2 * BK Id: SCCS/s.uninorth.h 1.15 10/29/02 16:41:56 benh
5 * uninorth.h: definitions for using the "UniNorth" host bridge chip
6 * from Apple. This chip is used on "Core99" machines
10 #ifndef __ASM_UNINORTH_H__
11 #define __ASM_UNINORTH_H__
14 * Uni-N config space reg. definitions
19 /* Address ranges selection. This one should work with Bandit too */
20 #define UNI_N_ADDR_SELECT 0x48
21 #define UNI_N_ADDR_COARSE_MASK 0xffff0000 /* 256Mb regions at *0000000 */
22 #define UNI_N_ADDR_FINE_MASK 0x0000ffff /* 16Mb regions at f*000000 */
25 #define UNI_N_CFG_GART_BASE 0x8c
26 #define UNI_N_CFG_AGP_BASE 0x90
27 #define UNI_N_CFG_GART_CTRL 0x94
28 #define UNI_N_CFG_INTERNAL_STATUS 0x98
30 /* UNI_N_CFG_GART_CTRL bits definitions */
31 #define UNI_N_CFG_GART_INVAL 0x00000001
32 #define UNI_N_CFG_GART_ENABLE 0x00000100
33 #define UNI_N_CFG_GART_2xRESET 0x00010000
34 #define UNI_N_CFG_GART_DISSBADET 0x00020000
36 /* My understanding of UniNorth AGP as of UniNorth rev 1.0x,
37 * revision 1.5 (x4 AGP) may need further changes.
39 * AGP_BASE register contains the base address of the AGP aperture on
40 * the AGP bus. It doesn't seem to be visible to the CPU as of UniNorth 1.x,
41 * even if decoding of this address range is enabled in the address select
42 * register. Apparently, the only supported bases are 256Mb multiples
43 * (high 4 bits of that register).
45 * GART_BASE register appear to contain the physical address of the GART
46 * in system memory in the high address bits (page aligned), and the
47 * GART size in the low order bits (number of GART pages)
49 * The GART format itself is one 32bits word per physical memory page.
50 * This word contains, in little-endian format (!!!), the physical address
51 * of the page in the high bits, and what appears to be an "enable" bit
52 * in the LSB bit (0) that must be set to 1 when the entry is valid.
54 * Obviously, the GART is not cache coherent and so any change to it
55 * must be flushed to memory (or maybe just make the GART space non
56 * cachable). AGP memory itself doens't seem to be cache coherent neither.
58 * In order to invalidate the GART (which is probably necessary to inval
59 * the bridge internal TLBs), the following sequence has to be written,
60 * in order, to the GART_CTRL register:
62 * UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_INVAL
63 * UNI_N_CFG_GART_ENABLE
64 * UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_2xRESET
65 * UNI_N_CFG_GART_ENABLE
67 * As far as AGP "features" are concerned, it looks like fast write may
68 * not be supported but this has to be confirmed.
70 * Turning on AGP seem to require a double invalidate operation, one before
71 * setting the AGP command register, on after.
73 * Turning off AGP seems to require the following sequence: first wait
74 * for the AGP to be idle by reading the internal status register, then
75 * write in that order to the GART_CTRL register:
77 * UNI_N_CFG_GART_ENABLE | UNI_N_CFG_GART_INVAL
79 * UNI_N_CFG_GART_2xRESET
84 * Uni-N memory mapped reg. definitions
86 * Those registers are Big-Endian !!
88 * Their meaning come from either Darwin and/or from experiments I made with
89 * the bootrom, I'm not sure about their exact meaning yet
93 /* Version of the UniNorth chip */
94 #define UNI_N_VERSION 0x0000 /* Known versions: 3,7 and 8 */
96 /* This register is used to enable/disable various clocks */
97 #define UNI_N_CLOCK_CNTL 0x0020
98 #define UNI_N_CLOCK_CNTL_PCI 0x00000001 /* PCI2 clock control */
99 #define UNI_N_CLOCK_CNTL_GMAC 0x00000002 /* GMAC clock control */
100 #define UNI_N_CLOCK_CNTL_FW 0x00000004 /* FireWire clock control */
101 #define UNI_N_CLOCK_CNTL_ATA100 0x00000010 /* ATA-100 clock control (U2) */
103 /* Power Management control */
104 #define UNI_N_POWER_MGT 0x0030
105 #define UNI_N_POWER_MGT_NORMAL 0x00
106 #define UNI_N_POWER_MGT_IDLE2 0x01
107 #define UNI_N_POWER_MGT_SLEEP 0x02
109 /* This register is configured by Darwin depending on the UniN
112 #define UNI_N_ARB_CTRL 0x0040
113 #define UNI_N_ARB_CTRL_QACK_DELAY_SHIFT 15
114 #define UNI_N_ARB_CTRL_QACK_DELAY_MASK 0x0e1f8000
115 #define UNI_N_ARB_CTRL_QACK_DELAY 0x30
116 #define UNI_N_ARB_CTRL_QACK_DELAY105 0x00
118 /* This one _might_ return the CPU number of the CPU reading it;
119 * the bootROM decides wether to boot or to sleep/spinloop depending
120 * on this register beeing 0 or not
122 #define UNI_N_CPU_NUMBER 0x0050
124 /* This register appear to be read by the bootROM to decide what
125 * to do on a non-recoverable reset (powerup or wakeup)
127 #define UNI_N_HWINIT_STATE 0x0070
128 #define UNI_N_HWINIT_STATE_SLEEPING 0x01
129 #define UNI_N_HWINIT_STATE_RUNNING 0x02
130 /* This last bit appear to be used by the bootROM to know the second
131 * CPU has started and will enter it's sleep loop with IP=0
133 #define UNI_N_HWINIT_STATE_CPU1_FLAG 0x10000000
135 /* Uninorth 1.5 rev. has additional perf. monitor registers at 0xf00-0xf50 */
137 #endif /* __ASM_UNINORTH_H__ */
138 #endif /* __KERNEL__ */