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 #ifdef CONFIG_ARCH_OMAP3 98 static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node) 99 { 100 _of_ti_interface_clk_setup(node, 101 &clkhwops_omap3430es2_iclk_hsotgusb_wait); 102 } 103 CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock", 104 of_ti_hsotgusb_interface_clk_setup); 105 106 static void __init of_ti_dss_interface_clk_setup(struct device_node *node) 107 { 108 _of_ti_interface_clk_setup(node, 109 &clkhwops_omap3430es2_iclk_dss_usbhost_wait); 110 } 111 CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock", 112 of_ti_dss_interface_clk_setup); 113 114 static void __init of_ti_ssi_interface_clk_setup(struct device_node *node) 115 { 116 _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait); 117 } 118 CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock", 119 of_ti_ssi_interface_clk_setup); 120 121 static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node) 122 { 123 _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait); 124 } 125 CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock", 126 of_ti_am35xx_interface_clk_setup); 127 #endif 128 129 #ifdef CONFIG_SOC_OMAP2430 130 static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node) 131 { 132 _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait); 133 } 134 CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock", 135 of_ti_omap2430_interface_clk_setup); 136 #endif 137