clk: mvebu: Add clk support for the orion5x SoC mv88f5181

Referring to the u-boot sources for the Netgear WNR854T, add support
for the mv88f5181.

[gregory.clement@free-electrons.com: fix commit title]
Signed-off-by: Jamie Lentin <jm@lentin.co.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

2 files changed, 71 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt b/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
index 670c2af3e931..eb985a633d59 100644
--- a/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
+++ b/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
@@ -52,6 +52,7 @@ Required properties:
         "marvell,dove-core-clock" - for Dove SoC core clocks
         "marvell,kirkwood-core-clock" - for Kirkwood SoC (except mv88f6180)
         "marvell,mv88f6180-core-clock" - for Kirkwood MV88f6180 SoC
+        "marvell,mv88f5181-core-clock" - for Orion MV88F5181 SoC
         "marvell,mv88f5182-core-clock" - for Orion MV88F5182 SoC
         "marvell,mv88f5281-core-clock" - for Orion MV88F5281 SoC
         "marvell,mv88f6183-core-clock" - for Orion MV88F6183 SoC
diff --git a/drivers/clk/mvebu/orion.c b/drivers/clk/mvebu/orion.c
index fd129566c1ce..a6e5bee23385 100644
--- a/drivers/clk/mvebu/orion.c
+++ b/drivers/clk/mvebu/orion.c
@@ -21,6 +21,76 @@ static const struct coreclk_ratio orion_coreclk_ratios[] __initconst = {
 };
 
 /*
+ * Orion 5181
+ */
+
+#define SAR_MV88F5181_TCLK_FREQ      8
+#define SAR_MV88F5181_TCLK_FREQ_MASK 0x3
+
+static u32 __init mv88f5181_get_tclk_freq(void __iomem *sar)
+{
+        u32 opt = (readl(sar) >> SAR_MV88F5181_TCLK_FREQ) &
+                SAR_MV88F5181_TCLK_FREQ_MASK;
+        if (opt == 0)
+                return 133333333;
+        else if (opt == 1)
+                return 150000000;
+        else if (opt == 2)
+                return 166666667;
+        else
+                return 0;
+}
+
+#define SAR_MV88F5181_CPU_FREQ       4
+#define SAR_MV88F5181_CPU_FREQ_MASK  0xf
+
+static u32 __init mv88f5181_get_cpu_freq(void __iomem *sar)
+{
+        u32 opt = (readl(sar) >> SAR_MV88F5181_CPU_FREQ) &
+                SAR_MV88F5181_CPU_FREQ_MASK;
+        if (opt == 0)
+                return 333333333;
+        else if (opt == 1 || opt == 2)
+                return 400000000;
+        else if (opt == 3)
+                return 500000000;
+        else
+                return 0;
+}
+
+static void __init mv88f5181_get_clk_ratio(void __iomem *sar, int id,
+                                           int *mult, int *div)
+{
+        u32 opt = (readl(sar) >> SAR_MV88F5181_CPU_FREQ) &
+                SAR_MV88F5181_CPU_FREQ_MASK;
+        if (opt == 0 || opt == 1) {
+                *mult = 1;
+                *div  = 2;
+        } else if (opt == 2 || opt == 3) {
+                *mult = 1;
+                *div  = 3;
+        } else {
+                *mult = 0;
+                *div  = 1;
+        }
+}
+
+static const struct coreclk_soc_desc mv88f5181_coreclks = {
+        .get_tclk_freq = mv88f5181_get_tclk_freq,
+        .get_cpu_freq = mv88f5181_get_cpu_freq,
+        .get_clk_ratio = mv88f5181_get_clk_ratio,
+        .ratios = orion_coreclk_ratios,
+        .num_ratios = ARRAY_SIZE(orion_coreclk_ratios),
+};
+
+static void __init mv88f5181_clk_init(struct device_node *np)
+{
+        return mvebu_coreclk_setup(np, &mv88f5181_coreclks);
+}
+
+CLK_OF_DECLARE(mv88f5181_clk, "marvell,mv88f5181-core-clock", mv88f5181_clk_init);
+
+/*
  * Orion 5182
  */