/* * * (C) Copyright 2003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2004 Red Hat, Inc. * * 2005 (c) MontaVista Software, Inc. * Vitaly Bordug <vbordug@ru.mvista.com> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <asm/byteorder.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> #include <asm/machdep.h> #include <asm/pci-bridge.h> #include <asm/immap_cpm2.h> #include <asm/mpc8260.h> #include <asm/cpm2.h> #include "m82xx_pci.h" /* * Interrupt routing */ static inline int pq2pci_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin) { static char pci_irq_table[][4] = /* * PCI IDSEL/INTPIN->INTLINE * A B C D */ { { PIRQA, PIRQB, PIRQC, PIRQD }, /* IDSEL 22 - PCI slot 0 */ { PIRQD, PIRQA, PIRQB, PIRQC }, /* IDSEL 23 - PCI slot 1 */ { PIRQC, PIRQD, PIRQA, PIRQB }, /* IDSEL 24 - PCI slot 2 */ }; const long min_idsel = 22, max_idsel = 24, irqs_per_slot = 4; return PCI_IRQ_TABLE_LOOKUP; } static void pq2pci_mask_irq(unsigned int irq) { int bit = irq - NR_CPM_INTS; *(volatile unsigned long *) PCI_INT_MASK_REG |= (1 << (31 - bit)); return; } static void pq2pci_unmask_irq(unsigned int irq) { int bit = irq - NR_CPM_INTS; *(volatile unsigned long *) PCI_INT_MASK_REG &= ~(1 << (31 - bit)); return; } static void pq2pci_mask_and_ack(unsigned int irq) { int bit = irq - NR_CPM_INTS; *(volatile unsigned long *) PCI_INT_MASK_REG |= (1 << (31 - bit)); return; } static void pq2pci_end_irq(unsigned int irq) { int bit = irq - NR_CPM_INTS; *(volatile unsigned long *) PCI_INT_MASK_REG &= ~(1 << (31 - bit)); return; } struct hw_interrupt_type pq2pci_ic = { "PQ2 PCI", NULL, NULL, pq2pci_unmask_irq, pq2pci_mask_irq, pq2pci_mask_and_ack, pq2pci_end_irq, 0 }; static irqreturn_t pq2pci_irq_demux(int irq, void *dev_id, struct pt_regs *regs) { unsigned long stat, mask, pend; int bit; for(;;) { stat = *(volatile unsigned long *) PCI_INT_STAT_REG; mask = *(volatile unsigned long *) PCI_INT_MASK_REG; pend = stat & ~mask & 0xf0000000; if (!pend) break; for (bit = 0; pend != 0; ++bit, pend <<= 1) { if (pend & 0x80000000) __do_IRQ(NR_CPM_INTS + bit, regs); } } return IRQ_HANDLED; } static struct irqaction pq2pci_irqaction = { .handler = pq2pci_irq_demux, .flags = SA_INTERRUPT, .mask = CPU_MASK_NONE, .name = "PQ2 PCI cascade", }; void pq2pci_init_irq(void) { int irq; volatile cpm2_map_t *immap = cpm2_immr; #if defined CONFIG_ADS8272 /* configure chip select for PCI interrupt controller */ immap->im_memctl.memc_br3 = PCI_INT_STAT_REG | 0x00001801; immap->im_memctl.memc_or3 = 0xffff8010; #elif defined CONFIG_PQ2FADS immap->im_memctl.memc_br8 = PCI_INT_STAT_REG | 0x00001801; immap->im_memctl.memc_or8 = 0xffff8010; #endif for (irq = NR_CPM_INTS; irq < NR_CPM_INTS + 4; irq++) irq_desc[irq].handler = &pq2pci_ic; /* make PCI IRQ level sensitive */ immap->im_intctl.ic_siexr &= ~(1 << (14 - (PCI_INT_TO_SIU - SIU_INT_IRQ1))); /* mask all PCI interrupts */ *(volatile unsigned long *) PCI_INT_MASK_REG |= 0xfff00000; /* install the demultiplexer for the PCI cascade interrupt */ setup_irq(PCI_INT_TO_SIU, &pq2pci_irqaction); return; } static int pq2pci_exclude_device(u_char