[POWERPC] PPC 4xx: Enable XMON on PPC 4xx boards

The following patch allows XMON to run on the 4xx platform.  Tested on
Walnut, Ebony, and Nova (440GX based) eval boards.  440EP, 440SP, and
440SPE boards should work as well.  Patch is against 2.6.18-rc6.

Signed-off-by: Josh Boyer <jdub@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/ppc/xmon/start.c b/arch/ppc/xmon/start.c
index f7e92986952a2e669ae2fff8e5f45d1caf325041..d74a883e5bdeab5b82e1069e6cae3fe038c1472d 100644 (file)
--- a/arch/ppc/xmon/start.c
+++ b/arch/ppc/xmon/start.c
@@ -15,6 +15,7 @@
 #include <asm/processor.h>
 #include <asm/delay.h>
 #include <asm/btext.h>
+#include <asm/ibm4xx.h>
 
 static volatile unsigned char *sccc, *sccd;
 unsigned int TXRDY, RXRDY, DLAB;
@@ -57,23 +58,30 @@ static struct sysrq_key_op sysrq_xmon_op =
 void
 xmon_map_scc(void)
 {
-#ifdef CONFIG_PPC_PREP
-       volatile unsigned char *base;
-
-#elif defined(CONFIG_GEMINI)
+#if defined(CONFIG_GEMINI)
        /* should already be mapped by the kernel boot */
-       sccc = (volatile unsigned char *) 0xffeffb0d;
        sccd = (volatile unsigned char *) 0xffeffb08;
-       TXRDY = 0x20;
-       RXRDY = 1;
-       DLAB = 0x80;
 #elif defined(CONFIG_405GP)
-       sccc = (volatile unsigned char *)0xef600305;
        sccd = (volatile unsigned char *)0xef600300;
+#elif defined(CONFIG_440EP)
+       sccd = (volatile unsigned char *) ioremap(PPC440EP_UART0_ADDR, 8);
+#elif defined(CONFIG_440SP)
+       sccd = (volatile unsigned char *) ioremap64(PPC440SP_UART0_ADDR, 8);
+#elif defined(CONFIG_440SPE)
+       sccd = (volatile unsigned char *) ioremap64(PPC440SPE_UART0_ADDR, 8);
+#elif defined(CONFIG_44x)
+       /* This is the default for 44x platforms.  Any boards that have a
+          different UART address need to be put in cases before this or the
+          port will be mapped incorrectly */
+       sccd = (volatile unsigned char *) ioremap64(PPC440GP_UART0_ADDR, 8);
+#endif /* platform */
+
+#ifndef CONFIG_PPC_PREP
+       sccc = sccd + 5;
        TXRDY = 0x20;
        RXRDY = 1;
        DLAB = 0x80;
-#endif /* platform */
+#endif
 
        register_sysrq_key('x', &sysrq_xmon_op);
 }

diff --git a/arch/ppc/xmon/xmon.c b/arch/ppc/xmon/xmon.c
index 37d234f93394a3a16bfed9ebeb03d6523b5868a9..25d032b2aec7ee77cb70d94829ccf9e8f2aeeab9 100644 (file)
--- a/arch/ppc/xmon/xmon.c
+++ b/arch/ppc/xmon/xmon.c
@@ -153,6 +153,12 @@ static int xmon_trace[NR_CPUS];
 #define SSTEP  1               /* stepping because of 's' command */
 #define BRSTEP 2               /* stepping over breakpoint */
 
+#ifdef CONFIG_4xx
+#define MSR_SSTEP_ENABLE 0x200
+#else
+#define MSR_SSTEP_ENABLE 0x400
+#endif
+
 static struct pt_regs *xmon_regs[NR_CPUS];
 
 extern inline void sync(void)
@@ -211,6 +217,14 @@ static void get_tb(unsigned *p)
        p[1] = lo;
 }
 
+static inline void xmon_enable_sstep(struct pt_regs *regs)
+{
+       regs->msr |= MSR_SSTEP_ENABLE;
+#ifdef CONFIG_4xx
+       mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
+#endif
+}
+
 int xmon(struct pt_regs *excp)
 {
        struct pt_regs regs;
@@ -254,10 +268,10 @@ int xmon(struct pt_regs *excp)
        cmd = cmds(excp);
        if (cmd == 's') {
                xmon_trace[smp_processor_id()] = SSTEP;
-               excp->msr |= 0x400;
+               xmon_enable_sstep(excp);
        } else if (at_breakpoint(excp->nip)) {
                xmon_trace[smp_processor_id()] = BRSTEP;
-               excp->msr |= 0x400;
+               xmon_enable_sstep(excp);
        } else {
                xmon_trace[smp_processor_id()] = 0;
                insert_bpts();
@@ -298,7 +312,7 @@ xmon_bpt(struct pt_regs *regs)
                remove_bpts();
                excprint(regs);
                xmon_trace[smp_processor_id()] = BRSTEP;
-               regs->msr |= 0x400;
+               xmon_enable_sstep(regs);
        } else {
                xmon(regs);
        }
@@ -385,7 +399,7 @@ insert_bpts(void)
                }
                store_inst((void *) bp->address);
        }
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
        if (dabr.enabled)
                set_dabr(dabr.address);
        if (iabr.enabled)
@@ -400,7 +414,7 @@ remove_bpts(void)
        struct bpt *bp;
        unsigned instr;
 
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
        set_dabr(0);
        set_iabr(0);
 #endif
@@ -677,7 +691,7 @@ bpt_cmds(void)
 
        cmd = inchar();
        switch (cmd) {
-#if !defined(CONFIG_8xx)
+#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
        case 'd':
                mode = 7;
                cmd = inchar();