diff options
Diffstat (limited to 'arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c')
| -rw-r--r-- | arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c | 150 |
1 files changed, 116 insertions, 34 deletions
diff --git a/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c b/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c index 44438f344dc8..8e50daa99151 100644 --- a/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c +++ b/arch/arm/mach-shmobile/regulator-quirk-rcar-gen2.c @@ -1,9 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * R-Car Generation 2 da9063/da9210 regulator quirk * - * The r8a7790/lager and r8a7791/koelsch development boards have da9063 and - * da9210 regulators. Both regulators have their interrupt request lines tied - * to the same interrupt pin (IRQ2) on the SoC. + * Certain Gen2 development boards have an da9063 and one or more da9210 + * regulators. All of these regulators have their interrupt request lines + * tied to the same interrupt pin (IRQ2) on the SoC. * * After cold boot or da9063-induced restart, both the da9063 and da9210 seem * to assert their interrupt request lines. Hence as soon as one driver @@ -16,26 +17,18 @@ * been initialized, but before the i2c slave drivers are initialized. * * Copyright (C) 2015 Glider bvba - * - * 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. - * - * 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/device.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/io.h> +#include <linux/list.h> #include <linux/notifier.h> #include <linux/of.h> +#include <linux/of_irq.h> #include <linux/mfd/da9063/registers.h> - #define IRQC_BASE 0xe61c0000 #define IRQC_MONITOR 0x104 /* IRQn Signal Level Monitor Register */ @@ -44,30 +37,45 @@ /* start of DA9210 System Control and Event Registers */ #define DA9210_REG_MASK_A 0x54 +struct regulator_quirk { + struct list_head list; + const struct of_device_id *id; + struct of_phandle_args irq_args; + struct i2c_msg i2c_msg; + bool shared; /* IRQ line is shared */ +}; + +static LIST_HEAD(quirk_list); static void __iomem *irqc; /* first byte sets the memory pointer, following are consecutive reg values */ static u8 da9063_irq_clr[] = { DA9063_REG_IRQ_MASK_A, 0xff, 0xff, 0xff, 0xff }; static u8 da9210_irq_clr[] = { DA9210_REG_MASK_A, 0xff, 0xff }; -static struct i2c_msg da9xxx_msgs[2] = { - { - .addr = 0x58, - .len = ARRAY_SIZE(da9063_irq_clr), - .buf = da9063_irq_clr, - }, { - .addr = 0x68, - .len = ARRAY_SIZE(da9210_irq_clr), - .buf = da9210_irq_clr, - }, +static struct i2c_msg da9063_msg = { + .len = ARRAY_SIZE(da9063_irq_clr), + .buf = da9063_irq_clr, +}; + +static struct i2c_msg da9210_msg = { + .len = ARRAY_SIZE(da9210_irq_clr), + .buf = da9210_irq_clr, +}; + +static const struct of_device_id rcar_gen2_quirk_match[] = { + { .compatible = "dlg,da9063", .data = &da9063_msg }, + { .compatible = "dlg,da9210", .data = &da9210_msg }, + {}, }; static int regulator_quirk_notify(struct notifier_block *nb, unsigned long action, void *data) { + struct regulator_quirk *pos, *tmp; struct device *dev = data; struct i2c_client *client; static bool done; + int ret; u32 mon; if (done) @@ -84,13 +92,20 @@ static int regulator_quirk_notify(struct notifier_block *nb, client = to_i2c_client(dev); dev_dbg(dev, "Detected %s\n", client->name); - if ((client->addr == 0x58 && !strcmp(client->name, "da9063")) || - (client->addr == 0x68 && !strcmp(client->name, "da9210"))) { - int ret; + /* + * Send message to all PMICs that share an IRQ line to deassert it. + * + * WARNING: This works only if all the PMICs are on the same I2C bus. + */ + list_for_each_entry(pos, &quirk_list, list) { + if (!pos->shared) + continue; + + dev_info(&client->dev, "clearing %s@0x%02x interrupts\n", + pos->id->compatible, pos->i2c_msg.addr); - dev_info(&client->dev, "clearing da9063/da9210 interrupts\n"); - ret = i2c_transfer(client->adapter, da9xxx_msgs, ARRAY_SIZE(da9xxx_msgs)); - if (ret != ARRAY_SIZE(da9xxx_msgs)) + ret = i2c_transfer(client->adapter, &pos->i2c_msg, 1); + if (ret != 1) dev_err(&client->dev, "i2c error %d\n", ret); } @@ -103,6 +118,11 @@ static int regulator_quirk_notify(struct notifier_block *nb, remove: dev_info(dev, "IRQ2 is not asserted, removing quirk\n"); + list_for_each_entry_safe(pos, tmp, &quirk_list, list) { + list_del(&pos->list); + kfree(pos); + } + done = true; iounmap(irqc); return 0; @@ -114,29 +134,91 @@ static struct notifier_block regulator_quirk_nb = { static int __init rcar_gen2_regulator_quirk(void) { - u32 mon; + struct regulator_quirk *quirk, *pos, *tmp; + struct of_phandle_args *argsa, *argsb; + const struct of_device_id *id; + struct device_node *np; + u32 mon, addr; + int ret; if (!of_machine_is_compatible("renesas,koelsch") && !of_machine_is_compatible("renesas,lager") && + !of_machine_is_compatible("renesas,stout") && !of_machine_is_compatible("renesas,gose")) return -ENODEV; + for_each_matching_node_and_match(np, rcar_gen2_quirk_match, &id) { + if (!of_device_is_available(np)) + break; + + ret = of_property_read_u32(np, "reg", &addr); + if (ret) /* Skip invalid entry and continue */ + continue; + + quirk = kzalloc(sizeof(*quirk), GFP_KERNEL); + if (!quirk) { + ret = -ENOMEM; + goto err_mem; + } + + argsa = &quirk->irq_args; + memcpy(&quirk->i2c_msg, id->data, sizeof(quirk->i2c_msg)); + + quirk->id = id; + quirk->i2c_msg.addr = addr; + + ret = of_irq_parse_one(np, 0, argsa); + if (ret) { /* Skip invalid entry and continue */ + kfree(quirk); + continue; + } + + list_for_each_entry(pos, &quirk_list, list) { + argsb = &pos->irq_args; + + if (argsa->args_count != argsb->args_count) + continue; + + ret = memcmp(argsa->args, argsb->args, + argsa->args_count * + sizeof(argsa->args[0])); + if (!ret) { + pos->shared = true; + quirk->shared = true; + } + } + + list_add_tail(&quirk->list, &quirk_list); + } + irqc = ioremap(IRQC_BASE, PAGE_SIZE); - if (!irqc) - return -ENOMEM; + if (!irqc) { + ret = -ENOMEM; + goto err_mem; + } mon = ioread32(irqc + IRQC_MONITOR); if (mon & REGULATOR_IRQ_MASK) { pr_debug("%s: IRQ2 is not asserted, not installing quirk\n", __func__); - iounmap(irqc); - return 0; + ret = 0; + goto err_free; } pr_info("IRQ2 is asserted, installing da9063/da9210 regulator quirk\n"); bus_register_notifier(&i2c_bus_type, ®ulator_quirk_nb); return 0; + +err_free: + iounmap(irqc); +err_mem: + list_for_each_entry_safe(pos, tmp, &quirk_list, list) { + list_del(&pos->list); + kfree(pos); + } + + return ret; } arch_initcall(rcar_gen2_regulator_quirk); |