[PATCH 5/7] clk: socfpga: add arria10 clk drivers
Steffen Trumtrar
s.trumtrar at pengutronix.de
Mon Apr 3 03:55:21 PDT 2017
Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
---
drivers/clk/socfpga/Makefile | 2 +
drivers/clk/socfpga/clk-gate-a10.c | 197 +++++++++++++++++++++++++++++++++++
drivers/clk/socfpga/clk-periph-a10.c | 130 +++++++++++++++++++++++
drivers/clk/socfpga/clk-pll-a10.c | 143 +++++++++++++++++++++++++
drivers/clk/socfpga/clk.c | 11 +-
drivers/clk/socfpga/clk.h | 90 ++++++++++++++++
6 files changed, 572 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
create mode 100644 drivers/clk/socfpga/clk.h
diff --git a/drivers/clk/socfpga/Makefile b/drivers/clk/socfpga/Makefile
index fc216adb744e..341e6433e560 100644
--- a/drivers/clk/socfpga/Makefile
+++ b/drivers/clk/socfpga/Makefile
@@ -1 +1,3 @@
obj-y += clk.o
+
+obj-$(CONFIG_ARCH_SOCFPGA_ARRIA10) += clk-gate-a10.o clk-periph-a10.o clk-pll-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 000000000000..07f6026c2e8d
--- /dev/null
+++ b/drivers/clk/socfpga/clk-gate-a10.c
@@ -0,0 +1,197 @@
+/*
+ * 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 <common.h>
+#include <io.h>
+#include <malloc.h>
+#include <regmap.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <mach/arria10-regs.h>
+#include <mach/arria10-system-manager.h>
+
+#include "clk.h"
+
+#define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, clk)
+
+/* SDMMC Group for System Manager defines */
+#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x28
+
+static unsigned long socfpga_gate_clk_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(clk);
+ 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 &= GENMASK(socfpgaclk->width - 1, 0);
+ div = (1 << val);
+ }
+
+ return parent_rate / div;
+}
+
+static int socfpga_clk_prepare(struct clk *clk)
+{
+ struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(clk);
+ int i;
+ u32 hs_timing;
+ u32 clk_phase[2];
+
+ if (socfpgaclk->clk_phase[0] || socfpgaclk->clk_phase[1]) {
+ for (i = 0; i < ARRAY_SIZE(clk_phase); 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]);
+ writel(hs_timing, ARRIA10_SYSMGR_SDMMC);
+ }
+ return 0;
+}
+
+static int clk_socfpga_enable(struct clk *clk)
+{
+ struct socfpga_gate_clk *socfpga_clk = to_socfpga_gate_clk(clk);
+ u32 val;
+
+ socfpga_clk_prepare(clk);
+
+ val = readl(socfpga_clk->reg);
+ val |= 1 << socfpga_clk->bit_idx;
+ writel(val, socfpga_clk->reg);
+
+ return 0;
+}
+
+static void clk_socfpga_disable(struct clk *clk)
+{
+ struct socfpga_gate_clk *socfpga_clk = to_socfpga_gate_clk(clk);
+ u32 val;
+
+ val = readl(socfpga_clk->reg);
+ val &= ~(1 << socfpga_clk->shift);
+ writel(val, socfpga_clk->reg);
+}
+
+static struct clk_ops gateclk_ops = {
+ .recalc_rate = socfpga_gate_clk_recalc_rate,
+};
+
+static struct clk *__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 socfpga_gate_clk *socfpga_clk;
+ const char *clk_name = node->name;
+ int rc;
+ int i;
+
+ socfpga_clk = xzalloc(sizeof(*socfpga_clk));
+
+ rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
+ if (rc)
+ clk_gate[0] = 0;
+
+ if (clk_gate[0]) {
