[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / kernel / legacy_serial.c

#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,
				  upf_t flags)
{
	u32 *clk, *spd, clock = BASE_BAUD * 16;
	int index;

	/* get clock freq. if present */
	clk = (u32 *)get_property(np, "clock-frequency", NULL);
	if (clk && *clk)
		clock = *clk;

	/* 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].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 ? *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_soc_port(struct device_node *np,
				      struct device_node *soc_dev)
{
	phys_addr_t addr;
	u32 *addrp;
	upf_t flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;

	/* We only support ports that have a clock frequency properly
	 * encoded in the device-tree.
	 */
	if (get_property(np, "clock-frequency", 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);

	/* 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, -1, UPIO_MEM, addr, addr, NO_IRQ, flags);
}

static int __init add_legacy_isa_port(struct device_node *np,
				      struct device_node *isa_brg)
{
	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, UPF_BOOT_AUTOCONF);

}

#ifdef CONFIG_PCI
static int __init add_legacy_pci_port(struct device_node *np,
				      struct device_node *pci_dev)
{
	phys_addr_t addr, base;
	u32 *addrp;
	unsigned int flags;
	int iotype, index = -1, lindex = 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. 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 (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);

	/* 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 = lindex = *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 (device_is_compatible(pci_dev, "pci13a8,152") ||
	    device_is_compatible(pci_dev, "pci13a8,154") ||
	    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);
}
#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;
	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) {
		stdout = of_find_node_by_path(path);
		if (stdout)
			DBG("stdout is %s\n", stdout->full_name);
	} else {
		DBG(" no linux,stdout-path !\n");
	}

	/* First fill our array with SOC ports */
	for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
		struct device_node *soc = of_get_parent(np);
		if (soc && !strcmp(soc->type, "soc")) {
			index = add_legacy_soc_port(np, np);
			if (index >= 0 && np == stdout)
				legacy_serial_console = index;
		}
		of_node_put(soc);
	}

	/* 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);
	}

	/* First fill our array with tsi-bridge ports */
	for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
		struct device_node *tsi = of_get_parent(np);
		if (tsi && !strcmp(tsi->type, "tsi-bridge")) {
			index = add_legacy_soc_port(np, np);
			if (index >= 0 && np == stdout)
				legacy_serial_console = index;
		}
		of_node_put(tsi);
	}

#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 (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);
	}
#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)
{
	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)
{
#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 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);
		if (port->iotype == UPIO_MEM)
			fixup_port_mmio(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;
	}

