new file mode 100644
@@ -0,0 +1,76 @@
+* Gated Clock bindings for Marvell Orion SoCs
+
+Marvell Dove and Kirkwood allow some peripheral clocks to be gated to save
+some power. The clock consumer should specify the desired clock by having
+the clock ID in its "clocks" phandle cell. The clock ID is directly mapped to
+the corresponding clock gating control bit in HW to ease manual clock lookup
+in datasheet.
+
+The following is a list of provided IDs for Dove:
+ID Clock Peripheral
+-----------------------------------
+0 usb0 USB Host 0
+1 usb1 USB Host 1
+2 ge Gigabit Ethernet
+3 sata SATA Host
+4 pex0 PCIe Cntrl 0
+5 pex1 PCIe Cntrl 1
+8 sdio0 SDHCI Host 0
+9 sdio1 SDHCI Host 1
+10 nand NAND Cntrl
+11 camera Camera Cntrl
+12 i2s0 I2S Cntrl 0
+13 i2s1 I2S Cntrl 1
+15 crypto CESA engine
+21 ac97 AC97 Cntrl
+22 pdma Peripheral DMA
+23 xor0 XOR DMA 0
+24 xor1 XOR DMA 1
+30 gephy Gigabit Ethernel PHY
+Note: gephy(30) is implemented as a parent clock of ge(2)
+
+The following is a list of provided IDs for Kirkwood:
+ID Clock Peripheral
+-----------------------------------
+0 ge0 Gigabit Ethernet 0
+2 pex0 PCIe Cntrl 0
+3 usb0 USB Host 0
+4 sdio SDIO Cntrl
+5 tsu Transp. Stream Unit
+6 dunit SDRAM Cntrl
+7 runit Runit
+8 xor0 XOR DMA 0
+9 audio I2S Cntrl 0
+14 sata0 SATA Host 0
+15 sata1 SATA Host 1
+16 xor1 XOR DMA 1
+17 crypto CESA engine
+18 pex1 PCIe Cntrl 1
+19 ge1 Gigabit Ethernet 0
+20 tdm Time Division Mplx
+
+Required properties:
+- compatible : shall be one of the following:
+ "marvell,dove-clock-gating" - for Dove SoC clock gating
+ "marvell,kirkwood-clock-gating" - for Kirkwood SoC clock gating
+- reg : shall be the register address of the Clock Gating Control register
+- #clock-cells : from common clock binding; shall be set to 1
+
+Optional properties:
+- clocks : default parent clock phandle (e.g. tclk)
+
+Example:
+
+clk_gate: clock-gating-control@d0038 {
+ compatible = "marvell,dove-clock-gating";
+ reg = <0xd0038 0x4>;
+ /* default parent clock is tclk */
+ clocks = <&core_clk 0>;
+ #clock-cells = <1>;
+};
+
+sdio0: sdio@92000 {
+ compatible = "marvell,dove-sdhci";
+ /* get clk gate bit 8 (sdio0) */
+ clocks = <&clk_gate 8>;
+};
@@ -4,3 +4,5 @@ config MVEBU_CLK_CORE
config MVEBU_CLK_CPU
bool
+config MVEBU_CLK_GATING
+ bool
@@ -1,2 +1,3 @@
obj-$(CONFIG_MVEBU_CLK_CORE) += clk.o clk-core.o
obj-$(CONFIG_MVEBU_CLK_CPU) += clk-cpu.o
+obj-$(CONFIG_MVEBU_CLK_GATING) += clk-gating-ctrl.o
new file mode 100644
@@ -0,0 +1,177 @@
+/*
+ * Marvell MVEBU clock gating control.
