[PATCH] clk: Add clock driver for AXM55xx SoC
Anders Berg
anders.berg at avagotech.com
Thu May 15 06:42:25 PDT 2014
From: Anders Berg <anders.berg at lsi.com>
Add clk driver to support clock blocks found on the AXM55xx devices. The driver
provides clock implementations for three different types of clock devices on
the AXM55xx device: PLL clock, a clock divider and a clock mux.
Signed-off-by: Anders Berg <anders.berg at lsi.com>
Cc: Mike Turquette <mturquette at linaro.org>
Cc: Mark Rutland <mark.rutland at arm.com>
---
.../devicetree/bindings/clock/lsi,axm5516-clks.txt | 29 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-axm5516.c | 615 +++++++++++++++++++++
3 files changed, 645 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/lsi,axm5516-clks.txt
create mode 100644 drivers/clk/clk-axm5516.c
diff --git a/Documentation/devicetree/bindings/clock/lsi,axm5516-clks.txt b/Documentation/devicetree/bindings/clock/lsi,axm5516-clks.txt
new file mode 100644
index 0000000..3ce97cf
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/lsi,axm5516-clks.txt
@@ -0,0 +1,29 @@
+AXM5516 clock driver bindings
+-----------------------------
+
+Required properties :
+- compatible : shall contain "lsi,axm5516-clks"
+- reg : shall contain base register location and length
+- #clock-cells : shall contain 1
+
+The consumer specifies the desired clock by having the clock ID in its "clocks"
+phandle cell. See <dt-bindings/clock/lsi,axxia-clock.h> for the list of
+supported clock IDs.
+
+Example:
+
+ clks: clock-controller at 2010020000 {
+ compatible = "lsi,axm5516-clks";
+ #clock-cells = <1>;
+ reg = <0x20 0x10020000 0 0x20000>;
+ };
+
+ serial0: uart at 2010080000 {
+ compatible = "arm,pl011", "arm,primecell";
+ reg = <0x20 0x10080000 0 0x1000>;
+ interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&clks AXXIA_CLK_PER>;
+ clock-names = "apb_pclk";
+ };
+ };
+
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 5f8a287..32051e7 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o
# hardware specific clock types
# please keep this section sorted lexicographically by file/directory path name
obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o
+obj-$(CONFIG_ARCH_AXXIA) += clk-axm5516.o
obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o
obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o
obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
diff --git a/drivers/clk/clk-axm5516.c b/drivers/clk/clk-axm5516.c
new file mode 100644
index 0000000..d2f1e11
--- /dev/null
+++ b/drivers/clk/clk-axm5516.c
@@ -0,0 +1,615 @@
+/*
+ * drivers/clk/clk-axm5516.c
+ *
+ * Provides clock implementations for three different types of clock devices on
+ * the Axxia device: PLL clock, a clock divider and a clock mux.
+ *
+ * Copyright (C) 2014 LSI Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+#include <dt-bindings/clock/lsi,axm5516-clks.h>
+
+
+/**
+ * struct axxia_clk - Common struct to all Axxia clocks.
+ * @hw: clk_hw for the common clk framework
+ * @regmap: Regmap for the clock control registers
+ */
+struct axxia_clk {
+ struct clk_hw hw;
+ struct regmap *regmap;
+};
+#define to_axxia_clk(_hw) container_of(_hw, struct axxia_clk, hw)
+
+/**
+ * struct axxia_pllclk - Axxia PLL generated clock.
+ * @aclk: Common struct
+ * @reg: Offset into regmap for PLL control register
+ */
+struct axxia_pllclk {
+ struct axxia_clk aclk;
+ u32 reg;
+};
+#define to_axxia_pllclk(_aclk) container_of(_aclk, struct axxia_pllclk, aclk)
+
+/**
+ * axxia_pllclk_recalc - Calculate the PLL generated clock rate given the
+ * parent clock rate.
