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Message-Id: <1460973696-5977-2-git-send-email-narmstrong@baylibre.com>
Date: Mon, 18 Apr 2016 12:01:35 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-clk@...r.kernel.org, sboyd@...eaurora.org
Cc: Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH v2 1/2] clk: Add Oxford Semiconductor OXNAS Standard Clocks
Add Oxford Semiconductor OXNAS SoC Family Standard Clocks support.
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
drivers/clk/Kconfig | 6 ++
drivers/clk/Makefile | 1 +
drivers/clk/clk-oxnas.c | 198 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 205 insertions(+)
create mode 100644 drivers/clk/clk-oxnas.c
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 16f7d33..f87c027 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -197,6 +197,12 @@ config COMMON_CLK_PXA
---help---
Support for the Marvell PXA SoC.
+config COMMON_CLK_OXNAS
+ bool "Clock driver for the OXNAS SoC Family"
+ select MFD_SYSCON
+ ---help---
+ Support for the OXNAS SoC Family clocks.
+
source "drivers/clk/bcm/Kconfig"
source "drivers/clk/hisilicon/Kconfig"
source "drivers/clk/mvebu/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 46869d6..627da26 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..d57bb48
--- /dev/null
+++ b/drivers/clk/clk-oxnas.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 2012 Stephen Warren
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@...libre.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)
+
+/* Hardware Bit - Clock association */
+struct clk_oxnas_init_data {
+ unsigned long bit;
+ const struct clk_init_data *clk_init;
+};
+
+/* 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);
+
+/* Table index is clock indice */
+static const struct clk_oxnas_init_data clk_oxnas_init[] = {
+ [0] = {0, &clk_leon_init},
+ [1] = {1, &clk_dma_sgdma_init},
+ [2] = {2, &clk_cipher_init},
+ /* Skip & Do not touch to DDR clock */
+ [3] = {4, &clk_sata_init},
+ [4] = {5, &clk_audio_init},
+ [5] = {6, &clk_usbmph_init},
+ [6] = {7, &clk_etha_init},
+ [7] = {8, &clk_pciea_init},
+ [8] = {9, &clk_nand_init},
+};
+
+struct clk_oxnas_data {
+ struct clk_oxnas clk_oxnas[ARRAY_SIZE(clk_oxnas_init)];
+ struct clk_onecell_data onecell_data[ARRAY_SIZE(clk_oxnas_init)];
+ struct clk *clks[ARRAY_SIZE(clk_oxnas_init)];
+};
+
+static int oxnas_stdclk_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct clk_oxnas_data *clk_oxnas;
+ struct regmap *regmap;
+ int i;
+
+ clk_oxnas = devm_kzalloc(&pdev->dev, sizeof(*clk_oxnas), GFP_KERNEL);
+ if (!clk_oxnas)
+ 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].clk_init)
+ continue;
+
+ _clk = &clk_oxnas->clk_oxnas[i];
+ _clk->bit = clk_oxnas_init[i].bit;
+ _clk->hw.init = clk_oxnas_init[i].clk_init;
+ _clk->regmap = regmap;
+
+ clk_oxnas->clks[i] =
+ devm_clk_register(&pdev->dev, &_clk->hw);
+ if (WARN_ON(IS_ERR(clk_oxnas->clks[i])))
+ return PTR_ERR(clk_oxnas->clks[i]);
+ }
+
+ clk_oxnas->onecell_data->clks = clk_oxnas->clks;
+ clk_oxnas->onecell_data->clk_num = ARRAY_SIZE(clk_oxnas_init);
+
+ return of_clk_add_provider(np, of_clk_src_onecell_get,
+ clk_oxnas->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 = oxnas_stdclk_dt_ids,
+ },
+};
+
+module_platform_driver(oxnas_stdclk_driver);
--
1.9.1
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