1/*
2   * File...........: linux/include/asm-s390x/idals.h
3   * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4   * Bugreports.to..: <Linux390@de.ibm.com>
5   * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a
6
7   * History of changes
8   * 07/24/00 new file
9 */
10#include <linux/config.h>
11#include <asm/irq.h>
12
13#define IDA_SIZE_LOG 11 /* 11 for 2k , 12 for 4k */
14#define IDA_BLOCK_SIZE (1L<<IDA_SIZE_LOG)
15
16static inline addr_t *
17idal_alloc ( int nridaws )
18{
19	if ( nridaws > 33 )
20		BUG();
21	return kmalloc(nridaws * sizeof(addr_t), GFP_ATOMIC | GFP_DMA );
22}
23
24static inline void
25idal_free ( addr_t *idal )
26{
27	kfree (idal);
28}
29
30#if defined(CONFIG_ARCH_S390X)
31extern unsigned long __create_idal(unsigned long address, int count);
32#endif
33
34/*
35 * Function: set_normalized_cda
36 * sets the address of the data in CCW
37 * if necessary it allocates an IDAL and sets sthe appropriate flags
38 */
39static inline int
40set_normalized_cda(ccw1_t * ccw, unsigned long address)
41{
42	int ret = 0;
43
44#if defined(CONFIG_ARCH_S390X)
45	if (((address + ccw->count) >> 31) != 0) {
46		if (ccw->flags & CCW_FLAG_IDA)
47			BUG();
48		address = __create_idal(address, ccw->count);
49		if (address)
50			ccw->flags |= CCW_FLAG_IDA;
51		else
52			ret = -ENOMEM;
53	}
54#endif
55	ccw->cda = (__u32) address;
56	return ret;
57}
58
59/*
60 * Function: clear_normalized_cda
61 * releases any allocated IDAL related to the CCW
62 */
63static inline void
64clear_normalized_cda ( ccw1_t * ccw )
65{
66#if defined(CONFIG_ARCH_S390X)
67	if ( ccw -> flags & CCW_FLAG_IDA ) {
68		idal_free ( (addr_t *)(unsigned long) (ccw -> cda ));
69		ccw -> flags &= ~CCW_FLAG_IDA;
70	}
71#endif
72	ccw -> cda = 0;
73}
74
75