diff options
Diffstat (limited to 'drivers/pci/hotplug/cpqphp_nvram.c')
| -rw-r--r-- | drivers/pci/hotplug/cpqphp_nvram.c | 650 |
1 files changed, 650 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpqphp_nvram.c b/drivers/pci/hotplug/cpqphp_nvram.c new file mode 100644 index 0000000000..7a65d427ac --- /dev/null +++ b/drivers/pci/hotplug/cpqphp_nvram.c @@ -0,0 +1,650 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Compaq Hot Plug Controller Driver + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * + * All rights reserved. + * + * Send feedback to <greg@kroah.com> + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/proc_fs.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <linux/pci.h> +#include <linux/pci_hotplug.h> +#include <linux/uaccess.h> +#include "cpqphp.h" +#include "cpqphp_nvram.h" + + +#define ROM_INT15_PHY_ADDR 0x0FF859 +#define READ_EV 0xD8A4 +#define WRITE_EV 0xD8A5 + +struct register_foo { + union { + unsigned long lword; /* eax */ + unsigned short word; /* ax */ + + struct { + unsigned char low; /* al */ + unsigned char high; /* ah */ + } byte; + } data; + + unsigned char opcode; /* see below */ + unsigned long length; /* if the reg. is a pointer, how much data */ +} __attribute__ ((packed)); + +struct all_reg { + struct register_foo eax_reg; + struct register_foo ebx_reg; + struct register_foo ecx_reg; + struct register_foo edx_reg; + struct register_foo edi_reg; + struct register_foo esi_reg; + struct register_foo eflags_reg; +} __attribute__ ((packed)); + + +struct ev_hrt_header { + u8 Version; + u8 num_of_ctrl; + u8 next; +}; + +struct ev_hrt_ctrl { + u8 bus; + u8 device; + u8 function; + u8 mem_avail; + u8 p_mem_avail; + u8 io_avail; + u8 bus_avail; + u8 next; +}; + + +static u8 evbuffer_init; +static u8 evbuffer_length; +static u8 evbuffer[1024]; + +static void __iomem *compaq_int15_entry_point; + +/* lock for ordering int15_bios_call() */ +static DEFINE_SPINLOCK(int15_lock); + + +/* This is a series of function that deals with + * setting & getting the hotplug resource table in some environment variable. + */ + +/* + * We really shouldn't be doing this unless there is a _very_ good reason to!!! + * greg k-h + */ + + +static u32 add_byte(u32 **p_buffer, u8 value, u32 *used, u32 *avail) +{ + u8 **tByte; + + if ((*used + 1) > *avail) + return(1); + + *((u8 *)*p_buffer) = value; + tByte = (u8 **)p_buffer; + (*tByte)++; + *used += 1; + return(0); +} + + +static u32 add_dword(u32 **p_buffer, u32 value, u32 *used, u32 *avail) +{ + if ((*used + 4) > *avail) + return(1); + + **p_buffer = value; + (*p_buffer)++; + *used += 4; + return(0); +} + + +/* + * check_for_compaq_ROM + * + * this routine verifies that the ROM OEM string is 'COMPAQ' + * + * returns 0 for non-Compaq ROM, 1 for Compaq ROM + */ +static int check_for_compaq_ROM(void __iomem *rom_start) +{ + u8 temp1, temp2, temp3, temp4, temp5, temp6; + int result = 0; + + temp1 = readb(rom_start + 0xffea + 0); + temp2 = readb(rom_start + 0xffea + 1); + temp3 = readb(rom_start + 0xffea + 2); + temp4 = readb(rom_start + 0xffea + 3); + temp5 = readb(rom_start + 0xffea + 4); + temp6 = readb(rom_start + 0xffea + 5); + if ((temp1 == 'C') && + (temp2 == 'O') && + (temp3 == 'M') && + (temp4 == 'P') && + (temp5 == 'A') && + (temp6 == 'Q')) { + result = 