[ARM] 4271/1: iop32x: fix ep80219 detection (support iq80219 platforms)

An iq80219 is a board with an iq31244 layout and an 80219 processor.  It
breaks the current assumption that all 80219 processors run on ep80219
platforms.  This patch adds the "force_ep80219" option to the kernel to
override boot loaders that have passed in the iq31244 id, and adds the
MACHINE_START definition for ep80219.

[ patch assumes that EP80219 has been added to mach-types ]

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 55 insertions, 8 deletions

diff --git a/arch/arm/mach-iop32x/Kconfig b/arch/arm/mach-iop32x/Kconfig
index c072d94070da..9dd49cff21ff 100644
--- a/arch/arm/mach-iop32x/Kconfig
+++ b/arch/arm/mach-iop32x/Kconfig
@@ -4,6 +4,9 @@ menu "IOP32x Implementation Options"
 
 comment "IOP32x Platform Types"
 
+config MACH_EP80219
+        bool
+
 config MACH_GLANTANK
         bool "Enable support for the IO-Data GLAN Tank"
         help
@@ -19,6 +22,7 @@ config ARCH_IQ80321
 
 config ARCH_IQ31244
         bool "Enable support for EP80219/IQ31244"
+        select MACH_EP80219
         help
           Say Y here if you want to run your kernel on the Intel EP80219
           evaluation kit for the Intel 80219 processor (a IOP321 variant)
diff --git a/arch/arm/mach-iop32x/iq31244.c b/arch/arm/mach-iop32x/iq31244.c
index 571ac35bc2c7..60e74309a458 100644
--- a/arch/arm/mach-iop32x/iq31244.c
+++ b/arch/arm/mach-iop32x/iq31244.c
@@ -39,22 +39,35 @@
 #include <asm/arch/time.h>
 
 /*
- * The EP80219 and IQ31244 use the same machine ID.  To find out
- * which of the two we're running on, we look at the processor ID.
+ * Until March of 2007 iq31244 platforms and ep80219 platforms shared the
+ * same machine id, and the processor type was used to select board type.
+ * However this assumption breaks for an iq80219 board which is an iop219
+ * processor on an iq31244 board.  The force_ep80219 flag has been added
+ * for old boot loaders using the iq31244 machine id for an ep80219 platform.
  */
+static int force_ep80219;
+
 static int is_80219(void)
 {
         extern int processor_id;
         return !!((processor_id & 0xffffffe0) == 0x69052e20);
 }
 
+static int is_ep80219(void)
+{
+        if (machine_is_ep80219() || force_ep80219)
+                return 1;
+        else
+                return 0;
+}
+
 
 /*
  * EP80219/IQ31244 timer tick configuration.
  */
 static void __init iq31244_timer_init(void)
 {
-        if (is_80219()) {
+        if (is_ep80219()) {
                 /* 33.333 MHz crystal.  */
                 iop_init_time(200000000);
         } else {
@@ -165,12 +178,18 @@ static struct hw_pci iq31244_pci __initdata = {
 
 static int __init iq31244_pci_init(void)
 {
-        if (machine_is_iq31244()) {
+        if (is_ep80219())
+                pci_common_init(&ep80219_pci);
+        else if (machine_is_iq31244()) {
                 if (is_80219()) {
-                        pci_common_init(&ep80219_pci);
-                } else {
-                        pci_common_init(&iq31244_pci);
+                        printk("note: iq31244 board type has been selected\n");
+                        printk("note: to select ep80219 operation:\n");
+                        printk("\t1/ specify \"force_ep80219\" on the kernel"
+                                " command line\n");
+                        printk("\t2/ update boot loader to pass"
+                                " the ep80219 id: %d\n", MACH_TYPE_EP80219);
                 }
+                pci_common_init(&iq31244_pci);
         }
 
         return 0;
@@ -277,10 +296,18 @@ static void __init iq31244_init_machine(void)
         platform_device_register(&iq31244_flash_device);
         platform_device_register(&iq31244_serial_device);
 
-        if (is_80219())
+        if (is_ep80219())
                 pm_power_off = ep80219_power_off;
 }
 
+static int __init force_ep80219_setup(char *str)
+{
+        force_ep80219 = 1;
+        return 1;
+}
+
+__setup("force_ep80219", force_ep80219_setup);
+
 MACHINE_START(IQ31244, "Intel IQ31244")
         /* Maintainer: Intel Corp. */
         .phys_io        = IQ31244_UART,
@@ -291,3 +318,19 @@ MACHINE_START(IQ31244, "Intel IQ31244")
         .timer          = &iq31244_timer,
         .init_machine   = iq31244_init_machine,
 MACHINE_END
+
+/* There should have been an ep80219 machine identifier from the beginning.
+ * Boot roms older than March 2007 do not know the ep80219 machine id.  Pass
+ * "force_ep80219" on the kernel command line, otherwise iq31244 operation
+ * will be selected.
+ */
+MACHINE_START(EP80219, "Intel EP80219")
+        /* Maintainer: Intel Corp. */
+        .phys_io        = IQ31244_UART,
+        .io_pg_offst    = ((IQ31244_UART) >> 18) & 0xfffc,
+        .boot_params    = 0xa0000100,
+        .map_io         = iq31244_map_io,
+        .init_irq       = iop32x_init_irq,
+        .timer          = &iq31244_timer,
+        .init_machine   = iq31244_init_machine,
+MACHINE_END