	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 = (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);
Commit	Line	Data
463ce0e1 BH	1	#include <linux/kernel.h>
	2	#include <linux/serial.h>
	3	#include <linux/serial_8250.h>
	4	#include <linux/serial_core.h>
	5	#include <linux/console.h>
	6	#include <linux/pci.h>
	7	#include <asm/io.h>
	8	#include <asm/mmu.h>
	9	#include <asm/prom.h>
	10	#include <asm/serial.h>
	11	#include <asm/udbg.h>
	12	#include <asm/pci-bridge.h>
	13	#include <asm/ppc-pci.h>
	14
	15	#undef DEBUG
	16
	17	#ifdef DEBUG
	18	#define DBG(fmt...) do { printk(fmt); } while(0)
	19	#else
	20	#define DBG(fmt...) do { } while(0)
	21	#endif
	22
	23	#define MAX_LEGACY_SERIAL_PORTS 8
	24
	25	static struct plat_serial8250_port
	26	legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
	27	static struct legacy_serial_info {
	28	struct device_node *np;
	29	unsigned int speed;
	30	unsigned int clock;
	31	phys_addr_t taddr;
	32	} legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
	33	static unsigned int legacy_serial_count;
	34	static int legacy_serial_console = -1;
	35
	36	static int __init add_legacy_port(struct device_node *np, int want_index,
	37	int iotype, phys_addr_t base,
b580d46c	38	phys_addr_t taddr, unsigned long irq,
af308377	39	upf_t flags)
463ce0e1	40	{
8dacaedf	41	u32 clk, spd, clock = BASE_BAUD * 16;
463ce0e1 BH	42	int index;
	43
	44	/* get clock freq. if present */
	45	clk = (u32 *)get_property(np, "clock-frequency", NULL);
31df1678 DW	46	if (clk && *clk)
31df1678 DW	47	clock = *clk;
463ce0e1 BH	48
	49	/* get default speed if present */
	50	spd = (u32 *)get_property(np, "current-speed", NULL);
	51
	52	/* If we have a location index, then try to use it */
	53	if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
	54	index = want_index;
	55	else
	56	index = legacy_serial_count;
	57
	58	/* if our index is still out of range, that mean that
	59	* array is full, we could scan for a free slot but that
	60	* make little sense to bother, just skip the port
	61	*/
	62	if (index >= MAX_LEGACY_SERIAL_PORTS)
	63	return -1;
	64	if (index >= legacy_serial_count)
	65	legacy_serial_count = index + 1;
	66
	67	/* Check if there is a port who already claimed our slot */
	68	if (legacy_serial_infos[index].np != 0) {
	69	/* if we still have some room, move it, else override */
	70	if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
	71	printk(KERN_INFO "Moved legacy port %d -> %d\n",
	72	index, legacy_serial_count);
	73	legacy_serial_ports[legacy_serial_count] =
	74	legacy_serial_ports[index];
	75	legacy_serial_infos[legacy_serial_count] =
	76	legacy_serial_infos[index];
	77	legacy_serial_count++;
	78	} else {
	79	printk(KERN_INFO "Replacing legacy port %d\n", index);
	80	}
	81	}
	82
	83	/* Now fill the entry */
	84	memset(&legacy_serial_ports[index], 0,
	85	sizeof(struct plat_serial8250_port));
	86	if (iotype == UPIO_PORT)
	87	legacy_serial_ports[index].iobase = base;
	88	else
8dacaedf	89	legacy_serial_ports[index].mapbase = base;
463ce0e1 BH	90	legacy_serial_ports[index].iotype = iotype;
	91	legacy_serial_ports[index].uartclk = clock;
	92	legacy_serial_ports[index].irq = irq;
b580d46c	93	legacy_serial_ports[index].flags = flags;
463ce0e1 BH	94	legacy_serial_infos[index].taddr = taddr;
	95	legacy_serial_infos[index].np = of_node_get(np);
	96	legacy_serial_infos[index].clock = clock;
	97	legacy_serial_infos[index].speed = spd ? *spd : 0;
	98
	99	printk(KERN_INFO "Found legacy serial port %d for %s\n",
	100	index, np->full_name);
	101	printk(KERN_INFO " %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
	102	(iotype == UPIO_PORT) ? "port" : "mem",
	103	(unsigned long long)base, (unsigned long long)taddr, irq,
	104	legacy_serial_ports[index].uartclk,
	105	legacy_serial_infos[index].speed);
