Add CPG core wrapper for RZ/G2L family.
Based on a patch in the BSP by Binh Nguyen
<[email protected]>.
Signed-off-by: Lad Prabhakar <[email protected]>
Reviewed-by: Biju Das <[email protected]>
---
drivers/clk/renesas/Kconfig | 4 +
drivers/clk/renesas/Makefile | 1 +
drivers/clk/renesas/renesas-rzg2l-cpg.c | 958 ++++++++++++++++++++++++
drivers/clk/renesas/renesas-rzg2l-cpg.h | 221 ++++++
4 files changed, 1184 insertions(+)
create mode 100644 drivers/clk/renesas/renesas-rzg2l-cpg.c
create mode 100644 drivers/clk/renesas/renesas-rzg2l-cpg.h
diff --git a/drivers/clk/renesas/Kconfig b/drivers/clk/renesas/Kconfig
index 607e64a17d72..739bb28dacf9 100644
--- a/drivers/clk/renesas/Kconfig
+++ b/drivers/clk/renesas/Kconfig
@@ -34,6 +34,10 @@ config CLK_RENESAS
select CLK_R9A06G032 if ARCH_R9A06G032
select CLK_SH73A0 if ARCH_SH73A0
+config CLK_RENESAS_RZG2L
+ bool "Renesas RZ/G2L SoC clock support" if COMPILE_TEST && !ARCH_RENESAS
+ default y if ARCH_RENESAS
+
if CLK_RENESAS
# SoC
diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
index ef0d2bba92bf..e4f3d7fab67c 100644
--- a/drivers/clk/renesas/Makefile
+++ b/drivers/clk/renesas/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_CLK_RCAR_CPG_LIB) += rcar-cpg-lib.o
obj-$(CONFIG_CLK_RCAR_GEN2_CPG) += rcar-gen2-cpg.o
obj-$(CONFIG_CLK_RCAR_GEN3_CPG) += rcar-gen3-cpg.o
obj-$(CONFIG_CLK_RCAR_USB2_CLOCK_SEL) += rcar-usb2-clock-sel.o
+obj-$(CONFIG_CLK_RENESAS_RZG2L) += renesas-rzg2l-cpg.o
# Generic
obj-$(CONFIG_CLK_RENESAS_CPG_MSSR) += renesas-cpg-mssr.o
diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.c b/drivers/clk/renesas/renesas-rzg2l-cpg.c
new file mode 100644
index 000000000000..dc54ffc6114c
--- /dev/null
+++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
@@ -0,0 +1,958 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RZ/G2L Clock Pulse Generator
+ *
+ * Copyright (C) 2021 Renesas Electronics Corp.
+ *
+ * Based on renesas-cpg-mssr.c
+ *
+ * Copyright (C) 2015 Glider bvba
+ * Copyright (C) 2013 Ideas On Board SPRL
+ * Copyright (C) 2015 Renesas Electronics Corp.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/renesas.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_domain.h>
+#include <linux/psci.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+#include "renesas-rzg2l-cpg.h"
+
+#ifdef DEBUG
+#define WARN_DEBUG(x) WARN_ON(x)
+#else
+#define WARN_DEBUG(x) do { } while (0)
+#endif
+
+#define DIV_RSMASK(v, s, m) ((v >> s) & m)
+#define GET_REG(val) ((val >> 20) & 0xfff)
+#define GET_SHIFT(val) ((val >> 12) & 0xff)
+#define GET_WIDTH(val) ((val >> 8) & 0xf)
+
+#define KDIV(val) DIV_RSMASK(val, 16, 0xffff)
+#define MDIV(val) DIV_RSMASK(val, 6, 0x3ff)
+#define PDIV(val) DIV_RSMASK(val, 0, 0x3f)
+#define SDIV(val) DIV_RSMASK(val, 0, 0x7)
+#define REFDIV(val) DIV_RSMASK(val, 8, 0x3f)
+#define POSTDIV1(val) DIV_RSMASK(val, 0, 0x7)
+#define POSTDIV2(val) DIV_RSMASK(val, 4, 0x7)
+#define FRACIN(val) DIV_RSMASK(val, 8, 0xffffff)
+#define INITIN(val) DIV_RSMASK(val, 16, 0xfff)
+
+/**
+ * Clock Pulse Generator Private Data
+ *
+ * @rcdev: Optional reset controller entity
+ * @dev: CPG/MSSR device
+ * @base: CPG/MSSR register block base address
+ * @rmw_lock: protects RMW register accesses
+ * @clks: Array containing all Core and Module Clocks
+ * @num_core_clks: Number of Core Clocks in clks[]
+ * @num_mod_clks: Number of Module Clocks in clks[]
+ * @last_dt_core_clk: ID of the last Core Clock exported to DT
+ * @notifiers: Notifier chain to save/restore clock state for system resume
+ * @info: Pointer to platform data
+ */
+struct cpg_mssr_priv {
+#ifdef CONFIG_RESET_CONTROLLER
+ struct reset_controller_dev rcdev;
+#endif
+ struct device *dev;
+ void __iomem *base;
+ spinlock_t rmw_lock;
+
+ struct clk **clks;
+ unsigned int num_core_clks;
+ unsigned int num_mod_clks;
+ unsigned int last_dt_core_clk;
+
+ struct raw_notifier_head notifiers;
+ const struct cpg_mssr_info *info;
+};
+
+static void rzg2l_cpg_del_clk_provider(void *data)
+{
+ of_clk_del_provider(data);
+}
+
+static struct clk * __init
+rzg2l_cpg_div_clk_register(const struct cpg_core_clk *core,
+ struct clk **clks,
+ void __iomem *base,
+ struct cpg_mssr_priv *priv)
+{
+ struct device *dev = priv->dev;
+ const struct clk *parent;
+ const char *parent_name;
+ struct clk_hw *clk_hw;
+
+ parent = clks[core->parent & 0xffff];
+ if (IS_ERR(parent))
+ return ERR_CAST(parent);
+
+ parent_name = __clk_get_name(parent);
+
+ if (core->dtable)
+ clk_hw = clk_hw_register_divider_table(dev, core->name,
+ parent_name, 0,
+ base + GET_REG(core->conf),
+ GET_SHIFT(core->conf),
+ GET_WIDTH(core->conf),
+ core->flag,
+ core->dtable,
+ &priv->rmw_lock);
+ else
+ clk_hw = clk_hw_register_divider(dev, core->name,
+ parent_name, 0,
+ base + GET_REG(core->conf),
+ GET_SHIFT(core->conf),
+ GET_WIDTH(core->conf),
+ core->flag, &priv->rmw_lock);
+
+ if (IS_ERR(clk_hw))
+ return NULL;
+
+ return clk_hw->clk;
+}
+
+static struct clk * __init
+rzg2l_cpg_sell_clk_register(const struct cpg_core_clk *core,
+ void __iomem *base, struct cpg_mssr_priv *priv)
+{
+ const struct clk_hw *clk_hw;
+
+ clk_hw = clk_hw_register_mux(priv->dev, core->name,
+ core->parent_names,
+ core->num_parents,
+ core->flag == CLK_MUX_READ_ONLY ?
