From: <dinguyen@opensource.altera.com>
To: <sboyd@codeaurora.org>, <mturquette@linaro.org>
CC: <dinh.linux@gmail.com>, <robh+dt@kernel.org>,
        <ijc+devicetree@hellion.org.uk>, <galak@codeaurora.org>,
        <mark.rutland@arm.com>, <pawel.moll@arm.com>,
        <linux-arm-kernel@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        Dinh Nguyen <dinguyen@opensource.altera.com>
Subject: [PATCHv2 2/4] clk: socfpga: add a clock driver for the Arria 10 platform
Date: Tue, 28 Apr 2015 10:10:14 -0500
Message-ID: <1430233816-32635-3-git-send-email-dinguyen@opensource.altera.com>
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From: Dinh Nguyen <dinguyen@opensource.altera.com>

The clocks on the Arria 10 platform is a bit different than the Cyclone/Arria 5
platform that it should just have it's own driver.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
---
 drivers/clk/socfpga/Makefile         |   1 +
 drivers/clk/socfpga/clk-gate-a10.c   | 187 +++++++++++++++++++++++++++++++++++
 drivers/clk/socfpga/clk-periph-a10.c | 131 ++++++++++++++++++++++++
 drivers/clk/socfpga/clk-pll-a10.c    | 132 +++++++++++++++++++++++++
 drivers/clk/socfpga/clk.c            |   7 +-
 drivers/clk/socfpga/clk.h            |   4 +
 6 files changed, 461 insertions(+), 1 deletion(-)
 create mode 100644 drivers/clk/socfpga/clk-gate-a10.c
 create mode 100644 drivers/clk/socfpga/clk-periph-a10.c
 create mode 100644 drivers/clk/socfpga/clk-pll-a10.c

diff --git a/drivers/clk/socfpga/Makefile b/drivers/clk/socfpga/Makefile
index 7e2d15a..d8bb239 100644
--- a/drivers/clk/socfpga/Makefile
+++ b/drivers/clk/socfpga/Makefile
@@ -2,3 +2,4 @@ obj-y += clk.o
 obj-y += clk-gate.o
 obj-y += clk-pll.o
 obj-y += clk-periph.o
+obj-y += clk-pll-a10.o clk-periph-a10.o clk-gate-a10.o
diff --git a/drivers/clk/socfpga/clk-gate-a10.c b/drivers/clk/socfpga/clk-gate-a10.c
new file mode 100644
index 0000000..7329657
--- /dev/null
+++ b/drivers/clk/socfpga/clk-gate-a10.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2015 Altera Corporation. All rights reserved
+ *
+ * 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.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#include "clk.h"
+
+#define streq(a, b) (strcmp((a), (b)) == 0)
+
+#define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)
+
+/* SDMMC Group for System Manager defines */
+#define SYSMGR_SDMMCGRP_CTRL_OFFSET	0x28
+
+static unsigned long socfpga_gate_clk_recalc_rate(struct clk_hw *hwclk,
+	unsigned long parent_rate)
+{
+	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
+	u32 div = 1, val;
+
+	if (socfpgaclk->fixed_div)
+		div = socfpgaclk->fixed_div;
+	else if (socfpgaclk->div_reg) {
+		val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
+		val &= div_mask(socfpgaclk->width);
+			div = (1 << val);
+	}
+
+	return parent_rate / div;
+}
+
+static int socfpga_clk_prepare(struct clk_hw *hwclk)
+{
+	struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
+	struct regmap *sys_mgr_base_addr;
+	int i;
+	u32 hs_timing;
+	u32 clk_phase[2];
+
+	if (socfpgaclk->clk_phase[0] || socfpgaclk->clk_phase[1]) {
+		sys_mgr_base_addr = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
+		if (IS_ERR(sys_mgr_base_addr)) {
+			pr_err("%s: failed to find altr,sys-mgr regmap!\n", __func__);
+			return -EINVAL;
+		}
+
+		for (i = 0; i < 2; i++) {
+			switch (socfpgaclk->clk_phase[i]) {
+			case 0:
+				clk_phase[i] = 0;
+				break;
+			case 45:
+				clk_phase[i] = 1;
+				break;
+			case 90:
+				clk_phase[i] = 2;
+				break;