	106
	107	return index;
	108	}
	109
b580d46c KG	110	static int __init add_legacy_soc_port(struct device_node *np,
	111	struct device_node *soc_dev)
	112	{
	113	phys_addr_t addr;
	114	u32 *addrp;
af308377	115	upf_t flags = UPF_BOOT_AUTOCONF \| UPF_SKIP_TEST \| UPF_SHARE_IRQ;
b580d46c KG	116
	117	/* We only support ports that have a clock frequency properly
	118	* encoded in the device-tree.
	119	*/
	120	if (get_property(np, "clock-frequency", NULL) == NULL)
	121	return -1;
	122
	123	/* Get the address */
	124	addrp = of_get_address(soc_dev, 0, NULL, NULL);
	125	if (addrp == NULL)
	126	return -1;
	127
	128	addr = of_translate_address(soc_dev, addrp);
	129
	130	/* Add port, irq will be dealt with later. We passed a translated
	131	* IO port value. It will be fixed up later along with the irq
	132	*/
	133	return add_legacy_port(np, -1, UPIO_MEM, addr, addr, NO_IRQ, flags);
	134	}
	135
463ce0e1	136	static int __init add_legacy_isa_port(struct device_node *np,
017e0fad	137	struct device_node *isa_brg)
463ce0e1 BH	138	{
	139	u32 *reg;
	140	char *typep;
	141	int index = -1;
	142	phys_addr_t taddr;
	143
	144	/* Get the ISA port number */
	145	reg = (u32 *)get_property(np, "reg", NULL);
	146	if (reg == NULL)
	147	return -1;
	148
	149	/* Verify it's an IO port, we don't support anything else */
	150	if (!(reg[0] & 0x00000001))
	151	return -1;
	152
	153	/* Now look for an "ibm,aix-loc" property that gives us ordering
	154	* if any...
	155	*/
	156	typep = (char *)get_property(np, "ibm,aix-loc", NULL);
	157
	158	/* If we have a location index, then use it */
	159	if (typep && *typep == 'S')
	160	index = simple_strtol(typep+1, NULL, 0) - 1;
	161
	162	/* Translate ISA address */
	163	taddr = of_translate_address(np, reg);
	164
	165	/* Add port, irq will be dealt with later */
b580d46c	166	return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, NO_IRQ, UPF_BOOT_AUTOCONF);
463ce0e1 BH	167
	168	}
	169
017e0fad	170	#ifdef CONFIG_PCI
463ce0e1 BH	171	static int __init add_legacy_pci_port(struct device_node *np,
	172	struct device_node *pci_dev)
	173	{
	174	phys_addr_t addr, base;
	175	u32 *addrp;
d2dd482b	176	unsigned int flags;
8dacaedf	177	int iotype, index = -1, lindex = 0;
463ce0e1	178
463ce0e1 BH	179	/* We only support ports that have a clock frequency properly
	180	* encoded in the device-tree (that is have an fcode). Anything
	181	* else can't be used that early and will be normally probed by
8dacaedf BH	182	* the generic 8250_pci driver later on. The reason is that 8250
	183	* compatible UARTs on PCI need all sort of quirks (port offsets
	184	* etc...) that this code doesn't know about
463ce0e1 BH	185	*/
	186	if (get_property(np, "clock-frequency", NULL) == NULL)
	187	return -1;
463ce0e1 BH	188
463ce0e1 BH	189	/* Get the PCI address. Assume BAR 0 */
d2dd482b	190	addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
463ce0e1 BH	191	if (addrp == NULL)
	192	return -1;
	193
	194	/* We only support BAR 0 for now */
d2dd482b	195	iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
463ce0e1 BH	196	addr = of_translate_address(pci_dev, addrp);
	197
	198	/* Set the IO base to the same as the translated address for MMIO,
	199	* or to the domain local IO base for PIO (it will be fixed up later)
	200	*/
	201	if (iotype == UPIO_MEM)
	202	base = addr;
	203	else
	204	base = addrp[2];
	205
	206	/* Try to guess an index... If we have subdevices of the pci dev,
	207	* we get to their "reg" property
	208	*/
	209	if (np != pci_dev) {
	210	u32 reg = (u32 )get_property(np, "reg", NULL);
	211	if (reg && (*reg < 4))
8dacaedf BH	212	index = lindex = *reg;
	213	}
	214
	215	/* Local index means it's the Nth port in the PCI chip. Unfortunately
	216	* the offset to add here is device specific. We know about those
