tty/powerpc: fix build break with ehv_bytechan.c on allyesconfig

The ePAPR hypervisor byte channel driver is supposed to work on all
ePAPR-compliant embedded PowerPC systems, but it had a reference to the MSR_GS
bit, which is available only on Book-E systems.

Also fix a couple integer-to-pointer typecast problems.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/tty/ehv_bytechan.c

@@ -226,10 +226,6 @@ void __init udbg_init_ehv_bc(void)
 	unsigned int rx_count, tx_count;
 	unsigned int ret;
 
-	/* Check if we're running as a guest of a hypervisor */
-	if (!(mfmsr() & MSR_GS))
-		return;
-
 	/* Verify the byte channel handle */
 	ret = ev_byte_channel_poll(CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE,
 				   &rx_count, &tx_count);
@@ -286,7 +282,7 @@ static int ehv_bc_console_byte_channel_send(unsigned int handle, const char *s,
 static void ehv_bc_console_write(struct console *co, const char *s,
 				 unsigned int count)
 {
-	unsigned int handle = (unsigned int)co->data;
+	unsigned int handle = (uintptr_t)co->data;
 	char s2[EV_BYTE_CHANNEL_MAX_BYTES];
 	unsigned int i, j = 0;
 	char c;
@@ -352,7 +348,7 @@ static int __init ehv_bc_console_init(void)
 			   CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE);
 #endif
 
-	ehv_bc_console.data = (void *)stdout_bc;
+	ehv_bc_console.data = (void *)(uintptr_t)stdout_bc;
 
 	/* add_preferred_console() must be called before register_console(),
 	   otherwise it won't work.  However, we don't want to enumerate all the