97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
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/*
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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/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 "clk-icst.h"
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#define REALVIEW_SYS_OSC0_OFFSET 0x0C
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#define REALVIEW_SYS_OSC1_OFFSET 0x10
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#define REALVIEW_SYS_OSC2_OFFSET 0x14
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#define REALVIEW_SYS_OSC3_OFFSET 0x18
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#define REALVIEW_SYS_OSC4_OFFSET 0x1C /* OSC1 for RealView/AB */
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#define REALVIEW_SYS_LOCK_OFFSET 0x20
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/*
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* Implementation of the ARM RealView clock trees.
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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 realview_osc0_desc __initconst = {
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.params = &realview_oscvco_params,
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.vco_offset = REALVIEW_SYS_OSC0_OFFSET,
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.lock_offset = REALVIEW_SYS_LOCK_OFFSET,
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};
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static const struct clk_icst_desc realview_osc4_desc __initconst = {
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.params = &realview_oscvco_params,
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.vco_offset = REALVIEW_SYS_OSC4_OFFSET,
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.lock_offset = REALVIEW_SYS_LOCK_OFFSET,
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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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/* APB clock dummy */
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clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, 0, 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, 0, 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, 0, 1000000);
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clk_register_clkdev(clk, NULL, "sp804");
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/* ICST VCO clock */
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if (is_pb1176)
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clk = icst_clk_register(NULL, &realview_osc0_desc,
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"osc0", NULL, sysbase);
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else
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clk = icst_clk_register(NULL, &realview_osc4_desc,
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"osc4", NULL, sysbase);
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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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