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, ®)) 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, ®, 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 150