drivers/clk/ti/interface.c

   1 /*
   2  * OMAP interface clock support
   3  *
   4  * Copyright (C) 2013 Texas Instruments, Inc.
   5  *
   6  * Tero Kristo <t-kristo@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/clk-provider.h>
  19 #include <linux/slab.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/clk/ti.h>
  23 #include "clock.h"
  24
  25 #undef pr_fmt
  26 #define pr_fmt(fmt) "%s: " fmt, __func__
  27
  28 static const struct clk_ops ti_interface_clk_ops = {
  29         .init           = &omap2_init_clk_clkdm,
  30         .enable         = &omap2_dflt_clk_enable,
  31         .disable        = &omap2_dflt_clk_disable,
  32         .is_enabled     = &omap2_dflt_clk_is_enabled,
  33 };
  34
  35 static struct clk *_register_interface(struct device *dev, const char *name,
  36                                        const char *parent_name,
  37                                        struct clk_omap_reg *reg, u8 bit_idx,
  38                                        const struct clk_hw_omap_ops *ops)
  39 {
  40         struct clk_init_data init = { NULL };
  41         struct clk_hw_omap *clk_hw;
  42         struct clk *clk;
  43
  44         clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
  45         if (!clk_hw)
  46                 return ERR_PTR(-ENOMEM);
  47
  48         clk_hw->hw.init = &init;
  49         clk_hw->ops = ops;
  50         memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
  51         clk_hw->enable_bit = bit_idx;
  52
  53         init.name = name;
  54         init.ops = &ti_interface_clk_ops;
  55         init.flags = 0;
  56
  57         init.num_parents = 1;
  58         init.parent_names = &parent_name;
  59
  60         clk = ti_clk_register(NULL, &clk_hw->hw, name);
  61
  62         if (IS_ERR(clk))
  63                 kfree(clk_hw);
  64         else
  65                 omap2_init_clk_hw_omap_clocks(&clk_hw->hw);
  66
  67         return clk;
  68 }
  69
  70 static void __init _of_ti_interface_clk_setup(struct device_node *node,
  71                                               const struct clk_hw_omap_ops *ops)
  72 {
  73         struct clk *clk;
  74         const char *parent_name;
  75         struct clk_omap_reg reg;
  76         u8 enable_bit = 0;
  77         u32 val;
  78
  79         if (ti_clk_get_reg_addr(node, 0, &reg))
  80                 return;
  81
  82         if (!of_property_read_u32(node, "ti,bit-shift", &val))
  83                 enable_bit = val;
  84
  85         parent_name = of_clk_get_parent_name(node, 0);
  86         if (!parent_name) {
  87                 pr_err("%s must have a parent\n", node->name);
  88                 return;
  89         }
  90
  91         clk = _register_interface(NULL, node->name, parent_name, &reg,
  92                                   enable_bit, ops);
  93
  94         if (!IS_ERR(clk))
  95                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  96 }
  97
  98 static void __init of_ti_interface_clk_setup(struct device_node *node)
  99 {
 100         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
 101 }
 102 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
 103                of_ti_interface_clk_setup);
 104
 105 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
 106 {
 107         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 108 }
 109 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 110                of_ti_no_wait_interface_clk_setup);
 111
 112 #ifdef CONFIG_ARCH_OMAP3
 113 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 114 {
 115         _of_ti_interface_clk_setup(node,
 116                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 117 }
 118 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 119                of_ti_hsotgusb_interface_clk_setup);
 120
 121 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 122 {
 123         _of_ti_interface_clk_setup(node,
 124                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 125 }
 126 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 127                of_ti_dss_interface_clk_setup);
 128
 129 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 130 {
 131         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 132 }
 133 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 134                of_ti_ssi_interface_clk_setup);
 135
 136 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 137 {
 138         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 139 }
 140 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 141                of_ti_am35xx_interface_clk_setup);
 142 #endif
 143
 144 #ifdef CONFIG_SOC_OMAP2430
 145 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 146 {
 147         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 148 }
 149 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 150                of_ti_omap2430_interface_clk_setup);
 151 #endif