File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/powerpc/boot/mpc52xx-psc.c b/arch/powerpc/boot/mpc52xx-psc.c
new file mode 100644
index 0000000..d4cb4e4
--- /dev/null
+++ b/arch/powerpc/boot/mpc52xx-psc.c
@@ -0,0 +1,64 @@
+/*
+ * MPC5200 PSC serial console support.
+ *
+ * Author: Grant Likely <grant.likely@secretlab.ca>
+ *
+ * Copyright (c) 2007 Secret Lab Technologies Ltd.
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * It is assumed that the firmware (or the platform file) has already set
+ * up the port.
+ */
+
+#include "types.h"
+#include "io.h"
+#include "ops.h"
+
+/* Programmable Serial Controller (PSC) status register bits */
+#define MPC52xx_PSC_SR 0x04
+#define MPC52xx_PSC_SR_RXRDY 0x0100
+#define MPC52xx_PSC_SR_RXFULL 0x0200
+#define MPC52xx_PSC_SR_TXRDY 0x0400
+#define MPC52xx_PSC_SR_TXEMP 0x0800
+
+#define MPC52xx_PSC_BUFFER 0x0C
+
+static void *psc;
+
+static int psc_open(void)
+{
+ /* Assume the firmware has already configured the PSC into
+ * uart mode */
+ return 0;
+}
+
+static void psc_putc(unsigned char c)
+{
+ while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_TXRDY)) ;
+ out_8(psc + MPC52xx_PSC_BUFFER, c);
+}
+
+static unsigned char psc_tstc(void)
+{
+ return (in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY) != 0;
+}
+
+static unsigned char psc_getc(void)
+{
+ while (!(in_be16(psc + MPC52xx_PSC_SR) & MPC52xx_PSC_SR_RXRDY)) ;
+ return in_8(psc + MPC52xx_PSC_BUFFER);
+}
+
+int mpc5200_psc_console_init(void *devp, struct serial_console_data *scdp)
+{
+ /* Get the base address of the psc registers */
+ if (dt_get_virtual_reg(devp, &psc, 1) < 1)
+ return -1;
+
+ scdp->open = psc_open;
+ scdp->putc = psc_putc;
+ scdp->getc = psc_getc;
+ scdp->tstc = psc_tstc;
+
+ return 0;
+}