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Diffstat (limited to 'arch/ppc64/kernel/udbg.c')
-rw-r--r--arch/ppc64/kernel/udbg.c300
1 files changed, 57 insertions, 243 deletions
diff --git a/arch/ppc64/kernel/udbg.c b/arch/ppc64/kernel/udbg.c
index c0da45540f0..ed6766e21f5 100644
--- a/arch/ppc64/kernel/udbg.c
+++ b/arch/ppc64/kernel/udbg.c
@@ -1,5 +1,5 @@
/*
- * NS16550 Serial Port (uart) debugging stuff.
+ * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
*
* c 2001 PPC 64 Team, IBM Corp
*
@@ -13,249 +13,24 @@
#define WANT_PPCDBG_TAB /* Only defined here */
#include <linux/config.h>
#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/console.h>
#include <asm/ppcdebug.h>
#include <asm/processor.h>
-#include <asm/uaccess.h>
-#include <asm/machdep.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/pmac_feature.h>
-extern u8 real_readb(volatile u8 __iomem *addr);
-extern void real_writeb(u8 data, volatile u8 __iomem *addr);
-
-struct NS16550 {
- /* this struct must be packed */
- unsigned char rbr; /* 0 */
- unsigned char ier; /* 1 */
- unsigned char fcr; /* 2 */
- unsigned char lcr; /* 3 */
- unsigned char mcr; /* 4 */
- unsigned char lsr; /* 5 */
- unsigned char msr; /* 6 */
- unsigned char scr; /* 7 */
-};
-
-#define thr rbr
-#define iir fcr
-#define dll rbr
-#define dlm ier
-#define dlab lcr
-
-#define LSR_DR 0x01 /* Data ready */
-#define LSR_OE 0x02 /* Overrun */
-#define LSR_PE 0x04 /* Parity error */
-#define LSR_FE 0x08 /* Framing error */
-#define LSR_BI 0x10 /* Break */
-#define LSR_THRE 0x20 /* Xmit holding register empty */
-#define LSR_TEMT 0x40 /* Xmitter empty */
-#define LSR_ERR 0x80 /* Error */
-
-static volatile struct NS16550 __iomem *udbg_comport;
-
-void udbg_init_uart(void __iomem *comport, unsigned int speed)
-{
- u16 dll = speed ? (115200 / speed) : 12;
-
- if (comport) {
- udbg_comport = (struct NS16550 __iomem *)comport;
- out_8(&udbg_comport->lcr, 0x00);
- out_8(&udbg_comport->ier, 0xff);
- out_8(&udbg_comport->ier, 0x00);
- out_8(&udbg_comport->lcr, 0x80); /* Access baud rate */
- out_8(&udbg_comport->dll, dll & 0xff); /* 1 = 115200, 2 = 57600,
- 3 = 38400, 12 = 9600 baud */
- out_8(&udbg_comport->dlm, dll >> 8); /* dll >> 8 which should be zero
- for fast rates; */
- out_8(&udbg_comport->lcr, 0x03); /* 8 data, 1 stop, no parity */
- out_8(&udbg_comport->mcr, 0x03); /* RTS/DTR */
- out_8(&udbg_comport->fcr ,0x07); /* Clear & enable FIFOs */
- }
-}
-
-#ifdef CONFIG_PPC_PMAC
-
-#define SCC_TXRDY 4
-#define SCC_RXRDY 1
-
-static volatile u8 __iomem *sccc;
-static volatile u8 __iomem *sccd;
-
-static unsigned char scc_inittab[] = {
- 13, 0, /* set baud rate divisor */
- 12, 0,
- 14, 1, /* baud rate gen enable, src=rtxc */
- 11, 0x50, /* clocks = br gen */
- 5, 0xea, /* tx 8 bits, assert DTR & RTS */
- 4, 0x46, /* x16 clock, 1 stop */
- 3, 0xc1, /* rx enable, 8 bits */
-};
-
-void udbg_init_scc(struct device_node *np)
-{
- u32 *reg;