1; + } + dbg("%s - returned %d\n", __func__, result); + return result; +} + + +static u32 access_EV(u16 operation, u8 *ev_name, u8 *buffer, u32 *buf_size) +{ + unsigned long flags; + int op = operation; + int ret_val; + + if (!compaq_int15_entry_point) + return -ENODEV; + + spin_lock_irqsave(&int15_lock, flags); + __asm__ ( + "xorl %%ebx,%%ebx\n" \ + "xorl %%edx,%%edx\n" \ + "pushf\n" \ + "push %%cs\n" \ + "cli\n" \ + "call *%6\n" + : "=c" (*buf_size), "=a" (ret_val) + : "a" (op), "c" (*buf_size), "S" (ev_name), + "D" (buffer), "m" (compaq_int15_entry_point) + : "%ebx", "%edx"); + spin_unlock_irqrestore(&int15_lock, flags); + + return((ret_val & 0xFF00) >> 8); +} + + +/* + * load_HRT + * + * Read the hot plug Resource Table from NVRAM + */ +static int load_HRT(void __iomem *rom_start) +{ + u32 available; + u32 temp_dword; + u8 temp_byte = 0xFF; + u32 rc; + + if (!check_for_compaq_ROM(rom_start)) + return -ENODEV; + + available = 1024; + + /* Now load the EV */ + temp_dword = available; + + rc = access_EV(READ_EV, "CQTHPS", evbuffer, &temp_dword); + + evbuffer_length = temp_dword; + + /* We're maintaining the resource lists so write FF to invalidate old + * info + */ + temp_dword = 1; + + rc = access_EV(WRITE_EV, "CQTHPS", &temp_byte, &temp_dword); + + return rc; +} + + +/* + * store_HRT + * + * Save the hot plug Resource Table in NVRAM + */ +static u32 store_HRT(void __iomem *rom_start) +{ + u32 *buffer; + u32 *pFill; + u32 usedbytes; + u32 available; + u32 temp_dword; + u32 rc; + u8 loop; + u8 numCtrl = 0; + struct controller *ctrl; + struct pci_resource *resNode; + struct ev_hrt_header *p_EV_header; + struct ev_hrt_ctrl *p_ev_ctrl; + + available = 1024; + + if (!check_for_compaq_ROM(rom_start)) + return(1); + + buffer = (u32 *) evbuffer; + + if (!buffer) + return(1); + + pFill = buffer; + usedbytes = 0; + + p_EV_header = (struct ev_hrt_header *) pFill; + + ctrl = cpqhp_ctrl_list; + + /* The revision of this structure */ + rc = add_byte(&pFill, 1 + ctrl->push_flag, &usedbytes, &available); + if (rc) + return(rc); + + /* The number of controllers */ + rc = add_byte(&pFill, 1, &usedbytes, &available); + if (rc) + return(rc); + + while (ctrl) { + p_ev_ctrl = (struct ev_hrt_ctrl *) pFill; + + numCtrl++; + + /* The bus number */ + rc = add_byte(&pFill, ctrl->bus, &usedbytes, &available); + if (rc) + return(rc); + + /* The device Number */ + rc = add_byte(&pFill, PCI_SLOT(ctrl->pci_dev->devfn), &usedbytes, &available); + if (rc) + return(rc); + + /* The function Number */ + rc = add_byte(&pFill, PCI_FUNC(ctrl->pci_dev->devfn), &usedbytes, &available); + if (rc) + return(rc); + + /* Skip the number of available entries */ + rc = add_dword(&pFill, 0, &usedbytes, &available); + if (rc) + return(rc); + + /* Figure out memory Available */ + + resNode = ctrl->mem_head; + + loop = 0; + + while (resNode) { + loop++; + + /* base */ + rc = add_dword(&pFill, resNode->base, &usedbytes, &available); + if (rc) + return(rc); + + /* length */ + rc = add_dword(&pFill, resNode->length, &usedbytes, &available); + if (rc) + return(rc); + + resNode = resNode->next; + } + + /* Fill in the number of entries */ + p_ev_ctrl->mem_avail = loop; + + /* Figure out prefetchable memory Available */ + + resNode = ctrl->p_mem_head; + + loop = 0; + + while (resNode) { + loop++; + + /* base */ + rc = add_dword(&pFill, resNode->base, &usedbytes, &available); + if (rc) + return(rc); + + /* length */ + rc = add_dword(&pFill, resNode->length, &usedbytes, &available); + if (rc) + return(rc); + + resNode = resNode->next; + } + + /* Fill in the number of entries */ + p_ev_ctrl->p_mem_avail = loop; + + /* Figure out IO Available */ + + resNode = ctrl->io_head; + + loop = 0; + + while (resNode) { + loop++; + + /* base */ + rc = add_dword(&pFill, resNode->base, &usedbytes, &available); + if (rc) + return(rc); + + /* length */ + rc = add_dword(&pFill, resNode->length, &usedbytes, &available); + if (rc) + return(rc); + + resNode = resNode->next; + } + + /* Fill in the number of entries */ + p_ev_ctrl->io_avail = loop; + + /* Figure out bus Available */ + + resNode = ctrl->bus_head; + + loop = 0; + + while (resNode) { + loop++; + + /* base */ + rc = add_dword(&pFill, resNode->base, &usedbytes, &available); + if (rc) + return(rc); + + /* length */ + rc = add_dword(&pFill, resNode->length, &usedbytes, &available); + if (rc) + return(rc); + + resNode = resNode->next; + } + + /* Fill in the number of entries */ + p_ev_ctrl->bus_avail = loop; + + ctrl = ctrl->next; + } + + p_EV_header->num_of_ctrl = numCtrl; + + /* Now store the EV */ + + temp_dword = usedbytes; + + rc = access_EV(WRITE_EV, "CQTHPS", (u8 *) buffer, &temp_dword); + + dbg("usedbytes = 0x%x, length = 0x%x\n", usedbytes, temp_dword); + + evbuffer_length = temp_dword; + + if (rc) { + err(msg_unable_to_save); + return(1); + } + + return(0); +} + + +void compaq_nvram_init(void __iomem *rom_start) +{ + if (rom_start) + compaq_int15_entry_point = (rom_start + ROM_INT15_PHY_ADDR - ROM_PHY_ADDR); + + dbg("int15 entry = %p\n", compaq_int15_entry_point); +} + + +int compaq_nvram_load(void __iomem *rom_start, struct controller *ctrl) +{ + u8 bus, device, function; + u8 nummem, numpmem, numio, numbus; + u32 rc; + u8 *p_byte; + struct pci_resource *mem_node; + struct pci_resource *p_mem_node; + struct pci_resource *io_node; + struct pci_resource *bus_node; + struct ev_hrt_ctrl *p_ev_ctrl; + struct ev_hrt_header *p_EV_header; + + if (!evbuffer_init) { + /* Read the resource list information in from NVRAM */ + if (load_HRT(rom_start)) + memset(evbuffer, 0, 1024); + + evbuffer_init = 1; + } + + /* If we saved information in NVRAM, use it now */ + p_EV_header = (struct ev_hrt_header *) evbuffer; + + /* The following code is for systems where version 1.0 of this + * driver has been loaded, but doesn't support the hardware. + * In that case, the driver would incorrectly store something + * in NVRAM. + */ + if ((p_EV_header->Version == 2) || + ((p_EV_header->Version == 1) && !ctrl->push_flag)) { + p_byte = &(p_EV_header->next); + + p_ev_ctrl = (struct ev_hrt_ctrl *) &(p_EV_header->next); + + p_byte += 3; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) + return 2; + + bus = p_ev_ctrl->bus; + device = p_ev_ctrl->device; + function = p_ev_ctrl->function; + + while ((bus != ctrl->bus) || + (device != PCI_SLOT(ctrl->pci_dev->devfn)) || + (function != PCI_FUNC(ctrl->pci_dev->devfn))) { + nummem = p_ev_ctrl->mem_avail; + numpmem = p_ev_ctrl->p_mem_avail; + numio = p_ev_ctrl->io_avail; + numbus = p_ev_ctrl->bus_avail; + + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) + return 