+ CLK_SET_RATE_PARENT : 0,
+ base + GET_REG(core->conf),
+ GET_SHIFT(core->conf),
+ GET_WIDTH(core->conf),
+ core->flag, &priv->rmw_lock);
+
+ if (IS_ERR(clk_hw))
+ return NULL;
+
+ return clk_hw->clk;
+}
+
+struct div2_clk {
+ struct clk_hw hw;
+ unsigned int conf;
+ const struct clk_div_table *dtable;
+ unsigned int confs;
+ const struct clk_div_table *dtables;
+ void __iomem *base;
+ struct cpg_mssr_priv *priv;
+};
+
+#define to_d2clk(_hw) container_of(_hw, struct div2_clk, hw)
+
+static unsigned int div2_clock_get_div(unsigned int val,
+ const struct clk_div_table *t,
+ int length)
+{
+ int i;
+
+ for (i = 0; i <= length; i++)
+ if (val == t[i].val)
+ return t[i].div;
+
+ /* return div=1 if failed */
+ return 1;
+}
+
+static unsigned long
+rzg2l_cpg_div2_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct div2_clk *d2clk = to_d2clk(hw);
+ u32 div, divs, val, vals;
+
+ val = readl(d2clk->base + GET_REG(d2clk->conf));
+ div = DIV_RSMASK(val, GET_SHIFT(d2clk->conf),
+ (BIT(GET_WIDTH(d2clk->conf)) - 1));
+ div = div2_clock_get_div(div, d2clk->dtable,
+ (BIT(GET_WIDTH(d2clk->conf)) - 1));
+
+ vals = readl(d2clk->base + GET_REG(d2clk->confs));
+ divs = DIV_RSMASK(val, GET_SHIFT(d2clk->confs),
+ (BIT(GET_WIDTH(d2clk->confs)) - 1));
+ divs = div2_clock_get_div(divs, d2clk->dtables,
+ (BIT(GET_WIDTH(d2clk->confs)) - 1));
+
+ div = div * divs;
+
+ return DIV_ROUND_CLOSEST_ULL((u64)parent_rate, div);
+}
+
+static long rzg2l_cpg_div2_clk_round_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long *parent_rate)
+{
+ unsigned long best_diff = (unsigned long)-1;
+ unsigned int best_div, best_divs, div, divs;
+ struct div2_clk *d2clk = to_d2clk(hw);
+ unsigned long diff;
+ int i, j, n, ns;
+
+ n = BIT(GET_WIDTH(d2clk->conf)) - 1;
+ ns = BIT(GET_WIDTH(d2clk->confs)) - 1;
+ for (i = 0; i <= n; i++) {
+ for (j = 0; j <= ns; j++) {
+ div = div2_clock_get_div(i, d2clk->dtable, n);
+ divs = div2_clock_get_div(j, d2clk->dtables, ns);
+ diff = abs(*parent_rate - (rate * div * divs));
+ if (best_diff > diff) {
+ best_diff = diff;
+ best_div = div;
+ best_divs = divs;
+ }
+ }
+ }
+
+ return DIV_ROUND_CLOSEST_ULL((u64)*parent_rate, best_div * best_divs);
+}
+
+static int rzg2l_cpg_div2_clk_set_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate)
+{
+ unsigned long best_diff = (unsigned long)-1;
+ struct div2_clk *d2clk = to_d2clk(hw);
+ struct cpg_mssr_priv *priv = d2clk->priv;
+ unsigned int div, divs, val, vals, n, ns;
+ unsigned long diff, flags;
+ int i, j;
+
+ n = BIT(GET_WIDTH(d2clk->conf)) - 1;
+ ns = BIT(GET_WIDTH(d2clk->confs)) - 1;
+ for (i = 0; i <= n; i++) {
+ for (j = 0; j <= ns; j++) {
+ div = div2_clock_get_div(i, d2clk->dtable, n);
+ divs = div2_clock_get_div(j, d2clk->dtables, ns);
+ diff = abs(parent_rate - (rate * div * divs));
+ if (best_diff > diff) {
+ best_diff = diff;
+ val = i;
+ vals = j;
+ }
+ }
+ }
+
+ spin_lock_irqsave(&priv->rmw_lock, flags);
+
+ val = (val << GET_SHIFT(d2clk->conf)) |
+ (0x1 << (GET_SHIFT(d2clk->conf) + 16));
+ writel(val, d2clk->base + GET_REG(d2clk->conf));
+
+ vals = (vals << GET_SHIFT(d2clk->confs)) |
+ (0x1 << (GET_SHIFT(d2clk->confs) + 16));
+ writel(vals, d2clk->base + GET_REG(d2clk->confs));
+
+ spin_unlock_irqrestore(&priv->rmw_lock, flags);
+
+ return 0;
+}
+
+static const struct clk_ops rzg2l_cpg_div2_ops = {
+ .recalc_rate = rzg2l_cpg_div2_clk_recalc_rate,
+ .round_rate = rzg2l_cpg_div2_clk_round_rate,
+ .set_rate = rzg2l_cpg_div2_clk_set_rate,
+};
+
+static struct clk * __init
+rzg2l_cpg_div2_clk_register(const struct cpg_core_clk *core,
+ struct clk **clks,
+ void __iomem *base,
+ struct cpg_mssr_priv *priv)
+{
+ const struct clk *parent;
+ struct clk_init_data init;
+ struct div2_clk *d2clk;
+ struct device *dev = priv->dev;
+ struct clk *clk;
+ const char *parent_name;
+
+ parent = clks[core->parent & 0xffff];
+ if (IS_ERR(parent))
+ return ERR_CAST(parent);
+
+ d2clk = devm_kzalloc(dev, sizeof(*d2clk), GFP_KERNEL);
+ if (!d2clk) {
+ clk = ERR_PTR(-ENOMEM);
+ return NULL;
+ }
+
+ parent_name = __clk_get_name(parent);
+ init.name = core->name;
+ init.ops = &rzg2l_cpg_div2_ops;
+ init.flags = 0;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ d2clk->hw.init = &init;
+ d2clk->conf = core->conf;
+ d2clk->confs = core->confs;
+ d2clk->dtable = core->dtable;
+ d2clk->dtables = core->dtables;
+ d2clk->base = base;
+ d2clk->priv = priv;
+
+ clk = clk_register(NULL, &d2clk->hw);
+ if (IS_ERR(clk))
+ kfree(d2clk);
+
+ return clk;
+}
+
+struct pll_clk {
+ struct clk_hw hw;
+ unsigned int stby_conf;
+ unsigned int mon_conf;
+ unsigned int conf;
+ void __iomem *base;
+ struct cpg_mssr_priv *priv;
+ unsigned int type;
+};
+
+#define to_pll(_hw) container_of(_hw, struct pll_clk, hw)
+
+static unsigned long rzg2l_cpg_pll_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct pll_clk *pll_clk = to_pll(hw);
+ struct cpg_mssr_priv *priv = pll_clk->priv;
+ unsigned int val1, val2, val3;
+ unsigned int mult = 1;
+ unsigned int div = 1;
+
+ if (pll_clk->type == CLK_TYPE_SAM_PLL) {
+ val1 = readl(priv->base + GET_REG1(pll_clk->conf));
+ val2 = readl(priv->base + GET_REG2(pll_clk->conf));
+ mult = MDIV(val1) + KDIV(val1) / 65536;
+ div = PDIV(val1) * (1 << SDIV(val2));
+ } else if (pll_clk->type == CLK_TYPE_SI_PLL) {
+ val1 = readl(priv->base + GET_REG1(pll_clk->conf));
+ val2 = readl(priv->base + GET_REG2(pll_clk->conf));
+ val3 = readl(priv->base + GET_REG3(pll_clk->conf));
+
+ mult = INITIN(val3) + FRACIN(val2) / (0x1 << 24);
+ div = POSTDIV1(val1) * POSTDIV2(val1) * REFDIV(val1);
+ } else {
+ return 0;
+ }
+
+ return DIV_ROUND_CLOSEST_ULL((u64)parent_rate * mult, div);
+}
+
+static const struct clk_ops rzg2l_cpg_pll_ops = {
+ .recalc_rate = rzg2l_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 cpg_mssr_priv *priv)
+{
+ struct device *dev = priv->dev;
+ const struct clk *parent;
+ struct clk_init_data init;
+ const char *parent_name;
+ struct pll_clk *pll_clk;
+ struct clk *clk;
+
+ parent = clks[core->parent & 0xffff];
+ if (IS_ERR(parent))
+ return ERR_CAST(parent);
+
+ pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL);
+ if (!pll_clk) {
+ clk = ERR_PTR(-ENOMEM);
+ return NULL;
+ }
+
+ parent_name = __clk_get_name(parent);
+ init.name = core->name;
+ init.ops = &rzg2l_cpg_pll_ops;
+ init.flags = 0;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ pll_clk->hw.init = &init;
+ pll_clk->stby_conf = core->stby_conf;
+ pll_clk->mon_conf = core->mon_conf;
+ pll_clk->conf = core->conf;
+ pll_clk->base = base;
+ pll_clk->priv = priv;
+ pll_clk->type = core->type;
+
+ clk = clk_register(NULL, &pll_clk->hw);
+ if (IS_ERR(clk))
+ kfree(pll_clk);
+
+ return clk;
+}
+
+static struct clk
