1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and 4 * Versatile PB boards. 5 * Copyright (C) 2012 Linus Walleij 6 */ 7 #include <linux/clk-provider.h> 8 #include <linux/err.h> 9 #include <linux/of.h> 10 #include <linux/of_address.h> 11 12 #include "icst.h" 13 #include "clk-icst.h" 14 15 #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 16 17 #define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c 18 #define VERSATILE_SYS_LOCK_OFFSET 0x20 19 20 /* Base offset for the core module */ 21 static void __iomem *cm_base; 22 23 static const struct icst_params cp_auxosc_params = { 24 .vco_max = ICST525_VCO_MAX_5V, 25 .vco_min = ICST525_VCO_MIN, 26 .vd_min = 8, 27 .vd_max = 263, 28 .rd_min = 3, 29 .rd_max = 65, 30 .s2div = icst525_s2div, 31 .idx2s = icst525_idx2s, 32 }; 33 34 static const struct clk_icst_desc cm_auxosc_desc __initconst = { 35 .params = &cp_auxosc_params, 36 .vco_offset = 0x1c, 37 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET, 38 }; 39 40 static const struct icst_params versatile_auxosc_params = { 41 .vco_max = ICST307_VCO_MAX, 42 .vco_min = ICST307_VCO_MIN, 43 .vd_min = 4 + 8, 44 .vd_max = 511 + 8, 45 .rd_min = 1 + 2, 46 .rd_max = 127 + 2, 47 .s2div = icst307_s2div, 48 .idx2s = icst307_idx2s, 49 }; 50 51 static const struct clk_icst_desc versatile_auxosc_desc __initconst = { 52 .params = &versatile_auxosc_params, 53 .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET, 54 .lock_offset = VERSATILE_SYS_LOCK_OFFSET, 55 }; 56 static void __init cm_osc_setup(struct device_node *np, 57 const struct clk_icst_desc *desc) 58 { 59 struct clk *clk = ERR_PTR(-EINVAL); 60 const char *clk_name = np->name; 61 const char *parent_name; 62 63 if (!cm_base) { 64 /* Remap the core module base if not done yet */ 65 struct device_node *parent; 66 67 parent = of_get_parent(np); 68 if (!parent) { 69 pr_err("no parent on core module clock\n"); 70 return; 71 } 72 cm_base = of_iomap(parent, 0); 73 of_node_put(parent); 74 if (!cm_base) { 75 pr_err("could not remap core module base\n"); 76 return; 77 } 78 } 79 80 parent_name = of_clk_get_parent_name(np, 0); 81 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base); 82 if (!IS_ERR(clk)) 83 of_clk_add_provider(np, of_clk_src_simple_get, clk); 84 } 85 86 static void __init of_integrator_cm_osc_setup(struct device_node *np) 87 { 88 cm_osc_setup(np, &cm_auxosc_desc); 89 } 90 CLK_OF_DECLARE(integrator_cm_auxosc_clk, 91 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup); 92 93 static void __init of_versatile_cm_osc_setup(struct device_node *np) 94 { 95 cm_osc_setup(np, &versatile_auxosc_desc); 96 } 97 CLK_OF_DECLARE(versatile_cm_auxosc_clk, 98 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup); 99