b9a801dfa5
Add an MFD driver for Intel Merrifield Basin Cove PMIC. Firmware on the platforms which are using Basin Cove PMIC is "smarter" than on the rest supported by vanilla kernel. It handles first level of interrupt itself, while others do it on OS level. The driver is done in the same way as the rest of Intel PMIC MFD drivers in the kernel to support the initial design. The design allows to use one driver among few PMICs without knowing implementation details of the each hardware version or generation. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device access for Basin Cove PMIC
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*
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* Copyright (c) 2019, Intel Corporation.
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/intel_soc_pmic.h>
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#include <linux/mfd/intel_soc_pmic_mrfld.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <asm/intel_scu_ipc.h>
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/*
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* Level 2 IRQs
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*
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* Firmware on the systems with Basin Cove PMIC services Level 1 IRQs
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* without an assistance. Thus, each of the Level 1 IRQ is represented
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* as a separate RTE in IOAPIC.
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*/
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static struct resource irq_level2_resources[] = {
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DEFINE_RES_IRQ(0), /* power button */
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DEFINE_RES_IRQ(0), /* TMU */
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DEFINE_RES_IRQ(0), /* thermal */
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DEFINE_RES_IRQ(0), /* BCU */
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DEFINE_RES_IRQ(0), /* ADC */
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DEFINE_RES_IRQ(0), /* charger */
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DEFINE_RES_IRQ(0), /* GPIO */
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};
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static const struct mfd_cell bcove_dev[] = {
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{
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.name = "mrfld_bcove_pwrbtn",
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.num_resources = 1,
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.resources = &irq_level2_resources[0],
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}, {
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.name = "mrfld_bcove_tmu",
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.num_resources = 1,
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.resources = &irq_level2_resources[1],
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}, {
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.name = "mrfld_bcove_thermal",
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.num_resources = 1,
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.resources = &irq_level2_resources[2],
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}, {
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.name = "mrfld_bcove_bcu",
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.num_resources = 1,
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.resources = &irq_level2_resources[3],
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}, {
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.name = "mrfld_bcove_adc",
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.num_resources = 1,
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.resources = &irq_level2_resources[4],
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}, {
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.name = "mrfld_bcove_charger",
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.num_resources = 1,
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.resources = &irq_level2_resources[5],
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}, {
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.name = "mrfld_bcove_pwrsrc",
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.num_resources = 1,
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.resources = &irq_level2_resources[5],
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}, {
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.name = "mrfld_bcove_gpio",
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.num_resources = 1,
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.resources = &irq_level2_resources[6],
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},
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{ .name = "mrfld_bcove_region", },
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};
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static int bcove_ipc_byte_reg_read(void *context, unsigned int reg,
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unsigned int *val)
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{
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u8 ipc_out;
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int ret;
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ret = intel_scu_ipc_ioread8(reg, &ipc_out);
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if (ret)
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return ret;
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*val = ipc_out;
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return 0;
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}
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static int bcove_ipc_byte_reg_write(void *context, unsigned int reg,
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unsigned int val)
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{
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u8 ipc_in = val;
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int ret;
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ret = intel_scu_ipc_iowrite8(reg, ipc_in);
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if (ret)
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return ret;
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return 0;
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}
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static const struct regmap_config bcove_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = 0xff,
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.reg_write = bcove_ipc_byte_reg_write,
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.reg_read = bcove_ipc_byte_reg_read,
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};
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static int bcove_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct intel_soc_pmic *pmic;
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unsigned int i;
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int ret;
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pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
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if (!pmic)
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return -ENOMEM;
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platform_set_drvdata(pdev, pmic);
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pmic->dev = &pdev->dev;
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pmic->regmap = devm_regmap_init(dev, NULL, pmic, &bcove_regmap_config);
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if (IS_ERR(pmic->regmap))
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return PTR_ERR(pmic->regmap);
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for (i = 0; i < ARRAY_SIZE(irq_level2_resources); i++) {
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ret = platform_get_irq(pdev, i);
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if (ret < 0)
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return ret;
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irq_level2_resources[i].start = ret;
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irq_level2_resources[i].end = ret;
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}
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return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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bcove_dev, ARRAY_SIZE(bcove_dev),
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NULL, 0, NULL);
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}
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static const struct acpi_device_id bcove_acpi_ids[] = {
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{ "INTC100E" },
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{}
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};
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MODULE_DEVICE_TABLE(acpi, bcove_acpi_ids);
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static struct platform_driver bcove_driver = {
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.driver = {
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.name = "intel_soc_pmic_mrfld",
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.acpi_match_table = bcove_acpi_ids,
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},
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.probe = bcove_probe,
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};
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module_platform_driver(bcove_driver);
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MODULE_DESCRIPTION("IPC driver for Intel SoC Basin Cove PMIC");
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MODULE_LICENSE("GPL v2");
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