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1da177e4 LT |
1 | /* |
2 | * include/asm-sh/io_bigsur.c | |
3 | * | |
4 | * By Dustin McIntire (dustin@sensoria.com) (c)2001 | |
5 | * Derived from io_hd64465.h, which bore the message: | |
6 | * By Greg Banks <gbanks@pocketpenguins.com> | |
7 | * (c) 2000 PocketPenguins Inc. | |
8 | * and from io_hd64461.h, which bore the message: | |
9 | * Copyright 2000 Stuart Menefy (stuart.menefy@st.com) | |
10 | * | |
11 | * May be copied or modified under the terms of the GNU General Public | |
12 | * License. See linux/COPYING for more information. | |
13 | * | |
14 | * IO functions for a Hitachi Big Sur Evaluation Board. | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <asm/machvec.h> | |
21 | #include <asm/io.h> | |
22 | #include <asm/bigsur/bigsur.h> | |
23 | ||
24 | /* Low iomap maps port 0-1K to addresses in 8byte chunks */ | |
25 | #define BIGSUR_IOMAP_LO_THRESH 0x400 | |
26 | #define BIGSUR_IOMAP_LO_SHIFT 3 | |
27 | #define BIGSUR_IOMAP_LO_MASK ((1<<BIGSUR_IOMAP_LO_SHIFT)-1) | |
28 | #define BIGSUR_IOMAP_LO_NMAP (BIGSUR_IOMAP_LO_THRESH>>BIGSUR_IOMAP_LO_SHIFT) | |
29 | static u32 bigsur_iomap_lo[BIGSUR_IOMAP_LO_NMAP]; | |
30 | static u8 bigsur_iomap_lo_shift[BIGSUR_IOMAP_LO_NMAP]; | |
31 | ||
32 | /* High iomap maps port 1K-64K to addresses in 1K chunks */ | |
33 | #define BIGSUR_IOMAP_HI_THRESH 0x10000 | |
34 | #define BIGSUR_IOMAP_HI_SHIFT 10 | |
35 | #define BIGSUR_IOMAP_HI_MASK ((1<<BIGSUR_IOMAP_HI_SHIFT)-1) | |
36 | #define BIGSUR_IOMAP_HI_NMAP (BIGSUR_IOMAP_HI_THRESH>>BIGSUR_IOMAP_HI_SHIFT) | |
37 | static u32 bigsur_iomap_hi[BIGSUR_IOMAP_HI_NMAP]; | |
38 | static u8 bigsur_iomap_hi_shift[BIGSUR_IOMAP_HI_NMAP]; | |
39 | ||
40 | #ifndef MAX | |
41 | #define MAX(a,b) ((a)>(b)?(a):(b)) | |
42 | #endif | |
43 | ||
44 | void bigsur_port_map(u32 baseport, u32 nports, u32 addr, u8 shift) | |
45 | { | |
46 | u32 port, endport = baseport + nports; | |
47 | ||
48 | pr_debug("bigsur_port_map(base=0x%0x, n=0x%0x, addr=0x%08x)\n", | |
49 | baseport, nports, addr); | |
50 | ||
51 | for (port = baseport ; | |
52 | port < endport && port < BIGSUR_IOMAP_LO_THRESH ; | |
53 | port += (1<<BIGSUR_IOMAP_LO_SHIFT)) { | |
54 | pr_debug(" maplo[0x%x] = 0x%08x\n", port, addr); | |
55 | bigsur_iomap_lo[port>>BIGSUR_IOMAP_LO_SHIFT] = addr; | |
56 | bigsur_iomap_lo_shift[port>>BIGSUR_IOMAP_LO_SHIFT] = shift; | |
57 | addr += (1<<(BIGSUR_IOMAP_LO_SHIFT)); | |
58 | } | |
59 | ||
60 | for (port = MAX(baseport, BIGSUR_IOMAP_LO_THRESH) ; | |
