// SPDX-License-Identifier: GPL-2.0 /* * R-Car Gen4 Clock Pulse Generator * * Copyright (C) 2021 Renesas Electronics Corp. * * Based on rcar-gen3-cpg.c * * Copyright (C) 2015-2018 Glider bvba * Copyright (C) 2019 Renesas Electronics Corp. */ #include #include #include #include #include #include #include #include #include "renesas-cpg-mssr.h" #include "rcar-gen4-cpg.h" #include "rcar-cpg-lib.h" static const struct rcar_gen4_cpg_pll_config *cpg_pll_config __initconst; static unsigned int cpg_clk_extalr __initdata; static u32 cpg_mode __initdata; /* * Z0 Clock & Z1 Clock */ #define CPG_FRQCRB 0x00000804 #define CPG_FRQCRB_KICK BIT(31) #define CPG_FRQCRC 0x00000808 struct cpg_z_clk { struct clk_hw hw; void __iomem *reg; void __iomem *kick_reg; unsigned long max_rate; /* Maximum rate for normal mode */ unsigned int fixed_div; u32 mask; }; #define to_z_clk(_hw) container_of(_hw, struct cpg_z_clk, hw) static unsigned long cpg_z_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct cpg_z_clk *zclk = to_z_clk(hw); unsigned int mult; u32 val; val = readl(zclk->reg) & zclk->mask; mult = 32 - (val >> __ffs(zclk->mask)); return DIV_ROUND_CLOSEST_ULL((u64)parent_rate * mult, 32 * zclk->fixed_div); } static int cpg_z_clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct cpg_z_clk *zclk = to_z_clk(hw); unsigned int min_mult, max_mult, mult; unsigned long rate, prate; rate = min(req->rate, req->max_rate); if (rate <= zclk->max_rate) { /* Set parent rate to initial value for normal modes */ prate = zclk->max_rate; } else { /* Set increased parent rate for boost modes */ prate = rate; } req->best_parent_rate = clk_hw_round_rate(clk_hw_get_parent(hw), prate * zclk->fixed_div); prate = req->best_parent_rate / zclk->fixed_div; min_mult = max(div64_ul(req->min_rate * 32ULL, prate), 1ULL); max_mult = min(div64_ul(req->max_rate * 32ULL, prate), 32ULL); if (max_mult < min_mult) return -EINVAL; mult = DIV_ROUND_CLOSEST_ULL(rate * 32ULL, prate); mult = clamp(mult, min_mult, max_mult); req->rate = DIV_ROUND_CLOSEST_ULL((u64)prate * mult, 32); return 0; } static int cpg_z_clk_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct cpg_z_clk *zclk = to_z_clk(hw); unsigned int mult; unsigned int i; mult = DIV64_U64_ROUND_CLOSEST(rate * 32ULL * zclk->fixed_div, parent_rate); mult = clamp(mult, 1U, 32U); if (readl(zclk->kick_reg) & CPG_FRQCRB_KICK) return -EBUSY; cpg_reg_modify(zclk->reg, zclk->mask, (32 - mult) << __ffs(zclk->mask)); /* * Set KICK bit in FRQCRB to update hardware setting and wait for * clock change completion. */ cpg_reg_modify(zclk->kick_reg, 0, CPG_FRQCRB_KICK); /* * Note: There is no HW information about the worst case latency. * * Using experimental measurements, it seems that no more than * ~10 iterations are needed, independently of the CPU rate. * Since this value might be dependent on external xtal rate, pll1 * rate or even the other emulation clocks rate, use 1000 as a * "super" safe value. */ for (i = 1000; i; i--) { if (!