[PATCH 5/7] regulator: add driver for mtcmos voltage regulator on hi6220 SoC

Chen Feng
2015-11-05T13:49:03Z

Add driver to support mtcmos on hi6220

Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: Fei Wang <w.f@huawei.com>
---
drivers/regulator/hi6220-mtcmos.c | 245 ++++++++++++++++++++++++++++++++++++++
1 file changed, 245 insertions(+)
create mode 100644 drivers/regulator/hi6220-mtcmos.c

diff --git a/drivers/regulator/hi6220-mtcmos.c b/drivers/regulator/hi6220-mtcmos.c
new file mode 100644
index 0000000..c79ffc0
--- /dev/null
+++ b/drivers/regulator/hi6220-mtcmos.c
@@ -0,0 +1,245 @@
+/*
+ * Device driver for regulators in hi6220 mtcmos
+ *
+ * Copyright (c) 2015 Hisilicon.
+ *
+ * Fei Wang <w.f@huawei.com>
+ * Chen Feng <puck.chen@hisilicon.com>
+ *
+ * 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/slab.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/sizes.h>
+
+enum {
+ HI6220_MTCMOS1,
+ HI6220_MTCMOS2,
+ HI6220_RG_MAX,
+};
+
+struct hi6220_mtcmos_ctrl_regs {
+ unsigned int enable_reg;
+ unsigned int disable_reg;
+ unsigned int status_reg;
+};
+
+struct hi6220_mtcmos_ctrl_data {
+ int shift;
+ unsigned int mask;
+};
+
+struct hi6220_mtcmos_info {
+ struct regulator_desc rdesc;
+ struct hi6220_mtcmos_ctrl_regs ctrl_regs;
+ struct hi6220_mtcmos_ctrl_data ctrl_data;
+};
+
+struct hi6220_mtcmos {
+ struct regulator_dev *rdev[HI6220_RG_MAX];
+ void __iomem *sc_on_regs;
+};
+
+static int hi6220_mtcmos_is_on(struct hi6220_mtcmos *mtcmos,
+ unsigned int regs, unsigned int mask, int shift)
+{
+ unsigned int ret;
+
+ ret = readl(mtcmos->sc_on_regs + regs);
+ ret &= (mask << shift);
+
+ return ret;
+}
+
+static int hi6220_mtcmos_is_enabled(struct regulator_dev *rdev)
+{
+ int ret;
+ struct hi6220_mtcmos_info *sreg = rdev_get_drvdata(rdev);
+ struct platform_device *pdev =
+ container_of(rdev->dev.parent, struct platform_device, dev);
+ struct hi6220_mtcmos *mtcmos = platform_get_drvdata(pdev);
+ struct hi6220_mtcmos_ctrl_regs *ctrl_regs = &sreg->ctrl_regs;
+ struct hi6220_mtcmos_ctrl_data *ctrl_data = &sreg->ctrl_data;
+
+ ret = hi6220_mtcmos_is_on(mtcmos, ctrl_regs->status_reg,
+ ctrl_data->mask, ctrl_data->shift);
+ return ret;
+}
+
+static int hi6220_mtcmos_op(struct hi6220_mtcmos *mtcmos,
+ unsigned int regs, unsigned int mask, int shift)
+{
+ writel(mask << shift, mtcmos->sc_on_regs + regs);
+
+ return 0;
+}
+
+static int hi6220_mtcmos_enable(struct regulator_dev *rdev)
+{
+ int ret;
+ struct hi6220_mtcmos_info *sreg = rdev_get_drvdata(rdev);
+ struct platform_device *pdev =
+ container_of(rdev->dev.parent, struct platform_device, dev);
+ struct hi6220_mtcmos *mtcmos = platform_get_drvdata(pdev);
+ struct hi6220_mtcmos_ctrl_regs *ctrl_regs = &sreg->ctrl_regs;
+ struct hi6220_mtcmos_ctrl_data *ctrl_data = &sreg->ctrl_data;
+
+ hi6220_mtcmos_op(mtcmos, ctrl_regs->enable_reg,
+ ctrl_data->mask, ctrl_data->shift);
+ ret = hi6220_mtcmos_is_on(mtcmos, ctrl_regs->status_reg,
+ ctrl_data->mask, ctrl_data->shift)
+ return ret;
+}
+
+static int hi6220_mtcmos_disable(struct regulator_dev *rdev)
+{
+ int ret;
+ struct hi6220_mtcmos_info *sreg = rdev_get_drvdata(rdev);
+ struct platform_device *pdev =
+ container_of(rdev->dev.parent, struct platform_device, dev);
+ struct hi6220_mtcmos *mtcmos = platform_get_drvdata(pdev);
+ struct hi6220_mtcmos_ctrl_regs *ctrl_regs = &sreg->ctrl_regs;
