serial: earlycon: Add support for big-endian MMIO accesses

Support command line parameters of the form:
earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>

This commit seem to be needed even after commit:
serial: 8250: Add support for big-endian MMIO accesses
c627f2ceb692e8a9358b64ac2d139314e7bb0d17

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 16 insertions, 9 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 61ab1628a057..55bb093a08a3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -959,14 +959,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                 uart[8250],io,<addr>[,options]
                 uart[8250],mmio,<addr>[,options]
                 uart[8250],mmio32,<addr>[,options]
+                uart[8250],mmio32be,<addr>[,options]
                 uart[8250],0x<addr>[,options]
                         Start an early, polled-mode console on the 8250/16550
                         UART at the specified I/O port or MMIO address.
                         MMIO inter-register address stride is either 8-bit
-                        (mmio) or 32-bit (mmio32).
-                        If none of [io|mmio|mmio32], <addr> is assumed to be
-                        equivalent to 'mmio'. 'options' are specified in the
-                        same format described for "console=ttyS<n>"; if
+                        (mmio) or 32-bit (mmio32 or mmio32be).
+                        If none of [io|mmio|mmio32|mmio32be], <addr> is assumed
+                        to be equivalent to 'mmio'. 'options' are specified
+                        in the same format described for "console=ttyS<n>"; if
                         unspecified, the h/w is not initialized.
 
                 pl011,<addr>
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 6dc471e30e79..f09636083426 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -72,6 +72,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
 
         switch (port->iotype) {
         case UPIO_MEM32:
+        case UPIO_MEM32BE:
                 port->regshift = 2;     /* fall-through */
         case UPIO_MEM:
                 port->mapbase = addr;
@@ -90,9 +91,11 @@ static int __init parse_options(struct earlycon_device *device, char *options)
                 strlcpy(device->options, options, length);
         }
 
-        if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32)
+        if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32 ||
+            port->iotype == UPIO_MEM32BE)
                 pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
-                        (port->iotype == UPIO_MEM32) ? "32" : "",
+                        (port->iotype == UPIO_MEM) ? "" :
+                        (port->iotype == UPIO_MEM32) ? "32" : "32be",
                         (unsigned long long)port->mapbase,
                         device->options);
         else
@@ -133,7 +136,7 @@ static int __init register_earlycon(char *buf, const struct earlycon_id *match)
  *
  *      Registers the earlycon console matching the earlycon specified
  *      in the param string @buf. Acceptable param strings are of the form
- *         <name>,io|mmio|mmio32,<addr>,<options>
+ *         <name>,io|mmio|mmio32|mmio32be,<addr>,<options>
  *         <name>,0x<addr>,<options>
  *         <name>,<options>
  *         <name>
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index eec067d8eedb..860e59fd6ef4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1814,8 +1814,8 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *      @options: ptr for <options> field; NULL if not present (out)
  *
  *      Decodes earlycon kernel command line parameters of the form
- *         earlycon=<name>,io|mmio|mmio32,<addr>,<options>
- *         console=<name>,io|mmio|mmio32,<addr>,<options>
+ *         earlycon=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
+ *         console=<name>,io|mmio|mmio32|mmio32be,<addr>,<options>
  *
  *      The optional form
  *         earlycon=<name>,0x<addr>,<options>
@@ -1833,6 +1833,9 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
         } else if (strncmp(p, "mmio32,", 7) == 0) {
                 *iotype = UPIO_MEM32;
                 p += 7;
+        } else if (strncmp(p, "mmio32be,", 9) == 0) {
+                *iotype = UPIO_MEM32BE;
+                p += 9;
         } else if (strncmp(p, "io,", 3) == 0) {
                 *iotype = UPIO_PORT;
                 p += 3;