1 files changed, 478 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
new file mode 100644
index 000000000000..28ad50e424a9
--- /dev/null
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -0,0 +1,478 @@
+#include <linux/config.h>
+#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 <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;
+        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);
+