587 строки
16 KiB
C
587 строки
16 KiB
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 <linux/of_address.h>
|
|
#include <linux/of_device.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 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;
|
|
|
|
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;
|
|
}
|
|
|
|
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 */
|