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authorTakashi Yoshii <takasi-y@ops.dti.ne.jp>2013-10-08 14:32:17 +0900
committerSimon Horman <horms+renesas@verge.net.au>2013-12-14 13:17:55 +0900
commit92ca6a8ce97e07206d474da5477d8da4e41bad6c (patch)
treed9bb7916e026c5e53ae5bda3e9113f9364506370 /drivers/clk/shmobile
parentf94859c215b6d977794108a1a9a101239e393c09 (diff)
clk: emev2: Add support for emev2 SMU clocks with DT
Device tree clock binding document for EMMA Mobile EV2 SMU, And Common clock framework based implementation of it. Following nodes are defined to describe clock tree. - renesas,emev2-smu - renesas,emev2-smu-clkdiv - renesas,emev2-smu-gclk These bindings are designed manually based on 19UH0037EJ1000_SMU : System Management Unit User's Manual So far, reparent is not implemented, and is fixed to index #0. Clock tree description is not included, and should be provided by device-tree. Signed-off-by: Takashi Yoshii <takasi-y@ops.dti.ne.jp> Acked-by: Magnus Damm <damm@opensource.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'drivers/clk/shmobile')
-rw-r--r--drivers/clk/shmobile/Makefile2
-rw-r--r--drivers/clk/shmobile/clk-emev2.c104
2 files changed, 105 insertions, 1 deletions
diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
index 706adc6ae70c..9ecef140dba7 100644
--- a/drivers/clk/shmobile/Makefile
+++ b/drivers/clk/shmobile/Makefile
@@ -1,7 +1,7 @@
+obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o
obj-$(CONFIG_ARCH_R8A7790) += clk-rcar-gen2.o
obj-$(CONFIG_ARCH_R8A7791) += clk-rcar-gen2.o
obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-div6.o
obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-mstp.o
-
# for emply built-in.o
obj-n := dummy
diff --git a/drivers/clk/shmobile/clk-emev2.c b/drivers/clk/shmobile/clk-emev2.c
new file mode 100644
index 000000000000..6c7c929c7765
--- /dev/null
+++ b/drivers/clk/shmobile/clk-emev2.c
@@ -0,0 +1,104 @@
+/*
+ * EMMA Mobile EV2 common clock framework support
+ *
+ * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com>
+ * Copyright (C) 2012 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+/* EMEV2 SMU registers */
+#define USIAU0_RSTCTRL 0x094
+#define USIBU1_RSTCTRL 0x0ac
+#define USIBU2_RSTCTRL 0x0b0
+#define USIBU3_RSTCTRL 0x0b4
+#define STI_RSTCTRL 0x124
+#define STI_CLKSEL 0x688
+
+static DEFINE_SPINLOCK(lock);
+
+/* not pretty, but hey */
+void __iomem *smu_base;
+
+static void __init emev2_smu_write(unsigned long value, int offs)
+{
+ BUG_ON(!smu_base || (offs >= PAGE_SIZE));
+ writel_relaxed(value, smu_base + offs);
+}
+
+static const struct of_device_id smu_id[] __initconst = {
+ { .compatible = "renesas,emev2-smu", },
+ {},
+};
+
+static void __init emev2_smu_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_matching_node(NULL, smu_id);
+ BUG_ON(!np);
+ smu_base = of_iomap(np, 0);
+ BUG_ON(!smu_base);
+ of_node_put(np);
+
+ /* setup STI timer to run on 32.768 kHz and deassert reset */
+ emev2_smu_write(0, STI_CLKSEL);
+ emev2_smu_write(1, STI_RSTCTRL);
+
+ /* deassert reset for UART0->UART3 */
+ emev2_smu_write(2, USIAU0_RSTCTRL);
+ emev2_smu_write(2, USIBU1_RSTCTRL);
+ emev2_smu_write(2, USIBU2_RSTCTRL);
+ emev2_smu_write(2, USIBU3_RSTCTRL);
+}
+
+static void __init emev2_smu_clkdiv_init(struct device_node *np)
+{
+ u32 reg[2];
+ struct clk *clk;
+ const char *parent_name = of_clk_get_parent_name(np, 0);
+ if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
+ return;
+ if (!smu_base)
+ emev2_smu_init();
+ clk = clk_register_divider(NULL, np->name, parent_name, 0,
+ smu_base + reg[0], reg[1], 8, 0, &lock);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, np->name, NULL);
+ pr_debug("## %s %s %p\n", __func__, np->name, clk);
+}
+CLK_OF_DECLARE(emev2_smu_clkdiv, "renesas,emev2-smu-clkdiv",
+ emev2_smu_clkdiv_init);
+
+static void __init emev2_smu_gclk_init(struct device_node *np)
+{
+ u32 reg[2];
+ struct clk *clk;
+ const char *parent_name = of_clk_get_parent_name(np, 0);
+ if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
+ return;
+ if (!smu_base)
+ emev2_smu_init();
+ clk = clk_register_gate(NULL, np->name, parent_name, 0,
+ smu_base + reg[0], reg[1], 0, &lock);
+ of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, np->name, NULL);
+ pr_debug("## %s %s %p\n", __func__, np->name, clk);
+}
+CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);