[PATCH] pcmcia: Add support for Possio GCC AKA PCMCIA Siemens MC45

This ugly hack add support for Siemens MC45 PCMCIA GPRS card (which is
identical to Possio GCC, and which is offered by one of our local GPRS
providers).  Card has unfortunate feature that after poweron oxcf950 chip
is fully powered and works, but attached MC45 modem is powered down :-(
There is a special sequence (which takes 1 sec :-( ) to poweron MC45 (and
after MC45 powers on, it takes more than 2 secs until firmware fully
boots...) which needs to be executed after all powerons.

I'm really not familiar with PCMCIA subsystem, so I have no idea whether I
should issue request_region() on rest of oxcf950 address range (0-7 is
UART, 8-F are special configuration registers), or how this should be
better integrated with PM system and so on - I just put it in same place
where another hack already lived...

Card uses 18.432MHz XTAL, so to get it to work you must add lines below to
the /etc/pcmcia/serial.opts.

case "$MANFID-$FUNCID-$PRODID_1-$PRODID_2-$PRODID_3-$PRODID_4" in
'030c,0003-2-GPRS-CARD--')
    SERIAL_OPTS="baud_base 1152000"
    ;;
esac

Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

2 files changed, 49 insertions, 6 deletions

diff --git a/drivers/serial/serial_cs.c b/drivers/serial/serial_cs.c
index 389d847cd1b4..2c70773543e0 100644
--- a/drivers/serial/serial_cs.c
+++ b/drivers/serial/serial_cs.c
@@ -41,6 +41,7 @@
 #include <linux/string.h>
 #include <linux/timer.h>
 #include <linux/serial_core.h>
+#include <linux/delay.h>
 #include <linux/major.h>
 #include <asm/io.h>
 #include <asm/system.h>
@@ -102,6 +103,8 @@ struct serial_info {
         int                     multi;
         int                     slave;
         int                     manfid;
+        int                     prodid;
+        int                     c950ctrl;
         dev_node_t              node[4];
         int                     line[4];
 };
@@ -116,6 +119,33 @@ struct serial_cfg_mem {
 static int serial_config(struct pcmcia_device * link);
 
 
+static void wakeup_card(struct serial_info *info)
+{
+        int ctrl = info->c950ctrl;
+
+        if (info->manfid == MANFID_OXSEMI) {
+                outb(12, ctrl + 1);
+        } else if (info->manfid == MANFID_POSSIO && info->prodid == PRODID_POSSIO_GCC) {
+                /* request_region? oxsemi branch does no request_region too... */
+                /* This sequence is needed to properly initialize MC45 attached to OXCF950.
+                 * I tried decreasing these msleep()s, but it worked properly (survived
+                 * 1000 stop/start operations) with these timeouts (or bigger). */
+                outb(0xA, ctrl + 1);
+                msleep(100);
+                outb(0xE, ctrl + 1);
+                msleep(300);
+                outb(0xC, ctrl + 1);
+                msleep(100);
+                outb(0xE, ctrl + 1);
+                msleep(200);
+                outb(0xF, ctrl + 1);
+                msleep(100);
+                outb(0xE, ctrl + 1);
+                msleep(100);
+                outb(0xC, ctrl + 1);
+        }
+}
+
 /*======================================================================
 
     After a card is removed, serial_remove() will unregister
@@ -161,6 +191,7 @@ static int serial_resume(struct pcmcia_device *link)
 
                 for (i = 0; i < info->ndev; i++)
                         serial8250_resume_port(info->line[i]);
+                wakeup_card(info);
         }
 
         return 0;
@@ -503,15 +534,23 @@ static int multi_config(struct pcmcia_device * link)
         }
 
         /* The Oxford Semiconductor OXCF950 cards are in fact single-port:
-           8 registers are for the UART, the others are extra registers */
-        if (info->manfid == MANFID_OXSEMI) {
+         * 8 registers are for the UART, the others are extra registers.
+         * Siemen's MC45 PCMCIA (Possio's GCC) is OXCF950 based too.
+         */
+        if (info->manfid == MANFID_OXSEMI || (info->manfid == MANFID_POSSIO &&
+                                info->prodid == PRODID_POSSIO_GCC)) {
+                int err;
+
                 if (cf->index == 1 || cf->index == 3) {
-                        setup_serial(link, info, base2, link->irq.AssignedIRQ);
-                        outb(12, link->io.BasePort1 + 1);
+                        err = setup_serial(link, info, base2,
+                                        link->irq.AssignedIRQ);
+                        base2 = link->io.BasePort1;
                 } else {
-                        setup_serial(link, info, link->io.BasePort1, link->irq.AssignedIRQ);
-                        outb(12, base2 + 1);
+                        err = setup_serial(link, info, link->io.BasePort1,
+                                        link->irq.AssignedIRQ);
                 }
+                info->c950ctrl = base2;
+                wakeup_card(info);
                 rc = 0;
                 goto free_cfg_mem;
         }
@@ -583,6 +622,7 @@ static int serial_config(struct pcmcia_device * link)
         tuple->DesiredTuple = CISTPL_MANFID;
         if (first_tuple(link, tuple, parse) == CS_SUCCESS) {
                 info->manfid = parse->manfid.manf;
+                info->prodid = le16_to_cpu(buf[1]);
                 for (i = 0; i < MULTI_COUNT; i++)
                         if ((info->manfid == multi_id[i].manfid) &&
                             (parse->manfid.card == multi_id[i].prodid))
diff --git a/include/pcmcia/ciscode.h b/include/pcmcia/ciscode.h
index 951cdb5d5499..c1da8558339a 100644
--- a/include/pcmcia/ciscode.h
+++ b/include/pcmcia/ciscode.h
@@ -122,4 +122,7 @@
 
 #define MANFID_XIRCOM                   0x0105
 
+#define MANFID_POSSIO                   0x030c
+#define PRODID_POSSIO_GCC               0x0003
+
 #endif /* _LINUX_CISCODE_H */