| /* |
| * Device driver for MTCMOS DRIVER in HI6220 SOC |
| * |
| * Copyright (c) 2011 Hisilicon Co. Ltd |
| * |
| */ |
| #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/delay.h> |
| #include <linux/time.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; |
| int mtcmos_steady_time; |
| spinlock_t mtcmos_spin_lock; |
| }; |
| |
| static int hi6220_mtcmos_is_on(struct hi6220_mtcmos *mtcmos, |
| unsigned int regs, unsigned int mask, int shift) |
| { |
| unsigned int ret; |
| unsigned long mtcmos_spin_flag = 0; |
| |
| spin_lock_irqsave(&mtcmos->mtcmos_spin_lock, mtcmos_spin_flag); |
| ret = readl(mtcmos->sc_on_regs + regs); |
| spin_unlock_irqrestore(&mtcmos->mtcmos_spin_lock, mtcmos_spin_flag); |
| |
| ret &= (mask << shift); |
| return !!ret; |
| } |
| |
| int hi6220_mtcmos_on(struct hi6220_mtcmos *mtcmos, |
| unsigned int regs, unsigned int mask, int shift) |
| { |
| unsigned long mtcmos_spin_flag = 0; |
| |
| spin_lock_irqsave(&mtcmos->mtcmos_spin_lock, mtcmos_spin_flag); |
| writel(mask << shift, mtcmos->sc_on_regs + regs); |
| udelay(mtcmos->mtcmos_steady_time); |
| spin_unlock_irqrestore(&mtcmos->mtcmos_spin_lock, mtcmos_spin_flag); |
| |
| return 0; |
| } |
| |
| int hi6220_mtcmos_off(struct hi6220_mtcmos *mtcmos, |
| unsigned int regs, unsigned int mask, int shift) |
| { |
| unsigned long mtcmos_spin_flag = 0; |
| |
| spin_lock_irqsave(&mtcmos->mtcmos_spin_lock, mtcmos_spin_flag); |
| writel(mask << shift, mtcmos->sc_on_regs + regs); |
| udelay(mtcmos->mtcmos_steady_time); |
| spin_unlock_irqrestore(&mtcmos->mtcmos_spin_lock, |
| mtcmos_spin_flag); |
| |
| return 0; |
| } |
| |
| static int hi6220_regulator_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_regulator_mtcmos_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_on(mtcmos, ctrl_regs->enable_reg, |
| ctrl_data->mask, ctrl_data->shift); |
| if (0 == hi6220_mtcmos_is_on(mtcmos, ctrl_regs->status_reg, |
| ctrl_data->mask, ctrl_data->shift)) { |
| return -1; |
| } |
| return ret; |
| } |
| |
| static int hi6220_regulator_mtcmos_disabled(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_off(mtcmos, ctrl_regs->disable_reg, |
| ctrl_data->mask, ctrl_data->shift); |
| |
| return ret; |
| } |
| |
| static struct regulator_ops hi6220_mtcmos_mtcmos_rops = { |
| .is_enabled = hi6220_regulator_mtcmos_is_enabled, |
| .enable = hi6220_regulator_mtcmos_enabled, |
| .disable = hi6220_regulator_mtcmos_disabled, |
| }; |
| |
| #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 count, i; |
| struct regulator_config config = { }; |
| struct regulator_init_data *init_data; |
| struct hi6220_mtcmos_info *sreg; |
| |
| dev = &pdev->dev; |
| np = dev->of_node; |
| mtcmos = devm_kzalloc(dev, |
| sizeof(struct hi6220_mtcmos), GFP_KERNEL); |
| if (!mtcmos) { |
| dev_err(dev, "cannot allocate hi6220_mtcmos device info\n"); |
| return -ENOMEM; |
| } |
| |
| spin_lock_init((spinlock_t *)&mtcmos->mtcmos_spin_lock); |
| 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), 0x1000); |
| mtcmos->sc_on_regs = regs; |
| } |
| ret = of_property_read_u32(np, "hisilicon,mtcmos-steady-us", |
| &mtcmos->mtcmos_steady_time); |
| |
| count = of_regulator_match(&pdev->dev, np, |
| hi6220_mtcmos_matches, |
| ARRAY_SIZE(hi6220_mtcmos_matches)); |
| |
| 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; |
| 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", |
| (unsigned int *)(&sreg->ctrl_regs), 0x3); |
| ret = of_property_read_u32_array(child, "hisilicon,ctrl-data", |
| (unsigned int *)(&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 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("Baixing Quan<quanbaixing@huawei.com>"); |
| MODULE_DESCRIPTION("HI6220 MTCMOS interface driver"); |
| MODULE_LICENSE("GPL V2"); |