Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752146AbaKDEIc (ORCPT ); Mon, 3 Nov 2014 23:08:32 -0500 Received: from smtp.csie.ntu.edu.tw ([140.112.30.61]:48809 "EHLO smtp.csie.ntu.edu.tw" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751337AbaKDEHZ (ORCPT ); Mon, 3 Nov 2014 23:07:25 -0500 From: Chen-Yu Tsai To: Maxime Ripard , Kishon Vijay Abraham I , Mike Turquette , Grant Likely , Rob Herring Cc: Chen-Yu Tsai , Hans de Goede , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com Subject: [PATCH 1/6] clk: sunxi: Add support for sun9i a80 usb clocks and resets Date: Tue, 4 Nov 2014 12:07:14 +0800 Message-Id: <1415074039-16590-2-git-send-email-wens@csie.org> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1415074039-16590-1-git-send-email-wens@csie.org> References: <1415074039-16590-1-git-send-email-wens@csie.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The USB controller/phy clocks and reset controls are in a separate address block, unlike previous SoCs where they were in the clock controller. This patch copies the original gates clk functions used for usb clocks into a separate file, and renames them to *_usb_*. Also add a per-gate parent index, so we can set different parents for each gate. In time we may move the other usb clock drivers to this file. Signed-off-by: Chen-Yu Tsai --- Documentation/devicetree/bindings/clock/sunxi.txt | 5 + drivers/clk/sunxi/Makefile | 1 + drivers/clk/sunxi/clk-usb.c | 192 ++++++++++++++++++++++ 3 files changed, 198 insertions(+) create mode 100644 drivers/clk/sunxi/clk-usb.c diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt index 0455cb9..b953fe5 100644 --- a/Documentation/devicetree/bindings/clock/sunxi.txt +++ b/Documentation/devicetree/bindings/clock/sunxi.txt @@ -66,6 +66,8 @@ Required properties: "allwinner,sun4i-a10-usb-clk" - for usb gates + resets on A10 / A20 "allwinner,sun5i-a13-usb-clk" - for usb gates + resets on A13 "allwinner,sun6i-a31-usb-clk" - for usb gates + resets on A31 + "allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80 + "allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80 Required properties for all clocks: - reg : shall be the control register address for the clock. @@ -82,6 +84,9 @@ Required properties for all clocks: And "allwinner,*-usb-clk" clocks also require: - reset-cells : shall be set to 1 +"allwinner,sun9i-a80-usb-*-clk" clocks require: +- clocks : shall be the usb hci ahb1 gate and peripheral pll clocks + For "allwinner,sun7i-a20-gmac-clk", the parent clocks shall be fixed rate dummy clocks at 25 MHz and 125 MHz, respectively. See example. diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile index a66953c..f19ce54 100644 --- a/drivers/clk/sunxi/Makefile +++ b/drivers/clk/sunxi/Makefile @@ -8,6 +8,7 @@ obj-y += clk-a20-gmac.o obj-y += clk-mod0.o obj-y += clk-sun8i-mbus.o obj-y += clk-sun9i-core.o +obj-y += clk-usb.o obj-$(CONFIG_MFD_SUN6I_PRCM) += \ clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o \ diff --git a/drivers/clk/sunxi/clk-usb.c b/drivers/clk/sunxi/clk-usb.c new file mode 100644 index 0000000..d92ee36 --- /dev/null +++ b/drivers/clk/sunxi/clk-usb.c @@ -0,0 +1,192 @@ +/* + * Copyright 2013 Emilio López + * + * Emilio López + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include + + +/** + * sunxi_usb_reset... - reset bits in usb clk registers handling + */ + +struct usb_reset_data { + void __iomem *reg; + spinlock_t *lock; + struct reset_controller_dev rcdev; +}; + +static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct usb_reset_data *data = container_of(rcdev, + struct usb_reset_data, + rcdev); + unsigned long flags; + u32 reg; + + spin_lock_irqsave(data->lock, flags); + + reg = readl(data->reg); + writel(reg & ~BIT(id), data->reg); + + spin_unlock_irqrestore(data->lock, flags); + + return 0; +} + +static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct usb_reset_data *data = container_of(rcdev, + struct usb_reset_data, + rcdev); + unsigned long flags; + u32 reg; + + spin_lock_irqsave(data->lock, flags); + + reg = readl(data->reg); + writel(reg | BIT(id), data->reg); + + spin_unlock_irqrestore(data->lock, flags); + + return 0; +} + +static struct reset_control_ops sunxi_usb_reset_ops = { + .assert = sunxi_usb_reset_assert, + .deassert = sunxi_usb_reset_deassert, +}; + +/** + * sunxi_usb_clk_setup() - Setup function for usb gate clocks + */ + +#define SUNXI_USB_MAX_SIZE 32 + +struct usb_clk_data { + u32 clk_mask; + u32 reset_mask; + /* which parent to use, should match clock-output-names */ + char parents[SUNXI_USB_MAX_SIZE]; +}; + +static void __init sunxi_usb_clk_setup(struct device_node *node, + const struct usb_clk_data *data, + spinlock_t *lock) +{ + struct clk_onecell_data *clk_data; + struct usb_reset_data *reset_data; + const char *clk_parent; + const char *clk_name; + void __iomem *reg; + int qty; + int i = 0; + int j = 0; + + reg = of_iomap(node, 0); + + /* Worst-case size approximation and memory allocation */ + qty = find_last_bit((unsigned long *)&data->clk_mask, + SUNXI_USB_MAX_SIZE); + clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); + if (!clk_data) + return; + clk_data->clks = kzalloc((qty+1) * sizeof(struct clk *), GFP_KERNEL); + if (!clk_data->clks) { + kfree(clk_data); + return; + } + + for_each_set_bit(i, (unsigned long *)&data->clk_mask, + SUNXI_USB_MAX_SIZE) { + of_property_read_string_index(node, "clock-output-names", + j, &clk_name); + clk_parent = of_clk_get_parent_name(node, data->parents[j]); + + clk_data->clks[i] = clk_register_gate(NULL, clk_name, + clk_parent, 0, + reg, i, 0, lock); + WARN_ON(IS_ERR(clk_data->clks[i])); + clk_register_clkdev(clk_data->clks[i], clk_name, NULL); + + j++; + } + + /* Adjust to the real max */ + clk_data->clk_num = i; + + of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); + + /* Register a reset controller for usb with reset bits */ + if (data->reset_mask == 0) + return; + + reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL); + if (!reset_data) + return; + + reset_data->reg = reg; + reset_data->lock = lock; + reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1; + reset_data->rcdev.ops = &sunxi_usb_reset_ops; + reset_data->rcdev.of_node = node; + reset_controller_register(&reset_data->rcdev); +} + +static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = { + .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1), + .reset_mask = BIT(19) | BIT(18) | BIT(17), + .parents = {0, 1, 0, 1, 0, 1}, +}; + +static DEFINE_SPINLOCK(a80_usb_mod_lock); + +static void __init sun9i_a80_usb_mod_setup(struct device_node *node) +{ + /* AHB1 gate must be enabled to access registers */ + struct clk *ahb = of_clk_get(node, 0); + + WARN_ON(IS_ERR(ahb)); + clk_prepare_enable(ahb); + + sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock); +} +CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup); + +static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = { + .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1), + .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17), + .parents = {1, 1, 1, 1, 1, 1}, +}; + +static DEFINE_SPINLOCK(a80_usb_phy_lock); + +static void __init sun9i_a80_usb_phy_setup(struct device_node *node) +{ + /* AHB1 gate must be enabled to access registers */ + struct clk *ahb = of_clk_get(node, 0); + + WARN_ON(IS_ERR(ahb)); + clk_prepare_enable(ahb); + + sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock); +} +CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup); -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/