	217	* EXAR ports and we default to the most common case. If your UART
	218	* doesn't work for these settings, you'll have to add your own special
	219	* cases here
	220	*/
	221	if (device_is_compatible(pci_dev, "pci13a8,152") \|\|
	222	device_is_compatible(pci_dev, "pci13a8,154") \|\|
	223	device_is_compatible(pci_dev, "pci13a8,158")) {
	224	addr += 0x200 * lindex;
	225	base += 0x200 * lindex;
	226	} else {
	227	addr += 8 * lindex;
	228	base += 8 * lindex;
463ce0e1 BH	229	}
	230
	231	/* Add port, irq will be dealt with later. We passed a translated
	232	* IO port value. It will be fixed up later along with the irq
	233	*/
b580d46c	234	return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, UPF_BOOT_AUTOCONF);
463ce0e1	235	}
017e0fad	236	#endif
463ce0e1	237
37a801c7 MN	238	static void __init setup_legacy_serial_console(int console)
	239	{
	240	struct legacy_serial_info *info =
	241	&legacy_serial_infos[console];
	242	void __iomem *addr;
	243
	244	if (info->taddr == 0)
	245	return;
	246	addr = ioremap(info->taddr, 0x1000);
	247	if (addr == NULL)
	248	return;
	249	if (info->speed == 0)
	250	info->speed = udbg_probe_uart_speed(addr, info->clock);
	251	DBG("default console speed = %d\n", info->speed);
	252	udbg_init_uart(addr, info->speed, info->clock);
	253	}
	254
463ce0e1 BH	255	/*
	256	* This is called very early, as part of setup_system() or eventually
	257	* setup_arch(), basically before anything else in this file. This function
	258	* will try to build a list of all the available 8250-compatible serial ports
	259	* in the machine using the Open Firmware device-tree. It currently only deals
	260	* with ISA and PCI busses but could be extended. It allows a very early boot
	261	* console to be initialized, that list is also used later to provide 8250 with
	262	* the machine non-PCI ports and to properly pick the default console port
	263	*/
	264	void __init find_legacy_serial_ports(void)
	265	{
b580d46c	266	struct device_node np, stdout = NULL;
463ce0e1 BH	267	char *path;
	268	int index;
	269
	270	DBG(" -> find_legacy_serial_port()\n");
	271
	272	/* Now find out if one of these is out firmware console */
	273	path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
b580d46c KG	274	if (path != NULL) {
	275	stdout = of_find_node_by_path(path);
	276	if (stdout)
	277	DBG("stdout is %s\n", stdout->full_name);
	278	} else {
463ce0e1	279	DBG(" no linux,stdout-path !\n");
463ce0e1	280	}
b580d46c KG	281
	282	/* First fill our array with SOC ports */
	283	for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
	284	struct device_node *soc = of_get_parent(np);
	285	if (soc && !strcmp(soc->type, "soc")) {
	286	index = add_legacy_soc_port(np, np);
	287	if (index >= 0 && np == stdout)
	288	legacy_serial_console = index;
	289	}
	290	of_node_put(soc);
463ce0e1 BH	291	}
	292
	293	/* First fill our array with ISA ports */
	294	for (np = NULL; (np = of_find_node_by_type(np, "serial"));) {
	295	struct device_node *isa = of_get_parent(np);
	296	if (isa && !strcmp(isa->name, "isa")) {
	297	index = add_legacy_isa_port(np, isa);
	298	if (index >= 0 && np == stdout)
	299	legacy_serial_console = index;
	300	}
	301	of_node_put(isa);
	302	}
	303
c5d56332 ZR	304	/* First fill our array with tsi-bridge ports */
	305	for (np = NULL; (np = of_find_compatible_node(np, "serial", "ns16550")) != NULL;) {
	306	struct device_node *tsi = of_get_parent(np);
	307	if (tsi && !strcmp(tsi->type, "tsi-bridge")) {
	308	index = add_legacy_soc_port(np, np);
	309	if (index >= 0 && np == stdout)
	310	legacy_serial_console = index;
	311	}
	312	of_node_put(tsi);
	313	}
	314
017e0fad	315	#ifdef CONFIG_PCI
463ce0e1 BH	316	/* Next, try to locate PCI ports */
	317	for (np = NULL; (np = of_find_all_nodes(np));) {
	318	struct device_node pci, parent = of_get_parent(np);
