diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kernel/legacy_serial.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/kernel/legacy_serial.c | 616 |
1 files changed, 0 insertions, 616 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kernel/legacy_serial.c b/ANDROID_3.4.5/arch/powerpc/kernel/legacy_serial.c deleted file mode 100644 index bedd12e1..00000000 --- a/ANDROID_3.4.5/arch/powerpc/kernel/legacy_serial.c +++ /dev/null @@ -1,616 +0,0 @@ -#include <linux/kernel.h> -#include <linux/serial.h> -#include <linux/serial_8250.h> -#include <linux/serial_core.h> -#include <linux/console.h> -#include <linux/pci.h> -#include <linux/of_address.h> -#include <linux/of_device.h> -#include <linux/serial_reg.h> -#include <asm/io.h> -#include <asm/mmu.h> -#include <asm/prom.h> -#include <asm/serial.h> -#include <asm/udbg.h> -#include <asm/pci-bridge.h> -#include <asm/ppc-pci.h> - -#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; - int irq_check_parent; - phys_addr_t taddr; -} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS]; - -static struct __initdata of_device_id legacy_serial_parents[] = { - {.type = "soc",}, - {.type = "tsi-bridge",}, - {.type = "opb", }, - {.compatible = "ibm,opb",}, - {.compatible = "simple-bus",}, - {.compatible = "wrs,epld-localbus",}, - {}, -}; - -static unsigned int legacy_serial_count; -static int legacy_serial_console = -1; - -static unsigned int tsi_serial_in(struct uart_port *p, int offset) -{ - unsigned int tmp; - offset = offset << p->regshift; - if (offset == UART_IIR) { - tmp = readl(p->membase + (UART_IIR & ~3)); - return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */ - } else - return readb(p->membase + offset); -} - -static void tsi_serial_out(struct uart_port *p, int offset, int value) -{ - offset = offset << p->regshift; - if (!((offset == UART_IER) && (value & UART_IER_UUE))) - writeb(value, p->membase + offset); -} - -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, - upf_t flags, int irq_check_parent) -{ - const __be32 *clk, *spd; - u32 clock = BASE_BAUD * 16; - int index; - - /* get clock freq. if present */ - clk = of_get_property(np, "clock-frequency", NULL); - if (clk && *clk) - clock = be32_to_cpup(clk); - - /* get default speed if present */ - spd = of_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_DEBUG "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_DEBUG "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].mapbase = base; - - legacy_serial_ports[index].iotype = iotype; - legacy_serial_ports[index].uartclk = clock; - legacy_serial_ports[index].irq = irq; - legacy_serial_ports[index].flags = flags; - 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 ? be32_to_cpup(spd) : 0; - legacy_serial_infos[index].irq_check_parent = irq_check_parent; - - if (iotype == UPIO_TSI) { - legacy_serial_ports[index].serial_in = tsi_serial_in; - legacy_serial_ports[index].serial_out = tsi_serial_out; - } - - printk(KERN_DEBUG "Found legacy serial port %d for %s\n", - index, np->full_name); - printk(KERN_DEBUG " %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_soc_port(struct device_node *np, - struct device_node *soc_dev) -{ - u64 addr; - const u32 *addrp; - upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ - | UPF_FIXED_PORT; - struct device_node *tsi = of_get_parent(np); - - /* We only support ports that have a clock frequency properly - * encoded in the device-tree. - */ - if (of_get_property(np, "clock-frequency", NULL) == NULL) - return -1; - - /* if reg-shift or offset, don't try to use it */ - if ((of_get_property(np, "reg-shift", NULL) != NULL) || - (of_get_property(np, "reg-offset", NULL) != NULL)) - return -1; - - /* if rtas uses this device, don't try to use it as well */ - if (of_get_property(np, "used-by-rtas", NULL) != NULL) - return -1; - - /* Get the address */ - addrp = of_get_address(soc_dev, 0, NULL, NULL); - if (addrp == NULL) - return -1; - - addr = of_translate_address(soc_dev, addrp); - if (addr == OF_BAD_ADDR) - return -1; - - /* 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 - */ - if (tsi && !strcmp(tsi->type, "tsi-bridge")) - return add_legacy_port(np, -1, UPIO_TSI, addr, addr, NO_IRQ, flags, 0); - else - return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags, 0); -} - -static int __init add_legacy_isa_port(struct device_node *np, - struct device_node *isa_brg) -{ - const __be32 *reg; - const char *typep; - int index = -1; - u64 taddr; - - DBG(" -> add_legacy_isa_port(%s)\n", np->full_name); - - /* Get the ISA port number */ - reg = of_get_property(np, "reg", NULL); - if (reg == NULL) - return -1; - - /* Verify it's an IO port, we don't support anything else */ - if (!(be32_to_cpu(reg[0]) & 0x00000001)) - return -1; - - /* Now look for an "ibm,aix-loc" property that gives us ordering - * if any... - */ - typep = of_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. If it fails, we still register the port - * with no translated address so that it can be picked up as an IO - * port later by the serial driver - */ - taddr = of_translate_address(np, reg); - if (taddr == OF_BAD_ADDR) - taddr = 0; - - /* Add port, irq will be dealt with later */ - return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]), taddr, - NO_IRQ, UPF_BOOT_AUTOCONF, 0); - -} - -#ifdef CONFIG_PCI -static int __init add_legacy_pci_port(struct device_node *np, - struct device_node *pci_dev) -{ - u64 addr, base; - const u32 *addrp; - unsigned int flags; - int iotype, index = -1, lindex = 0; - - DBG(" -> add_legacy_pci_port(%s)\n", np->full_name); - - /* 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. The reason is that 8250 - * compatible UARTs on PCI need all sort of quirks (port offsets - * etc...) that this code doesn't know about - */ - if (of_get_property(np, "clock-frequency", NULL) == NULL) - return -1; - - /* Get the PCI address. Assume BAR 0 */ - addrp = of_get_pci_address(pci_dev, 0, NULL, &flags); - if (addrp == NULL) - return -1; - - /* We only support BAR 0 for now */ - iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT; - addr = of_translate_address(pci_dev, addrp); - if (addr == OF_BAD_ADDR) - return -1; - - /* 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) { - const __be32 *reg = of_get_property(np, "reg", NULL); - if (reg && (be32_to_cpup(reg) < 4)) - index = lindex = be32_to_cpup(reg); - } - - /* Local index means it's the Nth port in the PCI chip. Unfortunately - * the offset to add here is device specific. We know about those - * EXAR ports and we default to the most common case. If your UART - * doesn't work for these settings, you'll have to add your own special - * cases here - */ - if (of_device_is_compatible(pci_dev, "pci13a8,152") || - of_device_is_compatible(pci_dev, "pci13a8,154") || - of_device_is_compatible(pci_dev, "pci13a8,158")) { - addr += 0x200 * lindex; - base += 0x200 * lindex; - } else { - addr += 8 * lindex; - base += 8 * lindex; - } - - /* 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, - UPF_BOOT_AUTOCONF, np != pci_dev); -} -#endif - -static void __init setup_legacy_serial_console(int console) -{ - struct legacy_serial_info *info = - &legacy_serial_infos[console]; - void __iomem *addr; - - if (info->taddr == 0) - return; - addr = ioremap(info->taddr, 0x1000); - if (addr == NULL) - return; - 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); -} - -/* - * 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 = NULL; - const char *path; - int index; - - DBG(" -> find_legacy_serial_port()\n"); - - /* Now find out if one of these is out firmware console */ - path = of_get_property(of_chosen, "linux,stdout-path", NULL); - if (path != NULL) { - stdout = of_find_node_by_path(path); - if (stdout) - DBG("stdout is %s\n", stdout->full_name); - } else { - DBG(" no linux,stdout-path !\n"); - } - - /* Iterate over all the 16550 ports, looking for known parents */ - for_each_compatible_node(np, "serial", "ns16550") { - struct device_node *parent = of_get_parent(np); - if (!parent) - continue; - if (of_match_node(legacy_serial_parents, parent) != NULL) { - if (of_device_is_available(np)) { - index = add_legacy_soc_port(np, np); - if (index >= 0 && np == stdout) - legacy_serial_console = index; - } - } - of_node_put(parent); - } - - /* Next, fill our array with ISA ports */ - for_each_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); - } - -#ifdef CONFIG_PCI - /* 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 (of_device_is_compatible(np, "pciclass,0700") || - of_device_is_compatible(np, "pciclass,070002")) - pci = np; - else if (of_device_is_compatible(parent, "pciclass,0700") || - of_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); - } -#endif - - DBG("legacy_serial_console = %d\n", legacy_serial_console); - if (legacy_serial_console >= 0) - setup_legacy_serial_console(legacy_serial_console); - 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) -{ - unsigned int virq; - - DBG("fixup_port_irq(%d)\n", index); - - virq = irq_of_parse_and_map(np, 0); - if (virq == NO_IRQ && legacy_serial_infos[index].irq_check_parent) { - np = of_get_parent(np); - if (np == NULL) - return; - virq = irq_of_parse_and_map(np, 0); - of_node_put(np); - } - if (virq == NO_IRQ) - return; - - port->irq = virq; - -#ifdef CONFIG_SERIAL_8250_FSL - if (of_device_is_compatible(np, "fsl,ns16550")) - port->handle_irq = fsl8250_handle_irq; -#endif -} - -static void __init fixup_port_pio(int index, - struct device_node *np, - struct plat_serial8250_port *port) -{ -#ifdef CONFIG_PCI - 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; - } -#endif -} - -static void __init fixup_port_mmio(int index, - struct device_node *np, - struct plat_serial8250_port *port) -{ - DBG("fixup_port_mmio(%d)\n", index); - - port->membase = ioremap(port->mapbase, 0x100); -} - -/* - * 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 platform serial devices, we need - * to fixup their interrupts 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); - if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI)) - fixup_port_mmio(i, np, port); - } - - DBG("Registering platform serial ports\n"); - - return platform_device_register(&serial_device); -} -device_initcall(serial_dev_init); - - -#ifdef CONFIG_SERIAL_8250_CONSOLE -/* - * 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 that have - * been probed earlier by find_legacy_serial_ports() - */ -static int __init check_legacy_serial_console(void) -{ - struct device_node *prom_stdout = NULL; - int i, speed = 0, offset = 0; - const char *name; - const __be32 *spd; - - DBG(" -> check_legacy_serial_console()\n"); - - /* The user has requested a console so this is already set up. */ - if (strstr(boot_command_line, "console=")) { - DBG(" console was specified !\n"); - return -EBUSY; - } - - if (!of_chosen) { - DBG(" of_chosen is NULL !\n"); - return -ENODEV; - } - - if (legacy_serial_console < 0) { - DBG(" legacy_serial_console not found !\n"); - return -ENODEV; - } - /* We are getting a weird phandle from OF ... */ - /* ... So use the full path instead */ - name = of_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 = of_get_property(prom_stdout, "name", NULL); - if (!name) { - DBG(" stdout package has no name !\n"); - goto not_found; - } - spd = of_get_property(prom_stdout, "current-speed", NULL); - if (spd) - speed = be32_to_cpup(spd); - - if (strcmp(name, "serial") != 0) - goto not_found; - - /* 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; - - 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); - -#endif /* CONFIG_SERIAL_8250_CONSOLE */ |