From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> Add support for reading the frequency of PLL1/4/6 available on RZ/G3S. The computation formula for PLL frequency is as follows: Fout = (nir + nfr / 4096) * Fin / (mr * pr) Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> --- Changes in v2: - added GENMASK() defines for DIV_P, DIV_M, DIV_NI, DIV_NF - used mul_u64_u32_shr() as suggested by Geert on v1 - s/CLK_TYPE_G3S_SAM_PLL/CLK_TYPE_G3S_PLL/g drivers/clk/renesas/rzg2l-cpg.c | 49 ++++++++++++++++++++++++++++++--- drivers/clk/renesas/rzg2l-cpg.h | 3 ++ 2 files changed, 48 insertions(+), 4 deletions(-) diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index d936832e098f..02058a2d39ca 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -47,6 +47,11 @@ #define PDIV(val) FIELD_GET(GENMASK(5, 0), val) #define SDIV(val) FIELD_GET(GENMASK(2, 0), val) +#define RZG3S_DIV_P GENMASK(28, 26) +#define RZG3S_DIV_M GENMASK(25, 22) +#define RZG3S_DIV_NI GENMASK(21, 13) +#define RZG3S_DIV_NF GENMASK(12, 1) + #define CLK_ON_R(reg) (reg) #define CLK_MON_R(reg) (0x180 + (reg)) #define CLK_RST_R(reg) (reg) @@ -713,11 +718,43 @@ static const struct clk_ops rzg2l_cpg_pll_ops = { .recalc_rate = rzg2l_cpg_pll_clk_recalc_rate, }; +static unsigned long rzg3s_cpg_pll_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct pll_clk *pll_clk = to_pll(hw); + struct rzg2l_cpg_priv *priv = pll_clk->priv; + u32 nir, nfr, mr, pr, val; + u64 rate; + + if (pll_clk->type != CLK_TYPE_G3S_PLL) + return parent_rate; + + val = readl(priv->base + GET_REG_SAMPLL_CLK1(pll_clk->conf)); + + pr = 1 << FIELD_GET(RZG3S_DIV_P, val); + /* Hardware interprets values higher than 8 as p = 16. */ + if (pr > 8) + pr = 16; + + mr = FIELD_GET(RZG3S_DIV_M, val) + 1; + nir = FIELD_GET(RZG3S_DIV_NI, val) + 1; + nfr = FIELD_GET(RZG3S_DIV_NF, val); + + rate = mul_u64_u32_shr(parent_rate, 4096 * nir + nfr, 12); + + return DIV_ROUND_CLOSEST_ULL(rate, (mr * pr)); +} + +static const struct clk_ops rzg3s_cpg_pll_ops = { + .recalc_rate = rzg3s_cpg_pll_clk_recalc_rate, +}; + static struct clk * __init rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core, struct clk **clks, void __iomem *base, - struct rzg2l_cpg_priv *priv) + struct rzg2l_cpg_priv *priv, + const struct clk_ops *ops) { struct device *dev = priv->dev; const struct clk *parent; @@ -735,7 +772,7 @@ rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core, parent_name = __clk_get_name(parent); init.name = core->name; - init.ops = &rzg2l_cpg_pll_ops; + init.ops = ops; init.flags = 0; init.parent_names = &parent_name; init.num_parents = 1; @@ -830,8 +867,12 @@ rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core, core->mult, div); break; case CLK_TYPE_SAM_PLL: - clk = rzg2l_cpg_pll_clk_register(core, priv->clks, - priv->base, priv); + clk = rzg2l_cpg_pll_clk_register(core, priv->clks, priv->base, priv, + &rzg2l_cpg_pll_ops); + break; + case CLK_TYPE_G3S_PLL: + clk = rzg2l_cpg_pll_clk_register(core, priv->clks, priv->base, priv, + &rzg3s_cpg_pll_ops); break; case CLK_TYPE_SIPLL5: clk = rzg2l_cpg_sipll5_register(core, priv->clks, priv); diff --git a/drivers/clk/renesas/rzg2l-cpg.h b/drivers/clk/renesas/rzg2l-cpg.h index 097fd8f61680..20da0c620b90 100644 --- a/drivers/clk/renesas/rzg2l-cpg.h +++ b/drivers/clk/renesas/rzg2l-cpg.h @@ -102,6 +102,7 @@ enum clk_types { CLK_TYPE_IN, /* External Clock Input */ CLK_TYPE_FF, /* Fixed Factor Clock */ CLK_TYPE_SAM_PLL, + CLK_TYPE_G3S_PLL, /* Clock with divider */ CLK_TYPE_DIV, @@ -129,6 +130,8 @@ enum clk_types { DEF_TYPE(_name, _id, _type, .parent = _parent) #define DEF_SAMPLL(_name, _id, _parent, _conf) \ DEF_TYPE(_name, _id, CLK_TYPE_SAM_PLL, .parent = _parent, .conf = _conf) +#define DEF_G3S_PLL(_name, _id, _parent, _conf) \ + DEF_TYPE(_name, _id, CLK_TYPE_G3S_PLL, .parent = _parent, .conf = _conf) #define DEF_INPUT(_name, _id) \ DEF_TYPE(_name, _id, CLK_TYPE_IN) #define DEF_FIXED(_name, _id, _parent, _mult, _div) \ -- 2.39.2