clk: socfpga: agilex: add clock driver for the Agilex platform
For the most part the Agilex clock structure is very similar to
Stratix10, so we re-use most of the Stratix10 clock driver.
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lkml.kernel.org/r/20200512181647.5071-5-dinguyen@kernel.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c
index 5c3e1ee..4e26895 100644
--- a/drivers/clk/socfpga/clk-pll-s10.c
+++ b/drivers/clk/socfpga/clk-pll-s10.c
@@ -18,8 +18,12 @@
#define SOCFPGA_PLL_RESET_MASK 0x2
#define SOCFPGA_PLL_REFDIV_MASK 0x00003F00
#define SOCFPGA_PLL_REFDIV_SHIFT 8
+#define SOCFPGA_PLL_AREFDIV_MASK 0x00000F00
+#define SOCFPGA_PLL_DREFDIV_MASK 0x00003000
+#define SOCFPGA_PLL_DREFDIV_SHIFT 12
#define SOCFPGA_PLL_MDIV_MASK 0xFF000000
#define SOCFPGA_PLL_MDIV_SHIFT 24
+#define SOCFPGA_AGILEX_PLL_MDIV_MASK 0x000003FF
#define SWCTRLBTCLKSEL_MASK 0x200
#define SWCTRLBTCLKSEL_SHIFT 9
@@ -27,6 +31,27 @@
#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
+static unsigned long agilex_clk_pll_recalc_rate(struct clk_hw *hwclk,
+ unsigned long parent_rate)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+ unsigned long arefdiv, reg, mdiv;
+ unsigned long long vco_freq;
+
+ /* read VCO1 reg for numerator and denominator */
+ reg = readl(socfpgaclk->hw.reg);
+ arefdiv = (reg & SOCFPGA_PLL_AREFDIV_MASK) >> SOCFPGA_PLL_REFDIV_SHIFT;
+
+ vco_freq = (unsigned long long)parent_rate / arefdiv;
+
+ /* Read mdiv and fdiv from the fdbck register */
+ reg = readl(socfpgaclk->hw.reg + 0x24);
+ mdiv = reg & SOCFPGA_AGILEX_PLL_MDIV_MASK;
+
+ vco_freq = (unsigned long long)vco_freq * mdiv;
+ return (unsigned long)vco_freq;
+}
+
static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
unsigned long parent_rate)
{
@@ -98,6 +123,12 @@ static int clk_pll_prepare(struct clk_hw *hwclk)
return 0;
}
+static const struct clk_ops agilex_clk_pll_ops = {
+ .recalc_rate = agilex_clk_pll_recalc_rate,
+ .get_parent = clk_pll_get_parent,
+ .prepare = clk_pll_prepare,
+};
+
static const struct clk_ops clk_pll_ops = {
.recalc_rate = clk_pll_recalc_rate,
.get_parent = clk_pll_get_parent,
@@ -146,3 +177,40 @@ struct clk *s10_register_pll(const struct stratix10_pll_clock *clks,
}
return clk;
}
+
+struct clk *agilex_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 = &agilex_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;
+}
