From patchwork Wed May 13 14:58:40 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikko Perttunen X-Patchwork-Id: 6397551 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EC22ABEEE5 for ; Wed, 13 May 2015 15:01:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5B88120411 for ; Wed, 13 May 2015 15:01:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C30C2042A for ; Wed, 13 May 2015 15:01:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965297AbbEMPBJ (ORCPT ); Wed, 13 May 2015 11:01:09 -0400 Received: from mail.kapsi.fi ([217.30.184.167]:36602 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965426AbbEMPBG (ORCPT ); Wed, 13 May 2015 11:01:06 -0400 Received: from [2001:708:30:12d0:beee:7bff:fe5b:f272] (helo=katsura.kyla.fi) by mail.kapsi.fi with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA256:128) (Exim 4.80) (envelope-from ) id 1YsY9D-0003Ig-BW; Wed, 13 May 2015 18:00:35 +0300 From: Mikko Perttunen To: swarren@wwwdotorg.org, thierry.reding@gmail.com, gnurou@gmail.com, pdeschrijver@nvidia.com, rjw@rjwysocki.net, viresh.kumar@linaro.org Cc: mturquette@linaro.org, pwalmsley@nvidia.com, vinceh@nvidia.com, pgaikwad@nvidia.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, tuomas.tynkkynen@iki.fi, Tuomas Tynkkynen , Mikko Perttunen Subject: [PATCH v9 06/17] clk: tegra: Add DFLL DVCO reset control for Tegra124 Date: Wed, 13 May 2015 17:58:40 +0300 Message-Id: <1431529131-16710-7-git-send-email-mikko.perttunen@kapsi.fi> X-Mailer: git-send-email 2.3.0 In-Reply-To: <1431529131-16710-1-git-send-email-mikko.perttunen@kapsi.fi> References: <1431529131-16710-1-git-send-email-mikko.perttunen@kapsi.fi> X-SA-Exim-Connect-IP: 2001:708:30:12d0:beee:7bff:fe5b:f272 X-SA-Exim-Mail-From: mikko.perttunen@kapsi.fi X-SA-Exim-Scanned: No (on mail.kapsi.fi); SAEximRunCond expanded to false Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Paul Walmsley The DVCO present in the DFLL IP block has a separate reset line, exposed via the CAR IP block. This reset line is asserted upon SoC reset. Unless something (such as the DFLL driver) deasserts this line, the DVCO will not oscillate, although reads and writes to the DFLL IP block will complete. Thanks to Aleksandr Frid for identifying this and saving hours of debugging time. Signed-off-by: Paul Walmsley [ttynkkynen: ported to tegra124 from tegra114] Signed-off-by: Tuomas Tynkkynen [mikko.perttunen: ported to special reset callback] Signed-off-by: Mikko Perttunen Acked-by: Michael Turquette --- drivers/clk/tegra/clk-tegra124.c | 68 ++++++++++++++++++++++++++++++++ include/dt-bindings/reset/tegra124-car.h | 11 ++++++ 2 files changed, 79 insertions(+) create mode 100644 include/dt-bindings/reset/tegra124-car.h diff --git a/drivers/clk/tegra/clk-tegra124.c b/drivers/clk/tegra/clk-tegra124.c index e8cca3e..42ba3d9 100644 --- a/drivers/clk/tegra/clk-tegra124.c +++ b/drivers/clk/tegra/clk-tegra124.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "clk.h" #include "clk-id.h" @@ -39,6 +40,9 @@ #define CLK_SOURCE_CSITE 0x1d4 #define CLK_SOURCE_EMC 0x19c +#define RST_DFLL_DVCO 0x2f4 +#define DVFS_DFLL_RESET_SHIFT 0 + #define PLLC_BASE 0x80 #define PLLC_OUT 0x84 #define PLLC_MISC2 0x88 @@ -1415,6 +1419,68 @@ static void __init tegra124_clock_apply_init_table(void) } /** + * tegra124_car_barrier - wait for pending writes to the CAR to complete + * + * Wait for any outstanding writes to the CAR MMIO space from this CPU + * to complete before continuing execution. No return value. + */ +static void tegra124_car_barrier(void) +{ + readl_relaxed(clk_base + RST_DFLL_DVCO); +} + +/** + * tegra124_clock_assert_dfll_dvco_reset - assert the DFLL's DVCO reset + * + * Assert the reset line of the DFLL's DVCO. No return value. + */ +void tegra124_clock_assert_dfll_dvco_reset(void) +{ + u32 v; + + v = readl_relaxed(clk_base + RST_DFLL_DVCO); + v |= (1 << DVFS_DFLL_RESET_SHIFT); + writel_relaxed(v, clk_base + RST_DFLL_DVCO); + tegra124_car_barrier(); +} + +/** + * tegra124_clock_deassert_dfll_dvco_reset - deassert the DFLL's DVCO reset + * + * Deassert the reset line of the DFLL's DVCO, allowing the DVCO to + * operate. No return value. + */ +void tegra124_clock_deassert_dfll_dvco_reset(void) +{ + u32 v; + + v = readl_relaxed(clk_base + RST_DFLL_DVCO); + v &= ~(1 << DVFS_DFLL_RESET_SHIFT); + writel_relaxed(v, clk_base + RST_DFLL_DVCO); + tegra124_car_barrier(); +} + +int tegra124_reset_assert(unsigned long id) +{ + if (id == TEGRA124_RST_DFLL_DVCO) + tegra124_clock_assert_dfll_dvco_reset(); + else + return -EINVAL; + + return 0; +} + +int tegra124_reset_deassert(unsigned long id) +{ + if (id == TEGRA124_RST_DFLL_DVCO) + tegra124_clock_deassert_dfll_dvco_reset(); + else + return -EINVAL; + + return 0; +} + +/** * tegra132_clock_apply_init_table - initialize clocks on Tegra132 SoCs * * Program an initial clock rate and enable or disable clocks needed @@ -1499,6 +1565,8 @@ static void __init tegra124_132_clock_init_post(struct device_node *np) { tegra_super_clk_gen4_init(clk_base, pmc_base, tegra124_clks, &pll_x_params); + tegra_init_special_resets(tegra124_reset_assert, + tegra124_reset_deassert); tegra_add_of_provider(np); clks[TEGRA124_CLK_EMC] = tegra_clk_register_emc(clk_base, np, diff --git a/include/dt-bindings/reset/tegra124-car.h b/include/dt-bindings/reset/tegra124-car.h new file mode 100644 index 0000000..1cc771f --- /dev/null +++ b/include/dt-bindings/reset/tegra124-car.h @@ -0,0 +1,11 @@ +/* + * This header provides Tegra124-specific constants for binding + * nvidia,tegra124-car. + */ + +#ifndef _DT_BINDINGS_RESET_TEGRA124_CAR_H +#define _DT_BINDINGS_RESET_TEGRA124_CAR_H + +#define TEGRA124_RST_DFLL_DVCO 0x40000000 + +#endif /* _DT_BINDINGS_RESET_TEGRA124_CAR_H */