ARM: 6771/1: vexpress: add support for multiple core tiles
The current Versatile Express BSP defines the MACHINE_START macro
in the core tile code.
This patch moves this into the generic board code and introduces a
method for determining the current tile at runtime, allowing the
Kernel to have support for multiple tiles compiled in. Tile-specific
functions are executed via a descriptor struct containing the correct
implementations for the current tile.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
index 63ef663..ba46e8e 100644
--- a/arch/arm/mach-vexpress/v2m.c
+++ b/arch/arm/mach-vexpress/v2m.c
@@ -14,7 +14,9 @@
#include <linux/usb/isp1760.h>
#include <linux/clkdev.h>
+#include <asm/mach-types.h>
#include <asm/sizes.h>
+#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
@@ -22,6 +24,7 @@
#include <asm/hardware/timer-sp.h>
#include <asm/hardware/sp810.h>
+#include <mach/ct-ca9x4.h>
#include <mach/motherboard.h>
#include <plat/sched_clock.h>
@@ -43,14 +46,9 @@
},
};
-void __init v2m_map_io(struct map_desc *tile, size_t num)
+static void __init v2m_init_early(void)
{
- iotable_init(v2m_io_desc, ARRAY_SIZE(v2m_io_desc));
- iotable_init(tile, num);
-}
-
-void __init v2m_init_early(void)
-{
+ ct_desc->init_early();
versatile_sched_clock_init(MMIO_P2V(V2M_SYS_24MHZ), 24000000);
}
@@ -71,7 +69,7 @@
sp804_clockevents_init(MMIO_P2V(V2M_TIMER0), IRQ_V2M_TIMER0);
}
-struct sys_timer v2m_timer = {
+static struct sys_timer v2m_timer = {
.init = v2m_timer_init,
};
@@ -380,7 +378,44 @@
printk(KERN_EMERG "Unable to reboot\n");
}
-static int __init v2m_init(void)
+struct ct_desc *ct_desc;
+
+static struct ct_desc *ct_descs[] __initdata = {
+#ifdef CONFIG_ARCH_VEXPRESS_CA9X4
+ &ct_ca9x4_desc,
+#endif
+};
+
+static void __init v2m_populate_ct_desc(void)
+{
+ int i;
+ u32 current_tile_id;
+
+ ct_desc = NULL;
+ current_tile_id = readl(MMIO_P2V(V2M_SYS_PROCID0)) & V2M_CT_ID_MASK;
+
+ for (i = 0; i < ARRAY_SIZE(ct_descs) && !ct_desc; ++i)
+ if (ct_descs[i]->id == current_tile_id)
+ ct_desc = ct_descs[i];
+
+ if (!ct_desc)
+ panic("vexpress: failed to populate core tile description "
+ "for tile ID 0x%8x\n", current_tile_id);
+}
+
+static void __init v2m_map_io(void)
+{
+ iotable_init(v2m_io_desc, ARRAY_SIZE(v2m_io_desc));
+ v2m_populate_ct_desc();
+ ct_desc->map_io();
+}
+
+static void __init v2m_init_irq(void)
+{
+ ct_desc->init_irq();
+}
+
+static void __init v2m_init(void)
{
int i;
@@ -399,6 +434,14 @@
pm_power_off = v2m_power_off;
arm_pm_restart = v2m_restart;
- return 0;
+ ct_desc->init_tile();
}
-arch_initcall(v2m_init);
+
+MACHINE_START(VEXPRESS, "ARM-Versatile Express")
+ .boot_params = PLAT_PHYS_OFFSET + 0x00000100,
+ .map_io = v2m_map_io,
+ .init_early = v2m_init_early,
+ .init_irq = v2m_init_irq,
+ .timer = &v2m_timer,
+ .init_machine = v2m_init,
+MACHINE_END