(readl(zclk->kick_reg) & CPG_FRQCRB_KICK)) return 0; cpu_relax(); } return -ETIMEDOUT; } static const struct clk_ops cpg_z_clk_ops = { .recalc_rate = cpg_z_clk_recalc_rate, .determine_rate = cpg_z_clk_determine_rate, .set_rate = cpg_z_clk_set_rate, }; static struct clk * __init cpg_z_clk_register(const char *name, const char *parent_name, void __iomem *reg, unsigned int div, unsigned int offset) { struct clk_init_data init = {}; struct cpg_z_clk *zclk; struct clk *clk; zclk = kzalloc(sizeof(*zclk), GFP_KERNEL); if (!zclk) return ERR_PTR(-ENOMEM); init.name = name; init.ops = &cpg_z_clk_ops; init.flags = CLK_SET_RATE_PARENT; init.parent_names = &parent_name; init.num_parents = 1; zclk->reg = reg + CPG_FRQCRC; zclk->kick_reg = reg + CPG_FRQCRB; zclk->hw.init = &init; zclk->mask = GENMASK(offset + 4, offset); zclk->fixed_div = div; /* PLLVCO x 1/div x SYS-CPU divider */ clk = clk_register(NULL, &zclk->hw); if (IS_ERR(clk)) { kfree(zclk); return clk; } zclk->max_rate = clk_hw_get_rate(clk_hw_get_parent(&zclk->hw)) / zclk->fixed_div; return clk; } /* * RPC Clocks */ static const struct clk_div_table cpg_rpcsrc_div_table[] = { { 0, 4 }, { 1, 6 }, { 2, 5 }, { 3, 6 }, { 0, 0 }, }; struct clk * __init rcar_gen4_cpg_clk_register(struct device *dev, const struct cpg_core_clk *core, const struct cpg_mssr_info *info, struct clk **clks, void __iomem *base, struct raw_notifier_head *notifiers) { const struct clk *parent; unsigned int mult = 1; unsigned int div = 1; u32 value; parent = clks[core->parent & 0xffff]; /* some types use high bits */ if (IS_ERR(parent)) return ERR_CAST(parent); switch (core->type) { case CLK_TYPE_GEN4_MAIN: div = cpg_pll_config->extal_div; break; case CLK_TYPE_GEN4_PLL1: mult = cpg_pll_config->pll1_mult; div = cpg_pll_config->pll1_div; break; case CLK_TYPE_GEN4_PLL2: mult = cpg_pll_config->pll2_mult; div = cpg_pll_config->pll2_div; break; case CLK_TYPE_GEN4_PLL3: mult = cpg_pll_config->pll3_mult; div = cpg_pll_config->pll3_div; break; case CLK_TYPE_GEN4_PLL5: mult = cpg_pll_config->pll5_mult; div = cpg_pll_config->pll5_div; break; case CLK_TYPE_GEN4_PLL6: mult = cpg_pll_config->pll6_mult; div = cpg_pll_config->pll6_div; break; case CLK_TYPE_GEN4_PLL2X_3X: value = readl(base + core->offset); mult = (((value >> 24) & 0x7f) + 1) * 2; break; case CLK_TYPE_GEN4_Z: return cpg_z_clk_register(core->name, __clk_get_name(parent), base, core->div, core->offset); case CLK_TYPE_GEN4_SDSRC: div = ((readl(base + SD0CKCR1) >> 29) & 0x03) + 4; break; case CLK_TYPE_GEN4_SDH: return cpg_sdh_clk_register(core->name, base + core->offset, __clk_get_name(parent), notifiers); case CLK_TYPE_GEN4_SD: return cpg_sd_clk_register(core->name, base + core->offset, __clk_get_name(parent)); case CLK_TYPE_GEN4_MDSEL: /* * Clock selectable between two parents and two fixed dividers * using a mode pin */ if (cpg_mode & BIT(core->offset)) { div = core->div & 0xffff; } else { parent = clks[core->parent >> 16]; if (IS_ERR(parent)) return ERR_CAST(parent); div = core->div >> 16; } mult = 1; break; case CLK_TYPE_GEN4_OSC: /* * Clock combining OSC EXTAL predivider and a fixed divider */ div = cpg_pll_config->osc_prediv * core->div; break; case CLK_TYPE_GEN4_RPCSRC: return clk_register_divider_table(NULL, core->name, __clk_get_name(parent), 0, base + CPG_RPCCKCR, 3, 2, 0, cpg_rpcsrc_div_table, &cpg_lock); case CLK_TYPE_GEN4_RPC: return cpg_rpc_clk_register(core->name, base + CPG_RPCCKCR, __clk_get_name(parent), notifiers); case CLK_TYPE_GEN4_RPCD2: return cpg_rpcd2_clk_register(core->name, base + CPG_RPCCKCR, __clk_get_name(parent)); default: return ERR_PTR(-EINVAL); } return clk_register_fixed_factor(NULL, core->name, __clk_get_name(parent), 0, mult, div); } int __init rcar_gen4_cpg_init(const struct rcar_gen4_cpg_pll_config *config, unsigned int clk_extalr, u32 mode) { cpg_pll_config = config; cpg_clk_extalr = clk_extalr; cpg_mode = mode; spin_lock_init(&cpg_lock); return 0; }