98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
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/*
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* Clock driver for the ARM Integrator/IM-PD1 board
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* Copyright (C) 2012 Linus Walleij
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/platform_data/clk-integrator.h>
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#include <mach/impd1.h>
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#include "clk-icst.h"
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struct impd1_clk {
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struct clk *vcoclk;
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struct clk *uartclk;
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struct clk_lookup *clks[3];
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};
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static struct impd1_clk impd1_clks[4];
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/*
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* There are two VCO's on the IM-PD1 but only one is used by the
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* kernel, that is why we are only implementing the control of
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* IMPD1_OSC1 here.
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*/
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static const struct icst_params impd1_vco_params = {
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.ref = 24000000, /* 24 MHz */
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.vco_max = ICST525_VCO_MAX_3V,
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.vco_min = ICST525_VCO_MIN,
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.vd_min = 12,
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.vd_max = 519,
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.rd_min = 3,
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.rd_max = 120,
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.s2div = icst525_s2div,
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.idx2s = icst525_idx2s,
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};
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static const struct clk_icst_desc impd1_icst1_desc = {
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.params = &impd1_vco_params,
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.vco_offset = IMPD1_OSC1,
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.lock_offset = IMPD1_LOCK,
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};
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/**
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* integrator_impd1_clk_init() - set up the integrator clock tree
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* @base: base address of the logic module (LM)
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* @id: the ID of this LM
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*/
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void integrator_impd1_clk_init(void __iomem *base, unsigned int id)
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{
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struct impd1_clk *imc;
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struct clk *clk;
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int i;
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if (id > 3) {
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pr_crit("no more than 4 LMs can be attached\n");
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return;
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}
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imc = &impd1_clks[id];
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clk = icst_clk_register(NULL, &impd1_icst1_desc, base);
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imc->vcoclk = clk;
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imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id);
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/* UART reference clock */
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clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT,
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14745600);
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imc->uartclk = clk;
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imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00100", id);
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imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00200", id);
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for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
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clkdev_add(imc->clks[i]);
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}
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void integrator_impd1_clk_exit(unsigned int id)
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{
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int i;
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struct impd1_clk *imc;
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if (id > 3)
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return;
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imc = &impd1_clks[id];
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for (i = 0; i < ARRAY_SIZE(imc->clks); i++)
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clkdev_drop(imc->clks[i]);
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clk_unregister(imc->uartclk);
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clk_unregister(imc->vcoclk);
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}
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