+*rzg2l_cpg_clk_src_twocell_get(struct of_phandle_args *clkspec,
+ void *data)
+{
+ unsigned int clkidx = clkspec->args[1];
+ struct cpg_mssr_priv *priv = data;
+ struct device *dev = priv->dev;
+ const char *type;
+ struct clk *clk;
+
+ switch (clkspec->args[0]) {
+ case CPG_CORE:
+ type = "core";
+ if (clkidx > priv->last_dt_core_clk) {
+ dev_err(dev, "Invalid %s clock index %u\n", type, clkidx);
+ return ERR_PTR(-EINVAL);
+ }
+ clk = priv->clks[clkidx];
+ break;
+
+ case CPG_MOD:
+ type = "module";
+ if (clkidx > priv->num_core_clks + priv->num_mod_clks) {
+ dev_err(dev, "Invalid %s clock index %u\n", type,
+ clkidx);
+ return ERR_PTR(-EINVAL);
+ }
+ clk = priv->clks[priv->num_core_clks + clkidx];
+ break;
+
+ default:
+ dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (IS_ERR(clk))
+ dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
+ PTR_ERR(clk));
+ else
+ dev_dbg(dev, "clock (%u, %u) is %pC at %lu Hz\n",
+ clkspec->args[0], clkspec->args[1], clk,
+ clk_get_rate(clk));
+ return clk;
+}
+
+static void __init
+rzg2l_cpg_register_core_clk(const struct cpg_core_clk *core,
+ const struct cpg_mssr_info *info,
+ struct cpg_mssr_priv *priv)
+{
+ struct clk *clk = ERR_PTR(-EOPNOTSUPP), *parent;
+ struct device *dev = priv->dev;
+ unsigned int id = core->id, div = core->div;
+ const char *parent_name;
+
+ WARN_DEBUG(id >= priv->num_core_clks);
+ WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+ if (!core->name) {
+ /* Skip NULLified clock */
+ return;
+ }
+
+ switch (core->type) {
+ case CLK_TYPE_IN:
+ clk = of_clk_get_by_name(priv->dev->of_node, core->name);
+ break;
+ case CLK_TYPE_FF:
+ WARN_DEBUG(core->parent >= priv->num_core_clks);
+ parent = priv->clks[core->parent];
+ if (IS_ERR(parent)) {
+ clk = parent;
+ goto fail;
+ }
+
+ parent_name = __clk_get_name(parent);
+ clk = clk_register_fixed_factor(NULL, core->name,
+ parent_name, CLK_SET_RATE_PARENT,
+ core->mult, div);
+ break;
+ case CLK_TYPE_SAM_PLL:
+ case CLK_TYPE_SI_PLL:
+ clk = rzg2l_cpg_pll_clk_register(core, priv->clks,
+ priv->base, priv);
+ break;
+ case CLK_TYPE_DIV:
+ clk = rzg2l_cpg_div_clk_register(core, priv->clks,
+ priv->base, priv);
+ break;
+ case CLK_TYPE_2DIV:
+ clk = rzg2l_cpg_div2_clk_register(core, priv->clks,
+ priv->base, priv);
+ break;
+ case CLK_TYPE_MUX:
+ clk = rzg2l_cpg_sell_clk_register(core, priv->base, priv);
+ break;
+ default:
+ goto fail;
+ };
+
+ if (IS_ERR_OR_NULL(clk))
+ goto fail;
+
+ dev_dbg(dev, "Core clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
+ priv->clks[id] = clk;
+ return;
+
+fail:
+ dev_err(dev, "Failed to register %s clock %s: %ld\n", "core",
+ core->name, PTR_ERR(clk));
+}
+
+/**
+ * struct mstp_clock - MSTP gating clock
+ * @hw: handle between common and hardware-specific interfaces
+ * @bit: 16bits register offset, 8bits ON/MON, 8bits RESET
+ * @priv: CPG/MSSR private data
+ */
+struct mstp_clock {
+ struct clk_hw hw;
+ u32 bit;
+ struct cpg_mssr_priv *priv;
+};
+
+#define to_mod_clock(_hw) container_of(_hw, struct mstp_clock, hw)
+
+static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
+{
+ struct mstp_clock *clock = to_mod_clock(hw);
+ struct cpg_mssr_priv *priv = clock->priv;
+ unsigned int reg = MSSR_OFF(clock->bit) * 4;
+ struct device *dev = priv->dev;
+ unsigned long flags;
+ unsigned int i;
+ u32 value;
+
+ if (clock->bit == 0) {
+ dev_dbg(dev, "%pC does not support ON/OFF\n", hw->clk);
+ return 0;
+ }
+
+ dev_dbg(dev, "CLK_ON %u@%u/%pC %s\n", CLK_ON_R(reg), clock->bit, hw->clk,
+ enable ? "ON" : "OFF");
+ spin_lock_irqsave(&priv->rmw_lock, flags);
+
+ if (enable)
+ value = (MSSR_ON(clock->bit) << 16) | MSSR_ON(clock->bit);
+ else
+ value = MSSR_ON(clock->bit) << 16;
+ writel(value, priv->base + CLK_ON_R(reg));
+
+ spin_unlock_irqrestore(&priv->rmw_lock, flags);
+
+ if (!enable)
+ return 0;
+
+ for (i = 1000; i > 0; --i) {
+ if (((readl(priv->base + CLK_MON_R(reg)))
+ & MSSR_ON(clock->bit)))
+ break;
+ cpu_relax();
+ }
+
+ if (!i) {
+ dev_err(dev, "Failed to enable CLK_ON %p\n",
+ priv->base + CLK_ON_R(reg));
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int rzg2l_mod_clock_enable(struct clk_hw *hw)
+{
+ return rzg2l_mod_clock_endisable(hw, true);
+}
+
+static void rzg2l_mod_clock_disable(struct clk_hw *hw)
+{
+ rzg2l_mod_clock_endisable(hw, false);
+}
+
+static int rzg2l_mod_clock_is_enabled(struct clk_hw *hw)
+{
+ struct mstp_clock *clock = to_mod_clock(hw);
+ struct cpg_mssr_priv *priv = clock->priv;
+ u32 value;
+
+ if (clock->bit == 0) {
+ dev_dbg(priv->dev, "%pC does not support ON/OFF\n", hw->clk);
+ return 1;
+ }
+
+ value = readl(priv->base + CLK_MON_R(MSSR_OFF(clock->bit) * 4));
+
+ return !(value & (MSSR_ON(clock->bit)));
+}
+
+static const struct clk_ops rzg2l_mod_clock_ops = {
+ .enable = rzg2l_mod_clock_enable,
+ .disable = rzg2l_mod_clock_disable,
+ .is_enabled = rzg2l_mod_clock_is_enabled,
+};
+
+static void __init
+rzg2l_cpg_register_mod_clk(const struct mssr_mod_clk *mod,
+ const struct cpg_mssr_info *info,
+ struct cpg_mssr_priv *priv)
+{
+ struct mstp_clock *clock = NULL;
+ struct device *dev = priv->dev;
+ unsigned int id = mod->id;
+ struct clk_init_data init;
+ struct clk *parent, *clk;
+ const char *parent_name;
+ unsigned int i;
+
+ WARN_DEBUG(id < priv->num_core_clks);
+ WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
+ WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
+ WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+ if (!mod->name) {
+ /* Skip NULLified clock */
+ return;
+ }
+
+ parent = priv->clks[mod->parent];
+ if (IS_ERR(parent)) {
+ clk = parent;
+ goto fail;
+ }
+
+ clock = devm_kzalloc(dev, sizeof(*clock), GFP_KERNEL);
+ if (!clock) {
+ clk = ERR_PTR(-ENOMEM);
+ goto fail;
+ }
+
+ init.name = mod->name;
+ init.ops = &rzg2l_mod_clock_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ for (i = 0; i < info->num_crit_mod_clks; i++)
+ if (id == info->crit_mod_clks[i]) {
+ dev_dbg(dev, "CPG %s setting CLK_IS_CRITICAL\n",
+ mod->name);
+ init.flags |= CLK_IS_CRITICAL;
+ break;
+ }
+
+ parent_name = __clk_get_name(parent);
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+
+ clock->bit = mod->bit;
+ clock->priv = priv;
+ clock->hw.init = &init;
+
+ clk = clk_register(NULL, &clock->hw);
+ if (IS_ERR(clk))
+ goto fail;
+
+ dev_dbg(dev, "Module clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
+ priv->clks[id] = clk;
+ return;
+
+fail:
+ dev_err(dev, "Failed to register %s clock %s: %ld\n", "module",
+ mod->name, PTR_ERR(clk));
+ kfree(clock);
+}
+
+#ifdef CONFIG_RESET_CONTROLLER
+
+#define rcdev_to_priv(x) container_of(x, struct cpg_mssr_priv, rcdev)
+
