#include #include #include #include #include #include #include #include #include #include #include #include #include #include #undef DEBUG #ifdef DEBUG #define DBG(fmt...) do { printk(fmt); } while(0) #else #define DBG(fmt...) do { } while(0) #endif #define MAX_LEGACY_SERIAL_PORTS 8 static struct plat_serial8250_port legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1]; static struct legacy_serial_info { struct device_node *np; unsigned int speed; unsigned int clock; phys_addr_t taddr; } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; static unsigned int legacy_serial_count; static int legacy_serial_console = -1; static int __init add_legacy_port(struct device_node *np, int want_index, int iotype, phys_addr_t base, phys_addr_t taddr, unsigned long irq) { u32 *clk, *spd, clock; int index; /* get clock freq. if present */ clk = (u32 *)get_property(np, "clock-frequency", NULL); clock = clk ? *clk : BASE_BAUD * 16; /* get default speed if present */ spd = (u32 *)get_property(np, "current-speed", NULL); /* If we have a location index, then try to use it */ if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS) index = want_index; else index = legacy_serial_count; /* if our index is still out of range, that mean that * array is full, we could scan for a free slot but that * make little sense to bother, just skip the port */ if (index >= MAX_LEGACY_SERIAL_PORTS) return -1; if (index >= legacy_serial_count) legacy_serial_count = index + 1; /* Check if there is a port who already claimed our slot */ if (legacy_serial_infos[index].np != 0) { /* if we still have some room, move it, else override */ if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) { printk(KERN_INFO "Moved legacy port %d -> %d\n", index, legacy_serial_count); legacy_serial_ports[legacy_serial_count] = legacy_serial_ports[index]; legacy_serial_infos[legacy_serial_count] = legacy_serial_infos[index]; legacy_serial_count++; } else { printk(KERN_INFO "Replacing legacy port %d\n", index); } } /* Now fill the entry */ memset(&legacy_serial_ports[index], 0, sizeof(struct plat_serial8250_port)); if (iotype == UPIO_PORT) legacy_serial_ports[index].iobase = base; else legacy_serial_ports[index].membase = (void __iomem *)base; legacy_serial_ports[index].iotype = iotype; legacy_serial_ports[index].uartclk = clock; legacy_serial_ports[index].irq = irq; legacy_serial_ports[index].flags = ASYNC_BOOT_AUTOCONF; legacy_serial_infos[index].taddr = taddr; legacy_serial_infos[index].np = of_node_get(np); legacy_serial_infos[index].clock = clock; legacy_serial_infos[index].speed = spd ? *spd : 0; printk(KERN_INFO "Found legacy serial port %d for %s\n", index, np->full_name); printk(KERN_INFO " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n", (iotype == UPIO_PORT) ? "port" : "mem", (unsigned long long)base, (unsigned long long)taddr, irq, legacy_serial_ports[index].uartclk, legacy_serial_infos[index].speed); return index; } static int __init add_legacy_isa_port(struct device_node *np, struct device_node *isa_bridge) { u32 *reg; char *typep; int index = -1; phys_addr_t taddr; /* Get the ISA port number */ reg = (u32 *)get_property(np, "reg", NULL); if (reg == NULL) return -1; /* Verify it's an IO port, we don't support anything else */ if (!(reg[0] & 0x00000001)) return -1; /* Now look for an "ibm,aix-loc" property that gives us ordering * if any... */ typep = (char *)get_property(np, "ibm,aix-loc", NULL); /* If we have a location index, then use it */ if (typep && *typep == 'S') index = simple_strtol(typep+1, NULL, 0) - 1; /* Translate ISA address */ taddr = of_translate_address(np, reg); /* Add port, irq will be dealt with later */ return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, NO_IRQ); } static int __init add_legacy_pci_port(struct device_node *np, struct device_node *pci_dev) { phys_addr_t addr, base; u32 *addrp; int iotype, index = -1; #if 0 /* We only support ports that have a clock frequency properly * encoded in the device-tree (that is have an fcode). Anything * else can't be used that early and will be normally probed by * the generic 8250_pci driver later on. */ if (get_property(np, "clock-frequency", NULL) == NULL) return -1; #endif /* Get the PCI address. Assume