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/io.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/reset-controller.h>
  23 #include <linux/slab.h>
  24 #include <linux/spinlock.h>
  25
  26
  27 /**
  28  * sunxi_usb_reset... - reset bits in usb clk registers handling
  29  */
  30
  31 struct usb_reset_data {
  32         void __iomem                    *reg;
  33         spinlock_t                      *lock;
  34         struct clk                      *clk;
  35         struct reset_controller_dev     rcdev;
  36 };
  37
  38 static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
  39                               unsigned long id)
  40 {
  41         struct usb_reset_data *data = container_of(rcdev,
  42                                                    struct usb_reset_data,
  43                                                    rcdev);
  44         unsigned long flags;
  45         u32 reg;
  46
  47         clk_prepare_enable(data->clk);
  48         spin_lock_irqsave(data->lock, flags);
  49
  50         reg = readl(data->reg);
  51         writel(reg & ~BIT(id), data->reg);
  52
  53         spin_unlock_irqrestore(data->lock, flags);
  54         clk_disable_unprepare(data->clk);
  55
  56         return 0;
  57 }
  58
  59 static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
  60                                 unsigned long id)
  61 {
  62         struct usb_reset_data *data = container_of(rcdev,
  63                                                      struct usb_reset_data,
  64                                                      rcdev);
  65         unsigned long flags;
  66         u32 reg;
  67
  68         clk_prepare_enable(data->clk);
  69         spin_lock_irqsave(data->lock, flags);
  70
  71         reg = readl(data->reg);
  72         writel(reg | BIT(id), data->reg);
  73
  74         spin_unlock_irqrestore(data->lock, flags);
  75         clk_disable_unprepare(data->clk);
  76
  77         return 0;
  78 }
  79
  80 static const struct reset_control_ops sunxi_usb_reset_ops = {
  81         .assert         = sunxi_usb_reset_assert,
  82         .deassert       = sunxi_usb_reset_deassert,
  83 };
  84
  85 /**
  86  * sunxi_usb_clk_setup() - Setup function for usb gate clocks
  87  */
  88
  89 #define SUNXI_USB_MAX_SIZE 32
  90
  91 struct usb_clk_data {
  92         u32 clk_mask;
  93         u32 reset_mask;
  94         bool reset_needs_clk;
  95 };
  96
  97 static void __init sunxi_usb_clk_setup(struct device_node *node,
  98                                        const struct usb_clk_data *data,
  99                                        spinlock_t *lock)
 100 {
 101         struct clk_onecell_data *clk_data;
 102         struct usb_reset_data *reset_data;
 103         const char *clk_parent;
 104         const char *clk_name;
 105         void __iomem *reg;
 106         int qty;
 107         int i = 0;
 108         int j = 0;
 109
 110         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
 111         if (IS_ERR(reg))
 112                 return;
 113
 114         clk_parent = of_clk_get_parent_name(node, 0);
 115         if (!clk_parent)
 116                 return;
 117
 118         /* Worst-case size approximation and memory allocation */
 119         qty = find_last_bit((unsigned long *)&data->clk_mask,
 120                             SUNXI_USB_MAX_SIZE);
 121
 122         clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
 123         if (!clk_data)
 124                 return;
 125
 126         clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);
 127         if (!clk_data->clks) {
 128                 kfree(clk_data);
 129                 return;
 130         }
 131
 132         for_each_set_bit(i, (unsigned long *)&data->clk_mask,
 133                          SUNXI_USB_MAX_SIZE) {
 134                 of_property_read_string_index(node, "clock-output-names",
 135                                               j, &clk_name);
 136                 clk_data->clks[i] = clk_register_gate(NULL, clk_name,
 137                                                       clk_parent, 0,
 138                                                       reg, i, 0, lock);
 139                 WARN_ON(IS_ERR(clk_data->clks[i]));
 140
 141                 j++;
 142         }
 143
 144         /* Adjust to the real max */
 145         clk_data->clk_num = i;
 146
 147         of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
 148
 149         /* Register a reset controller for usb with reset bits */
 150         if (data->reset_mask == 0)
 151                 return;
 152
 153         reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
 154         if (!reset_data)
 155                 return;
 156
 157         if (data->reset_needs_clk) {
 158                 reset_data->clk = of_clk_get(node, 0);
 159                 if (IS_ERR(reset_data->clk)) {
 160                         pr_err("Could not get clock for reset controls\n");
 161                         kfree(reset_data);
 162                         return;
 163                 }
 164         }
 165
 166         reset_data->reg = reg;
 167         reset_data->lock = lock;
 168         reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
 169         reset_data->rcdev.ops = &sunxi_usb_reset_ops;
 170         reset_data->rcdev.of_node = node;
 171         reset_controller_register(&reset_data->rcdev);
 172 }
 173
 174 static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
 175         .clk_mask = BIT(8) | BIT(7) | BIT(6),
 176         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 177 };
 178
 179 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
 180
 181 static void __init sun4i_a10_usb_setup(struct device_node *node)
 182 {
 183         sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
 184 }
 185 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
 186
 187 static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
 188         .clk_mask = BIT(8) | BIT(6),
 189         .reset_mask = BIT(1) | BIT(0),
 190 };
 191
 192 static void __init sun5i_a13_usb_setup(struct device_node *node)
 193 {
 194         sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
 195 }
 196 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
 197
 198 static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
 199         .clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
 200         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 201 };
 202
 203 static void __init sun6i_a31_usb_setup(struct device_node *node)
 204 {
 205         sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
 206 }
 207 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
 208
 209 static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
 210         .clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
 211         .reset_mask = BIT(2) | BIT(1) | BIT(0),
 212 };
 213
 214 static void __init sun8i_a23_usb_setup(struct device_node *node)
 215 {
 216         sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
 217 }
 218 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
 219
 220 static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
 221         .clk_mask =  BIT(19) | BIT(18) | BIT(17) | BIT(16) |
 222                      BIT(11) | BIT(10) | BIT(9) | BIT(8),
 223         .reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
 224 };
 225
 226 static void __init sun8i_h3_usb_setup(struct device_node *node)
 227 {
 228         sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
 229 }
 230 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
 231
 232 static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
 233         .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
 234         .reset_mask = BIT(19) | BIT(18) | BIT(17),
 235         .reset_needs_clk = 1,
 236 };
 237
 238 static DEFINE_SPINLOCK(a80_usb_mod_lock);
 239
 240 static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
 241 {
 242         sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
 243 }
 244 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
 245
 246 static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
 247         .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
 248         .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
 249         .reset_needs_clk = 1,
 250 };
 251
 252 static DEFINE_SPINLOCK(a80_usb_phy_lock);
 253
 254 static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
 255 {
 256         sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
 257 }
 258 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);