+static int rzg2l_cpg_reset(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+ const struct cpg_mssr_info *info = priv->info;
+ unsigned int reg = MSSR_OFF(info->mod_clks[id].bit) * 0x4;
+ u32 dis = MSSR_RES(info->mod_clks[id].bit);
+ u32 we = dis << 16;
+
+ dev_dbg(rcdev->dev, "reset %u%02u\n", reg, info->mod_clks[id].bit);
+
+ /* Reset module */
+ writel(we, priv->base + CLK_RST_R(reg));
+
+ /* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
+ udelay(35);
+
+ /* Release module from reset state */
+ writel(we | dis, priv->base + CLK_RST_R(reg));
+
+ return 0;
+}
+
+static int rzg2l_cpg_assert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+ const struct cpg_mssr_info *info = priv->info;
+ unsigned int reg = MSSR_OFF(info->mod_clks[id].bit) * 0x4;
+ u32 value = MSSR_RES(info->mod_clks[id].bit) << 16;
+
+ dev_dbg(rcdev->dev, "assert %u%02u\n", reg, info->mod_clks[id].bit);
+
+ writel(value, priv->base + CLK_RST_R(reg));
+ return 0;
+}
+
+static int rzg2l_cpg_deassert(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+ const struct cpg_mssr_info *info = priv->info;
+ unsigned int reg = MSSR_OFF(info->mod_clks[id].bit) * 0x4;
+ u32 dis = MSSR_RES(info->mod_clks[id].bit);
+ u32 value = (dis << 16) | dis;
+
+ dev_dbg(rcdev->dev, "deassert %u%02u\n", reg, info->mod_clks[id].bit);
+
+ writel(value, priv->base + CLK_RST_R(reg));
+ return 0;
+}
+
+static int rzg2l_cpg_status(struct reset_controller_dev *rcdev,
+ unsigned long id)
+{
+ struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+ const struct cpg_mssr_info *info = priv->info;
+ unsigned int reg = MSSR_OFF(info->mod_clks[id].bit) * 0x4;
+ u32 bitmask = MSSR_RES(info->mod_clks[id].bit);
+
+ return !(readl(priv->base + CLK_MRST_R(reg)) & bitmask);
+}
+
+static const struct reset_control_ops rzg2l_cpg_reset_ops = {
+ .reset = rzg2l_cpg_reset,
+ .assert = rzg2l_cpg_assert,
+ .deassert = rzg2l_cpg_deassert,
+ .status = rzg2l_cpg_status,
+};
+
+static int rzg2l_cpg_reset_xlate(struct reset_controller_dev *rcdev,
+ const struct of_phandle_args *reset_spec)
+{
+ unsigned int id = reset_spec->args[0];
+
+ if (id >= rcdev->nr_resets) {
+ dev_err(rcdev->dev, "Invalid reset index %u\n", id);
+ return -EINVAL;
+ }
+
+ return id;
+}
+
+static int rzg2l_cpg_reset_controller_register(struct cpg_mssr_priv *priv)
+{
+ priv->rcdev.ops = &rzg2l_cpg_reset_ops;
+ priv->rcdev.of_node = priv->dev->of_node;
+ priv->rcdev.dev = priv->dev;
+ priv->rcdev.of_reset_n_cells = 1;
+ priv->rcdev.of_xlate = rzg2l_cpg_reset_xlate;
+ priv->rcdev.nr_resets = priv->num_mod_clks;
+
+ return devm_reset_controller_register(priv->dev, &priv->rcdev);
+}
+
+#else /* !CONFIG_RESET_CONTROLLER */
+static int rzg2l_cpg_reset_controller_register(struct cpg_mssr_priv *priv)
+{
+ return 0;
+}
+#endif /* !CONFIG_RESET_CONTROLLER */
+
+static bool rzg2l_cpg_is_pm_clk(const struct of_phandle_args *clkspec)
+{
+ if (clkspec->args_count != 2)
+ return false;
+
+ switch (clkspec->args[0]) {
+ case CPG_MOD:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+static int rzg2l_cpg_attach_dev(struct generic_pm_domain *unused, struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct of_phandle_args clkspec;
+ struct clk *clk;
+ int error;
+ int i = 0;
+
+ while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
+ &clkspec)) {
+ if (rzg2l_cpg_is_pm_clk(&clkspec))
+ goto found;
+
+ of_node_put(clkspec.np);
+ i++;
+ }
+
+ return 0;
+
+found:
+ clk = of_clk_get_from_provider(&clkspec);
+ of_node_put(clkspec.np);
+
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ error = pm_clk_create(dev);
+ if (error)
+ goto fail_put;
+
+ error = pm_clk_add_clk(dev, clk);
+ if (error)
+ goto fail_destroy;
+
+ return 0;
+
+fail_destroy:
+ pm_clk_destroy(dev);
+fail_put:
+ clk_put(clk);
+ return error;
+}
+
+static void rzg2l_cpg_detach_dev(struct generic_pm_domain *unused, struct device *dev)
+{
+ if (!pm_clk_no_clocks(dev))
+ pm_clk_destroy(dev);
+}
+
+static int __init rzg2l_cpg_add_clk_domain(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct generic_pm_domain *genpd;
+
+ genpd = devm_kzalloc(dev, sizeof(*genpd), GFP_KERNEL);
+ if (!genpd)
+ return -ENOMEM;
+
+ genpd->name = np->name;
+ genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |
+ GENPD_FLAG_ACTIVE_WAKEUP;
+ genpd->attach_dev = rzg2l_cpg_attach_dev;
+ genpd->detach_dev = rzg2l_cpg_detach_dev;
+ pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
+
+ of_genpd_add_provider_simple(np, genpd);
+ return 0;
+}
+
+static int __init rzg2l_cpg_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ const struct cpg_mssr_info *info;
+ struct cpg_mssr_priv *priv;
+ unsigned int nclks, i;
+ struct resource *res;
+ struct clk **clks;
+ int error;
+
+ info = of_device_get_match_data(dev);
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = dev;
+ priv->info = info;
+ spin_lock_init(&priv->rmw_lock);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ nclks = info->num_total_core_clks + info->num_hw_mod_clks;
+ clks = devm_kmalloc_array(dev, nclks, sizeof(*clks), GFP_KERNEL);
+ if (!clks)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->clks = clks;
+ priv->num_core_clks = info->num_total_core_clks;
+ priv->num_mod_clks = info->num_hw_mod_clks;
+ priv->last_dt_core_clk = info->last_dt_core_clk;
+
+ for (i = 0; i < nclks; i++)
+ clks[i] = ERR_PTR(-ENOENT);
+
+ for (i = 0; i < info->num_core_clks; i++)
+ rzg2l_cpg_register_core_clk(&info->core_clks[i], info, priv);
+
+ for (i = 0; i < info->num_mod_clks; i++)
+ rzg2l_cpg_register_mod_clk(&info->mod_clks[i], info, priv);
+
+ error = of_clk_add_provider(np, rzg2l_cpg_clk_src_twocell_get, priv);
+ if (error)
+ return error;
+
+ error = devm_add_action_or_reset(dev, rzg2l_cpg_del_clk_provider, np);
+ if (error)
+ return error;
+
+ error = rzg2l_cpg_add_clk_domain(dev);
+ if (error)
+ return error;
+
+ error = rzg2l_cpg_reset_controller_register(priv);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static const struct of_device_id rzg2l_cpg_match[] = {
+ { /* sentinel */ }
+};
+
+static struct platform_driver rzg2l_cpg_driver = {
+ .driver = {
+ .name = "rzg2l-cpg",
+ .of_match_table = rzg2l_cpg_match,
+ },
+};
+
+static int __init rzg2l_cpg_init(void)
+{
+ return platform_driver_probe(&rzg2l_cpg_driver, rzg2l_cpg_probe);
+}
+
+subsys_initcall(rzg2l_cpg_init);
+
+MODULE_DESCRIPTION("Renesas RZ/G2L CPG Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.h b/drivers/clk/renesas/renesas-rzg2l-cpg.h
new file mode 100644
index 000000000000..8dce6b5546b1
--- /dev/null
+++ b/drivers/clk/renesas/renesas-rzg2l-cpg.h
@@ -0,0 +1,221 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RZ/G2L Clock Pulse Generator
+ *
+ * Copyright (C) 2021 Renesas Electronics Corp.