	319	if (parent && !strcmp(parent->name, "isa")) {
	320	of_node_put(parent);
	321	continue;
	322	}
	323	if (strcmp(np->name, "serial") && strcmp(np->type, "serial")) {
	324	of_node_put(parent);
	325	continue;
	326	}
	327	/* Check for known pciclass, and also check wether we have
	328	* a device with child nodes for ports or not
	329	*/
	330	if (device_is_compatible(np, "pciclass,0700") \|\|
	331	device_is_compatible(np, "pciclass,070002"))
	332	pci = np;
	333	else if (device_is_compatible(parent, "pciclass,0700") \|\|
	334	device_is_compatible(parent, "pciclass,070002"))
	335	pci = parent;
	336	else {
	337	of_node_put(parent);
	338	continue;
	339	}
	340	index = add_legacy_pci_port(np, pci);
	341	if (index >= 0 && np == stdout)
	342	legacy_serial_console = index;
	343	of_node_put(parent);
	344	}
017e0fad	345	#endif
463ce0e1 BH	346
463ce0e1 BH	347	DBG("legacy_serial_console = %d\n", legacy_serial_console);
37a801c7 MN	348	if (legacy_serial_console >= 0)
37a801c7 MN	349	setup_legacy_serial_console(legacy_serial_console);
463ce0e1 BH	350	DBG(" <- find_legacy_serial_port()\n");
	351	}
	352
	353	static struct platform_device serial_device = {
	354	.name = "serial8250",
	355	.id = PLAT8250_DEV_PLATFORM,
	356	.dev = {
	357	.platform_data = legacy_serial_ports,
	358	},
	359	};
	360
	361	static void __init fixup_port_irq(int index,
	362	struct device_node *np,
	363	struct plat_serial8250_port *port)
	364	{
	365	DBG("fixup_port_irq(%d)\n", index);
	366
	367	/* Check for interrupts in that node */
	368	if (np->n_intrs > 0) {
	369	port->irq = np->intrs[0].line;
	370	DBG(" port %d (%s), irq=%d\n",
	371	index, np->full_name, port->irq);
	372	return;
	373	}
	374
	375	/* Check for interrupts in the parent */
	376	np = of_get_parent(np);
	377	if (np == NULL)
	378	return;
	379
	380	if (np->n_intrs > 0) {
	381	port->irq = np->intrs[0].line;
	382	DBG(" port %d (%s), irq=%d\n",
	383	index, np->full_name, port->irq);
	384	}
	385	of_node_put(np);
	386	}
	387
	388	static void __init fixup_port_pio(int index,
	389	struct device_node *np,
	390	struct plat_serial8250_port *port)
	391	{
017e0fad	392	#ifdef CONFIG_PCI
463ce0e1 BH	393	struct pci_controller *hose;
	394
	395	DBG("fixup_port_pio(%d)\n", index);
	396
	397	hose = pci_find_hose_for_OF_device(np);
	398	if (hose) {
	399	unsigned long offset = (unsigned long)hose->io_base_virt -
	400	#ifdef CONFIG_PPC64
	401	pci_io_base;
	402	#else
	403	isa_io_base;
	404	#endif
	405	DBG("port %d, IO %lx -> %lx\n",
	406	index, port->iobase, port->iobase + offset);
	407	port->iobase += offset;
	408	}
017e0fad	409	#endif
463ce0e1 BH	410	}
463ce0e1 BH	411
8dacaedf BH	412	static void __init fixup_port_mmio(int index,
	413	struct device_node *np,
	414	struct plat_serial8250_port *port)
	415	{
	416	DBG("fixup_port_mmio(%d)\n", index);
	417
	418	port->membase = ioremap(port->mapbase, 0x100);
	419	}
	420
463ce0e1 BH	421	/*
	422	* This is called as an arch initcall, hopefully before the PCI bus is
	423	* probed and/or the 8250 driver loaded since we need to register our
	424	* platform devices before 8250 PCI ones are detected as some of them
	425	* must properly "override" the platform ones.
	426	*
	427	* This function fixes up the interrupt value for platform ports as it
	428	* couldn't be done earlier before interrupt maps have been parsed. It
	429	* also "corrects" the IO address for PIO ports for the same reason,
	430	* since earlier, the PHBs virtual IO space wasn't assigned yet. It then
	431	* registers all those platform ports for use by the 8250 driver when it
	432	* finally loads.
	433	*/
	434	static int __init serial_dev_init(void)
	435	{
	436	int i;
	437
	438	if (legacy_serial_count == 0)
	439	return -ENODEV;
	440
	441	/*
	442	* Before we register the platfrom serial devices, we need
