[PATCHv2 2/2] clk: socfpga: agilex: add clock driver for eASIC N5X platform
From: Dinh Nguyen
Date: Fri Feb 12 2021 - 09:32:24 EST
Add support for Intel's eASIC N5X platform. The clock manager driver for
the N5X is very similar to the Agilex platform, we can re-use most of
the Agilex clock driver.
This patch makes the necessary changes for the driver to differentiate
between the Agilex and the N5X platforms.
Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
---
v2: use "intel,easic-n5x-clkmgr" binding
correct the pll prepare function
Address Stephen's comments
Add a binding documentation
---
drivers/clk/socfpga/clk-agilex.c | 88 +++++++++++++++++++++++++++-
drivers/clk/socfpga/clk-periph-s10.c | 53 +++++++++++++++++
drivers/clk/socfpga/clk-pll-s10.c | 83 ++++++++++++++++++++++++++
drivers/clk/socfpga/stratix10-clk.h | 17 +++++-
4 files changed, 238 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/socfpga/clk-agilex.c b/drivers/clk/socfpga/clk-agilex.c
index bb3e80928ebe..7689bdd0a914 100644
--- a/drivers/clk/socfpga/clk-agilex.c
+++ b/drivers/clk/socfpga/clk-agilex.c
@@ -196,6 +196,17 @@ static const struct stratix10_pll_clock agilex_pll_clks[] = {
0, 0x9c},
};
+static const struct n5x_perip_c_clock n5x_main_perip_c_clks[] = {
+ { AGILEX_MAIN_PLL_C0_CLK, "main_pll_c0", "main_pll", NULL, 1, 0, 0x54, 0},
+ { AGILEX_MAIN_PLL_C1_CLK, "main_pll_c1", "main_pll", NULL, 1, 0, 0x54, 8},
+ { AGILEX_MAIN_PLL_C2_CLK, "main_pll_c2", "main_pll", NULL, 1, 0, 0x54, 16},
+ { AGILEX_MAIN_PLL_C3_CLK, "main_pll_c3", "main_pll", NULL, 1, 0, 0x54, 24},
+ { AGILEX_PERIPH_PLL_C0_CLK, "peri_pll_c0", "periph_pll", NULL, 1, 0, 0xA8, 0},
+ { AGILEX_PERIPH_PLL_C1_CLK, "peri_pll_c1", "periph_pll", NULL, 1, 0, 0xA8, 8},
+ { AGILEX_PERIPH_PLL_C2_CLK, "peri_pll_c2", "periph_pll", NULL, 1, 0, 0xA8, 16},
+ { AGILEX_PERIPH_PLL_C3_CLK, "peri_pll_c3", "periph_pll", NULL, 1, 0, 0xA8, 24},
+};
+
static const struct stratix10_perip_c_clock agilex_main_perip_c_clks[] = {
{ AGILEX_MAIN_PLL_C0_CLK, "main_pll_c0", "main_pll", NULL, 1, 0, 0x58},
{ AGILEX_MAIN_PLL_C1_CLK, "main_pll_c1", "main_pll", NULL, 1, 0, 0x5C},
@@ -289,6 +300,25 @@ static const struct stratix10_gate_clock agilex_gate_clks[] = {
10, 0, 0, 0, 0, 0, 4},
};
+static int n5x_clk_register_c_perip(const struct n5x_perip_c_clock *clks,
+ int nums, struct stratix10_clock_data *data)
+{
+ struct clk *clk;
+ void __iomem *base = data->base;
+ int i;
+
+ for (i = 0; i < nums; i++) {
+ clk = n5x_register_periph(&clks[i], base);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to register clock %s\n",
+ __func__, clks[i].name);
+ continue;
+ }
+ data->clk_data.clks[clks[i].id] = clk;
+ }
+ return 0;
+}
+
static int agilex_clk_register_c_perip(const struct stratix10_perip_c_clock *clks,
int nums, struct stratix10_clock_data *data)
{
@@ -367,6 +397,26 @@ static int agilex_clk_register_pll(const struct stratix10_pll_clock *clks,
return 0;
}
+static int n5x_clk_register_pll(const struct stratix10_pll_clock *clks,
+ int nums, struct stratix10_clock_data *data)
+{
+ struct clk *clk;
+ void __iomem *base = data->base;
+ int i;
+
+ for (i = 0; i < nums; i++) {
+ clk = n5x_register_pll(&clks[i], base);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to register clock %s\n",
+ __func__, clks[i].name);
+ continue;
+ }
+ data->clk_data.clks[clks[i].id] = clk;
+ }
+
+ return 0;
+}
+
