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
  24 #undef pr_fmt
  25 #define pr_fmt(fmt) "%s: " fmt, __func__
  26
  27 static const struct clk_ops ti_interface_clk_ops = {
  28         .init           = &omap2_init_clk_clkdm,
  29         .enable         = &omap2_dflt_clk_enable,
  30         .disable        = &omap2_dflt_clk_disable,
  31         .is_enabled     = &omap2_dflt_clk_is_enabled,
  32 };
  33
  34 static void __init _of_ti_interface_clk_setup(struct device_node *node,
  35                                               const struct clk_hw_omap_ops *ops)
  36 {
  37         struct clk *clk;
  38         struct clk_init_data init = { NULL };
  39         struct clk_hw_omap *clk_hw;
  40         const char *parent_name;
  41         u32 val;
  42
  43         clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
  44         if (!clk_hw)
  45                 return;
  46
  47         clk_hw->hw.init = &init;
  48         clk_hw->ops = ops;
  49         clk_hw->flags = MEMMAP_ADDRESSING;
  50
  51         clk_hw->enable_reg = ti_clk_get_reg_addr(node, 0);
  52         if (!clk_hw->enable_reg)
  53                 goto cleanup;
  54
  55         if (!of_property_read_u32(node, "ti,bit-shift", &val))
  56                 clk_hw->enable_bit = val;
  57
  58         init.name = node->name;
  59         init.ops = &ti_interface_clk_ops;
  60         init.flags = 0;
  61
  62         parent_name = of_clk_get_parent_name(node, 0);
  63         if (!parent_name) {
  64                 pr_err("%s must have a parent\n", node->name);
  65                 goto cleanup;
  66         }
  67
  68         init.num_parents = 1;
  69         init.parent_names = &parent_name;
  70
  71         clk = clk_register(NULL, &clk_hw->hw);
  72
  73         if (!IS_ERR(clk)) {
  74                 of_clk_add_provider(node, of_clk_src_simple_get, clk);
  75                 omap2_init_clk_hw_omap_clocks(clk);
  76                 return;
  77         }
  78
  79 cleanup:
  80         kfree(clk_hw);
  81 }
  82
  83 static void __init of_ti_interface_clk_setup(struct device_node *node)
  84 {
  85         _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait);
  86 }
  87 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock",
  88                of_ti_interface_clk_setup);
  89
  90 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node)
  91 {
  92         _of_ti_interface_clk_setup(node, &clkhwops_iclk);
  93 }
  94 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock",
  95                of_ti_no_wait_interface_clk_setup);
  96
  97 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node)
  98 {
  99         _of_ti_interface_clk_setup(node,
 100                                    &clkhwops_omap3430es2_iclk_hsotgusb_wait);
 101 }
 102 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock",
 103                of_ti_hsotgusb_interface_clk_setup);
 104
 105 static void __init of_ti_dss_interface_clk_setup(struct device_node *node)
 106 {
 107         _of_ti_interface_clk_setup(node,
 108                                    &clkhwops_omap3430es2_iclk_dss_usbhost_wait);
 109 }
 110 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock",
 111                of_ti_dss_interface_clk_setup);
 112
 113 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node)
 114 {
 115         _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait);
 116 }
 117 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock",
 118                of_ti_ssi_interface_clk_setup);
 119
 120 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node)
 121 {
 122         _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait);
 123 }
 124 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock",
 125                of_ti_am35xx_interface_clk_setup);