/* * 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 #define WANT_PPCDBG_TAB /* Only defined here */ #include #include #include #include #include #include #include #include #include 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') udbg_maple_real_putc('\r'); } } 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') udbg_putc('\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); }