[PATCH v2 09/18] clk: Add PLX Technology OXNAS Standard Clocks

[Neil Armstrong <narmstrong@baylibre.com>]

Add PLX Technology OXNAS SoC Family Standard Clocks support.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/clk/Kconfig     |   6 ++
 drivers/clk/Makefile    |   1 +
 drivers/clk/clk-oxnas.c | 202 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 209 insertions(+)
 create mode 100644 drivers/clk/clk-oxnas.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index eca8e01..16fa822 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -192,6 +192,12 @@ config COMMON_CLK_PXA
 	---help---
 	  Sypport for the Marvell PXA SoC.
 
+config COMMON_CLK_OXNAS
+	bool
+	select MFD_SYSCON
+	---help---
+	  Sypport for the OXNAS SoC Family clocks.
+
 config COMMON_CLK_CDCE706
 	tristate "Clock driver for TI CDCE706 clock synthesizer"
 	depends on I2C
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index bae4be6..a5d45d8 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_ARCH_MB86S7X)		+= clk-mb86s7x.o
 obj-$(CONFIG_ARCH_MOXART)		+= clk-moxart.o
 obj-$(CONFIG_ARCH_NOMADIK)		+= clk-nomadik.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
+obj-$(CONFIG_COMMON_CLK_OXNAS)		+= clk-oxnas.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
 obj-$(CONFIG_CLK_QORIQ)			+= clk-qoriq.o
 obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o
diff --git a/drivers/clk/clk-oxnas.c b/drivers/clk/clk-oxnas.c
new file mode 100644
index 0000000..58b984b
--- /dev/null
+++ b/drivers/clk/clk-oxnas.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 2012 Stephen Warren
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/stringify.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+/* Standard regmap gate clocks */
+struct clk_oxnas {
+	struct clk_hw hw;
+	signed char bit;
+	struct regmap *regmap;
+};
+
+/* Regmap offsets */
+#define CLK_STAT_REGOFFSET	0x24
+#define CLK_SET_REGOFFSET	0x2c
+#define CLK_CLR_REGOFFSET	0x30
+
+static inline struct clk_oxnas *to_clk_oxnas(struct clk_hw *hw)
+{
+	return container_of(hw, struct clk_oxnas, hw);
+}
+
+static int oxnas_clk_is_enabled(struct clk_hw *hw)
+{
+	struct clk_oxnas *std = to_clk_oxnas(hw);
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(std->regmap, CLK_STAT_REGOFFSET, &val);
+	if (ret < 0)
+		return ret;
+
+	return val & BIT(std->bit);
+}
+
+static int oxnas_clk_enable(struct clk_hw *hw)
+{
+	struct clk_oxnas *std = to_clk_oxnas(hw);
+
+	regmap_write(std->regmap, CLK_SET_REGOFFSET, BIT(std->bit));
+
+	return 0;
+}
+
+static void oxnas_clk_disable(struct clk_hw *hw)
+{
+	struct clk_oxnas *std = to_clk_oxnas(hw);
+
+	regmap_write(std->regmap, CLK_CLR_REGOFFSET, BIT(std->bit));
+}
+
+static const struct clk_ops oxnas_clk_ops = {
+	.enable = oxnas_clk_enable,
+	.disable = oxnas_clk_disable,
+	.is_enabled = oxnas_clk_is_enabled,
+};
+
+static const char *const oxnas_clk_parents[] = {
+	"oscillator",
+};
+
+static const char *const eth_parents[] = {
+	"gmacclk",
+};
+
+#define DECLARE_STD_CLKP(__clk, __parent)			\
+static const struct clk_init_data clk_##__clk##_init = {	\
+	.name = __stringify(__clk),				\
+	.ops = &oxnas_clk_ops,					\
+	.parent_names = __parent,				\
+	.num_parents = ARRAY_SIZE(__parent),			\
+}
+
+#define DECLARE_STD_CLK(__clk) DECLARE_STD_CLKP(__clk, oxnas_clk_parents)
+
+/* Clk init data declaration */
+DECLARE_STD_CLK(leon);
+DECLARE_STD_CLK(dma_sgdma);
+DECLARE_STD_CLK(cipher);
+DECLARE_STD_CLK(sata);
+DECLARE_STD_CLK(audio);
+DECLARE_STD_CLK(usbmph);
+DECLARE_STD_CLKP(etha, eth_parents);
+DECLARE_STD_CLK(pciea);
+DECLARE_STD_CLK(nand);
+
+/* Bit - Name association */
+static const struct clk_init_data *clk_oxnas_init[] = {
+	[0] = &clk_leon_init,
+	[1] = &clk_dma_sgdma_init,
+	[2] = &clk_cipher_init,
+	[3] = NULL,		/* Do not touch to DDR clock */
+	[4] = &clk_sata_init,
+	[5] = &clk_audio_init,
+	[6] = &clk_usbmph_init,
+	[7] = &clk_etha_init,
+	[8] = &clk_pciea_init,
+	[9] = &clk_nand_init,
+};
+
+static int oxnas_stdclk_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct regmap *regmap;
+	struct clk_oxnas *clk_oxnas;
+	struct clk_onecell_data *onecell_data;
+	struct clk **clks;
+	unsigned int clks_count = 0;
+	int i;
+
+	clk_oxnas = devm_kzalloc(&pdev->dev,
+				 sizeof(*clk_oxnas)*ARRAY_SIZE(clk_oxnas_init),
+				 GFP_KERNEL);
+	if (!clk_oxnas)
+		return -ENOMEM;
+
+	clks = devm_kzalloc(&pdev->dev,
+			    sizeof(*clks)*ARRAY_SIZE(clk_oxnas_init),
+			    GFP_KERNEL);
+	if (!clks)
+		return -ENOMEM;
+
+	onecell_data = devm_kzalloc(&pdev->dev, sizeof(*onecell_data),
+				     GFP_KERNEL);
+	if (!onecell_data)
+		return -ENOMEM;
+
+	regmap = syscon_node_to_regmap(of_get_parent(np));
+	if (!regmap) {
+		dev_err(&pdev->dev, "failed to have parent regmap\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(clk_oxnas_init); i++) {
+		struct clk_oxnas *_clk;
+
+		if (!clk_oxnas_init[i])
+			continue;
+
+		_clk = &clk_oxnas[i];
+		_clk->bit = i;
+		_clk->hw.init = clk_oxnas_init[i];
+		_clk->regmap = regmap;
+
+		clks[clks_count] = devm_clk_register(&pdev->dev, &_clk->hw);
+		if (WARN_ON(IS_ERR(clks[clks_count])))
+			return PTR_ERR(clks[clks_count]);
+
+		++clks_count;
+	}
+
+	onecell_data->clks = clks;
+	onecell_data->clk_num = clks_count;
+
+	return of_clk_add_provider(np, of_clk_src_onecell_get, onecell_data);
+}
+
+static int oxnas_stdclk_remove(struct platform_device *pdev)
+{
+	of_clk_del_provider(pdev->dev.of_node);
+
+	return 0;
+}
+
+static const struct of_device_id oxnas_stdclk_dt_ids[] = {
+	{ .compatible = "oxsemi,ox810se-stdclk" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, oxnas_stdclk_dt_ids);
+
+static struct platform_driver oxnas_stdclk_driver = {
+	.probe = oxnas_stdclk_probe,
+	.remove = oxnas_stdclk_remove,
+	.driver	= {
+		.name = "oxnas-stdclk",
+		.of_match_table = of_match_ptr(oxnas_stdclk_dt_ids),
+	},
+};
+
+module_platform_driver(oxnas_stdclk_driver);
-- 
1.9.1