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121 lines
3.1 KiB
121 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2017, Intel Corporation |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include "stratix10-clk.h" |
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#include "clk.h" |
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#define SOCFPGA_CS_PDBG_CLK "cs_pdbg_clk" |
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#define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw) |
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static unsigned long socfpga_gate_clk_recalc_rate(struct clk_hw *hwclk, |
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unsigned long parent_rate) |
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{ |
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struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk); |
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u32 div = 1, val; |
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if (socfpgaclk->fixed_div) { |
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div = socfpgaclk->fixed_div; |
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} else if (socfpgaclk->div_reg) { |
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val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift; |
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val &= GENMASK(socfpgaclk->width - 1, 0); |
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div = (1 << val); |
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} |
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return parent_rate / div; |
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} |
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static unsigned long socfpga_dbg_clk_recalc_rate(struct clk_hw *hwclk, |
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unsigned long parent_rate) |
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{ |
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struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk); |
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u32 div = 1, val; |
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val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift; |
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val &= GENMASK(socfpgaclk->width - 1, 0); |
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div = (1 << val); |
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div = div ? 4 : 1; |
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return parent_rate / div; |
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} |
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static u8 socfpga_gate_get_parent(struct clk_hw *hwclk) |
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{ |
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struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk); |
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u32 mask; |
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u8 parent = 0; |
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if (socfpgaclk->bypass_reg) { |
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mask = (0x1 << socfpgaclk->bypass_shift); |
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parent = ((readl(socfpgaclk->bypass_reg) & mask) >> |
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socfpgaclk->bypass_shift); |
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} |
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return parent; |
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} |
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static struct clk_ops gateclk_ops = { |
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.recalc_rate = socfpga_gate_clk_recalc_rate, |
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.get_parent = socfpga_gate_get_parent, |
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}; |
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static const struct clk_ops dbgclk_ops = { |
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.recalc_rate = socfpga_dbg_clk_recalc_rate, |
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.get_parent = socfpga_gate_get_parent, |
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}; |
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struct clk *s10_register_gate(const struct stratix10_gate_clock *clks, void __iomem *regbase) |
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{ |
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struct clk *clk; |
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struct socfpga_gate_clk *socfpga_clk; |
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struct clk_init_data init; |
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const char *parent_name = clks->parent_name; |
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socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL); |
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if (!socfpga_clk) |
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return NULL; |
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socfpga_clk->hw.reg = regbase + clks->gate_reg; |
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socfpga_clk->hw.bit_idx = clks->gate_idx; |
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gateclk_ops.enable = clk_gate_ops.enable; |
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gateclk_ops.disable = clk_gate_ops.disable; |
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socfpga_clk->fixed_div = clks->fixed_div; |
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if (clks->div_reg) |
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socfpga_clk->div_reg = regbase + clks->div_reg; |
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else |
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socfpga_clk->div_reg = NULL; |
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socfpga_clk->width = clks->div_width; |
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socfpga_clk->shift = clks->div_offset; |
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if (clks->bypass_reg) |
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socfpga_clk->bypass_reg = regbase + clks->bypass_reg; |
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else |
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socfpga_clk->bypass_reg = NULL; |
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socfpga_clk->bypass_shift = clks->bypass_shift; |
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if (streq(clks->name, "cs_pdbg_clk")) |
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init.ops = &dbgclk_ops; |
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else |
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init.ops = &gateclk_ops; |
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init.name = clks->name; |
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init.flags = clks->flags; |
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init.num_parents = clks->num_parents; |
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init.parent_names = parent_name ? &parent_name : NULL; |
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if (init.parent_names == NULL) |
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init.parent_data = clks->parent_data; |
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socfpga_clk->hw.hw.init = &init; |
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clk = clk_register(NULL, &socfpga_clk->hw.hw); |
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if (WARN_ON(IS_ERR(clk))) { |
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kfree(socfpga_clk); |
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return NULL; |
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} |
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return clk; |
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}
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