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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/mach-imx/pm-imx27.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/mach-imx/pm-imx27.c')
-rw-r--r--arch/arm/mach-imx/pm-imx27.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/pm-imx27.c b/arch/arm/mach-imx/pm-imx27.c
new file mode 100644
index 0000000000..237e8aa9fe
--- /dev/null
+++ b/arch/arm/mach-imx/pm-imx27.c
@@ -0,0 +1,52 @@
+/*
+ * i.MX27 Power Management Routines
+ *
+ * Based on Freescale's BSP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License.
+ */
+
+#include <linux/of_address.h>
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/io.h>
+
+#include "common.h"
+#include "hardware.h"
+
+static int mx27_suspend_enter(suspend_state_t state)
+{
+ void __iomem *ccm_base;
+ struct device_node *np;
+ u32 cscr;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
+ ccm_base = of_iomap(np, 0);
+ BUG_ON(!ccm_base);
+
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ /* Clear MPEN and SPEN to disable MPLL/SPLL */
+ cscr = imx_readl(ccm_base);
+ cscr &= 0xFFFFFFFC;
+ imx_writel(cscr, ccm_base);
+ /* Executes WFI */
+ cpu_do_idle();
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static const struct platform_suspend_ops mx27_suspend_ops = {
+ .enter = mx27_suspend_enter,
+ .valid = suspend_valid_only_mem,
+};
+
+void __init imx27_pm_init(void)
+{
+ suspend_set_ops(&mx27_suspend_ops);
+}