arch/ppc/platforms/4xx/ep405.c

   1 /*
   2  * Embedded Planet 405GP board
   3  * http://www.embeddedplanet.com
   4  *
   5  * Author: Matthew Locke <mlocke@mvista.com>
   6  *
   7  * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
   8  * the terms of the GNU General Public License version 2.  This program
   9  * is licensed "as is" without any warranty of any kind, whether express
  10  * or implied.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/pci.h>
  14 #include <asm/system.h>
  15 #include <asm/pci-bridge.h>
  16 #include <asm/machdep.h>
  17 #include <asm/todc.h>
  18 #include <asm/ocp.h>
  19 #include <asm/ibm_ocp_pci.h>
  20
  21 #undef DEBUG
  22 #ifdef DEBUG
  23 #define DBG(x...) printk(x)
  24 #else
  25 #define DBG(x...)
  26 #endif
  27
  28 u8 *ep405_bcsr;
  29 u8 *ep405_nvram;
  30
  31 static struct {
  32         u8 cpld_xirq_select;
  33         int pci_idsel;
  34         int irq;
  35 } ep405_devtable[] = {
  36 #ifdef CONFIG_EP405PC
  37         {0x07, 0x0E, 25},               /* EP405PC: USB */
  38 #endif
  39 };
  40
  41 int __init
  42 ppc405_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  43 {
  44         int i;
  45
  46         /* AFAICT this is only called a few times during PCI setup, so
  47            performance is not critical */
  48         for (i = 0; i < ARRAY_SIZE(ep405_devtable); i++) {
  49                 if (idsel == ep405_devtable[i].pci_idsel)
  50                         return ep405_devtable[i].irq;
  51         }
  52         return -1;
  53 };
  54
  55 void __init
  56 ep405_setup_arch(void)
  57 {
  58         ppc4xx_setup_arch();
  59
  60         ibm_ocp_set_emac(0, 0);
  61
  62         if (__res.bi_nvramsize == 512*1024) {
  63                 /* FIXME: we should properly handle NVRTCs of different sizes */
  64                 TODC_INIT(TODC_TYPE_DS1557, ep405_nvram, ep405_nvram, ep405_nvram, 8);
  65         }
  66 }
  67
  68 void __init
  69 bios_fixup(struct pci_controller *hose, struct pcil0_regs *pcip)
  70 {
  71 #ifdef CONFIG_PCI
  72         unsigned int bar_response, bar;
  73         /*
  74          * Expected PCI mapping:
  75          *
  76          *  PLB addr             PCI memory addr
  77          *  ---------------------       ---------------------
  78          *  0000'0000 - 7fff'ffff <---  0000'0000 - 7fff'ffff
  79          *  8000'0000 - Bfff'ffff --->  8000'0000 - Bfff'ffff
  80          *
  81          *  PLB addr             PCI io addr
  82          *  ---------------------       ---------------------
  83          *  e800'0000 - e800'ffff --->  0000'0000 - 0001'0000
  84          *
  85          */
  86
  87         /* Disable region zero first */
  88         out_le32((void *) &(pcip->pmm[0].ma), 0x00000000);
  89         /* PLB starting addr, PCI: 0x80000000 */
  90         out_le32((void *) &(pcip->pmm[0].la), 0x80000000);
  91         /* PCI start addr, 0x80000000 */
  92         out_le32((void *) &(pcip->pmm[0].pcila), PPC405_PCI_MEM_BASE);
  93         /* 512MB range of PLB to PCI */
  94         out_le32((void *) &(pcip->pmm[0].pciha), 0x00000000);
  95         /* Enable no pre-fetch, enable region */
  96         out_le32((void *) &(pcip->pmm[0].ma), ((0xffffffff -
  97                                                 (PPC405_PCI_UPPER_MEM -
  98                                                  PPC405_PCI_MEM_BASE)) | 0x01));
  99
 100         /* Disable region one */
 101         out_le32((void *) &(pcip->pmm[1].ma), 0x00000000);
 102         out_le32((void *) &(pcip->pmm[1].la), 0x00000000);
 103         out_le32((void *) &(pcip->pmm[1].pcila), 0x00000000);
 104         out_le32((void *) &(pcip->pmm[1].pciha), 0x00000000);
 105         out_le32((void *) &(pcip->pmm[1].ma), 0x00000000);
