aboutsummaryrefslogtreecommitdiff
path: root/arch/sh64/kernel/pci_sh5.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh64/kernel/pci_sh5.c')
-rw-r--r--arch/sh64/kernel/pci_sh5.c541
1 files changed, 541 insertions, 0 deletions
diff --git a/arch/sh64/kernel/pci_sh5.c b/arch/sh64/kernel/pci_sh5.c
new file mode 100644
index 000000000000..6197879e8578
--- /dev/null
+++ b/arch/sh64/kernel/pci_sh5.c
@@ -0,0 +1,541 @@
+/*
+ * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
+ * Copyright (C) 2003, 2004 Paul Mundt
+ * Copyright (C) 2004 Richard Curnow
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License. See linux/COPYING for more information.
+ *
+ * Support functions for the SH5 PCI hardware.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/rwsem.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <asm/pci.h>
+#include <linux/irq.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include "pci_sh5.h"
+
+static unsigned long pcicr_virt;
+unsigned long pciio_virt;
+
+static void __init pci_fixup_ide_bases(struct pci_dev *d)
+{
+ int i;
+
+ /*
+ * PCI IDE controllers use non-standard I/O port decoding, respect it.
+ */
+ if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
+ return;
+ printk("PCI: IDE base address fixup for %s\n", pci_name(d));
+ for(i=0; i<4; i++) {
+ struct resource *r = &d->resource[i];
+ if ((r->start & ~0x80) == 0x374) {
+ r->start |= 2;
+ r->end = r->start;
+ }
+ }
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
+
+char * __init pcibios_setup(char *str)
+{
+ return str;
+}
+
+/* Rounds a number UP to the nearest power of two. Used for
+ * sizing the PCI window.
+ */
+static u32 __init r2p2(u32 num)
+{
+ int i = 31;
+ u32 tmp = num;
+
+ if (num == 0)
+ return 0;
+
+ do {
+ if (tmp & (1 << 31))
+ break;
+ i--;
+ tmp <<= 1;
+ } while (i >= 0);
+
+ tmp = 1 << i;
+ /* If the original number isn't a power of 2, round it up */
+ if (tmp != num)
+ tmp <<= 1;
+
+ return tmp;
+}
+
+extern unsigned long long memory_start, memory_end;
+
+int __init sh5pci_init(unsigned memStart, unsigned memSize)
+{
+ u32 lsr0;
+ u32 uval;
+
+ pcicr_virt = onchip_remap(SH5PCI_ICR_BASE, 1024, "PCICR");
+ if (!pcicr_virt) {
+ panic("Unable to remap PCICR\n");
+ }
+
+ pciio_virt = onchip_remap(SH5PCI_IO_BASE, 0x10000, "PCIIO");
+ if (!pciio_virt) {
+ panic("Unable to remap PCIIO\n");
+ }
+
+ pr_debug("Register base addres is 0x%08lx\n", pcicr_virt);
+
+ /* Clear snoop registers */
+ SH5PCI_WRITE(CSCR0, 0);
+ SH5PCI_WRITE(CSCR1, 0);
+
+ pr_debug("Wrote to reg\n");
+
+ /* Switch off interrupts */
+ SH5PCI_WRITE(INTM, 0);
+ SH5PCI_WRITE(AINTM, 0);
+ SH5PCI_WRITE(PINTM, 0);
+
+ /* Set bus active, take it out of reset */
+ uval = SH5PCI_READ(CR);
+
+ /* Set command Register */
+ SH5PCI_WRITE(CR, uval | CR_LOCK_MASK | CR_CFINT| CR_FTO | CR_PFE | CR_PFCS | CR_BMAM);
+
+ uval=SH5PCI_READ(CR);
+ pr_debug("CR is actually 0x%08x\n",uval);
+
+ /* Allow it to be a master */
+ /* NB - WE DISABLE I/O ACCESS to stop overlap */
+ /* set WAIT bit to enable stepping, an attempt to improve stability */
+ SH5PCI_WRITE_SHORT(CSR_CMD,
+ PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_WAIT);
+
+ /*
+ ** Set translation mapping memory in order to convert the address
+ ** used for the main bus, to the PCI internal address.
+ */
+ SH5PCI_WRITE(MBR,0x40000000);
+
+ /* Always set the max size 512M */
+ SH5PCI_WRITE(MBMR, PCISH5_MEM_SIZCONV(512*1024*1024));
+
+ /*
+ ** I/O addresses are mapped at internal PCI specific address
+ ** as is described into the configuration bridge table.
