4 files changed, 257 insertions, 1 deletions

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 54a72108bcc3..075f961db12f 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -44,7 +44,8 @@ $(addprefix $(obj)/,$(zlib) gunzip_util.o main.o): \
 src-wlib := string.S crt0.S stdio.c main.c flatdevtree.c flatdevtree_misc.c \
                 ns16550.c serial.c simple_alloc.c div64.S util.S \
                 gunzip_util.c elf_util.c $(zlib) devtree.c oflib.c ofconsole.c \
-                4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c
+                4xx.c ebony.c mv64x60.c mpsc.c mv64x60_i2c.c cuboot.c bamboo.c \
+                cpm-serial.c
 src-plat := of.c cuboot-83xx.c cuboot-85xx.c holly.c \
                 cuboot-ebony.c treeboot-ebony.c prpmc2800.c \
                 ps3-head.S ps3-hvcall.S ps3.c treeboot-bamboo.c
diff --git a/arch/powerpc/boot/cpm-serial.c b/arch/powerpc/boot/cpm-serial.c
new file mode 100644
index 000000000000..fcb8b5e956bd
--- /dev/null
+++ b/arch/powerpc/boot/cpm-serial.c
@@ -0,0 +1,249 @@
+/*
+ * CPM serial console support.
+ *
+ * Copyright 2007 Freescale Semiconductor, Inc.
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * 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"
+
+struct cpm_scc {
+        u32 gsmrl;
+        u32 gsmrh;
+        u16 psmr;
+        u8 res1[2];
+        u16 todr;
+        u16 dsr;
+        u16 scce;
+        u8 res2[2];
+        u16 sccm;
+        u8 res3;
+        u8 sccs;
+        u8 res4[8];
+};
+
+struct cpm_smc {
+        u8 res1[2];
+        u16 smcmr;
+        u8 res2[2];
+        u8 smce;
+        u8 res3[3];
+        u8 smcm;
+        u8 res4[5];
+};
+
+struct cpm_param {
+        u16 rbase;
+        u16 tbase;
+        u8 rfcr;
+        u8 tfcr;
+};
+
+struct cpm_bd {
+        u16 sc;   /* Status and Control */
+        u16 len;  /* Data length in buffer */
+        u8 *addr; /* Buffer address in host memory */
+};
+
+static void *cpcr;
+static struct cpm_param *param;
+static struct cpm_smc *smc;
+static struct cpm_scc *scc;
+struct cpm_bd *tbdf, *rbdf;
+static u32 cpm_cmd;
+static u8 *dpram_start;
+
+static void (*do_cmd)(int op);
+static void (*enable_port)(void);
+static void (*disable_port)(void);
+
+#define CPM_CMD_STOP_TX     4
+#define CPM_CMD_RESTART_TX  6
+#define CPM_CMD_INIT_RX_TX  0
+
+static void cpm1_cmd(int op)
+{
+        while (in_be16(cpcr) & 1)
+                ;
+
+        out_be16(cpcr, (op << 8) | cpm_cmd | 1);
+
+        while (in_be16(cpcr) & 1)
+                ;
+}
+
+static void cpm2_cmd(int op)
+{
+        while (in_be32(cpcr) & 0x10000)
+                ;
+
+        out_be32(cpcr, op | cpm_cmd | 0x10000);
+
+        while (in_be32(cpcr) & 0x10000)
+                ;
+}
+
+static void smc_disable_port(void)
+{
+        do_cmd(CPM_CMD_STOP_TX);
+        out_be16(&smc->smcmr, in_be16(&smc->smcmr) & ~3);
+}
+
+static void scc_disable_port(void)
+{
+        do_cmd(CPM_CMD_STOP_TX);
+        out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) & ~0x30);
+}
+
+static void smc_enable_port(void)
+{
+        out_be16(&smc->smcmr, in_be16(&smc->smcmr) | 3);
+        do_cmd(CPM_CMD_RESTART_TX);
+}
+
+static void scc_enable_port(void)
+{
+        out_be32(&scc->gsmrl, in_be32(&scc->gsmrl) | 0x30);
+        do_cmd(CPM_CMD_RESTART_TX);
+}
+
+static int cpm_serial_open(void)
+{
+        int dpaddr = 0x800;
+        disable_port();
+
+        out_8(&param->rfcr, 0x10);
+        out_8(&param->tfcr, 0x10);
+
+        rbdf = (struct cpm_bd *)(dpram_start + dpaddr);
+        rbdf->addr = (u8 *)(rbdf + 2);
+        rbdf->sc = 0xa000;
+        rbdf->len = 1;
+
+        tbdf = rbdf + 1;
+        tbdf->addr = (u8 *)(rbdf + 2) + 1;
+        tbdf->sc = 0x2000;
+        tbdf->len = 1;
+
+        sync();
+        out_be16(&param->rbase, dpaddr);
+        out_be16(&param->tbase, dpaddr + sizeof(struct cpm_bd));
+
+        do_cmd(CPM_CMD_INIT_RX_TX);
+
+        enable_port();
+        return 0;
+}
+
+static void cpm_serial_putc(unsigned char c)
+{
+        while (tbdf->sc & 0x8000)
+                barrier();
