diff options
Diffstat (limited to 'arch/ppc64/kernel/udbg.c')
| -rw-r--r-- | arch/ppc64/kernel/udbg.c | 225 |
1 files changed, 1 insertions, 224 deletions
diff --git a/arch/ppc64/kernel/udbg.c b/arch/ppc64/kernel/udbg.c index b531583b88d..67e208500ae 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 * @@ -19,229 +19,6 @@ #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 */ - ppc_md.udbg_putc = udbg_putc; /* set access methods */ - ppc_md.udbg_getc = udbg_getc; - ppc_md.udbg_getc_poll = udbg_getc_poll; - } -} - -#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) { |