BAR 0 */ addrp = of_get_pci_address(pci_dev, 0, NULL); if (addrp == NULL) return -1; /* We only support BAR 0 for now */ iotype = (addrp[0] & 0x02000000) ? UPIO_MEM : UPIO_PORT; addr = of_translate_address(pci_dev, addrp); /* Set the IO base to the same as the translated address for MMIO, * or to the domain local IO base for PIO (it will be fixed up later) */ if (iotype == UPIO_MEM) base = addr; else base = addrp[2]; /* Try to guess an index... If we have subdevices of the pci dev, * we get to their "reg" property */ if (np != pci_dev) { u32 *reg = (u32 *)get_property(np, "reg", NULL); if (reg && (*reg < 4)) index = legacy_serial_count + *reg; } /* Add port, irq will be dealt with later. We passed a translated * IO port value. It will be fixed up later along with the irq */ return add_legacy_port(np, index, iotype, base, addr, NO_IRQ); } /* * This is called very early, as part of setup_system() or eventually * setup_arch(), basically before anything else in this file. This function * will try to build a list of all the available 8250-compatible serial ports * in the machine using the Open Firmware device-tree. It currently only deals * with ISA and PCI busses but could be extended. It allows a very early boot * console to be initialized, that list is also used later to provide 8250 with * the machine non-PCI ports and to properly pick the default console port */ void __init find_legacy_serial_ports(void) { struct device_node *np, *stdout; char *path; int index; DBG(" -> find_legacy_serial_port()\n"); /* Now find out if one of these is out firmware console */ path = (char *)get_property(of_chosen, "linux,stdout-path", NULL); if (path == NULL) { DBG(" no linux,stdout-path !\n"); return; } stdout = of_find_node_by_path(path); if (stdout) { DBG("stdout is %s\n", stdout->full_name); } /* First fill our array with ISA ports */ for (np = NULL; (np = of_find_node_by_type(np, "serial"));) { struct device_node *isa = of_get_parent(np); if (isa && !strcmp(isa->name, "isa")) { index = add_legacy_isa_port(np, isa); if (index >= 0 && np == stdout) legacy_serial_console = index; } of_node_put(isa); } /* Next, try to locate PCI ports */ for (np = NULL; (np = of_find_all_nodes(np));) { struct device_node *pci, *parent = of_get_parent(np); if (parent && !strcmp(parent->name, "isa")) { of_node_put(parent); continue; } if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) { of_node_put(parent); continue; } /* Check for known pciclass, and also check wether we have * a device with child nodes for ports or not */ if (device_is_compatible(np, "pciclass,0700") || device_is_compatible(np, "pciclass,070002")) pci = np; else if (device_is_compatible(parent, "pciclass,0700") || device_is_compatible(parent, "pciclass,070002")) pci = parent; else { of_node_put(parent); continue; } index = add_legacy_pci_port(np, pci); if (index >= 0 && np == stdout) legacy_serial_console = index; of_node_put(parent); } DBG("legacy_serial_console = %d\n", legacy_serial_console); /* udbg is 64 bits only for now, that will change soon though ... */ #ifdef CONFIG_PPC64 while (legacy_serial_console >= 0) { struct legacy_serial_info *info = &legacy_serial_infos[legacy_serial_console]; void __iomem *addr; if (info->taddr == 0) break; addr = ioremap(info->taddr, 0x1000); if (addr == NULL) break; if (info->speed == 0) info->speed = udbg_probe_uart_speed(addr, info->clock); DBG("default console speed = %d\n", info->speed); udbg_init_uart(addr, info->speed, info->clock); break; } #endif /* CONFIG_PPC64 */ DBG(" <- find_legacy_serial_port()\n"); } static struct platform_device serial_device = { .name = "serial8250", .id = PLAT8250_DEV_PLATFORM, .dev = { .platform_data = legacy_serial_ports, }, }; static void __init fixup_port_irq(int index, struct device_node *np, struct plat_serial8250_port *port) { DBG("fixup_port_irq(%d)\n", index); /* Check for interrupts in that node */ if (np->n_intrs > 0) { port->irq = np->intrs[0].line; DBG(" port %d (%s), irq=%d\n", index, np->full_name, port->irq); return; } /* Check for interrupts in the parent */ np = of_get_parent(np); if (np == NULL) return; if (np->n_intrs > 0) { port->irq = np->intrs[0].line; DBG(" port %d (%s), irq=%d\n", index, np->full_name, port->irq); } of_node_put(np); } static