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);
+