v4.19.13 snapshot.
diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c
new file mode 100644
index 0000000..495d85d
--- /dev/null
+++ b/arch/arm/mach-imx/src.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * Copyright 2011 Linaro Ltd.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/init.h>
+#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 const 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)
+{
+ u32 mask, val;
+
+ 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;
+ val |= 1 << (BP_SRC_SCR_CORE1_RST + cpu - 1);
+ writel_relaxed(val, src_base + SRC_SCR);
+ spin_unlock(&scr_lock);
+}
+
+void imx_set_cpu_jump(int cpu, void *jump_addr)
+{
+ cpu = cpu_logical_map(cpu);
+ writel_relaxed(__pa_symbol(jump_addr),
+ src_base + SRC_GPR1 + cpu * 8);
+}
+
+u32 imx_get_cpu_arg(int cpu)
+{
+ cpu = cpu_logical_map(cpu);
+ return readl_relaxed(src_base + SRC_GPR1 + cpu * 8 + 4);
+}
+
+void imx_set_cpu_arg(int cpu, u32 arg)
+{
+ cpu = cpu_logical_map(cpu);
+ writel_relaxed(arg, src_base + SRC_GPR1 + cpu * 8 + 4);
+}
+
+void __init imx_src_init(void)
+{
+ struct device_node *np;
+ u32 val;
+
+ 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);
+}