Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 452 insertions, 0 deletions

diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mvebu/cp110-system-controller.c
new file mode 100644
index 000000000..0153c76d4
--- /dev/null
+++ b/drivers/clk/mvebu/cp110-system-controller.c
@@ -0,0 +1,452 @@
+/*
+ * Marvell Armada CP110 System Controller
+ *
+ * Copyright (C) 2016 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+/*
+ * CP110 has 6 core clocks:
+ *
+ *  - PLL0		(1 Ghz)
+ *    - PPv2 core	(1/3 PLL0)
+ *    - x2 Core		(1/2 PLL0)
+ *	- Core		(1/2 x2 Core)
+ *    - SDIO		(2/5 PLL0)
+ *
+ *  - NAND clock, which is either:
+ *    - Equal to SDIO clock
+ *    - 2/5 PLL0
+ *
+ * CP110 has 32 gatable clocks, for the various peripherals in the IP.
+ */
+
+#define pr_fmt(fmt) "cp110-system-controller: " fmt
+
+#include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define CP110_PM_CLOCK_GATING_REG	0x220
+#define CP110_NAND_FLASH_CLK_CTRL_REG	0x700
+#define    NF_CLOCK_SEL_400_MASK	BIT(0)
+
+enum {
+	CP110_CLK_TYPE_CORE,
+	CP110_CLK_TYPE_GATABLE,
+};
+
+#define CP110_MAX_CORE_CLOCKS		6
+#define CP110_MAX_GATABLE_CLOCKS	32
+
+#define CP110_CLK_NUM \
+	(CP110_MAX_CORE_CLOCKS + CP110_MAX_GATABLE_CLOCKS)
+
+#define CP110_CORE_PLL0			0
+#define CP110_CORE_PPV2			1
+#define CP110_CORE_X2CORE		2
+#define CP110_CORE_CORE			3
+#define CP110_CORE_NAND			4
+#define CP110_CORE_SDIO			5
+
+/* A number of gatable clocks need special handling */
+#define CP110_GATE_AUDIO		0
+#define CP110_GATE_COMM_UNIT		1
+#define CP110_GATE_NAND			2
+#define CP110_GATE_PPV2			3
+#define CP110_GATE_SDIO			4
+#define CP110_GATE_MG			5
+#define CP110_GATE_MG_CORE		6
+#define CP110_GATE_XOR1			7
+#define CP110_GATE_XOR0			8
+#define CP110_GATE_GOP_DP		9
+#define CP110_GATE_PCIE_X1_0		11
+#define CP110_GATE_PCIE_X1_1		12
+#define CP110_GATE_PCIE_X4		13
+#define CP110_GATE_PCIE_XOR		14
+#define CP110_GATE_SATA			15
+#define CP110_GATE_SATA_USB		16
+#define CP110_GATE_MAIN			17
+#define CP110_GATE_SDMMC_GOP		18
+#define CP110_GATE_SLOW_IO		21
+#define CP110_GATE_USB3H0		22
+#define CP110_GATE_USB3H1		23
+#define CP110_GATE_USB3DEV		24
+#define CP110_GATE_EIP150		25
+#define CP110_GATE_EIP197		26
+
+static const char * const gate_base_names[] = {
+	[CP110_GATE_AUDIO]	= "audio",
+	[CP110_GATE_COMM_UNIT]	= "communit",
+	[CP110_GATE_NAND]	= "nand",
+	[CP110_GATE_PPV2]	= "ppv2",
+	[CP110_GATE_SDIO]	= "sdio",
+	[CP110_GATE_MG]		= "mg-domain",
+	[CP110_GATE_MG_CORE]	= "mg-core",
+	[CP110_GATE_XOR1]	= "xor1",
+	[CP110_GATE_XOR0]	= "xor0",
+	[CP110_GATE_GOP_DP]	= "gop-dp",
+	[CP110_GATE_PCIE_X1_0]	= "pcie_x10",
+	[CP110_GATE_PCIE_X1_1]	= "pcie_x11",
+	[CP110_GATE_PCIE_X4]	= "pcie_x4",
+	[CP110_GATE_PCIE_XOR]	= "pcie-xor",
+	[CP110_GATE_SATA]	= "sata",
+	[CP110_GATE_SATA_USB]	= "sata-usb",
+	[CP110_GATE_MAIN]	= "main",
+	[CP110_GATE_SDMMC_GOP]	= "sd-mmc-gop",
+	[CP110_GATE_SLOW_IO]	= "slow-io",
