1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * OMAP interface clock support 4 * 5 * Copyright (C) 2013 Texas Instruments, Inc. 6 * 7 * Tero Kristo <t-kristo@ti.com> 8 */ 9 10 #include <linux/clk-provider.h> 11 #include <linux/slab.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 #include <linux/clk/ti.h> 15 #include "clock.h" 16 17 #undef pr_fmt 18 #define pr_fmt(fmt) "%s: " fmt, __func__ 19 20 static const struct clk_ops ti_interface_clk_ops = { 21 .init = &omap2_init_clk_clkdm, 22 .enable = &omap2_dflt_clk_enable, 23 .disable = &omap2_dflt_clk_disable, 24 .is_enabled = &omap2_dflt_clk_is_enabled, 25 }; 26 27 static struct clk *_register_interface(struct device *dev, const char *name, 28 const char *parent_name, 29 struct clk_omap_reg *reg, u8 bit_idx, 30 const struct clk_hw_omap_ops *ops) 31 { 32 struct clk_init_data init = { NULL }; 33 struct clk_hw_omap *clk_hw; 34 struct clk *clk; 35 36 clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); 37 if (!clk_hw) 38 return ERR_PTR(-ENOMEM); 39 40 clk_hw->hw.init = &init; 41 clk_hw->ops = ops; 42 memcpy(&clk_hw->enable_reg, reg, sizeof(*reg)); 43 clk_hw->enable_bit = bit_idx; 44 45 init.name = name; 46 init.ops = &ti_interface_clk_ops; 47 init.flags = 0; 48 49 init.num_parents = 1; 50 init.parent_names = &parent_name; 51 52 clk = ti_clk_register_omap_hw(NULL, &clk_hw->hw, name); 53 54 if (IS_ERR(clk)) 55 kfree(clk_hw); 56 57 return clk; 58 } 59 60 static void __init _of_ti_interface_clk_setup(struct device_node *node, 61 const struct clk_hw_omap_ops *ops) 62 { 63 struct clk *clk; 64 const char *parent_name; 65 struct clk_omap_reg reg; 66 u8 enable_bit = 0; 67 const char *name; 68 u32 val; 69 70 if (ti_clk_get_reg_addr(node, 0, ®)) 71 return; 72 73 if (!of_property_read_u32(node, "ti,bit-shift", &val)) 74 enable_bit = val; 75 76 parent_name = of_clk_get_parent_name(node, 0); 77 if (!parent_name) { 78 pr_err("%pOFn must have a parent\n", node); 79 return; 80 } 81 82 name = ti_dt_clk_name(node); 83 clk = _register_interface(NULL, name, parent_name, ®, 84 enable_bit, ops); 85 86 if (!IS_ERR(clk)) 87 of_clk_add_provider(node, of_clk_src_simple_get, clk); 88 } 89 90 static void __init of_ti_interface_clk_setup(struct device_node *node) 91 { 92 _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait); 93 } 94 CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock", 95 of_ti_interface_clk_setup); 96 97 static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node) 98 { 99 _of_ti_interface_clk_setup(node, &clkhwops_iclk); 100 } 101 CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock", 102 of_ti_no_wait_interface_clk_setup); 103 104 #ifdef CONFIG_ARCH_OMAP3 105 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node) 106 { 107 _of_ti_interface_clk_setup(node, 108 &clkhwops_omap3430es2_iclk_hsotgusb_wait); 109 } 110 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock", 111 of_ti_hsotgusb_interface_clk_setup); 112 113 static void __init of_ti_dss_interface_clk_setup(struct device_node *node) 114 { 115 _of_ti_interface_clk_setup(node, 116 &clkhwops_omap3430es2_iclk_dss_usbhost_wait); 117 } 118 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock", 119 of_ti_dss_interface_clk_setup); 120 121 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node) 122 { 123 _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait); 124 } 125 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock", 126 of_ti_ssi_interface_clk_setup); 127 128 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node) 129 { 130 _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait); 131 } 132 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock", 133 of_ti_am35xx_interface_clk_setup); 134 #endif 135 136 #ifdef CONFIG_SOC_OMAP2430 137 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node) 138 { 139 _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait); 140 } 141 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock", 142 of_ti_omap2430_interface_clk_setup); 143 #endif 144