static struct stratix10_clock_data *__socfpga_agilex_clk_init(struct platform_device *pdev,
int nr_clks)
{
@@ -401,7 +451,7 @@ static struct stratix10_clock_data *__socfpga_agilex_clk_init(struct platform_de
return clk_data;
}
-static int agilex_clkmgr_probe(struct platform_device *pdev)
+static int agilex_clkmgr_init(struct platform_device *pdev)
{
struct stratix10_clock_data *clk_data;
@@ -423,9 +473,43 @@ static int agilex_clkmgr_probe(struct platform_device *pdev)
return 0;
}
+static int n5x_clkmgr_init(struct platform_device *pdev)
+{
+ struct stratix10_clock_data *clk_data;
+
+ clk_data = __socfpga_agilex_clk_init(pdev, AGILEX_NUM_CLKS);
+ if (IS_ERR(clk_data))
+ return PTR_ERR(clk_data);
+
+ n5x_clk_register_pll(agilex_pll_clks, ARRAY_SIZE(agilex_pll_clks), clk_data);
+
+ n5x_clk_register_c_perip(n5x_main_perip_c_clks,
+ ARRAY_SIZE(n5x_main_perip_c_clks), clk_data);
+
+ agilex_clk_register_cnt_perip(agilex_main_perip_cnt_clks,
+ ARRAY_SIZE(agilex_main_perip_cnt_clks),
+ clk_data);
+
+ agilex_clk_register_gate(agilex_gate_clks, ARRAY_SIZE(agilex_gate_clks),
+ clk_data);
+ return 0;
+}
+
+static int agilex_clkmgr_probe(struct platform_device *pdev)
+{
+ int (*probe_func)(struct platform_device *init_func);
+
+ probe_func = of_device_get_match_data(&pdev->dev);
+ if (!probe_func)
+ return -ENODEV;
+ return probe_func(pdev);
+}
+
static const struct of_device_id agilex_clkmgr_match_table[] = {
{ .compatible = "intel,agilex-clkmgr",
- .data = agilex_clkmgr_probe },
+ .data = agilex_clkmgr_init },
+ { .compatible = "intel,easic-n5x-clkmgr",
+ .data = n5x_clkmgr_init },
{ }
};
diff --git a/drivers/clk/socfpga/clk-periph-s10.c b/drivers/clk/socfpga/clk-periph-s10.c
index 397b77b89b16..0ff2b9d24035 100644
--- a/drivers/clk/socfpga/clk-periph-s10.c
+++ b/drivers/clk/socfpga/clk-periph-s10.c
@@ -15,6 +15,21 @@
#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)
{
@@ -63,6 +78,11 @@ static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
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,
@@ -107,6 +127,39 @@ struct clk *s10_register_periph(const struct stratix10_perip_c_clock *clks,
return clk;
}
+struct clk *n5x_register_periph(const struct n5x_perip_c_clock *clks,
+ void __iomem *regbase)
+{
+ struct clk *clk;
+ struct socfpga_periph_clk *periph_clk;
+ struct clk_init_data init;
+ const char *name = clks->name;
+ const char *parent_name = clks->parent_name;
+
+ 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;
+
+ clk = clk_register(NULL, &periph_clk->hw.hw);
+ if (WARN_ON(IS_ERR(clk))) {
+ kfree(periph_clk);
+ return NULL;
+ }
+ return clk;
+}
+
struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks,
void __iomem *regbase)
{
diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c
index 4e268953b7da..f6f66e08e1f4 100644
--- a/drivers/clk/socfpga/clk-pll-s10.c
+++ b/drivers/clk/socfpga/clk-pll-s10.c
@@ -27,10 +27,37 @@
#define SWCTRLBTCLKSEL_MASK 0x200
#define SWCTRLBTCLKSEL_SHIFT 9
+#define SOCFPGA_N5X_PLLDIV_FDIV_MASK GENMASK(16, 8)
+#define SOCFPGA_N5X_PLLDIV_FDIV_SHIFT 8
+#define SOCFPGA_N5X_PLLDIV_RDIV_MASK GENMASK(5, 0)
+#define SOCFPGA_N5X_PLLDIV_QDIV_MASK GENMASK(26, 24)
+#define SOCFPGA_N5X_PLLDIV_QDIV_SHIFT 24
+
#define SOCFPGA_BOOT_CLK "boot_clk"
#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
+static unsigned long n5x_clk_pll_recalc_rate(struct clk_hw *hwclk,
+ unsigned long parent_rate)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+ unsigned long fdiv, reg, rdiv, qdiv;
