Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / clk / shmobile / clk-emev2.c

diff --git a/kernel/drivers/clk/shmobile/clk-emev2.c b/kernel/drivers/clk/shmobile/clk-emev2.c
new file mode 100644 (file)
index 0000000..6c7c929
--- /dev/null
+++ b/kernel/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);