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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/mach-imx/pm-imx27.c | |
parent | Initial commit. (diff) | |
download | linux-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.c | 52 |
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); +} |