/* * linux/arch/arm/mach-integrator/pci_v3.c * * PCI functions for V3 host PCI bridge * * Copyright (C) 1999 ARM Limited * Copyright (C) 2000-2001 Deep Blue Solutions Ltd * * 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/config.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/ptrace.h> #include <linux/slab.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/init.h> #include <asm/hardware.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/system.h> #include <asm/mach/pci.h> #include <asm/hardware/pci_v3.h> /* * The V3 PCI interface chip in Integrator provides several windows from * local bus memory into the PCI memory areas. Unfortunately, there * are not really enough windows for our usage, therefore we reuse * one of the windows for access to PCI configuration space. The * memory map is as follows: * * Local Bus Memory Usage * * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable * 60000000 - 60FFFFFF PCI IO. 16M * 61000000 - 61FFFFFF PCI Configuration. 16M * * There are three V3 windows, each described by a pair of V3 registers. * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2. * Base0 and Base1 can be used for any type of PCI memory access. Base2 * can be used either for PCI I/O or for I20 accesses. By default, uHAL * uses this only for PCI IO space. * * Normally these spaces are mapped using the following base registers: * * Usage Local Bus Memory Base/Map registers used * * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 * Cfg 61000000 - 61FFFFFF * * This means that I20 and PCI configuration space accesses will fail. * When PCI configuration accesses are needed (via the uHAL PCI * configuration space primitives) we must remap the spaces as follows: * * Usage Local Bus Memory Base/Map registers used * * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1 * * To make this work, the code depends on overlapping windows working. * The V3 chip translates an address by checking its range within * each of the BASE/MAP pairs in turn (in ascending register number * order). It will use the first matching pair. So, for example, * if the same address is mapped by both LB_BASE0/LB_MAP0 and * LB_BASE1/LB_MAP1, the V3 will use the translation from * LB_BASE0/LB_MAP0. * * To allow PCI Configuration space access, the code enlarges the * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can * be remapped for use by configuration cycles. * * At the end of the PCI Configuration space accesses, * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to * reveal the now restored LB_BASE1/LB_MAP1 window. * * NOTE: We do not set up I2O mapping. I suspect that this is only * for an intelligent (target) device. Using I2O disables most of * the mappings into PCI memory. */ // V3 access routines #define v3_writeb(o,v) __raw_writeb(v, PCI_V3_VADDR + (unsigned int)(o)) #define v3_readb(o) (__raw_readb(PCI_V3_VADDR + (unsigned int)(o))) #define v3_writew(o,v) __raw_writew(v, PCI_V3_VADDR + (unsigned int)(o)) #define v3_readw(o) (__raw_readw(PCI_V3_VADDR + (unsigned int)(o))) #define v3_writel(o,v) __raw_writel(v, PCI_V3_VADDR + (unsigned int)(o)) #define v3_readl(o) (__raw_readl(PCI_V3_VADDR + (unsigned int)(o))) /*============================================================================ * * routine: uHALir_PCIMakeConfigAddress() * * parameters: bus = which bus * device = which device * function = which function * offset = configuration space register we are interested in * * description: this routine will generate a platform dependent config * address. * * calls: none * * returns: configuration address to play on the PCI bus * * To generate the appropriate PCI configuration cycles in the PCI * configuration address space, you present the V3 with the following pattern * (which is very nearly a type 1 (except that the lower two bits are 00 and * not 01). In order for this mapping to work you need to set up one of * the local to PCI aperatures to 16Mbytes in length translating to * PCI configuration space starting at 0x0000.0000. * * PCI configuration cycles look like this: * * Type 0: * * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * 31:11 Device select bit. * 10:8 Function number * 7:2 Register number * * Type 1: * * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * 31:24 reserved * 23:16 bus number (8 bits = 128 possible buses) * 15:11 Device number (5 bits) * 10:8 function number * 7:2 register number * */ static DEFINE_SPINLOCK(v3_lock); #define PCI_BUS_NONMEM_START 0x00000000 #define PCI_BUS_NONMEM_SIZE SZ_256M #define PCI_BUS_PREMEM_START PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE #define PCI_BUS_PREMEM_SIZE SZ_256M #if PCI_BUS_NONMEM_START & 0x000fffff #error PCI_BUS_NONMEM_START must be megabyte aligned #endif #if PCI_BUS_PREMEM_START & 0x000fffff #error PCI_BUS_PREMEM_START must be megabyte aligned #endif #undef