bus, u_char devfn) { return PCIBIOS_SUCCESSFUL; } /* PCI bus configuration registers. */ static void pq2ads_setup_pci(struct pci_controller *hose) { __u32 val; volatile cpm2_map_t *immap = cpm2_immr; bd_t* binfo = (bd_t*) __res; u32 sccr = immap->im_clkrst.car_sccr; uint pci_div,freq,time; /* PCI int lowest prio */ /* Each 4 bits is a device bus request and the MS 4bits is highest priority */ /* Bus 4bit value --- ---------- CPM high 0b0000 CPM middle 0b0001 CPM low 0b0010 PCI reguest 0b0011 Reserved 0b0100 Reserved 0b0101 Internal Core 0b0110 External Master 1 0b0111 External Master 2 0b1000 External Master 3 0b1001 The rest are reserved */ immap->im_siu_conf.siu_82xx.sc_ppc_alrh = 0x61207893; /* park bus on core */ immap->im_siu_conf.siu_82xx.sc_ppc_acr = PPC_ACR_BUS_PARK_CORE; /* * Set up master windows that allow the CPU to access PCI space. These * windows are set up using the two SIU PCIBR registers. */ immap->im_memctl.memc_pcimsk0 = M82xx_PCI_PRIM_WND_SIZE; immap->im_memctl.memc_pcibr0 = M82xx_PCI_PRIM_WND_BASE | PCIBR_ENABLE; #ifdef M82xx_PCI_SEC_WND_SIZE immap->im_memctl.memc_pcimsk1 = M82xx_PCI_SEC_WND_SIZE; immap->im_memctl.memc_pcibr1 = M82xx_PCI_SEC_WND_BASE | PCIBR_ENABLE; #endif #if defined CONFIG_ADS8272 immap->im_siu_conf.siu_82xx.sc_siumcr = (immap->im_siu_conf.siu_82xx.sc_siumcr & ~(SIUMCR_BBD | SIUMCR_ESE | SIUMCR_PBSE | SIUMCR_CDIS | SIUMCR_DPPC11 | SIUMCR_L2CPC11 | SIUMCR_LBPC11 | SIUMCR_APPC11 | SIUMCR_CS10PC11 | SIUMCR_BCTLC11 | SIUMCR_MMR11)) | SIUMCR_DPPC11 | SIUMCR_L2CPC01 | SIUMCR_LBPC00 | SIUMCR_APPC10 | SIUMCR_CS10PC00 | SIUMCR_BCTLC00 | SIUMCR_MMR11 ; #elif defined CONFIG_PQ2FADS /* * Setting required to enable IRQ1-IRQ7 (SIUMCR [DPPC]), * and local bus for PCI (SIUMCR [LBPC]). */ immap->im_siu_conf.siu_82xx.sc_siumcr = (immap->im_siu_conf.siu_82xx.sc_siumcr & ~(SIUMCR_L2CPC11 | SIUMCR_LBPC11 | SIUMCR_CS10PC11 | SIUMCR_APPC11) | SIUMCR_BBD | SIUMCR_LBPC01 | SIUMCR_DPPC11 | SIUMCR_APPC10); #endif /* Enable PCI */ immap->im_pci.pci_gcr = cpu_to_le32(PCIGCR_PCI_BUS_EN); pci_div = ( (sccr & SCCR_PCI_MODCK) ? 2 : 1) * ( ( (sccr & SCCR_PCIDF_MSK) >> SCCR_PCIDF_SHIFT) + 1); freq = (uint)((2*binfo->bi_cpmfreq)/(pci_div)); time = (int)666666/freq; /* due to PCI Local Bus spec, some devices needs to wait such a long time after RST deassertion. More specifically, 0.508s for 66MHz & twice more for 33 */ printk("%s: The PCI bus is %d Mhz.\nWaiting %s after deasserting RST...\n",__FILE__,freq, (time==1) ? "0.5 seconds":"1 second" ); { int i; for(i=0;i<(500*time);i++) udelay(1000); } /* setup ATU registers */ immap->im_pci.pci_pocmr0 = cpu_to_le32(POCMR_ENABLE | POCMR_PCI_IO | ((~(M82xx_PCI_IO_SIZE - 1U)) >> POTA_ADDR_SHIFT)); immap->im_pci.pci_potar0 = cpu_to_le32(M82xx_PCI_LOWER_IO >> POTA_ADDR_SHIFT); immap->im_pci.pci_pobar0 = cpu_to_le32(M82xx_PCI_IO_BASE >> POTA_ADDR_SHIFT); /* Set-up non-prefetchable window */ immap->im_pci.pci_pocmr1 = cpu_to_le32(POCMR_ENABLE | ((~(M82xx_PCI_MMIO_SIZE-1U)) >> POTA_ADDR_SHIFT)); immap->im_pci.pci_potar1 = cpu_to_le32(M82xx_PCI_LOWER_MMIO >> POTA_ADDR_SHIFT); immap->im_pci.pci_pobar1 = cpu_to_le32((M82xx_PCI_LOWER_MMIO - M82xx_PCI_MMIO_OFFSET) >> POTA_ADDR_SHIFT); /* Set-up prefetchable window */ immap->im_pci.pci_pocmr2 = cpu_to_le32(POCMR_ENABLE |POCMR_PREFETCH_EN | (~(M82xx_PCI_MEM_SIZE-1U) >> POTA_ADDR_SHIFT)); immap->im_pci.pci_potar2 = cpu_to_le32(M82xx_PCI_LOWER_MEM >> POTA_ADDR_SHIFT); immap->im_pci.pci_pobar2 = cpu_to_le32((M82xx_PCI_LOWER_MEM - M82xx_PCI_MEM_OFFSET) >> POTA_ADDR_SHIFT); /* Inbound transactions from PCI memory space */ immap->im_pci.pci_picmr0 = cpu_to_le32(PICMR_ENABLE | PICMR_PREFETCH_EN | ((~(M82xx_PCI_SLAVE_MEM_SIZE-1U)) >> PITA_ADDR_SHIFT)); immap->im_pci.pci_pibar0 = cpu_to_le32(M82xx_PCI_SLAVE_MEM_BUS >> PITA_ADDR_SHIFT); immap->im_pci.pci_pitar0 = cpu_to_le32(M82xx_PCI_SLAVE_MEM_LOCAL>> PITA_ADDR_SHIFT); #if defined CONFIG_ADS8272 /* PCI int highest prio */ immap->im_siu_conf.siu_82xx.sc_ppc_alrh = 0x01236745; #elif defined CONFIG_PQ2FADS immap->im_siu_conf.siu_82xx.sc_ppc_alrh = 0x03124567; #endif /* park bus on PCI */ immap->im_siu_conf.siu_82xx.sc_ppc_acr = PPC_ACR_BUS_PARK_PCI; /* Enable bus mastering and inbound memory transactions */ early_read_config_dword(hose, hose->first_busno, 0, PCI_COMMAND, &val); val &= 0xffff0000; val |= PCI_COMMAND_MEMORY|PCI_COMMAND_MASTER; early_write_config_dword(hose, hose->first_busno, 0, PCI_COMMAND, val); } void __init pq2_find_bridges(void) { extern int pci_assign_all_buses; struct pci_controller * hose; int host_bridge; pci_assign_all_buses = 1; hose = pcibios_alloc_controller(); if (!hose) return; ppc_md.pci_swizzle = common_swizzle; hose->first_busno = 0; hose->bus_offset = 0; hose->last_busno = 0xff; #ifdef CONFIG_ADS8272 hose->set_cfg_type = 1; #endif setup_m8260_indirect_pci(hose, (unsigned long)&cpm2_immr->im_pci.pci_cfg_addr, (unsigned long)&cpm2_immr->im_pci.pci_cfg_data); /* Make sure it is a supported bridge */ early_read_config_dword(hose, 0, PCI_DEVFN(0,0), PCI_VENDOR_ID, &host_bridge); switch (host_bridge) { case PCI_DEVICE_ID_MPC8265: break; case PCI_DEVICE_ID_MPC8272: break; default: printk("Attempting to use unrecognized host bridge ID" " 0x%08x.\n", host_bridge); break; } pq2ads_setup_pci(hose); hose->io_space.start = M82xx_PCI_LOWER_IO; hose->io_space.end = M82xx_PCI_UPPER_IO; hose->mem_space.start = M82xx_PCI_LOWER_MEM; hose->mem_space.end = M82xx_PCI_UPPER_MMIO; hose->pci_mem_offset = M82xx_PCI_MEM_OFFSET; isa_io_base = (unsigned long) ioremap(M82xx_PCI_IO_BASE, M82xx_PCI_IO_SIZE); hose->io_base_virt = (void *) isa_io_base; /* setup resources */ pci_init_resource(&hose->mem_resources[0], M82xx_PCI_LOWER_MEM, M82xx_PCI_UPPER_MEM, IORESOURCE_MEM|IORESOURCE_PREFETCH, "PCI prefetchable memory"); pci_init_resource(&hose->mem_resources[1], M82xx_PCI_LOWER_MMIO, M82xx_PCI_UPPER_MMIO, IORESOURCE_MEM, "PCI memory"); pci_init_resource(&hose->io_resource, M82xx_PCI_LOWER_IO, M82xx_PCI_UPPER_IO, IORESOURCE_IO | 1, "PCI I/O"); ppc_md.pci_exclude_device = pq2pci_exclude_device; hose->last_busno = pciauto_bus_scan(hose, hose->first_busno); ppc_md.pci_map_irq = pq2pci_map_irq; ppc_md.pcibios_fixup = NULL; ppc_md.pcibios_fixup_bus = NULL; }