clk: sunxi: Add driver for A80 MMC config clocks/resets

On the A80 SoC, the 4 mmc controllers each have a separate register
controlling their register access clocks and reset controls. These
registers in turn share a ahb clock gate and reset control.

This patch adds a platform device driver for these controls. It
requires both clocks and reset controls to be available, so using
CLK_OF_DECLARE might not be the best way.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 0dfd018..60b4428 100644 (file)
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -57,6 +57,7 @@ Required properties:
        "allwinner,sun5i-a13-mbus-clk" - for the MBUS clock on A13
        "allwinner,sun4i-a10-mmc-clk" - for the MMC clock
        "allwinner,sun9i-a80-mmc-clk" - for mmc module clocks on A80
+       "allwinner,sun9i-a80-mmc-config-clk" - for mmc gates + resets on A80
        "allwinner,sun4i-a10-mod0-clk" - for the module 0 family of clocks
        "allwinner,sun9i-a80-mod0-clk" - for module 0 (storage) clocks on A80
        "allwinner,sun8i-a23-mbus-clk" - for the MBUS clock on A23
@@ -75,7 +76,8 @@ Required properties for all clocks:
        the following compatibles where it shall be set to 1:
        "allwinner,*-gates-clk", "allwinner,sun4i-pll5-clk",
        "allwinner,sun4i-pll6-clk", "allwinner,sun6i-a31-pll6-clk",
-       "allwinner,*-usb-clk", "allwinner,*-mmc-clk"
+       "allwinner,*-usb-clk", "allwinner,*-mmc-clk",
+       "allwinner,*-mmc-config-clk"
 - clock-output-names : shall be the corresponding names of the outputs.
        If the clock module only has one output, the name shall be the
        module name.
@@ -83,6 +85,10 @@ Required properties for all clocks:
 And "allwinner,*-usb-clk" clocks also require:
 - reset-cells : shall be set to 1
 
+The "allwinner,sun9i-a80-mmc-config-clk" clock also requires:
+- #reset-cells : shall be set to 1
+- resets : shall be the reset control phandle for the mmc block.
+
 For "allwinner,sun7i-a20-gmac-clk", the parent clocks shall be fixed rate
 dummy clocks at 25 MHz and 125 MHz, respectively. See example.
 
@@ -101,6 +107,10 @@ The "allwinner,*-mmc-clk" clocks have three different outputs: the
 main clock, with the ID 0, and the output and sample clocks, with the
 IDs 1 and 2, respectively.
 
+The "allwinner,sun9i-a80-mmc-config-clk" clock has one clock/reset output
+per mmc controller. The number of outputs is determined by the size of
+the address block, which is related to the overall mmc block.
+
 For example:
 
 osc24M: clk@01c20050 {
@@ -176,3 +186,16 @@ gmac_clk: clk@01c20164 {
        clocks = <&mii_phy_tx_clk>, <&gmac_int_tx_clk>;
        clock-output-names = "gmac";
 };
+
+mmc_config_clk: clk@01c13000 {
+       compatible = "allwinner,sun9i-a80-mmc-config-clk";
+       reg = <0x01c13000 0x10>;
+       clocks = <&ahb0_gates 8>;
+       clock-names = "ahb";
+       resets = <&ahb0_resets 8>;
+       reset-names = "ahb";
+       #clock-cells = <1>;
+       #reset-cells = <1>;
+       clock-output-names = "mmc0_config", "mmc1_config",
+                            "mmc2_config", "mmc3_config";
+};

diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index a66953c..3a5292e 100644 (file)
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -8,6 +8,7 @@ obj-y += clk-a20-gmac.o
 obj-y += clk-mod0.o
 obj-y += clk-sun8i-mbus.o
 obj-y += clk-sun9i-core.o
+obj-y += clk-sun9i-mmc.o
 
 obj-$(CONFIG_MFD_SUN6I_PRCM) += \
        clk-sun6i-ar100.o clk-sun6i-apb0.o clk-sun6i-apb0-gates.o \

