[PATCHv13 14/40] CLK: TI: DRA7: Add APLL support
Tero Kristo
t-kristo at ti.com
Thu Jan 9 09:00:25 EST 2014
From: J Keerthy <j-keerthy at ti.com>
The patch adds support for DRA7 PCIe APLL. The APLL
sources the optional functional clocks for PCIe module.
APLL stands for Analog PLL. This is different when comapred
with DPLL meaning Digital PLL, the phase detection is done
using an analog circuit.
Signed-off-by: J Keerthy <j-keerthy at ti.com>
Signed-off-by: Tero Kristo <t-kristo at ti.com>
---
.../devicetree/bindings/clock/ti/apll.txt | 31 +++
drivers/clk/ti/Makefile | 2 +-
drivers/clk/ti/apll.c | 223 ++++++++++++++++++++
3 files changed, 255 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/clock/ti/apll.txt
create mode 100644 drivers/clk/ti/apll.c
diff --git a/Documentation/devicetree/bindings/clock/ti/apll.txt b/Documentation/devicetree/bindings/clock/ti/apll.txt
new file mode 100644
index 0000000..7faf5a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ti/apll.txt
@@ -0,0 +1,31 @@
+Binding for Texas Instruments APLL clock.
+
+Binding status: Unstable - ABI compatibility may be broken in the future
+
+This binding uses the common clock binding[1]. It assumes a
+register-mapped APLL with usually two selectable input clocks
+(reference clock and bypass clock), with analog phase locked
+loop logic for multiplying the input clock to a desired output
+clock. This clock also typically supports different operation
+modes (locked, low power stop etc.) APLL mostly behaves like
+a subtype of a DPLL [2], although a simplified one at that.
+
+[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
+[2] Documentation/devicetree/bindings/clock/ti/dpll.txt
+
+Required properties:
+- compatible : shall be "ti,dra7-apll-clock"
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : link phandles of parent clocks (clk-ref and clk-bypass)
+- reg : address and length of the register set for controlling the APLL.
+ It contains the information of registers in the following order:
+ "control" - contains the control register base address
+ "idlest" - contains the idlest register base address
+
+Examples:
+ apll_pcie_ck: apll_pcie_ck at 4a008200 {
+ #clock-cells = <0>;
+ clocks = <&apll_pcie_in_clk_mux>, <&dpll_pcie_ref_ck>;
+ reg = <0x4a00821c 0x4>, <0x4a008220 0x4>;
+ compatible = "ti,dra7-apll-clock";
+ };
diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
index 935e5d2..3d71e1e 100644
--- a/drivers/clk/ti/Makefile
+++ b/drivers/clk/ti/Makefile
@@ -1,7 +1,7 @@
ifneq ($(CONFIG_OF),)
obj-y += clk.o dpll.o autoidle.o divider.o \
fixed-factor.o gate.o clockdomain.o \
- composite.o mux.o
+ composite.o mux.o apll.o
obj-$(CONFIG_ARCH_OMAP4) += clk-44xx.o
obj-$(CONFIG_SOC_OMAP5) += clk-54xx.o
endif
diff --git a/drivers/clk/ti/apll.c b/drivers/clk/ti/apll.c
new file mode 100644
index 0000000..b986f61
--- /dev/null
+++ b/drivers/clk/ti/apll.c
@@ -0,0 +1,223 @@
+/*
+ * OMAP APLL clock support
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * J Keerthy <j-keerthy at ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/log2.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk/ti.h>
+#include <linux/delay.h>
+
+#define APLL_FORCE_LOCK 0x1
+#define APLL_AUTO_IDLE 0x2
+#define MAX_APLL_WAIT_TRIES 1000000
+
+#undef pr_fmt
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+static int dra7_apll_enable(struct clk_hw *hw)
+{
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+ int r = 0, i = 0;
+ struct dpll_data *ad;
+ const char *clk_name;
+ u8 state = 1;
+ u32 v;
+
+ ad = clk->dpll_data;
+ if (!ad)
+ return -EINVAL;
+
+ clk_name = __clk_get_name(clk->hw.clk);
+
+ state <<= __ffs(ad->idlest_mask);
+
+ /* Check is already locked */
+ v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
+
+ if ((v & ad->idlest_mask) == state)
+ return r;
+
+ v = ti_clk_ll_ops->clk_readl(ad->control_reg);
+ v &= ~ad->enable_mask;
