1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-smd.c b/drivers/clk/at91/clk-smd.c
new file mode 100644
index 000000000..160378438
--- /dev/null
+++ b/drivers/clk/at91/clk-smd.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/of.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include "pmc.h"
+
+#define SMD_DIV_SHIFT		8
+#define SMD_MAX_DIV		0xf
+
+struct at91sam9x5_clk_smd {
+	struct clk_hw hw;
+	struct regmap *regmap;
+};
+
+#define to_at91sam9x5_clk_smd(hw) \
+	container_of(hw, struct at91sam9x5_clk_smd, hw)
+
+static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw,
+						    unsigned long parent_rate)
+{
+	struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
+	unsigned int smdr;
+	u8 smddiv;
+
+	regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
+	smddiv = (smdr & AT91_PMC_SMD_DIV) >> SMD_DIV_SHIFT;
+
+	return parent_rate / (smddiv + 1);
+}
+
+static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate,
+					  unsigned long *parent_rate)
+{
+	unsigned long div;
+	unsigned long bestrate;
+	unsigned long tmp;
+
+	if (rate >= *parent_rate)
+		return *parent_rate;
+
+	div = *parent_rate / rate;
+	if (div > SMD_MAX_DIV)
+		return *parent_rate / (SMD_MAX_DIV + 1);
+
+	bestrate = *parent_rate / div;
+	tmp = *parent_rate / (div + 1);
+	if (bestrate - rate > rate - tmp)
+		bestrate = tmp;
+
+	return bestrate;
+}
+
+static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
+
+	if (index > 1)
+		return -EINVAL;
+
+	regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMDS,
+			   index ? AT91_PMC_SMDS : 0);
+
+	return 0;
+}
+
+static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw)
+{
+	struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
+	unsigned int smdr;
+
+	regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
+
+	return smdr & AT91_PMC_SMDS;
+}
+
+static int at91sam9x5_clk_smd_set_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long parent_rate)
+{
+	struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
+	unsigned long div = parent_rate / rate;
+
+	if (parent_rate % rate || div < 1 || div > (SMD_MAX_DIV + 1))
+		return -EINVAL;
+
+	regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMD_DIV,
+			   (div - 1) << SMD_DIV_SHIFT);
+
+	return 0;
+}
+
+static const struct clk_ops at91sam9x5_smd_ops = {
+	.recalc_rate = at91sam9x5_clk_smd_recalc_rate,
+	.round_rate = at91sam9x5_clk_smd_round_rate,
+	.get_parent = at91sam9x5_clk_smd_get_parent,
+	.set_parent = at91sam9x5_clk_smd_set_parent,
+	.set_rate = at91sam9x5_clk_smd_set_rate,
+};
+
+struct clk_hw * __init
+at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name,
+			    const char **parent_names, u8 num_parents)
+{
+	struct at91sam9x5_clk_smd *smd;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	smd = kzalloc(sizeof(*smd), GFP_KERNEL);
+	if (!smd)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &at91sam9x5_smd_ops;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
+
+	smd->hw.init = &init;
+	smd->regmap = regmap;
+
+	hw = &smd->hw;
+	ret = clk_hw_register(NULL, &smd->hw);
+	if (ret) {
+		kfree(smd);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}