serial_sh: Add support Renesas SH7752

[u-boot] / drivers / serial / serial.c

diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 44bb089dee9a55d4d27335b56d0e499341fb4924..1f8955a0fdb586c9cae12783d3e440641a8e8266 100644 (file)
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -22,6 +22,7 @@
  */
 
 #include <common.h>
+#include <environment.h>
 #include <serial.h>
 #include <stdio_dev.h>
 #include <post.h>
@@ -32,6 +33,11 @@ DECLARE_GLOBAL_DATA_PTR;
 
 static struct serial_device *serial_devices;
 static struct serial_device *serial_current;
+/*
+ * Table with supported baudrates (defined in config_xyz.h)
+ */
+static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
+#define        N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
 
 /**
  * serial_null() - Void registration routine of a serial driver
@@ -45,6 +51,70 @@ static void serial_null(void)
 {
 }
 
+/**
+ * on_baudrate() - Update the actual baudrate when the env var changes
+ *
+ * This will check for a valid baudrate and only apply it if valid.
+ */
+static int on_baudrate(const char *name, const char *value, enum env_op op,
+       int flags)
+{
+       int i;
+       int baudrate;
+
+       switch (op) {
+       case env_op_create:
+       case env_op_overwrite:
+               /*
+                * Switch to new baudrate if new baudrate is supported
+                */
+               baudrate = simple_strtoul(value, NULL, 10);
+
+               /* Not actually changing */
+               if (gd->baudrate == baudrate)
+                       return 0;
+
+               for (i = 0; i < N_BAUDRATES; ++i) {
+                       if (baudrate == baudrate_table[i])
+                               break;
+               }
+               if (i == N_BAUDRATES) {
+                       if ((flags & H_FORCE) == 0)
+                               printf("## Baudrate %d bps not supported\n",
+                                       baudrate);
+                       return 1;
+               }
+               if ((flags & H_INTERACTIVE) != 0) {
+                       printf("## Switch baudrate to %d"
+                               " bps and press ENTER ...\n", baudrate);
+                       udelay(50000);
+               }
+
+               gd->baudrate = baudrate;
+#if defined(CONFIG_PPC) || defined(CONFIG_MCF52x2)
+               gd->bd->bi_baudrate = baudrate;
+#endif
+
+               serial_setbrg();
+
+               udelay(50000);
+
+               if ((flags & H_INTERACTIVE) != 0)
+                       while (1) {
+                               if (getc() == '\r')
+                                       break;
+                       }
+
+               return 0;
+       case env_op_delete:
+               printf("## Baudrate may not be deleted\n");
+               return 1;
+       default:
+               return 0;
+       }
+}
+U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
+
 /**
  * serial_initfunc() - Forward declare of driver registration routine
  * @name:      Name of the real driver registration routine.
@@ -105,7 +175,6 @@ serial_initfunc(ks8695_serial_initialize);
 serial_initfunc(lh7a40x_serial_initialize);
 serial_initfunc(max3100_serial_initialize);
 serial_initfunc(mxc_serial_initialize);
-serial_initfunc(netarm_serial_initialize);
 serial_initfunc(pl01x_serial_initialize);
 serial_initfunc(s3c44b0_serial_initialize);
 serial_initfunc(sa1100_serial_initialize);
@@ -201,7 +270,6 @@ void serial_initialize(void)
        lh7a40x_serial_initialize();
        max3100_serial_initialize();
        mxc_serial_initialize();
-       netarm_serial_initialize();
        pl01x_serial_initialize();
        s3c44b0_serial_initialize();
        sa1100_serial_initialize();