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