_iflag & INPCK) 479 if (termios->c_iflag & INPCK)
481 port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; 480 port->read_status_mask |= UART011_DR_FE | UART011_DR_PE;
482 if (termios->c_iflag & (BRKINT | PARMRK)) 481 if (termios->c_iflag & (BRKINT | PARMRK))
483 port->read_status_mask |= UART01x_RSR_BE; 482 port->read_status_mask |= UART011_DR_BE;
484 483
485 /* 484 /*
486 * Characters to ignore 485 * Characters to ignore
487 */ 486 */
488 port->ignore_status_mask = 0; 487 port->ignore_status_mask = 0;
489 if (termios->c_iflag & IGNPAR) 488 if (termios->c_iflag & IGNPAR)
490 port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE; 489 port->ignore_status_mask |= UART011_DR_FE | UART011_DR_PE;
491 if (termios->c_iflag & IGNBRK) { 490 if (termios->c_iflag & IGNBRK) {
492 port->ignore_status_mask |= UART01x_RSR_BE; 491 port->ignore_status_mask |= UART011_DR_BE;
493 /* 492 /*
494 * If we're ignoring parity and break indicators, 493 * If we're ignoring parity and break indicators,
495 * ignore overruns too (for real raw support). 494 * ignore overruns too (for real raw support).
496 */ 495 */
497 if (termios->c_iflag & IGNPAR) 496 if (termios->c_iflag & IGNPAR)
498 port->ignore_status_mask |= UART01x_RSR_OE; 497 port->ignore_status_mask |= UART011_DR_OE;
499 } 498 }
500 499
501 /* 500 /*
502 * Ignore all characters if CREAD is not set. 501 * Ignore all characters if CREAD is not set.
503 */ 502 */
504 if ((termios->c_cflag & CREAD) == 0) 503 if ((termios->c_cflag & CREAD) == 0)
505 port->ignore_status_mask |= UART_DUMMY_RSR_RX; 504 port->ignore_status_mask |= UART_DUMMY_DR_RX;
506 505
507 if (UART_ENABLE_MS(port, termios->c_cflag)) 506 if (UART_ENABLE_MS(port, termios->c_cflag))
508 pl011_enable_ms(port); 507 pl011_enable_ms(port);