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 "icst.h" 16 #include "clk-icst.h" 17 18 #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 19 20 #define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c 21 #define VERSATILE_SYS_LOCK_OFFSET 0x20 22 23 /* Base offset for the core module */ 24 static void __iomem *cm_base; 25 26 static const struct icst_params cp_auxosc_params = { 27 .vco_max = ICST525_VCO_MAX_5V, 28 .vco_min = ICST525_VCO_MIN, 29 .vd_min = 8, 30 .vd_max = 263, 31 .rd_min = 3, 32 .rd_max = 65, 33 .s2div = icst525_s2div, 34 .idx2s = icst525_idx2s, 35 }; 36 37 static const struct clk_icst_desc cm_auxosc_desc __initconst = { 38 .params = &cp_auxosc_params, 39 .vco_offset = 0x1c, 40 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET, 41 }; 42 43 static const struct icst_params versatile_auxosc_params = { 44 .vco_max = ICST307_VCO_MAX, 45 .vco_min = ICST307_VCO_MIN, 46 .vd_min = 4 + 8, 47 .vd_max = 511 + 8, 48 .rd_min = 1 + 2, 49 .rd_max = 127 + 2, 50 .s2div = icst307_s2div, 51 .idx2s = icst307_idx2s, 52 }; 53 54 static const struct clk_icst_desc versatile_auxosc_desc __initconst = { 55 .params = &versatile_auxosc_params, 56 .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET, 57 .lock_offset = VERSATILE_SYS_LOCK_OFFSET, 58 }; 59 static void __init cm_osc_setup(struct device_node *np, 60 const struct clk_icst_desc *desc) 61 { 62 struct clk *clk = ERR_PTR(-EINVAL); 63 const char *clk_name = np->name; 64 const char *parent_name; 65 66 if (!cm_base) { 67 /* Remap the core module base if not done yet */ 68 struct device_node *parent; 69 70 parent = of_get_parent(np); 71 if (!parent) { 72 pr_err("no parent on core module clock\n"); 73 return; 74 } 75 cm_base = of_iomap(parent, 0); 76 if (!cm_base) { 77 pr_err("could not remap core module base\n"); 78 return; 79 } 80 } 81 82 parent_name = of_clk_get_parent_name(np, 0); 83 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base); 84 if (!IS_ERR(clk)) 85 of_clk_add_provider(np, of_clk_src_simple_get, clk); 86 } 87 88 static void __init of_integrator_cm_osc_setup(struct device_node *np) 89 { 90 cm_osc_setup(np, &cm_auxosc_desc); 91 } 92 CLK_OF_DECLARE(integrator_cm_auxosc_clk, 93 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup); 94 95 static void __init of_versatile_cm_osc_setup(struct device_node *np) 96 { 97 cm_osc_setup(np, &versatile_auxosc_desc); 98 } 99 CLK_OF_DECLARE(versatile_cm_auxosc_clk, 100 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup); 101