+ ** These are changed to 0, to allow cards that have legacy
+ ** io such as vga to function correctly. We set the SH5 IOBAR to
+ ** 256K, which is a bit big as we can only have 64K of address space
+ */
+
+ SH5PCI_WRITE(IOBR,0x0);
+
+ pr_debug("PCI:Writing 0x%08x to IOBR\n",0);
+
+ /* Set up a 256K window. Totally pointless waste of address space */
+ SH5PCI_WRITE(IOBMR,0);
+ pr_debug("PCI:Writing 0x%08x to IOBMR\n",0);
+
+ /* The SH5 has a HUGE 256K I/O region, which breaks the PCI spec. Ideally,
+ * we would want to map the I/O region somewhere, but it is so big this is not
+ * that easy!
+ */
+ SH5PCI_WRITE(CSR_IBAR0,~0);
+ /* Set memory size value */
+ memSize = memory_end - memory_start;
+
+ /* Now we set up the mbars so the PCI bus can see the memory of the machine */
+ if (memSize < (1024 * 1024)) {
+ printk(KERN_ERR "PCISH5: Ridiculous memory size of 0x%x?\n", memSize);
+ return -EINVAL;
+ }
+
+ /* Set LSR 0 */
+ lsr0 = (memSize > (512 * 1024 * 1024)) ? 0x1ff00001 : ((r2p2(memSize) - 0x100000) | 0x1);
+ SH5PCI_WRITE(LSR0, lsr0);
+
+ pr_debug("PCI:Writing 0x%08x to LSR0\n",lsr0);
+
+ /* Set MBAR 0 */
+ SH5PCI_WRITE(CSR_MBAR0, memory_start);
+ SH5PCI_WRITE(LAR0, memory_start);
+
+ SH5PCI_WRITE(CSR_MBAR1,0);
+ SH5PCI_WRITE(LAR1,0);
+ SH5PCI_WRITE(LSR1,0);
+
+ pr_debug("PCI:Writing 0x%08llx to CSR_MBAR0\n",memory_start);
+ pr_debug("PCI:Writing 0x%08llx to LAR0\n",memory_start);
+
+ /* Enable the PCI interrupts on the device */
+ SH5PCI_WRITE(INTM, ~0);
+ SH5PCI_WRITE(AINTM, ~0);
+ SH5PCI_WRITE(PINTM, ~0);
+
+ pr_debug("Switching on all error interrupts\n");
+
+ return(0);
+}
+
+static int sh5pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *val)
+{
+ SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
+
+ switch (size) {
+ case 1:
+ *val = (u8)SH5PCI_READ_BYTE(PDR + (where & 3));
+ break;
+ case 2:
+ *val = (u16)SH5PCI_READ_SHORT(PDR + (where & 2));
+ break;
+ case 4:
+ *val = SH5PCI_READ(PDR);
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int sh5pci_write(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 val)
+{
+ SH5PCI_WRITE(PAR, CONFIG_CMD(bus, devfn, where));
+
+ switch (size) {
+ case 1:
+ SH5PCI_WRITE_BYTE(PDR + (where & 3), (u8)val);
+ break;
+ case 2:
+ SH5PCI_WRITE_SHORT(PDR + (where & 2), (u16)val);
+ break;
+ case 4:
+ SH5PCI_WRITE(PDR, val);
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops pci_config_ops = {
+ .read = sh5pci_read,
+ .write = sh5pci_write,
+};
+
+/* Everything hangs off this */
+static struct pci_bus *pci_root_bus;
+
+
+static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
+{
+ pr_debug("swizzle for dev %d on bus %d slot %d pin is %d\n",
+ dev->devfn,dev->bus->number, PCI_SLOT(dev->devfn),*pin);
+ return PCI_SLOT(dev->devfn);
+}
+
+static inline u8 bridge_swizzle(u8 pin, u8 slot)
+{
+ return (((pin-1) + slot) % 4) + 1;
+}
+
+u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+ if (dev->bus->number != 0) {
+ u8 pin = *pinp;
+ do {
+ pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+ /* Move up the chain of bridges. */
+ dev = dev->bus->self;
+ } while (dev->bus->self);
+ *pinp = pin;
+
+ /* The slot is the slot of the last bridge. */
+ }
+
+ return PCI_SLOT(dev->devfn);
+}
+
+/* This needs to be shunted out of here into the board specific bit */
+
+static int __init map_cayman_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ int result = -1;
+
+ /* The complication here is that the PCI IRQ lines from the Cayman's 2
+ 5V slots get into the CPU via a different path from the IRQ lines
+ from the 3 3.3V slots. Thus, we have to detect whether the card's
+ interrupts go via the 5V or 3.3V path, i.e. the 'bridge swizzling'
+ at the point where we cross from 5V to 3.3V is not the normal case.
