patch-2.4.20 linux-2.4.20/drivers/gsc/eisa_enumerator.c

• Lines: 519
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/drivers/gsc/eisa_enumerator.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/drivers/gsc/eisa_enumerator.c linux-2.4.20/drivers/gsc/eisa_enumerator.c
@@ -0,0 +1,518 @@
+/*
+ * eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines
+ *
+ * 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.
+ *
+ * Copyright (c) 2002 Daniel Engstrom <5116@telia.com>
+ *
+ */
+
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <asm/gsc.h>
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+
+#include <asm/eisa_bus.h>
+#include <asm/eisa_eeprom.h>
+
+
+/*
+ * Todo:
+ * 
+ * PORT init with MASK attr and other size than byte
+ * MEMORY with other decode than 20 bit
+ * CRC stuff
+ * FREEFORM stuff
+ */
+
+#define EPI 0xc80
+#define NUM_SLOT 16
+#define SLOT2PORT(x) (x<<12)
+
+
+/* macros to handle unaligned accesses and 
+ * byte swapping. The data in the EEPROM is
+ * little-endian on the big-endian PAROSC */
+#define get_8(x) (*(u_int8_t*)(x))
+
+static inline u_int16_t get_16(const unsigned char *x)
+{ 
+	return (x[1] << 8) | x[0];
+}
+
+static inline u_int32_t get_32(const unsigned char *x)
+{
+	return (x[3] << 24) | (x[2] << 16) | (x[1] << 8) | x[0];
+}
+
+static inline u_int32_t get_24(const unsigned char *x)
+{
+	return (x[2] << 24) | (x[1] << 16) | (x[0] << 8);
+}
+
+static void print_eisa_id(char *s, u_int32_t id)
+{
+	char vendor[4];
+	int rev;
+	int device;
+	
+	rev = id & 0xff;
+	id >>= 8;
+	device = id & 0xff;
+	id >>= 8;
+	vendor[3] = '\0';
+	vendor[2] = '@' + (id & 0x1f);
+	id >>= 5;	
+	vendor[1] = '@' + (id & 0x1f);
+	id >>= 5;	
+	vendor[0] = '@' + (id & 0x1f);
+	id >>= 5;	
+	
+	sprintf(s, "%s%02X%02X", vendor, device, rev);
+}
+       
+static int configure_memory(const unsigned char *buf, 
+		       struct resource *mem_parent,
+		       char *name)
+{
+	int len;
+	u_int8_t c;
+	int i;
+	struct resource *res;
+	
+	len=0;
+	
+	for (i=0;i<HPEE_MEMORY_MAX_ENT;i++) {
+		c = get_8(buf+len);
+		
+		if (NULL != (res = kmalloc(sizeof(struct resource), GFP_KERNEL))) {
+			int result;
+			
+			res->name = name;
+			res->start = mem_parent->start + get_24(buf+len+2);
+			res->end = res->start + get_16(buf+len+5)*1024;
+			res->flags = IORESOURCE_MEM;
+			printk("memory %lx-%lx ", res->start, res->end);
+			result = request_resource(mem_parent, res);
+			if (result < 0) {
+				printk("\n" KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
+				return result;
+			}
+		}
+		 	
+		len+=7;      
+	
+		if (!(c & HPEE_MEMORY_MORE)) {
+			break;
+		}
+	}
+	
+	return len;
+}
+
+
+static int configure_irq(const unsigned char *buf)
+{
+	int len;
+	u_int8_t c;
+	int i;
+	
+	len=0;
+	
+	for (i=0;i<HPEE_IRQ_MAX_ENT;i++) {
+		c = get_8(buf+len);
+		
+		printk("IRQ %d ", c & HPEE_IRQ_CHANNEL_MASK);
+		if (c & HPEE_IRQ_TRIG_LEVEL) {
+			eisa_make_irq_level(c & HPEE_IRQ_CHANNEL_MASK);
+		} else {
+			eisa_make_irq_edge(c & HPEE_IRQ_CHANNEL_MASK);
+		}
+		
+		len+=2; 
+		/* hpux seems to allow for
+		 * two bytes of irq data but only defines one of
+		 * them, I think */
+		if  (!(c & HPEE_IRQ_MORE)) {
+			break;
+		}
+	}
+	
+	return len;
+}
+
+
+static int configure_dma(const unsigned char *buf)
+{
+	int len;
+	u_int8_t c;
+	int i;
+	
+	len=0;
+	
+	for (i=0;i<HPEE_DMA_MAX_ENT;i++) {
+		c = get_8(buf+len);
+		printk("DMA %d ", c&HPEE_DMA_CHANNEL_MASK);
+		/* fixme: maybe initialize the dma channel withthe timing ? */
+		len+=2;      
+		if (!(c & HPEE_DMA_MORE)) {
+			break;
+		}
+	}
+	
+	return len;
+}
+
+static int configure_port(const unsigned char *buf, struct resource *io_parent,
+		     char *board)
+{
+	int len;
+	u_int8_t c;
+	int i;
+	struct resource *res;
+	int result;
+	
+	len=0;
+	
+	for (i=0;i<HPEE_PORT_MAX_ENT;i++) {
+		c = get_8(buf+len);
+		
+		if (NULL != (res = kmalloc(sizeof(struct resource), GFP_KERNEL))) {
+			res->name = board;
+			res->start = get_16(buf+len+1);
+			res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1;
+			res->flags = IORESOURCE_IO;
+			printk("ioports %lx-%lx ", res->start, res->end);
+			result = request_resource(io_parent, res);
+			if (result < 0) {
+				printk("\n" KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
+				return result;
+			}
+		}
+
+		len+=3;      
+		if (!(c & HPEE_PORT_MORE)) {
+			break;
+		}
+	}
+	
+	return len;
+}
+
+
+/* byte 1 and 2 is the port number to write
+ * and at byte 3 the value to write starts.