+ socfpga_clk->reg = clk_mgr_base_addr + clk_gate[0];
+ socfpga_clk->bit_idx = clk_gate[1];
+
+ gateclk_ops.enable = clk_socfpga_enable;
+ gateclk_ops.disable = clk_socfpga_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_base_addr + div_reg[0];
+ socfpga_clk->shift = div_reg[1];
+ socfpga_clk->width = div_reg[2];
+ } else {
+ socfpga_clk->div_reg = NULL;
+ }
+
+ 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);
+
+ socfpga_clk->clk.name = xstrdup(clk_name);
+ socfpga_clk->clk.ops = ops;
+
+ for (i = 0; i < SOCFPGA_MAX_PARENTS; i++) {
+ socfpga_clk->parent_names[i] = of_clk_get_parent_name(node, i);
+ if (!socfpga_clk->parent_names[i])
+ break;
+ }
+
+ socfpga_clk->clk.num_parents = i;
+ socfpga_clk->clk.parent_names = socfpga_clk->parent_names;
+
+ rc = clk_register(&socfpga_clk->clk);
+ if (rc) {
+ free(socfpga_clk);
+ return ERR_PTR(rc);
+ }
+
+ return &socfpga_clk->clk;
+}
+
+struct clk *socfpga_a10_gate_init(struct device_node *node)
+{
+ return __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 000000000000..9dd7fc9c2552
--- /dev/null
+++ b/drivers/clk/socfpga/clk-periph-a10.c
@@ -0,0 +1,130 @@
+/*
+ * 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 <common.h>
+#include <io.h>
+#include <malloc.h>
+#include <linux/clk.h>
+#include <linux/clkdev.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, clk)
+
+static unsigned long clk_periclk_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(clk);
+ u32 div;
+
+ if (socfpgaclk->fixed_div) {
+ div = socfpgaclk->fixed_div;
+ } else if (socfpgaclk->div_reg) {
+ div = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
+ div &= GENMASK(socfpgaclk->width - 1, 0);
+ div += 1;
+ } else {
+ div = ((readl(socfpgaclk->reg) & 0x7ff) + 1);
+ }
+
+ return parent_rate / div;
+}
+
+static int clk_periclk_get_parent(struct clk *clk)
+{
+ struct socfpga_periph_clk *socfpgaclk = to_socfpga_periph_clk(clk);
+ u32 clk_src;
+
+ clk_src = readl(socfpgaclk->reg);
+ if (streq(clk->name, SOCFPGA_MPU_FREE_CLK) ||
+ streq(clk->name, SOCFPGA_NOC_FREE_CLK) ||
+ streq(clk->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 struct clk *__socfpga_periph_init(struct device_node *node,
+ const struct clk_ops *ops)
+{
+ u32 reg;
+ struct socfpga_periph_clk *periph_clk;
+ const char *clk_name = node->name;
+ int rc;
+ u32 fixed_div;
+ u32 div_reg[3];
+ int i;
+
+ of_property_read_u32(node, "reg", ®);
+
+ periph_clk = xzalloc(sizeof(*periph_clk));
+
+ periph_clk->reg = clk_mgr_base_addr + reg;
+
+ rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
+ if (!rc) {
+ periph_clk->div_reg = clk_mgr_base_addr + div_reg[0];
+ periph_clk->shift = div_reg[1];
+ periph_clk->width = div_reg[2];
+ } else {
+ periph_clk->div_reg = NULL;
+ }
+
+ 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);
+
+ for (i = 0; i < SOCFPGA_MAX_PARENTS; i++) {
+ periph_clk->parent_names[i] = of_clk_get_parent_name(node, i);
+ if (!periph_clk->parent_names[i])
+ break;
+ }
+
+ periph_clk->clk.num_parents = i;
+ periph_clk->clk.parent_names = periph_clk->parent_names;
+
+ periph_clk->clk.name = xstrdup(clk_name);
+ periph_clk->clk.ops = ops;