+ *
+ */
+
+#ifndef __RENESAS_RZG2L_CPG_H__
+#define __RENESAS_RZG2L_CPG_H__
+
+/* Register offset */
+/* n : 0, 1, 2 : PLL1, PLL4, PLL6 */
+#define PLL146_CLK1_R(n) (0x04 + (16 * n))
+#define PLL146_CLK2_R(n) (0x08 + (16 * n))
+#define PLL146_MON_R(n) (0x0C + (16 * n))
+#define PLL146_STBY_R(n) (0x00 + (16 * n))
+
+/* n : 0, 1, 2 : PLL2, PLL3, PLL5 */
+#define PLL235_CLK1_R(n) (0x104 + (32 * n))
+#define PLL235_CLK3_R(n) (0x10c + (32 * n))
+#define PLL235_CLK4_R(n) (0x110 + (32 * n))
+#define PLL235_MON_R(n) (0x11C + (32 * n))
+#define PLL235_STBY_R(n) (0x100 + (32 * n))
+
+#define PLL1_DIV_R (0x200)
+#define PLL2_DIV_R (0x204)
+#define PLL3A_DIV_R (0x208)
+#define PLL3B_DIV_R (0x20c)
+#define PLL6_DIV_R (0x210)
+#define PL2SDHI_SEL_R (0x218)
+#define CLK_STATUS_R (0x280)
+#define CA55_SSEL_R (0x400)
+#define PL2_SSEL_R (0x404)
+#define PL3_SSEL_R (0x408)
+#define PL4_DSEL_R (0x21C)
+#define PL5_SSEL_R (0x410)
+#define PL6_SSEL_R (0x414)
+#define PL6_ETH_SSEL_R (0x418)
+#define PL5_SDIV_R (0x420)
+#define OTHERFUNC1_R (0xBE8)
+#define CLK_ON_R(reg) (0x500 + reg)
+#define CLK_MON_R(reg) (0x680 + reg)
+#define CLK_RST_R(reg) (0x800 + reg)
+#define CLK_MRST_R(reg) (0x980 + reg)
+
+#define SEL_PLL1 (CA55_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL2_1 (PL2_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL2_2 (PL2_SSEL_R << 20 | 4 << 12 | 1 << 8)
+#define SEL_PLL3_1 (PL3_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL3_2 (PL3_SSEL_R << 20 | 4 << 12 | 1 << 8)
+#define SEL_PLL3_3 (PL3_SSEL_R << 20 | 8 << 12 | 1 << 8)
+#define SEL_PLL4 (PL4_DSEL_R << 20 | 8 << 12 | 1 << 8)
+#define SEL_PLL5_1 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL5_2 (PL5_SSEL_R << 20 | 4 << 12 | 1 << 8)
+#define SEL_PLL5_3 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL5_4 (OTHERFUNC1_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL6_1 (PL6_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_PLL6_2 (PL6_ETH_SSEL_R << 20 | 0 << 12 | 1 << 8)
+#define SEL_ETH (PL6_ETH_SSEL_R << 20 | 4 << 12 | 1 << 8)
+#define SEL_G1_1 (PL6_SSEL_R << 20 | 4 << 12 | 1 << 8)
+#define SEL_G1_2 (PL6_SSEL_R << 20 | 8 << 12 | 1 << 8)
+#define SEL_G2 (PL6_SSEL_R << 20 | 12 << 12 | 1 << 8)
+#define SEL_SDHI0 (PL2SDHI_SEL_R << 20 | 0 << 12 | 2 << 8)
+#define SEL_SDHI1 (PL2SDHI_SEL_R << 20 | 4 << 12 | 2 << 8)
+#define DIVPL1 (PLL1_DIV_R << 20 | 0 << 12 | 2 << 8)
+#define DIVPL2A (PLL2_DIV_R << 20 | 0 << 12 | 3 << 8)
+#define DIVPL2B (PLL2_DIV_R << 20 | 4 << 12 | 3 << 8)
+#define DIVPL2C (PLL2_DIV_R << 20 | 8 << 12 | 3 << 8)
+#define DIVDSILPCL (PLL2_DIV_R << 20 | 12 << 12 | 2 << 8)
+#define DIVPL3A (PLL3A_DIV_R << 20 | 0 << 12 | 3 << 8)
+#define DIVPL3B (PLL3A_DIV_R << 20 | 4 << 12 | 3 << 8)
+#define DIVPL3C (PLL3A_DIV_R << 20 | 8 << 12 | 3 << 8)
+#define DIVPL3CLK200FIX (PLL3B_DIV_R << 20 | 0 << 12 | 3 << 8)
+#define DIVGPU (PLL6_DIV_R << 20 | 0 << 12 | 2 << 8)
+#define DIVDSIB (PL5_SDIV_R << 20 | 8 << 12 | 4 << 8)
+#define DIVDSIA (PL5_SDIV_R << 20 | 0 << 12 | 2 << 8)
+
+#define PLL146_STBY(n) (PLL146_STBY_R(n) << 20 | 2 << 16 | 0 << 12)
+#define PLL146_MON(n) (PLL146_MON_R(n) << 20 | 4 << 16 | 0 << 12)
+#define PLL235_STBY(n) (PLL235_STBY_R(n) << 20 | 2 << 16 | 0 << 12)
+#define PLL235_MON(n) (PLL235_MON_R(n) << 20 | 4 << 16 | 0 << 12)
+
+#define PLL146_CONF(n) (PLL146_CLK1_R(n) << 22 | PLL146_CLK2_R(n) << 12 | 0)
+#define PLL235_CONF(n) (PLL235_CLK1_R(n) << 22 | PLL235_CLK3_R(n) << 12 | PLL235_CLK4_R(n))
+
+#define GET_REG1(val) ((val >> 22) & 0x3ff)
+#define GET_REG2(val) ((val >> 12) & 0x3ff)
+#define GET_REG3(val) (val & 0x3ff)
+
+#define MSSR(off, on, res) ((off & 0xffff) << 16 | \
+ (on & 0xff) << 8 | (res & 0xff))
+#define MSSR_OFF(val) ((val >> 16) & 0xffff)
+#define MSSR_ON(val) ((val >> 8) & 0xff)
+#define MSSR_RES(val) (val & 0xff)
+
+/*
+ * Definitions of CPG Core Clocks
+ *
+ * These include:
+ * - Clock outputs exported to DT
+ * - External input clocks
+ * - Internal CPG clocks
+ */
+struct cpg_core_clk {
+ const char *name;
+ unsigned int id;
+ unsigned int parent;
+ unsigned int div;
+ unsigned int mult;
+ unsigned int type;
+ unsigned int conf;
+ const struct clk_div_table *dtable;
+ int flag;
+ const char * const *parent_names;
+ int num_parents;
+
+ /* used for clocks with two configs */
+ unsigned int confs;
+ const struct clk_div_table *dtables;
+ unsigned int stby_conf;
+ unsigned int mon_conf;
+};
+
+enum clk_types {
+ /* Generic */
+ CLK_TYPE_IN, /* External Clock Input */
+ CLK_TYPE_FF, /* Fixed Factor Clock */
+ CLK_TYPE_SAM_PLL,
+ CLK_TYPE_SI_PLL,
+
+ /* Clock with divider */
+ CLK_TYPE_DIV,
+ CLK_TYPE_2DIV,
+
+ /* Clock with selector */
+ CLK_TYPE_MUX,
+
+ /* Custom definitions start here */
+ CLK_TYPE_CUSTOM,
+};
+
+#define DEF_TYPE(_name, _id, _type...) \
+ { .name = _name, .id = _id, .type = _type }
+#define DEF_BASE(_name, _id, _type, _parent...) \
+ DEF_TYPE(_name, _id, _type, .parent = _parent)
+#define DEF_PLL(_name, _id, _type, _parent, _conf, _stby_conf, _mon_conf) \
+ DEF_TYPE(_name, _id, _type, .parent = _parent, .conf = _conf, \
+ .stby_conf = _stby_conf, .mon_conf = _mon_conf)
+#define DEF_INPUT(_name, _id) \
+ DEF_TYPE(_name, _id, CLK_TYPE_IN)
+#define DEF_FIXED(_name, _id, _parent, _mult, _div) \
+ DEF_BASE(_name, _id, CLK_TYPE_FF, _parent, .div = _div, .mult = _mult)
+#define DEF_DIV(_name, _id, _parent, _conf, _dtable, _flag) \
+ DEF_TYPE(_name, _id, CLK_TYPE_DIV, .conf = _conf, \
+ .parent = _parent, .dtable = _dtable, .flag = _flag)
+#define DEF_MUX(_name, _id, _conf, _parent_names, _num_parents, _flag) \
+ DEF_TYPE(_name, _id, CLK_TYPE_MUX, .conf = _conf, \
+ .parent_names = _parent_names, \