+ */
+static unsigned long
+axxia_pllclk_recalc(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct axxia_clk *aclk = to_axxia_clk(hw);
+ struct axxia_pllclk *pll = to_axxia_pllclk(aclk);
+ unsigned long rate, fbdiv, refdiv, postdiv;
+ u32 control;
+
+ regmap_read(aclk->regmap, pll->reg, &control);
+ postdiv = ((control >> 0) & 0xf) + 1;
+ fbdiv = ((control >> 4) & 0xfff) + 3;
+ refdiv = ((control >> 16) & 0x1f) + 1;
+ rate = (parent_rate / (refdiv * postdiv)) * fbdiv;
+
+ return rate;
+}
+
+static const struct clk_ops axxia_pllclk_ops = {
+ .recalc_rate = axxia_pllclk_recalc,
+};
+
+/**
+ * struct axxia_divclk - Axxia clock divider
+ * @aclk: Common struct
+ * @reg: Offset into regmap for PLL control register
+ * @shift: Bit position for divider value
+ * @width: Number of bits in divider value
+ */
+struct axxia_divclk {
+ struct axxia_clk aclk;
+ u32 reg;
+ u32 shift;
+ u32 width;
+};
+#define to_axxia_divclk(_aclk) container_of(_aclk, struct axxia_divclk, aclk)
+
+/**
+ * axxia_divclk_recalc_rate - Calculate clock divider output rage
+ */
+static unsigned long
+axxia_divclk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ struct axxia_clk *aclk = to_axxia_clk(hw);
+ struct axxia_divclk *divclk = to_axxia_divclk(aclk);
+ u32 ctrl, div;
+
+ regmap_read(aclk->regmap, divclk->reg, &ctrl);
+ div = 1 + ((ctrl >> divclk->shift) & ((1 << divclk->width)-1));
+
+ return parent_rate / div;
+}
+
+static const struct clk_ops axxia_divclk_ops = {
+ .recalc_rate = axxia_divclk_recalc_rate,
+};
+
+/**
+ * struct axxia_clkmux - Axxia clock mux
+ * @aclk: Common struct
+ * @reg: Offset into regmap for PLL control register
+ * @shift: Bit position for selection value
+ * @width: Number of bits in selection value
+ */
+struct axxia_clkmux {
+ struct axxia_clk aclk;
+ u32 reg;
+ u32 shift;
+ u32 width;
+};
+#define to_axxia_clkmux(_aclk) container_of(_aclk, struct axxia_clkmux, aclk)
+
+/**
+ * axxia_clkmux_get_parent - Return the index of selected parent clock
+ */
+static u8 axxia_clkmux_get_parent(struct clk_hw *hw)
+{
+ struct axxia_clk *aclk = to_axxia_clk(hw);
+ struct axxia_clkmux *mux = to_axxia_clkmux(aclk);
+ u32 ctrl, parent;
+
+ regmap_read(aclk->regmap, mux->reg, &ctrl);
+ parent = (ctrl >> mux->shift) & ((1 << mux->width) - 1);
+
+ return (u8) parent;
+}
+
+static const struct clk_ops axxia_clkmux_ops = {
+ .get_parent = axxia_clkmux_get_parent,
+};
+
+
+/*
+ * PLLs
+ */
+
+static struct axxia_pllclk clk_fab_pll = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_fab_pll",
+ .parent_names = (const char *[]){
+ "clk_ref0"
+ },
+ .num_parents = 1,
+ .ops = &axxia_pllclk_ops,
+ },
+ .reg = 0x01800,
+};
+
+static struct axxia_pllclk clk_cpu_pll = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu_pll",
+ .parent_names = (const char *[]){
+ "clk_ref0"
+ },
+ .num_parents = 1,
+ .ops = &axxia_pllclk_ops,
+ },
+ .reg = 0x02000,
+};
+
+static struct axxia_pllclk clk_sys_pll = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_sys_pll",
+ .parent_names = (const char *[]){
+ "clk_ref0"
+ },
+ .num_parents = 1,
+ .ops = &axxia_pllclk_ops,
+ },
+ .reg = 0x02800,
+};
+
+static struct axxia_pllclk clk_sm0_pll = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_sm0_pll",
+ .parent_names = (const char *[]){
+ "clk_ref2"
+ },
+ .num_parents = 1,
+ .ops = &axxia_pllclk_ops,
+ },
+ .reg = 0x03000,
+};
+
+static struct axxia_pllclk clk_sm1_pll = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_sm1_pll",
+ .parent_names = (const char *[]){
+ "clk_ref1"
+ },
+ .num_parents = 1,
+ .ops = &axxia_pllclk_ops,
+ },
+ .reg = 0x03800,
+};
+
+/*
+ * Clock dividers
+ */
+
+static struct axxia_divclk clk_cpu0_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu0_div",
+ .parent_names = (const char *[]){
+ "clk_cpu_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x10008,
+ .shift = 0,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_cpu1_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu1_div",
