^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * dcdbas.c: Dell Systems Management Base Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * The Dell Systems Management Base Driver provides a sysfs interface for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * systems management software to perform System Management Interrupts (SMIs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * and Host Control Actions (power cycle or power off after OS shutdown) on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Dell systems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * See Documentation/driver-api/dcdbas.rst for more information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Copyright (C) 1995-2006 Dell Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/dma-mapping.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/mc146818rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include "dcdbas.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define DRIVER_NAME "dcdbas"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define DRIVER_VERSION "5.6.0-3.4"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static struct platform_device *dcdbas_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static u8 *smi_data_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static dma_addr_t smi_data_buf_handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static unsigned long smi_data_buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static unsigned long max_smi_data_buf_size = MAX_SMI_DATA_BUF_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static u32 smi_data_buf_phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static DEFINE_MUTEX(smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static u8 *bios_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static unsigned int host_control_action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static unsigned int host_control_smi_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static unsigned int host_control_on_shutdown;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static bool wsmt_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * smi_data_buf_free: free SMI data buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static void smi_data_buf_free(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (!smi_data_buf || wsmt_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) __func__, smi_data_buf_phys_addr, smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) smi_data_buf_handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) smi_data_buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) smi_data_buf_handle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) smi_data_buf_phys_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) smi_data_buf_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * smi_data_buf_realloc: grow SMI data buffer if needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static int smi_data_buf_realloc(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) void *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) dma_addr_t handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (smi_data_buf_size >= size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (size > max_smi_data_buf_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* new buffer is needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) dev_dbg(&dcdbas_pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) "%s: failed to allocate memory size %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) __func__, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* memory zeroed by dma_alloc_coherent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (smi_data_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) memcpy(buf, smi_data_buf, smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* free any existing buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) smi_data_buf_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* set up new buffer for use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) smi_data_buf = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) smi_data_buf_handle = handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) smi_data_buf_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) __func__, smi_data_buf_phys_addr, smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static ssize_t smi_data_buf_size_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return sprintf(buf, "%lu\n", smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static ssize_t smi_data_buf_size_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) buf_size = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* make sure SMI data buffer is at least buf_size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) mutex_lock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ret = smi_data_buf_realloc(buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) mutex_unlock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static ssize_t smi_data_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) char *buf, loff_t pos, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) mutex_lock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) mutex_unlock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static ssize_t smi_data_write(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct bin_attribute *bin_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) char *buf, loff_t pos, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if ((pos + count) > max_smi_data_buf_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) mutex_lock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) ret = smi_data_buf_realloc(pos + count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) memcpy(smi_data_buf + pos, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) mutex_unlock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static ssize_t host_control_action_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return sprintf(buf, "%u\n", host_control_action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static ssize_t host_control_action_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* make sure buffer is available for host control command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) mutex_lock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) mutex_unlock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) host_control_action = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static ssize_t host_control_smi_type_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return sprintf(buf, "%u\n", host_control_smi_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static ssize_t host_control_smi_type_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) host_control_smi_type = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static ssize_t host_control_on_shutdown_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return sprintf(buf, "%u\n", host_control_on_shutdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static ssize_t host_control_on_shutdown_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static int raise_smi(void *par)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct smi_cmd *smi_cmd = par;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (smp_processor_id() != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* generate SMI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /* inb to force posted write through and make SMI happen now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) asm volatile (
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) "outb %b0,%w1\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) "inb %w1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) : /* no output args */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) : "a" (smi_cmd->command_code),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) "d" (smi_cmd->command_address),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) "b" (smi_cmd->ebx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) "c" (smi_cmd->ecx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) : "memory"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * dcdbas_smi_request: generate SMI request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * Called with smi_data_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int dcdbas_smi_request(struct smi_cmd *smi_cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (smi_cmd->magic != SMI_CMD_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return -EBADR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* SMI requires CPU 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) get_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) ret = smp_call_on_cpu(0, raise_smi, smi_cmd, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) put_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * smi_request_store:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * The valid values are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * 0: zero SMI data buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * 1: generate calling interface SMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * 2: generate raw SMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * User application writes smi_cmd to smi_data before telling driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * to generate SMI.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static ssize_t smi_request_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) struct smi_cmd *smi_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) unsigned long val = simple_strtoul(buf, NULL, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) mutex_lock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (smi_data_buf_size < sizeof(struct smi_cmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) smi_cmd = (struct smi_cmd *)smi_data_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) switch (val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* Raw SMI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ret = dcdbas_smi_request(smi_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * Calling Interface SMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Provide physical address of command buffer field within