+ .num_parents = _num_parents, .flag = _flag)
+/* Clock with two dividers */
+#define DEF_2DIV(_name, _id, _parent, _conf, _confs, _dtable, _dtables, _flag) \
+ DEF_TYPE(_name, _id, CLK_TYPE_2DIV, .parent = _parent, \
+ .conf = _conf, .confs = _confs, \
+ .dtable = _dtable, .dtables = _dtables, .flag = _flag)
+
+/*
+ * Definitions of Module Clocks
+ * @name: handle between common and hardware-specific interfaces
+ * @id: clock index in array containing all Core and Module Clocks
+ * @parent: id of parent clock
+ * @bit: 16bits register offset, 8bits ON/MON, 8bits RESET
+ */
+struct mssr_mod_clk {
+ const char *name;
+ unsigned int id;
+ unsigned int parent;
+ unsigned int bit;
+};
+
+#define DEF_MOD(_name, _id, _parent, _bit) \
+ { .name = _name, .id = MOD_CLK_BASE + _id, .parent = _parent,\
+ .bit = _bit }
+
+/**
+ * SoC-specific CPG/MSSR Description
+ *
+ * @core_clks: Array of Core Clock definitions
+ * @num_core_clks: Number of entries in core_clks[]
+ * @last_dt_core_clk: ID of the last Core Clock exported to DT
+ * @num_total_core_clks: Total number of Core Clocks (exported + internal)
+ *
+ * @pll_info: array of PLL register info
+ * @pll_info_size: Total number of PLL registers info
+ *
+ * @mod_clks: Array of Module Clock definitions
+ * @num_mod_clks: Number of entries in mod_clks[]
+ * @num_hw_mod_clks: Number of Module Clocks supported by the hardware
+ *
+ * @crit_mod_clks: Array with Module Clock IDs of critical clocks that
+ * should not be disabled without a knowledgeable driver
+ * @num_crit_mod_clks: Number of entries in crit_mod_clks[]
+ */
+struct cpg_mssr_info {
+ /* Core Clocks */
+ const struct cpg_core_clk *core_clks;
+ unsigned int num_core_clks;
+ unsigned int last_dt_core_clk;
+ unsigned int num_total_core_clks;
+
+ /* Module Clocks */
+ const struct mssr_mod_clk *mod_clks;
+ unsigned int num_mod_clks;
+ unsigned int num_hw_mod_clks;
+
+ /* Critical Module Clocks that should not be disabled */
+ const unsigned int *crit_mod_clks;
+ unsigned int num_crit_mod_clks;
+};
+
+#endif
--
2.17.1
Hi Prabhakar,
On Fri, May 14, 2021 at 9:24 PM Lad Prabhakar
<[email protected]> wrote:
> Add CPG core wrapper for RZ/G2L family.
>
> Based on a patch in the BSP by Binh Nguyen
> <[email protected]>.
>
> Signed-off-by: Lad Prabhakar <[email protected]>
> Reviewed-by: Biju Das <[email protected]>
Thanks for your patch!
> --- a/drivers/clk/renesas/Kconfig
> +++ b/drivers/clk/renesas/Kconfig
> @@ -34,6 +34,10 @@ config CLK_RENESAS
> select CLK_R9A06G032 if ARCH_R9A06G032
> select CLK_SH73A0 if ARCH_SH73A0
>
> +config CLK_RENESAS_RZG2L
> + bool "Renesas RZ/G2L SoC clock support" if COMPILE_TEST && !ARCH_RENESAS
> + default y if ARCH_RENESAS
Why do you need this symbol here, and why does it default to y?
I guess the plan is to share this by the RZ/G2L(C) and RZ/G2UL clock
drivers, so probably you want to move it to the family-specific
section below, like CLK_RCAR_GEN3_CPG.
> +
> if CLK_RENESAS
>
> # SoC
> diff --git a/drivers/clk/renesas/Makefile b/drivers/clk/renesas/Makefile
> index ef0d2bba92bf..e4f3d7fab67c 100644
> --- a/drivers/clk/renesas/Makefile
> +++ b/drivers/clk/renesas/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_CLK_RCAR_CPG_LIB) += rcar-cpg-lib.o
> obj-$(CONFIG_CLK_RCAR_GEN2_CPG) += rcar-gen2-cpg.o
> obj-$(CONFIG_CLK_RCAR_GEN3_CPG) += rcar-gen3-cpg.o
> obj-$(CONFIG_CLK_RCAR_USB2_CLOCK_SEL) += rcar-usb2-clock-sel.o
> +obj-$(CONFIG_CLK_RENESAS_RZG2L) += renesas-rzg2l-cpg.o
As CLK_RENESAS_RZG2L defaults to y, this is compiled by
default on ARCH_RENESAS.
>
> # Generic
> obj-$(CONFIG_CLK_RENESAS_CPG_MSSR) += renesas-cpg-mssr.o
> diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.c b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> new file mode 100644
> index 000000000000..dc54ffc6114c
> --- /dev/null
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> @@ -0,0 +1,958 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * RZ/G2L Clock Pulse Generator
> + *
> + * Copyright (C) 2021 Renesas Electronics Corp.
> + *
> + * Based on renesas-cpg-mssr.c
> + *
> + * Copyright (C) 2015 Glider bvba
> + * Copyright (C) 2013 Ideas On Board SPRL
> + * Copyright (C) 2015 Renesas Electronics Corp.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/clk/renesas.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/init.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_clock.h>
> +#include <linux/pm_domain.h>
> +#include <linux/psci.h>
Unused
> +#include <linux/reset-controller.h>
> +#include <linux/slab.h>
> +
> +#include <dt-bindings/clock/renesas-cpg-mssr.h>
> +
> +#include "renesas-rzg2l-cpg.h"
> +
> +#ifdef DEBUG
> +#define WARN_DEBUG(x) WARN_ON(x)
> +#else
> +#define WARN_DEBUG(x) do { } while (0)
> +#endif
> +
> +#define DIV_RSMASK(v, s, m) ((v >> s) & m)
> +#define GET_REG(val) ((val >> 20) & 0xfff)
> +#define GET_SHIFT(val) ((val >> 12) & 0xff)
> +#define GET_WIDTH(val) ((val >> 8) & 0xf)
> +
> +#define KDIV(val) DIV_RSMASK(val, 16, 0xffff)
> +#define MDIV(val) DIV_RSMASK(val, 6, 0x3ff)
> +#define PDIV(val) DIV_RSMASK(val, 0, 0x3f)
> +#define SDIV(val) DIV_RSMASK(val, 0, 0x7)
> +#define REFDIV(val) DIV_RSMASK(val, 8, 0x3f)
> +#define POSTDIV1(val) DIV_RSMASK(val, 0, 0x7)
> +#define POSTDIV2(val) DIV_RSMASK(val, 4, 0x7)
> +#define FRACIN(val) DIV_RSMASK(val, 8, 0xffffff)
> +#define INITIN(val) DIV_RSMASK(val, 16, 0xfff)
> +
> +/**
> + * Clock Pulse Generator Private Data
struct cpg_mssr_priv - Clock Pulse Generator Private Data
> + *
> + * @rcdev: Optional reset controller entity
> + * @dev: CPG/MSSR device
CPG?
> + * @base: CPG/MSSR register block base address
CPG?