+			case 135:
+				clk_phase[i] = 3;
+				break;
+			case 180:
+				clk_phase[i] = 4;
+				break;
+			case 225:
+				clk_phase[i] = 5;
+				break;
+			case 270:
+				clk_phase[i] = 6;
+				break;
+			case 315:
+				clk_phase[i] = 7;
+				break;
+			default:
+				clk_phase[i] = 0;
+				break;
+			}
+		}
+
+		hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1]);
+		regmap_write(sys_mgr_base_addr, SYSMGR_SDMMCGRP_CTRL_OFFSET,
+			     hs_timing);
+	}
+	return 0;
+}
+
+static struct clk_ops gateclk_ops = {
+	.prepare = socfpga_clk_prepare,
+	.recalc_rate = socfpga_gate_clk_recalc_rate,
+};
+
+static void __init __socfpga_gate_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 clk_gate[2];
+	u32 div_reg[3];
+	u32 clk_phase[2];
+	u32 fixed_div;
+	struct clk *clk;
+	struct socfpga_gate_clk *socfpga_clk;
+	const char *clk_name = node->name;
+	const char *parent_name[SOCFPGA_MAX_PARENTS];
+	struct clk_init_data init;
+	int rc;
+	int i = 0;
+
+	socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
+	if (WARN_ON(!socfpga_clk))
+		return;
+
+	rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
+	if (rc)
+		clk_gate[0] = 0;
+
+	if (clk_gate[0]) {
+		socfpga_clk->hw.reg = clk_mgr_a10_base_addr + clk_gate[0];
+		socfpga_clk->hw.bit_idx = clk_gate[1];
+
+		gateclk_ops.enable = clk_gate_ops.enable;
+		gateclk_ops.disable = clk_gate_ops.disable;
+	}
+
+	rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
+	if (rc)
+		socfpga_clk->fixed_div = 0;
+	else
+		socfpga_clk->fixed_div = fixed_div;
+
+	rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
+	if (!rc) {
+		socfpga_clk->div_reg = clk_mgr_a10_base_addr + div_reg[0];
+		socfpga_clk->shift = div_reg[1];
+		socfpga_clk->width = div_reg[2];
+	} else {
+		socfpga_clk->div_reg = 0;
+	}
+
+	rc = of_property_read_u32_array(node, "clk-phase", clk_phase, 2);
+	if (!rc) {
+		socfpga_clk->clk_phase[0] = clk_phase[0];
+		socfpga_clk->clk_phase[1] = clk_phase[1];
+	}
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = ops;
+	init.flags = 0;
+	while (i < SOCFPGA_MAX_PARENTS && (parent_name[i] =
+			of_clk_get_parent_name(node, i)) != NULL)
+		i++;
+
+	init.parent_names = parent_name;
+	init.num_parents = i;
+	socfpga_clk->hw.hw.init = &init;
+
+	clk = clk_register(NULL, &socfpga_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(socfpga_clk);
+		return;
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(rc))
+		return;
+}
+
+void __init socfpga_a10_gate_init(struct device_node *node)
+{
+	__socfpga_gate_init(node, &gateclk_ops);
+}
diff --git a/drivers/clk/socfpga/clk-periph-a10.c b/drivers/clk/socfpga/clk-periph-a10.c
new file mode 100644
index 0000000..dcc32dd
--- /dev/null
+++ b/drivers/clk/socfpga/clk-periph-a10.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2015 Altera Corporation. All rights reserved
+ *
+ * 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.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include "clk.h"
+
+#define CLK_MGR_FREE_SHIFT		16
+#define CLK_MGR_FREE_MASK		0x7
+
+#define SOCFPGA_MPU_FREE_CLK		"mpu_free_clk"
+#define SOCFPGA_NOC_FREE_CLK		"noc_free_clk"
+#define SOCFPGA_SDMMC_FREE_CLK		"sdmmc_free_clk"
+#define to_socfpga_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
+
+static unsigned long clk_periclk_recalc_rate(struct clk_hw *hwclk,
+					     unsigned long parent_rate)
+{
+	struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(hwclk);
+	u32 div;
+
+	if (socfpgaclk->fixed_div) {
+		div = socfpgaclk->fixed_div;
+	} else if (socfpgaclk->div_reg) {
