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172 lines
4.2 KiB
172 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* dptf_pch_fivr: DPTF PCH FIVR Participant driver |
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* Copyright (c) 2020, Intel Corporation. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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struct pch_fivr_resp { |
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u64 status; |
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u64 result; |
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}; |
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static int pch_fivr_read(acpi_handle handle, char *method, struct pch_fivr_resp *fivr_resp) |
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{ |
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struct acpi_buffer resp = { sizeof(struct pch_fivr_resp), fivr_resp}; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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struct acpi_buffer format = { sizeof("NN"), "NN" }; |
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union acpi_object *obj; |
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acpi_status status; |
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int ret = -EFAULT; |
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status = acpi_evaluate_object(handle, method, NULL, &buffer); |
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if (ACPI_FAILURE(status)) |
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return ret; |
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obj = buffer.pointer; |
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if (!obj || obj->type != ACPI_TYPE_PACKAGE) |
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goto release_buffer; |
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status = acpi_extract_package(obj, &format, &resp); |
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if (ACPI_FAILURE(status)) |
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goto release_buffer; |
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if (fivr_resp->status) |
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goto release_buffer; |
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ret = 0; |
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release_buffer: |
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kfree(buffer.pointer); |
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return ret; |
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} |
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/* |
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* Presentation of attributes which are defined for INTC10xx |
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* They are: |
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* freq_mhz_low_clock : Set PCH FIVR switching freq for |
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* FIVR clock 19.2MHz and 24MHz |
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* freq_mhz_high_clock : Set PCH FIVR switching freq for |
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* FIVR clock 38.4MHz |
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*/ |
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#define PCH_FIVR_SHOW(name, method) \ |
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static ssize_t name##_show(struct device *dev,\ |
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struct device_attribute *attr,\ |
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char *buf)\ |
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{\ |
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struct acpi_device *acpi_dev = dev_get_drvdata(dev);\ |
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struct pch_fivr_resp fivr_resp;\ |
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int status;\ |
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\ |
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status = pch_fivr_read(acpi_dev->handle, #method, &fivr_resp);\ |
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if (status)\ |
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return status;\ |
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\ |
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return sprintf(buf, "%llu\n", fivr_resp.result);\ |
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} |
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#define PCH_FIVR_STORE(name, method) \ |
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static ssize_t name##_store(struct device *dev,\ |
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struct device_attribute *attr,\ |
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const char *buf, size_t count)\ |
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{\ |
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struct acpi_device *acpi_dev = dev_get_drvdata(dev);\ |
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acpi_status status;\ |
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u32 val;\ |
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\ |
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if (kstrtouint(buf, 0, &val) < 0)\ |
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return -EINVAL;\ |
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\ |
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status = acpi_execute_simple_method(acpi_dev->handle, #method, val);\ |
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if (ACPI_SUCCESS(status))\ |
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return count;\ |
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\ |
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return -EINVAL;\ |
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} |
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PCH_FIVR_SHOW(freq_mhz_low_clock, GFC0) |
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PCH_FIVR_SHOW(freq_mhz_high_clock, GFC1) |
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PCH_FIVR_SHOW(ssc_clock_info, GEMI) |
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PCH_FIVR_SHOW(fivr_switching_freq_mhz, GFCS) |
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PCH_FIVR_SHOW(fivr_switching_fault_status, GFFS) |
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PCH_FIVR_STORE(freq_mhz_low_clock, RFC0) |
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PCH_FIVR_STORE(freq_mhz_high_clock, RFC1) |
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static DEVICE_ATTR_RW(freq_mhz_low_clock); |
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static DEVICE_ATTR_RW(freq_mhz_high_clock); |
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static DEVICE_ATTR_RO(ssc_clock_info); |
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static DEVICE_ATTR_RO(fivr_switching_freq_mhz); |
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static DEVICE_ATTR_RO(fivr_switching_fault_status); |
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static struct attribute *fivr_attrs[] = { |
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&dev_attr_freq_mhz_low_clock.attr, |
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&dev_attr_freq_mhz_high_clock.attr, |
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&dev_attr_ssc_clock_info.attr, |
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&dev_attr_fivr_switching_freq_mhz.attr, |
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&dev_attr_fivr_switching_fault_status.attr, |
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NULL |
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}; |
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static const struct attribute_group pch_fivr_attribute_group = { |
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.attrs = fivr_attrs, |
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.name = "pch_fivr_switch_frequency" |
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}; |
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static int pch_fivr_add(struct platform_device *pdev) |
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{ |
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struct acpi_device *acpi_dev; |
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unsigned long long ptype; |
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acpi_status status; |
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int result; |
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acpi_dev = ACPI_COMPANION(&(pdev->dev)); |
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if (!acpi_dev) |
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return -ENODEV; |
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status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype); |
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if (ACPI_FAILURE(status) || ptype != 0x05) |
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return -ENODEV; |
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result = sysfs_create_group(&pdev->dev.kobj, |
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&pch_fivr_attribute_group); |
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if (result) |
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return result; |
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platform_set_drvdata(pdev, acpi_dev); |
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return 0; |
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} |
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static int pch_fivr_remove(struct platform_device *pdev) |
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{ |
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sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group); |
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return 0; |
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} |
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static const struct acpi_device_id pch_fivr_device_ids[] = { |
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{"INTC1045", 0}, |
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{"INTC1049", 0}, |
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{"INTC10A3", 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids); |
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static struct platform_driver pch_fivr_driver = { |
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.probe = pch_fivr_add, |
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.remove = pch_fivr_remove, |
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.driver = { |
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.name = "dptf_pch_fivr", |
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.acpi_match_table = pch_fivr_device_ids, |
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}, |
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}; |
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module_platform_driver(pch_fivr_driver); |
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MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("ACPI DPTF PCH FIVR driver");
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