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * the struct smi_cmd to BIOS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * Because the address that smi_cmd (smi_data_buf) points to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * will be from memremap() of a non-memory address if WSMT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * is present, we can't use virt_to_phys() on smi_cmd, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * we have to use the physical address that was saved when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * the virtual address for smi_cmd was received.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) smi_cmd->ebx = smi_data_buf_phys_addr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) offsetof(struct smi_cmd, command_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ret = dcdbas_smi_request(smi_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) memset(smi_data_buf, 0, smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) mutex_unlock(&smi_data_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) EXPORT_SYMBOL(dcdbas_smi_request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * host_control_smi: generate host control SMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * Caller must set up the host control command in smi_data_buf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static int host_control_smi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct apm_cmd *apm_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) u8 *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) u32 num_ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) s8 cmd_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) u8 index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) apm_cmd = (struct apm_cmd *)smi_data_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) switch (host_control_smi_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) case HC_SMITYPE_TYPE1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) spin_lock_irqsave(&rtc_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) /* write SMI data buffer physical address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) data = (u8 *)&smi_data_buf_phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) for (index = PE1300_CMOS_CMD_STRUCT_PTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) index++, data++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) outb(index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) (CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) outb(*data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) (CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* first set status to -1 as called by spec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) /* generate SMM call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) spin_unlock_irqrestore(&rtc_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) /* wait a few to see if it executed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) == ESM_STATUS_CMD_UNSUCCESSFUL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) num_ticks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (num_ticks == EXPIRED_TIMER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) case HC_SMITYPE_TYPE2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) case HC_SMITYPE_TYPE3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) spin_lock_irqsave(&rtc_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) /* write SMI data buffer physical address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) data = (u8 *)&smi_data_buf_phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) for (index = PE1400_CMOS_CMD_STRUCT_PTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) index++, data++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /* generate SMM call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) if (host_control_smi_type == HC_SMITYPE_TYPE3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /* restore RTC index pointer since it was written to above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) CMOS_READ(RTC_REG_C);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) spin_unlock_irqrestore(&rtc_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) /* read control port back to serialize write */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) cmd_status = inb(PE1400_APM_CONTROL_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) /* wait a few to see if it executed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) num_ticks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (num_ticks == EXPIRED_TIMER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) __func__, host_control_smi_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * dcdbas_host_control: initiate host control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * This function is called by the driver after the system has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * finished shutting down if the user application specified a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * host control action to perform on shutdown. It is safe to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * use smi_data_buf at this point because the system has finished
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * shutting down and no userspace apps are running.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static void dcdbas_host_control(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct apm_cmd *apm_cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) u8 action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (host_control_action == HC_ACTION_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) action = host_control_action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) host_control_action = HC_ACTION_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (!smi_data_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (smi_data_buf_size < sizeof(struct apm_cmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) apm_cmd = (struct apm_cmd *)smi_data_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* power off takes precedence */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) apm_cmd->command = ESM_APM_POWER_CYCLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) apm_cmd->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) host_control_smi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) } else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) apm_cmd->command = ESM_APM_POWER_CYCLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) apm_cmd->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) *((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) host_control_smi();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /* WSMT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) static u8 checksum(u8 *buffer, u8 length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) u8 sum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) u8 *end = buffer + length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) while (buffer < end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) sum += *buffer++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static inline struct smm_eps_table *check_eps_table(u8 *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct smm_eps_table *eps = (struct smm_eps_table *)addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (strncmp(eps->smm_comm_buff_anchor, SMM_EPS_SIG, 4) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (checksum(addr, eps->length) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) return eps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) static int dcdbas_check_wsmt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) const struct dmi_device *dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) struct acpi_table_wsmt *wsmt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) struct smm_eps_table *eps = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) u64 bios_buf_paddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) u64 remap_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) u8 *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) acpi_get_table(ACPI_SIG_WSMT, 0, (struct acpi_table_header **)&wsmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (!wsmt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) /* Check if WSMT ACPI table shows that protection is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) !(wsmt->protection_flags & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * BIOS could provide the address/size of the protected buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * in an SMBIOS string or in an EPS structure in 0xFxxxx.