> + * @rmw_lock: protects RMW register accesses
> + * @clks: Array containing all Core and Module Clocks
> + * @num_core_clks: Number of Core Clocks in clks[]
> + * @num_mod_clks: Number of Module Clocks in clks[]
> + * @last_dt_core_clk: ID of the last Core Clock exported to DT
> + * @notifiers: Notifier chain to save/restore clock state for system resume
> + * @info: Pointer to platform data
> + */
> +struct cpg_mssr_priv {
rzg2l_cpg_priv?
> +#ifdef CONFIG_RESET_CONTROLLER
> + struct reset_controller_dev rcdev;
> +#endif
> + struct device *dev;
> + void __iomem *base;
> + spinlock_t rmw_lock;
> +
> + struct clk **clks;
> + unsigned int num_core_clks;
> + unsigned int num_mod_clks;
> + unsigned int last_dt_core_clk;
> +
> + struct raw_notifier_head notifiers;
> + const struct cpg_mssr_info *info;
> +};
> +struct div2_clk {
> + struct clk_hw hw;
> + unsigned int conf;
> + const struct clk_div_table *dtable;
> + unsigned int confs;
> + const struct clk_div_table *dtables;
Please don't interleave pointers and integers on a 64-bit platform,
as it requires padding to keep the pointers naturally aligned.
Same for struct pll_clk below.
> + void __iomem *base;
> + struct cpg_mssr_priv *priv;
> +};
> +
> +#define to_d2clk(_hw) container_of(_hw, struct div2_clk, hw)
> +
> +static unsigned int div2_clock_get_div(unsigned int val,
> + const struct clk_div_table *t,
> + int length)
unsigned int
> +{
> + int i;
unsigned int (for all positive loop counters)
> +
> + for (i = 0; i <= length; i++)
> + if (val == t[i].val)
> + return t[i].div;
> +
> + /* return div=1 if failed */
> + return 1;
> +}
> +static long rzg2l_cpg_div2_clk_round_rate(struct clk_hw *hw,
> + unsigned long rate,
> + unsigned long *parent_rate)
Please implement .determine_rate() instead of .round_rate() in new
drivers.
> +{
> + unsigned long best_diff = (unsigned long)-1;
> + unsigned int best_div, best_divs, div, divs;
> + struct div2_clk *d2clk = to_d2clk(hw);
> + unsigned long diff;
> + int i, j, n, ns;
> +
> + n = BIT(GET_WIDTH(d2clk->conf)) - 1;
> + ns = BIT(GET_WIDTH(d2clk->confs)) - 1;
> + for (i = 0; i <= n; i++) {
> + for (j = 0; j <= ns; j++) {
> + div = div2_clock_get_div(i, d2clk->dtable, n);
> + divs = div2_clock_get_div(j, d2clk->dtables, ns);
> + diff = abs(*parent_rate - (rate * div * divs));
> + if (best_diff > diff) {
> + best_diff = diff;
> + best_div = div;
> + best_divs = divs;
> + }
> + }
> + }
> +
> + return DIV_ROUND_CLOSEST_ULL((u64)*parent_rate, best_div * best_divs);
> +}
> +/**
> + * struct mstp_clock - MSTP gating clock
> + * @hw: handle between common and hardware-specific interfaces
> + * @bit: 16bits register offset, 8bits ON/MON, 8bits RESET
> + * @priv: CPG/MSSR private data
> + */
> +struct mstp_clock {
> + struct clk_hw hw;
> + u32 bit;
I think the code accessing this field can be simplified by not packing
everything into a 32-bit value:
u16 off;
u8 onoff;
u8 reset;
> + struct cpg_mssr_priv *priv;
> +};
> diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.h b/drivers/clk/renesas/renesas-rzg2l-cpg.h
> new file mode 100644
> index 000000000000..8dce6b5546b1
> --- /dev/null
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.h
> @@ -0,0 +1,221 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * RZ/G2L Clock Pulse Generator
> + *
> + * Copyright (C) 2021 Renesas Electronics Corp.
> + *
> + */
> +
> +#ifndef __RENESAS_RZG2L_CPG_H__
> +#define __RENESAS_RZG2L_CPG_H__
> +
> +/* Register offset */
> +/* n : 0, 1, 2 : PLL1, PLL4, PLL6 */
> +#define PLL146_CLK1_R(n) (0x04 + (16 * n))
> +#define PLL146_CLK2_R(n) (0x08 + (16 * n))
> +#define PLL146_MON_R(n) (0x0C + (16 * n))
> +#define PLL146_STBY_R(n) (0x00 + (16 * n))
> +
> +/* n : 0, 1, 2 : PLL2, PLL3, PLL5 */
> +#define PLL235_CLK1_R(n) (0x104 + (32 * n))
> +#define PLL235_CLK3_R(n) (0x10c + (32 * n))
> +#define PLL235_CLK4_R(n) (0x110 + (32 * n))
> +#define PLL235_MON_R(n) (0x11C + (32 * n))
> +#define PLL235_STBY_R(n) (0x100 + (32 * n))
> +
> +#define PLL1_DIV_R (0x200)
> +#define PLL2_DIV_R (0x204)
> +#define PLL3A_DIV_R (0x208)
> +#define PLL3B_DIV_R (0x20c)
> +#define PLL6_DIV_R (0x210)
> +#define PL2SDHI_SEL_R (0x218)
> +#define CLK_STATUS_R (0x280)
> +#define CA55_SSEL_R (0x400)
> +#define PL2_SSEL_R (0x404)
> +#define PL3_SSEL_R (0x408)
> +#define PL4_DSEL_R (0x21C)
> +#define PL5_SSEL_R (0x410)
> +#define PL6_SSEL_R (0x414)
> +#define PL6_ETH_SSEL_R (0x418)
> +#define PL5_SDIV_R (0x420)
> +#define OTHERFUNC1_R (0xBE8)
> +#define CLK_ON_R(reg) (0x500 + reg)
> +#define CLK_MON_R(reg) (0x680 + reg)
> +#define CLK_RST_R(reg) (0x800 + reg)
> +#define CLK_MRST_R(reg) (0x980 + reg)
The register offsets are only used by renesas-rzg2l-cpg.c, so they
can be moved there.
> +
> +#define SEL_PLL1 (CA55_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL2_1 (PL2_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL2_2 (PL2_SSEL_R << 20 | 4 << 12 | 1 << 8)
> +#define SEL_PLL3_1 (PL3_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL3_2 (PL3_SSEL_R << 20 | 4 << 12 | 1 << 8)
> +#define SEL_PLL3_3 (PL3_SSEL_R << 20 | 8 << 12 | 1 << 8)
> +#define SEL_PLL4 (PL4_DSEL_R << 20 | 8 << 12 | 1 << 8)
> +#define SEL_PLL5_1 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL5_2 (PL5_SSEL_R << 20 | 4 << 12 | 1 << 8)
> +#define SEL_PLL5_3 (PL5_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL5_4 (OTHERFUNC1_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL6_1 (PL6_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_PLL6_2 (PL6_ETH_SSEL_R << 20 | 0 << 12 | 1 << 8)
> +#define SEL_ETH (PL6_ETH_SSEL_R << 20 | 4 << 12 | 1 << 8)
> +#define SEL_G1_1 (PL6_SSEL_R << 20 | 4 << 12 | 1 << 8)
> +#define SEL_G1_2 (PL6_SSEL_R << 20 | 8 << 12 | 1 << 8)
> +#define SEL_G2 (PL6_SSEL_R << 20 | 12 << 12 | 1 << 8)
> +#define SEL_SDHI0 (PL2SDHI_SEL_R << 20 | 0 << 12 | 2 << 8)
> +#define SEL_SDHI1 (PL2SDHI_SEL_R << 20 | 4 << 12 | 2 << 8)
> +#define DIVPL1 (PLL1_DIV_R << 20 | 0 << 12 | 2 << 8)
> +#define DIVPL2A (PLL2_DIV_R << 20 | 0 << 12 | 3 << 8)
> +#define DIVPL2B (PLL2_DIV_R << 20 | 4 << 12 | 3 << 8)
> +#define DIVPL2C (PLL2_DIV_R << 20 | 8 << 12 | 3 << 8)
> +#define DIVDSILPCL (PLL2_DIV_R << 20 | 12 << 12 | 2 << 8)
> +#define DIVPL3A (PLL3A_DIV_R << 20 | 0 << 12 | 3 << 8)
> +#define DIVPL3B (PLL3A_DIV_R << 20 | 4 << 12 | 3 << 8)
> +#define DIVPL3C (PLL3A_DIV_R << 20 | 8 << 12 | 3 << 8)
> +#define DIVPL3CLK200FIX (PLL3B_DIV_R << 20 | 0 << 12 | 3 << 8)
> +#define DIVGPU (PLL6_DIV_R << 20 | 0 << 12 | 2 << 8)
> +#define DIVDSIB (PL5_SDIV_R << 20 | 8 << 12 | 4 << 8)
> +#define DIVDSIA (PL5_SDIV_R << 20 | 0 << 12 | 2 << 8)
> +
> +#define PLL146_STBY(n) (PLL146_STBY_R(n) << 20 | 2 << 16 | 0 << 12)
> +#define PLL146_MON(n) (PLL146_MON_R(n) << 20 | 4 << 16 | 0 << 12)
> +#define PLL235_STBY(n) (PLL235_STBY_R(n) << 20 | 2 << 16 | 0 << 12)
> +#define PLL235_MON(n) (PLL235_MON_R(n) << 20 | 4 << 16 | 0 << 12)
> +
> +#define PLL146_CONF(n) (PLL146_CLK1_R(n) << 22 | PLL146_CLK2_R(n) << 12 | 0)
> +#define PLL235_CONF(n) (PLL235_CLK1_R(n) << 22 | PLL235_CLK3_R(n) << 12 | PLL235_CLK4_R(n))
> +
> +#define GET_REG1(val) ((val >> 22) & 0x3ff)
> +#define GET_REG2(val) ((val >> 12) & 0x3ff)
> +#define GET_REG3(val) (val & 0x3ff)
The GET_REG() macros are only used by renesas-rzg2l-cpg.c.
