drivers/clk/ti/interface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * OMAP interface clock support
   4  *
   5  * Copyright (C) 2013 Texas Instruments, Inc.
   6  *
   7  * Tero Kristo <t-kristo@ti.com>
   8  */
   9
  10 #include <linux/clk-provider.h>
  11 #include <linux/slab.h>
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14 #include <linux/clk/ti.h>
  15 #include "clock.h"
  16
  17 #undef pr_fmt
  18 #define pr_fmt(fmt) "%s: " fmt, __func__
  19
  20 static const struct clk_ops ti_interface_clk_ops = {
  21         .init           = &omap2_init_clk_clkdm,
  22         .enable         = &omap2_dflt_clk_enable,
  23         .disable        = &omap2_dflt_clk_disable,
  24         .is_enabled     = &omap2_dflt_clk_is_enabled,
  25 };
  26
  27 static struct clk *_register_interface(struct device_node *node,
  28                                        const char *name,
  29                                        const char *parent_name,
  30                                        struct clk_omap_reg *reg, u8 bit_idx,
  31                                        const struct clk_hw_omap_ops *ops)
  32 {
  33         struct clk_init_data init = { NULL };
  34         struct clk_hw_omap *clk_hw;
  35         struct clk *clk;
  36
  37         clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
  38         if (!clk_hw)
  39                 return ERR_PTR(-ENOMEM);
  40
  41         clk_hw->hw.init = &init;
  42         clk_hw->ops = ops;
  43         memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
  44         clk_hw->enable_bit = bit_idx;
  45
  46         init.name = name;
  47         init.ops = &ti_interface_clk_ops;
  48         init.flags = 0;
  49
  50         init.num_parents = 1;
  51         init.parent_names = &parent_name;
  52
  53         clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);
  54
  55         if (IS_ERR(clk))
  56                 kfree(clk_hw);
  57
  58         return clk;
  59 }
  60
  61 static void __init _of_ti_interface_clk_setup(struct device_node *node,
  62                                               const struct clk_hw_omap_ops *ops)
  63 {
  64         struct clk *clk;
  65         const char *parent_name;
  66         struct clk_omap_reg reg;
  67         u8 enable_bit = 0;
  68         const char *name;
  69         u32 val;
  70
  71         if (ti_clk_get_reg_addr(node, 0, &reg))
  72                 return;
  73
  74         if (!of_property_read_u32(node, "ti,bit-shift", &val))
  75                 enable_bit = val;
  76
  77         parent_name = of_clk_get_parent_name(node, 0);
  78         if (!parent_name) {
  79                 pr_err("%pOFn must have a parent\n", node);
  80                 return;
  81         }
  82
  83         name = ti_dt_clk_name(node);
  84         clk = _register_interface(node, name, parent_name, &reg,
  85                                   enable_bit, ops);
  86
  87         if (!IS_ERR(clk))
  88                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  89 }
  90
  91 static void __init of_ti_interface_clk_setup(struct device_node *node)
  92 {
  93         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
  94 }
  95 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
  96                of_ti_interface_clk_setup);
  97
  98 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
  99 {
 100         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 101 }
 102 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 103                of_ti_no_wait_interface_clk_setup);
 104
 105 #ifdef CONFIG_ARCH_OMAP3
 106 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 107 {
 108         _of_ti_interface_clk_setup(node,
 109                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 110 }
 111 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 112                of_ti_hsotgusb_interface_clk_setup);
 113
 114 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 115 {
 116         _of_ti_interface_clk_setup(node,
 117                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 118 }
 119 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 120                of_ti_dss_interface_clk_setup);
 121
 122 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 123 {
 124         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 125 }
 126 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 127                of_ti_ssi_interface_clk_setup);
 128
 129 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 130 {
 131         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 132 }
 133 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 134                of_ti_am35xx_interface_clk_setup);
 135 #endif
 136
 137 #ifdef CONFIG_SOC_OMAP2430
 138 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 139 {
 140         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 141 }
 142 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 143                of_ti_omap2430_interface_clk_setup);
 144 #endif