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /* Check SMBIOS for buffer address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (sscanf(dev->name, "30[%16llx;%8llx]", &bios_buf_paddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) &remap_size) == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) goto remap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* Scan for EPS (entry point structure) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) for (addr = (u8 *)__va(0xf0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) addr += 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) eps = check_eps_table(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (eps)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) if (!eps) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) dev_dbg(&dcdbas_pdev->dev, "found WSMT, but no firmware buffer found\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) bios_buf_paddr = eps->smm_comm_buff_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) remap_size = eps->num_of_4k_pages * PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) remap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * Get physical address of buffer and map to virtual address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * Table gives size in 4K pages, regardless of actual system page size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (upper_32_bits(bios_buf_paddr + 8)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) dev_warn(&dcdbas_pdev->dev, "found WSMT, but buffer address is above 4GB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) * Limit remap size to MAX_SMI_DATA_BUF_SIZE + 8 (since the first 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) * bytes are used for a semaphore, not the data buffer itself).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) if (remap_size > MAX_SMI_DATA_BUF_SIZE + 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) remap_size = MAX_SMI_DATA_BUF_SIZE + 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) bios_buffer = memremap(bios_buf_paddr, remap_size, MEMREMAP_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (!bios_buffer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map buffer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /* First 8 bytes is for a semaphore, not part of the smi_data_buf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) smi_data_buf_phys_addr = bios_buf_paddr + 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) smi_data_buf = bios_buffer + 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) smi_data_buf_size = remap_size - 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) max_smi_data_buf_size = smi_data_buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) wsmt_enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) dev_info(&dcdbas_pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) "WSMT found, using firmware-provided SMI buffer.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) * dcdbas_reboot_notify: handle reboot notification for host control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) switch (code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) case SYS_DOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) case SYS_HALT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) case SYS_POWER_OFF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) if (host_control_on_shutdown) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* firmware is going to perform host control action */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) printk(KERN_WARNING "Please wait for shutdown "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) "action to complete...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) dcdbas_host_control();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) static struct notifier_block dcdbas_reboot_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) .notifier_call = dcdbas_reboot_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) .next = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) .priority = INT_MIN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) static DCDBAS_BIN_ATTR_RW(smi_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) static struct bin_attribute *dcdbas_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) &bin_attr_smi_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) static DCDBAS_DEV_ATTR_WO(smi_request);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) static DCDBAS_DEV_ATTR_RW(host_control_action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) static struct attribute *dcdbas_dev_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) &dev_attr_smi_data_buf_size.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) &dev_attr_smi_data_buf_phys_addr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) &dev_attr_smi_request.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) &dev_attr_host_control_action.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) &dev_attr_host_control_smi_type.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) &dev_attr_host_control_on_shutdown.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) static const struct attribute_group dcdbas_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) .attrs = dcdbas_dev_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) .bin_attrs = dcdbas_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) static int dcdbas_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) host_control_action = HC_ACTION_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) host_control_smi_type = HC_SMITYPE_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) dcdbas_pdev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /* Check if ACPI WSMT table specifies protected SMI buffer address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) error = dcdbas_check_wsmt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) if (error < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * BIOS SMI calls require buffer addresses be in 32-bit address space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) * This is done by setting the DMA mask below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) register_reboot_notifier(&dcdbas_reboot_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) dev_info(&dev->dev, "%s (version %s)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) DRIVER_DESCRIPTION, DRIVER_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) static int dcdbas_remove(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) unregister_reboot_notifier(&dcdbas_reboot_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) static struct platform_driver dcdbas_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) .probe = dcdbas_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) .remove = dcdbas_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) static const struct platform_device_info dcdbas_dev_info __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) .id = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) .dma_mask = DMA_BIT_MASK(32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) static struct platform_device *dcdbas_pdev_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * dcdbas_init: initialize driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) static int __init dcdbas_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) error = platform_driver_register(&dcdbas_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) dcdbas_pdev_reg = platform_device_register_full(&dcdbas_dev_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (IS_ERR(dcdbas_pdev_reg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) error = PTR_ERR(dcdbas_pdev_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) goto err_unregister_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) err_unregister_driver:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) platform_driver_unregister(&dcdbas_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * dcdbas_exit: perform driver cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) static void __exit dcdbas_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) * make sure functions that use dcdbas_pdev are called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) * before platform_device_unregister
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) unregister_reboot_notifier(&dcdbas_reboot_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) * We have to free the buffer here instead of dcdbas_remove
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) * because only in module exit function we can be sure that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) * all sysfs attributes belonging to this module have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) * released.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) if (dcdbas_pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) smi_data_buf_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (bios_buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) memunmap(bios_buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) platform_device_unregister(dcdbas_pdev_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) platform_driver_unregister(&dcdbas_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) subsys_initcall_sync(dcdbas_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) module_exit(dcdbas_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) MODULE_VERSION(DRIVER_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) MODULE_AUTHOR("Dell Inc.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) /* Any System or BIOS claiming to be by Dell */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) MODULE_ALIAS("dmi:*:[bs]vnD[Ee][Ll][Ll]*:*");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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