+ struct hi6220_mtcmos_ctrl_data *ctrl_data = &sreg->ctrl_data;
+
+ ret = hi6220_mtcmos_op(mtcmos, ctrl_regs->disable_reg,
+ ctrl_data->mask, ctrl_data->shift);
+
+ return ret;
+}
+
+static struct regulator_ops hi6220_mtcmos_mtcmos_rops = {
+ .is_enabled = hi6220_mtcmos_is_enabled,
+ .enable = hi6220_mtcmos_enable,
+ .disable = hi6220_mtcmos_disable,
+};
+
+#define HI6220_MTCMOS(vreg) \
+{ \
+ .rdesc = { \
+ .name = #vreg, \
+ .ops = &hi6220_mtcmos_mtcmos_rops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+}
+
+static struct hi6220_mtcmos_info hi6220_mtcmos_info[] = {
+ HI6220_MTCMOS(MTCMOS1),
+ HI6220_MTCMOS(MTCMOS2),
+};
+
+static struct of_regulator_match hi6220_mtcmos_matches[] = {
+ { .name = "mtcmos1",
+ .driver_data = &hi6220_mtcmos_info[HI6220_MTCMOS1], },
+ { .name = "mtcmos2",
+ .driver_data = &hi6220_mtcmos_info[HI6220_MTCMOS2], },
+};
+
+static int hi6220_mtcmos_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct hi6220_mtcmos *mtcmos;
+ const __be32 *sc_on_regs = NULL;
+ void __iomem *regs;
+ struct device *dev;
+ struct device_node *np, *child;
+ int i;
+ struct regulator_config config = { };
+ struct regulator_init_data *init_data;
+ struct hi6220_mtcmos_info *sreg;
+ u32 off_on_delay = 0;
+
+ dev = &pdev->dev;
+ np = dev->of_node;
+ mtcmos = devm_kzalloc(dev, sizeof(struct hi6220_mtcmos), GFP_KERNEL);
+ if (!mtcmos)
+ return -ENOMEM;
+
+ sc_on_regs = of_get_property(np, "hisilicon,mtcmos-sc-on-base", NULL);
+ if (sc_on_regs) {
+ regs = ioremap(be32_to_cpu(*sc_on_regs), SZ_4K);
+ mtcmos->sc_on_regs = regs;
+ } else
+ return -ENODEV;
+ of_property_read_u32(np, "hisilicon,mtcmos-steady-us", &off_on_delay);
+
+ for (i = 0; i < HI6220_RG_MAX; i++) {
+ init_data = hi6220_mtcmos_matches[i].init_data;
+ if (!init_data)
+ continue;
+ sreg = hi6220_mtcmos_matches[i].driver_data;
+ sreg->rdesc.off_on_delay = off_on_delay;
+ config.dev = &pdev->dev;
+ config.init_data = init_data;
+ config.driver_data = sreg;
+ config.of_node = hi6220_mtcmos_matches[i].of_node;
+ child = config.of_node;
+
+ ret = of_property_read_u32_array(child, "hisilicon,ctrl-regs",
+ (u32 *)(&sreg->ctrl_regs),
+ 0x3);
+ ret = of_property_read_u32_array(child, "hisilicon,ctrl-data",
+ (u32 *)(&sreg->ctrl_data),
+ 0x2);
+
+ mtcmos->rdev[i] = regulator_register(&sreg->rdesc, &config);
+ if (IS_ERR(mtcmos->rdev[i])) {
+ ret = PTR_ERR(mtcmos->rdev[i]);
+ dev_err(&pdev->dev, "failed to register mtcmos %s\n",
+ sreg->rdesc.name);
+ while (--i >= 0)
+ regulator_unregister(mtcmos->rdev[i]);
+
+ return ret;
+ }
+ }
+
+ platform_set_drvdata(pdev, mtcmos);
+
+ return 0;
+}
+
+static const struct of_device_id of_hi6220_mtcmos_match_tbl[] = {
+ { .compatible = "hisilicon,hi6220-mtcmos-driver", },
+ {}
+};
+
+static struct platform_driver mtcmos_driver = {
+ .driver = {
+ .name = "hisi_hi6220_mtcmos",
+ .owner = THIS_MODULE,
+ .of_match_table = of_hi6220_mtcmos_match_tbl,
+ },
+ .probe = hi6220_mtcmos_probe,
+};
+
+static int __init hi6220_mtcmos_init(void)
+{
+ return platform_driver_register(&mtcmos_driver);
+}
+
+static void __exit hi6220_mtcmos_exit(void)
+{
+ platform_driver_unregister(&mtcmos_driver);
+}
+
+fs_initcall(hi6220_mtcmos_init);
+module_exit(hi6220_mtcmos_exit);
+
+MODULE_AUTHOR("Fei Wang <w.f@huawei.com>");
+MODULE_DESCRIPTION("Hi6220 mtcmos interface driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1