+ v |= APLL_FORCE_LOCK << __ffs(ad->enable_mask);
+ ti_clk_ll_ops->clk_writel(v, ad->control_reg);
+
+ state <<= __ffs(ad->idlest_mask);
+
+ while (1) {
+ v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
+ if ((v & ad->idlest_mask) == state)
+ break;
+ if (i > MAX_APLL_WAIT_TRIES)
+ break;
+ i++;
+ udelay(1);
+ }
+
+ if (i == MAX_APLL_WAIT_TRIES) {
+ pr_warn("clock: %s failed transition to '%s'\n",
+ clk_name, (state) ? "locked" : "bypassed");
+ } else {
+ pr_debug("clock: %s transition to '%s' in %d loops\n",
+ clk_name, (state) ? "locked" : "bypassed", i);
+
+ r = 0;
+ }
+
+ return r;
+}
+
+static void dra7_apll_disable(struct clk_hw *hw)
+{
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+ struct dpll_data *ad;
+ u8 state = 1;
+ u32 v;
+
+ ad = clk->dpll_data;
+
+ state <<= __ffs(ad->idlest_mask);
+
+ v = ti_clk_ll_ops->clk_readl(ad->control_reg);
+ v &= ~ad->enable_mask;
+ v |= APLL_AUTO_IDLE << __ffs(ad->enable_mask);
+ ti_clk_ll_ops->clk_writel(v, ad->control_reg);
+}
+
+static int dra7_apll_is_enabled(struct clk_hw *hw)
+{
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+ struct dpll_data *ad;
+ u32 v;
+
+ ad = clk->dpll_data;
+
+ v = ti_clk_ll_ops->clk_readl(ad->control_reg);
+ v &= ad->enable_mask;
+
+ v >>= __ffs(ad->enable_mask);
+
+ return v == APLL_AUTO_IDLE ? 0 : 1;
+}
+
+static u8 dra7_init_apll_parent(struct clk_hw *hw)
+{
+ return 0;
+}
+
+static const struct clk_ops apll_ck_ops = {
+ .enable = &dra7_apll_enable,
+ .disable = &dra7_apll_disable,
+ .is_enabled = &dra7_apll_is_enabled,
+ .get_parent = &dra7_init_apll_parent,
+};
+
+static void __init omap_clk_register_apll(struct clk_hw *hw,
+ struct device_node *node)
+{
+ struct clk_hw_omap *clk_hw = to_clk_hw_omap(hw);
+ struct dpll_data *ad = clk_hw->dpll_data;
+ struct clk *clk;
+
+ ad->clk_ref = of_clk_get(node, 0);
+ ad->clk_bypass = of_clk_get(node, 1);
+
+ if (IS_ERR(ad->clk_ref) || IS_ERR(ad->clk_bypass)) {
+ pr_debug("clk-ref or clk-bypass for %s not ready, retry\n",
+ node->name);
+ if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
+ return;
+
+ goto cleanup;
+ }
+
+ clk = clk_register(NULL, &clk_hw->hw);
+ if (!IS_ERR(clk)) {
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ kfree(clk_hw->hw.init->parent_names);
+ kfree(clk_hw->hw.init);
+ return;
+ }
+
+cleanup:
+ kfree(clk_hw->dpll_data);
+ kfree(clk_hw->hw.init->parent_names);
+ kfree(clk_hw->hw.init);
+ kfree(clk_hw);
+}
+
+static void __init of_dra7_apll_setup(struct device_node *node)
+{
+ struct dpll_data *ad = NULL;
+ struct clk_hw_omap *clk_hw = NULL;
+ struct clk_init_data *init = NULL;
+ const char **parent_names = NULL;
+ int i;
+
+ ad = kzalloc(sizeof(*ad), GFP_KERNEL);
+ clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
+ init = kzalloc(sizeof(*init), GFP_KERNEL);
+ if (!ad || !clk_hw || !init)
+ goto cleanup;
+
+ clk_hw->dpll_data = ad;
+ clk_hw->hw.init = init;
+ clk_hw->flags = MEMMAP_ADDRESSING;
+
+ init->name = node->name;
+ init->ops = &apll_ck_ops;
+
+ init->num_parents = of_clk_get_parent_count(node);
+ if (init->num_parents < 1) {
+ pr_err("dra7 apll %s must have parent(s)\n", node->name);
+ goto cleanup;
+ }
+
+ parent_names = kzalloc(sizeof(char *) * init->num_parents, GFP_KERNEL);
+ if (!parent_names)
+ goto cleanup;
+
+ for (i = 0; i < init->num_parents; i++)
+ parent_names[i] = of_clk_get_parent_name(node, i);
+
+ init->parent_names = parent_names;
+
+ ad->control_reg = ti_clk_get_reg_addr(node, 0);
+ ad->idlest_reg = ti_clk_get_reg_addr(node, 1);
+
+ if (!ad->control_reg || !ad->idlest_reg)
+ goto cleanup;
+
+ ad->idlest_mask = 0x1;
+ ad->enable_mask = 0x3;
+
+ omap_clk_register_apll(&clk_hw->hw, node);
+ return;
+
+cleanup:
+ kfree(parent_names);
+ kfree(ad);
+ kfree(clk_hw);
+ kfree(init);
+}
+CLK_OF_DECLARE(dra7_apll_clock, "ti,dra7-apll-clock", of_dra7_apll_setup);
--
1.7.9.5
More information about the linux-arm-kernel
mailing list