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-rw-r--r--arch/ppc64/kernel/udbg.c360
1 files changed, 360 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/udbg.c b/arch/ppc64/kernel/udbg.c
new file mode 100644
index 000000000000..d4ccd6f1ef47
--- /dev/null
+++ b/arch/ppc64/kernel/udbg.c
@@ -0,0 +1,360 @@
+/*
+ * NS16550 Serial Port (uart) debugging stuff.
+ *
+ * c 2001 PPC 64 Team, IBM Corp
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <stdarg.h>
+#define WANT_PPCDBG_TAB /* Only defined here */
+#include <linux/config.h>
+#include <linux/types.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 */
+
+#if 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_puts(const char *s)
+{
+ if (ppc_md.udbg_putc) {
+ char c;
+
+ if (s && *s != '\0') {
+ while ((c = *s++) != '\0')
+ ppc_md.udbg_putc(c);
+ }
+ }
+#if 0
+ else {
+ printk("%s", s);
+ }
+#endif
+}
+
+int udbg_write(const char *s, int n)
+{
+ int remain = n;
+ char c;
+
+ if (!ppc_md.udbg_putc)
+ return 0;
+
+ if (s && *s != '\0') {
+ while (((c = *s++) != '\0') && (remain-- > 0)) {
+ ppc_md.udbg_putc(c);
+ }
+ }
+
+ return n - remain;
+}
+
+int udbg_read(char *buf, int buflen)
+{
+ char c, *p = buf;
+ int i;
+
+ if (!ppc_md.udbg_getc)
+ return 0;
+
+ for (i = 0; i < buflen; ++i) {
+ do {
+ c = ppc_md.udbg_getc();
+ } while (c == 0x11 || c == 0x13);
+ if (c == 0)
+ break;
+ *p++ = c;
+ }
+
+ 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, ...)
+{
+ unsigned char buf[UDBG_BUFSIZE];
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
+ udbg_puts(buf);
+ va_end(args);
+}
+
+/* Special print used by PPCDBG() macro */
+void udbg_ppcdbg(unsigned long debug_flags, const char *fmt, ...)
+{
+ unsigned long active_debugs = debug_flags & ppc64_debug_switch;
+
+ if (active_debugs) {
+ va_list ap;
+ unsigned char buf[UDBG_BUFSIZE];
+ unsigned long i, len = 0;
+
+ for (i=0; i < PPCDBG_NUM_FLAGS; i++) {
+ if (((1U << i) & active_debugs) &&
+ trace_names[i]) {
+ len += strlen(trace_names[i]);
+ udbg_puts(trace_names[i]);
+ break;
+ }
+ }
+
+ snprintf(buf, UDBG_BUFSIZE, " [%s]: ", current->comm);
+ len += strlen(buf);
+ udbg_puts(buf);
+
+ while (len < 18) {
+ udbg_puts(" ");
+ len++;
+ }
+
+ va_start(ap, fmt);
+ vsnprintf(buf, UDBG_BUFSIZE, fmt, ap);
+ udbg_puts(buf);
+ va_end(ap);
+ }
+}
+
+unsigned long udbg_ifdebug(unsigned long flags)
+{
+ return (flags & ppc64_debug_switch);
+}