diff options
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r-- | arch/powerpc/kernel/Makefile | 6 | ||||
-rw-r--r-- | arch/powerpc/kernel/udbg.c | 125 | ||||
-rw-r--r-- | arch/powerpc/kernel/udbg_16550.c | 123 | ||||
-rw-r--r-- | arch/powerpc/kernel/udbg_scc.c | 135 |
4 files changed, 388 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index c04bbd32059..c68eace12a9 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -16,7 +16,7 @@ obj-y := semaphore.o cputable.o ptrace.o syscalls.o \ obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \ signal_64.o ptrace32.o systbl.o \ paca.o ioctl32.o cpu_setup_power4.o \ - firmware.o sysfs.o + firmware.o sysfs.o udbg.o obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o obj-$(CONFIG_POWER4) += idle_power4.o obj-$(CONFIG_PPC_OF) += of_device.o @@ -29,6 +29,10 @@ obj-$(CONFIG_RTAS_PROC) += rtas-proc.o obj-$(CONFIG_LPARCFG) += lparcfg.o obj-$(CONFIG_IBMVIO) += vio.o obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o +obj-$(CONFIG_PPC_PSERIES) += udbg_16550.o +obj-$(CONFIG_PPC_MAPLE) += udbg_16550.o +udbgscc-$(CONFIG_PPC64) := udbg_scc.o +obj-$(CONFIG_PPC_PMAC) += $(udbgscc-y) ifeq ($(CONFIG_PPC_MERGE),y) diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c new file mode 100644 index 00000000000..0d878e72fc4 --- /dev/null +++ b/arch/powerpc/kernel/udbg.c @@ -0,0 +1,125 @@ +/* + * polling mode stateless debugging stuff, originally for NS16550 Serial Ports + * + * 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> +#include <linux/config.h> +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/console.h> +#include <asm/processor.h> + +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 (udbg_putc) { + char c; + + if (s && *s != '\0') { + while ((c = *s++) != '\0') + udbg_putc(c); + } + } +#if 0 + else { + printk("%s", s); + } +#endif +} + +int udbg_write(const char *s, int n) +{ + int remain = n; + char c; + + if (!udbg_putc) + return 0; + + if (s && *s != '\0') { + while (((c = *s++) != '\0') && (remain-- > 0)) { + udbg_putc(c); + } + } + + return n - remain; +} + +int udbg_read(char *buf, int buflen) +{ + char c, *p = buf; + int i; + + if (!udbg_getc) + return 0; + + for (i = 0; i < buflen; ++i) { + do { + c = udbg_getc(); + } while (c == 0x11 || c == 0x13); + if (c == 0) + break; + *p++ = c; + } + + return i; +} + +#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); +} + +/* + * 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, +}; + +static int early_console_initialized; + +void __init disable_early_printk(void) +{ + if (!early_console_initialized) + return; + unregister_console(&udbg_console); + early_console_initialized = 0; +} + +/* called by setup_system */ +void register_early_udbg_console(void) +{ + early_console_initialized = 1; + register_console(&udbg_console); +} + +#if 0 /* if you want to use this as a regular output console */ +console_initcall(register_udbg_console); +#endif diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c new file mode 100644 index 00000000000..9313574ab93 --- /dev/null +++ b/arch/powerpc/kernel/udbg_16550.c @@ -0,0 +1,123 @@ +/* + * udbg for for NS16550 compatable serial ports + * + * Copyright (C) 2001-2005 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 <linux/config.h> +#include <linux/types.h> +#include <asm/udbg.h> +#include <asm/io.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; + +static void udbg_550_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') + udbg_550_putc('\r'); + } +} + +static int udbg_550_getc_poll(void) +{ + if (udbg_comport) { + if ((in_8(&udbg_comport->lsr) & LSR_DR) != 0) + return in_8(&udbg_comport->rbr); + else + return -1; + } + return -1; +} + +static unsigned char udbg_550_getc(void) +{ + if (udbg_comport) { + while ((in_8(&udbg_comport->lsr) & LSR_DR) == 0) + /* wait for char */; + return in_8(&udbg_comport->rbr); + } + return 0; +} + +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 */ + udbg_putc = udbg_550_putc; + udbg_getc = udbg_550_getc; + udbg_getc_poll = udbg_550_getc_poll; + } +} + +#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') + udbg_maple_real_putc('\r'); + } +} + +void udbg_init_maple_realmode(void) +{ + udbg_comport = (volatile struct NS16550 __iomem *)0xf40003f8; + + udbg_putc = udbg_maple_real_putc; + udbg_getc = NULL; + udbg_getc_poll = NULL; +} +#endif /* CONFIG_PPC_MAPLE */ diff --git a/arch/powerpc/kernel/udbg_scc.c b/arch/powerpc/kernel/udbg_scc.c new file mode 100644 index 00000000000..820c5355150 --- /dev/null +++ b/arch/powerpc/kernel/udbg_scc.c @@ -0,0 +1,135 @@ +/* + * udbg for for zilog scc ports as found on Apple PowerMacs + * + * Copyright (C) 2001-2005 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 <linux/config.h> +#include <linux/types.h> +#include <asm/udbg.h> +#include <asm/processor.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); + +#define SCC_TXRDY 4 +#define SCC_RXRDY 1 + +static volatile u8 __iomem *sccc; +static volatile u8 __iomem *sccd; + +static void udbg_scc_putc(unsigned char c) +{ + if (sccc) { + while ((in_8(sccc) & SCC_TXRDY) == 0) + ; + out_8(sccd, c); + if (c == '\n') + udbg_scc_putc('\r'); + } +} + +static int udbg_scc_getc_poll(void) +{ + if (sccc) { + if ((in_8(sccc) & SCC_RXRDY) != 0) + return in_8(sccd); + else + return -1; + } + return -1; +} + +static unsigned char udbg_scc_getc(void) +{ + if (sccc) { + while ((in_8(sccc) & SCC_RXRDY) == 0) + ; + return in_8(sccd); + } + return 0; +} + +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]); + + udbg_putc = udbg_scc_putc; + udbg_getc = udbg_scc_getc; + udbg_getc_poll = udbg_scc_getc_poll; + + udbg_puts("Hello World !\n"); +} + +static void udbg_real_scc_putc(unsigned char c) +{ + while ((real_readb(sccc) & SCC_TXRDY) == 0) + ; + real_writeb(c, sccd); + if (c == '\n') + udbg_real_scc_putc('\r'); +} + +void udbg_init_pmac_realmode(void) +{ + sccc = (volatile u8 __iomem *)0x80013020ul; + sccd = (volatile u8 __iomem *)0x80013030ul; + + udbg_putc = udbg_real_scc_putc; + udbg_getc = NULL; + udbg_getc_poll = NULL; +} |