170ee6577SLinus Walleij /* 270ee6577SLinus Walleij * Clock driver for the ARM Integrator/IM-PD1 board 370ee6577SLinus Walleij * Copyright (C) 2012 Linus Walleij 470ee6577SLinus Walleij * 570ee6577SLinus Walleij * This program is free software; you can redistribute it and/or modify 670ee6577SLinus Walleij * it under the terms of the GNU General Public License version 2 as 770ee6577SLinus Walleij * published by the Free Software Foundation. 870ee6577SLinus Walleij */ 970ee6577SLinus Walleij #include <linux/clk-provider.h> 1070ee6577SLinus Walleij #include <linux/clk.h> 1170ee6577SLinus Walleij #include <linux/clkdev.h> 1270ee6577SLinus Walleij #include <linux/err.h> 1370ee6577SLinus Walleij #include <linux/io.h> 1470ee6577SLinus Walleij #include <linux/platform_data/clk-integrator.h> 1570ee6577SLinus Walleij 1670ee6577SLinus Walleij #include <mach/impd1.h> 1770ee6577SLinus Walleij 1870ee6577SLinus Walleij #include "clk-icst.h" 1970ee6577SLinus Walleij 2070ee6577SLinus Walleij struct impd1_clk { 2170ee6577SLinus Walleij struct clk *vcoclk; 2270ee6577SLinus Walleij struct clk *uartclk; 2370ee6577SLinus Walleij struct clk_lookup *clks[3]; 2470ee6577SLinus Walleij }; 2570ee6577SLinus Walleij 2670ee6577SLinus Walleij static struct impd1_clk impd1_clks[4]; 2770ee6577SLinus Walleij 2870ee6577SLinus Walleij /* 2970ee6577SLinus Walleij * There are two VCO's on the IM-PD1 but only one is used by the 3070ee6577SLinus Walleij * kernel, that is why we are only implementing the control of 3170ee6577SLinus Walleij * IMPD1_OSC1 here. 3270ee6577SLinus Walleij */ 3370ee6577SLinus Walleij 3470ee6577SLinus Walleij static const struct icst_params impd1_vco_params = { 3570ee6577SLinus Walleij .ref = 24000000, /* 24 MHz */ 3670ee6577SLinus Walleij .vco_max = ICST525_VCO_MAX_3V, 3770ee6577SLinus Walleij .vco_min = ICST525_VCO_MIN, 3870ee6577SLinus Walleij .vd_min = 12, 3970ee6577SLinus Walleij .vd_max = 519, 4070ee6577SLinus Walleij .rd_min = 3, 4170ee6577SLinus Walleij .rd_max = 120, 4270ee6577SLinus Walleij .s2div = icst525_s2div, 4370ee6577SLinus Walleij .idx2s = icst525_idx2s, 4470ee6577SLinus Walleij }; 4570ee6577SLinus Walleij 4670ee6577SLinus Walleij static const struct clk_icst_desc impd1_icst1_desc = { 4770ee6577SLinus Walleij .params = &impd1_vco_params, 4870ee6577SLinus Walleij .vco_offset = IMPD1_OSC1, 4970ee6577SLinus Walleij .lock_offset = IMPD1_LOCK, 5070ee6577SLinus Walleij }; 5170ee6577SLinus Walleij 5270ee6577SLinus Walleij /** 5370ee6577SLinus Walleij * integrator_impd1_clk_init() - set up the integrator clock tree 5470ee6577SLinus Walleij * @base: base address of the logic module (LM) 5570ee6577SLinus Walleij * @id: the ID of this LM 5670ee6577SLinus Walleij */ 5770ee6577SLinus Walleij void integrator_impd1_clk_init(void __iomem *base, unsigned int id) 5870ee6577SLinus Walleij { 5970ee6577SLinus Walleij struct impd1_clk *imc; 6070ee6577SLinus Walleij struct clk *clk; 6170ee6577SLinus Walleij int i; 6270ee6577SLinus Walleij 6370ee6577SLinus Walleij if (id > 3) { 6470ee6577SLinus Walleij pr_crit("no more than 4 LMs can be attached\n"); 6570ee6577SLinus Walleij return; 6670ee6577SLinus Walleij } 6770ee6577SLinus Walleij imc = &impd1_clks[id]; 6870ee6577SLinus Walleij 6970ee6577SLinus Walleij clk = icst_clk_register(NULL, &impd1_icst1_desc, base); 7070ee6577SLinus Walleij imc->vcoclk = clk; 7170ee6577SLinus Walleij imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id); 7270ee6577SLinus Walleij 7370ee6577SLinus Walleij /* UART reference clock */ 7470ee6577SLinus Walleij clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT, 7570ee6577SLinus Walleij 14745600); 7670ee6577SLinus Walleij imc->uartclk = clk; 7770ee6577SLinus Walleij imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00100", id); 7870ee6577SLinus Walleij imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00200", id); 7970ee6577SLinus Walleij 8070ee6577SLinus Walleij for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 8170ee6577SLinus Walleij clkdev_add(imc->clks[i]); 8270ee6577SLinus Walleij } 8370ee6577SLinus Walleij 8470ee6577SLinus Walleij void integrator_impd1_clk_exit(unsigned int id) 8570ee6577SLinus Walleij { 8670ee6577SLinus Walleij int i; 8770ee6577SLinus Walleij struct impd1_clk *imc; 8870ee6577SLinus Walleij 8970ee6577SLinus Walleij if (id > 3) 9070ee6577SLinus Walleij return; 9170ee6577SLinus Walleij imc = &impd1_clks[id]; 9270ee6577SLinus Walleij 9370ee6577SLinus Walleij for (i = 0; i < ARRAY_SIZE(imc->clks); i++) 9470ee6577SLinus Walleij clkdev_drop(imc->clks[i]); 9570ee6577SLinus Walleij clk_unregister(imc->uartclk); 9670ee6577SLinus Walleij clk_unregister(imc->vcoclk); 9770ee6577SLinus Walleij } 98