drivers/clk/sunxi/clk-usb.c

   1 /*
   2  * Copyright 2013-2015 Emilio López
   3  *
   4  * Emilio López <emilio@elopez.com.ar>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/reset-controller.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24
  25
  26 /**
  27  * sunxi_usb_reset... - reset bits in usb clk registers handling
  28  */
  29
  30 struct usb_reset_data {
  31         void __iomem                    *reg;
  32         spinlock_t                      *lock;
  33         struct clk                      *clk;
  34         struct reset_controller_dev     rcdev;
  35 };
  36
  37 static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
  38                               unsigned long id)
  39 {
  40         struct usb_reset_data *data = container_of(rcdev,
  41                                                    struct usb_reset_data,
  42                                                    rcdev);
  43         unsigned long flags;
  44         u32 reg;
  45
  46         clk_prepare_enable(data->clk);
  47         spin_lock_irqsave(data->lock, flags);
  48
  49         reg = readl(data->reg);
  50         writel(reg & ~BIT(id), data->reg);
  51
  52         spin_unlock_irqrestore(data->lock, flags);
  53         clk_disable_unprepare(data->clk);
  54
  55         return 0;
  56 }
  57
  58 static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
  59                                 unsigned long id)
  60 {
  61         struct usb_reset_data *data = container_of(rcdev,
  62                                                      struct usb_reset_data,
  63                                                      rcdev);
  64         unsigned long flags;
  65         u32 reg;
  66
  67         clk_prepare_enable(data->clk);
  68         spin_lock_irqsave(data->lock, flags);
  69
  70         reg = readl(data->reg);
  71         writel(reg | BIT(id), data->reg);
  72
  73         spin_unlock_irqrestore(data->lock, flags);
  74         clk_disable_unprepare(data->clk);
  75
  76         return 0;
  77 }
  78
  79 static const struct reset_control_ops sunxi_usb_reset_ops = {
  80         .assert         = sunxi_usb_reset_assert,
  81         .deassert       = sunxi_usb_reset_deassert,
  82 };
  83
  84 /**
  85  * sunxi_usb_clk_setup() - Setup function for usb gate clocks
  86  */
  87
  88 #define SUNXI_USB_MAX_SIZE 32
  89
  90 struct usb_clk_data {
  91         u32 clk_mask;
  92         u32 reset_mask;
  93         bool reset_needs_clk;
  94 };
  95
  96 static void __init sunxi_usb_clk_setup(struct device_node *node,
  97                                        const struct usb_clk_data *data,
  98                                        spinlock_t *lock)
  99 {
 100         struct clk_onecell_data *clk_data;
 101         struct usb_reset_data *reset_data;
 102         const char *clk_parent;
 103         const char *clk_name;
 104         void __iomem *reg;
 105         int qty;
 106         int i = 0;
 107         int j = 0;
 108
 109         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
 110         if (IS_ERR(reg))
 111                 return;
 112
 113         clk_parent = of_clk_get_parent_name(node, 0);
 114         if (!clk_parent)
 115                 return;
 116
 117         /* Worst-case size approximation and memory allocation */
 118         qty = find_last_bit((unsigned long *)&data->clk_mask,
 119                             SUNXI_USB_MAX_SIZE);
 120
 121         clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
 122         if (!clk_data)
 123                 return;
 124
 125         clk_data->clks = kzalloc((qty+1) * sizeof(struct clk *), GFP_KERNEL);
 126         if (!clk_data->clks) {
 127                 kfree(clk_data);
 128                 return;
 129         }
 130
 131         for_each_set_bit(i, (unsigned long *)&data->clk_mask,
 132                          SUNXI_USB_MAX_SIZE) {
 133                 of_property_read_string_index(node, "clock-output-names",
 134                                               j, &clk_name);
 135                 clk_data->clks[i] = clk_register_gate(NULL, clk_name,
 136                                                       clk_parent, 0,
 137                                                       reg, i, 0, lock);
 138                 WARN_ON(IS_ERR(clk_data->clks[i]));
 139
 140                 j++;
 141         }
 142
 143         /* Adjust to the real max */
 144         clk_data->clk_num = i;
 145
 146         of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
 147
 148         /* Register a reset controller for usb with reset bits */
 149         if (data->reset_mask == 0)
 150                 return;
 151
 152         reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
 153         if (!reset_data)
 154                 return;
 155
 156         if (data->reset_needs_clk) {
 157                 reset_data->clk = of_clk_get(node, 0);
 158                 if (IS_ERR(reset_data->clk)) {
 159                         pr_err("Could not get clock for reset controls\n");
 160                         kfree(reset_data);
 161                         return;
 162                 }
 163         }
 164
 165         reset_data->reg = reg;
 166         reset_data->lock = lock;
 167         reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
 168         reset_data->rcdev.ops = &sunxi_usb_reset_ops;
 169         reset_data->rcdev.of_node = node;
 170         reset_controller_register(&reset_data->rcdev);
 171 }
 172
 173 static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
 174         .clk_mask = BIT(8) | BIT(7) | BIT(6),
 175         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 176 };
 177
 178 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
 179
 180 static void __init sun4i_a10_usb_setup(struct device_node *node)
 181 {
 182         sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
 183 }
 184 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
 185
 186 static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
 187         .clk_mask = BIT(8) | BIT(6),
 188         .reset_mask = BIT(1) | BIT(0),
 189 };
 190
 191 static void __init sun5i_a13_usb_setup(struct device_node *node)
 192 {
 193         sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
 194 }
 195 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
 196
 197 static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
 198         .clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
 199         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 200 };
 201
 202 static void __init sun6i_a31_usb_setup(struct device_node *node)
 203 {
 204         sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
 205 }
 206 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
 207
 208 static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
 209         .clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
 210         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 211 };
 212
 213 static void __init sun8i_a23_usb_setup(struct device_node *node)
 214 {
 215         sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
 216 }
 217 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
 218
 219 static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
 220         .clk_mask =  BIT(19) | BIT(18) | BIT(17) | BIT(16) |
 221                      BIT(11) | BIT(10) | BIT(9) | BIT(8),
 222         .reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
 223 };
 224
 225 static void __init sun8i_h3_usb_setup(struct device_node *node)
 226 {
 227         sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
 228 }
 229 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
 230
 231 static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
 232         .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
 233         .reset_mask = BIT(19) | BIT(18) | BIT(17),
 234         .reset_needs_clk = 1,
 235 };
 236
 237 static DEFINE_SPINLOCK(a80_usb_mod_lock);
 238
 239 static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
 240 {
 241         sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
 242 }
 243 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
 244
 245 static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
 246         .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
 247         .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
 248         .reset_needs_clk = 1,
 249 };
 250
 251 static DEFINE_SPINLOCK(a80_usb_phy_lock);
 252
 253 static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
 254 {
 255         sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
 256 }
 257 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);