From patchwork Thu Jul 19 13:26:24 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tero Kristo X-Patchwork-Id: 1216691 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id BEB553FD48 for ; Thu, 19 Jul 2012 13:27:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751479Ab2GSN1N (ORCPT ); Thu, 19 Jul 2012 09:27:13 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:58892 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750991Ab2GSN1L (ORCPT ); Thu, 19 Jul 2012 09:27:11 -0400 Received: from dlelxv30.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id q6JDQuN4026160; Thu, 19 Jul 2012 08:26:56 -0500 Received: from DFLE70.ent.ti.com (dfle70.ent.ti.com [128.247.5.40]) by dlelxv30.itg.ti.com (8.13.8/8.13.8) with ESMTP id q6JDQuhC011784; Thu, 19 Jul 2012 08:26:56 -0500 Received: from dlelxv22.itg.ti.com (172.17.1.197) by dfle70.ent.ti.com (128.247.5.40) with Microsoft SMTP Server id 14.1.323.3; Thu, 19 Jul 2012 08:26:56 -0500 Received: from localhost.localdomain (h64-4.vpn.ti.com [172.24.64.4]) by dlelxv22.itg.ti.com (8.13.8/8.13.8) with ESMTP id q6JDQliK019992; Thu, 19 Jul 2012 08:26:54 -0500 From: Tero Kristo To: , , , , CC: Subject: [PATCHv7 04/12] ARM: OMAP: hwmod: Add support for per hwmod/module context lost count Date: Thu, 19 Jul 2012 16:26:24 +0300 Message-ID: <1342704392-23657-5-git-send-email-t-kristo@ti.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1342704392-23657-1-git-send-email-t-kristo@ti.com> References: <1342704392-23657-1-git-send-email-t-kristo@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Rajendra Nayak OMAP4 has module specific context lost registers which makes it now possible to have module level context loss count, instead of relying on the powerdomain level context count. Add 2 private hwmod api's to update/clear the hwmod/module specific context lost counters/register. Update the module specific context_lost_counter and clear the hardware bits just after enabling the module. omap_hwmod_get_context_loss_count() now returns the hwmod context loss count them on platforms where they exist (OMAP4), else fall back on the pwrdm level counters for older platforms. Signed-off-by: Rajendra Nayak [paul@pwsan.com: added function kerneldoc, fixed structure kerneldoc, rearranged structure to avoid memory waste, marked fns as OMAP4-specific, prevent fn entry on non-OMAP4 chips, reduced indentation, merged update and clear, merged patches] Signed-off-by: Paul Walmsley [t-kristo@ti.com: added support for arch specific hwmod ops, and changed the no context offset indicator to USHRT_MAX] Signed-off-by: Tero Kristo --- arch/arm/mach-omap2/omap_hwmod.c | 71 ++++++++++++++++++++++++-- arch/arm/plat-omap/include/plat/omap_hwmod.h | 8 ++- 2 files changed, 73 insertions(+), 6 deletions(-) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 936da32..a60dfd2 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -170,6 +170,13 @@ /* omap_hwmod_list contains all registered struct omap_hwmods */ static LIST_HEAD(omap_hwmod_list); +struct hwmod_ops { + void (*hwmod_update_context_lost)(struct omap_hwmod *oh); + int (*hwmod_get_context_lost)(struct omap_hwmod *oh); +}; + +static struct hwmod_ops *arch_hwmod; + /* mpu_oh: used to add/remove MPU initiator from sleepdep list */ static struct omap_hwmod *mpu_oh; @@ -1784,6 +1791,52 @@ static void _reconfigure_io_chain(void) } /** + * _omap4_update_context_lost - increment hwmod context loss counter if + * hwmod context was lost, and clear hardware context loss reg + * @oh: hwmod to check for context loss + * + * If the PRCM