- unsigned long addr;
- int i, x;
-
- if (np == NULL)
- np = of_find_node_by_name(NULL, "escc");
- if (np == NULL || np->parent == NULL)
- return;
-
- udbg_printf("found SCC...\n");
- /* Get address within mac-io ASIC */
- reg = (u32 *)get_property(np, "reg", NULL);
- if (reg == NULL)
- return;
- addr = reg[0];
- udbg_printf("local addr: %lx\n", addr);
- /* Get address of mac-io PCI itself */
- reg = (u32 *)get_property(np->parent, "assigned-addresses", NULL);
- if (reg == NULL)
- return;
- addr += reg[2];
- udbg_printf("final addr: %lx\n", addr);
-
- /* Setup for 57600 8N1 */
- addr += 0x20;
- sccc = (volatile u8 * __iomem) ioremap(addr & PAGE_MASK, PAGE_SIZE) ;
- sccc += addr & ~PAGE_MASK;
- sccd = sccc + 0x10;
-
- udbg_printf("ioremap result sccc: %p\n", sccc);
- mb();
-
- for (i = 20000; i != 0; --i)
- x = in_8(sccc);
- out_8(sccc, 0x09); /* reset A or B side */
- out_8(sccc, 0xc0);
- for (i = 0; i < sizeof(scc_inittab); ++i)
- out_8(sccc, scc_inittab[i]);
-
- ppc_md.udbg_putc = udbg_putc;
- ppc_md.udbg_getc = udbg_getc;
- ppc_md.udbg_getc_poll = udbg_getc_poll;
-
- udbg_puts("Hello World !\n");
-}
-
-#endif /* CONFIG_PPC_PMAC */
-
-#ifdef CONFIG_PPC_PMAC
-static void udbg_real_putc(unsigned char c)
-{
- while ((real_readb(sccc) & SCC_TXRDY) == 0)
- ;
- real_writeb(c, sccd);
- if (c == '\n')
- udbg_real_putc('\r');
-}
-
-void udbg_init_pmac_realmode(void)
-{
- sccc = (volatile u8 __iomem *)0x80013020ul;
- sccd = (volatile u8 __iomem *)0x80013030ul;
-
- ppc_md.udbg_putc = udbg_real_putc;
- ppc_md.udbg_getc = NULL;
- ppc_md.udbg_getc_poll = NULL;
-}
-#endif /* CONFIG_PPC_PMAC */
-
-#ifdef CONFIG_PPC_MAPLE
-void udbg_maple_real_putc(unsigned char c)
-{
- if (udbg_comport) {
- while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
- /* wait for idle */;
- real_writeb(c, &udbg_comport->thr); eieio();
- if (c == '\n') {
- /* Also put a CR. This is for convenience. */
- while ((real_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
- /* wait for idle */;
- real_writeb('\r', &udbg_comport->thr); eieio();
- }
- }
-}
-
-void udbg_init_maple_realmode(void)
-{
- udbg_comport = (volatile struct NS16550 __iomem *)0xf40003f8;
-
- ppc_md.udbg_putc = udbg_maple_real_putc;
- ppc_md.udbg_getc = NULL;
- ppc_md.udbg_getc_poll = NULL;
-}
-#endif /* CONFIG_PPC_MAPLE */
-
-void udbg_putc(unsigned char c)
-{
- if (udbg_comport) {
- while ((in_8(&udbg_comport->lsr) & LSR_THRE) == 0)
- /* wait for idle */;
- out_8(&udbg_comport->thr, c);
- if (c == '\n') {
- /* Also put a CR. This is for convenience. */
- while ((in_8(&udbg_comport->lsr) & LSR_THRE) == 0)
- /* wait for idle */;
- out_8(&udbg_comport->thr, '\r');
- }
- }
-#ifdef CONFIG_PPC_PMAC
- else if (sccc) {
- while ((in_8(sccc) & SCC_TXRDY) == 0)
- ;
- out_8(sccd, c);
- if (c == '\n')
- udbg_putc('\r');
- }
-#endif /* CONFIG_PPC_PMAC */
-}
-
-int udbg_getc_poll(void)
-{
- if (udbg_comport) {
- if ((in_8(&udbg_comport->lsr) & LSR_DR) != 0)
