134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*
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* Copyright 2011-2012 Calxeda, Inc.
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* Copyright (C) 2012-2013 Altera Corporation <www.altera.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Based from clk-highbank.c
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*
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*/
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#include <linux/slab.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "clk.h"
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/* Clock bypass bits */
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#define MAINPLL_BYPASS (1<<0)
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#define SDRAMPLL_BYPASS (1<<1)
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#define SDRAMPLL_SRC_BYPASS (1<<2)
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#define PERPLL_BYPASS (1<<3)
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#define PERPLL_SRC_BYPASS (1<<4)
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#define SOCFPGA_PLL_BG_PWRDWN 0
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#define SOCFPGA_PLL_EXT_ENA 1
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#define SOCFPGA_PLL_PWR_DOWN 2
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#define SOCFPGA_PLL_DIVF_MASK 0x0000FFF8
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#define SOCFPGA_PLL_DIVF_SHIFT 3
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#define SOCFPGA_PLL_DIVQ_MASK 0x003F0000
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#define SOCFPGA_PLL_DIVQ_SHIFT 16
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#define CLK_MGR_PLL_CLK_SRC_SHIFT 22
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#define CLK_MGR_PLL_CLK_SRC_MASK 0x3
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#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
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void __iomem *clk_mgr_base_addr;
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static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
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unsigned long parent_rate)
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{
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struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
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unsigned long divf, divq, reg;
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unsigned long long vco_freq;
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unsigned long bypass;
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reg = readl(socfpgaclk->hw.reg);
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bypass = readl(clk_mgr_base_addr + CLKMGR_BYPASS);
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if (bypass & MAINPLL_BYPASS)
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return parent_rate;
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divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT;
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divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT;
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vco_freq = (unsigned long long)parent_rate * (divf + 1);
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do_div(vco_freq, (1 + divq));
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return (unsigned long)vco_freq;
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}
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static u8 clk_pll_get_parent(struct clk_hw *hwclk)
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{
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u32 pll_src;
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struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
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pll_src = readl(socfpgaclk->hw.reg);
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return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
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CLK_MGR_PLL_CLK_SRC_MASK;
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}
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static struct clk_ops clk_pll_ops = {
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.recalc_rate = clk_pll_recalc_rate,
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.get_parent = clk_pll_get_parent,
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};
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static __init struct clk *__socfpga_pll_init(struct device_node *node,
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const struct clk_ops *ops)
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{
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u32 reg;
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struct clk *clk;
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struct socfpga_pll *pll_clk;
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const char *clk_name = node->name;
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const char *parent_name[SOCFPGA_MAX_PARENTS];
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struct clk_init_data init = {};
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struct device_node *clkmgr_np;
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int rc;
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of_property_read_u32(node, "reg", ®);
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pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
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if (WARN_ON(!pll_clk))
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return NULL;
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clkmgr_np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
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clk_mgr_base_addr = of_iomap(clkmgr_np, 0);
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of_node_put(clkmgr_np);
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BUG_ON(!clk_mgr_base_addr);
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pll_clk->hw.reg = clk_mgr_base_addr + reg;
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of_property_read_string(node, "clock-output-names", &clk_name);
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init.name = clk_name;
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init.ops = ops;
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init.flags = 0;
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init.num_parents = of_clk_parent_fill(node, parent_name, SOCFPGA_MAX_PARENTS);
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init.parent_names = parent_name;
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pll_clk->hw.hw.init = &init;
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pll_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;
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clk_pll_ops.enable = clk_gate_ops.enable;
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clk_pll_ops.disable = clk_gate_ops.disable;
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clk = clk_register(NULL, &pll_clk->hw.hw);
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if (WARN_ON(IS_ERR(clk))) {
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kfree(pll_clk);
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return NULL;
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}
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rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
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return clk;
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}
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void __init socfpga_pll_init(struct device_node *node)
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{
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__socfpga_pll_init(node, &clk_pll_ops);
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}
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