+ .parent_names = (const char *[]){
+ "clk_cpu_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x10008,
+ .shift = 4,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_cpu2_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu2_div",
+ .parent_names = (const char *[]){
+ "clk_cpu_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x10008,
+ .shift = 8,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_cpu3_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu3_div",
+ .parent_names = (const char *[]){
+ "clk_cpu_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x10008,
+ .shift = 12,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_nrcp_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_nrcp_div",
+ .parent_names = (const char *[]){
+ "clk_sys_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x1000c,
+ .shift = 0,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_sys_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_sys_div",
+ .parent_names = (const char *[]){
+ "clk_sys_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x1000c,
+ .shift = 4,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_fab_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_fab_div",
+ .parent_names = (const char *[]){
+ "clk_fab_pll"
+ },
+ .num_parents = 1,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x1000c,
+ .shift = 8,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_per_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_per_div",
+ .parent_names = (const char *[]){
+ "clk_sm1_pll"
+ },
+ .num_parents = 1,
+ .flags = CLK_IS_BASIC,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x1000c,
+ .shift = 12,
+ .width = 4,
+};
+
+static struct axxia_divclk clk_mmc_div = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_mmc_div",
+ .parent_names = (const char *[]){
+ "clk_sm1_pll"
+ },
+ .num_parents = 1,
+ .flags = CLK_IS_BASIC,
+ .ops = &axxia_divclk_ops,
+ },
+ .reg = 0x1000c,
+ .shift = 16,
+ .width = 4,
+};
+
+/*
+ * Clock MUXes
+ */
+
+static struct axxia_clkmux clk_cpu0_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu0",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_cpu_pll",
+ "clk_cpu0_div",
+ "clk_cpu0_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10000,
+ .shift = 0,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_cpu1_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu1",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_cpu_pll",
+ "clk_cpu1_div",
+ "clk_cpu1_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10000,
+ .shift = 2,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_cpu2_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu2",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_cpu_pll",
+ "clk_cpu2_div",
+ "clk_cpu2_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10000,
+ .shift = 4,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_cpu3_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_cpu3",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_cpu_pll",
+ "clk_cpu3_div",
+ "clk_cpu3_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10000,
+ .shift = 6,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_nrcp_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_nrcp",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_sys_pll",
+ "clk_nrcp_div",
+ "clk_nrcp_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10004,
+ .shift = 0,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_sys_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_sys",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_sys_pll",
+ "clk_sys_div",
+ "clk_sys_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10004,
+ .shift = 2,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_fab_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_fab",
+ .parent_names = (const char *[]){
+ "clk_ref0",
+ "clk_fab_pll",
+ "clk_fab_div",
+ "clk_fab_div"
+ },
+ .num_parents = 4,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10004,
