diff options
| author |   Magnus Damm <magnus.damm@gmail.com> | 2008-04-23 21:05:11 +0900 |
|---|---|---|
| committer |   Paul Mundt <lethal@linux-sh.org> | 2008-05-08 19:51:53 +0900 |
| commit | 4a65e3827bcff072e5f4a96b3f73f9f17eb7d6d8 (patch) | |
| tree | bdfc0eb486e76e31024cf7279c7f55c32516e827 | |
| parent | sh: use sci_out() for early printk (diff) | |
| download | linux-dev-4a65e3827bcff072e5f4a96b3f73f9f17eb7d6d8.tar.xz linux-dev-4a65e3827bcff072e5f4a96b3f73f9f17eb7d6d8.zip | |
sh: drain and wait for early printk
Drain by waiting for all characters to be sent, and make sure to
wait a little bit after setting up the baud rate.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | arch/sh/kernel/early_printk.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/sh/kernel/early_printk.c b/arch/sh/kernel/early_printk.c index 18ca249e8409..11b4c85999b7 100644 --- a/arch/sh/kernel/early_printk.c +++ b/arch/sh/kernel/early_printk.c @@ -143,6 +143,7 @@ static void scif_sercon_init(char *s) { struct uart_port *port = &scif_port; unsigned baud = DEFAULT_BAUD; + unsigned int status; char *e; if (*s == ',') @@ -161,12 +162,17 @@ static void scif_sercon_init(char *s) baud = DEFAULT_BAUD; } + do { + status = sci_in(port, SCxSR); + } while (!(status & SCxSR_TEND(port))); + sci_out(port, SCSCR, 0); /* TE=0, RE=0 */ sci_out(port, SCSMR, 0); /* Set baud rate */ sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) / (32 * baud) - 1); + udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */ sci_out(port, SCFCR, 12); sci_out(port, SCFCR, 8); |