drivers/clk/sunxi/clk-usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2013-2015 Emilio López
   4  *
   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 handling
  20  */
  21
  22 struct usb_reset_data {
  23         void __iomem                    *reg;
  24         spinlock_t                      *lock;
  25         struct clk                      *clk;
  26         struct reset_controller_dev     rcdev;
  27 };
  28
  29 static 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
  50 static 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
  71 static 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 32
  78
  79 struct 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 clocks
  87  * @node: &struct device_node for the clock
  88  * @data: &struct usb_clk_data for the clock
  89  * @lock: spinlock for the clock
  90  */
  91 static 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
 168 static 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
 173 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
 174
 175 static 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 }
 179 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
 180
 181 static 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
 186 static 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 }
 190 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
 191
 192 static 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
 197 static 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 }
 201 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
 202
 203 static 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
 208 static 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 }
 212 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
 213
 214 static 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
 220 static 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 }
 224 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
 225
 226 static 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
 232 static DEFINE_SPINLOCK(a80_usb_mod_lock);
 233
 234 static 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 }
 238 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
 239
 240 static 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
 246 static DEFINE_SPINLOCK(a80_usb_phy_lock);
 247
 248 static 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 }
 252 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);