+ * I assume that there are and- and or- masks
+ * here when HPEE_PORT_INIT_MASK is set but I have 
+ * not yet encountered this. */
+static int configure_port_init(const unsigned char *buf)
+{
+	int len=0;
+	u_int8_t c;
+	
+	while (len<HPEE_PORT_INIT_MAX_LEN) {
+		int s=0;
+		c = get_8(buf+len);
+		
+		switch (c & HPEE_PORT_INIT_WIDTH_MASK)  {
+		 case HPEE_PORT_INIT_WIDTH_BYTE:
+			s=1;
+			if (c & HPEE_PORT_INIT_MASK) {
+				printk("\n" KERN_WARNING "port_init: unverified mask attribute\n");
+				outb((inb(get_16(buf+len+1) & 
+					  get_8(buf+len+3)) | 
+				      get_8(buf+len+4)), get_16(buf+len+1));
+				      
+			} else {
+				outb(get_8(buf+len+3), get_16(buf+len+1));
+				      
+			}
+			break;
+		 case HPEE_PORT_INIT_WIDTH_WORD:
+			s=2;
+			if (c & HPEE_PORT_INIT_MASK) {
+ 				printk(KERN_WARNING "port_init: unverified mask attribute\n");
+				       outw((inw(get_16(buf+len+1)) &
+					     get_16(buf+len+3)) |
+					    get_16(buf+len+5), 
+					    get_16(buf+len+1));
+			} else {
+				outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1));
+			}
+			break;
+		 case HPEE_PORT_INIT_WIDTH_DWORD:
+			s=4;
+			if (c & HPEE_PORT_INIT_MASK) {
+ 				printk("\n" KERN_WARNING "port_init: unverified mask attribute\n");
+				outl((inl(get_16(buf+len+1) &
+					  get_32(buf+len+3)) |
+				      get_32(buf+len+7)), get_16(buf+len+1));
+			} else {
+				outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1));
+			}
+
+			break;
+		 default:
+			printk("\n" KERN_ERR "Invalid port init word %02x\n", c);
+			return 0;
+		}
+		
+		if (c & HPEE_PORT_INIT_MASK) {   
+			s*=2;
+		}
+		
+		len+=s+3;
+		if (!(c & HPEE_PORT_INIT_MORE)) {
+			break;
+		}
+	}
+	
+	return len;
+}
+
+static int configure_choise(const unsigned char *buf, u_int8_t *info)
+{
+	int len;
+	
+	/* theis record contain the value of the functions
+	 * configuration choises and an info byte which 
+	 * describes which other records to expect in this 
+	 * function */
+	len = get_8(buf);
+	*info=get_8(buf+len+1);
+	 
+	return len+2;
+}
+
+static int configure_type_string(const unsigned char *buf) 
+{
+	int len;
+	
+	/* just skip past the type field */
+	len = get_8(buf);
+	if (len > 80) {
+		printk("\n" KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n", len);
+	}
+	
+	return 1+len;
+}
+
+static int configure_function(const unsigned char *buf, int *more) 
+{
+	/* the init field seems to be a two-byte field
+	 * which is non-zero if there are an other function following
+	 * I think it is the length of the function def 
+	 */
+	*more = get_16(buf);
+	
+	return 2;
+}
+
+static int parse_slot_config(int slot,
+			     const unsigned char *buf,
+			     struct eeprom_eisa_slot_info *es, 
+			     struct resource *io_parent,
+			     struct resource *mem_parent)
+{
+	int res=0;
+	int function_len;
+	unsigned int pos=0;
+	unsigned int maxlen;
+	int num_func=0;
+	u_int8_t flags;
+	int p0;
+	
+	char *board;
+	int id_string_used=0;
+	
+	if (NULL == (board = kmalloc(8, GFP_KERNEL))) {
+		return -1;
+	}
+	print_eisa_id(board, es->eisa_slot_id);
+	printk(KERN_INFO "EISA slot %d: %s %s ", 
+	       slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA");
+	
+	maxlen = es->config_data_length < HPEE_MAX_LENGTH ?
