aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-imx/src.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-imx/src.c')
-rw-r--r--arch/arm/mach-imx/src.c71
1 files changed, 70 insertions, 1 deletions
diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c
index 09a742f8c7a..10a6b1a8c5a 100644
--- a/arch/arm/mach-imx/src.c
+++ b/arch/arm/mach-imx/src.c
@@ -14,16 +14,73 @@
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/reset-controller.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
+#include "common.h"
#define SRC_SCR 0x000
#define SRC_GPR1 0x020
#define BP_SRC_SCR_WARM_RESET_ENABLE 0
+#define BP_SRC_SCR_SW_GPU_RST 1
+#define BP_SRC_SCR_SW_VPU_RST 2
+#define BP_SRC_SCR_SW_IPU1_RST 3
+#define BP_SRC_SCR_SW_OPEN_VG_RST 4
+#define BP_SRC_SCR_SW_IPU2_RST 12
#define BP_SRC_SCR_CORE1_RST 14
#define BP_SRC_SCR_CORE1_ENABLE 22
static void __iomem *src_base;
+static DEFINE_SPINLOCK(scr_lock);
+
+static const int sw_reset_bits[5] = {
+ BP_SRC_SCR_SW_GPU_RST,
+ BP_SRC_SCR_SW_VPU_RST,
+ BP_SRC_SCR_SW_IPU1_RST,
+ BP_SRC_SCR_SW_OPEN_VG_RST,
+ BP_SRC_SCR_SW_IPU2_RST
+};
+
+static int imx_src_reset_module(struct reset_controller_dev *rcdev,
+ unsigned long sw_reset_idx)
+{
+ unsigned long timeout;
+ unsigned long flags;
+ int bit;
+ u32 val;
+
+ if (!src_base)
+ return -ENODEV;
+
+ if (sw_reset_idx >= ARRAY_SIZE(sw_reset_bits))
+ return -EINVAL;
+
+ bit = 1 << sw_reset_bits[sw_reset_idx];
+
+ spin_lock_irqsave(&scr_lock, flags);
+ val = readl_relaxed(src_base + SRC_SCR);
+ val |= bit;
+ writel_relaxed(val, src_base + SRC_SCR);
+ spin_unlock_irqrestore(&scr_lock, flags);
+
+ timeout = jiffies + msecs_to_jiffies(1000);
+ while (readl(src_base + SRC_SCR) & bit) {
+ if (time_after(jiffies, timeout))
+ return -ETIME;
+ cpu_relax();
+ }
+
+ return 0;
+}
+
+static struct reset_control_ops imx_src_ops = {
+ .reset = imx_src_reset_module,
+};
+
+static struct reset_controller_dev imx_reset_controller = {
+ .ops = &imx_src_ops,
+ .nr_resets = ARRAY_SIZE(sw_reset_bits),
+};
void imx_enable_cpu(int cpu, bool enable)
{
@@ -31,9 +88,11 @@ void imx_enable_cpu(int cpu, bool enable)
cpu = cpu_logical_map(cpu);
mask = 1 << (BP_SRC_SCR_CORE1_ENABLE + cpu - 1);
+ spin_lock(&scr_lock);
val = readl_relaxed(src_base + SRC_SCR);
val = enable ? val | mask : val & ~mask;
writel_relaxed(val, src_base + SRC_SCR);
+ spin_unlock(&scr_lock);
}
void imx_set_cpu_jump(int cpu, void *jump_addr)
@@ -60,9 +119,11 @@ void imx_src_prepare_restart(void)
u32 val;
/* clear enable bits of secondary cores */
+ spin_lock(&scr_lock);
val = readl_relaxed(src_base + SRC_SCR);
val &= ~(0x7 << BP_SRC_SCR_CORE1_ENABLE);
writel_relaxed(val, src_base + SRC_SCR);
+ spin_unlock(&scr_lock);
/* clear persistent entry register of primary core */
writel_relaxed(0, src_base + SRC_GPR1);
@@ -73,15 +134,23 @@ void __init imx_src_init(void)
struct device_node *np;
u32 val;
- np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-src");
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx51-src");
+ if (!np)
+ return;
src_base = of_iomap(np, 0);
WARN_ON(!src_base);
+ imx_reset_controller.of_node = np;
+ if (IS_ENABLED(CONFIG_RESET_CONTROLLER))
+ reset_controller_register(&imx_reset_controller);
+
/*
* force warm reset sources to generate cold reset
* for a more reliable restart
*/
+ spin_lock(&scr_lock);
val = readl_relaxed(src_base + SRC_SCR);
val &= ~(1 << BP_SRC_SCR_WARM_RESET_ENABLE);
writel_relaxed(val, src_base + SRC_SCR);
+ spin_unlock(&scr_lock);
}