/* * ccio-rm-dma.c: *	DMA management routines for first generation cache-coherent machines. *	"Real Mode" operation refers to U2/Uturn chip operation. The chip *      can perform coherency checks w/o using the I/O MMU. That's all we *      need until support for more than 4GB phys mem is needed. *  *	This is the trivial case - basically what x86 does. * *	Drawbacks of using Real Mode are: *	o outbound DMA is slower since one isn't using the prefetching *	  U2 can do for outbound DMA. *	o Ability to do scatter/gather in HW is also lost. *      o only known to work with PCX-W processor. (eg C360) *        (PCX-U/U+ are not coherent with U2 in real mode.) * * * 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. * * * Original version/author: *      CVSROOT=:pserver:anonymous@198.186.203.37:/cvsroot/linux-parisc *      cvs -z3 co linux/arch/parisc/kernel/dma-rm.c * *	(C) Copyright 2000 Philipp Rumpf <prumpf@tux.org> * * * Adopted for The Puffin Group's parisc-linux port by Grant Grundler. *	(C) Copyright 2000 Grant Grundler <grundler@puffin.external.hp.com> *	 */#include <linux/types.h>#include <linux/init.h>#include <linux/mm.h>#include <linux/string.h>#include <linux/pci.h>#include <asm/uaccess.h>#include <asm/pgalloc.h>#include <asm/io.h>#include <asm/hardware.h>#include <asm/page.h>/* Only chose "ccio" since that's what HP-UX calls it....** Make it easier for folks to migrate from one to the other :^)*/#define MODULE_NAME "ccio"#define U2_IOA_RUNWAY 0x580#define U2_BC_GSC     0x501#define UTURN_IOA_RUNWAY 0x581#define UTURN_BC_GSC     0x502#define IS_U2(id) ( \    (((id)->hw_type == HPHW_IOA) && ((id)->hversion == U2_IOA_RUNWAY)) || \    (((id)->hw_type == HPHW_BCPORT) && ((id)->hversion == U2_BC_GSC))  \)#define IS_UTURN(id) ( \    (((id)->hw_type == HPHW_IOA) && ((id)->hversion == UTURN_IOA_RUNWAY)) || \    (((id)->hw_type == HPHW_BCPORT) && ((id)->hversion == UTURN_BC_GSC))  \)static int ccio_dma_supported( struct pci_dev *dev, u64 mask){	if (dev == NULL) {		printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");		BUG();		return(0);	}	/* only support 32-bit devices (ie PCI/GSC) */	return((int) (mask >= 0xffffffffUL));}static void *ccio_alloc_consistent(struct pci_dev *dev, size_t size,				 dma_addr_t *handle){	void *ret;		ret = (void *)__get_free_pages(GFP_ATOMIC, get_order(size));	if (ret != NULL) {		memset(ret, 0, size);		*handle = virt_to_phys(ret);	}	return ret;}	static void ccio_free_consistent(struct pci_dev *dev, size_t size,			       void *vaddr, dma_addr_t handle){	free_pages((unsigned long)vaddr, get_order(size));}static dma_addr_t ccio_map_single(struct pci_dev *dev, void *ptr, size_t size,			  int direction){	return virt_to_phys(ptr);}static void ccio_unmap_single(struct pci_dev *dev, dma_addr_t dma_addr,			    size_t size, int direction){	/* Nothing to do */}static int ccio_map_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction){	int tmp = nents;        /* KISS: map each buffer seperately. */	while (nents) {		sg_dma_address(sglist) = ccio_map_single(dev, sglist->address, sglist->length, direction);		sg_dma_len(sglist) = sglist->length;		nents--;		sglist++;	}	return tmp;}static void ccio_unmap_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction){#if 0	while (nents) {		ccio_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);		nents--;		sglist++;	}	return;#else	/* Do nothing (copied from current ccio_unmap_single()  :^) */#endif}static struct pci_dma_ops ccio_ops = {	ccio_dma_supported,	ccio_alloc_consistent,	ccio_free_consistent,	ccio_map_single,	ccio_unmap_single,	ccio_map_sg,	ccio_unmap_sg,	NULL,                   /* dma_sync_single : NOP for U2 */	NULL,                   /* dma_sync_sg     : ditto */};/*** Determine if u2 should claim this chip (return 0) or not (return 1).** If so, initialize the chip and tell other partners in crime they** have work to do.*/static intccio_probe(struct parisc_device *dev){	printk(KERN_INFO "%s found %s at 0x%lx\n", MODULE_NAME,			dev->id.hversion == U2_BC_GSC ? "U2" : "UTurn",			dev->hpa);/*** FIXME - should check U2 registers to verify it's really running** in "Real Mode".*/#if 0/* will need this for "Virtual Mode" operation */	ccio_hw_init(ccio_dev);	ccio_common_init(ccio_dev);#endif	hppa_dma_ops = &ccio_ops;	return 0;}static struct parisc_device_id ccio_tbl[] = {	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, U2_BC_GSC, 0xc },	{ HPHW_BCPORT, HVERSION_REV_ANY_ID, UTURN_BC_GSC, 0xc },	{ 0, }};static struct parisc_driver ccio_driver = {        name:           "U2/Uturn",        id_table:       ccio_tbl,        probe:          ccio_probe,};void __init ccio_init(void){	register_parisc_driver(&ccio_driver);}