+ u32 power = 1;
+
+ /* read VCO1 reg for numerator and denominator */
+ reg = readl(socfpgaclk->hw.reg + 0x8);
+ fdiv = (reg & SOCFPGA_N5X_PLLDIV_FDIV_MASK) >> SOCFPGA_N5X_PLLDIV_FDIV_SHIFT;
+ rdiv = (reg & SOCFPGA_N5X_PLLDIV_RDIV_MASK);
+ qdiv = (reg & SOCFPGA_N5X_PLLDIV_QDIV_MASK) >> SOCFPGA_N5X_PLLDIV_QDIV_SHIFT;
+
+ while (qdiv) {
+ power *= 2;
+ qdiv--;
+ }
+
+ return ((parent_rate * 2 * (fdiv + 1)) / ((rdiv + 1) * power));
+}
+
static unsigned long agilex_clk_pll_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
@@ -123,6 +150,25 @@ static int clk_pll_prepare(struct clk_hw *hwclk)
return 0;
}
+static int n5x_clk_pll_prepare(struct clk_hw *hwclk)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+ u32 reg;
+
+ /* Bring PLL out of reset */
+ reg = readl(socfpgaclk->hw.reg + 0x4);
+ reg |= SOCFPGA_PLL_RESET_MASK;
+ writel(reg, socfpgaclk->hw.reg + 0x4);
+
+ return 0;
+}
+
+static const struct clk_ops n5x_clk_pll_ops = {
+ .recalc_rate = n5x_clk_pll_recalc_rate,
+ .get_parent = clk_pll_get_parent,
+ .prepare = n5x_clk_pll_prepare,
+};
+
static const struct clk_ops agilex_clk_pll_ops = {
.recalc_rate = agilex_clk_pll_recalc_rate,
.get_parent = clk_pll_get_parent,
@@ -214,3 +260,40 @@ struct clk *agilex_register_pll(const struct stratix10_pll_clock *clks,
}
return clk;
}
+
+struct clk *n5x_register_pll(const struct stratix10_pll_clock *clks,
+ void __iomem *reg)
+{
+ struct clk *clk;
+ struct socfpga_pll *pll_clk;
+ struct clk_init_data init;
+ const char *name = clks->name;
+
+ pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+ if (WARN_ON(!pll_clk))
+ return NULL;
+
+ pll_clk->hw.reg = reg + clks->offset;
+
+ if (streq(name, SOCFPGA_BOOT_CLK))
+ init.ops = &clk_boot_ops;
+ else
+ init.ops = &n5x_clk_pll_ops;
+
+ init.name = name;
+ init.flags = clks->flags;
+
+ init.num_parents = clks->num_parents;
+ init.parent_names = NULL;
+ init.parent_data = clks->parent_data;
+ pll_clk->hw.hw.init = &init;
+
+ pll_clk->hw.bit_idx = SOCFPGA_PLL_POWER;
+
+ clk = clk_register(NULL, &pll_clk->hw.hw);
+ if (WARN_ON(IS_ERR(clk))) {
+ kfree(pll_clk);
+ return NULL;
+ }
+ return clk;
+}
diff --git a/drivers/clk/socfpga/stratix10-clk.h b/drivers/clk/socfpga/stratix10-clk.h
index f9d5d724c694..420deed677ce 100644
--- a/drivers/clk/socfpga/stratix10-clk.h
+++ b/drivers/clk/socfpga/stratix10-clk.h
@@ -30,6 +30,17 @@ struct stratix10_perip_c_clock {
unsigned long offset;
};
+struct n5x_perip_c_clock {
+ unsigned int id;
+ const char *name;
+ const char *parent_name;
+ const char *const *parent_names;
+ u8 num_parents;
+ unsigned long flags;
+ unsigned long offset;
+ unsigned long shift;
+};
+
struct stratix10_perip_cnt_clock {
unsigned int id;
const char *name;
@@ -64,8 +75,12 @@ struct clk *s10_register_pll(const struct stratix10_pll_clock *,
void __iomem *);
struct clk *agilex_register_pll(const struct stratix10_pll_clock *,
void __iomem *);
+struct clk *n5x_register_pll(const struct stratix10_pll_clock *clks,
+ void __iomem *reg);
struct clk *s10_register_periph(const struct stratix10_perip_c_clock *,
- void __iomem *);
+ void __iomem *reg);
+struct clk *n5x_register_periph(const struct n5x_perip_c_clock *clks,
+ void __iomem *reg);
struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *,
void __iomem *);
struct clk *s10_register_gate(const struct stratix10_gate_clock *,
--
2.30.0