clk/versatile/clk-versatile.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
0004  * Versatile PB boards.
0005  * Copyright (C) 2012 Linus Walleij
0006  */
0007 #include <linux/clk-provider.h>
0008 #include <linux/err.h>
0009 #include <linux/of.h>
0010 #include <linux/of_address.h>
0011
0012 #include "icst.h"
0013 #include "clk-icst.h"
0014
0015 #define INTEGRATOR_HDR_LOCK_OFFSET  0x14
0016
0017 #define VERSATILE_SYS_OSCCLCD_OFFSET    0x1c
0018 #define VERSATILE_SYS_LOCK_OFFSET   0x20
0019
0020 /* Base offset for the core module */
0021 static void __iomem *cm_base;
0022
0023 static const struct icst_params cp_auxosc_params = {
0024     .vco_max    = ICST525_VCO_MAX_5V,
0025     .vco_min    = ICST525_VCO_MIN,
0026     .vd_min     = 8,
0027     .vd_max     = 263,
0028     .rd_min     = 3,
0029     .rd_max     = 65,
0030     .s2div      = icst525_s2div,
0031     .idx2s      = icst525_idx2s,
0032 };
0033
0034 static const struct clk_icst_desc cm_auxosc_desc __initconst = {
0035     .params = &cp_auxosc_params,
0036     .vco_offset = 0x1c,
0037     .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
0038 };
0039
0040 static const struct icst_params versatile_auxosc_params = {
0041     .vco_max    = ICST307_VCO_MAX,
0042     .vco_min    = ICST307_VCO_MIN,
0043     .vd_min     = 4 + 8,
0044     .vd_max     = 511 + 8,
0045     .rd_min     = 1 + 2,
0046     .rd_max     = 127 + 2,
0047     .s2div      = icst307_s2div,
0048     .idx2s      = icst307_idx2s,
0049 };
0050
0051 static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
0052     .params = &versatile_auxosc_params,
0053     .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
0054     .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
0055 };
0056 static void __init cm_osc_setup(struct device_node *np,
0057                 const struct clk_icst_desc *desc)
0058 {
0059     struct clk *clk;
0060     const char *clk_name = np->name;
0061     const char *parent_name;
0062
0063     if (!cm_base) {
0064         /* Remap the core module base if not done yet */
0065         struct device_node *parent;
0066
0067         parent = of_get_parent(np);
0068         if (!parent) {
0069             pr_err("no parent on core module clock\n");
0070             return;
0071         }
0072         cm_base = of_iomap(parent, 0);
0073         of_node_put(parent);
0074         if (!cm_base) {
0075             pr_err("could not remap core module base\n");
0076             return;
0077         }
0078     }
0079
0080     parent_name = of_clk_get_parent_name(np, 0);
0081     clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
0082     if (!IS_ERR(clk))
0083         of_clk_add_provider(np, of_clk_src_simple_get, clk);
0084 }
0085
0086 static void __init of_integrator_cm_osc_setup(struct device_node *np)
0087 {
0088     cm_osc_setup(np, &cm_auxosc_desc);
0089 }
0090 CLK_OF_DECLARE(integrator_cm_auxosc_clk,
0091     "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
0092
0093 static void __init of_versatile_cm_osc_setup(struct device_node *np)
0094 {
0095     cm_osc_setup(np, &versatile_auxosc_desc);
0096 }
0097 CLK_OF_DECLARE(versatile_cm_auxosc_clk,
0098            "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);