+
+ rc = clk_register(&periph_clk->clk);
+ if (rc) {
+ free(periph_clk);
+ return ERR_PTR(rc);
+ }
+
+ return &periph_clk->clk;
+}
+
+struct clk *socfpga_a10_periph_init(struct device_node *node)
+{
+ return __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 000000000000..4dae3e537bc2
--- /dev/null
+++ b/drivers/clk/socfpga/clk-pll-a10.c
@@ -0,0 +1,143 @@
+/*
+ * 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 <common.h>
+#include <io.h>
+#include <malloc.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <asm-generic/div64.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, clk)
+
+static unsigned long clk_pll_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(clk);
+ unsigned long divf, divq, reg;
+ unsigned long long vco_freq;
+
+ /* read VCO1 reg for numerator and denominator */
+ reg = readl(socfpgaclk->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 int clk_pll_get_parent(struct clk *clk)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(clk);
+ u32 pll_src;
+
+ pll_src = readl(socfpgaclk->reg);
+
+ return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
+ CLK_MGR_PLL_CLK_SRC_MASK;
+}
+
+static int clk_socfpga_enable(struct clk *clk)
+{
+ struct socfpga_pll *socfpga_clk = to_socfpga_clk(clk);
+ u32 val;
+
+ val = readl(socfpga_clk->reg);
+ val |= 1 << socfpga_clk->bit_idx;
+ writel(val, socfpga_clk->reg);
+
+ return 0;
+}
+
+static void clk_socfpga_disable(struct clk *clk)
+{
+ struct socfpga_pll *socfpga_clk = to_socfpga_clk(clk);
+ u32 val;
+
+ val = readl(socfpga_clk->reg);
+ val &= ~(1 << socfpga_clk->bit_idx);
+ writel(val, socfpga_clk->reg);
+}
+
+static struct clk_ops clk_pll_ops = {
+ .recalc_rate = clk_pll_recalc_rate,
+ .get_parent = clk_pll_get_parent,
+};
+
+static struct clk *__socfpga_pll_init(struct device_node *node,
+ const struct clk_ops *ops)
+{
+ u32 reg;
+ struct socfpga_pll *pll_clk;
+ const char *clk_name = node->name;
+ int rc;
+ int i;
+
+ of_property_read_u32(node, "reg", ®);
+
+ pll_clk = xzalloc(sizeof(*pll_clk));
+
+ pll_clk->reg = clk_mgr_base_addr + reg;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ pll_clk->clk.name = xstrdup(clk_name);
+ pll_clk->clk.ops = ops;
+
+ for (i = 0; i < SOCFPGA_MAX_PARENTS; i++) {
+ pll_clk->parent_names[i] = of_clk_get_parent_name(node, i);
+ if (!pll_clk->parent_names[i])
+ break;
+ }
+
+ pll_clk->bit_idx = SOCFPGA_PLL_EXT_ENA;
+ pll_clk->clk.num_parents = i;
+ pll_clk->clk.parent_names = pll_clk->parent_names;
+
+ clk_pll_ops.enable = clk_socfpga_enable;
+ clk_pll_ops.disable = clk_socfpga_disable;
+
+ rc = clk_register(&pll_clk->clk);
+ if (rc) {
+ free(pll_clk);
+ return NULL;
+ }
+
+ return &pll_clk->clk;
+}
+
+struct clk *socfpga_a10_pll_init(struct device_node *node)
+{
+ return __socfpga_pll_init(node, &clk_pll_ops);
+}
diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c
index 6af0632cafc2..ade608ffe314 100644
--- a/drivers/clk/socfpga/clk.c
+++ b/drivers/clk/socfpga/clk.c
@@ -12,6 +12,7 @@
*/
#include <common.h>
+#include <debug_ll.h>
#include <init.h>
#include <driver.h>
#include <linux/clk.h>
@@ -20,6 +21,8 @@
