[PATCH 3/3] clk: shmobile: Add R8A7790 clocks support
Laurent Pinchart
laurent.pinchart+renesas at ideasonboard.com
Tue Oct 29 10:55:11 EDT 2013
The R8A7790 has several clocks that are too custom to be supported in a
generic driver. Those clocks can be divided in two categories:
- Fixed rate clocks with multiplier and divisor set according to boot
mode configuration
- Custom divider clocks with SoC-specific divider values
This driver supports both.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
---
.../bindings/clock/renesas,r8a7790-cpg-clocks.txt | 26 +++
drivers/clk/shmobile/Makefile | 1 +
drivers/clk/shmobile/clk-r8a7790.c | 176 +++++++++++++++++++++
include/dt-bindings/clock/r8a7790-clock.h | 10 ++
include/linux/clk/shmobile.h | 19 +++
5 files changed, 232 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/renesas,r8a7790-cpg-clocks.txt
create mode 100644 drivers/clk/shmobile/clk-r8a7790.c
create mode 100644 include/linux/clk/shmobile.h
diff --git a/Documentation/devicetree/bindings/clock/renesas,r8a7790-cpg-clocks.txt b/Documentation/devicetree/bindings/clock/renesas,r8a7790-cpg-clocks.txt
new file mode 100644
index 0000000..d889917
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/renesas,r8a7790-cpg-clocks.txt
@@ -0,0 +1,26 @@
+* Renesas R8A7790 Clock Pulse Generator (CPG)
+
+The CPG generates core clocks for the R8A7790. It includes three PLLs and
+several fixed ratio dividers.
+
+Required Properties:
+
+ - compatible: Must be "renesas,r8a7790-cpg-clocks"
+ - reg: Base address and length of the memory resource used by the CPG
+ - clocks: Reference to the parent clock
+ - #clock-cells: Must be 1
+ - clock-output-names: The name of the clocks, must be "main", "pll1",
+ "pll3", "lb", "qspi", "sdh", "sd0", "sd1".
+
+
+Example
+-------
+
+ cpg_clocks: cpg_clocks {
+ compatible = "renesas,r8a7790-cpg-clocks";
+ reg = <0 0xe6150000 0 0x1000>;
+ clocks = <&extal_clk>;
+ #clock-cells = <1>;
+ clock-output-names = "main", "pll1", "pll3", "lb",
+ "qspi", "sdh", "sd0", "sd1";
+ };
diff --git a/drivers/clk/shmobile/Makefile b/drivers/clk/shmobile/Makefile
index 3275c78..949f29e 100644
--- a/drivers/clk/shmobile/Makefile
+++ b/drivers/clk/shmobile/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_ARCH_EMEV2) += clk-emev2.o
+obj-$(CONFIG_ARCH_R8A7790) += clk-r8a7790.o
obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-div6.o
obj-$(CONFIG_ARCH_SHMOBILE_MULTI) += clk-mstp.o
diff --git a/drivers/clk/shmobile/clk-r8a7790.c b/drivers/clk/shmobile/clk-r8a7790.c
new file mode 100644
index 0000000..2e76638
--- /dev/null
+++ b/drivers/clk/shmobile/clk-r8a7790.c
@@ -0,0 +1,176 @@
+/*
+ * r8a7790 Core CPG Clocks
+ *
+ * Copyright (C) 2013 Ideas On Board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/shmobile.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/spinlock.h>
+
+#include <dt-bindings/clock/r8a7790-clock.h>
+
+#define CPG_NUM_CLOCKS (R8A7790_CLK_SD1 + 1)
+
+struct r8a7790_cpg {
+ struct clk_onecell_data data;
+ spinlock_t lock;
+ void __iomem *reg;
+};
+
+/*
+ * MD EXTAL PLL0 PLL1 PLL3
+ * 14 13 19 (MHz) *1 *1
+ *---------------------------------------------------
+ * 0 0 0 15 x 1 x172/2 x208/2 x106
+ * 0 0 1 15 x 1 x172/2 x208/2 x88
+ * 0 1 0 20 x 1 x130/2 x156/2 x80
+ * 0 1 1 20 x 1 x130/2 x156/2 x66
+ * 1 0 0 26 / 2 x200/2 x240/2 x122
+ * 1 0 1 26 / 2 x200/2 x240/2 x102
+ * 1 1 0 30 / 2 x172/2 x208/2 x106
+ * 1 1 1 30 / 2 x172/2 x208/2 x88
+ *
+ * *1 : Table 7.6 indicates VCO ouput (PLLx = VCO/2)
+ */
+#define CPG_PLL_CONFIG_INDEX(md) ((((md) & BIT(14)) >> 12) | \
+ (((md) & BIT(13)) >> 12) | \
+ (((md) & BIT(19)) >> 19))
+struct cpg_pll_config {
+ unsigned int extal_div;
+ unsigned int pll1_mult;
+ unsigned int pll3_mult;
+};
+
+static const struct cpg_pll_config cpg_pll_configs[8] = {
+ { 1, 208, 106 }, { 1, 208, 88 }, { 1, 156, 80 }, { 1, 156, 66 },
