1 /************************************************************************/
2 /* This module supports the iSeries PCI bus interrupt handling */
3 /* Copyright (C) 20yy <Robert L Holtorf> <IBM Corp> */
5 /* This program is free software; you can redistribute it and/or modify */
6 /* it under the terms of the GNU General Public License as published by */
7 /* the Free Software Foundation; either version 2 of the License, or */
8 /* (at your option) any later version. */
10 /* This program is distributed in the hope that it will be useful, */
11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
13 /* GNU General Public License for more details. */
15 /* You should have received a copy of the GNU General Public License */
16 /* along with this program; if not, write to the: */
17 /* Free Software Foundation, Inc., */
18 /* 59 Temple Place, Suite 330, */
19 /* Boston, MA 02111-1307 USA */
20 /************************************************************************/
21 /* Change Activity: */
22 /* Created, December 13, 2000 by Wayne Holm */
23 /* End Change Activity */
24 /************************************************************************/
25 #include <linux/pci.h>
26 #include <linux/init.h>
27 #include <linux/threads.h>
28 #include <linux/smp.h>
29 #include <linux/param.h>
30 #include <linux/string.h>
31 #include <linux/bootmem.h>
32 #include <linux/ide.h>
34 #include <linux/irq.h>
35 #include <linux/spinlock.h>
36 #include <asm/ppcdebug.h>
38 #include <asm/iSeries/HvCallPci.h>
39 #include <asm/iSeries/HvCallXm.h>
40 #include <asm/iSeries/iSeries_irq.h>
41 #include <asm/iSeries/XmPciLpEvent.h>
43 static unsigned int iSeries_startup_IRQ(unsigned int irq
);
44 static void iSeries_shutdown_IRQ(unsigned int irq
);
45 static void iSeries_enable_IRQ(unsigned int irq
);
46 static void iSeries_disable_IRQ(unsigned int irq
);
47 static void iSeries_end_IRQ(unsigned int irq
);
49 static hw_irq_controller iSeries_IRQ_handler
= {
50 .typename
= "iSeries irq controller",
51 .startup
= iSeries_startup_IRQ
,
52 .shutdown
= iSeries_shutdown_IRQ
,
53 .enable
= iSeries_enable_IRQ
,
54 .disable
= iSeries_disable_IRQ
,
55 .end
= iSeries_end_IRQ
58 /* This maps virtual irq numbers to real irqs */
59 unsigned int virt_irq_to_real_map
[NR_IRQS
];
61 /* The next available virtual irq number */
62 /* Note: the pcnet32 driver assumes irq numbers < 2 aren't valid. :( */
63 static int next_virtual_irq
= 2;
65 /* This is called by init_IRQ. set in ppc_md.init_IRQ by iSeries_setup.c */
66 void __init
iSeries_init_IRQ(void)
68 /* Register PCI event handler and open an event path */
73 * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
74 * It calculates the irq value for the slot.
75 * Note that subBusNumber is always 0 (at the moment at least).