V3_LB_BASE_PREFETCH #define V3_LB_BASE_PREFETCH 0 static unsigned long v3_open_config_window(struct pci_bus *bus, unsigned int devfn, int offset) { unsigned int address, mapaddress, busnr; busnr = bus->number; /* * Trap out illegal values */ if (offset > 255) BUG(); if (busnr > 255) BUG(); if (devfn > 255) BUG(); if (busnr == 0) { int slot = PCI_SLOT(devfn); /* * local bus segment so need a type 0 config cycle * * build the PCI configuration "address" with one-hot in * A31-A11 * * mapaddress: * 3:1 = config cycle (101) * 0 = PCI A1 & A0 are 0 (0) */ address = PCI_FUNC(devfn) << 8; mapaddress = V3_LB_MAP_TYPE_CONFIG; if (slot > 12) /* * high order bits are handled by the MAP register */ mapaddress |= 1 << (slot - 5); else /* * low order bits handled directly in the address */ address |= 1 << (slot + 11); } else { /* * not the local bus segment so need a type 1 config cycle * * address: * 23:16 = bus number * 15:11 = slot number (7:3 of devfn) * 10:8 = func number (2:0 of devfn) * * mapaddress: * 3:1 = config cycle (101) * 0 = PCI A1 & A0 from host bus (1) */ mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN; address = (busnr << 16) | (devfn << 8); } /* * Set up base0 to see all 512Mbytes of memory space (not * prefetchable), this frees up base1 for re-use by * configuration memory */ v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) | V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE); /* * Set up base1/map1 to point into configuration space. */ v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_CONFIG_BASE) | V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE); v3_writew(V3_LB_MAP1, mapaddress); return PCI_CONFIG_VADDR + address + offset; } static void v3_close_config_window(void) { /* * Reassign base1 for use by prefetchable PCI memory */ v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) | V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH | V3_LB_BASE_ENABLE); v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) | V3_LB_MAP_TYPE_MEM_MULTIPLE); /* * And shrink base0 back to a 256M window (NOTE: MAP0 already correct) */ v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) | V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE); } static int v3_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { unsigned long addr; unsigned long flags; u32 v; spin_lock_irqsave(&v3_lock, flags); addr = v3_open_config_window(bus, devfn, where); switch (size) { case 1: v = __raw_readb(addr); break; case 2: v = __raw_readw(addr); break; default: v = __raw_readl(addr); break; } v3_close_config_window(); spin_unlock_irqrestore(&v3_lock, flags); *val = v; return PCIBIOS_SUCCESSFUL; } static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { unsigned long addr; unsigned long flags; spin_lock_irqsave(&v3_lock, flags); addr = v3_open_config_window(bus, devfn, where); switch (size) { case 1: __raw_writeb((u8)val, addr); __raw_readb(addr); break; case 2: __raw_writew((u16)val, addr); __raw_readw(addr); break; case 4: __raw_writel(val, addr); __raw_readl(addr); break; } v3_close_config_window(); spin_unlock_irqrestore(&v3_lock, flags); return PCIBIOS_SUCCESSFUL; } static struct pci_ops pci_v3_ops = { .read = v3_read_config, .write = v3_write_config, }; static struct resource non_mem = { .name = "PCI non-prefetchable", .start = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START, .end = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE - 1, .flags = IORESOURCE_MEM, }; static struct resource pre_mem = { .name = "PCI prefetchable", .start = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START, .end = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START + PCI_BUS_PREMEM_SIZE - 1, .flags = IORESOURCE_MEM | IORESOURCE_PREFETCH, }; static int __init pci_v3_setup_resources(struct resource **resource) { if (request_resource(&iomem_resource, &non_mem)) { printk(KERN_ERR "PCI: unable to allocate non-prefetchable " "memory region\n"); return -EBUSY; } if (request_resource(&iomem_resource, &pre_mem)) { release_resource(&non_mem); printk(KERN_ERR "PCI: unable to allocate prefetchable " "memory region\n"); return -EBUSY; } /* * bus->resource[0] is the IO resource for this bus * bus->resource[1] is the mem resource for this bus * bus->resource[2] is the prefetch mem resource for this bus */ resource[0] = &ioport_resource; resource[1] = &non_mem; resource[2] = &pre_mem; return 1; } /* * These don't seem to be implemented on the Integrator I have, which * means I can't get additional information on the reason for the pm2fb * problems. I suppose I'll just have to mind-meld with the machine. ;) */ #define SC_PCI (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_PCIENABLE_OFFSET) #define SC_LBFADDR (IO_ADDRESS(INTEGRATOR_SC_BASE) + 0x20) #define SC_LBFCODE (IO_ADDRESS(INTEGRATOR_SC_BASE) + 0x24) static int v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { unsigned long pc = instruction_pointer(regs); unsigned long instr = *(unsigned long *)pc; #if 0 char buf[128]; sprintf(buf, "V3 fault: addr 0x%08lx, FSR 0x%03x, PC 0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n", addr, fsr, pc, instr, __raw_readl(SC_LBFADDR), __raw_readl(SC_LBFCODE) & 255, v3_readb(V3_LB_ISTAT)); printk(KERN_DEBUG "%s", buf); printascii(buf); #endif v3_writeb(V3_LB_ISTAT, 0); __raw_writel(3, SC_PCI); /* * If the instruction being executed was a read, * make it look like it read all-ones. */ if ((instr & 0x0c100000) == 0x04100000) { int reg = (instr >> 12) & 15; unsigned long val; if (instr & 0x00400000) val = 255; else val = -1; regs->uregs[reg] = val; regs->ARM_pc += 4; return 0; } if ((instr & 0x0e100090) == 0x00100090) { int reg = (instr >> 12) & 15; regs->uregs[reg] = -1; regs->ARM_pc += 4; return 0; } return 1; } static irqreturn_t v3_irq(int irq, void *devid, struct pt_regs *regs) { #ifdef CONFIG_DEBUG_LL unsigned long pc = instruction_pointer(regs); unsigned long instr = *(unsigned long *)pc; char buf[128]; sprintf(buf, "V3 int %d: pc=0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n", irq, pc, instr, __raw_readl(SC_LBFADDR), __raw_readl(SC_LBFCODE) & 255, v3_readb(V3_LB_ISTAT)); printascii(buf); #endif v3_writew(V3_PCI_STAT, 0xf000); v3_writeb(V3_LB_ISTAT, 0); __raw_writel(3, SC_PCI); #ifdef CONFIG_DEBUG_LL /* * If the instruction being executed was a read, * make it look like it read all-ones. */ if ((instr & 0x0c100000) == 0x04100000) { int reg = (instr >> 16) & 15; sprintf(buf, " reg%d = %08lx\n", reg, regs->uregs[reg]); printascii(buf); } #endif return IRQ_HANDLED; } int __init pci_v3_setup(int nr, struct pci_sys_data *sys) { int ret = 0; if (nr == 0) { sys->mem_offset = PHYS_PCI_MEM_BASE; ret = pci_v3_setup_resources(sys->resource); } return ret; } struct pci_bus *pci_v3_scan_bus(int nr, struct pci_sys_data *sys) { return pci_scan_bus(sys->busnr, &pci_v3_ops, sys); } /* * V3_LB_BASE? - local bus address * V3_LB_MAP? - pci bus address */ void __init pci_v3_preinit(void) { unsigned long flags; unsigned int temp; int ret; /* * Hook in our fault handler for PCI errors */ hook_fault_code(4, v3_pci_fault, SIGBUS, "external abort on linefetch"); hook_fault_code(6, v3_pci_fault, SIGBUS, "external abort on linefetch"); hook_fault_code(8, v3_pci_fault, SIGBUS, "external abort on non-linefetch"); hook_fault_code(10, v3_pci_fault, SIGBUS, "external abort on non-linefetch"); spin_lock_irqsave(&v3_lock, flags); /* * Unlock V3 registers, but only if they were previously locked. */ if (v3_readw(V3_SYSTEM) & V3_SYSTEM_M_LOCK) v3_writew(V3_SYSTEM, 0xa05f); /* * Setup window 0 - PCI non-prefetchable memory * Local: 0x40000000 Bus: 0x00000000 Size: 256MB */ v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) | V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE); v3_writew(V3_LB_MAP0, v3_addr_to_lb_map(PCI_BUS_NONMEM_START) | V3_LB_MAP_TYPE_MEM); /* * Setup window 1 - PCI prefetchable memory * Local: 0x50000000 Bus: 0x10000000 Size: 256MB */ v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) | V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH | V3_LB_BASE_ENABLE); v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) | V3_LB_MAP_TYPE_MEM_MULTIPLE); /* * Setup window 2 - PCI IO */ v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(PHYS_PCI_IO_BASE) | V3_LB_BASE_ENABLE); v3_writew(V3_LB_MAP2, v3_addr_to_lb_map2(0)); /* * Disable PCI to host IO cycles */ temp = v3_readw(V3_PCI_CFG) & ~V3_PCI_CFG_M_I2O_EN; temp |= V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS; v3_writew(V3_PCI_CFG, temp); printk(KERN_DEBUG "FIFO_CFG: %04x FIFO_PRIO: %04x\n", v3_readw(V3_FIFO_CFG), v3_readw(V3_FIFO_PRIORITY)); /* * Set the V3 FIFO such that writes have higher priority than * reads, and local bus write causes local bus read fifo flush. * Same for PCI. */ v3_writew(V3_FIFO_PRIORITY, 0x0a0a); /* * Re-lock the system register. */ temp = v3_readw(V3_SYSTEM) | V3_SYSTEM_M_LOCK; v3_writew(V3_SYSTEM, temp); /* * Clear any error conditions, and enable write errors. */ v3_writeb(V3_LB_ISTAT, 0); v3_writew(V3_LB_CFG, v3_readw(V3_LB_CFG) | (1 << 10)); v3_writeb(V3_LB_IMASK, 0x28); __raw_writel(3, SC_PCI); /* * Grab the PCI error interrupt. */ ret = request_irq(IRQ_AP_V3INT, v3_irq, 0, "V3", NULL); if (ret) printk(KERN_ERR "PCI: unable to grab PCI error " "interrupt: %d\n", ret); spin_unlock_irqrestore(&v3_lock, flags); } void __init pci_v3_postinit(void) { unsigned int pci_cmd; pci_cmd = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE; v3_writew(V3_PCI_CMD, pci_cmd); v3_writeb(V3_LB_ISTAT, ~0x40); v3_writeb(V3_LB_IMASK, 0x68); #if 0 ret = request_irq(IRQ_AP_LBUSTIMEOUT, lb_timeout, 0, "bus timeout", NULL); if (ret) printk(KERN_ERR "PCI: unable to grab local bus timeout " "interrupt: %d\n", ret); #endif }