61 | port < endport && port < BIGSUR_IOMAP_HI_THRESH ; | |
62 | port += (1<<BIGSUR_IOMAP_HI_SHIFT)) { | |
63 | pr_debug(" maphi[0x%x] = 0x%08x\n", port, addr); | |
64 | bigsur_iomap_hi[port>>BIGSUR_IOMAP_HI_SHIFT] = addr; | |
65 | bigsur_iomap_hi_shift[port>>BIGSUR_IOMAP_HI_SHIFT] = shift; | |
66 | addr += (1<<(BIGSUR_IOMAP_HI_SHIFT)); | |
67 | } | |
68 | } | |
69 | EXPORT_SYMBOL(bigsur_port_map); | |
70 | ||
71 | void bigsur_port_unmap(u32 baseport, u32 nports) | |
72 | { | |
73 | u32 port, endport = baseport + nports; | |
74 | ||
75 | pr_debug("bigsur_port_unmap(base=0x%0x, n=0x%0x)\n", baseport, nports); | |
76 | ||
77 | for (port = baseport ; | |
78 | port < endport && port < BIGSUR_IOMAP_LO_THRESH ; | |
79 | port += (1<<BIGSUR_IOMAP_LO_SHIFT)) { | |
80 | bigsur_iomap_lo[port>>BIGSUR_IOMAP_LO_SHIFT] = 0; | |
81 | } | |
82 | ||
83 | for (port = MAX(baseport, BIGSUR_IOMAP_LO_THRESH) ; | |
84 | port < endport && port < BIGSUR_IOMAP_HI_THRESH ; | |
85 | port += (1<<BIGSUR_IOMAP_HI_SHIFT)) { | |
86 | bigsur_iomap_hi[port>>BIGSUR_IOMAP_HI_SHIFT] = 0; | |
87 | } | |
88 | } | |
89 | EXPORT_SYMBOL(bigsur_port_unmap); | |
90 | ||
91 | unsigned long bigsur_isa_port2addr(unsigned long port) | |
92 | { | |
93 | unsigned long addr = 0; | |
94 | unsigned char shift; | |
95 | ||
96 | /* Physical address not in P0, do nothing */ | |
97 | if (PXSEG(port)) { | |
98 | addr = port; | |
99 | /* physical address in P0, map to P2 */ | |
100 | } else if (port >= 0x30000) { | |
101 | addr = P2SEGADDR(port); | |
102 | /* Big Sur I/O + HD64465 registers 0x10000-0x30000 */ | |
103 | } else if (port >= BIGSUR_IOMAP_HI_THRESH) { | |
104 | addr = BIGSUR_INTERNAL_BASE + (port - BIGSUR_IOMAP_HI_THRESH); | |
105 | /* Handle remapping of high IO/PCI IO ports */ | |
106 | } else if (port >= BIGSUR_IOMAP_LO_THRESH) { | |
107 | addr = bigsur_iomap_hi[port >> BIGSUR_IOMAP_HI_SHIFT]; | |
108 | shift = bigsur_iomap_hi_shift[port >> BIGSUR_IOMAP_HI_SHIFT]; | |
109 | ||
110 | if (addr != 0) | |
111 | addr += (port & BIGSUR_IOMAP_HI_MASK) << shift; | |
112 | } else { | |
113 | /* Handle remapping of low IO ports */ | |
114 | addr = bigsur_iomap_lo[port >> BIGSUR_IOMAP_LO_SHIFT]; | |
115 | shift = bigsur_iomap_lo_shift[port >> BIGSUR_IOMAP_LO_SHIFT]; | |
116 | ||
117 | if (addr != 0) | |
118 | addr += (port & BIGSUR_IOMAP_LO_MASK) << shift; | |
119 | } | |
120 | ||
121 | pr_debug("%s(0x%08lx) = 0x%08lx\n", __FUNCTION__, port, addr); | |
122 | ||
123 | return addr; | |
124 | } | |
125 |