77 int __init
iSeries_allocate_IRQ(HvBusNumber busNumber
,
78 HvSubBusNumber subBusNumber
, HvAgentId deviceId
)
80 unsigned int realirq
, virtirq
;
81 u8 idsel
= (deviceId
>> 4);
82 u8 function
= deviceId
& 7;
84 virtirq
= next_virtual_irq
++;
85 realirq
= ((busNumber
- 1) << 6) + ((idsel
- 1) << 3) + function
;
86 virt_irq_to_real_map
[virtirq
] = realirq
;
88 irq_desc
[virtirq
].handler
= &iSeries_IRQ_handler
;
92 #define REAL_IRQ_TO_BUS(irq) ((((irq) >> 6) & 0xff) + 1)
93 #define REAL_IRQ_TO_IDSEL(irq) ((((irq) >> 3) & 7) + 1)
94 #define REAL_IRQ_TO_FUNC(irq) ((irq) & 7)
96 /* This is called by iSeries_activate_IRQs */
97 static unsigned int iSeries_startup_IRQ(unsigned int irq
)
99 u32 bus
, deviceId
, function
, mask
;
100 const u32 subBus
= 0;
101 unsigned int rirq
= virt_irq_to_real_map
[irq
];
103 bus
= REAL_IRQ_TO_BUS(rirq
);
104 function
= REAL_IRQ_TO_FUNC(rirq
);
105 deviceId
= (REAL_IRQ_TO_IDSEL(rirq
) << 4) + function
;
107 /* Link the IRQ number to the bridge */
108 HvCallXm_connectBusUnit(bus
, subBus
, deviceId
, irq
);
110 /* Unmask bridge interrupts in the FISR */
111 mask
= 0x01010000 << function
;
112 HvCallPci_unmaskFisr(bus
, subBus
, deviceId
, mask
);
117 * This is called out of iSeries_fixup to activate interrupt
118 * generation for usable slots
120 void __init
iSeries_activate_IRQs()
126 irq_desc_t
*desc
= get_irq_desc(irq
);
128 if (desc
&& desc
->handler
&& desc
->handler
->startup
) {
129 spin_lock_irqsave(&desc
->lock
, flags
);
130 desc
->handler
->startup(irq
);
131 spin_unlock_irqrestore(&desc
->lock
, flags
);
136 /* this is not called anywhere currently */
137 static void iSeries_shutdown_IRQ(unsigned int irq
)
139 u32 bus
, deviceId
, function
, mask
;
140 const u32 subBus
= 0;
141 unsigned int rirq
= virt_irq_to_real_map
[irq
];
143 /* irq should be locked by the caller */
144 bus
= REAL_IRQ_TO_BUS(rirq
);
145 function
= REAL_IRQ_TO_FUNC(rirq
);
146 deviceId
= (REAL_IRQ_TO_IDSEL(rirq
) << 4) + function
;
148 /* Invalidate the IRQ number in the bridge */
149 HvCallXm_connectBusUnit(bus
, subBus
, deviceId
, 0);
151 /* Mask bridge interrupts in the FISR */
152 mask
= 0x01010000 << function
;
153 HvCallPci_maskFisr(bus
, subBus
, deviceId
, mask
);
157 * This will be called by device drivers (via disable_IRQ)
158 * to disable INTA in the bridge interrupt status register.
160 static void iSeries_disable_IRQ(unsigned int irq
)
162 u32 bus
, deviceId
, function
, mask
;
163 const u32 subBus
= 0;
164 unsigned int rirq
= virt_irq_to_real_map
[irq
];
166 /* The IRQ has already been locked by the caller */
167 bus
= REAL_IRQ_TO_BUS(rirq
);
168 function
= REAL_IRQ_TO_FUNC(rirq
);
169 deviceId
= (REAL_IRQ_TO_IDSEL(rirq
) << 4) + function
;
171 /* Mask secondary INTA */
173 HvCallPci_maskInterrupts(bus
, subBus
, deviceId
, mask
);
174 PPCDBG(PPCDBG_BUSWALK
, "iSeries_disable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
175 bus
, subBus
, deviceId
, irq
);
179 * This will be called by device drivers (via enable_IRQ)
180 * to enable INTA in the bridge interrupt status register.
182 static void iSeries_enable_IRQ(unsigned int irq
)
184 u32 bus
, deviceId
, function
, mask
;
185 const u32 subBus
= 0;
186 unsigned int rirq
= virt_irq_to_real_map
[irq
];
188 /* The IRQ has already been locked by the caller */
189 bus
= REAL_IRQ_TO_BUS(rirq
);
190 function
= REAL_IRQ_TO_FUNC(rirq
);
191 deviceId
= (REAL_IRQ_TO_IDSEL(rirq
) << 4) + function
;
193 /* Unmask secondary INTA */
195 HvCallPci_unmaskInterrupts(bus
, subBus
, deviceId
, mask
);
196 PPCDBG(PPCDBG_BUSWALK
, "iSeries_enable_IRQ 0x%02X.%02X.%02X 0x%04X\n",
197 bus
, subBus
, deviceId
, irq
);
201 * Need to define this so ppc_irq_dispatch_handler will NOT call
202 * enable_IRQ at the end of interrupt handling. However, this does
203 * nothing because there is not enough information provided to do
204 * the EOI HvCall. This is done by XmPciLpEvent.c
206 static void iSeries_end_IRQ(unsigned int irq
)