+		div = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
+		div &= div_mask(socfpgaclk->width);
+		div += 1;
+	} else {
+		div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1);
+	}
+
+	return parent_rate / div;
+}
+
+static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
+{
+	struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(hwclk);
+	u32 clk_src;
+
+	clk_src = readl(socfpgaclk->hw.reg);
+	if (streq(hwclk->init->name, SOCFPGA_MPU_FREE_CLK) ||
+	    streq(hwclk->init->name, SOCFPGA_NOC_FREE_CLK) ||
+	    streq(hwclk->init->name, SOCFPGA_SDMMC_FREE_CLK))
+		return (clk_src >> CLK_MGR_FREE_SHIFT) &
+			CLK_MGR_FREE_MASK;
+	else
+		return 0;
+}
+
+static const struct clk_ops periclk_ops = {
+	.recalc_rate = clk_periclk_recalc_rate,
+	.get_parent = clk_periclk_get_parent,
+};
+
+static __init void __socfpga_periph_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 reg;
+	struct clk *clk;
+	struct socfpga_periph_clk *periph_clk;
+	const char *clk_name = node->name;
+	const char *parent_name;
+	struct clk_init_data init;
+	int rc;
+	u32 fixed_div;
+	u32 div_reg[3];
+
+	of_property_read_u32(node, "reg", &reg);
+
+	periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
+	if (WARN_ON(!periph_clk))
+		return;
+
+	periph_clk->hw.reg = clk_mgr_a10_base_addr + reg;
+
+	rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
+	if (!rc) {
+		periph_clk->div_reg = clk_mgr_a10_base_addr + div_reg[0];
+		periph_clk->shift = div_reg[1];
+		periph_clk->width = div_reg[2];
+	} else {
+		periph_clk->div_reg = 0;
+	}
+
+	rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
+	if (rc)
+		periph_clk->fixed_div = 0;
+	else
+		periph_clk->fixed_div = fixed_div;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = ops;
+	init.flags = 0;
+
+	parent_name = of_clk_get_parent_name(node, 0);
+	init.num_parents = 1;
+	init.parent_names = &parent_name;
+
+	periph_clk->hw.hw.init = &init;
+
+	clk = clk_register(NULL, &periph_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(periph_clk);
+		return;
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+
+}
+
+void __init socfpga_a10_periph_init(struct device_node *node)
+{
+	__socfpga_periph_init(node, &periclk_ops);
+}
diff --git a/drivers/clk/socfpga/clk-pll-a10.c b/drivers/clk/socfpga/clk-pll-a10.c
new file mode 100644
index 0000000..2adc2f5
--- /dev/null
+++ b/drivers/clk/socfpga/clk-pll-a10.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2015 Altera Corporation. All rights reserved
+ *
+ * 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.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "clk.h"
+
+/* Clock Manager offsets */
+#define CLK_MGR_PLL_CLK_SRC_SHIFT	8
+#define CLK_MGR_PLL_CLK_SRC_MASK	0x3
+
+/* Clock bypass bits */
+#define SOCFPGA_PLL_BG_PWRDWN		0
+#define SOCFPGA_PLL_PWR_DOWN		1
+#define SOCFPGA_PLL_EXT_ENA		2
+#define SOCFPGA_PLL_DIVF_MASK		0x00001FFF
+#define SOCFPGA_PLL_DIVF_SHIFT	0
+#define SOCFPGA_PLL_DIVQ_MASK		0x003F0000
+#define SOCFPGA_PLL_DIVQ_SHIFT	16
+#define SOCFGPA_MAX_PARENTS	5
+
+#define SOCFPGA_MAIN_PLL_CLK		"main_pll"
+#define SOCFPGA_PERIP_PLL_CLK		"periph_pll"
+
+#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
+
+void __iomem *clk_mgr_a10_base_addr;
+
+static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
+					 unsigned long parent_rate)
+{
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+	unsigned long divf, divq, reg;
+	unsigned long long vco_freq;
+
+	/* read VCO1 reg for numerator and denominator */
+	reg = readl(socfpgaclk->hw.reg + 0x4);
