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Date: Tue, 15 Jul 2008 07:27:55 -0500
From: Jason Wessel <jason.wessel@...driver.com>
To: linux-kernel@...r.kernel.org
Cc: Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 3/4] kgdb: kgdboc console poll hooks for cpm uart
Add in console polling hooks for the cpm uart for use with kgdb and
kgdboc.
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
---
drivers/serial/cpm_uart/cpm_uart_core.c | 95 ++++++++++++++++++++++++++++++-
1 files changed, 94 insertions(+), 1 deletions(-)
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c
index a19dc7e..1cb07a5 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -257,6 +257,10 @@ static void cpm_uart_int_tx(struct uart_port *port)
cpm_uart_tx_pump(port);
}
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
/*
* Receive characters
*/
@@ -278,6 +282,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
*/
bdp = pinfo->rx_cur;
for (;;) {
+#ifdef CONFIG_CONSOLE_POLL
+ if (unlikely(serial_polled)) {
+ serial_polled = 0;
+ return;
+ }
+#endif
/* get status */
status = in_be16(&bdp->cbd_sc);
/* If this one is empty, return happy */
@@ -309,7 +319,12 @@ static void cpm_uart_int_rx(struct uart_port *port)
goto handle_error;
if (uart_handle_sysrq_char(port, ch))
continue;
-
+#ifdef CONFIG_CONSOLE_POLL
+ if (unlikely(serial_polled)) {
+ serial_polled = 0;
+ return;
+ }
+#endif
error_return:
tty_insert_flip_char(tty, ch, flg);
@@ -916,6 +931,80 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
cpm_uart_request_port(port);
}
}
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+#define GDB_BUF_SIZE 512 /* power of 2, please */
+
+static char poll_buf[GDB_BUF_SIZE];
+static char *pollp;
+static int poll_chars;
+
+static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
+{
+ u_char c, *cp;
+ volatile cbd_t *bdp;
+ int i;
+
+ /* Get the address of the host memory buffer.
+ */
+ bdp = pinfo->rx_cur;
+ while (bdp->cbd_sc & BD_SC_EMPTY)
+ ;
+
+ /* If the buffer address is in the CPM DPRAM, don't
+ * convert it.
+ */
+ cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
+
+ if (obuf) {
+ i = c = bdp->cbd_datlen;
+ while (i-- > 0)
+ *obuf++ = *cp++;
+ } else
+ c = *cp;
+ bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
+ bdp->cbd_sc |= BD_SC_EMPTY;
+
+ if (bdp->cbd_sc & BD_SC_WRAP)
+ bdp = pinfo->rx_bd_base;
+ else
+ bdp++;
+ pinfo->rx_cur = (cbd_t *)bdp;
+
+ return (int)c;
+}
+
+static int cpm_get_poll_char(struct uart_port *port)
+{
+ struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+ if (!serial_polled) {
+ serial_polled = 1;
+ poll_chars = 0;
+ }
+ if (poll_chars <= 0) {
+ poll_chars = poll_wait_key(poll_buf, pinfo);
+ pollp = poll_buf;
+ }
+ poll_chars--;
+ return *pollp++;
+}
+
+static void cpm_put_poll_char(struct uart_port *port,
+ unsigned char c)
+{
+ struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+ static char ch[2];
+
+ ch[0] = (char)c;
+ cpm_uart_early_write(pinfo->port.line, ch, 1);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
static struct uart_ops cpm_uart_pops = {
.tx_empty = cpm_uart_tx_empty,
.set_mctrl = cpm_uart_set_mctrl,
@@ -933,6 +1022,10 @@ static struct uart_ops cpm_uart_pops = {
.request_port = cpm_uart_request_port,
.config_port = cpm_uart_config_port,
.verify_port = cpm_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = cpm_get_poll_char,
+ .poll_put_char = cpm_put_poll_char,
+#endif
};
#ifdef CONFIG_PPC_CPM_NEW_BINDING
--
1.5.5.1
--
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