indicates that the hwmod @oh lost context, increment + * our in-memory context loss counter, and clear the RM_*_CONTEXT + * bits. No return value. + */ +static void _omap4_update_context_lost(struct omap_hwmod *oh) +{ + u32 r; + + if (oh->prcm.omap4.context_offs == USHRT_MAX) + return; + + r = omap4_prminst_read_inst_reg(oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.context_offs); + + if (!r) + return; + + oh->prcm.omap4.context_lost_counter++; + + omap4_prminst_write_inst_reg(r, oh->clkdm->pwrdm.ptr->prcm_partition, + oh->clkdm->pwrdm.ptr->prcm_offs, + oh->prcm.omap4.context_offs); +} + +/** + * _omap4_get_context_lost - get context loss counter for a hwmod + * @oh: hwmod to get context loss counter for + * + * Returns the in-memory context loss counter for a hwmod. + */ +static int _omap4_get_context_lost(struct omap_hwmod *oh) +{ + return oh->prcm.omap4.context_lost_counter; +} + +static struct hwmod_ops omap4_hwmod_ops = { + .hwmod_update_context_lost = _omap4_update_context_lost, + .hwmod_get_context_lost = _omap4_get_context_lost, +}; + +/** * _enable - enable an omap_hwmod * @oh: struct omap_hwmod * * @@ -1864,6 +1917,9 @@ static int _enable(struct omap_hwmod *oh) _enable_clocks(oh); _enable_module(oh); + if (arch_hwmod && arch_hwmod->hwmod_update_context_lost) + arch_hwmod->hwmod_update_context_lost(oh); + r = _wait_target_ready(oh); if (!r) { /* @@ -2700,6 +2756,9 @@ int __init omap_hwmod_setup_one(const char *oh_name) */ static int __init omap_hwmod_setup_all(void) { + if (cpu_is_omap44xx()) + arch_hwmod = &omap4_hwmod_ops; + _ensure_mpu_hwmod_is_setup(NULL); omap_hwmod_for_each(_init, NULL); @@ -3353,17 +3412,21 @@ ohsps_unlock: * omap_hwmod_get_context_loss_count - get lost context count * @oh: struct omap_hwmod * * - * Query the powerdomain of of @oh to get the context loss - * count for this device. + * Returns the context loss count of associated @oh + * upon success, or zero if no context loss data is available. * - * Returns the context loss count of the powerdomain assocated with @oh - * upon success, or zero if no powerdomain exists for @oh. + * On OMAP4, this queries the per-hwmod context loss register, + * assuming one exists. If not, or on OMAP2/3, this queries the + * enclosing powerdomain context loss count. */ int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh) { struct powerdomain *pwrdm; int ret = 0; + if (arch_hwmod && arch_hwmod->hwmod_get_context_lost) + return arch_hwmod->hwmod_get_context_lost(oh); + pwrdm = omap_hwmod_get_pwrdm(oh); if (pwrdm) ret = pwrdm_get_context_loss_count(pwrdm); diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h index c835b71..75d59f5 100644 --- a/arch/arm/plat-omap/include/plat/omap_hwmod.h +++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h @@ -372,9 +372,12 @@ struct omap_hwmod_omap2_prcm { /** * struct omap_hwmod_omap4_prcm - OMAP4-specific PRCM data - * @clkctrl_reg: PRCM address of the clock control register - * @rstctrl_reg: address of the XXX_RSTCTRL register located in the PRM + * @clkctrl_offs: offset of the PRCM clock control register + * @rstctrl_offs: offset of the XXX_RSTCTRL register located in the PRM + * @context_offs: offset of the RM_*_CONTEXT register * @submodule_wkdep_bit: bit shift of the WKDEP range + * @modulemode: allowable modulemodes + * @context_lost_counter: Count of module level context lost */ struct omap_hwmod_omap4_prcm { u16 clkctrl_offs; @@ -382,6 +385,7 @@ struct omap_hwmod_omap4_prcm { u16 context_offs; u8 submodule_wkdep_bit; u8 modulemode; + unsigned context_lost_counter; };