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