1 /* 2 * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and 3 * Versatile PB boards. 4 * Copyright (C) 2012 Linus Walleij 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/clk-provider.h> 11 #include <linux/err.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 15 #include "clk-icst.h" 16 17 #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 18 19 #define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c 20 #define VERSATILE_SYS_LOCK_OFFSET 0x20 21 22 /* Base offset for the core module */ 23 static void __iomem *cm_base; 24 25 static const struct icst_params cp_auxosc_params = { 26 .vco_max = ICST525_VCO_MAX_5V, 27 .vco_min = ICST525_VCO_MIN, 28 .vd_min = 8, 29 .vd_max = 263, 30 .rd_min = 3, 31 .rd_max = 65, 32 .s2div = icst525_s2div, 33 .idx2s = icst525_idx2s, 34 }; 35 36 static const struct clk_icst_desc cm_auxosc_desc __initconst = { 37 .params = &cp_auxosc_params, 38 .vco_offset = 0x1c, 39 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET, 40 }; 41 42 static const struct icst_params versatile_auxosc_params = { 43 .vco_max = ICST307_VCO_MAX, 44 .vco_min = ICST307_VCO_MIN, 45 .vd_min = 4 + 8, 46 .vd_max = 511 + 8, 47 .rd_min = 1 + 2, 48 .rd_max = 127 + 2, 49 .s2div = icst307_s2div, 50 .idx2s = icst307_idx2s, 51 }; 52 53 static const struct clk_icst_desc versatile_auxosc_desc __initconst = { 54 .params = &versatile_auxosc_params, 55 .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET, 56 .lock_offset = VERSATILE_SYS_LOCK_OFFSET, 57 }; 58 static void __init cm_osc_setup(struct device_node *np, 59 const struct clk_icst_desc *desc) 60 { 61 struct clk *clk = ERR_PTR(-EINVAL); 62 const char *clk_name = np->name; 63 const char *parent_name; 64 65 if (!cm_base) { 66 /* Remap the core module base if not done yet */ 67 struct device_node *parent; 68 69 parent = of_get_parent(np); 70 if (!parent) { 71 pr_err("no parent on core module clock\n"); 72 return; 73 } 74 cm_base = of_iomap(parent, 0); 75 if (!cm_base) { 76 pr_err("could not remap core module base\n"); 77 return; 78 } 79 } 80 81 parent_name = of_clk_get_parent_name(np, 0); 82 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base); 83 if (!IS_ERR(clk)) 84 of_clk_add_provider(np, of_clk_src_simple_get, clk); 85 } 86 87 static void __init of_integrator_cm_osc_setup(struct device_node *np) 88 { 89 cm_osc_setup(np, &cm_auxosc_desc); 90 } 91 CLK_OF_DECLARE(integrator_cm_auxosc_clk, 92 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup); 93 94 static void __init of_versatile_cm_osc_setup(struct device_node *np) 95 { 96 cm_osc_setup(np, &versatile_auxosc_desc); 97 } 98 CLK_OF_DECLARE(versatile_cm_auxosc_clk, 99 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup); 100