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 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
  71 struct clk *ti_clk_register_interface(struct ti_clk *setup)
  72 {
  73         const struct clk_hw_omap_ops *ops = &clkhwops_iclk_wait;
  74         struct clk_omap_reg reg;
  75         struct ti_clk_gate *gate;
  76
  77         gate = setup->data;
  78         reg.index = gate->module;
  79         reg.offset = gate->reg;
  80         reg.ptr = NULL;
  81
  82         if (gate->flags & CLKF_NO_WAIT)
  83                 ops = &clkhwops_iclk;
  84
  85         if (gate->flags & CLKF_HSOTGUSB)
  86                 ops = &clkhwops_omap3430es2_iclk_hsotgusb_wait;
  87
  88         if (gate->flags & CLKF_DSS)
  89                 ops = &clkhwops_omap3430es2_iclk_dss_usbhost_wait;
  90
  91         if (gate->flags & CLKF_SSI)
  92                 ops = &clkhwops_omap3430es2_iclk_ssi_wait;
  93
  94         if (gate->flags & CLKF_AM35XX)
  95                 ops = &clkhwops_am35xx_ipss_wait;
  96
  97         return _register_interface(NULL, setup->name, gate->parent,
  98                                    &reg, gate->bit_shift, ops);
  99 }
 100 #endif
 101
 102 static void __init _of_ti_interface_clk_setup(struct device_node *node,
 103                                               const struct clk_hw_omap_ops *ops)
 104 {
 105         struct clk *clk;
 106         const char *parent_name;
 107         struct clk_omap_reg reg;
 108         u8 enable_bit = 0;
 109         u32 val;
 110
 111         if (ti_clk_get_reg_addr(node, 0, &reg))
 112                 return;
 113
 114         if (!of_property_read_u32(node, "ti,bit-shift", &val))
 115                 enable_bit = val;
 116
 117         parent_name = of_clk_get_parent_name(node, 0);
 118         if (!parent_name) {
 119                 pr_err("%s must have a parent\n", node->name);
 120                 return;
 121         }
 122
 123         clk = _register_interface(NULL, node->name, parent_name, &reg,
 124                                   enable_bit, ops);
 125
 126         if (!IS_ERR(clk))
 127                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
 128 }
 129
 130 static void __init of_ti_interface_clk_setup(struct device_node *node)
 131 {
 132         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
 133 }
 134 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
 135                of_ti_interface_clk_setup);
 136
 137 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
 138 {
 139         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 140 }
 141 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 142                of_ti_no_wait_interface_clk_setup);
 143
 144 #ifdef CONFIG_ARCH_OMAP3
 145 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 146 {
 147         _of_ti_interface_clk_setup(node,
 148                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 149 }
 150 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 151                of_ti_hsotgusb_interface_clk_setup);
 152
 153 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 154 {
 155         _of_ti_interface_clk_setup(node,
 156                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 157 }
 158 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 159                of_ti_dss_interface_clk_setup);
 160
 161 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 162 {
 163         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 164 }
 165 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 166                of_ti_ssi_interface_clk_setup);
 167
 168 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 169 {
 170         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 171 }
 172 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 173                of_ti_am35xx_interface_clk_setup);
 174 #endif
 175
 176 #ifdef CONFIG_SOC_OMAP2430
 177 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 178 {
 179         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 180 }
 181 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 182                of_ti_omap2430_interface_clk_setup);
 183 #endif