Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/drivers/clk/renesas/clk-emev2.c b/drivers/clk/renesas/clk-emev2.c
new file mode 100644
index 0000000000..37c6f9be5e
--- /dev/null
+++ b/drivers/clk/renesas/clk-emev2.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * EMMA Mobile EV2 common clock framework support
+ *
+ * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com>
+ * Copyright (C) 2012 Magnus Damm
+ */
+#include <linux/clk-provider.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 IIC0_RSTCTRL 0x0dc
+#define IIC1_RSTCTRL 0x0e0
+#define STI_RSTCTRL 0x124
+#define STI_CLKSEL 0x688
+
+static DEFINE_SPINLOCK(lock);
+
+/* not pretty, but hey */
+static 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);
+
+	/* deassert reset for IIC0->IIC1 */
+	emev2_smu_write(1, IIC0_RSTCTRL);
+	emev2_smu_write(1, IIC1_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);
+	pr_debug("## %s %pOFn %p\n", __func__, np, 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);
+	pr_debug("## %s %pOFn %p\n", __func__, np, clk);
+}
+CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);