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-rw-r--r--drivers/clk/ti/clk.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
new file mode 100644
index 0000000..b1a6f71
--- /dev/null
+++ b/drivers/clk/ti/clk.c
@@ -0,0 +1,167 @@
+/*
+ * TI clock support
+ *
+ * Copyright (C) 2013 Texas Instruments, Inc.
+ *
+ * Tero Kristo <t-kristo@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/clkdev.h>
+#include <linux/clk/ti.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/list.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+static int ti_dt_clk_memmap_index;
+struct ti_clk_ll_ops *ti_clk_ll_ops;
+
+/**
+ * ti_dt_clocks_register - register DT alias clocks during boot
+ * @oclks: list of clocks to register
+ *
+ * Register alias or non-standard DT clock entries during boot. By
+ * default, DT clocks are found based on their node name. If any
+ * additional con-id / dev-id -> clock mapping is required, use this
+ * function to list these.
+ */
+void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
+{
+ struct ti_dt_clk *c;
+ struct device_node *node;
+ struct clk *clk;
+ struct of_phandle_args clkspec;
+
+ for (c = oclks; c->node_name != NULL; c++) {
+ node = of_find_node_by_name(NULL, c->node_name);
+ clkspec.np = node;
+ clk = of_clk_get_from_provider(&clkspec);
+
+ if (!IS_ERR(clk)) {
+ c->lk.clk = clk;
+ clkdev_add(&c->lk);
+ } else {
+ pr_warn("failed to lookup clock node %s\n",
+ c->node_name);
+ }
+ }
+}
+
+struct clk_init_item {
+ struct device_node *node;
+ struct clk_hw *hw;
+ ti_of_clk_init_cb_t func;
+ struct list_head link;
+};
+
+static LIST_HEAD(retry_list);
+
+/**
+ * ti_clk_retry_init - retries a failed clock init at later phase
+ * @node: device not for the clock
+ * @hw: partially initialized clk_hw struct for the clock
+ * @func: init function to be called for the clock
+ *
+ * Adds a failed clock init to the retry list. The retry list is parsed
+ * once all the other clocks have been initialized.
+ */
+int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
+ ti_of_clk_init_cb_t func)
+{
+ struct clk_init_item *retry;
+
+ pr_debug("%s: adding to retry list...\n", node->name);
+ retry = kzalloc(sizeof(*retry), GFP_KERNEL);
+ if (!retry)
+ return -ENOMEM;
+
+ retry->node = node;
+ retry->func = func;
+ retry->hw = hw;
+ list_add(&retry->link, &retry_list);
+
+ return 0;
+}
+
+/**
+ * ti_clk_get_reg_addr - get register address for a clock register
+ * @node: device node for the clock
+ * @index: register index from the clock node
+ *
+ * Builds clock register address from device tree information. This
+ * is a struct of type clk_omap_reg.
+ */
+void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
+{
+ struct clk_omap_reg *reg;
+ u32 val;
+ u32 tmp;
+
+ reg = (struct clk_omap_reg *)&tmp;
+ reg->index = ti_dt_clk_memmap_index;
+
+ if (of_property_read_u32_index(node, "reg", index, &val)) {
+ pr_err("%s must have reg[%d]!\n", node->name, index);
+ return NULL;
+ }
+
+ reg->offset = val;
+
+ return (void __iomem *)tmp;
+}
+
+/**
+ * ti_dt_clk_init_provider - init master clock provider
+ * @parent: master node
+ * @index: internal index for clk_reg_ops
+ *
+ * Initializes a master clock IP block and its child clock nodes.
+ * Regmap is provided for accessing the register space for the
+ * IP block and all the clocks under it.
+ */
+void ti_dt_clk_init_provider(struct device_node *parent, int index)
+{
+ const struct of_device_id *match;
+ struct device_node *np;
+ struct device_node *clocks;
+ of_clk_init_cb_t clk_init_cb;
+ struct clk_init_item *retry;
+ struct clk_init_item *tmp;
+
+ ti_dt_clk_memmap_index = index;
+
+ /* get clocks for this parent */
+ clocks = of_get_child_by_name(parent, "clocks");
+ if (!clocks) {
+ pr_err("%s missing 'clocks' child node.\n", parent->name);
+ return;
+ }
+
+ for_each_child_of_node(clocks, np) {
+ match = of_match_node(&__clk_of_table, np);
+ if (!match)
+ continue;
+ clk_init_cb = (of_clk_init_cb_t)match->data;
+ pr_debug("%s: initializing: %s\n", __func__, np->name);
+ clk_init_cb(np);
+ }
+
+ list_for_each_entry_safe(retry, tmp, &retry_list, link) {
+ pr_debug("retry-init: %s\n", retry->node->name);
+ retry->func(retry->hw, retry->node);
+ list_del(&retry->link);
+ kfree(retry);
+ }
+}
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