aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/powerdomain.c
diff options
context:
space:
mode:
authorPaul Walmsley <paul@pwsan.com>2008-06-25 20:09:37 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-08-21 16:26:39 -0400
commit0b7cbfb5e1f03f58241bf236cca303ee45e14b4f (patch)
treee5507290b827ee4fa60cf7a7a7f3f473d2c1a453 /arch/arm/mach-omap2/powerdomain.c
parent5955902fb5c31f6a784ddb7aa16079a2bec588f5 (diff)
[ARM] OMAP3 pwrdm: add hardware save-and-restore (SAR) support
OMAP3430ES2+ introduces a new feature: optional powerdomain context hardware save-and-restore (SAR). Currently, this feature only applies to USBHOST and USBTLL module context when the USBHOST or CORE powerdomains enter a low-power sleep state[1]. This feature avoids re-enumeration of USB devices when the powerdomains return from idle, which is potentially time-consuming. This patch adds support for enabling and disabling hardware save-and-restore to the powerdomain code. Three new functions are added, pwrdm_enable_hdwr_sar(), pwrdm_disable_hdwr_sar(), and pwrdm_can_hdwr_sar(). A new struct powerdomain "flags" field is added, with a PWRDM_HAS_HDWR_SAR flag to indicate powerdomains with SAR support. Thanks to Jouni Högander <jouni.hogander@nokia.com> for reviewing an earlier version of these patches, and Richard Woodruff <r-woodruff2@ti.com> for clarifying the purpose of these bits. 1. For the USBHOST controller module, context loss occurs when the USBHOST powerdomain enters off-idle. For USBTLL, context loss occurs either if CORE enters off-idle, or if the CORE logic is configured to turn off when CORE enters retention-idle (OSWR). 34xx ES2 TRM 4.8.6.1.1, 4.8.6.1.2 Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-omap2/powerdomain.c')
-rw-r--r--arch/arm/mach-omap2/powerdomain.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 9a803492b28f..73e2971b1757 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -1003,6 +1003,74 @@ int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
1003} 1003}
1004 1004
1005/** 1005/**
1006 * pwrdm_enable_hdwr_sar - enable automatic hardware SAR for a pwrdm
1007 * @pwrdm: struct powerdomain *
1008 *
1009 * Enable automatic context save-and-restore upon power state change
1010 * for some devices in a powerdomain. Warning: this only affects a
1011 * subset of devices in a powerdomain; check the TRM closely. Returns
1012 * -EINVAL if the powerdomain pointer is null or if the powerdomain
1013 * does not support automatic save-and-restore, or returns 0 upon
1014 * success.
1015 */
1016int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm)
1017{
1018 if (!pwrdm)
1019 return -EINVAL;
1020
1021 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1022 return -EINVAL;
1023
1024 pr_debug("powerdomain: %s: setting SAVEANDRESTORE bit\n",
1025 pwrdm->name);
1026
1027 prm_rmw_mod_reg_bits(0, 1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT,
1028 pwrdm->prcm_offs, PM_PWSTCTRL);
1029
1030 return 0;
1031}
1032
1033/**
1034 * pwrdm_disable_hdwr_sar - disable automatic hardware SAR for a pwrdm
1035 * @pwrdm: struct powerdomain *
1036 *
1037 * Disable automatic context save-and-restore upon power state change
1038 * for some devices in a powerdomain. Warning: this only affects a
1039 * subset of devices in a powerdomain; check the TRM closely. Returns
1040 * -EINVAL if the powerdomain pointer is null or if the powerdomain
1041 * does not support automatic save-and-restore, or returns 0 upon
1042 * success.
1043 */
1044int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm)
1045{
1046 if (!pwrdm)
1047 return -EINVAL;
1048
1049 if (!(pwrdm->flags & PWRDM_HAS_HDWR_SAR))
1050 return -EINVAL;
1051
1052 pr_debug("powerdomain: %s: clearing SAVEANDRESTORE bit\n",
1053 pwrdm->name);
1054
1055 prm_rmw_mod_reg_bits(1 << OMAP3430ES2_SAVEANDRESTORE_SHIFT, 0,
1056 pwrdm->prcm_offs, PM_PWSTCTRL);
1057
1058 return 0;
1059}
1060
1061/**
1062 * pwrdm_has_hdwr_sar - test whether powerdomain supports hardware SAR
1063 * @pwrdm: struct powerdomain *
1064 *
1065 * Returns 1 if powerdomain 'pwrdm' supports hardware save-and-restore
1066 * for some devices, or 0 if it does not.
1067 */
1068bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
1069{
1070 return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
1071}
1072
1073/**
1006 * pwrdm_wait_transition - wait for powerdomain power transition to finish 1074 * pwrdm_wait_transition - wait for powerdomain power transition to finish
1007 * @pwrdm: struct powerdomain * to wait for 1075 * @pwrdm: struct powerdomain * to wait for
1008 * 1076 *