+			 es->config_data_length : HPEE_MAX_LENGTH;
+	while ((pos < maxlen) && (num_func <= es->num_functions)) {
+		pos+=configure_function(buf+pos, &function_len); 
+		
+		if (!function_len) {
+			break;
+		}
+		num_func++;
+		p0 = pos;
+		pos += configure_choise(buf+pos, &flags);
+
+		if (flags & HPEE_FUNCTION_INFO_F_DISABLED) {
+			/* function disabled, skip silently */
+			pos = p0 + function_len;
+			continue;
+		}
+		if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) {
+			/* I have no idea how to handle this */
+			printk("function %d have free-form confgiuration, skipping ",
+				num_func);
+			pos = p0 + function_len;
+			continue;
+		}
+
+		/* the ordering of the sections need
+		 * more investigation.
+		 * Currently I think that memory comaed before IRQ
+		 * I assume the order is LSB to MSB in the 
+		 * info flags 
+		 * eg type, memory, irq, dma, port, HPEE_PORT_init 
+		 */
+
+		if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) {
+			pos += configure_type_string(buf+pos);
+		}
+		
+		if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) {
+			id_string_used=1;
+			pos += configure_memory(buf+pos, mem_parent, board);
+		} 
+		
+		if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) {
+			pos += configure_irq(buf+pos);
+		} 
+		
+		if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) {
+			pos += configure_dma(buf+pos);
+		} 
+		
+		if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) {
+			id_string_used=1;
+			pos += configure_port(buf+pos, io_parent, board);
+		} 
+		
+		if (flags &  HPEE_FUNCTION_INFO_HAVE_PORT_INIT) {
+			pos += configure_port_init(buf+pos);
+		}
+		
+		if (p0 + function_len < pos) {
+			printk("\n" KERN_ERR "eisa_enumerator: function %d length mis-match "
+			       "got %d, expected %d\n",
+			       num_func, pos-p0, function_len);
+			res=-1;
+			break;
+		}
+		pos = p0 + function_len;
+	}
+	printk("\n");
+	if (!id_string_used) {
+		kfree(board);
+	}
+	
+	if (pos != es->config_data_length) {
+		printk(KERN_ERR "eisa_enumerator: config data length mis-match got %d, expected %d\n",
+			pos, es->config_data_length);
+		res=-1;
+	}
+	
+	if (num_func != es->num_functions) {
+		printk(KERN_ERR "eisa_enumerator: number of functions mis-match got %d, expected %d\n",
+			num_func, es->num_functions);
+		res=-2;
+	}
+	
+	return res;
+	
+}
+
+static int init_slot(int slot, struct eeprom_eisa_slot_info *es)
+{
+	unsigned int id;
+	
+	char id_string[8];
+	
+	if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) {
+		/* try to read the id of the board in the slot */
+		id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI));
+		
+		if (0xffffffff == id) {
+			/* this board is not here or it does not 
+			 * support readid 
+			 */
+			printk(KERN_ERR "EISA slot %d a configured board was not detected (", 
+			       slot);
+			
+			print_eisa_id(id_string, es->eisa_slot_id);
+			printk(" expected %s)\n", id_string);
+		
+			return -1;	
+
+		}
+		if (es->eisa_slot_id != id) {
+			print_eisa_id(id_string, id);
+			printk(KERN_ERR "EISA slot %d id mis-match: got %s", 
+			       slot, id_string);
+			
+			print_eisa_id(id_string, es->eisa_slot_id);
+			printk(" expected %s \n", id_string);
+		
+			return -1;	
+			
+		}
+	}
+	
+	/* now: we need to enable the board if 
+	 * it supports enabling and run through
+	 * the port init sction if present
+	 * and finally record any interrupt polarity
+	 */
+	if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) {
+		/* enable board */
+		outb(0x01| inb(SLOT2PORT(slot)+EPI+4),
+		     SLOT2PORT(slot)+EPI+4);
+	}
+	
+	return 0;
+}
+
+
+int eisa_enumerator(unsigned long eeprom_addr,
+		    struct resource *io_parent, struct resource *mem_parent) 
+{
+	int i;
+	struct eeprom_header *eh;
+	static char eeprom_buf[HPEE_MAX_LENGTH];
+	
+	for (i=0; i < HPEE_MAX_LENGTH; i++) {
+		eeprom_buf[i] = gsc_readb(eeprom_addr+i);
+	}
+	
+	printk(KERN_INFO "Enumerating EISA bus\n");
+		    	
+	eh = (struct eeprom_header*)(eeprom_buf);
+	for (i=0;i<eh->num_slots;i++) {
+		struct eeprom_eisa_slot_info *es;
+		
+		es = (struct eeprom_eisa_slot_info*)
+			(&eeprom_buf[HPEE_SLOT_INFO(i)]);
+	        
+		if (-1==init_slot(i+1, es)) {
+			return -1;
+			
+		}
+		
+		if (es->config_data_offset < HPEE_MAX_LENGTH) {
+			if (parse_slot_config(i+1, &eeprom_buf[es->config_data_offset],
+					      es, io_parent, mem_parent)) {
+				return -1;
+			}
+		} else {
+			printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n",es->config_data_offset);
+			return -1;
+		}
+	}
+	return 0;
+}
+