diff options
Diffstat (limited to 'drivers/clk/socfpga/clk-periph-s10.c')
| -rw-r--r-- | drivers/clk/socfpga/clk-periph-s10.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/drivers/clk/socfpga/clk-periph-s10.c b/drivers/clk/socfpga/clk-periph-s10.c new file mode 100644 index 000000000..f5c1ca42b --- /dev/null +++ b/drivers/clk/socfpga/clk-periph-s10.c @@ -0,0 +1,216 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2017, Intel Corporation + */ +#include <linux/slab.h> +#include <linux/clk-provider.h> +#include <linux/io.h> + +#include "stratix10-clk.h" +#include "clk.h" + +#define CLK_MGR_FREE_SHIFT 16 +#define CLK_MGR_FREE_MASK 0x7 +#define SWCTRLBTCLKSEN_SHIFT 8 + +#define to_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw) + +static unsigned long n5x_clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) +{ + struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); + unsigned long div; + unsigned long shift = socfpgaclk->shift; + u32 val; + + val = readl(socfpgaclk->hw.reg); + val &= (0x1f << shift); + div = (val >> shift) + 1; + + return parent_rate / div; +} + +static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) +{ + struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); + unsigned long div = 1; + u32 val; + + val = readl(socfpgaclk->hw.reg); + val &= GENMASK(SWCTRLBTCLKSEN_SHIFT - 1, 0); + parent_rate /= val; + + return parent_rate / div; +} + +static unsigned long clk_peri_cnt_clk_recalc_rate(struct clk_hw *hwclk, + unsigned long parent_rate) +{ + struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); + unsigned long div = 1; + + if (socfpgaclk->fixed_div) { + div = socfpgaclk->fixed_div; + } else { + if (socfpgaclk->hw.reg) + div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1); + } + + return parent_rate / div; +} + +static u8 clk_periclk_get_parent(struct clk_hw *hwclk) +{ + struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); + u32 clk_src, mask; + u8 parent = 0; + + /* handle the bypass first */ + if (socfpgaclk->bypass_reg) { + mask = (0x1 << socfpgaclk->bypass_shift); + parent = ((readl(socfpgaclk->bypass_reg) & mask) >> + socfpgaclk->bypass_shift); + if (parent) + return parent; + } + + if (socfpgaclk->hw.reg) { + clk_src = readl(socfpgaclk->hw.reg); + parent = (clk_src >> CLK_MGR_FREE_SHIFT) & + CLK_MGR_FREE_MASK; + } + return parent; +} + +static const struct clk_ops n5x_peri_c_clk_ops = { + .recalc_rate = n5x_clk_peri_c_clk_recalc_rate, + .get_parent = clk_periclk_get_parent, +}; + +static const struct clk_ops peri_c_clk_ops = { + .recalc_rate = clk_peri_c_clk_recalc_rate, + .get_parent = clk_periclk_get_parent, +}; + +static const struct clk_ops peri_cnt_clk_ops = { + .recalc_rate = clk_peri_cnt_clk_recalc_rate, + .get_parent = clk_periclk_get_parent, +}; + +struct clk_hw *s10_register_periph(const struct stratix10_perip_c_clock *clks, + void __iomem *reg) +{ + struct clk_hw *hw_clk; + struct socfpga_periph_clk *periph_clk; + struct clk_init_data init; + const char *name = clks->name; + const char *parent_name = clks->parent_name; + int ret; + + periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); + if (WARN_ON(!periph_clk)) + return NULL; + + periph_clk->hw.reg = reg + clks->offset; + + init.name = name; + init.ops = &peri_c_clk_ops; + init.flags = clks->flags; + + init.num_parents = clks->num_parents; + init.parent_names = parent_name ? &parent_name : NULL; + if (init.parent_names == NULL) + init.parent_data = clks->parent_data; + + periph_clk->hw.hw.init = &init; + hw_clk = &periph_clk->hw.hw; + + ret = clk_hw_register(NULL, hw_clk); + if (ret) { + kfree(periph_clk); + return ERR_PTR(ret); + } + return hw_clk; +} + +struct clk_hw *n5x_register_periph(const struct n5x_perip_c_clock *clks, + void __iomem *regbase) +{ + struct clk_hw *hw_clk; + struct socfpga_periph_clk *periph_clk; + struct clk_init_data init; + const char *name = clks->name; + const char *parent_name = clks->parent_name; + int ret; + + periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); + if (WARN_ON(!periph_clk)) + return NULL; + + periph_clk->hw.reg = regbase + clks->offset; + periph_clk->shift = clks->shift; + + init.name = name; + init.ops = &n5x_peri_c_clk_ops; + init.flags = clks->flags; + + init.num_parents = clks->num_parents; + init.parent_names = parent_name ? &parent_name : NULL; + + periph_clk->hw.hw.init = &init; + hw_clk = &periph_clk->hw.hw; + + ret = clk_hw_register(NULL, hw_clk); + if (ret) { + kfree(periph_clk); + return ERR_PTR(ret); + } + return hw_clk; +} + +struct clk_hw *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks, + void __iomem *regbase) +{ + struct clk_hw *hw_clk; + struct socfpga_periph_clk *periph_clk; + struct clk_init_data init; + const char *name = clks->name; + const char *parent_name = clks->parent_name; + int ret; + + periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); + if (WARN_ON(!periph_clk)) + return NULL; + + if (clks->offset) + periph_clk->hw.reg = regbase + clks->offset; + else + periph_clk->hw.reg = NULL; + + if (clks->bypass_reg) + periph_clk->bypass_reg = regbase + clks->bypass_reg; + else + periph_clk->bypass_reg = NULL; + periph_clk->bypass_shift = clks->bypass_shift; + periph_clk->fixed_div = clks->fixed_divider; + + init.name = name; + init.ops = &peri_cnt_clk_ops; + init.flags = clks->flags; + + init.num_parents = clks->num_parents; + init.parent_names = parent_name ? &parent_name : NULL; + if (init.parent_names == NULL) + init.parent_data = clks->parent_data; + + periph_clk->hw.hw.init = &init; + hw_clk = &periph_clk->hw.hw; + + ret = clk_hw_register(NULL, hw_clk); + if (ret) { + kfree(periph_clk); + return ERR_PTR(ret); + } + return hw_clk; +} |