From patchwork Thu Oct 18 05:07:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianxin Pan X-Patchwork-Id: 10646705 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 044B717D4 for ; Thu, 18 Oct 2018 05:07:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E668C2883D for ; Thu, 18 Oct 2018 05:07:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D591828866; Thu, 18 Oct 2018 05:07:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 01D382883D for ; Thu, 18 Oct 2018 05:07:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727492AbeJRNG4 (ORCPT ); Thu, 18 Oct 2018 09:06:56 -0400 Received: from mail-sh2.amlogic.com ([58.32.228.45]:28728 "EHLO mail-sh2.amlogic.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727464AbeJRNGy (ORCPT ); Thu, 18 Oct 2018 09:06:54 -0400 Received: from localhost.localdomain (10.18.11.217) by mail-sh2.amlogic.com (10.18.11.6) with Microsoft SMTP Server id 15.0.1320.4; Thu, 18 Oct 2018 13:07:28 +0800 From: Jianxin Pan To: Jerome Brunet , Neil Armstrong CC: Yixun Lan , Jianxin Pan , Kevin Hilman , Carlo Caione , Michael Turquette , Stephen Boyd , Rob Herring , Miquel Raynal , Boris Brezillon , Martin Blumenstingl , Liang Yang , Jian Hu , Qiufang Dai , Hanjie Lin , Victor Wan , , , , Subject: [PATCH v5 3/3] clk: meson: add sub MMC clock controller driver Date: Thu, 18 Oct 2018 13:07:25 +0800 Message-ID: <1539839245-13793-4-git-send-email-jianxin.pan@amlogic.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1539839245-13793-1-git-send-email-jianxin.pan@amlogic.com> References: <1539839245-13793-1-git-send-email-jianxin.pan@amlogic.com> MIME-Version: 1.0 X-Originating-IP: [10.18.11.217] Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Yixun Lan The patch will add a MMC clock controller driver which used by MMC or NAND, It provide a mux and divider clock, and three phase clocks - core, tx, tx. Two clocks are provided as the parent of MMC clock controller from upper layer clock controller - eg "amlogic,axg-clkc" in AXG platform. To specify which clock the MMC or NAND driver may consume, the preprocessor macros in the dt-bindings/clock/amlogic,mmc-clkc.h header can be used in the device tree sources. Signed-off-by: Yixun Lan Signed-off-by: Jianxin Pan --- drivers/clk/meson/Kconfig | 10 ++ drivers/clk/meson/Makefile | 1 + drivers/clk/meson/clk-regmap.c | 27 +++- drivers/clk/meson/clk-regmap.h | 1 + drivers/clk/meson/mmc-clkc.c | 296 +++++++++++++++++++++++++++++++++++++++++ 5 files changed, 334 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/meson/mmc-clkc.c diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig index efaa70f..8b8ccbc 100644 --- a/drivers/clk/meson/Kconfig +++ b/drivers/clk/meson/Kconfig @@ -15,6 +15,16 @@ config COMMON_CLK_MESON_AO select COMMON_CLK_REGMAP_MESON select RESET_CONTROLLER +config COMMON_CLK_MMC_MESON + tristate "Meson MMC Sub Clock Controller Driver" + depends on COMMON_CLK_AMLOGIC + select MFD_SYSCON + select REGMAP + help + Support for the MMC sub clock controller on Amlogic Meson Platform, + which include S905 (GXBB, GXL), A113D/X (AXG) devices. + Say Y if you want this clock enabled. + config COMMON_CLK_REGMAP_MESON bool select REGMAP diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index 39ce566..31c16d5 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -9,4 +9,5 @@ obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o obj-$(CONFIG_COMMON_CLK_AXG) += axg.o axg-aoclk.o obj-$(CONFIG_COMMON_CLK_AXG_AUDIO) += axg-audio.o +obj-$(CONFIG_COMMON_CLK_MMC_MESON) += mmc-clkc.o obj-$(CONFIG_COMMON_CLK_REGMAP_MESON) += clk-regmap.o diff --git a/drivers/clk/meson/clk-regmap.c b/drivers/clk/meson/clk-regmap.c index 305ee30..f96314d 100644 --- a/drivers/clk/meson/clk-regmap.c +++ b/drivers/clk/meson/clk-regmap.c @@ -113,8 +113,25 @@ static int clk_regmap_div_set_rate(struct clk_hw *hw, unsigned long rate, clk_div_mask(div->width) << div->shift, val); }; -/* Would prefer clk_regmap_div_ro_ops but clashes with qcom */ +static void clk_regmap_div_init(struct clk_hw *hw) +{ + struct clk_regmap *clk = to_clk_regmap(hw); + struct clk_regmap_div_data *div = clk_get_regmap_div_data(clk); + unsigned int val; + int ret; + + ret = regmap_read(clk->map, div->offset, &val); + if (ret) + return; + val &= (clk_div_mask(div->width) << div->shift); + if (!val) + regmap_update_bits(clk->map, div->offset, + clk_div_mask(div->width) << div->shift, + clk_div_mask(div->width)); +} + +/* Would prefer clk_regmap_div_ro_ops but clashes with qcom */ const struct clk_ops clk_regmap_divider_ops = { .recalc_rate = clk_regmap_div_recalc_rate, .round_rate = clk_regmap_div_round_rate, @@ -122,6 +139,14 @@ static int clk_regmap_div_set_rate(struct clk_hw *hw, unsigned long rate, }; EXPORT_SYMBOL_GPL(clk_regmap_divider_ops); +const struct clk_ops clk_regmap_divider_with_init_ops = { + .recalc_rate = clk_regmap_div_recalc_rate, + .round_rate = clk_regmap_div_round_rate, + .set_rate = clk_regmap_div_set_rate, + .init = clk_regmap_div_init, +}; +EXPORT_SYMBOL_GPL(clk_regmap_divider_with_init_ops); + const struct clk_ops clk_regmap_divider_ro_ops = { .recalc_rate = clk_regmap_div_recalc_rate, .round_rate = clk_regmap_div_round_rate, diff --git a/drivers/clk/meson/clk-regmap.h b/drivers/clk/meson/clk-regmap.h index ed2d434..0ab7d37 100644 --- a/drivers/clk/meson/clk-regmap.h +++ b/drivers/clk/meson/clk-regmap.h @@ -109,5 +109,6 @@ struct clk_regmap_mux_data { extern const struct clk_ops clk_regmap_mux_ops; extern const struct clk_ops clk_regmap_mux_ro_ops; +extern const struct clk_ops clk_regmap_divider_with_init_ops; #endif /* __CLK_REGMAP_H */ diff --git a/drivers/clk/meson/mmc-clkc.c b/drivers/clk/meson/mmc-clkc.c new file mode 100644 index 0000000..5555e3f --- /dev/null +++ b/drivers/clk/meson/mmc-clkc.