 106         out_le32((void *) &(pcip->ptm1ms), 0x00000000);
 107
 108         /* Disable region two */
 109         out_le32((void *) &(pcip->pmm[2].ma), 0x00000000);
 110         out_le32((void *) &(pcip->pmm[2].la), 0x00000000);
 111         out_le32((void *) &(pcip->pmm[2].pcila), 0x00000000);
 112         out_le32((void *) &(pcip->pmm[2].pciha), 0x00000000);
 113         out_le32((void *) &(pcip->pmm[2].ma), 0x00000000);
 114         out_le32((void *) &(pcip->ptm2ms), 0x00000000);
 115
 116         /* Configure PTM (PCI->PLB) region 1 */
 117         out_le32((void *) &(pcip->ptm1la), 0x00000000); /* PLB base address */
 118         /* Disable PTM region 2 */
 119         out_le32((void *) &(pcip->ptm2ms), 0x00000000);
 120
 121         /* Zero config bars */
 122         for (bar = PCI_BASE_ADDRESS_1; bar <= PCI_BASE_ADDRESS_2; bar += 4) {
 123                 early_write_config_dword(hose, hose->first_busno,
 124                                          PCI_FUNC(hose->first_busno), bar,
 125                                          0x00000000);
 126                 early_read_config_dword(hose, hose->first_busno,
 127                                         PCI_FUNC(hose->first_busno), bar,
 128                                         &bar_response);
 129                 DBG("BUS %d, device %d, Function %d bar 0x%8.8x is 0x%8.8x\n",
 130                     hose->first_busno, PCI_SLOT(hose->first_busno),
 131                     PCI_FUNC(hose->first_busno), bar, bar_response);
 132         }
 133         /* end workaround */
 134 #endif
 135 }
 136
 137 void __init
 138 ep405_map_io(void)
 139 {
 140         bd_t *bip = &__res;
 141
 142         ppc4xx_map_io();
 143
 144         ep405_bcsr = ioremap(EP405_BCSR_PADDR, EP405_BCSR_SIZE);
 145
 146         if (bip->bi_nvramsize > 0) {
 147                 ep405_nvram = ioremap(EP405_NVRAM_PADDR, bip->bi_nvramsize);
 148         }
 149 }
 150
 151 void __init
 152 ep405_init_IRQ(void)
 153 {
 154         int i;
 155
 156         ppc4xx_init_IRQ();
 157
 158         /* Workaround for a bug in the firmware it incorrectly sets
 159            the IRQ polarities for XIRQ0 and XIRQ1 */
 160         mtdcr(DCRN_UIC_PR(DCRN_UIC0_BASE), 0xffffff80); /* set the polarity */
 161         mtdcr(DCRN_UIC_SR(DCRN_UIC0_BASE), 0x00000060); /* clear bogus interrupts */
 162
 163         /* Activate the XIRQs from the CPLD */
 164         writeb(0xf0, ep405_bcsr+10);
 165
 166         /* Set up IRQ routing */
 167         for (i = 0; i < ARRAY_SIZE(ep405_devtable); i++) {
 168                 if ( (ep405_devtable[i].irq >= 25)
 169                      && (ep405_devtable[i].irq) <= 31) {
 170                         writeb(ep405_devtable[i].cpld_xirq_select, ep405_bcsr+5);
 171                         writeb(ep405_devtable[i].irq - 25, ep405_bcsr+6);
 172                 }
 173         }
 174 }
 175
 176 void __init
 177 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 178               unsigned long r6, unsigned long r7)
 179 {
 180         ppc4xx_init(r3, r4, r5, r6, r7);
 181
 182         ppc_md.setup_arch = ep405_setup_arch;
 183         ppc_md.setup_io_mappings = ep405_map_io;
 184         ppc_md.init_IRQ = ep405_init_IRQ;
 185
 186         ppc_md.nvram_read_val = todc_direct_read_val;
 187         ppc_md.nvram_write_val = todc_direct_write_val;
 188
 189         if (__res.bi_nvramsize == 512*1024) {
 190                 ppc_md.time_init = todc_time_init;
 191                 ppc_md.set_rtc_time = todc_set_rtc_time;
 192                 ppc_md.get_rtc_time = todc_get_rtc_time;
 193         } else {
 194                 printk("EP405: NVRTC size is not 512k (not a DS1557).  Not sure what to do with it\n");
 195         }
 196 }