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 <[email protected]>
   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 *dev, const char *name,
  28                                        const char *parent_name,
  29                                        struct clk_omap_reg *reg, u8 bit_idx,
  30                                        const struct clk_hw_omap_ops *ops)
  31 {
  32         struct clk_init_data init = { NULL };
  33         struct clk_hw_omap *clk_hw;
  34         struct clk *clk;
  35
  36         clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
  37         if (!clk_hw)
  38                 return ERR_PTR(-ENOMEM);
  39
  40         clk_hw->hw.init = &init;
  41         clk_hw->ops = ops;
  42         memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
  43         clk_hw->enable_bit = bit_idx;
  44
  45         init.name = name;
  46         init.ops = &ti_interface_clk_ops;
  47         init.flags = 0;
  48
  49         init.num_parents = 1;
  50         init.parent_names = &parent_name;
  51
  52         clk = ti_clk_register_omap_hw(NULL, &clk_hw->hw, name);
  53
  54         if (IS_ERR(clk))
  55                 kfree(clk_hw);
  56
  57         return clk;
  58 }
  59
  60 static void __init _of_ti_interface_clk_setup(struct device_node *node,
  61                                               const struct clk_hw_omap_ops *ops)
  62 {
  63         struct clk *clk;
  64         const char *parent_name;
  65         struct clk_omap_reg reg;
  66         u8 enable_bit = 0;
  67         const char *name;
  68         u32 val;
  69
  70         if (ti_clk_get_reg_addr(node, 0, &reg))
  71                 return;
  72
  73         if (!of_property_read_u32(node, "ti,bit-shift", &val))
  74                 enable_bit = val;
  75
  76         parent_name = of_clk_get_parent_name(node, 0);
  77         if (!parent_name) {
  78                 pr_err("%pOFn must have a parent\n", node);
  79                 return;
  80         }
  81
  82         name = ti_dt_clk_name(node);
  83         clk = _register_interface(NULL, name, parent_name, &reg,
  84                                   enable_bit, ops);
  85
  86         if (!IS_ERR(clk))
  87                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  88 }
  89
  90 static void __init of_ti_interface_clk_setup(struct device_node *node)
  91 {
  92         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
  93 }
  94 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
  95                of_ti_interface_clk_setup);
  96
  97 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
  98 {
  99         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 100 }
 101 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 102                of_ti_no_wait_interface_clk_setup);
 103
 104 #ifdef CONFIG_ARCH_OMAP3
 105 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 106 {
 107         _of_ti_interface_clk_setup(node,
 108                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 109 }
 110 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 111                of_ti_hsotgusb_interface_clk_setup);
 112
 113 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 114 {
 115         _of_ti_interface_clk_setup(node,
 116                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 117 }
 118 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 119                of_ti_dss_interface_clk_setup);
 120
 121 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 122 {
 123         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 124 }
 125 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 126                of_ti_ssi_interface_clk_setup);
 127
 128 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 129 {
 130         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 131 }
 132 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 133                of_ti_am35xx_interface_clk_setup);
 134 #endif
 135
 136 #ifdef CONFIG_SOC_OMAP2430
 137 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 138 {
 139         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 140 }
 141 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 142                of_ti_omap2430_interface_clk_setup);
 143 #endif