+	[CP110_GATE_USB3H0]	= "usb3h0",
+	[CP110_GATE_USB3H1]	= "usb3h1",
+	[CP110_GATE_USB3DEV]	= "usb3dev",
+	[CP110_GATE_EIP150]	= "eip150",
+	[CP110_GATE_EIP197]	= "eip197"
+};
+
+struct cp110_gate_clk {
+	struct clk_hw hw;
+	struct regmap *regmap;
+	u8 bit_idx;
+};
+
+#define to_cp110_gate_clk(hw) container_of(hw, struct cp110_gate_clk, hw)
+
+static int cp110_gate_enable(struct clk_hw *hw)
+{
+	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);
+
+	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
+			   BIT(gate->bit_idx), BIT(gate->bit_idx));
+
+	return 0;
+}
+
+static void cp110_gate_disable(struct clk_hw *hw)
+{
+	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);
+
+	regmap_update_bits(gate->regmap, CP110_PM_CLOCK_GATING_REG,
+			   BIT(gate->bit_idx), 0);
+}
+
+static int cp110_gate_is_enabled(struct clk_hw *hw)
+{
+	struct cp110_gate_clk *gate = to_cp110_gate_clk(hw);
+	u32 val;
+
+	regmap_read(gate->regmap, CP110_PM_CLOCK_GATING_REG, &val);
+
+	return val & BIT(gate->bit_idx);
+}
+
+static const struct clk_ops cp110_gate_ops = {
+	.enable = cp110_gate_enable,
+	.disable = cp110_gate_disable,
+	.is_enabled = cp110_gate_is_enabled,
+};
+
+static struct clk_hw *cp110_register_gate(const char *name,
+					  const char *parent_name,
+					  struct regmap *regmap, u8 bit_idx)
+{
+	struct cp110_gate_clk *gate;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	memset(&init, 0, sizeof(init));
+
+	init.name = name;
+	init.ops = &cp110_gate_ops;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	gate->regmap = regmap;
+	gate->bit_idx = bit_idx;
+	gate->hw.init = &init;
+
+	hw = &gate->hw;
+	ret = clk_hw_register(NULL, hw);
+	if (ret) {
+		kfree(gate);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void cp110_unregister_gate(struct clk_hw *hw)
+{
+	clk_hw_unregister(hw);
+	kfree(to_cp110_gate_clk(hw));
+}
+
+static struct clk_hw *cp110_of_clk_get(struct of_phandle_args *clkspec,
+				       void *data)
+{
+	struct clk_hw_onecell_data *clk_data = data;
+	unsigned int type = clkspec->args[0];
+	unsigned int idx = clkspec->args[1];
+
+	if (type == CP110_CLK_TYPE_CORE) {
+		if (idx >= CP110_MAX_CORE_CLOCKS)
+			return ERR_PTR(-EINVAL);
+		return clk_data->hws[idx];
+	} else if (type == CP110_CLK_TYPE_GATABLE) {
+		if (idx >= CP110_MAX_GATABLE_CLOCKS)
+			return ERR_PTR(-EINVAL);
+		return clk_data->hws[CP110_MAX_CORE_CLOCKS + idx];
+	}
+
+	return ERR_PTR(-EINVAL);
+}
+
+static char *cp110_unique_name(struct device *dev, struct device_node *np,
+			       const char *name)
+{
+	const __be32 *reg;
+	u64 addr;
+
+	/* Do not create a name if there is no clock */
+	if (!name)
+		return NULL;
+
+	reg = of_get_property(np, "reg", NULL);
+	addr = of_translate_address(np, reg);
+	return devm_kasprintf(dev, GFP_KERNEL, "%llx-%s",
+			      (unsigned long long)addr, name);
+}
+
+static int cp110_syscon_common_probe(struct platform_device *pdev,
