summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-tegra
diff options
context:
space:
mode:
authorThierry Reding <treding@nvidia.com>2014-08-26 08:14:04 +0200
committerStephen Warren <swarren@nvidia.com>2014-08-26 11:43:55 -0600
commit783944feaab8383495ba067276a16e28c205fb13 (patch)
tree3eff8e54489cc4b0a7babe3d8bdd1440ca85f07a /arch/arm/mach-tegra
parent9fc3bf5dc2cf3c8703601ad9a612b2f9eefb8a22 (diff)
downloadop-kernel-dev-783944feaab8383495ba067276a16e28c205fb13.zip
op-kernel-dev-783944feaab8383495ba067276a16e28c205fb13.tar.gz
ARM: tegra: Initialize flow controller from DT
Use a matching device tree node to initialize the flow controller driver instead of hard-coding the I/O address. This is necessary to get rid of the iomap.h include, which in turn make it easier to share this code with 64-bit Tegra SoCs. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
-rw-r--r--arch/arm/mach-tegra/flowctrl.c44
-rw-r--r--arch/arm/mach-tegra/flowctrl.h2
-rw-r--r--arch/arm/mach-tegra/tegra.c2
3 files changed, 41 insertions, 7 deletions
diff --git a/arch/arm/mach-tegra/flowctrl.c b/arch/arm/mach-tegra/flowctrl.c
index ec55d1d..475e783 100644
--- a/arch/arm/mach-tegra/flowctrl.c
+++ b/arch/arm/mach-tegra/flowctrl.c
@@ -22,11 +22,12 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
#include <soc/tegra/fuse.h>
#include "flowctrl.h"
-#include "iomap.h"
static u8 flowctrl_offset_halt_cpu[] = {
FLOW_CTRL_HALT_CPU0_EVENTS,
@@ -42,23 +43,22 @@ static u8 flowctrl_offset_cpu_csr[] = {
FLOW_CTRL_CPU1_CSR + 16,
};
+static void __iomem *tegra_flowctrl_base;
+
static void flowctrl_update(u8 offset, u32 value)
{
- void __iomem *addr = IO_ADDRESS(TEGRA_FLOW_CTRL_BASE) + offset;
-
- writel(value, addr);
+ writel(value, tegra_flowctrl_base + offset);
/* ensure the update has reached the flow controller */
wmb();
- readl_relaxed(addr);
+ readl_relaxed(tegra_flowctrl_base + offset);
}
u32 flowctrl_read_cpu_csr(unsigned int cpuid)
{
u8 offset = flowctrl_offset_cpu_csr[cpuid];
- void __iomem *addr = IO_ADDRESS(TEGRA_FLOW_CTRL_BASE) + offset;
- return readl(addr);
+ return readl(tegra_flowctrl_base + offset);
}
void flowctrl_write_cpu_csr(unsigned int cpuid, u32 value)
@@ -139,3 +139,33 @@ void flowctrl_cpu_suspend_exit(unsigned int cpuid)
reg |= FLOW_CTRL_CSR_EVENT_FLAG; /* clear event */
flowctrl_write_cpu_csr(cpuid, reg);
}
+
+static const struct of_device_id matches[] __initconst = {
+ { .compatible = "nvidia,tegra124-flowctrl" },
+ { .compatible = "nvidia,tegra114-flowctrl" },
+ { .compatible = "nvidia,tegra30-flowctrl" },
+ { .compatible = "nvidia,tegra20-flowctrl" },
+ { }
+};
+
+void __init tegra_flowctrl_init(void)
+{
+ /* hardcoded fallback if device tree node is missing */
+ unsigned long base = 0x60007000;
+ unsigned long size = SZ_4K;
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, matches);
+ if (np) {
+ struct resource res;
+
+ if (of_address_to_resource(np, 0, &res) == 0) {
+ size = resource_size(&res);
+ base = res.start;
+ }
+
+ of_node_put(np);
+ }
+
+ tegra_flowctrl_base = ioremap_nocache(base, size);
+}
diff --git a/arch/arm/mach-tegra/flowctrl.h b/arch/arm/mach-tegra/flowctrl.h
index c89aac6..73a9c50 100644
--- a/arch/arm/mach-tegra/flowctrl.h
+++ b/arch/arm/mach-tegra/flowctrl.h
@@ -59,6 +59,8 @@ void flowctrl_write_cpu_halt(unsigned int cpuid, u32 value);
void flowctrl_cpu_suspend_enter(unsigned int cpuid);
void flowctrl_cpu_suspend_exit(unsigned int cpuid);
+
+void tegra_flowctrl_init(void);
#endif
#endif
diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c
index 5ef5173..ef016af 100644
--- a/arch/arm/mach-tegra/tegra.c
+++ b/arch/arm/mach-tegra/tegra.c
@@ -48,6 +48,7 @@
#include "board.h"
#include "common.h"
#include "cpuidle.h"
+#include "flowctrl.h"
#include "iomap.h"
#include "irq.h"
#include "pm.h"
@@ -74,6 +75,7 @@ static void __init tegra_init_early(void)
{
of_register_trusted_foundations();
tegra_cpu_reset_handler_init();
+ tegra_flowctrl_init();
}
static void __init tegra_dt_init_irq(void)
OpenPOWER on IntegriCloud