bus: mvebu: pass the coherency availability information at init time

Until now, the mvebu-mbus was guessing by itself whether hardware I/O
coherency was available or not by poking into the Device Tree to see
if the coherency fabric Device Tree node was present or not.

However, on some upcoming SoCs, the presence or absence of the
coherency fabric DT node isn't sufficient: in CONFIG_SMP, the
coherency can be enabled, but not in !CONFIG_SMP.

In order to clean this up, the mvebu_mbus_dt_init() function is
extended to get a boolean argument telling whether coherency is
enabled or not. Therefore, the logic to decide whether coherency is
available or not now belongs to the core SoC code instead of the
mvebu-mbus driver itself, which is much better.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483228-25625-4-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

6 files changed, 8 insertions, 13 deletions

diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 2801da49e2a3..ff18ff20f71f 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -195,7 +195,7 @@ static void __init kirkwood_dt_init(void)
 {
 	kirkwood_disable_mbus_error_propagation();
 
-	BUG_ON(mvebu_mbus_dt_init());
+	BUG_ON(mvebu_mbus_dt_init(false));
 
 #ifdef CONFIG_CACHE_FEROCEON_L2
 	feroceon_of_init();
diff --git a/arch/arm/mach-mvebu/board-v7.c b/arch/arm/mach-mvebu/board-v7.c
index 333fca8fdc41..1730e0cdb6f6 100644
--- a/arch/arm/mach-mvebu/board-v7.c
+++ b/arch/arm/mach-mvebu/board-v7.c
@@ -58,7 +58,7 @@ static void __init mvebu_timer_and_clk_init(void)
 	of_clk_init(NULL);
 	clocksource_of_init();
 	coherency_init();
-	BUG_ON(mvebu_mbus_dt_init());
+	BUG_ON(mvebu_mbus_dt_init(coherency_available()));
 #ifdef CONFIG_CACHE_L2X0
 	l2x0_of_init(0, ~0UL);
 #endif
diff --git a/arch/arm/mach-mvebu/dove.c b/arch/arm/mach-mvebu/dove.c
index 5e5a43624237..b50464ec1130 100644
--- a/arch/arm/mach-mvebu/dove.c
+++ b/arch/arm/mach-mvebu/dove.c
@@ -23,7 +23,7 @@ static void __init dove_init(void)
 #ifdef CONFIG_CACHE_TAUROS2
 	tauros2_init(0);
 #endif
-	BUG_ON(mvebu_mbus_dt_init());
+	BUG_ON(mvebu_mbus_dt_init(false));
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }
 
diff --git a/arch/arm/mach-mvebu/kirkwood.c b/arch/arm/mach-mvebu/kirkwood.c
index 120207fc36f1..a77e0bae9c55 100644
--- a/arch/arm/mach-mvebu/kirkwood.c
+++ b/arch/arm/mach-mvebu/kirkwood.c
@@ -169,7 +169,7 @@ static void __init kirkwood_dt_init(void)
 {
 	kirkwood_disable_mbus_error_propagation();
 
-	BUG_ON(mvebu_mbus_dt_init());
+	BUG_ON(mvebu_mbus_dt_init(false));
 
 #ifdef CONFIG_CACHE_FEROCEON_L2
 	feroceon_of_init();
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 293e2e0a0a87..ff02fc90fc21 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -694,7 +694,6 @@ static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 					 phys_addr_t sdramwins_phys_base,
 					 size_t sdramwins_size)
 {
-	struct device_node *np;
 	int win;
 
 	mbus->mbuswins_base = ioremap(mbuswins_phys_base, mbuswins_size);
@@ -707,12 +706,6 @@ static int __init mvebu_mbus_common_init(struct mvebu_mbus_state *mbus,
 		return -ENOMEM;
 	}
 
-	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
-	if (np) {
-		mbus->hw_io_coherency = 1;
-		of_node_put(np);
-	}
-
 	for (win = 0; win < mbus->soc->num_wins; win++)
 		mvebu_mbus_disable_window(mbus, win);
 
@@ -882,7 +875,7 @@ static void __init mvebu_mbus_get_pcie_resources(struct device_node *np,
 	}
 }
 
-int __init mvebu_mbus_dt_init(void)
+int __init mvebu_mbus_dt_init(bool is_coherent)
 {
 	struct resource mbuswins_res, sdramwins_res;
 	struct device_node *np, *controller;
@@ -920,6 +913,8 @@ int __init mvebu_mbus_dt_init(void)
 		return -EINVAL;
 	}
 
+	mbus_state.hw_io_coherency = is_coherent;
+
 	/* Get optional pcie-{mem,io}-aperture properties */
 	mvebu_mbus_get_pcie_resources(np, &mbus_state.pcie_mem_aperture,
 					  &mbus_state.pcie_io_aperture);
diff --git a/include/linux/mbus.h b/include/linux/mbus.h
index 345b8c53b897..550c88fb0267 100644
--- a/include/linux/mbus.h
+++ b/include/linux/mbus.h
@@ -73,6 +73,6 @@ int mvebu_mbus_del_window(phys_addr_t base, size_t size);
 int mvebu_mbus_init(const char *soc, phys_addr_t mbus_phys_base,
 		    size_t mbus_size, phys_addr_t sdram_phys_base,
 		    size_t sdram_size);
-int mvebu_mbus_dt_init(void);
+int mvebu_mbus_dt_init(bool is_coherent);
 
 #endif /* __LINUX_MBUS_H */