+				     struct device_node *syscon_node)
+{
+	struct regmap *regmap;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	const char *ppv2_name, *pll0_name, *core_name, *x2core_name, *nand_name,
+		*sdio_name;
+	struct clk_hw_onecell_data *cp110_clk_data;
+	struct clk_hw *hw, **cp110_clks;
+	u32 nand_clk_ctrl;
+	int i, ret;
+	char *gate_name[ARRAY_SIZE(gate_base_names)];
+
+	regmap = syscon_node_to_regmap(syscon_node);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	ret = regmap_read(regmap, CP110_NAND_FLASH_CLK_CTRL_REG,
+			  &nand_clk_ctrl);
+	if (ret)
+		return ret;
+
+	cp110_clk_data = devm_kzalloc(dev, sizeof(*cp110_clk_data) +
+				      sizeof(struct clk_hw *) * CP110_CLK_NUM,
+				      GFP_KERNEL);
+	if (!cp110_clk_data)
+		return -ENOMEM;
+
+	cp110_clks = cp110_clk_data->hws;
+	cp110_clk_data->num = CP110_CLK_NUM;
+
+	/* Register the PLL0 which is the root of the hw tree */
+	pll0_name = cp110_unique_name(dev, syscon_node, "pll0");
+	hw = clk_hw_register_fixed_rate(NULL, pll0_name, NULL, 0,
+					1000 * 1000 * 1000);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_pll0;
+	}
+
+	cp110_clks[CP110_CORE_PLL0] = hw;
+
+	/* PPv2 is PLL0/3 */
+	ppv2_name = cp110_unique_name(dev, syscon_node, "ppv2-core");
+	hw = clk_hw_register_fixed_factor(NULL, ppv2_name, pll0_name, 0, 1, 3);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_ppv2;
+	}
+
+	cp110_clks[CP110_CORE_PPV2] = hw;
+
+	/* X2CORE clock is PLL0/2 */
+	x2core_name = cp110_unique_name(dev, syscon_node, "x2core");
+	hw = clk_hw_register_fixed_factor(NULL, x2core_name, pll0_name,
+					  0, 1, 2);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_eip;
+	}
+
+	cp110_clks[CP110_CORE_X2CORE] = hw;
+
+	/* Core clock is X2CORE/2 */
+	core_name = cp110_unique_name(dev, syscon_node, "core");
+	hw = clk_hw_register_fixed_factor(NULL, core_name, x2core_name,
+					  0, 1, 2);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_core;
+	}
+
+	cp110_clks[CP110_CORE_CORE] = hw;
+	/* NAND can be either PLL0/2.5 or core clock */
+	nand_name = cp110_unique_name(dev, syscon_node, "nand-core");
+	if (nand_clk_ctrl & NF_CLOCK_SEL_400_MASK)
+		hw = clk_hw_register_fixed_factor(NULL, nand_name,
+						   pll0_name, 0, 2, 5);
+	else
+		hw = clk_hw_register_fixed_factor(NULL, nand_name,
+						   core_name, 0, 1, 1);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_nand;
+	}
+
+	cp110_clks[CP110_CORE_NAND] = hw;
+
+	/* SDIO clock is PLL0/2.5 */
+	sdio_name = cp110_unique_name(dev, syscon_node, "sdio-core");
+	hw = clk_hw_register_fixed_factor(NULL, sdio_name,
+					  pll0_name, 0, 2, 5);
+	if (IS_ERR(hw)) {
+		ret = PTR_ERR(hw);
+		goto fail_sdio;
+	}
+
+	cp110_clks[CP110_CORE_SDIO] = hw;
+
+	/* create the unique name for all the gate clocks */
+	for (i = 0; i < ARRAY_SIZE(gate_base_names); i++)
+		gate_name[i] =	cp110_unique_name(dev, syscon_node,
+						  gate_base_names[i]);
+