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Amlogic Meson MMC Sub Clock Controller Driver + * + * Copyright (c) 2017 Baylibre SAS. + * Author: Jerome Brunet + * + * Copyright (c) 2018 Amlogic, inc. + * Author: Yixun Lan + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "clkc.h" + +/* clock ID used by internal driver */ +#define CLKID_MMC_MUX 0 + +#define SD_EMMC_CLOCK 0 +#define CLK_DELAY_STEP_PS 200 +#define CLK_PHASE_STEP 30 +#define CLK_PHASE_POINT_NUM (360 / CLK_PHASE_STEP) + +#define MUX_CLK_NUM_PARENTS 2 +#define MMC_MAX_CLKS 5 + +struct mmc_clkc_data { + struct meson_clk_phase_delay_data tx; + struct meson_clk_phase_delay_data rx; +}; + +static struct clk_regmap_mux_data mmc_clkc_mux_data = { + .offset = SD_EMMC_CLOCK, + .mask = 0x3, + .shift = 6, + .flags = CLK_DIVIDER_ROUND_CLOSEST, +}; + +static struct clk_regmap_div_data mmc_clkc_div_data = { + .offset = SD_EMMC_CLOCK, + .shift = 0, + .width = 6, + .flags = CLK_DIVIDER_ROUND_CLOSEST | CLK_DIVIDER_ONE_BASED, +}; + +static struct meson_clk_phase_data mmc_clkc_core_phase = { + .ph = { + .reg_off = SD_EMMC_CLOCK, + .shift = 8, + .width = 2, + } +}; + +static const struct mmc_clkc_data mmc_clkc_gx_data = { + .tx = { + .phase = { + .reg_off = SD_EMMC_CLOCK, + .shift = 10, + .width = 2, + }, + .delay = { + .reg_off = SD_EMMC_CLOCK, + .shift = 16, + .width = 4, + }, + .delay_step_ps = CLK_DELAY_STEP_PS, + }, + .rx = { + .phase = { + .reg_off = SD_EMMC_CLOCK, + .shift = 12, + .width = 2, + }, + .delay = { + .reg_off = SD_EMMC_CLOCK, + .shift = 20, + .width = 4, + }, + .delay_step_ps = CLK_DELAY_STEP_PS, + }, +}; + +static const struct mmc_clkc_data mmc_clkc_axg_data = { + .tx = { + .phase = { + .reg_off = SD_EMMC_CLOCK, + .shift = 10, + .width = 2, + }, + .delay = { + .reg_off = SD_EMMC_CLOCK, + .shift = 16, + .width = 6, + }, + .delay_step_ps = CLK_DELAY_STEP_PS, + }, + .rx = { + .phase = { + .reg_off = SD_EMMC_CLOCK, + .shift = 12, + .width = 2, + }, + .delay = { + .reg_off = SD_EMMC_CLOCK, + .shift = 22, + .width = 6, + }, + .delay_step_ps = CLK_DELAY_STEP_PS, + }, +}; + +static const struct of_device_id mmc_clkc_match_table[] = { + { + .compatible = "amlogic,gx-mmc-clkc", + .data = &mmc_clkc_gx_data + }, + { + .compatible = "amlogic,axg-mmc-clkc", + .data = &mmc_clkc_axg_data + }, + {} +}; +MODULE_DEVICE_TABLE(of, mmc_clkc_match_table); + +static struct clk_regmap * +mmc_clkc_register_clk(struct device *dev, struct regmap *map, + struct clk_init_data *init, + const char *suffix, void *data) +{ + struct clk_regmap *clk; + char *name; + int ret; + + clk = devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL); + if (!clk) + return ERR_PTR(-ENOMEM); + + name = kasprintf(GFP_KERNEL, "%s#%s", dev_name(dev), suffix); + if (!name) + return ERR_PTR(-ENOMEM); + + init->name = name; + + clk->map = map; + clk->data = data; + clk->hw.init = init; + + ret = devm_clk_hw_register(dev, &clk->hw); + if (ret) + clk = ERR_PTR(ret); + + kfree(name); + return clk; +} + +static struct clk_regmap *mmc_clkc_register_mux(struct device *dev, + struct regmap *map) +{ + const char *parent_names[MUX_CLK_NUM_PARENTS]; + struct clk_init_data init; + struct clk_regmap *mux; + struct clk *clk; + int i; + + for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) { + char name[8]; + + snprintf(name, sizeof(name), "clkin%d", i); + clk = devm_clk_get(dev, name); + if (IS_ERR(clk)) { + if (clk != ERR_PTR(-EPROBE_DEFER)) + dev_err(dev, "Missing clock %s\n", name); + return ERR_PTR((long)clk); + } + + parent_names[i] = __clk_get_name(clk); + } + + init.ops = &clk_regmap_mux_ops; + init.flags = CLK_SET_RATE_PARENT; + init.parent_names = parent_names; + init.num_parents = MUX_CLK_NUM_PARENTS; + + mux = mmc_clkc_register_clk(dev, map, &init, "mux", &mmc_clkc_mux_data); + if (IS_ERR(mux)) + dev_err(dev, "Mux clock registration failed\n"); + + return mux; +} + +static struct clk_regmap * +mmc_clkc_register_clk_with_parent(struct device *dev, struct regmap *map, + char *suffix, const char *parent, + unsigned long flags, + const struct clk_ops *ops, void *data) +{ + struct clk_init_data init; + struct clk_regmap *clk; + + init.ops = ops; + init.flags = flags; + init.parent_names = (const char* const []){ parent, }; + init.num_parents = 1; + + clk = mmc_clkc_register_clk(dev, map, &init, suffix, data); + if (IS_ERR(clk)) + dev_err(dev, "Core %s clock registration failed\n", suffix); + + return clk; +} + +static int mmc_clkc_probe(struct platform_device *pdev) +{ + struct clk_hw_onecell_data *onecell_data; + struct device *dev = &pdev->dev; + struct mmc_clkc_data *data; + struct regmap *map; + struct clk_regmap *mux, *div, *core, *rx, *tx; + + data = (struct mmc_clkc_data *)of_device_get_match_data(dev); + if (!data) + return -ENODEV; + + map = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(map)) { + dev_err(dev, "could not find mmc clock controller\n"); + return PTR_ERR(map); + } + + onecell_data = devm_kzalloc(dev, sizeof(*onecell_data) + + sizeof(*onecell_data->hws) * MMC_MAX_CLKS, + GFP_KERNEL); + if (!onecell_data) + return -ENOMEM; + + mux = mmc_clkc_register_mux(dev, map); + if (IS_ERR(mux)) + return PTR_ERR(mux); + + div = mmc_clkc_register_clk_with_parent(dev, map, "div", + clk_hw_get_name(&mux->hw), + CLK_SET_RATE_PARENT, + &clk_regmap_divider_with_init_ops, + &mmc_clkc_div_data); + if (IS_ERR(div)) + return PTR_ERR(div); + + core = mmc_clkc_register_clk_with_parent(dev, map, "core", + clk_hw_get_name(&div->hw), + CLK_SET_RATE_PARENT, + &meson_clk_phase_ops, + &mmc_clkc_core_phase); + if (IS_ERR(core)) + return PTR_ERR(core); + + rx = mmc_clkc_register_clk_with_parent(dev, map, "rx", + clk_hw_get_name(&core->hw), 0, + &meson_clk_phase_delay_ops, + &data->rx); + if (IS_ERR(rx)) + return PTR_ERR(rx); + + tx = mmc_clkc_register_clk_with_parent(dev, map, "tx", + clk_hw_get_name(&core->hw), 0, + &meson_clk_phase_delay_ops, + &data->tx); + if (IS_ERR(tx)) + return PTR_ERR(tx); + + onecell_data->hws[CLKID_MMC_MUX] = &mux->hw, + onecell_data->hws[CLKID_MMC_DIV] = &div->hw, + onecell_data->hws[CLKID_MMC_PHASE_CORE] = &core->hw, + onecell_data->hws[CLKID_MMC_PHASE_RX] = &rx->hw, + onecell_data->hws[CLKID_MMC_PHASE_TX] = &tx->hw, + onecell_data->num = MMC_MAX_CLKS; + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, + onecell_data); +} + +static struct platform_driver mmc_clkc_driver = { + .probe = mmc_clkc_probe, + .driver = { + .name = "meson-mmc-clkc", + .of_match_table = of_match_ptr(mmc_clkc_match_table), + }, +}; + +module_platform_driver(mmc_clkc_driver);