clk: sunxi: Add A31 clocks support

The A31 has a mostly different clock set compared to the other older
SoCs currently supported in the Allwinner clock driver.

Add support for the basic useful clocks. The other ones will come in
eventually.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Emilio López <emilio@elopez.com.ar>

1 files changed, 124 insertions, 0 deletions

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 2cafda88b7f6..6fd02042c13b 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -125,7 +125,89 @@ static void sun4i_get_pll1_factors(u32 *freq, u32 parent_rate,
         *n = div / 4;
 }
 
+/**
+ * sun6i_a31_get_pll1_factors() - calculates n, k and m factors for PLL1
+ * PLL1 rate is calculated as follows
+ * rate = parent_rate * (n + 1) * (k + 1) / (m + 1);
+ * parent_rate should always be 24MHz
+ */
+static void sun6i_a31_get_pll1_factors(u32 *freq, u32 parent_rate,
+                                       u8 *n, u8 *k, u8 *m, u8 *p)
+{
+        /*
+         * We can operate only on MHz, this will make our life easier
+         * later.
+         */
+        u32 freq_mhz = *freq / 1000000;
+        u32 parent_freq_mhz = parent_rate / 1000000;
+
+        /*
+         * Round down the frequency to the closest multiple of either
+         * 6 or 16
+         */
+        u32 round_freq_6 = round_down(freq_mhz, 6);
+        u32 round_freq_16 = round_down(freq_mhz, 16);
+
+        if (round_freq_6 > round_freq_16)
+                freq_mhz = round_freq_6;
+        else
+                freq_mhz = round_freq_16;
 
+        *freq = freq_mhz * 1000000;
+
+        /*
+         * If the factors pointer are null, we were just called to
+         * round down the frequency.
+         * Exit.
+         */
+        if (n == NULL)
+                return;
+
+        /* If the frequency is a multiple of 32 MHz, k is always 3 */
+        if (!(freq_mhz % 32))
+                *k = 3;
+        /* If the frequency is a multiple of 9 MHz, k is always 2 */
+        else if (!(freq_mhz % 9))
+                *k = 2;
+        /* If the frequency is a multiple of 8 MHz, k is always 1 */
+        else if (!(freq_mhz % 8))
+                *k = 1;
+        /* Otherwise, we don't use the k factor */
+        else
+                *k = 0;
+
+        /*
+         * If the frequency is a multiple of 2 but not a multiple of
+         * 3, m is 3. This is the first time we use 6 here, yet we
+         * will use it on several other places.
+         * We use this number because it's the lowest frequency we can
+         * generate (with n = 0, k = 0, m = 3), so every other frequency
+         * somehow relates to this frequency.
+         */
+        if ((freq_mhz % 6) == 2 || (freq_mhz % 6) == 4)
+                *m = 2;
+        /*
+         * If the frequency is a multiple of 6MHz, but the factor is
+         * odd, m will be 3
+         */
+        else if ((freq_mhz / 6) & 1)
+                *m = 3;
+        /* Otherwise, we end up with m = 1 */
+        else
+                *m = 1;
+
+        /* Calculate n thanks to the above factors we already got */
+        *n = freq_mhz * (*m + 1) / ((*k + 1) * parent_freq_mhz) - 1;
+
+        /*
+         * If n end up being outbound, and that we can still decrease
+         * m, do it.
+         */
+        if ((*n + 1) > 31 && (*m + 1) > 1) {
+                *n = (*n + 1) / 2 - 1;
+                *m = (*m + 1) / 2 - 1;
+        }
+}
 
 /**
  * sun4i_get_apb1_factors() - calculates m, p factors for APB1
@@ -190,6 +272,15 @@ static struct clk_factors_config sun4i_pll1_config = {
         .pwidth = 2,
 };
 
+static struct clk_factors_config sun6i_a31_pll1_config = {
+        .nshift = 8,
+        .nwidth = 5,
+        .kshift = 4,
+        .kwidth = 2,
+        .mshift = 0,
+        .mwidth = 2,
+};
+
 static struct clk_factors_config sun4i_apb1_config = {
         .mshift = 0,
         .mwidth = 5,
@@ -202,6 +293,11 @@ static const __initconst struct factors_data sun4i_pll1_data = {
         .getter = sun4i_get_pll1_factors,
 };
 
+static const __initconst struct factors_data sun6i_a31_pll1_data = {
+        .table = &sun6i_a31_pll1_config,
+        .getter = sun6i_a31_get_pll1_factors,
+};
+
 static const __initconst struct factors_data sun4i_apb1_data = {
         .table = &sun4i_apb1_config,
         .getter = sun4i_get_apb1_factors,
@@ -244,6 +340,10 @@ static const __initconst struct mux_data sun4i_cpu_mux_data = {
         .shift = 16,
 };
 