- return in_8(&udbg_comport->rbr);
- else
- return -1;
- }
-#ifdef CONFIG_PPC_PMAC
- else if (sccc) {
- if ((in_8(sccc) & SCC_RXRDY) != 0)
- return in_8(sccd);
- else
- return -1;
- }
-#endif /* CONFIG_PPC_PMAC */
- return -1;
-}
-
-unsigned char udbg_getc(void)
-{
- if (udbg_comport) {
- while ((in_8(&udbg_comport->lsr) & LSR_DR) == 0)
- /* wait for char */;
- return in_8(&udbg_comport->rbr);
- }
-#ifdef CONFIG_PPC_PMAC
- else if (sccc) {
- while ((in_8(sccc) & SCC_RXRDY) == 0)
- ;
- return in_8(sccd);
- }
-#endif /* CONFIG_PPC_PMAC */
- return 0;
-}
+void (*udbg_putc)(unsigned char c);
+unsigned char (*udbg_getc)(void);
+int (*udbg_getc_poll)(void);
+/* udbg library, used by xmon et al */
void udbg_puts(const char *s)
{
- if (ppc_md.udbg_putc) {
+ if (udbg_putc) {
char c;
if (s && *s != '\0') {
while ((c = *s++) != '\0')
- ppc_md.udbg_putc(c);
+ udbg_putc(c);
}
}
#if 0
@@ -270,12 +45,12 @@ int udbg_write(const char *s, int n)
int remain = n;
char c;
- if (!ppc_md.udbg_putc)
+ if (!udbg_putc)
return 0;
if (s && *s != '\0') {
while (((c = *s++) != '\0') && (remain-- > 0)) {
- ppc_md.udbg_putc(c);
+ udbg_putc(c);
}
}
@@ -287,12 +62,12 @@ int udbg_read(char *buf, int buflen)
char c, *p = buf;
int i;
- if (!ppc_md.udbg_getc)
+ if (!udbg_getc)
return 0;
for (i = 0; i < buflen; ++i) {
do {
- c = ppc_md.udbg_getc();
+ c = udbg_getc();
} while (c == 0x11 || c == 0x13);
if (c == 0)
break;
@@ -302,11 +77,6 @@ int udbg_read(char *buf, int buflen)
return i;
}
-void udbg_console_write(struct console *con, const char *s, unsigned int n)
-{
- udbg_write(s, n);
-}
-
#define UDBG_BUFSIZE 256
void udbg_printf(const char *fmt, ...)
{
@@ -319,6 +89,10 @@ void udbg_printf(const char *fmt, ...)
va_end(args);
}
+/* PPCDBG stuff */
+
+u64 ppc64_debug_switch;
+
/* Special print used by PPCDBG() macro */
void udbg_ppcdbg(unsigned long debug_flags, const char *fmt, ...)
{
@@ -358,3 +132,43 @@ unsigned long udbg_ifdebug(unsigned long flags)
{
return (flags & ppc64_debug_switch);
}
+
+/*
+ * Initialize the PPCDBG state. Called before relocation has been enabled.
+ */
+void __init ppcdbg_initialize(void)
+{
+ ppc64_debug_switch = PPC_DEBUG_DEFAULT; /* | PPCDBG_BUSWALK | */
+ /* PPCDBG_PHBINIT | PPCDBG_MM | PPCDBG_MMINIT | PPCDBG_TCEINIT | PPCDBG_TCE */;
+}
+
+/*
+ * Early boot console based on udbg
+ */
+static void udbg_console_write(struct console *con, const char *s,
+ unsigned int n)
+{
+ udbg_write(s, n);
+}
+
+static struct console udbg_console = {
+ .name = "udbg",
+ .write = udbg_console_write,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+void __init disable_early_printk(void)
+{
+ unregister_console(&udbg_console);
+}
+
+/* called by setup_system */
+void register_early_udbg_console(void)
+{
+ register_console(&udbg_console);
+}
+
+#if 0 /* if you want to use this as a regular output console */
+console_initcall(register_udbg_console);
+#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-17 20:31:12 +0000