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authorAndrew Bresticker <abrestic@chromium.org>2015-02-24 19:56:02 -0800
committerRalf Baechle <ralf@linux-mips.org>2015-03-31 11:58:56 +0200
commit8e4b7721f61e70396ad8ec2d866c91300f2afbd1 (patch)
treeff031cbde67d0d0b8fb1d4d5d168fae82a3c9ba5 /drivers/clk/pistachio
parent1006e3c93161431c81135b8a23fbfa69dcd43ab0 (diff)
CLK: Add basic infrastructure for Pistachio clocks
Add helpers for registering clocks and clock providers on Pistachio. Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Cc: Mike Turquette <mturquette@linaro.org> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: devicetree@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Cc: James Hartley <james.hartley@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Acked-by: Stephen Boyd <sboyd@codeaurora.org> Patchwork: https://patchwork.linux-mips.org/patch/9318/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/clk/pistachio')
-rw-r--r--drivers/clk/pistachio/Makefile1
-rw-r--r--drivers/clk/pistachio/clk.c140
-rw-r--r--drivers/clk/pistachio/clk.h124
3 files changed, 265 insertions, 0 deletions
diff --git a/drivers/clk/pistachio/Makefile b/drivers/clk/pistachio/Makefile
new file mode 100644
index 000000000000..fc216adb744e
--- /dev/null
+++ b/drivers/clk/pistachio/Makefile
@@ -0,0 +1 @@
+obj-y += clk.o
diff --git a/drivers/clk/pistachio/clk.c b/drivers/clk/pistachio/clk.c
new file mode 100644
index 000000000000..85faa83e1bd7
--- /dev/null
+++ b/drivers/clk/pistachio/clk.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include "clk.h"
+
+struct pistachio_clk_provider *
+pistachio_clk_alloc_provider(struct device_node *node, unsigned int num_clks)
+{
+ struct pistachio_clk_provider *p;
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return p;
+
+ p->clk_data.clks = kcalloc(num_clks, sizeof(struct clk *), GFP_KERNEL);
+ if (!p->clk_data.clks)
+ goto free_provider;
+ p->clk_data.clk_num = num_clks;
+ p->node = node;
+ p->base = of_iomap(node, 0);
+ if (!p->base) {
+ pr_err("Failed to map clock provider registers\n");
+ goto free_clks;
+ }
+
+ return p;
+
+free_clks:
+ kfree(p->clk_data.clks);
+free_provider:
+ kfree(p);
+ return NULL;
+}
+
+void pistachio_clk_register_provider(struct pistachio_clk_provider *p)
+{
+ unsigned int i;
+
+ for (i = 0; i < p->clk_data.clk_num; i++) {
+ if (IS_ERR(p->clk_data.clks[i]))
+ pr_warn("Failed to register clock %d: %ld\n", i,
+ PTR_ERR(p->clk_data.clks[i]));
+ }
+
+ of_clk_add_provider(p->node, of_clk_src_onecell_get, &p->clk_data);
+}
+
+void pistachio_clk_register_gate(struct pistachio_clk_provider *p,
+ struct pistachio_gate *gate,
+ unsigned int num)
+{
+ struct clk *clk;
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ clk = clk_register_gate(NULL, gate[i].name, gate[i].parent,
+ CLK_SET_RATE_PARENT,
+ p->base + gate[i].reg, gate[i].shift,
+ 0, NULL);
+ p->clk_data.clks[gate[i].id] = clk;
+ }
+}
+
+void pistachio_clk_register_mux(struct pistachio_clk_provider *p,
+ struct pistachio_mux *mux,
+ unsigned int num)
+{
+ struct clk *clk;
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ clk = clk_register_mux(NULL, mux[i].name, mux[i].parents,
+ mux[i].num_parents,
+ CLK_SET_RATE_NO_REPARENT,
+ p->base + mux[i].reg, mux[i].shift,
+ get_count_order(mux[i].num_parents),
+ 0, NULL);
+ p->clk_data.clks[mux[i].id] = clk;
+ }
+}
+
+void pistachio_clk_register_div(struct pistachio_clk_provider *p,
+ struct pistachio_div *div,
+ unsigned int num)
+{
+ struct clk *clk;
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ clk = clk_register_divider(NULL, div[i].name, div[i].parent,