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/mvebu.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+struct mvebu_gating_ctrl {
+ spinlock_t lock;
+ struct clk **gates;
+ int num_gates;
+};
+
+struct mvebu_soc_descr {
+ const char *name;
+ const char *parent;
+ int bit_idx;
+};
+
+#define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
+
+static struct clk __init *mvebu_clk_gating_get_src(
+ struct of_phandle_args *clkspec, void *data)
+{
+ struct mvebu_gating_ctrl *ctrl = (struct mvebu_gating_ctrl *)data;
+ int n;
+
+ if (clkspec->args_count < 1)
+ return ERR_PTR(-EINVAL);
+
+ for (n = 0; n < ctrl->num_gates; n++) {
+ struct clk_gate *gate =
+ to_clk_gate(__clk_get_hw(ctrl->gates[n]));
+ if (clkspec->args[0] == gate->bit_idx)
+ return ctrl->gates[n];
+ }
+ return ERR_PTR(-ENODEV);
+}
+
+static void __init mvebu_clk_gating_setup(
+ struct device_node *np, const struct mvebu_soc_descr *descr)
+{
+ struct mvebu_gating_ctrl *ctrl;
+ struct clk *clk;
+ void __iomem *base;
+ const char *default_parent = NULL;
+ int n;
+
+ base = of_iomap(np, 0);
+
+ clk = of_clk_get(np, 0);
+ if (!IS_ERR(clk)) {
+ default_parent = __clk_get_name(clk);
+ clk_put(clk);
+ }
+
+ ctrl = kzalloc(sizeof(struct mvebu_gating_ctrl), GFP_KERNEL);
+ if (WARN_ON(!ctrl))
+ return;
+
+ spin_lock_init(&ctrl->lock);
+
+ /*
+ * Count, allocate, and register clock gates
+ */
+ for (n = 0; descr[n].name;)
+ n++;
+
+ ctrl->num_gates = n;
+ ctrl->gates = kzalloc(ctrl->num_gates * sizeof(struct clk *),
+ GFP_KERNEL);
+ if (WARN_ON(!ctrl->gates)) {
+ kfree(ctrl);
+ return;
+ }
+
+ for (n = 0; n < ctrl->num_gates; n++) {
+ const char *parent =
+ (descr[n].parent) ? descr[n].parent : default_parent;
+ ctrl->gates[n] = clk_register_gate(NULL, descr[n].name, parent,
+ 0, base, descr[n].bit_idx, 0, &ctrl->lock);
+ WARN_ON(IS_ERR(ctrl->gates[n]));
+ }
+ of_clk_add_provider(np, mvebu_clk_gating_get_src, ctrl);
+}
+
+/*
+ * SoC specific clock gating control
+ */
+
+#ifdef CONFIG_ARCH_DOVE
+static const struct mvebu_soc_descr __initconst dove_gating_descr[] = {
+ { "usb0", NULL, 0 },
+ { "usb1", NULL, 1 },
+ { "ge", "gephy", 2 },
+ { "sata", NULL, 3 },
+ { "pex0", NULL, 4 },
+ { "pex1", NULL, 5 },
+ { "sdio0", NULL, 8 },
+ { "sdio1", NULL, 9 },
+ { "nand", NULL, 10 },
+ { "camera", NULL, 11 },
+ { "i2s0", NULL, 12 },
+ { "i2s1", NULL, 13 },
+ { "crypto", NULL, 15 },
+ { "ac97", NULL, 21 },
+ { "pdma", NULL, 22 },
+ { "xor0", NULL, 23 },
+ { "xor1", NULL, 24 },
+ { "gephy", NULL, 30 },
+ { }
+};
+#endif
+
+#ifdef CONFIG_ARCH_KIRKWOOD
+static const struct mvebu_soc_descr __initconst kirkwood_gating_descr[] = {
+ { "ge0", NULL, 0 },
+ { "pex0", NULL, 2 },
+ { "usb0", NULL, 3 },
+ { "sdio", NULL, 4 },
+ { "tsu", NULL, 5 },
+ { "runit", NULL, 7 },
+ { "xor0", NULL, 8 },
+ { "audio", NULL, 9 },
+ { "sata0", NULL, 14 },
+ { "sata1", NULL, 15 },
+ { "xor1", NULL, 16 },
+ { "crypto", NULL, 17 },
+ { "pex1", NULL, 18 },
+ { "ge1", NULL, 19 },
+ { "tdm", NULL, 20 },
+ { }
+};
+#endif
+
+static const __initdata struct of_device_id clk_gating_match[] = {
+#ifdef CONFIG_ARCH_DOVE
+ {
+ .compatible = "marvell,dove-clock-gating",
+ .data = dove_gating_descr,
+ },
+#endif
+
+#ifdef CONFIG_ARCH_KIRKWOOD
+ {
+ .compatible = "marvell,kirkwood-clock-gating",
+ .data = kirkwood_gating_descr,
+ },
+#endif
+
+ { }
+};
+
+void __init mvebu_clk_gating_init(void)
+{
+ struct device_node *np;
+
+ for_each_matching_node(np, clk_gating_match) {
+ const struct of_device_id *match =
+ of_match_node(clk_gating_match, np);
+ mvebu_clk_gating_setup(np,
+ (const struct mvebu_soc_descr *)match->data);
+ }
+}
@@ -18,5 +18,6 @@
#define __CLK_MVEBU_H_
void __init mvebu_clocks_init(void);
+void mvebu_clk_gating_init(void);
#endif