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path: root/drivers/pci/hotplug/cpqphp_nvram.c
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Diffstat (limited to 'drivers/pci/hotplug/cpqphp_nvram.c')
-rw-r--r--drivers/pci/hotplug/cpqphp_nvram.c666
1 files changed, 666 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpqphp_nvram.c b/drivers/pci/hotplug/cpqphp_nvram.c
new file mode 100644
index 00000000000..ac98a11bd1e
--- /dev/null
+++ b/drivers/pci/hotplug/cpqphp_nvram.c
@@ -0,0 +1,666 @@
+/*
+ * 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.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to <greg@kroah.com>
+ *
+ */
+
+#include <linux/config.h>
+#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/init.h>
+#include <asm/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;
+
+static spinlock_t int15_lock; /* lock for ordering int15_bios_call() */
+
+
+/* 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", __FUNCTION__, 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);
+
+ /* initialize our int15 lock */
+ spin_lock_init(&int15_lock);
+}
+
+
+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 = (struct pci_resource*) 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 = (struct pci_resource*) 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 = (struct pci_resource*) 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 = (struct pci_resource*) 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;
+}
+
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