+ .shift = 4,
+ .width = 2,
+};
+
+static struct axxia_clkmux clk_per_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_per",
+ .parent_names = (const char *[]){
+ "clk_ref1",
+ "clk_per_div"
+ },
+ .num_parents = 2,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10004,
+ .shift = 6,
+ .width = 1,
+};
+
+static struct axxia_clkmux clk_mmc_mux = {
+ .aclk.hw.init = &(struct clk_init_data){
+ .name = "clk_mmc",
+ .parent_names = (const char *[]){
+ "clk_ref1",
+ "clk_mmc_div"
+ },
+ .num_parents = 2,
+ .ops = &axxia_clkmux_ops,
+ },
+ .reg = 0x10004,
+ .shift = 9,
+ .width = 1,
+};
+
+/* Table of all supported clocks indexed by the clock identifiers from the
+ * device tree binding
+ */
+static struct axxia_clk *axmclk_clocks[] = {
+ [AXXIA_CLK_FAB_PLL] = &clk_fab_pll.aclk,
+ [AXXIA_CLK_CPU_PLL] = &clk_cpu_pll.aclk,
+ [AXXIA_CLK_SYS_PLL] = &clk_sys_pll.aclk,
+ [AXXIA_CLK_SM0_PLL] = &clk_sm0_pll.aclk,
+ [AXXIA_CLK_SM1_PLL] = &clk_sm1_pll.aclk,
+ [AXXIA_CLK_FAB_DIV] = &clk_fab_div.aclk,
+ [AXXIA_CLK_SYS_DIV] = &clk_sys_div.aclk,
+ [AXXIA_CLK_NRCP_DIV] = &clk_nrcp_div.aclk,
+ [AXXIA_CLK_CPU0_DIV] = &clk_cpu0_div.aclk,
+ [AXXIA_CLK_CPU1_DIV] = &clk_cpu1_div.aclk,
+ [AXXIA_CLK_CPU2_DIV] = &clk_cpu2_div.aclk,
+ [AXXIA_CLK_CPU3_DIV] = &clk_cpu3_div.aclk,
+ [AXXIA_CLK_PER_DIV] = &clk_per_div.aclk,
+ [AXXIA_CLK_MMC_DIV] = &clk_mmc_div.aclk,
+ [AXXIA_CLK_FAB] = &clk_fab_mux.aclk,
+ [AXXIA_CLK_SYS] = &clk_sys_mux.aclk,
+ [AXXIA_CLK_NRCP] = &clk_nrcp_mux.aclk,
+ [AXXIA_CLK_CPU0] = &clk_cpu0_mux.aclk,
+ [AXXIA_CLK_CPU1] = &clk_cpu1_mux.aclk,
+ [AXXIA_CLK_CPU2] = &clk_cpu2_mux.aclk,
+ [AXXIA_CLK_CPU3] = &clk_cpu3_mux.aclk,
+ [AXXIA_CLK_PER] = &clk_per_mux.aclk,
+ [AXXIA_CLK_MMC] = &clk_mmc_mux.aclk,
+};
+
+static const struct regmap_config axmclk_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x1fffc,
+ .fast_io = true,
+};
+
+static const struct of_device_id axmclk_match_table[] = {
+ { .compatible = "lsi,axm5516-clks" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, axmclk_match_table);
+
+struct axmclk_priv {
+ struct clk_onecell_data onecell;
+ struct clk *clks[];
+};
+
+static int axmclk_probe(struct platform_device *pdev)
+{
+ void __iomem *base;
+ struct resource *res;
+ int i, ret;
+ struct device *dev = &pdev->dev;
+ struct clk *clk;
+ struct regmap *regmap;
+ size_t num_clks;
+ struct axmclk_priv *priv;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(dev, base, &axmclk_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ num_clks = ARRAY_SIZE(axmclk_clocks);
+ pr_info("axmclk: supporting %u clocks\n", num_clks);
+ priv = devm_kzalloc(dev, sizeof(*priv) + sizeof(*priv->clks) * num_clks,
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->onecell.clks = priv->clks;
+ priv->onecell.clk_num = num_clks;
+
+ /* Update each entry with the allocated regmap and register the clock
+ * with the common clock framework
+ */
+ for (i = 0; i < num_clks; i++) {
+ axmclk_clocks[i]->regmap = regmap;
+ clk = devm_clk_register(dev, &axmclk_clocks[i]->hw);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+ priv->clks[i] = clk;
+ }
+
+ ret = of_clk_add_provider(dev->of_node,
+ of_clk_src_onecell_get, &priv->onecell);
+
+ return ret;
+}
+
+static int axmclk_remove(struct platform_device *pdev)
+{
+ of_clk_del_provider(pdev->dev.of_node);
+ return 0;
+}
+
+static struct platform_driver axmclk_driver = {
+ .probe = axmclk_probe,
+ .remove = axmclk_remove,
+ .driver = {
+ .name = "clk-axm5516",
+ .owner = THIS_MODULE,
+ .of_match_table = axmclk_match_table,
+ },
+};
+
+static int __init axmclk_init(void)
+{
+ return platform_driver_register(&axmclk_driver);
+}
+core_initcall(axmclk_init);
+
+static void __exit axmclk_exit(void)
+{
+ platform_driver_unregister(&axmclk_driver);
+}
+module_exit(axmclk_exit);
+
+MODULE_DESCRIPTION("AXM5516 clock driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:clk-axm5516");
--
1.8.3.2
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