	443	* to fixup their interrutps and their IO ports.
	444	*/
	445	DBG("Fixing serial ports interrupts and IO ports ...\n");
	446
	447	for (i = 0; i < legacy_serial_count; i++) {
	448	struct plat_serial8250_port *port = &legacy_serial_ports[i];
	449	struct device_node *np = legacy_serial_infos[i].np;
	450
	451	if (port->irq == NO_IRQ)
	452	fixup_port_irq(i, np, port);
	453	if (port->iotype == UPIO_PORT)
	454	fixup_port_pio(i, np, port);
8dacaedf BH	455	if (port->iotype == UPIO_MEM)
8dacaedf BH	456	fixup_port_mmio(i, np, port);
463ce0e1 BH	457	}
	458
	459	DBG("Registering platform serial ports\n");
	460
	461	return platform_device_register(&serial_device);
	462	}
	463	arch_initcall(serial_dev_init);
	464
	465
	466	/*
	467	* This is called very early, as part of console_init() (typically just after
	468	* time_init()). This function is respondible for trying to find a good
	469	* default console on serial ports. It tries to match the open firmware
	470	* default output with one of the available serial console drivers, either
	471	* one of the platform serial ports that have been probed earlier by
	472	* find_legacy_serial_ports() or some more platform specific ones.
	473	*/
	474	static int __init check_legacy_serial_console(void)
	475	{
	476	struct device_node *prom_stdout = NULL;
	477	int speed = 0, offset = 0;
	478	char *name;
	479	u32 *spd;
	480
	481	DBG(" -> check_legacy_serial_console()\n");
	482
	483	/* The user has requested a console so this is already set up. */
	484	if (strstr(saved_command_line, "console=")) {
	485	DBG(" console was specified !\n");
	486	return -EBUSY;
	487	}
	488
	489	if (!of_chosen) {
	490	DBG(" of_chosen is NULL !\n");
	491	return -ENODEV;
	492	}
b580d46c KG	493
	494	if (legacy_serial_console < 0) {
	495	DBG(" legacy_serial_console not found !\n");
	496	return -ENODEV;
	497	}
463ce0e1 BH	498	/* We are getting a weird phandle from OF ... */
	499	/* ... So use the full path instead */
	500	name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
	501	if (name == NULL) {
	502	DBG(" no linux,stdout-path !\n");
	503	return -ENODEV;
	504	}
	505	prom_stdout = of_find_node_by_path(name);
	506	if (!prom_stdout) {
	507	DBG(" can't find stdout package %s !\n", name);
	508	return -ENODEV;
	509	}
	510	DBG("stdout is %s\n", prom_stdout->full_name);
	511
	512	name = (char *)get_property(prom_stdout, "name", NULL);
	513	if (!name) {
	514	DBG(" stdout package has no name !\n");
	515	goto not_found;
	516	}
	517	spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
	518	if (spd)
	519	speed = *spd;
	520
	521	if (0)
	522	;
	523	#ifdef CONFIG_SERIAL_8250_CONSOLE
	524	else if (strcmp(name, "serial") == 0) {
	525	int i;
	526	/* Look for it in probed array */
	527	for (i = 0; i < legacy_serial_count; i++) {
	528	if (prom_stdout != legacy_serial_infos[i].np)
	529	continue;
	530	offset = i;
	531	speed = legacy_serial_infos[i].speed;
	532	break;
	533	}
	534	if (i >= legacy_serial_count)
	535	goto not_found;
	536	}
	537	#endif /* CONFIG_SERIAL_8250_CONSOLE */
	538	#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
	539	else if (strcmp(name, "ch-a") == 0)
	540	offset = 0;
	541	else if (strcmp(name, "ch-b") == 0)
	542	offset = 1;
	543	#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
	544	else
	545	goto not_found;
	546	of_node_put(prom_stdout);
	547
	548	DBG("Found serial console at ttyS%d\n", offset);
	549
	550	if (speed) {
	551	static char __initdata opt[16];
	552	sprintf(opt, "%d", speed);
	553	return add_preferred_console("ttyS", offset, opt);
	554	} else
	555	return add_preferred_console("ttyS", offset, NULL);
	556
	557	not_found:
	558	DBG("No preferred console found !\n");
	559	of_node_put(prom_stdout);
	560	return -ENODEV;
	561	}
562	console_initcall(check_legacy_serial_console);
563