PLL5 generates FOUTPOSTDIV clk and is sourced by LCDC/DSI modules. The FOUTPOSTDIV is connected to PLL5_4 MUX. Video clock is sourced from DSI divider which is connected to PLL5_4 MUX. This patch adds support for generating FOUTPOSTDIV clk. Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> --- V1->V2: * Added Rb tag from Geert * Added Code comments related to clk handling * Split struct rzg2l_pll5_param and added struct rzg2l_pll5_mux_dsi_div_param for priv. * Added {get_foutpostdiv_rate, get_vclk_rate} helper function * used div_u64 to avoid overflow on 32 bit systems * Added CPG_SIPLL5_STBY_DOWNSPREAD_WEN macro * Added pl5_spread and updated CPG_SIPLL5_CLK5 setting. RFC->V1: * Removed LUT. * Replaced magic numbers with macros. RFC: *https://patchwork.kernel.org/project/linux-renesas-soc/patch/20220112174612.10773-2-biju.das.jz@xxxxxxxxxxxxxx/ --- drivers/clk/renesas/rzg2l-cpg.c | 212 ++++++++++++++++++++++++++++++++ drivers/clk/renesas/rzg2l-cpg.h | 23 ++++ 2 files changed, 235 insertions(+) diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index 1ce35f65682b..69e0cef0b058 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -27,6 +27,7 @@ #include <linux/pm_domain.h> #include <linux/reset-controller.h> #include <linux/slab.h> +#include <linux/units.h> #include <dt-bindings/clock/renesas-cpg-mssr.h> @@ -64,6 +65,21 @@ struct sd_hw_data { #define to_sd_hw_data(_hw) container_of(_hw, struct sd_hw_data, hw) +struct rzg2l_pll5_param { + u32 pl5_fracin; + u8 pl5_refdiv; + u8 pl5_intin; + u8 pl5_postdiv1; + u8 pl5_postdiv2; + u8 pl5_spread; +}; + +struct rzg2l_pll5_mux_dsi_div_param { + u8 clksrc; + u8 dsi_div_a; + u8 dsi_div_b; +}; + /** * struct rzg2l_cpg_priv - Clock Pulse Generator Private Data * @@ -77,6 +93,7 @@ struct sd_hw_data { * @num_resets: Number of Module Resets in info->resets[] * @last_dt_core_clk: ID of the last Core Clock exported to DT * @info: Pointer to platform data + * @pll5_mux_dsi_div_params: pll5 mux and dsi div parameters */ struct rzg2l_cpg_priv { struct reset_controller_dev rcdev; @@ -91,6 +108,8 @@ struct rzg2l_cpg_priv { unsigned int last_dt_core_clk; const struct rzg2l_cpg_info *info; + + struct rzg2l_pll5_mux_dsi_div_param mux_dsi_div_params; }; static void rzg2l_cpg_del_clk_provider(void *data) @@ -264,6 +283,196 @@ rzg2l_cpg_sd_mux_clk_register(const struct cpg_core_clk *core, return clk_hw->clk; } +static unsigned long +rzg2l_cpg_get_foutpostdiv_rate(struct rzg2l_pll5_param *params, + unsigned long rate) +{ + unsigned long foutpostdiv_rate; + + params->pl5_intin = rate / MEGA; + params->pl5_fracin = div_u64(((u64)rate % MEGA) << 24, MEGA); + params->pl5_refdiv = 2; + params->pl5_postdiv1 = 1; + params->pl5_postdiv2 = 1; + params->pl5_spread = 0x16; + + foutpostdiv_rate = + EXTAL_FREQ_IN_MEGA_HZ * MEGA / params->pl5_refdiv * + ((((params->pl5_intin << 24) + params->pl5_fracin)) >> 24) / + (params->pl5_postdiv1 * params->pl5_postdiv2); + + return foutpostdiv_rate; +} + +struct sipll5 { + struct clk_hw hw; + u32 conf; + unsigned long foutpostdiv_rate; + struct rzg2l_cpg_priv *priv; +}; + +#define to_sipll5(_hw) container_of(_hw, struct sipll5, hw) + +static unsigned long rzg2l_cpg_get_vclk_rate(struct clk_hw *hw, + unsigned long rate) +{ + struct sipll5 *sipll5 = to_sipll5(hw); + struct