> +
> +#define MSSR(off, on, res) ((off & 0xffff) << 16 | \
> + (on & 0xff) << 8 | (res & 0xff))
> +#define MSSR_OFF(val) ((val >> 16) & 0xffff)
> +#define MSSR_ON(val) ((val >> 8) & 0xff)
> +#define MSSR_RES(val) (val & 0xff)
Can be removed after mstp_clock.bit split.
> +/*
> + * Definitions of Module Clocks
> + * @name: handle between common and hardware-specific interfaces
> + * @id: clock index in array containing all Core and Module Clocks
> + * @parent: id of parent clock
> + * @bit: 16bits register offset, 8bits ON/MON, 8bits RESET
> + */
> +struct mssr_mod_clk {
rzg2l_mod_clk?
> + const char *name;
> + unsigned int id;
> + unsigned int parent;
> + unsigned int bit;
Same comment as for mstp_clock.bit.
> +};
> +
> +#define DEF_MOD(_name, _id, _parent, _bit) \
> + { .name = _name, .id = MOD_CLK_BASE + _id, .parent = _parent,\
> + .bit = _bit }
> +
> +/**
> + * SoC-specific CPG/MSSR Description
> + *
> + * @core_clks: Array of Core Clock definitions
> + * @num_core_clks: Number of entries in core_clks[]
> + * @last_dt_core_clk: ID of the last Core Clock exported to DT
> + * @num_total_core_clks: Total number of Core Clocks (exported + internal)
> + *
> + * @pll_info: array of PLL register info
> + * @pll_info_size: Total number of PLL registers info
> + *
> + * @mod_clks: Array of Module Clock definitions
> + * @num_mod_clks: Number of entries in mod_clks[]
> + * @num_hw_mod_clks: Number of Module Clocks supported by the hardware
> + *
> + * @crit_mod_clks: Array with Module Clock IDs of critical clocks that
> + * should not be disabled without a knowledgeable driver
> + * @num_crit_mod_clks: Number of entries in crit_mod_clks[]
> + */
> +struct cpg_mssr_info {
rzg2l_cpg_info?
> + /* Core Clocks */
> + const struct cpg_core_clk *core_clks;
> + unsigned int num_core_clks;
> + unsigned int last_dt_core_clk;
> + unsigned int num_total_core_clks;
> +
> + /* Module Clocks */
> + const struct mssr_mod_clk *mod_clks;
> + unsigned int num_mod_clks;
> + unsigned int num_hw_mod_clks;
> +
> + /* Critical Module Clocks that should not be disabled */
> + const unsigned int *crit_mod_clks;
> + unsigned int num_crit_mod_clks;
> +};
> +
> +#endif
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
Hi Prabhakar,
On Fri, May 14, 2021 at 9:24 PM Lad Prabhakar
<[email protected]> wrote:
> Add CPG core wrapper for RZ/G2L family.
>
> Based on a patch in the BSP by Binh Nguyen
> <[email protected]>.
>
> Signed-off-by: Lad Prabhakar <[email protected]>
> Reviewed-by: Biju Das <[email protected]>
> --- /dev/null
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> +static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
> +{
> + struct mstp_clock *clock = to_mod_clock(hw);
> + struct cpg_mssr_priv *priv = clock->priv;
> + unsigned int reg = MSSR_OFF(clock->bit) * 4;
The "* 4" here makes it difficult to review the module clock tables.
E.g.
DEF_MOD("gic", R9A07G044_CLK_GIC600,
R9A07G044_CLK_P1,
MSSR(5, BIT(0), (BIT(0) | BIT(1)))),
The "5" means the CLK_ON_GIC600 register is at offset CLK_ON_R(5 * 4)
= 0x514. Removing the "* 4" means you could use
"MSSR(0x14, BIT(0), (BIT(0) | BIT(1))" instead.
Unless it has unpleasant side effects, I'd even consider putting
the full CLK_ON offset there, i.e.
"MSSR(0x514, BIT(0), (BIT(0) | BIT(1))" and change the macros like:
#define CLK_ON_R(reg) (reg)
#define CLK_MON_R(reg) (0x680 - 0x500 + (reg))
> --- /dev/null
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.h
> +#define CLK_ON_R(reg) (0x500 + reg)
> +#define CLK_MON_R(reg) (0x680 + reg)
> +#define CLK_RST_R(reg) (0x800 + reg)
> +#define CLK_MRST_R(reg) (0x980 + reg)
The last three don't seem to be documented?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
Hi Geert,
On Thu, May 27, 2021 at 1:04 PM Geert Uytterhoeven <[email protected]> wrote:
>
> Hi Prabhakar,
>
> On Fri, May 14, 2021 at 9:24 PM Lad Prabhakar
> <[email protected]> wrote:
> > Add CPG core wrapper for RZ/G2L family.
> >
> > Based on a patch in the BSP by Binh Nguyen
> > <[email protected]>.
> >
> > Signed-off-by: Lad Prabhakar <[email protected]>
> > Reviewed-by: Biju Das <[email protected]>
>
> > --- /dev/null
> > +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
>
> > +static int rzg2l_mod_clock_endisable(struct clk_hw *hw, bool enable)
> > +{
> > + struct mstp_clock *clock = to_mod_clock(hw);
> > + struct cpg_mssr_priv *priv = clock->priv;
> > + unsigned int reg = MSSR_OFF(clock->bit) * 4;
>
> The "* 4" here makes it difficult to review the module clock tables.
>
> E.g.
>
> DEF_MOD("gic", R9A07G044_CLK_GIC600,
> R9A07G044_CLK_P1,
> MSSR(5, BIT(0), (BIT(0) | BIT(1)))),
>
> The "5" means the CLK_ON_GIC600 register is at offset CLK_ON_R(5 * 4)
> = 0x514. Removing the "* 4" means you could use
> "MSSR(0x14, BIT(0), (BIT(0) | BIT(1))" instead.
>
> Unless it has unpleasant side effects, I'd even consider putting
> the full CLK_ON offset there, i.e.
> "MSSR(0x514, BIT(0), (BIT(0) | BIT(1))" and change the macros like:
>
> #define CLK_ON_R(reg) (reg)
> #define CLK_MON_R(reg) (0x680 - 0x500 + (reg))
>
OK will do that.
> > --- /dev/null
> > +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.h
>
> > +#define CLK_ON_R(reg) (0x500 + reg)
> > +#define CLK_MON_R(reg) (0x680 + reg)
> > +#define CLK_RST_R(reg) (0x800 + reg)
> > +#define CLK_MRST_R(reg) (0x980 + reg)
>
> The last three don't seem to be documented?
>
I have asked Chris to send the document across.
Cheers,
Prabhakar