253 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2013-2015 Emilio López4 *5 * Emilio López <emilio@elopez.com.ar>6 */7 8#include <linux/clk.h>9#include <linux/clk-provider.h>10#include <linux/io.h>11#include <linux/of.h>12#include <linux/of_address.h>13#include <linux/reset-controller.h>14#include <linux/slab.h>15#include <linux/spinlock.h>16 17 18/*19 * sunxi_usb_reset... - reset bits in usb clk registers handling20 */21 22struct usb_reset_data {23 void __iomem *reg;24 spinlock_t *lock;25 struct clk *clk;26 struct reset_controller_dev rcdev;27};28 29static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,30 unsigned long id)31{32 struct usb_reset_data *data = container_of(rcdev,33 struct usb_reset_data,34 rcdev);35 unsigned long flags;36 u32 reg;37 38 clk_prepare_enable(data->clk);39 spin_lock_irqsave(data->lock, flags);40 41 reg = readl(data->reg);42 writel(reg & ~BIT(id), data->reg);43 44 spin_unlock_irqrestore(data->lock, flags);45 clk_disable_unprepare(data->clk);46 47 return 0;48}49 50static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,51 unsigned long id)52{53 struct usb_reset_data *data = container_of(rcdev,54 struct usb_reset_data,55 rcdev);56 unsigned long flags;57 u32 reg;58 59 clk_prepare_enable(data->clk);60 spin_lock_irqsave(data->lock, flags);61 62 reg = readl(data->reg);63 writel(reg | BIT(id), data->reg);64 65 spin_unlock_irqrestore(data->lock, flags);66 clk_disable_unprepare(data->clk);67 68 return 0;69}70 71static const struct reset_control_ops sunxi_usb_reset_ops = {72 .assert = sunxi_usb_reset_assert,73 .deassert = sunxi_usb_reset_deassert,74};75 76 77#define SUNXI_USB_MAX_SIZE 3278 79struct usb_clk_data {80 u32 clk_mask;81 u32 reset_mask;82 bool reset_needs_clk;83};84 85/**86 * sunxi_usb_clk_setup() - Setup function for usb gate clocks87 * @node: &struct device_node for the clock88 * @data: &struct usb_clk_data for the clock89 * @lock: spinlock for the clock90 */91static void __init sunxi_usb_clk_setup(struct device_node *node,92 const struct usb_clk_data *data,93 spinlock_t *lock)94{95 struct clk_onecell_data *clk_data;96 struct usb_reset_data *reset_data;97 const char *clk_parent;98 const char *clk_name;99 void __iomem *reg;100 int qty;101 int i = 0;102 int j = 0;103 104 reg = of_io_request_and_map(node, 0, of_node_full_name(node));105 if (IS_ERR(reg))106 return;107 108 clk_parent = of_clk_get_parent_name(node, 0);109 if (!clk_parent)110 return;111 112 /* Worst-case size approximation and memory allocation */113 qty = find_last_bit((unsigned long *)&data->clk_mask,114 SUNXI_USB_MAX_SIZE);115 116 clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);117 if (!clk_data)118 return;119 120 clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);121 if (!clk_data->clks) {122 kfree(clk_data);123 return;124 }125 126 for_each_set_bit(i, (unsigned long *)&data->clk_mask,127 SUNXI_USB_MAX_SIZE) {128 of_property_read_string_index(node, "clock-output-names",129 j, &clk_name);130 clk_data->clks[i] = clk_register_gate(NULL, clk_name,131 clk_parent, 0,132 reg, i, 0, lock);133 WARN_ON(IS_ERR(clk_data->clks[i]));134 135 j++;136 }137 138 /* Adjust to the real max */139 clk_data->clk_num = i;140 141 of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);142 143 /* Register a reset controller for usb with reset bits */144 if (data->reset_mask == 0)145 return;146 147 reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);148 if (!reset_data)149 return;150 151 if (data->reset_needs_clk) {152 reset_data->clk = of_clk_get(node, 0);153 if (IS_ERR(reset_data->clk)) {154 pr_err("Could not get clock for reset controls\n");155 kfree(reset_data);156 return;157 }158 }159 160 reset_data->reg = reg;161 reset_data->lock = lock;162 reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;163 reset_data->rcdev.ops = &sunxi_usb_reset_ops;164 reset_data->rcdev.of_node = node;165 reset_controller_register(&reset_data->rcdev);166}167 168static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {169 .clk_mask = BIT(8) | BIT(7) | BIT(6),170 .reset_mask = BIT(2) | BIT(1) | BIT(0),171};172 173static DEFINE_SPINLOCK(sun4i_a10_usb_lock);174 175static void __init sun4i_a10_usb_setup(struct device_node *node)176{177 sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);178}179CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);180 181static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {182 .clk_mask = BIT(8) | BIT(6),183 .reset_mask = BIT(1) | BIT(0),184};185 186static void __init sun5i_a13_usb_setup(struct device_node *node)187{188 sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);189}190CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);191 192static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {193 .clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),194 .reset_mask = BIT(2) | BIT(1) | BIT(0),195};196 197static void __init sun6i_a31_usb_setup(struct device_node *node)198{199 sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);200}201CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);202 203static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {204 .clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),205 .reset_mask = BIT(2) | BIT(1) | BIT(0),206};207 208static void __init sun8i_a23_usb_setup(struct device_node *node)209{210 sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);211}212CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);213 214static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {215 .clk_mask = BIT(19) | BIT(18) | BIT(17) | BIT(16) |216 BIT(11) | BIT(10) | BIT(9) | BIT(8),217 .reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),218};219 220static void __init sun8i_h3_usb_setup(struct device_node *node)221{222 sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);223}224CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);225 226static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {227 .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),228 .reset_mask = BIT(19) | BIT(18) | BIT(17),229 .reset_needs_clk = 1,230};231 232static DEFINE_SPINLOCK(a80_usb_mod_lock);233 234static void __init sun9i_a80_usb_mod_setup(struct device_node *node)235{236 sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);237}238CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);239 240static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {241 .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),242 .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),243 .reset_needs_clk = 1,244};245 246static DEFINE_SPINLOCK(a80_usb_phy_lock);247 248static void __init sun9i_a80_usb_phy_setup(struct device_node *node)249{250 sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);251}252CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);253