diff options
author | Mark Kettenis <kettenis@openbsd.org> | 2022-01-22 22:38:17 +0300 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2022-02-11 00:44:23 +0300 |
commit | 81fafbbeba3211ed60ac8aff41a2e1fcb9a40431 (patch) | |
tree | 1d1d044ec2f31c1a6d34660a0d2e6c9a392c31dc /drivers/power | |
parent | ca99a17e02ab4f99b1455be349858d5a7aa7553c (diff) | |
download | u-boot-81fafbbeba3211ed60ac8aff41a2e1fcb9a40431.tar.xz |
power: domain: apple: Add reset support
The power management controller found on Apple SoCs als provides
a way to reset all devices within a power domain. This is needed
to cleanly shutdown the NVMe controller before we hand over
control to the OS.
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested on: Macbook Air M1
Tested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Diffstat (limited to 'drivers/power')
-rw-r--r-- | drivers/power/domain/apple-pmgr.c | 73 |
1 files changed, 72 insertions, 1 deletions
diff --git a/drivers/power/domain/apple-pmgr.c b/drivers/power/domain/apple-pmgr.c index d25f136b9d..4d06e76ff5 100644 --- a/drivers/power/domain/apple-pmgr.c +++ b/drivers/power/domain/apple-pmgr.c @@ -6,14 +6,22 @@ #include <common.h> #include <asm/io.h> #include <dm.h> +#include <dm/device-internal.h> #include <linux/err.h> #include <linux/bitfield.h> #include <power-domain-uclass.h> +#include <reset-uclass.h> #include <regmap.h> #include <syscon.h> -#define APPLE_PMGR_PS_TARGET GENMASK(3, 0) +#define APPLE_PMGR_RESET BIT(31) +#define APPLE_PMGR_DEV_DISABLE BIT(10) +#define APPLE_PMGR_WAS_CLKGATED BIT(9) +#define APPLE_PMGR_WAS_PWRGATED BIT(8) #define APPLE_PMGR_PS_ACTUAL GENMASK(7, 4) +#define APPLE_PMGR_PS_TARGET GENMASK(3, 0) + +#define APPLE_PMGR_FLAGS (APPLE_PMGR_WAS_CLKGATED | APPLE_PMGR_WAS_PWRGATED) #define APPLE_PMGR_PS_ACTIVE 0xf #define APPLE_PMGR_PS_PWRGATE 0x0 @@ -25,6 +33,65 @@ struct apple_pmgr_priv { u32 offset; /* offset within regmap for this domain */ }; +static int apple_reset_of_xlate(struct reset_ctl *reset_ctl, + struct ofnode_phandle_args *args) +{ + if (args->args_count != 0) + return -EINVAL; + + return 0; +} + +static int apple_reset_request(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int apple_reset_free(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int apple_reset_assert(struct reset_ctl *reset_ctl) +{ + struct apple_pmgr_priv *priv = dev_get_priv(reset_ctl->dev->parent); + + regmap_update_bits(priv->regmap, priv->offset, + APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, + APPLE_PMGR_DEV_DISABLE); + regmap_update_bits(priv->regmap, priv->offset, + APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, + APPLE_PMGR_RESET); + + return 0; +} + +static int apple_reset_deassert(struct reset_ctl *reset_ctl) +{ + struct apple_pmgr_priv *priv = dev_get_priv(reset_ctl->dev->parent); + + regmap_update_bits(priv->regmap, priv->offset, + APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, 0); + regmap_update_bits(priv->regmap, priv->offset, + APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, 0); + + return 0; +} + +struct reset_ops apple_reset_ops = { + .of_xlate = apple_reset_of_xlate, + .request = apple_reset_request, + .rfree = apple_reset_free, + .rst_assert = apple_reset_assert, + .rst_deassert = apple_reset_deassert, +}; + +static struct driver apple_reset_driver = { + .name = "apple_reset", + .id = UCLASS_RESET, + .ops = &apple_reset_ops, +}; + static int apple_pmgr_request(struct power_domain *power_domain) { return 0; @@ -78,6 +145,7 @@ static const struct udevice_id apple_pmgr_ids[] = { static int apple_pmgr_probe(struct udevice *dev) { struct apple_pmgr_priv *priv = dev_get_priv(dev); + struct udevice *child; int ret; ret = dev_power_domain_on(dev); @@ -92,6 +160,9 @@ static int apple_pmgr_probe(struct udevice *dev) if (ret < 0) return ret; + device_bind(dev, &apple_reset_driver, "apple_reset", NULL, + dev_ofnode(dev), &child); + return 0; } |