kernel/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                                        void __iomem *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         clk_hw->flags = MEMMAP_ADDRESSING;
  51         clk_hw->enable_reg = reg;
  52         clk_hw->enable_bit = bit_idx;
  53
  54         init.name = name;
  55         init.ops = &ti_interface_clk_ops;
  56         init.flags = 0;
  57
  58         init.num_parents = 1;
  59         init.parent_names = &parent_name;
  60
  61         clk = clk_register(NULL, &clk_hw->hw);
  62
  63         if (IS_ERR(clk))
  64                 kfree(clk_hw);
  65         else
  66                 omap2_init_clk_hw_omap_clocks(clk);
  67
  68         return clk;
  69 }
  70
  71 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
  72 struct clk *ti_clk_register_interface(struct ti_clk *setup)
  73 {
  74         const struct clk_hw_omap_ops *ops = &clkhwops_iclk_wait;
  75         u32 reg;
  76         struct clk_omap_reg *reg_setup;
  77         struct ti_clk_gate *gate;
  78
  79         gate = setup->data;
  80         reg_setup = (struct clk_omap_reg *)&reg;
  81         reg_setup->index = gate->module;
  82         reg_setup->offset = gate->reg;
  83
  84         if (gate->flags & CLKF_NO_WAIT)
  85                 ops = &clkhwops_iclk;
  86
  87         if (gate->flags & CLKF_HSOTGUSB)
  88                 ops = &clkhwops_omap3430es2_iclk_hsotgusb_wait;
  89
  90         if (gate->flags & CLKF_DSS)
  91                 ops = &clkhwops_omap3430es2_iclk_dss_usbhost_wait;
  92
  93         if (gate->flags & CLKF_SSI)
  94                 ops = &clkhwops_omap3430es2_iclk_ssi_wait;
  95
  96         if (gate->flags & CLKF_AM35XX)
  97                 ops = &clkhwops_am35xx_ipss_wait;
  98
  99         return _register_interface(NULL, setup->name, gate->parent,
 100                                    (void __iomem *)reg, gate->bit_shift, ops);
 101 }
 102 #endif
 103
 104 static void __init _of_ti_interface_clk_setup(struct device_node *node,
 105                                               const struct clk_hw_omap_ops *ops)
 106 {
 107         struct clk *clk;
 108         const char *parent_name;
 109         void __iomem *reg;
 110         u8 enable_bit = 0;
 111         u32 val;
 112
 113         reg = ti_clk_get_reg_addr(node, 0);
 114         if (IS_ERR(reg))
 115                 return;
 116
 117         if (!of_property_read_u32(node, "ti,bit-shift", &val))
 118                 enable_bit = val;
 119
 120         parent_name = of_clk_get_parent_name(node, 0);
 121         if (!parent_name) {
 122                 pr_err("%s must have a parent\n", node->name);
 123                 return;
 124         }
 125
 126         clk = _register_interface(NULL, node->name, parent_name, reg,
 127                                   enable_bit, ops);
 128
 129         if (!IS_ERR(clk))
 130                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
 131 }
 132
 133 static void __init of_ti_interface_clk_setup(struct device_node *node)
 134 {
 135         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
 136 }
 137 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
 138                of_ti_interface_clk_setup);
 139
 140 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
 141 {
 142         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
 143 }
 144 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
 145                of_ti_no_wait_interface_clk_setup);
 146
 147 #ifdef CONFIG_ARCH_OMAP3
 148 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
 149 {
 150         _of_ti_interface_clk_setup(node,
 151                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 152 }
 153 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 154                of_ti_hsotgusb_interface_clk_setup);
 155
 156 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 157 {
 158         _of_ti_interface_clk_setup(node,
 159                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 160 }
 161 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 162                of_ti_dss_interface_clk_setup);
 163
 164 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 165 {
 166         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 167 }
 168 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 169                of_ti_ssi_interface_clk_setup);
 170
 171 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 172 {
 173         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 174 }
 175 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 176                of_ti_am35xx_interface_clk_setup);
 177 #endif
 178
 179 #ifdef CONFIG_SOC_OMAP2430
 180 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node)
 181 {
 182         _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait);
 183 }
 184 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock",
 185                of_ti_omap2430_interface_clk_setup);
 186 #endif