+
+        sync();
+
+        tbdf->addr[0] = c;
+        eieio();
+        tbdf->sc |= 0x8000;
+}
+
+static unsigned char cpm_serial_tstc(void)
+{
+        barrier();
+        return !(rbdf->sc & 0x8000);
+}
+
+static unsigned char cpm_serial_getc(void)
+{
+        unsigned char c;
+
+        while (!cpm_serial_tstc())
+                ;
+
+        sync();
+        c = rbdf->addr[0];
+        eieio();
+        rbdf->sc |= 0x8000;
+
+        return c;
+}
+
+int cpm_console_init(void *devp, struct serial_console_data *scdp)
+{
+        void *reg_virt[2];
+        int is_smc = 0, is_cpm2 = 0, n;
+        unsigned long reg_phys;
+        void *parent;
+
+        if (dt_is_compatible(devp, "fsl,cpm1-smc-uart")) {
+                is_smc = 1;
+        } else if (dt_is_compatible(devp, "fsl,cpm2-scc-uart")) {
+                is_cpm2 = 1;
+        } else if (dt_is_compatible(devp, "fsl,cpm2-smc-uart")) {
+                is_cpm2 = 1;
+                is_smc = 1;
+        }
+
+        if (is_smc) {
+                enable_port = smc_enable_port;
+                disable_port = smc_disable_port;
+        } else {
+                enable_port = scc_enable_port;
+                disable_port = scc_disable_port;
+        }
+
+        if (is_cpm2)
+                do_cmd = cpm2_cmd;
+        else
+                do_cmd = cpm1_cmd;
+
+        n = getprop(devp, "fsl,cpm-command", &cpm_cmd, 4);
+        if (n < 4)
+                return -1;
+
+        n = getprop(devp, "virtual-reg", reg_virt, sizeof(reg_virt));
+        if (n < (int)sizeof(reg_virt)) {
+                for (n = 0; n < 2; n++) {
+                        if (!dt_xlate_reg(devp, n, &reg_phys, NULL))
+                                return -1;
+
+                        reg_virt[n] = (void *)reg_phys;
+                }
+        }
+
+        if (is_smc)
+                smc = reg_virt[0];
+        else
+                scc = reg_virt[0];
+
+        param = reg_virt[1];
+
+        parent = get_parent(devp);
+        if (!parent)
+                return -1;
+
+        n = getprop(parent, "virtual-reg", reg_virt, sizeof(reg_virt));
+        if (n < (int)sizeof(reg_virt)) {
+                for (n = 0; n < 2; n++) {
+                        if (!dt_xlate_reg(parent, n, &reg_phys, NULL))
+                                return -1;
+
+                        reg_virt[n] = (void *)reg_phys;
+                }
+        }
+
+        cpcr = reg_virt[0];
+        dpram_start = reg_virt[1];
+
+        scdp->open = cpm_serial_open;
+        scdp->putc = cpm_serial_putc;
+        scdp->getc = cpm_serial_getc;
+        scdp->tstc = cpm_serial_tstc;
+
+        return 0;
+}
diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index e45b364e7fcf..2bc2f02db741 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -82,6 +82,7 @@ int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device);
 int serial_console_init(void);
 int ns16550_console_init(void *devp, struct serial_console_data *scdp);
 int mpsc_console_init(void *devp, struct serial_console_data *scdp);
+int cpm_console_init(void *devp, struct serial_console_data *scdp);
 void *simple_alloc_init(char *base, unsigned long heap_size,
                         unsigned long granularity, unsigned long max_allocs);
 extern void flush_cache(void *, unsigned long);
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index 944f0ee5bc0f..d47f8e0b4b81 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -121,6 +121,11 @@ int serial_console_init(void)
                 rc = ns16550_console_init(devp, &serial_cd);
         else if (dt_is_compatible(devp, "marvell,mpsc"))
                 rc = mpsc_console_init(devp, &serial_cd);
+        else if (dt_is_compatible(devp, "fsl,cpm1-scc-uart") ||
+                 dt_is_compatible(devp, "fsl,cpm1-smc-uart") ||
+                 dt_is_compatible(devp, "fsl,cpm2-scc-uart") ||
+                 dt_is_compatible(devp, "fsl,cpm2-smc-uart"))
+                rc = cpm_console_init(devp, &serial_cd);
 
         /* Add other serial console driver calls here */