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Diffstat (limited to 'packages/linux/linux-openzaurus-2.6.15/serial-add-support-for-non-standard-xtals-to-16c950-driver.patch')
-rw-r--r--packages/linux/linux-openzaurus-2.6.15/serial-add-support-for-non-standard-xtals-to-16c950-driver.patch155
1 files changed, 0 insertions, 155 deletions
diff --git a/packages/linux/linux-openzaurus-2.6.15/serial-add-support-for-non-standard-xtals-to-16c950-driver.patch b/packages/linux/linux-openzaurus-2.6.15/serial-add-support-for-non-standard-xtals-to-16c950-driver.patch
deleted file mode 100644
index 18bf4268fc..0000000000
--- a/packages/linux/linux-openzaurus-2.6.15/serial-add-support-for-non-standard-xtals-to-16c950-driver.patch
+++ /dev/null
@@ -1,155 +0,0 @@
-
-From: Petr Vandrovec <vandrove@vc.cvut.cz>
-
-Patch below adds support for using different prescaler than 16 for 16c950
-chips. This is needed for using Fujitsu-Siemens Connect2Air compact-flash
-card, which comes (apparently) with 806kHz clocks, and so you have to
-program prescaler for division by 7, and DLAB to 1, to get 115200Bd.
-
-To get card properly running you also have to add lines below to
-/etc/pcmcia/serial.opts so kernel knows that base speed is not 115200 but
-50400 (50400 * 16 = 806400; 806400 / 7 = 115200). As I've found no code
-specifying baud_rate in serial_cs, I assume that specifying it in
-serial.opts is right way to do this type of things.
-
-Patch also fixes problem that for UPF_MAGIC_MULTIPLIER maximum possible
-baud rate passed to uart code was uartclk / 16 while correct value for
-these devices (and for 16c950) is uartclk / 4.
-
-Patch also fixes problem that for UPF_MAGIC_MULTIPLIER devices with
-baud_rate 19200 or 9600 spd_cust did not work correctly. Not that such
-devices exist, but we should not ignore spd_cust, user probably knows why
-he asked for spd_cust.
-
-serial.opts:
-
-case "$MANFID-$FUNCID-$PRODID_1-$PRODID_2-$PRODID_3-$PRODID_4" in
-'0279,950b-2-GPRS Modem---')
- SERIAL_OPTS="baud_base 50400"
- ;;
-esac
-
-Cc: David Woodhouse <dwmw2@infradead.org>
-Signed-off-by: Andrew Morton <akpm@osdl.org>
----
-
- drivers/serial/8250.c | 82 +++++++++++++++++++++++++++++++++++++++-----------
- 1 files changed, 64 insertions(+), 18 deletions(-)
-
-diff -puN drivers/serial/8250.c~serial-add-support-for-non-standard-xtals-to-16c950-driver drivers/serial/8250.c
---- devel/drivers/serial/8250.c~serial-add-support-for-non-standard-xtals-to-16c950-driver 2005-09-12 03:34:57.000000000 -0700
-+++ devel-akpm/drivers/serial/8250.c 2005-09-12 03:34:57.000000000 -0700
-@@ -1653,24 +1653,58 @@ static void serial8250_shutdown(struct u
- serial_unlink_irq_chain(up);
- }
-
--static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud)
-+static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud,
-+ unsigned int *prescaler)
- {
-- unsigned int quot;
--
-- /*
-- * Handle magic divisors for baud rates above baud_base on
-- * SMSC SuperIO chips.
-+ /*
-+ * Use special handling only if user did not supply its own divider.
-+ * spd_cust is defined in terms of baud_base, so always use default
-+ * prescaler when spd_cust is requested.
- */
-- if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
-- baud == (port->uartclk/4))
-- quot = 0x8001;
-- else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
-- baud == (port->uartclk/8))
-- quot = 0x8002;
-- else
-- quot = uart_get_divisor(port, baud);
-
-- return quot;
-+ *prescaler = 16;
-+ if (baud != 38400 || (port->flags & UPF_SPD_MASK) != UPF_SPD_CUST) {
-+ unsigned int quot = port->uartclk / baud;
-+
-+ /*
-+ * Handle magic divisors for baud rates above baud_base on
-+ * SMSC SuperIO chips.
-+ */
-+ if (port->flags & UPF_MAGIC_MULTIPLIER) {
-+ if (quot == 4) {
-+ return 0x8001;
-+ } else if (quot == 8) {
-+ return 0x8002;
-+ }
-+ }
-+ if (port->type == PORT_16C950) {
-+ /*
-+ * This computes TCR value (4 to 16), not CPR value (which can
-+ * be between 1.000 and 31.875) - chip I have uses XTAL of
-+ * 806400Hz, and so a division by 7 is required to get 115200Bd.
-+ * I'm leaving CPR disabled for now, until someone will
-+ * hit even more exotic XTAL (it is needed to get 500kbps
-+ * or 1000kbps from 18.432MHz XTAL, but I have no device
-+ * which would benefit from doing that).
-+ *
-+ * If we can use divide by 16, use it. Otherwise look for
-+ * better prescaler, from 15 to 4. If quotient cannot
-+ * be divided by any integer value between 4 and 15, use 4.
-+ */
-+ if (quot & 0x0F) {
-+ unsigned int div;
-+
-+ for (div = 15; div > 4; div--) {
-+ if (quot % div == 0) {
-+ break;
-+ }
-+ }
-+ *prescaler = div;
-+ return quot / div;
-+ }
-+ }
-+ }
-+ return uart_get_divisor(port, baud);
- }
-
- static void
-@@ -1680,7 +1714,7 @@ serial8250_set_termios(struct uart_port
- struct uart_8250_port *up = (struct uart_8250_port *)port;
- unsigned char cval, fcr = 0;
- unsigned long flags;
-- unsigned int baud, quot;
-+ unsigned int baud, quot, prescaler;
-
- switch (termios->c_cflag & CSIZE) {
- case CS5:
-@@ -1712,8 +1746,13 @@ serial8250_set_termios(struct uart_port
- /*
- * Ask the core to calculate the divisor for us.
- */
-- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
-- quot = serial8250_get_divisor(port, baud);
-+
-+ if (port->type == PORT_16C950 || (port->flags & UPF_MAGIC_MULTIPLIER)) {
-+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
-+ } else {
-+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
-+ }
-+ quot = serial8250_get_divisor(port, baud, &prescaler);
-
- /*
- * Oxford Semi 952 rev B workaround
-@@ -1817,6 +1856,13 @@ serial8250_set_termios(struct uart_port
- serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */
-
- /*
-+ * Program prescaler for 16C950 chips.
-+ */
-+ if (up->port.type == PORT_16C950) {
-+ serial_icr_write(up, UART_TCR, prescaler == 16 ? 0 : prescaler);
-+ }
-+
-+ /*
- * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
- * is written without DLAB set, this mode will be disabled.
- */
-_