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_omap_hw(NULL, &clk_hw->hw, name);
  61
  62         if (IS_ERR(clk))
  63                 kfree(clk_hw);
  64
  65         return clk;
  66 }
  67
  68 static void __init _of_ti_interface_clk_setup(struct device_node *node,
  69                                               const struct clk_hw_omap_ops *ops)
  70 {
  71         struct clk *clk;
  72         const char *parent_name;
  73         struct clk_omap_reg reg;
  74         u8 enable_bit = 0;
  75         u32 val;
  76
  77         if (ti_clk_get_reg_addr(node, 0, &reg))
  78                 return;
  79
  80         if (!of_property_read_u32(node, "ti,bit-shift", &val))
  81                 enable_bit = val;
  82
  83         parent_name = of_clk_get_parent_name(node, 0);
  84         if (!parent_name) {
  85                 pr_err("%pOFn must have a parent\n", node);
  86                 return;
  87         }
  88
  89         clk = _register_interface(NULL, node->name, parent_name, &reg,
  90                                   enable_bit, ops);
  91
  92         if (!IS_ERR(clk))
  93                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  94 }
  95
  96 static void __init of_ti_interface_clk_setup(struct device_node *node)
  97 {
  98         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
  99 }
 100 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
 101                of_ti_interface_clk_setup);
 102
 103 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
 104 {
 105         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 106 }
 107 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 108                of_ti_no_wait_interface_clk_setup);
 109
 110 #ifdef CONFIG_ARCH_OMAP3
 111 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 112 {
 113         _of_ti_interface_clk_setup(node,
 114                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 115 }
 116 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 117                of_ti_hsotgusb_interface_clk_setup);
 118
 119 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 120 {
 121         _of_ti_interface_clk_setup(node,
 122                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 123 }
 124 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 125                of_ti_dss_interface_clk_setup);
 126
 127 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 128 {
 129         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 130 }
 131 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 132                of_ti_ssi_interface_clk_setup);
 133
 134 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 135 {
 136         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 137 }
 138 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 139                of_ti_am35xx_interface_clk_setup);
 140 #endif
 141
 142 #ifdef CONFIG_SOC_OMAP2430
 143 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 144 {
 145         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 146 }
 147 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 148                of_ti_omap2430_interface_clk_setup);
 149 #endif