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>

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index b24de10039471fc64536441204e2a9ee6fd5b4a4..c383d1259e5c1c89d2a89bea911a62356a8b57fb 100644 (file)
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -8,6 +8,7 @@ Required properties:
 - compatible : shall be one of the following:
        "allwinner,sun4i-osc-clk" - for a gatable oscillator
        "allwinner,sun4i-pll1-clk" - for the main PLL clock
+       "allwinner,sun6i-a31-pll1-clk" - for the main PLL clock on A31
        "allwinner,sun4i-cpu-clk" - for the CPU multiplexer clock
        "allwinner,sun4i-axi-clk" - for the AXI clock
        "allwinner,sun4i-axi-gates-clk" - for the AXI gates
@@ -15,6 +16,8 @@ Required properties:
        "allwinner,sun4i-ahb-gates-clk" - for the AHB gates on A10
        "allwinner,sun5i-a13-ahb-gates-clk" - for the AHB gates on A13
        "allwinner,sun5i-a10s-ahb-gates-clk" - for the AHB gates on A10s
+       "allwinner,sun6i-a31-ahb1-mux-clk" - for the AHB1 multiplexer on A31
+       "allwinner,sun6i-a31-ahb1-gates-clk" - for the AHB1 gates on A31
        "allwinner,sun4i-apb0-clk" - for the APB0 clock
        "allwinner,sun4i-apb0-gates-clk" - for the APB0 gates on A10
        "allwinner,sun5i-a13-apb0-gates-clk" - for the APB0 gates on A13
@@ -24,6 +27,9 @@ Required properties:
        "allwinner,sun4i-apb1-gates-clk" - for the APB1 gates on A10
        "allwinner,sun5i-a13-apb1-gates-clk" - for the APB1 gates on A13
        "allwinner,sun5i-a10s-apb1-gates-clk" - for the APB1 gates on A10s
+       "allwinner,sun6i-a31-apb1-gates-clk" - for the APB1 gates on A31
+       "allwinner,sun6i-a31-apb2-div-clk" - for the APB2 gates on A31
+       "allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
 
 Required properties for all clocks:
 - reg : shall be the control register address for the clock.

diff --git a/Documentation/devicetree/bindings/clock/sunxi/sun6i-a31-gates.txt b/Documentation/devicetree/bindings/clock/sunxi/sun6i-a31-gates.txt
new file mode 100644 (file)
index 0000000..fe44932
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/sunxi/sun6i-a31-gates.txt
@@ -0,0 +1,83 @@
+Gate clock outputs
+------------------
+
+  * AHB1 gates ("allwinner,sun6i-a31-ahb1-gates-clk")
+
+    MIPI DSI                                   1
+
+    SS                                         5
+    DMA                                                6
+
+    MMC0                                       8
+    MMC1                                       9
+    MMC2                                       10
+    MMC3                                       11
+
+    NAND1                                      12
+    NAND0                                      13
+    SDRAM                                      14
+
+    GMAC                                       17
+    TS                                         18
+    HSTIMER                                    19
+    SPI0                                       20
+    SPI1                                       21
+    SPI2                                       22
+    SPI3                                       23
+    USB_OTG                                    24
+
+    EHCI0                                      26
+    EHCI1                                      27
+
+    OHCI0                                      29
+    OHCI1                                      30
+    OHCI2                                      31
+    VE                                         32
+
+    LCD0                                       36
+    LCD1                                       37
+
+    CSI                                                40
+
+    HDMI                                       43
+    DE_BE0                                     44
+    DE_BE1                                     45
+    DE_FE1                                     46
+    DE_FE1                                     47
+
+    MP                                         50
+
+    GPU                                                52
+
+    DEU0                                       55
+    DEU1                                       56
+    DRC0                                       57
+    DRC1                                       58
+
+  * APB1 gates ("allwinner,sun6i-a31-apb1-gates-clk")
+
+    CODEC                                      0
+
+    DIGITAL MIC                                        4
+    PIO                                                5
+
+    DAUDIO0                                    12
+    DAUDIO1                                    13
+
+  * APB2 gates ("allwinner,sun6i-a31-apb2-gates-clk")
+
+    I2C0                                       0
+    I2C1                                       1
+    I2C2                                       2
+    I2C3                                       3
+
+    UART0                                      16
+    UART1                                      17
+    UART2                                      18
+    UART3                                      19
+    UART4                                      20
+    UART5                                      21
+
+Notation:
+ [*]:  The datasheet didn't mention these, but they are present on AW code
+ [**]: The datasheet had this marked as "NC" but they are used on AW code

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 2cafda88b7f66747672b1bddaec279a234460969..6fd02042c13bb9119782ca7a52b886308f548514 100644 (file)
--- 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,},
        {}
 };