+ { 2, 240, 122 }, { 2, 240, 102 }, { 2, 208, 106 }, { 2, 208, 88 },
+};
+
+/* SDHI divisors */
+static const struct clk_div_table cpg_sdh_div_table[] = {
+ { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 },
+ { 4, 8 }, { 5, 12 }, { 6, 16 }, { 7, 18 },
+ { 8, 24 }, { 10, 36 }, { 11, 48 }, { 0, 0 },
+};
+
+static const struct clk_div_table cpg_sd01_div_table[] = {
+ { 5, 12 }, { 6, 16 }, { 7, 18 }, { 8, 24 },
+ { 10, 36 }, { 11, 48 }, { 12, 10 }, { 0, 0 },
+};
+
+static u32 cpg_mode __initdata;
+
+#define CPG_SDCKCR 0x00000074
+
+static void __init r8a7790_cpg_clocks_init(struct device_node *np)
+{
+ const struct cpg_pll_config *config;
+ struct r8a7790_cpg *cpg;
+ struct clk **clks;
+ unsigned int i;
+
+ cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
+ clks = kzalloc(CPG_NUM_CLOCKS * sizeof(*clks), GFP_KERNEL);
+ if (cpg == NULL || clks == NULL) {
+ kfree(clks);
+ kfree(cpg);
+ pr_err("%s: failed to allocate cpg\n", __func__);
+ return;
+ }
+
+ spin_lock_init(&cpg->lock);
+
+ cpg->data.clks = clks;
+ cpg->data.clk_num = CPG_NUM_CLOCKS;
+
+ cpg->reg = of_iomap(np, 0);
+ if (WARN_ON(cpg->reg == NULL)) {
+ kfree(cpg->data.clks);
+ kfree(cpg);
+ return;
+ }
+
+ config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
+
+ for (i = 0; i < CPG_NUM_CLOCKS; ++i) {
+ const struct clk_div_table *table = NULL;
+ const char *parent_name = "main";
+ const char *name;
+ unsigned int shift;
+ unsigned int mult = 1;
+ unsigned int div = 1;
+ struct clk *clk;
+
+ of_property_read_string_index(np, "clock-output-names", i,
+ &name);
+
+ switch (i) {
+ case R8A7790_CLK_MAIN:
+ parent_name = of_clk_get_parent_name(np, 0);
+ div = config->extal_div;
+ break;
+ case R8A7790_CLK_PLL1:
+ mult = config->pll1_mult / 2;
+ break;
+ case R8A7790_CLK_PLL3:
+ mult = config->pll3_mult;
+ break;
+ case R8A7790_CLK_LB:
+ div = cpg_mode & BIT(18) ? 36 : 24;
+ break;
+ case R8A7790_CLK_QSPI:
+ div = (cpg_mode & (BIT(3) | BIT(2) | BIT(1))) == BIT(2)
+ ? 16 : 20;
+ break;
+ case R8A7790_CLK_SDH:
+ table = cpg_sdh_div_table;
+ shift = 8;
+ break;
+ case R8A7790_CLK_SD0:
+ table = cpg_sd01_div_table;
+ shift = 4;
+ break;
+ case R8A7790_CLK_SD1:
+ table = cpg_sd01_div_table;
+ shift = 0;
+ break;
+ }
+
+ if (!table)
+ clk = clk_register_fixed_factor(NULL, name, parent_name,
+ 0, mult, div);
+ else
+ clk = clk_register_divider_table(NULL, name,
+ parent_name, 0,
+ cpg->reg + CPG_SDCKCR,
+ shift, 4, 0, table,
+ &cpg->lock);
+
+ if (IS_ERR(clk))
+ pr_err("%s: failed to register %s %s clock (%ld)\n",
+ __func__, np->name, name, PTR_ERR(clk));
+ }
+
+ of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
+}
+CLK_OF_DECLARE(r8a7790_cpg_clks, "renesas,r8a7790-cpg-clocks",
+ r8a7790_cpg_clocks_init);
+
+void __init r8a7790_clocks_init(u32 mode)
+{
+ cpg_mode = mode;
+
+ of_clk_init(NULL);
+}
diff --git a/include/dt-bindings/clock/r8a7790-clock.h b/include/dt-bindings/clock/r8a7790-clock.h
index 19f2b48..f0ed742 100644
--- a/include/dt-bindings/clock/r8a7790-clock.h
+++ b/include/dt-bindings/clock/r8a7790-clock.h
@@ -10,6 +10,16 @@
#ifndef __DT_BINDINGS_CLOCK_R8A7790_H__
#define __DT_BINDINGS_CLOCK_R8A7790_H__
+/* CPG */
+#define R8A7790_CLK_MAIN 0
+#define R8A7790_CLK_PLL1 1
+#define R8A7790_CLK_PLL3 2
+#define R8A7790_CLK_LB 3
+#define R8A7790_CLK_QSPI 4
+#define R8A7790_CLK_SDH 5
+#define R8A7790_CLK_SD0 6
+#define R8A7790_CLK_SD1 7
+
/* MSTP1 */
#define R8A7790_CLK_CMT0 20
diff --git a/include/linux/clk/shmobile.h b/include/linux/clk/shmobile.h
new file mode 100644
index 0000000..b090855
--- /dev/null
+++ b/include/linux/clk/shmobile.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2013 Ideas On Board SPRL
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_CLK_SHMOBILE_H_
+#define __LINUX_CLK_SHMOBILE_H_
+
+#include <linux/types.h>
+
+void r8a7790_clocks_init(u32 mode);
+
+#endif
--
1.8.1.5
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