clk/sunxi/clk-usb.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright 2013-2015 Emilio López
0004  *
0005  * Emilio López <emilio@elopez.com.ar>
0006  */
0007
0008 #include <linux/clk.h>
0009 #include <linux/clk-provider.h>
0010 #include <linux/io.h>
0011 #include <linux/of.h>
0012 #include <linux/of_address.h>
0013 #include <linux/reset-controller.h>
0014 #include <linux/slab.h>
0015 #include <linux/spinlock.h>
0016
0017
0018 /*
0019  * sunxi_usb_reset... - reset bits in usb clk registers handling
0020  */
0021
0022 struct usb_reset_data {
0023     void __iomem            *reg;
0024     spinlock_t          *lock;
0025     struct clk          *clk;
0026     struct reset_controller_dev rcdev;
0027 };
0028
0029 static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
0030                   unsigned long id)
0031 {
0032     struct usb_reset_data *data = container_of(rcdev,
0033                            struct usb_reset_data,
0034                            rcdev);
0035     unsigned long flags;
0036     u32 reg;
0037
0038     clk_prepare_enable(data->clk);
0039     spin_lock_irqsave(data->lock, flags);
0040
0041     reg = readl(data->reg);
0042     writel(reg & ~BIT(id), data->reg);
0043
0044     spin_unlock_irqrestore(data->lock, flags);
0045     clk_disable_unprepare(data->clk);
0046
0047     return 0;
0048 }
0049
0050 static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
0051                 unsigned long id)
0052 {
0053     struct usb_reset_data *data = container_of(rcdev,
0054                              struct usb_reset_data,
0055                              rcdev);
0056     unsigned long flags;
0057     u32 reg;
0058
0059     clk_prepare_enable(data->clk);
0060     spin_lock_irqsave(data->lock, flags);
0061
0062     reg = readl(data->reg);
0063     writel(reg | BIT(id), data->reg);
0064
0065     spin_unlock_irqrestore(data->lock, flags);
0066     clk_disable_unprepare(data->clk);
0067
0068     return 0;
0069 }
0070
0071 static const struct reset_control_ops sunxi_usb_reset_ops = {
0072     .assert     = sunxi_usb_reset_assert,
0073     .deassert   = sunxi_usb_reset_deassert,
0074 };
0075
0076 /**
0077  * sunxi_usb_clk_setup() - Setup function for usb gate clocks
0078  */
0079
0080 #define SUNXI_USB_MAX_SIZE 32
0081
0082 struct usb_clk_data {
0083     u32 clk_mask;
0084     u32 reset_mask;
0085     bool reset_needs_clk;
0086 };
0087
0088 static void __init sunxi_usb_clk_setup(struct device_node *node,
0089                        const struct usb_clk_data *data,
0090                        spinlock_t *lock)
0091 {
0092     struct clk_onecell_data *clk_data;
0093     struct usb_reset_data *reset_data;
0094     const char *clk_parent;
0095     const char *clk_name;
0096     void __iomem *reg;
0097     int qty;
0098     int i = 0;
0099     int j = 0;
0100
0101     reg = of_io_request_and_map(node, 0, of_node_full_name(node));
0102     if (IS_ERR(reg))
0103         return;
0104
0105     clk_parent = of_clk_get_parent_name(node, 0);
0106     if (!clk_parent)
0107         return;
0108
0109     /* Worst-case size approximation and memory allocation */
0110     qty = find_last_bit((unsigned long *)&data->clk_mask,
0111                 SUNXI_USB_MAX_SIZE);
0112
0113     clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
0114     if (!clk_data)
0115         return;
0116
0117     clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);
0118     if (!clk_data->clks) {
0119         kfree(clk_data);
0120         return;
0121     }
0122
0123     for_each_set_bit(i, (unsigned long *)&data->clk_mask,
0124              SUNXI_USB_MAX_SIZE) {
0125         of_property_read_string_index(node, "clock-output-names",
0126                           j, &clk_name);
0127         clk_data->clks[i] = clk_register_gate(NULL, clk_name,
0128                               clk_parent, 0,
0129                               reg, i, 0, lock);
0130         WARN_ON(IS_ERR(clk_data->clks[i]));
0131
0132         j++;
0133     }
0134
0135     /* Adjust to the real max */
0136     clk_data->clk_num = i;
0137
0138     of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
0139
0140     /* Register a reset controller for usb with reset bits */
0141     if (data->reset_mask == 0)
0142         return;
0143
0144     reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
0145     if (!reset_data)
0146         return;
0147
0148     if (data->reset_needs_clk) {
0149         reset_data->clk = of_clk_get(node, 0);
0150         if (IS_ERR(reset_data->clk)) {
0151             pr_err("Could not get clock for reset controls\n");
0152             kfree(reset_data);
0153             return;
0154         }
0155     }
0156
0157     reset_data->reg = reg;
0158     reset_data->lock = lock;
0159     reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
0160     reset_data->rcdev.ops = &sunxi_usb_reset_ops;
0161     reset_data->rcdev.of_node = node;
0162     reset_controller_register(&reset_data->rcdev);
0163 }
0164
0165 static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
0166     .clk_mask = BIT(8) | BIT(7) | BIT(6),
0167     .reset_mask = BIT(2) | BIT(1) | BIT(0),
0168 };
0169
0170 static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
0171
0172 static void __init sun4i_a10_usb_setup(struct device_node *node)
0173 {
0174     sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
0175 }
0176 CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
0177
0178 static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
0179     .clk_mask = BIT(8) | BIT(6),
0180     .reset_mask = BIT(1) | BIT(0),
0181 };
0182
0183 static void __init sun5i_a13_usb_setup(struct device_node *node)
0184 {
0185     sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
0186 }
0187 CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
0188
0189 static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
0190     .clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
0191     .reset_mask = BIT(2) | BIT(1) | BIT(0),
0192 };
0193
0194 static void __init sun6i_a31_usb_setup(struct device_node *node)
0195 {
0196     sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
0197 }
0198 CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
0199
0200 static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
0201     .clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
0202     .reset_mask = BIT(2) | BIT(1) | BIT(0),
0203 };
0204
0205 static void __init sun8i_a23_usb_setup(struct device_node *node)
0206 {
0207     sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
0208 }
0209 CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
0210
0211 static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
0212     .clk_mask =  BIT(19) | BIT(18) | BIT(17) | BIT(16) |
0213              BIT(11) | BIT(10) | BIT(9) | BIT(8),
0214     .reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
0215 };
0216
0217 static void __init sun8i_h3_usb_setup(struct device_node *node)
0218 {
0219     sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
0220 }
0221 CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
0222
0223 static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
0224     .clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
0225     .reset_mask = BIT(19) | BIT(18) | BIT(17),
0226     .reset_needs_clk = 1,
0227 };
0228
0229 static DEFINE_SPINLOCK(a80_usb_mod_lock);
0230
0231 static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
0232 {
0233     sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
0234 }
0235 CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
0236
0237 static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
0238     .clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
0239     .reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
0240     .reset_needs_clk = 1,
0241 };
0242
0243 static DEFINE_SPINLOCK(a80_usb_phy_lock);
0244
0245 static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
0246 {
0247     sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
0248 }
0249 CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);