Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC driver updates from Arnd Bergmann:
 "The most noteworthy SoC driver changes this time include:

   - The TEE subsystem gains an in-kernel interface to access the TEE
     from device drivers.

   - The reset controller subsystem gains a driver for the Qualcomm
     Snapdragon 845 Power Domain Controller.

   - The Xilinx Zynq platform now has a firmware interface for its
     platform management unit. This contains a firmware "ioctl"
     interface that was a little controversial at first, but the version
     we merged solved that by not exposing arbitrary firmware calls to
     user space.

   - The Amlogic Meson platform gains a "canvas" driver that is used for
     video processing and shared between different high-level drivers.

  The rest is more of the usual, mostly related to SoC specific power
  management support and core drivers in drivers/soc:

   - Several Renesas SoCs (RZ/G1N, RZ/G2M, R-Car V3M, RZ/A2M) gain new
     features related to power and reset control.

   - The Mediatek mt8183 and mt6765 SoC platforms gain support for their
     respective power management chips.

   - A new driver for NXP i.MX8, which need a firmware interface for
     power management.

   - The SCPI firmware interface now contains support estimating power
     usage of performance states

   - The NVIDIA Tegra "pmc" driver gains a few new features, in
     particular a pinctrl interface for configuring the pads.

   - Lots of small changes for Qualcomm, in particular the "smem" device
     driver.

   - Some cleanups for the TI OMAP series related to their sysc
     controller.

  Additional cleanups and bugfixes in SoC specific drivers include the
  Meson, Keystone, NXP, AT91, Sunxi, Actions, and Tegra platforms"

* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (129 commits)
  firmware: tegra: bpmp: Implement suspend/resume support
  drivers: clk: Add ZynqMP clock driver
  dt-bindings: clock: Add bindings for ZynqMP clock driver
  firmware: xilinx: Add zynqmp IOCTL API for device control
  Documentation: xilinx: Add documentation for eemi APIs
  MAINTAINERS: imx: include drivers/firmware/imx path
  firmware: imx: add misc svc support
  firmware: imx: add SCU firmware driver support
  reset: Fix potential use-after-free in __of_reset_control_get()
  dt-bindings: arm: fsl: add scu binding doc
  soc: fsl: qbman: add interrupt coalesce changing APIs
  soc: fsl: bman_portals: defer probe after bman's probe
  soc: fsl: qbman: Use last response to determine valid bit
  soc: fsl: qbman: Add 64 bit DMA addressing requirement to QBMan
  soc: fsl: qbman: replace CPU 0 with any online CPU in hotplug handlers
  soc: fsl: qbman: Check if CPU is offline when initializing portals
  reset: qcom: PDC Global (Power Domain Controller) reset controller
  dt-bindings: reset: Add PDC Global binding for SDM845 SoCs
  reset: Grammar s/more then once/more than once/
  bus: ti-sysc: Just use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS
  ...

