1 // SPDX-License-Identifier: GPL-2.0-only
10  *  See Documentation/userspace-api/dcdbas.rst for more information.
12  *  Copyright (C) 1995-2006 Dell Inc.
17 #include <linux/dma-mapping.h>
39 #define DRIVER_VERSION		"5.6.0-3.4"
57 	smi_buffer->virt = dma_alloc_coherent(&dcdbas_pdev->dev, size,  in dcdbas_smi_alloc()
58 					      &smi_buffer->dma, GFP_KERNEL);  in dcdbas_smi_alloc()
59 	if (!smi_buffer->virt) {  in dcdbas_smi_alloc()
60 		dev_dbg(&dcdbas_pdev->dev,  in dcdbas_smi_alloc()
63 		return -ENOMEM;  in dcdbas_smi_alloc()
65 	smi_buffer->size = size;  in dcdbas_smi_alloc()
67 	dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",  in dcdbas_smi_alloc()
68 		__func__, (u32)smi_buffer->dma, smi_buffer->size);  in dcdbas_smi_alloc()
76 	if (!smi_buffer->virt)  in dcdbas_smi_free()
79 	dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",  in dcdbas_smi_free()
80 		__func__, (u32)smi_buffer->dma, smi_buffer->size);  in dcdbas_smi_free()
81 	dma_free_coherent(&dcdbas_pdev->dev, smi_buffer->size,  in dcdbas_smi_free()
82 			  smi_buffer->virt, smi_buffer->dma);  in dcdbas_smi_free()
83 	smi_buffer->virt = NULL;  in dcdbas_smi_free()
84 	smi_buffer->dma = 0;  in dcdbas_smi_free()
85 	smi_buffer->size = 0;  in dcdbas_smi_free()
112 		return -EINVAL;  in smi_data_buf_realloc()
136 	return sysfs_emit(buf, "%x\n", (u32)smi_buf.dma);  in smi_data_buf_phys_addr_show()
185 		return -EINVAL;  in smi_data_write()
259 		dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",  in raise_smi()
261 		return -EBUSY;  in raise_smi()
270 		: "a" (smi_cmd->command_code),  in raise_smi()
271 		  "d" (smi_cmd->command_address),  in raise_smi()
272 		  "b" (smi_cmd->ebx),  in raise_smi()
273 		  "c" (smi_cmd->ecx)  in raise_smi()
288 	if (smi_cmd->magic != SMI_CMD_MAGIC) {  in dcdbas_smi_request()
289 		dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",  in dcdbas_smi_request()
291 		return -EBADR;  in dcdbas_smi_request()
325 		ret = -ENODEV;  in smi_request_store()
345 		 * will be from memremap() of a non-memory address if WSMT  in smi_request_store()
350 		smi_cmd->ebx = (u32)smi_buf.dma +  in smi_request_store()
361 		ret = -EINVAL;  in smi_request_store()
385 	apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;  in host_control_smi()
391 		data = (u8 *)&smi_buf.dma;  in host_control_smi()
401 		/* first set status to -1 as called by spec */  in host_control_smi()
412 			num_ticks--;  in host_control_smi()
414 				return -ETIME;  in host_control_smi()
422 		data = (u8 *)&smi_buf.dma;  in host_control_smi()
445 		while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {  in host_control_smi()
446 			num_ticks--;  in host_control_smi()
448 				return -ETIME;  in host_control_smi()
453 		dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",  in host_control_smi()
455 		return -ENOSYS;  in host_control_smi()
466  * host control action to perform on shutdown.  It is safe to
482 		dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __func__);  in dcdbas_host_control()
487 		dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",  in dcdbas_host_control()
496 		apm_cmd->command = ESM_APM_POWER_CYCLE;  in dcdbas_host_control()
497 		apm_cmd->reserved = 0;  in dcdbas_host_control()
498 		*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;  in dcdbas_host_control()
501 		apm_cmd->command = ESM_APM_POWER_CYCLE;  in dcdbas_host_control()
502 		apm_cmd->reserved = 0;  in dcdbas_host_control()
503 		*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;  in dcdbas_host_control()
524 	if (strncmp(eps->smm_comm_buff_anchor, SMM_EPS_SIG, 4) != 0)  in check_eps_table()
527 	if (checksum(addr, eps->length) != 0)  in check_eps_table()
547 	if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS) ||  in dcdbas_check_wsmt()
548 	    !(wsmt->protection_flags & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION))  in dcdbas_check_wsmt()
558 		if (sscanf(dev->name, "30[%16llx;%8llx]", &bios_buf_paddr,  in dcdbas_check_wsmt()
564 	     addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table));  in dcdbas_check_wsmt()
572 		dev_dbg(&dcdbas_pdev->dev, "found WSMT, but no firmware buffer found\n");  in dcdbas_check_wsmt()
573 		return -ENODEV;  in dcdbas_check_wsmt()
575 	bios_buf_paddr = eps->smm_comm_buff_addr;  in dcdbas_check_wsmt()
576 	remap_size = eps->num_of_4k_pages * PAGE_SIZE;  in dcdbas_check_wsmt()
580 	 * Get physical address of buffer and map to virtual address.  in dcdbas_check_wsmt()
584 		dev_warn(&dcdbas_pdev->dev, "found WSMT, but buffer address is above 4GB\n");  in dcdbas_check_wsmt()
585 		return -EINVAL;  in dcdbas_check_wsmt()
596 		dev_warn(&dcdbas_pdev->dev, "found WSMT, but failed to map buffer\n");  in dcdbas_check_wsmt()
597 		return -ENOMEM;  in dcdbas_check_wsmt()
601 	smi_buf.dma = bios_buf_paddr + 8;  in dcdbas_check_wsmt()
603 	smi_buf.size = remap_size - 8;  in dcdbas_check_wsmt()
606 	dev_info(&dcdbas_pdev->dev,  in dcdbas_check_wsmt()
607 		 "WSMT found, using firmware-provided SMI buffer.\n");  in dcdbas_check_wsmt()
683 	 * BIOS SMI calls require buffer addresses be in 32-bit address space.  in dcdbas_probe()
684 	 * This is done by setting the DMA mask below.  in dcdbas_probe()
686 	error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32));  in dcdbas_probe()
690 	error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);  in dcdbas_probe()
696 	dev_info(&dev->dev, "%s (version %s)\n",  in dcdbas_probe()
705 	sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);  in dcdbas_remove()