2; + + /* Skip forward to the next entry */ + p_byte += (nummem + numpmem + numio + numbus) * 8; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) + return 2; + + p_ev_ctrl = (struct ev_hrt_ctrl *) p_byte; + + p_byte += 3; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) + return 2; + + bus = p_ev_ctrl->bus; + device = p_ev_ctrl->device; + function = p_ev_ctrl->function; + } + + nummem = p_ev_ctrl->mem_avail; + numpmem = p_ev_ctrl->p_mem_avail; + numio = p_ev_ctrl->io_avail; + numbus = p_ev_ctrl->bus_avail; + + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) + return 2; + + while (nummem--) { + mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL); + + if (!mem_node) + break; + + mem_node->base = *(u32 *)p_byte; + dbg("mem base = %8.8x\n", mem_node->base); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(mem_node); + return 2; + } + + mem_node->length = *(u32 *)p_byte; + dbg("mem length = %8.8x\n", mem_node->length); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(mem_node); + return 2; + } + + mem_node->next = ctrl->mem_head; + ctrl->mem_head = mem_node; + } + + while (numpmem--) { + p_mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL); + + if (!p_mem_node) + break; + + p_mem_node->base = *(u32 *)p_byte; + dbg("pre-mem base = %8.8x\n", p_mem_node->base); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(p_mem_node); + return 2; + } + + p_mem_node->length = *(u32 *)p_byte; + dbg("pre-mem length = %8.8x\n", p_mem_node->length); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(p_mem_node); + return 2; + } + + p_mem_node->next = ctrl->p_mem_head; + ctrl->p_mem_head = p_mem_node; + } + + while (numio--) { + io_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL); + + if (!io_node) + break; + + io_node->base = *(u32 *)p_byte; + dbg("io base = %8.8x\n", io_node->base); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(io_node); + return 2; + } + + io_node->length = *(u32 *)p_byte; + dbg("io length = %8.8x\n", io_node->length); + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(io_node); + return 2; + } + + io_node->next = ctrl->io_head; + ctrl->io_head = io_node; + } + + while (numbus--) { + bus_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL); + + if (!bus_node) + break; + + bus_node->base = *(u32 *)p_byte; + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(bus_node); + return 2; + } + + bus_node->length = *(u32 *)p_byte; + p_byte += 4; + + if (p_byte > ((u8 *)p_EV_header + evbuffer_length)) { + kfree(bus_node); + return 2; + } + + bus_node->next = ctrl->bus_head; + ctrl->bus_head = bus_node; + } + + /* If all of the following fail, we don't have any resources for + * hot plug add + */ + rc = 1; + rc &= cpqhp_resource_sort_and_combine(&(ctrl->mem_head)); + rc &= cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head)); + rc &= cpqhp_resource_sort_and_combine(&(ctrl->io_head)); + rc &= cpqhp_resource_sort_and_combine(&(ctrl->bus_head)); + + if (rc) + return(rc); + } else { + if ((evbuffer[0] != 0) && (!ctrl->push_flag)) + return 1; + } + + return 0; +} + + +int compaq_nvram_store(void __iomem *rom_start) +{ + int rc = 1; + + if (rom_start == NULL) + return -ENODEV; + + if (evbuffer_init) { + rc = store_HRT(rom_start); + if (rc) + err(msg_unable_to_save); + } + return rc; +} + |