+	for (i = 0; i < ARRAY_SIZE(gate_base_names); i++) {
+		const char *parent;
+
+		if (gate_name[i] == NULL)
+			continue;
+
+		switch (i) {
+		case CP110_GATE_NAND:
+			parent = nand_name;
+			break;
+		case CP110_GATE_MG:
+		case CP110_GATE_GOP_DP:
+		case CP110_GATE_PPV2:
+			parent = ppv2_name;
+			break;
+		case CP110_GATE_SDIO:
+			parent = sdio_name;
+			break;
+		case CP110_GATE_MAIN:
+		case CP110_GATE_PCIE_XOR:
+		case CP110_GATE_PCIE_X4:
+		case CP110_GATE_EIP150:
+		case CP110_GATE_EIP197:
+			parent = x2core_name;
+			break;
+		default:
+			parent = core_name;
+			break;
+		}
+		hw = cp110_register_gate(gate_name[i], parent, regmap, i);
+
+		if (IS_ERR(hw)) {
+			ret = PTR_ERR(hw);
+			goto fail_gate;
+		}
+
+		cp110_clks[CP110_MAX_CORE_CLOCKS + i] = hw;
+	}
+
+	ret = of_clk_add_hw_provider(np, cp110_of_clk_get, cp110_clk_data);
+	if (ret)
+		goto fail_clk_add;
+
+	platform_set_drvdata(pdev, cp110_clks);
+
+	return 0;
+
+fail_clk_add:
+fail_gate:
+	for (i = 0; i < CP110_MAX_GATABLE_CLOCKS; i++) {
+		hw = cp110_clks[CP110_MAX_CORE_CLOCKS + i];
+
+		if (hw)
+			cp110_unregister_gate(hw);
+	}
+
+	clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_SDIO]);
+fail_sdio:
+	clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]);
+fail_nand:
+	clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
+fail_core:
+	clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_X2CORE]);
+fail_eip:
+	clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_PPV2]);
+fail_ppv2:
+	clk_hw_unregister_fixed_rate(cp110_clks[CP110_CORE_PLL0]);
+fail_pll0:
+	return ret;
+}
+
+static int cp110_syscon_legacy_clk_probe(struct platform_device *pdev)
+{
+	dev_warn(&pdev->dev, FW_WARN "Using legacy device tree binding\n");
+	dev_warn(&pdev->dev, FW_WARN "Update your device tree:\n");
+	dev_warn(&pdev->dev, FW_WARN
+		 "This binding won't be supported in future kernels\n");
+
+	return cp110_syscon_common_probe(pdev, pdev->dev.of_node);
+}
+
+static int cp110_clk_probe(struct platform_device *pdev)
+{
+	return cp110_syscon_common_probe(pdev, pdev->dev.of_node->parent);
+}
+
+static const struct of_device_id cp110_syscon_legacy_of_match[] = {
+	{ .compatible = "marvell,cp110-system-controller0", },
+	{ }
+};
+
+static struct platform_driver cp110_syscon_legacy_driver = {
+	.probe = cp110_syscon_legacy_clk_probe,
+	.driver		= {
+		.name	= "marvell-cp110-system-controller0",
+		.of_match_table = cp110_syscon_legacy_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver(cp110_syscon_legacy_driver);
+
+static const struct of_device_id cp110_clock_of_match[] = {
+	{ .compatible = "marvell,cp110-clock", },
+	{ }
+};
+
+static struct platform_driver cp110_clock_driver = {
+	.probe = cp110_clk_probe,
+	.driver		= {
+		.name	= "marvell-cp110-clock",
+		.of_match_table = cp110_clock_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+builtin_platform_driver(cp110_clock_driver);