void __init fixup_port_pio(int index, struct device_node *np, struct plat_serial8250_port *port) { struct pci_controller *hose; DBG("fixup_port_pio(%d)\n", index); hose = pci_find_hose_for_OF_device(np); if (hose) { unsigned long offset = (unsigned long)hose->io_base_virt - #ifdef CONFIG_PPC64 pci_io_base; #else isa_io_base; #endif DBG("port %d, IO %lx -> %lx\n", index, port->iobase, port->iobase + offset); port->iobase += offset; } } /* * This is called as an arch initcall, hopefully before the PCI bus is * probed and/or the 8250 driver loaded since we need to register our * platform devices before 8250 PCI ones are detected as some of them * must properly "override" the platform ones. * * This function fixes up the interrupt value for platform ports as it * couldn't be done earlier before interrupt maps have been parsed. It * also "corrects" the IO address for PIO ports for the same reason, * since earlier, the PHBs virtual IO space wasn't assigned yet. It then * registers all those platform ports for use by the 8250 driver when it * finally loads. */ static int __init serial_dev_init(void) { int i; if (legacy_serial_count == 0) return -ENODEV; /* * Before we register the platfrom serial devices, we need * to fixup their interrutps and their IO ports. */ DBG("Fixing serial ports interrupts and IO ports ...\n"); for (i = 0; i < legacy_serial_count; i++) { struct plat_serial8250_port *port = &legacy_serial_ports[i]; struct device_node *np = legacy_serial_infos[i].np; if (port->irq == NO_IRQ) fixup_port_irq(i, np, port); if (port->iotype == UPIO_PORT) fixup_port_pio(i, np, port); } DBG("Registering platform serial ports\n"); return platform_device_register(&serial_device); } arch_initcall(serial_dev_init); /* * This is called very early, as part of console_init() (typically just after * time_init()). This function is respondible for trying to find a good * default console on serial ports. It tries to match the open firmware * default output with one of the available serial console drivers, either * one of the platform serial ports that have been probed earlier by * find_legacy_serial_ports() or some more platform specific ones. */ static int __init check_legacy_serial_console(void) { struct device_node *prom_stdout = NULL; int speed = 0, offset = 0; char *name; u32 *spd; DBG(" -> check_legacy_serial_console()\n"); /* The user has requested a console so this is already set up. */ if (strstr(saved_command_line, "console=")) { DBG(" console was specified !\n"); return -EBUSY; } if (!of_chosen) { DBG(" of_chosen is NULL !\n"); return -ENODEV; } /* We are getting a weird phandle from OF ... */ /* ... So use the full path instead */ name = (char *)get_property(of_chosen, "linux,stdout-path", NULL); if (name == NULL) { DBG(" no linux,stdout-path !\n"); return -ENODEV; } prom_stdout = of_find_node_by_path(name); if (!prom_stdout) { DBG(" can't find stdout package %s !\n", name); return -ENODEV; } DBG("stdout is %s\n", prom_stdout->full_name); name = (char *)get_property(prom_stdout, "name", NULL); if (!name) { DBG(" stdout package has no name !\n"); goto not_found; } spd = (u32 *)get_property(prom_stdout, "current-speed", NULL); if (spd) speed = *spd; if (0) ; #ifdef CONFIG_SERIAL_8250_CONSOLE else if (strcmp(name, "serial") == 0) { int i; /* Look for it in probed array */ for (i = 0; i < legacy_serial_count; i++) { if (prom_stdout != legacy_serial_infos[i].np) continue; offset = i; speed = legacy_serial_infos[i].speed; break; } if (i >= legacy_serial_count) goto not_found; } #endif /* CONFIG_SERIAL_8250_CONSOLE */ #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE else if (strcmp(name, "ch-a") == 0) offset = 0; else if (strcmp(name, "ch-b") == 0) offset = 1; #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ else goto not_found; of_node_put(prom_stdout); DBG("Found serial console at ttyS%d\n", offset); if (speed) { static char __initdata opt[16]; sprintf(opt, "%d", speed); return add_preferred_console("ttyS", offset, opt); } else return add_preferred_console("ttyS", offset, NULL); not_found: DBG("No preferred console found !\n"); of_node_put(prom_stdout); return -ENODEV; } console_initcall(check_legacy_serial_console);