diff --git a/drivers/clk/sunxi/clk-sun9i-mmc.c b/drivers/clk/sunxi/clk-sun9i-mmc.c
new file mode 100644 (file)
index 0000000..710c273
--- /dev/null
+++ b/drivers/clk/sunxi/clk-sun9i-mmc.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright 2015 Chen-Yu Tsai
+ *
+ * Chen-Yu Tsai        <wens@csie.org>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <linux/spinlock.h>
+
+#define SUN9I_MMC_WIDTH                4
+
+#define SUN9I_MMC_GATE_BIT     16
+#define SUN9I_MMC_RESET_BIT    18
+
+struct sun9i_mmc_clk_data {
+       spinlock_t                      lock;
+       void __iomem                    *membase;
+       struct clk                      *clk;
+       struct reset_control            *reset;
+       struct clk_onecell_data         clk_data;
+       struct reset_controller_dev     rcdev;
+};
+
+static int sun9i_mmc_reset_assert(struct reset_controller_dev *rcdev,
+                             unsigned long id)
+{
+       struct sun9i_mmc_clk_data *data = container_of(rcdev,
+                                                      struct sun9i_mmc_clk_data,
+                                                      rcdev);
+       unsigned long flags;
+       void __iomem *reg = data->membase + SUN9I_MMC_WIDTH * id;
+       u32 val;
+
+       clk_prepare_enable(data->clk);
+       spin_lock_irqsave(&data->lock, flags);
+
+       val = readl(reg);
+       writel(val & ~BIT(SUN9I_MMC_RESET_BIT), reg);
+
+       spin_unlock_irqrestore(&data->lock, flags);
+       clk_disable_unprepare(data->clk);
+
+       return 0;
+}
+
+static int sun9i_mmc_reset_deassert(struct reset_controller_dev *rcdev,
+                               unsigned long id)
+{
+       struct sun9i_mmc_clk_data *data = container_of(rcdev,
+                                                      struct sun9i_mmc_clk_data,
+                                                      rcdev);
+       unsigned long flags;
+       void __iomem *reg = data->membase + SUN9I_MMC_WIDTH * id;
+       u32 val;
+
+       clk_prepare_enable(data->clk);
+       spin_lock_irqsave(&data->lock, flags);
+
+       val = readl(reg);
+       writel(val | BIT(SUN9I_MMC_RESET_BIT), reg);
+
+       spin_unlock_irqrestore(&data->lock, flags);
+       clk_disable_unprepare(data->clk);
+
+       return 0;
+}
+
+static struct reset_control_ops sun9i_mmc_reset_ops = {
+       .assert         = sun9i_mmc_reset_assert,
+       .deassert       = sun9i_mmc_reset_deassert,
+};
+
+static int sun9i_a80_mmc_config_clk_probe(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       struct sun9i_mmc_clk_data *data;
+       struct clk_onecell_data *clk_data;
+       const char *clk_name = np->name;
+       const char *clk_parent;
+       struct resource *r;
+       int count, i, ret;
+
+       data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       spin_lock_init(&data->lock);
+
+       r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       /* one clock/reset pair per word */
+       count = DIV_ROUND_UP((r->end - r->start + 1), SUN9I_MMC_WIDTH);
+       data->membase = devm_ioremap_resource(&pdev->dev, r);
+       if (IS_ERR(data->membase))
+               return PTR_ERR(data->membase);
+
+       clk_data = &data->clk_data;
+       clk_data->clk_num = count;
+       clk_data->clks = devm_kcalloc(&pdev->dev, count, sizeof(struct clk *),
+                                     GFP_KERNEL);
+       if (!clk_data->clks)
+               return -ENOMEM;
+
+       data->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(data->clk)) {
+               dev_err(&pdev->dev, "Could not get clock\n");
+               return PTR_ERR(data->clk);
+       }
+
+       data->reset = devm_reset_control_get(&pdev->dev, NULL);
+       if (IS_ERR(data->reset)) {
+               dev_err(&pdev->dev, "Could not get reset control\n");
+               return PTR_ERR(data->reset);
+       }
+
+       ret = reset_control_deassert(data->reset);
+       if (ret) {
+               dev_err(&pdev->dev, "Reset deassert err %d\n", ret);
+               return ret;
+       }
+
+       clk_parent = __clk_get_name(data->clk);
+       for (i = 0; i < count; i++) {
+               of_property_read_string_index(np, "clock-output-names",
+                                             i, &clk_name);
+
+               clk_data->clks[i] = clk_register_gate(&pdev->dev, clk_name,
+                                                     clk_parent, 0,
+                                                     data->membase + SUN9I_MMC_WIDTH * i,
+                                                     SUN9I_MMC_GATE_BIT, 0,
+                                                     &data->lock);
+
+               if (IS_ERR(clk_data->clks[i])) {
+                       ret = PTR_ERR(clk_data->clks[i]);
+                       goto err_clk_register;
+               }
+       }
+
+       ret = of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
+       if (ret)
+               goto err_clk_provider;
+
+       data->rcdev.owner = THIS_MODULE;
+       data->rcdev.nr_resets = count;
+       data->rcdev.ops = &sun9i_mmc_reset_ops;
+       data->rcdev.of_node = pdev->dev.of_node;
+
+       ret = reset_controller_register(&data->rcdev);
+       if (ret)
+               goto err_rc_reg;
+
+       platform_set_drvdata(pdev, data);
+
+       return 0;
+
+err_rc_reg:
+       of_clk_del_provider(np);
+
+err_clk_provider:
+       for (i = 0; i < count; i++)
+               clk_unregister(clk_data->clks[i]);
+
+err_clk_register:
+       reset_control_assert(data->reset);
+
+       return ret;
+}
+
+static int sun9i_a80_mmc_config_clk_remove(struct platform_device *pdev)
+{
+       struct device_node *np = pdev->dev.of_node;
+       struct sun9i_mmc_clk_data *data = platform_get_drvdata(pdev);
+       struct clk_onecell_data *clk_data = &data->clk_data;
+       int i;
+
+       reset_controller_unregister(&data->rcdev);
+       of_clk_del_provider(np);
+       for (i = 0; i < clk_data->clk_num; i++)
+               clk_unregister(clk_data->clks[i]);
+
+       reset_control_assert(data->reset);
+
+       return 0;
+}
+
+static const struct of_device_id sun9i_a80_mmc_config_clk_dt_ids[] = {
+       { .compatible = "allwinner,sun9i-a80-mmc-config-clk" },
+       { /* sentinel */ }
+};
+
+static struct platform_driver sun9i_a80_mmc_config_clk_driver = {
+       .driver = {
+               .name = "sun9i-a80-mmc-config-clk",
+               .of_match_table = sun9i_a80_mmc_config_clk_dt_ids,
+       },
+       .probe = sun9i_a80_mmc_config_clk_probe,
+       .remove = sun9i_a80_mmc_config_clk_remove,
+};
+module_platform_driver(sun9i_a80_mmc_config_clk_driver);
+
+MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
+MODULE_DESCRIPTION("Allwinner A80 MMC clock/reset Driver");
+MODULE_LICENSE("GPL v2");