rzg2l_cpg_priv *priv = sipll5->priv; + unsigned long vclk; + + vclk = rate / ((1 << priv->mux_dsi_div_params.dsi_div_a) * + (priv->mux_dsi_div_params.dsi_div_b + 1)); + + if (priv->mux_dsi_div_params.clksrc) + vclk /= 2; + + return vclk; +} + +static unsigned long rzg2l_cpg_sipll5_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct sipll5 *sipll5 = to_sipll5(hw); + unsigned long pll5_rate = sipll5->foutpostdiv_rate; + + if (!pll5_rate) + pll5_rate = parent_rate; + + return pll5_rate; +} + +static long rzg2l_cpg_sipll5_round_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long *parent_rate) +{ + return rate; +} + +static int rzg2l_cpg_sipll5_set_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long parent_rate) +{ + struct sipll5 *sipll5 = to_sipll5(hw); + struct rzg2l_cpg_priv *priv = sipll5->priv; + struct rzg2l_pll5_param params; + unsigned long vclk_rate; + int ret; + u32 val; + + /* + * OSC --> PLL5 --> FOUTPOSTDIV-->| + * | | -->MUX -->DIV_DSIA_B -->M3 -->VCLK + * |--FOUT1PH0-->| + * + * Based on the dot clock, the DSI divider clock calculates the parent + * rate and the pll5 parameters for generating FOUTPOSTDIV. It propagates + * that info to sipll5 which sets parameters for generating FOUTPOSTDIV. + * + * OSC --> PLL5 --> FOUTPOSTDIV + */ + + if (!rate) + return -EINVAL; + + vclk_rate = rzg2l_cpg_get_vclk_rate(hw, rate); + sipll5->foutpostdiv_rate = + rzg2l_cpg_get_foutpostdiv_rate(¶ms, vclk_rate); + + /* Put PLL5 into standby mode */ + writel(CPG_SIPLL5_STBY_RESETB_WEN, priv->base + CPG_SIPLL5_STBY); + ret = readl_poll_timeout(priv->base + CPG_SIPLL5_MON, val, + !(val & CPG_SIPLL5_MON_PLL5_LOCK), 100, 250000); + if (ret) { + dev_err(priv->dev, "failed to release pll5 lock"); + return ret; + } + + /* Output clock setting 1 */ + writel(CPG_SIPLL5_CLK1_POSTDIV1_WEN | CPG_SIPLL5_CLK1_REFDIV_WEN | + CPG_SIPLL5_CLK1_REFDIV_WEN | (params.pl5_postdiv1 << 0) | + (params.pl5_postdiv2 << 4) | (params.pl5_refdiv << 8), + priv->base + CPG_SIPLL5_CLK1); + + /* Output clock setting, SSCG modulation value setting 3 */ + writel((params.pl5_fracin << 8), priv->base + CPG_SIPLL5_CLK3); + + /* Output clock setting 4 */ + writel(CPG_SIPLL5_CLK4_RESV_LSB | (params.pl5_intin << 16), + priv->base + CPG_SIPLL5_CLK4); + + /* Output clock setting 5 */ + writel(params.pl5_spread, priv->base + CPG_SIPLL5_CLK5); + + /* PLL normal mode setting */ + writel(CPG_SIPLL5_STBY_DOWNSPREAD_WEN | CPG_SIPLL5_STBY_SSCG_EN_WEN | + CPG_SIPLL5_STBY_RESETB_WEN | CPG_SIPLL5_STBY_RESETB, + priv->base + CPG_SIPLL5_STBY); + + /* PLL normal mode transition, output clock stability check */ + ret = readl_poll_timeout(priv->base + CPG_SIPLL5_MON, val, + (val & CPG_SIPLL5_MON_PLL5_LOCK), 100, 250000); + if (ret) { + dev_err(priv->dev, "failed to lock pll5"); + return ret; + } + + return 0; +} + +static const struct clk_ops rzg2l_cpg_sipll5_ops = { + .recalc_rate = rzg2l_cpg_sipll5_recalc_rate, + .round_rate = rzg2l_cpg_sipll5_round_rate, + .set_rate = rzg2l_cpg_sipll5_set_rate, +}; + +static struct clk * __init +rzg2l_cpg_sipll5_register(const struct cpg_core_clk *core, + struct clk **clks, + struct rzg2l_cpg_priv *priv) +{ + const struct clk *parent; + struct clk_init_data init; + const char *parent_name; + struct sipll5 *sipll5; + struct