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[~andy/linux] / arch / ppc / platforms / sbc82xx.c
1 /*
2  * SBC82XX platform support
3  *
4  * Author: Guy Streeter <streeter@redhat.com>
5  *
6  * Derived from: est8260_setup.c by Allen Curtis, ONZ
7  *
8  * Copyright 2004 Red Hat, Inc.
9  *
10  * This program is free software; you can redistribute  it and/or modify it
11  * under  the terms of  the GNU General  Public License as published by the
12  * Free Software Foundation;  either version 2 of the  License, or (at your
13  * option) any later version.
14  */
15
16 #include <linux/stddef.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/init.h>
20 #include <linux/pci.h>
21
22 #include <asm/mpc8260.h>
23 #include <asm/machdep.h>
24 #include <asm/io.h>
25 #include <asm/todc.h>
26 #include <asm/immap_cpm2.h>
27 #include <asm/pci.h>
28
29 static void (*callback_init_IRQ)(void);
30
31 extern unsigned char __res[sizeof(bd_t)];
32
33 extern void (*late_time_init)(void);
34
35 #ifdef CONFIG_GEN_RTC
36 TODC_ALLOC();
37
38 /*
39  * Timer init happens before mem_init but after paging init, so we cannot
40  * directly use ioremap() at that time.
41  * late_time_init() is call after paging init.
42  */
43
44 static void sbc82xx_time_init(void)
45 {
46         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
47
48         /* Set up CS11 for RTC chip */
49         mc->memc_br11=0;
50         mc->memc_or11=0xffff0836;
51         mc->memc_br11=SBC82xx_TODC_NVRAM_ADDR | 0x0801;
52
53         TODC_INIT(TODC_TYPE_MK48T59, 0, 0, SBC82xx_TODC_NVRAM_ADDR, 0);
54
55         todc_info->nvram_data =
56                 (unsigned int)ioremap(todc_info->nvram_data, 0x2000);
57         BUG_ON(!todc_info->nvram_data);
58         ppc_md.get_rtc_time     = todc_get_rtc_time;
59         ppc_md.set_rtc_time     = todc_set_rtc_time;
60         ppc_md.nvram_read_val   = todc_direct_read_val;
61         ppc_md.nvram_write_val  = todc_direct_write_val;
62         todc_time_init();
63 }
64 #endif /* CONFIG_GEN_RTC */
65
66 static volatile char *sbc82xx_i8259_map;
67 static char sbc82xx_i8259_mask = 0xff;
68 static DEFINE_SPINLOCK(sbc82xx_i8259_lock);
69
70 static void sbc82xx_i8259_mask_and_ack_irq(unsigned int irq_nr)
71 {
72         unsigned long flags;
73
74         irq_nr -= NR_SIU_INTS;
75
76         spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
77         sbc82xx_i8259_mask |= 1 << irq_nr;
78         (void) sbc82xx_i8259_map[1];    /* Dummy read */
79         sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
80         sbc82xx_i8259_map[0] = 0x20;    /* OCW2: Non-specific EOI */
81         spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
82 }
83
84 static void sbc82xx_i8259_mask_irq(unsigned int irq_nr)
85 {
86         unsigned long flags;
87
88         irq_nr -= NR_SIU_INTS;
89
90         spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
91         sbc82xx_i8259_mask |= 1 << irq_nr;
92         sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
93         spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
94 }
95
96 static void sbc82xx_i8259_unmask_irq(unsigned int irq_nr)
97 {
98         unsigned long flags;
99
100         irq_nr -= NR_SIU_INTS;
101
102         spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
103         sbc82xx_i8259_mask &= ~(1 << irq_nr);
104         sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
105         spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
106 }
107
108 static void sbc82xx_i8259_end_irq(unsigned int irq)
109 {
110         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))
111             && irq_desc[irq].action)
112                 sbc82xx_i8259_unmask_irq(irq);
113 }
114
115
116 struct hw_interrupt_type sbc82xx_i8259_ic = {
117         .typename = " i8259     ",
118         .enable = sbc82xx_i8259_unmask_irq,
119         .disable = sbc82xx_i8259_mask_irq,
120         .ack = sbc82xx_i8259_mask_and_ack_irq,
121         .end = sbc82xx_i8259_end_irq,
122 };
123
124 static irqreturn_t sbc82xx_i8259_demux(int dummy, void *dev_id)
125 {
126         int irq;
127
128         spin_lock(&sbc82xx_i8259_lock);
129
130         sbc82xx_i8259_map[0] = 0x0c;    /* OCW3: Read IR register on RD# pulse */
131         irq = sbc82xx_i8259_map[0] & 7; /* Read IRR */
132
133         if (irq == 7) {
134                 /* Possible spurious interrupt */
135                 int isr;
136                 sbc82xx_i8259_map[0] = 0x0b;    /* OCW3: Read IS register on RD# pulse */
137                 isr = sbc82xx_i8259_map[0];     /* Read ISR */
138
139                 if (!(isr & 0x80)) {
