[PATCH] powerpc: Add the ability to handle SOC ports in legacy_serial

Add the ability to configure and initialize legacy 8250 serials
ports on an SOC bus.  Also, fixed an issue that we would not
configure any serial ports if "linux,stdout-path" was not found.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 52 insertions, 10 deletions

diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index d179ec502292..59164ba2eb1c 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -36,7 +36,8 @@ 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)
+                                  phys_addr_t taddr, unsigned long irq,
+                                  unsigned int flags)
 {
         u32 *clk, *spd, clock = BASE_BAUD * 16;
         int index;
@@ -90,7 +91,7 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
         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_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;
@@ -107,6 +108,32 @@ static int __init add_legacy_port(struct device_node *np, int want_index,
         return index;
 }
 
+static int __init add_legacy_soc_port(struct device_node *np,
+                                      struct device_node *soc_dev)
+{
+        phys_addr_t addr;
+        u32 *addrp;
+        unsigned int 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_bridge)
 {
@@ -137,7 +164,7 @@ static int __init add_legacy_isa_port(struct device_node *np,
         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);
+        return add_legacy_port(np, index, UPIO_PORT, reg[1], taddr, NO_IRQ, UPF_BOOT_AUTOCONF);
 
 }
 
@@ -204,7 +231,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
         /* 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);
+        return add_legacy_port(np, index, iotype, base, addr, NO_IRQ, UPF_BOOT_AUTOCONF);
 }
 
 /*
@@ -218,7 +245,7 @@ static int __init add_legacy_pci_port(struct device_node *np,
  */
 void __init find_legacy_serial_ports(void)
 {
-        struct device_node *np, *stdout;
+        struct device_node *np, *stdout = NULL;
         char *path;
         int index;
 
@@ -226,13 +253,23 @@ void __init find_legacy_serial_ports(void)
 
         /* Now find out if one of these is out firmware console */
         path = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
-        if (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");
-                return;
         }
-        stdout = of_find_node_by_path(path);
-        if (stdout) {
-                DBG("stdout is %s\n", stdout->full_name);
+
+        /* 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 */
@@ -437,6 +474,11 @@ static int __init check_legacy_serial_console(void)
                 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);