From patchwork Tue May 28 23:08:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 1106620 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=nvidia.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.b="aZrcrlN+"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45D8gw6mWSz9sB8 for ; Wed, 29 May 2019 09:10:04 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726831AbfE1XJ7 (ORCPT ); Tue, 28 May 2019 19:09:59 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:16496 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727147AbfE1XJB (ORCPT ); Tue, 28 May 2019 19:09:01 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 28 May 2019 16:09:00 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 28 May 2019 16:09:00 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 28 May 2019 16:09:00 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 28 May 2019 23:08:59 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 28 May 2019 23:08:59 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.110.103.86]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Tue, 28 May 2019 16:08:59 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH V2 04/12] clk: tegra: add support for peripheral clock suspend and resume Date: Tue, 28 May 2019 16:08:48 -0700 Message-ID: <1559084936-4610-5-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559084936-4610-1-git-send-email-skomatineni@nvidia.com> References: <1559084936-4610-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1559084940; bh=xFOmjeaoCNKZGSYsRBa0HN3DzU4TBaJQr2OcS9aU+yo=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=aZrcrlN+dCGQehBr2IcQ67Mf1RMkZXisnfCh06ISK0M4+16+MRCACtn9mUX47zRAp CmHdnHWCbB4BXerkBFhbUWjpeJFX/fW8YzxB4GBo12iDTuk4L/kGZe9iVA5nb5OpFm oibUJrKPUVGy+ZDLE0MJ1PUpBpUqQgr3FNLLuoYVjg4EfN1UjpxcAlU1GZdC9T4OT4 V4E8l4TfR9DxWayZn1Jx5N6LZoDVKIhi5Ph0vwniu/FRHvNGhfvU9GZ33CiiCui8Yp Y9yk8v9ZRnoltl/Mpc7SLI/Hot4tJXzh+P+4vnifp750SIk7Q4nL9FL5F3Jocah/yy Lg9ggsrzx4OWQ== Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements peripheral clock context save and restore to support system suspend and resume operation. Signed-off-by: Sowjanya Komatineni --- drivers/clk/tegra/clk.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++- drivers/clk/tegra/clk.h | 3 ++ 2 files changed, 76 insertions(+), 1 deletion(-) diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c index 6f2862eddad7..08b788766564 100644 --- a/drivers/clk/tegra/clk.c +++ b/drivers/clk/tegra/clk.c @@ -81,6 +81,10 @@ static struct clk **clks; static int clk_num; static struct clk_onecell_data clk_data; +#ifdef CONFIG_PM_SLEEP +static u32 *periph_ctx; +#endif + /* Handlers for SoC-specific reset lines */ static int (*special_reset_assert)(unsigned long); static int (*special_reset_deassert)(unsigned long); @@ -210,6 +214,65 @@ const struct tegra_clk_periph_regs *get_reg_bank(int clkid) } } +#ifdef CONFIG_PM_SLEEP +void tegra_clk_periph_suspend(void __iomem *clk_base) +{ + int i, idx; + + idx = 0; + for (i = 0; i < periph_banks; i++, idx++) + periph_ctx[idx] = + readl_relaxed(clk_base + periph_regs[i].rst_reg); + + for (i = 0; i < periph_banks; i++, idx++) + periph_ctx[idx] = + readl_relaxed(clk_base + periph_regs[i].enb_reg); +} + +void tegra_clk_periph_force_on(u32 *clks_on, int count, void __iomem *clk_base) +{ + int i; + + WARN_ON(count != periph_banks); + + for (i = 0; i < count; i++) + writel_relaxed(clks_on[i], clk_base + periph_regs[i].enb_reg); +} + +void tegra_clk_periph_resume(void __iomem *clk_base) +{ + int i, idx; + + idx = 0; + for (i = 0; i < periph_banks; i++, idx++) + writel_relaxed(periph_ctx[idx], + clk_base + periph_regs[i].rst_reg); + + /* ensure all resets have propagated */ + fence_udelay(2, clk_base); + tegra_read_chipid(); + + for (i = 0; i < periph_banks; i++, idx++) + writel_relaxed(periph_ctx[idx], + clk_base + periph_regs[i].enb_reg); + + /* ensure all enables have propagated */ + fence_udelay(2, clk_base); + tegra_read_chipid(); +} + +static int tegra_clk_suspend_ctx_init(int banks) +{ + int err = 0; + + periph_ctx = kzalloc(2 * banks * sizeof(*periph_ctx), GFP_KERNEL); + if (!periph_ctx) + err = -ENOMEM; + + return err; +} +#endif + struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks) { clk_base = regs; @@ -226,11 +289,20 @@ struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks) periph_banks = banks; clks = kcalloc(num, sizeof(struct clk *), GFP_KERNEL); - if (!clks) + if (!clks) { kfree(periph_clk_enb_refcnt); + return NULL; + } clk_num = num; +#ifdef CONFIG_PM_SLEEP + if (tegra_clk_suspend_ctx_init(banks)) { + kfree(periph_clk_enb_refcnt); + kfree(clks); + return NULL; + } +#endif return clks; } diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index e4d124cc5657..ab238b2c3125 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -848,6 +848,9 @@ void tegra_clk_pll_out_resume(struct clk *clk, unsigned long rate); void tegra_clk_plle_tegra210_resume(struct clk *c); void tegra_clk_sync_state_pll(struct clk *c); void tegra_clk_sync_state_pll_out(struct clk *clk); +void tegra_clk_periph_suspend(void __iomem *clk_base); +void tegra_clk_periph_resume(void __iomem *clk_base); +void tegra_clk_periph_force_on(u32 *clks_on, int count, void __iomem *clk_base); #endif