+ 0, p->base + div[i].reg, 0,
+ div[i].width, div[i].div_flags,
+ NULL);
+ p->clk_data.clks[div[i].id] = clk;
+ }
+}
+
+void pistachio_clk_register_fixed_factor(struct pistachio_clk_provider *p,
+ struct pistachio_fixed_factor *ff,
+ unsigned int num)
+{
+ struct clk *clk;
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ clk = clk_register_fixed_factor(NULL, ff[i].name, ff[i].parent,
+ 0, 1, ff[i].div);
+ p->clk_data.clks[ff[i].id] = clk;
+ }
+}
+
+void pistachio_clk_force_enable(struct pistachio_clk_provider *p,
+ unsigned int *clk_ids, unsigned int num)
+{
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < num; i++) {
+ struct clk *clk = p->clk_data.clks[clk_ids[i]];
+
+ if (IS_ERR(clk))
+ continue;
+
+ err = clk_prepare_enable(clk);
+ if (err)
+ pr_err("Failed to enable clock %s: %d\n",
+ __clk_get_name(clk), err);
+ }
+}
diff --git a/drivers/clk/pistachio/clk.h b/drivers/clk/pistachio/clk.h
new file mode 100644
index 000000000000..e735107ddab0
--- /dev/null
+++ b/drivers/clk/pistachio/clk.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#ifndef __PISTACHIO_CLK_H
+#define __PISTACHIO_CLK_H
+
+#include <linux/clk-provider.h>
+
+struct pistachio_gate {
+ unsigned int id;
+ unsigned long reg;
+ unsigned int shift;
+ const char *name;
+ const char *parent;
+};
+
+#define GATE(_id, _name, _pname, _reg, _shift) \
+ { \
+ .id = _id, \
+ .reg = _reg, \
+ .shift = _shift, \
+ .name = _name, \
+ .parent = _pname, \
+ }
+
+struct pistachio_mux {
+ unsigned int id;
+ unsigned long reg;
+ unsigned int shift;
+ unsigned int num_parents;
+ const char *name;
+ const char **parents;
+};
+
+#define PNAME(x) static const char *x[] __initconst
+
+#define MUX(_id, _name, _pnames, _reg, _shift) \
+ { \
+ .id = _id, \
+ .reg = _reg, \
+ .shift = _shift, \
+ .name = _name, \
+ .parents = _pnames, \
+ .num_parents = ARRAY_SIZE(_pnames) \
+ }
+
+
+struct pistachio_div {
+ unsigned int id;
+ unsigned long reg;
+ unsigned int width;
+ unsigned int div_flags;
+ const char *name;
+ const char *parent;
+};
+
+#define DIV(_id, _name, _pname, _reg, _width) \
+ { \
+ .id = _id, \
+ .reg = _reg, \
+ .width = _width, \
+ .div_flags = 0, \
+ .name = _name, \
+ .parent = _pname, \
+ }
+
+#define DIV_F(_id, _name, _pname, _reg, _width, _div_flags) \
+ { \
+ .id = _id, \
+ .reg = _reg, \
+ .width = _width, \
+ .div_flags = _div_flags, \
+ .name = _name, \
+ .parent = _pname, \
+ }
+
+struct pistachio_fixed_factor {
+ unsigned int id;
+ unsigned int div;
+ const char *name;
+ const char *parent;
+};
+
+#define FIXED_FACTOR(_id, _name, _pname, _div) \
+ { \
+ .id = _id, \
+ .div = _div, \
+ .name = _name, \
+ .parent = _pname, \
+ }
+
+struct pistachio_clk_provider {
+ struct device_node *node;
+ void __iomem *base;
+ struct clk_onecell_data clk_data;
+};
+
+extern struct pistachio_clk_provider *
+pistachio_clk_alloc_provider(struct device_node *node, unsigned int num_clks);
+extern void pistachio_clk_register_provider(struct pistachio_clk_provider *p);
+
+extern void pistachio_clk_register_gate(struct pistachio_clk_provider *p,
+ struct pistachio_gate *gate,
+ unsigned int num);
+extern void pistachio_clk_register_mux(struct pistachio_clk_provider *p,
+ struct pistachio_mux *mux,
+ unsigned int num);
+extern void pistachio_clk_register_div(struct pistachio_clk_provider *p,
+ struct pistachio_div *div,
+ unsigned int num);
+extern void
+pistachio_clk_register_fixed_factor(struct pistachio_clk_provider *p,
+ struct pistachio_fixed_factor *ff,
+ unsigned int num);
+
+extern void pistachio_clk_force_enable(struct pistachio_clk_provider *p,
+ unsigned int *clk_ids, unsigned int num);
+
+#endif