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/clk.h> 12 #include <linux/clkdev.h> 13 #include <linux/err.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 17 #include "clk-icst.h" 18 19 #define INTEGRATOR_HDR_LOCK_OFFSET 0x14 20 21 #define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c 22 #define VERSATILE_SYS_LOCK_OFFSET 0x20 23 24 /* Base offset for the core module */ 25 static void __iomem *cm_base; 26 27 static const struct icst_params cp_auxosc_params = { 28 .vco_max = ICST525_VCO_MAX_5V, 29 .vco_min = ICST525_VCO_MIN, 30 .vd_min = 8, 31 .vd_max = 263, 32 .rd_min = 3, 33 .rd_max = 65, 34 .s2div = icst525_s2div, 35 .idx2s = icst525_idx2s, 36 }; 37 38 static const struct clk_icst_desc __initdata cm_auxosc_desc = { 39 .params = &cp_auxosc_params, 40 .vco_offset = 0x1c, 41 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET, 42 }; 43 44 static const struct icst_params versatile_auxosc_params = { 45 .vco_max = ICST307_VCO_MAX, 46 .vco_min = ICST307_VCO_MIN, 47 .vd_min = 4 + 8, 48 .vd_max = 511 + 8, 49 .rd_min = 1 + 2, 50 .rd_max = 127 + 2, 51 .s2div = icst307_s2div, 52 .idx2s = icst307_idx2s, 53 }; 54 55 static const struct clk_icst_desc versatile_auxosc_desc __initconst = { 56 .params = &versatile_auxosc_params, 57 .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET, 58 .lock_offset = VERSATILE_SYS_LOCK_OFFSET, 59 }; 60 static void __init cm_osc_setup(struct device_node *np, 61 const struct clk_icst_desc *desc) 62 { 63 struct clk *clk = ERR_PTR(-EINVAL); 64 const char *clk_name = np->name; 65 const char *parent_name; 66 67 if (!cm_base) { 68 /* Remap the core module base if not done yet */ 69 struct device_node *parent; 70 71 parent = of_get_parent(np); 72 if (!np) { 73 pr_err("no parent on core module clock\n"); 74 return; 75 } 76 cm_base = of_iomap(parent, 0); 77 if (!cm_base) { 78 pr_err("could not remap core module base\n"); 79 return; 80 } 81 } 82 83 parent_name = of_clk_get_parent_name(np, 0); 84 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base); 85 if (!IS_ERR(clk)) 86 of_clk_add_provider(np, of_clk_src_simple_get, clk); 87 } 88 89 static void __init of_integrator_cm_osc_setup(struct device_node *np) 90 { 91 cm_osc_setup(np, &cm_auxosc_desc); 92 } 93 CLK_OF_DECLARE(integrator_cm_auxosc_clk, 94 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup); 95 96 static void __init of_versatile_cm_osc_setup(struct device_node *np) 97 { 98 cm_osc_setup(np, &versatile_auxosc_desc); 99 } 100 CLK_OF_DECLARE(versatile_cm_auxosc_clk, 101 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup); 102