+static const __initconst struct mux_data sun6i_a31_ahb1_mux_data = {
+        .shift = 12,
+};
+
 static const __initconst struct mux_data sun4i_apb1_mux_data = {
         .shift = 24,
 };
@@ -303,6 +403,12 @@ static const __initconst struct div_data sun4i_apb0_data = {
         .width  = 2,
 };
 
+static const __initconst struct div_data sun6i_a31_apb2_div_data = {
+        .shift  = 0,
+        .pow    = 0,
+        .width  = 4,
+};
+
 static void __init sunxi_divider_clk_setup(struct device_node *node,
                                            struct div_data *data)
 {
@@ -353,6 +459,10 @@ static const __initconst struct gates_data sun5i_a13_ahb_gates_data = {
         .mask = {0x107067e7, 0x185111},
 };
 
+static const __initconst struct gates_data sun6i_a31_ahb1_gates_data = {
+        .mask = {0xEDFE7F62, 0x794F931},
+};
+
 static const __initconst struct gates_data sun4i_apb0_gates_data = {
         .mask = {0x4EF},
 };
@@ -377,6 +487,14 @@ static const __initconst struct gates_data sun5i_a13_apb1_gates_data = {
         .mask = {0xa0007},
 };
 
+static const __initconst struct gates_data sun6i_a31_apb1_gates_data = {
+        .mask = {0x3031},
+};
+
+static const __initconst struct gates_data sun6i_a31_apb2_gates_data = {
+        .mask = {0x3F000F},
+};
+
 static void __init sunxi_gates_clk_setup(struct device_node *node,
                                          struct gates_data *data)
 {
@@ -429,6 +547,7 @@ static void __init sunxi_gates_clk_setup(struct device_node *node,
 /* Matches for factors clocks */
 static const __initconst struct of_device_id clk_factors_match[] = {
         {.compatible = "allwinner,sun4i-pll1-clk", .data = &sun4i_pll1_data,},
+        {.compatible = "allwinner,sun6i-a31-pll1-clk", .data = &sun6i_a31_pll1_data,},
         {.compatible = "allwinner,sun4i-apb1-clk", .data = &sun4i_apb1_data,},
         {}
 };
@@ -438,6 +557,7 @@ static const __initconst struct of_device_id clk_div_match[] = {
         {.compatible = "allwinner,sun4i-axi-clk", .data = &sun4i_axi_data,},
         {.compatible = "allwinner,sun4i-ahb-clk", .data = &sun4i_ahb_data,},
         {.compatible = "allwinner,sun4i-apb0-clk", .data = &sun4i_apb0_data,},
+        {.compatible = "allwinner,sun6i-a31-apb2-div-clk", .data = &sun6i_a31_apb2_div_data,},
         {}
 };
 
@@ -445,6 +565,7 @@ static const __initconst struct of_device_id clk_div_match[] = {
 static const __initconst struct of_device_id clk_mux_match[] = {
         {.compatible = "allwinner,sun4i-cpu-clk", .data = &sun4i_cpu_mux_data,},
         {.compatible = "allwinner,sun4i-apb1-mux-clk", .data = &sun4i_apb1_mux_data,},
+        {.compatible = "allwinner,sun6i-a31-ahb1-mux-clk", .data = &sun6i_a31_ahb1_mux_data,},
         {}
 };
 
@@ -454,12 +575,15 @@ static const __initconst struct of_device_id clk_gates_match[] = {
         {.compatible = "allwinner,sun4i-ahb-gates-clk", .data = &sun4i_ahb_gates_data,},
         {.compatible = "allwinner,sun5i-a10s-ahb-gates-clk", .data = &sun5i_a10s_ahb_gates_data,},
         {.compatible = "allwinner,sun5i-a13-ahb-gates-clk", .data = &sun5i_a13_ahb_gates_data,},
+        {.compatible = "allwinner,sun6i-a31-ahb1-gates-clk", .data = &sun6i_a31_ahb1_gates_data,},
         {.compatible = "allwinner,sun4i-apb0-gates-clk", .data = &sun4i_apb0_gates_data,},
         {.compatible = "allwinner,sun5i-a10s-apb0-gates-clk", .data = &sun5i_a10s_apb0_gates_data,},
         {.compatible = "allwinner,sun5i-a13-apb0-gates-clk", .data = &sun5i_a13_apb0_gates_data,},
         {.compatible = "allwinner,sun4i-apb1-gates-clk", .data = &sun4i_apb1_gates_data,},
         {.compatible = "allwinner,sun5i-a10s-apb1-gates-clk", .data = &sun5i_a10s_apb1_gates_data,},
         {.compatible = "allwinner,sun5i-a13-apb1-gates-clk", .data = &sun5i_a13_apb1_gates_data,},
+        {.compatible = "allwinner,sun6i-a31-apb1-gates-clk", .data = &sun6i_a31_apb1_gates_data,},
+        {.compatible = "allwinner,sun6i-a31-apb2-gates-clk", .data = &sun6i_a31_apb2_gates_data,},
         {}
 };