linux-imx

/*

**

**  PCI Lower Bus Adapter (LBA) manager

**

**  (c) Copyright 1999,2000 Grant Grundler

**  (c) Copyright 1999,2000 Hewlett-Packard Company

**

**  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 module primarily provides access to PCI bus (config/IOport

** spaces) on platforms with an SBA/LBA chipset. A/B/C/J/L/N-class

** with 4 digit model numbers - eg C3000 (and A400...sigh).

**

** LBA driver isn't as simple as the Dino driver because:

**   (a) this chip has substantial bug fixes between revisions

**       (Only one Dino bug has a software workaround :^(  )

**   (b) has more options which we don't (yet) support (DMA hints, OLARD)

**   (c) IRQ support lives in the I/O SAPIC driver (not with PCI driver)

**   (d) play nicely with both PAT and "Legacy" PA-RISC firmware (PDC).

**       (dino only deals with "Legacy" PDC)

**

** LBA driver passes the I/O SAPIC HPA to the I/O SAPIC driver.

** (I/O SAPIC is integratd in the LBA chip).

**

** FIXME: Add support to SBA and LBA drivers for DMA hint sets

** FIXME: Add support for PCI card hot-plug (OLARD).

*/

​

#include <linux/delay.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/spinlock.h>

#include <linux/init.h>     /* for __init */

#include <linux/pci.h>

#include <linux/ioport.h>

#include <linux/slab.h>

​

#include <asm/byteorder.h>

#include <asm/pdc.h>

#include <asm/pdcpat.h>

#include <asm/page.h>

​

#include <asm/ropes.h>

#include <asm/hardware.h>   /* for register_parisc_driver() stuff */

#include <asm/parisc-device.h>

#include <asm/io.h>     /* read/write stuff */

​

#include "iommu.h"

​

#undef DEBUG_LBA    /* general stuff */

#undef DEBUG_LBA_PORT   /* debug I/O Port access */

#undef DEBUG_LBA_CFG    /* debug Config Space Access (ie PCI Bus walk) */

#undef DEBUG_LBA_PAT    /* debug PCI Resource Mgt code - PDC PAT only */

​

#undef FBB_SUPPORT  /* Fast Back-Back xfers - NOT READY YET */

​

​

#ifdef DEBUG_LBA

#define DBG(x...)   printk(x)

#else

#define DBG(x...)

#endif

​

#ifdef DEBUG_LBA_PORT

#define DBG_PORT(x...)  printk(x)

#else

#define DBG_PORT(x...)

#endif

​

#ifdef DEBUG_LBA_CFG

#define DBG_CFG(x...)   printk(x)

#else

#define DBG_CFG(x...)

#endif

​

#ifdef DEBUG_LBA_PAT

#define DBG_PAT(x...)   printk(x)

#else

#define DBG_PAT(x...)

#endif

​

​

/*

** Config accessor functions only pass in the 8-bit bus number and not

** the 8-bit "PCI Segment" number. Each LBA will be assigned a PCI bus

** number based on what firmware wrote into the scratch register.

**

** The "secondary" bus number is set to this before calling