123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/*
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* Clock driver for the ARM RealView boards
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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.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/clk-provider.h>
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#include <mach/hardware.h>
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#include <mach/platform.h>
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#include "clk-icst.h"
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/*
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* Implementation of the ARM RealView clock trees.
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*/
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static void __iomem *sys_lock;
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static void __iomem *sys_vcoreg;
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/**
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* realview_oscvco_get() - get ICST OSC settings for the RealView
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*/
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static struct icst_vco realview_oscvco_get(void)
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{
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u32 val;
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struct icst_vco vco;
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val = readl(sys_vcoreg);
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vco.v = val & 0x1ff;
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vco.r = (val >> 9) & 0x7f;
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vco.s = (val >> 16) & 03;
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return vco;
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}
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static void realview_oscvco_set(struct icst_vco vco)
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{
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u32 val;
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val = readl(sys_vcoreg) & ~0x7ffff;
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val |= vco.v | (vco.r << 9) | (vco.s << 16);
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/* This magic unlocks the CM VCO so it can be controlled */
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writel(0xa05f, sys_lock);
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writel(val, sys_vcoreg);
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/* This locks the CM again */
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writel(0, sys_lock);
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}
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static const struct icst_params realview_oscvco_params = {
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.ref = 24000000,
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.vco_max = ICST307_VCO_MAX,
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.vco_min = ICST307_VCO_MIN,
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.vd_min = 4 + 8,
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.vd_max = 511 + 8,
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.rd_min = 1 + 2,
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.rd_max = 127 + 2,
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.s2div = icst307_s2div,
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.idx2s = icst307_idx2s,
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};
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static const struct clk_icst_desc __initdata realview_icst_desc = {
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.params = &realview_oscvco_params,
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.getvco = realview_oscvco_get,
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.setvco = realview_oscvco_set,
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};
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/*
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* realview_clk_init() - set up the RealView clock tree
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*/
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void __init realview_clk_init(void __iomem *sysbase, bool is_pb1176)
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{
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struct clk *clk;
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sys_lock = sysbase + REALVIEW_SYS_LOCK_OFFSET;
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if (is_pb1176)
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sys_vcoreg = sysbase + REALVIEW_SYS_OSC0_OFFSET;
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else
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sys_vcoreg = sysbase + REALVIEW_SYS_OSC4_OFFSET;
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/* APB clock dummy */
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clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
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clk_register_clkdev(clk, "apb_pclk", NULL);
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/* 24 MHz clock */
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clk = clk_register_fixed_rate(NULL, "clk24mhz", NULL, CLK_IS_ROOT,
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24000000);
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clk_register_clkdev(clk, NULL, "dev:uart0");
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clk_register_clkdev(clk, NULL, "dev:uart1");
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clk_register_clkdev(clk, NULL, "dev:uart2");
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clk_register_clkdev(clk, NULL, "fpga:kmi0");
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clk_register_clkdev(clk, NULL, "fpga:kmi1");
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clk_register_clkdev(clk, NULL, "fpga:mmc0");
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clk_register_clkdev(clk, NULL, "dev:ssp0");
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if (is_pb1176) {
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/*
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* UART3 is on the dev chip in PB1176
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* UART4 only exists in PB1176
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*/
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clk_register_clkdev(clk, NULL, "dev:uart3");
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clk_register_clkdev(clk, NULL, "dev:uart4");
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} else
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clk_register_clkdev(clk, NULL, "fpga:uart3");
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/* 1 MHz clock */
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clk = clk_register_fixed_rate(NULL, "clk1mhz", NULL, CLK_IS_ROOT,
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1000000);
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clk_register_clkdev(clk, NULL, "sp804");
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/* ICST VCO clock */
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clk = icst_clk_register(NULL, &realview_icst_desc);
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clk_register_clkdev(clk, NULL, "dev:clcd");
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clk_register_clkdev(clk, NULL, "issp:clcd");
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}
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