1 files changed, 217 insertions, 0 deletions

diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c
new file mode 100644
index 000000000000..a371c66e72ef
--- /dev/null
+++ b/drivers/clk/zynqmp/divider.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC Divider support
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ *
+ * Adjustable divider clock implementation
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/*
+ * DOC: basic adjustable divider clock that cannot gate
+ *
+ * Traits of this clock:
+ * prepare - clk_prepare only ensures that parents are prepared
+ * enable - clk_enable only ensures that parents are enabled
+ * rate - rate is adjustable.  clk->rate = ceiling(parent->rate / divisor)
+ * parent - fixed parent.  No clk_set_parent support
+ */
+
+#define to_zynqmp_clk_divider(_hw)		\
+	container_of(_hw, struct zynqmp_clk_divider, hw)
+
+#define CLK_FRAC	BIT(13) /* has a fractional parent */
+
+/**
+ * struct zynqmp_clk_divider - adjustable divider clock
+ * @hw:		handle between common and hardware-specific interfaces
+ * @flags:	Hardware specific flags
+ * @clk_id:	Id of clock
+ * @div_type:	divisor type (TYPE_DIV1 or TYPE_DIV2)
+ */
+struct zynqmp_clk_divider {
+	struct clk_hw hw;
+	u8 flags;
+	u32 clk_id;
+	u32 div_type;
+};
+
+static inline int zynqmp_divider_get_val(unsigned long parent_rate,
+					 unsigned long rate)
+{
+	return DIV_ROUND_CLOSEST(parent_rate, rate);
+}
+
+/**
+ * zynqmp_clk_divider_recalc_rate() - Recalc rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @parent_rate:	rate of parent clock
+ *
+ * Return: 0 on success else error+reason
+ */
+static unsigned long zynqmp_clk_divider_recalc_rate(struct clk_hw *hw,
+						    unsigned long parent_rate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 div, value;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_getdivider(clk_id, &div);
+
+	if (ret)
+		pr_warn_once("%s() get divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	if (div_type == TYPE_DIV1)
+		value = div & 0xFFFF;
+	else
+		value = div >> 16;
+
+	return DIV_ROUND_UP_ULL(parent_rate, value);
+}
+
+/**
+ * zynqmp_clk_divider_round_rate() - Round rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @rate:		rate of clock to be set
+ * @prate:		rate of parent clock
+ *
+ * Return: 0 on success else error+reason
+ */
+static long zynqmp_clk_divider_round_rate(struct clk_hw *hw,
+					  unsigned long rate,
+					  unsigned long *prate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 bestdiv;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	/* if read only, just return current value */
+	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
+		ret = eemi_ops->clock_getdivider(clk_id, &bestdiv);
+
+		if (ret)
+			pr_warn_once("%s() get divider failed for %s, ret = %d\n",
+				     __func__, clk_name, ret);
+		if (div_type == TYPE_DIV1)
+			bestdiv = bestdiv & 0xFFFF;
+		else
+			bestdiv  = bestdiv >> 16;
+
+		return DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
+	}
+
+	bestdiv = zynqmp_divider_get_val(*prate, rate);
+
+	if ((clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) &&
+	    (divider->flags & CLK_FRAC))
+		bestdiv = rate % *prate ? 1 : bestdiv;
+	*prate = rate * bestdiv;
+
+	return rate;
+}
+
+/**
+ * zynqmp_clk_divider_set_rate() - Set rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @rate:		rate of clock to be set
+ * @parent_rate:	rate of parent clock
+ *
+ * Return: 0 on success else error+reason
+ */
+static int zynqmp_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long parent_rate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 value, div;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	value = zynqmp_divider_get_val(parent_rate, rate);
+	if (div_type == TYPE_DIV1) {
+		div = value & 0xFFFF;
+		div |= 0xffff << 16;
+	} else {
+		div = 0xffff;
+		div |= value << 16;
+	}
+
+	ret = eemi_ops->clock_setdivider(clk_id, div);
+
+	if (ret)
+		pr_warn_once("%s() set divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_clk_divider_ops = {
+	.recalc_rate = zynqmp_clk_divider_recalc_rate,
+	.round_rate = zynqmp_clk_divider_round_rate,
+	.set_rate = zynqmp_clk_divider_set_rate,
+};
+
+/**
+ * zynqmp_clk_register_divider() - Register a divider clock
+ * @name:		Name of this clock
+ * @clk_id:		Id of clock
+ * @parents:		Name of this clock's parents
+ * @num_parents:	Number of parents
+ * @nodes:		Clock topology node
+ *
+ * Return: clock hardware to registered clock divider
+ */
+struct clk_hw *zynqmp_clk_register_divider(const char *name,
+					   u32 clk_id,
+					   const char * const *parents,
+					   u8 num_parents,
+					   const struct clock_topology *nodes)
+{
+	struct zynqmp_clk_divider *div;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	/* allocate the divider */
+	div = kzalloc(sizeof(*div), GFP_KERNEL);
+	if (!div)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &zynqmp_clk_divider_ops;
+	init.flags = nodes->flag;
+	init.parent_names = parents;
+	init.num_parents = 1;
+
+	/* struct clk_divider assignments */
+	div->flags = nodes->type_flag;
+	div->hw.init = &init;
+	div->clk_id = clk_id;
+	div->div_type = nodes->type;
+
+	hw = &div->hw;
+	ret = clk_hw_register(NULL, hw);
+	if (ret) {
+		kfree(div);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+EXPORT_SYMBOL_GPL(zynqmp_clk_register_divider);