#include <linux/clkdev.h>
#include <linux/err.h>
+#include "clk.h"
+
/* Clock Manager offsets */
#define CLKMGR_CTRL 0x0
#define CLKMGR_BYPASS 0x4
@@ -52,7 +55,7 @@
#define div_mask(width) ((1 << (width)) - 1)
#define streq(a, b) (strcmp((a), (b)) == 0)
-static void __iomem *clk_mgr_base_addr;
+void __iomem *clk_mgr_base_addr;
struct clk_pll {
struct clk clk;
@@ -385,6 +388,12 @@ static void socfpga_register_clocks(struct device_d *dev, struct device_node *no
clk = socfpga_periph_clk(node);
else if (of_device_is_compatible(node, "altr,socfpga-gate-clk"))
clk = socfpga_gate_clk(node);
+ else if (of_device_is_compatible(node, "altr,socfpga-a10-pll-clock"))
+ clk = socfpga_a10_pll_init(node);
+ else if (of_device_is_compatible(node, "altr,socfpga-a10-perip-clk"))
+ clk = socfpga_a10_periph_init(node);
+ else if (of_device_is_compatible(node, "altr,socfpga-a10-gate-clk"))
+ clk = socfpga_a10_gate_init(node);
else
return;
diff --git a/drivers/clk/socfpga/clk.h b/drivers/clk/socfpga/clk.h
new file mode 100644
index 000000000000..6d6c28344df4
--- /dev/null
+++ b/drivers/clk/socfpga/clk.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2013, Steffen Trumtrar <s.trumtrar at pengutronix.de>
+ *
+ * based on drivers/clk/tegra/clk.h
+ *
+ * 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.
+ *
+ */
+
+#ifndef __SOCFPGA_CLK_H
+#define __SOCFPGA_CLK_H
+
+#include <linux/clk.h>
+
+/* Clock Manager offsets */
+#define CLKMGR_CTRL 0x0
+#define CLKMGR_BYPASS 0x4
+#define CLKMGR_DBCTRL 0x10
+#define CLKMGR_L4SRC 0x70
+#define CLKMGR_PERPLL_SRC 0xAC
+
+#define SOCFPGA_MAX_PARENTS 5
+
+#define streq(a, b) (strcmp((a), (b)) == 0)
+
+extern void __iomem *clk_mgr_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);
+
+#ifdef CONFIG_ARCH_SOCFPGA_ARRIA10
+struct clk *socfpga_a10_pll_init(struct device_node *node);
+struct clk *socfpga_a10_periph_init(struct device_node *node);
+struct clk *socfpga_a10_gate_init(struct device_node *node);
+#else
+struct clk *socfpga_a10_pll_init(struct device_node *node)
+{
+ return ERR_PTR(-ENOSYS);
+}
+struct clk *socfpga_a10_periph_init(struct device_node *node)
+{
+ return ERR_PTR(-ENOSYS);
+}
+struct clk *socfpga_a10_gate_init(struct device_node *node)
+{
+ return ERR_PTR(-ENOSYS);
+}
+#endif
+
+struct socfpga_pll {
+ struct clk clk;
+ void __iomem *reg;
+ u32 bit_idx;
+ const char *parent_names[SOCFPGA_MAX_PARENTS];
+};
+
+struct socfpga_gate_clk {
+ struct clk clk;
+ char *parent_name;
+ u32 fixed_div;
+ void __iomem *div_reg;
+ struct regmap *sys_mgr_base_addr;
+ u32 width; /* only valid if div_reg != 0 */
+ u32 shift; /* only valid if div_reg != 0 */
+ u32 bit_idx;
+ void __iomem *reg;
+ u32 clk_phase[2];
+ const char *parent_names[SOCFPGA_MAX_PARENTS];
+};
+
+struct socfpga_periph_clk {
+ struct clk clk;
+ void __iomem *reg;
+ char *parent_name;
+ u32 fixed_div;
+ void __iomem *div_reg;
+ u32 width; /* only valid if div_reg != 0 */
+ u32 shift; /* only valid if div_reg != 0 */
+ const char *parent_names[SOCFPGA_MAX_PARENTS];
+};
+
+#endif /* SOCFPGA_CLK_H */
--
2.11.0
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