140                         printk(KERN_INFO "Spurious i8259 interrupt\n");
141                         return IRQ_HANDLED;
142                 }
143         }
144         __do_IRQ(NR_SIU_INTS + irq);
145         return IRQ_HANDLED;
146 }
147
148 static struct irqaction sbc82xx_i8259_irqaction = {
149         .handler = sbc82xx_i8259_demux,
150         .flags = IRQF_DISABLED,
151         .mask = CPU_MASK_NONE,
152         .name = "i8259 demux",
153 };
154
155 void __init sbc82xx_init_IRQ(void)
156 {
157         volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
158         volatile intctl_cpm2_t *ic = &cpm2_immr->im_intctl;
159         int i;
160
161         callback_init_IRQ();
162
163         /* u-boot doesn't always set the board up correctly */
164         mc->memc_br5 = 0;
165         mc->memc_or5 = 0xfff00856;
166         mc->memc_br5 = 0x22000801;
167
168         sbc82xx_i8259_map = ioremap(0x22008000, 2);
169         if (!sbc82xx_i8259_map) {
170                 printk(KERN_CRIT "Mapping i8259 interrupt controller failed\n");
171                 return;
172         }
173         
174         /* Set up the interrupt handlers for the i8259 IRQs */
175         for (i = NR_SIU_INTS; i < NR_SIU_INTS + 8; i++) {
176                 irq_desc[i].chip = &sbc82xx_i8259_ic;
177                 irq_desc[i].status |= IRQ_LEVEL;
178         }
179
180         /* make IRQ6 level sensitive */
181         ic->ic_siexr &= ~(1 << (14 - (SIU_INT_IRQ6 - SIU_INT_IRQ1)));
182         irq_desc[SIU_INT_IRQ6].status |= IRQ_LEVEL;
183
184         /* Initialise the i8259 */
185         sbc82xx_i8259_map[0] = 0x1b;    /* ICW1: Level, no cascade, ICW4 */
186         sbc82xx_i8259_map[1] = 0x00;    /* ICW2: vector base */
187                                         /* No ICW3 (no cascade) */
188         sbc82xx_i8259_map[1] = 0x01;    /* ICW4: 8086 mode, normal EOI */
189
190         sbc82xx_i8259_map[0] = 0x0b;    /* OCW3: Read IS register on RD# pulse */
191
192         sbc82xx_i8259_map[1] = sbc82xx_i8259_mask; /* Set interrupt mask */
193
194         /* Request cascade IRQ */
195         if (setup_irq(SIU_INT_IRQ6, &sbc82xx_i8259_irqaction)) {
196                 printk("Installation of i8259 IRQ demultiplexer failed.\n");
197         }
198 }
199
200 static int sbc82xx_pci_map_irq(struct pci_dev *dev, unsigned char idsel,
201                                unsigned char pin)
202 {
203         static char pci_irq_table[][4] = {
204                 /*
205                  * PCI IDSEL/INTPIN->INTLINE
206                  *  A      B      C      D
207                  */
208                 { SBC82xx_PIRQA, SBC82xx_PIRQB, SBC82xx_PIRQC, SBC82xx_PIRQD }, /* IDSEL 16 - PMC slot */
209                 { SBC82xx_PC_IRQA, SBC82xx_PC_IRQB, -1,  -1  },                 /* IDSEL 17 - CardBus */
210                 { SBC82xx_PIRQA, SBC82xx_PIRQB, SBC82xx_PIRQC, SBC82xx_PIRQD }, /* IDSEL 18 - PCI-X bridge */
211         };
212
213         const long min_idsel = 16, max_idsel = 18, irqs_per_slot = 4;
214
215         return PCI_IRQ_TABLE_LOOKUP;
216 }
217
218 static void __devinit quirk_sbc8260_cardbus(struct pci_dev *pdev)
219 {
220         uint32_t ctrl;
221
222         if (pdev->bus->number != 0 || pdev->devfn != PCI_DEVFN(17, 0))
223                 return;
224
225         printk(KERN_INFO "Setting up CardBus controller\n");
226
227         /* Set P2CCLK bit in System Control Register */
228         pci_read_config_dword(pdev, 0x80, &ctrl);
229         ctrl |= (1<<27);
230         pci_write_config_dword(pdev, 0x80, ctrl);
231
232         /* Set MFUNC up for PCI IRQ routing via INTA and INTB, and LEDs. */
233         pci_write_config_dword(pdev, 0x8c, 0x00c01d22);
234
235 }
236 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_1420, quirk_sbc8260_cardbus);
237
238 void __init
239 m82xx_board_init(void)
240 {
241         /* u-boot may be using one of the FCC Ethernet devices.
242            Use the MAC address to the SCC. */
243         __res[offsetof(bd_t, bi_enetaddr[5])] &= ~3;
244
245         /* Anything special for this platform */
246         callback_init_IRQ       = ppc_md.init_IRQ;
247
248         ppc_md.init_IRQ         = sbc82xx_init_IRQ;
249         ppc_md.pci_map_irq      = sbc82xx_pci_map_irq;
250 #ifdef CONFIG_GEN_RTC
251         ppc_md.time_init        = NULL;
252         ppc_md.get_rtc_time     = NULL;
253         ppc_md.set_rtc_time     = NULL;
254         ppc_md.nvram_read_val   = NULL;
255         ppc_md.nvram_write_val  = NULL;
256         late_time_init          = sbc82xx_time_init;
257 #endif /* CONFIG_GEN_RTC */
258 }