clk_hw *clk_hw; + int ret; + + parent = clks[core->parent & 0xffff]; + if (IS_ERR(parent)) + return ERR_CAST(parent); + + sipll5 = devm_kzalloc(priv->dev, sizeof(*sipll5), GFP_KERNEL); + if (!sipll5) + return ERR_PTR(-ENOMEM); + + init.name = core->name; + parent_name = __clk_get_name(parent); + init.ops = &rzg2l_cpg_sipll5_ops; + init.flags = 0; + init.parent_names = &parent_name; + init.num_parents = 1; + + sipll5->hw.init = &init; + sipll5->conf = core->conf; + sipll5->priv = priv; + + writel(CPG_SIPLL5_STBY_SSCG_EN_WEN | CPG_SIPLL5_STBY_RESETB_WEN | + CPG_SIPLL5_STBY_RESETB, priv->base + CPG_SIPLL5_STBY); + + clk_hw = &sipll5->hw; + clk_hw->init = &init; + + ret = devm_clk_hw_register(priv->dev, clk_hw); + if (ret) + return ERR_PTR(ret); + + priv->mux_dsi_div_params.clksrc = 1; /* Use clk src 1 for DSI */ + priv->mux_dsi_div_params.dsi_div_a = 1; /* Divided by 2 */ + priv->mux_dsi_div_params.dsi_div_b = 2; /* Divided by 3 */ + + return clk_hw->clk; +} + struct pll_clk { struct clk_hw hw; unsigned int conf; @@ -418,6 +627,9 @@ rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core, clk = rzg2l_cpg_pll_clk_register(core, priv->clks, priv->base, priv); break; + case CLK_TYPE_SIPLL5: + clk = rzg2l_cpg_sipll5_register(core, priv->clks, priv); + break; case CLK_TYPE_DIV: clk = rzg2l_cpg_div_clk_register(core, priv->clks, priv->base, priv); diff --git a/drivers/clk/renesas/rzg2l-cpg.h b/drivers/clk/renesas/rzg2l-cpg.h index 92c88f42ca7f..c39c0ca8d155 100644 --- a/drivers/clk/renesas/rzg2l-cpg.h +++ b/drivers/clk/renesas/rzg2l-cpg.h @@ -9,6 +9,12 @@ #ifndef __RENESAS_RZG2L_CPG_H__ #define __RENESAS_RZG2L_CPG_H__ +#define CPG_SIPLL5_STBY (0x140) +#define CPG_SIPLL5_CLK1 (0x144) +#define CPG_SIPLL5_CLK3 (0x14C) +#define CPG_SIPLL5_CLK4 (0x150) +#define CPG_SIPLL5_CLK5 (0x154) +#define CPG_SIPLL5_MON (0x15C) #define CPG_PL1_DDIV (0x200) #define CPG_PL2_DDIV (0x204) #define CPG_PL3A_DDIV (0x208) @@ -19,6 +25,16 @@ #define CPG_PL6_SSEL (0x414) #define CPG_PL6_ETH_SSEL (0x418) +#define CPG_SIPLL5_STBY_RESETB BIT(0) +#define CPG_SIPLL5_STBY_RESETB_WEN BIT(16) +#define CPG_SIPLL5_STBY_SSCG_EN_WEN BIT(18) +#define CPG_SIPLL5_STBY_DOWNSPREAD_WEN BIT(20) +#define CPG_SIPLL5_CLK1_POSTDIV1_WEN BIT(16) +#define CPG_SIPLL5_CLK1_POSTDIV2_WEN BIT(20) +#define CPG_SIPLL5_CLK1_REFDIV_WEN BIT(24) +#define CPG_SIPLL5_CLK4_RESV_LSB (0xFF) +#define CPG_SIPLL5_MON_PLL5_LOCK BIT(4) + #define CPG_CLKSTATUS_SELSDHI0_STS BIT(28) #define CPG_CLKSTATUS_SELSDHI1_STS BIT(29) @@ -49,6 +65,8 @@ #define SEL_SDHI0 DDIV_PACK(CPG_PL2SDHI_DSEL, 0, 2) #define SEL_SDHI1 DDIV_PACK(CPG_PL2SDHI_DSEL, 4, 2) +#define EXTAL_FREQ_IN_MEGA_HZ (24) + /** * Definitions of CPG Core Clocks * @@ -86,6 +104,9 @@ enum clk_types { /* Clock with SD clock source selector */ CLK_TYPE_SD_MUX, + + /* Clock for SIPLL5 */ + CLK_TYPE_SIPLL5, }; #define DEF_TYPE(_name, _id, _type...) \ @@ -109,6 +130,8 @@ enum clk_types { #define DEF_SD_MUX(_name, _id, _conf, _parent_names, _num_parents) \ DEF_TYPE(_name, _id, CLK_TYPE_SD_MUX, .conf = _conf, \ .parent_names = _parent_names, .num_parents = _num_parents) +#define DEF_PLL5_FOUTPOSTDIV(_name, _id, _parent) \ + DEF_TYPE(_name, _id, CLK_TYPE_SIPLL5, .parent = _parent) /** * struct rzg2l_mod_clk - Module Clocks definitions -- 2.25.1