+	divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT;
+	divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT;
+	vco_freq = (unsigned long long)parent_rate * (divf + 1);
+	do_div(vco_freq, (1 + divq));
+	return (unsigned long)vco_freq;
+}
+
+static u8 clk_pll_get_parent(struct clk_hw *hwclk)
+{
+	struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+	u32 pll_src;
+
+	pll_src = readl(socfpgaclk->hw.reg);
+
+	return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
+		CLK_MGR_PLL_CLK_SRC_MASK;
+}
+
+
+static struct clk_ops clk_pll_ops = {
+	.recalc_rate = clk_pll_recalc_rate,
+	.get_parent = clk_pll_get_parent,
+};
+
+static __init struct clk *__socfpga_pll_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 reg;
+	struct clk *clk;
+	struct socfpga_pll *pll_clk;
+	const char *clk_name = node->name;
+	const char *parent_name[SOCFGPA_MAX_PARENTS];
+	struct clk_init_data init;
+	struct device_node *clkmgr_np;
+	int rc;
+	int i = 0;
+
+	of_property_read_u32(node, "reg", &reg);
+
+	pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+	if (WARN_ON(!pll_clk))
+		return NULL;
+
+	clkmgr_np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
+	clk_mgr_a10_base_addr = of_iomap(clkmgr_np, 0);
+	BUG_ON(!clk_mgr_a10_base_addr);
+	pll_clk->hw.reg = clk_mgr_a10_base_addr + reg;
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = ops;
+	init.flags = 0;
+
+	while (i < SOCFGPA_MAX_PARENTS && (parent_name[i] =
+			of_clk_get_parent_name(node, i)) != NULL)
+		i++;
+	init.num_parents = i;
+	init.parent_names = parent_name;
+	pll_clk->hw.hw.init = &init;
+
+	pll_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;
+	clk_pll_ops.enable = clk_gate_ops.enable;
+	clk_pll_ops.disable = clk_gate_ops.disable;
+
+	clk = clk_register(NULL, &pll_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(pll_clk);
+		return NULL;
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	return clk;
+}
+
+void __init socfpga_a10_pll_init(struct device_node *node)
+{
+	__socfpga_pll_init(node, &clk_pll_ops);
+}
diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c
index 43db947..7564d2e 100644
--- a/drivers/clk/socfpga/clk.c
+++ b/drivers/clk/socfpga/clk.c
@@ -24,4 +24,9 @@
 CLK_OF_DECLARE(socfpga_pll_clk, "altr,socfpga-pll-clock", socfpga_pll_init);
 CLK_OF_DECLARE(socfpga_perip_clk, "altr,socfpga-perip-clk", socfpga_periph_init);
 CLK_OF_DECLARE(socfpga_gate_clk, "altr,socfpga-gate-clk", socfpga_gate_init);
-
+CLK_OF_DECLARE(socfpga_a10_pll_clk, "altr,socfpga-a10-pll-clock",
+	       socfpga_a10_pll_init);
+CLK_OF_DECLARE(socfpga_a10_perip_clk, "altr,socfpga-a10-perip-clk",
+	       socfpga_a10_periph_init);
+CLK_OF_DECLARE(socfpga_a10_gate_clk, "altr,socfpga-a10-gate-clk",
+	       socfpga_a10_gate_init);
diff --git a/drivers/clk/socfpga/clk.h b/drivers/clk/socfpga/clk.h
index b09a5d5..6989847 100644
--- a/drivers/clk/socfpga/clk.h
+++ b/drivers/clk/socfpga/clk.h
@@ -34,10 +34,14 @@
 	((((smplsel) & 0x7) << 3) | (((drvsel) & 0x7) << 0))
 
 extern void __iomem *clk_mgr_base_addr;
+extern void __iomem *clk_mgr_a10_base_addr;
 
 void __init socfpga_pll_init(struct device_node *node);
 void __init socfpga_periph_init(struct device_node *node);
 void __init socfpga_gate_init(struct device_node *node);
+void __init socfpga_a10_pll_init(struct device_node *node);
+void __init socfpga_a10_periph_init(struct device_node *node);
+void __init socfpga_a10_gate_init(struct device_node *node);
 
 struct socfpga_pll {
 	struct clk_gate	hw;
-- 
2.2.1

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