+
+ The added complication is that we don't know that the 5V slots are
+ always bus 2, because a card containing a PCI-PCI bridge may be
+ plugged into a 3.3V slot, and this changes the bus numbering.
+
+ Also, the Cayman has an intermediate PCI bus that goes a custom
+ expansion board header (and to the secondary bridge). This bus has
+ never been used in practice.
+
+ The 1ary onboard PCI-PCI bridge is device 3 on bus 0
+ The 2ary onboard PCI-PCI bridge is device 0 on the 2ary bus of the 1ary bridge.
+ */
+
+ struct slot_pin {
+ int slot;
+ int pin;
+ } path[4];
+ int i=0;
+
+ while (dev->bus->number > 0) {
+
+ slot = path[i].slot = PCI_SLOT(dev->devfn);
+ pin = path[i].pin = bridge_swizzle(pin, slot);
+ dev = dev->bus->self;
+ i++;
+ if (i > 3) panic("PCI path to root bus too long!\n");
+ }
+
+ slot = PCI_SLOT(dev->devfn);
+ /* This is the slot on bus 0 through which the device is eventually
+ reachable. */
+
+ /* Now work back up. */
+ if ((slot < 3) || (i == 0)) {
+ /* Bus 0 (incl. PCI-PCI bridge itself) : perform the final
+ swizzle now. */
+ result = IRQ_INTA + bridge_swizzle(pin, slot) - 1;
+ } else {
+ i--;
+ slot = path[i].slot;
+ pin = path[i].pin;
+ if (slot > 0) {
+ panic("PCI expansion bus device found - not handled!\n");
+ } else {
+ if (i > 0) {
+ /* 5V slots */
+ i--;
+ slot = path[i].slot;
+ pin = path[i].pin;
+ /* 'pin' was swizzled earlier wrt slot, don't do it again. */
+ result = IRQ_P2INTA + (pin - 1);
+ } else {
+ /* IRQ for 2ary PCI-PCI bridge : unused */
+ result = -1;
+ }
+ }
+ }
+
+ return result;
+}
+
+irqreturn_t pcish5_err_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ unsigned pci_int, pci_air, pci_cir, pci_aint;
+
+ pci_int = SH5PCI_READ(INT);
+ pci_cir = SH5PCI_READ(CIR);
+ pci_air = SH5PCI_READ(AIR);
+
+ if (pci_int) {
+ printk("PCI INTERRUPT (at %08llx)!\n", regs->pc);
+ printk("PCI INT -> 0x%x\n", pci_int & 0xffff);
+ printk("PCI AIR -> 0x%x\n", pci_air);
+ printk("PCI CIR -> 0x%x\n", pci_cir);
+ SH5PCI_WRITE(INT, ~0);
+ }
+
+ pci_aint = SH5PCI_READ(AINT);
+ if (pci_aint) {
+ printk("PCI ARB INTERRUPT!\n");
+ printk("PCI AINT -> 0x%x\n", pci_aint);
+ printk("PCI AIR -> 0x%x\n", pci_air);
+ printk("PCI CIR -> 0x%x\n", pci_cir);
+ SH5PCI_WRITE(AINT, ~0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+irqreturn_t pcish5_serr_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ printk("SERR IRQ\n");
+
+ return IRQ_NONE;
+}
+
+#define ROUND_UP(x, a) (((x) + (a) - 1) & ~((a) - 1))
+
+static void __init
+pcibios_size_bridge(struct pci_bus *bus, struct resource *ior,
+ struct resource *memr)
+{
+ struct resource io_res, mem_res;
+ struct pci_dev *dev;
+ struct pci_dev *bridge = bus->self;
+ struct list_head *ln;
+
+ if (!bridge)
+ return; /* host bridge, nothing to do */
+
+ /* set reasonable default locations for pcibios_align_resource */
+ io_res.start = PCIBIOS_MIN_IO;
+ mem_res.start = PCIBIOS_MIN_MEM;
+
+ io_res.end = io_res.start;
+ mem_res.end = mem_res.start;
+
+ /* Collect information about how our direct children are layed out. */
+ for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
+ int i;
+ dev = pci_dev_b(ln);
+
+ /* Skip bridges for now */
+ if (dev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
+ continue;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ struct resource res;
+ unsigned long size;
+
+ memcpy(&res, &dev->resource[i], sizeof(res));
+ size = res.end - res.start + 1;
+
+ if (res.flags & IORESOURCE_IO) {
+ res.start = io_res.end;
+ pcibios_align_resource(dev, &res, size, 0);
+ io_res.end = res.start + size;
+ } else if (res.flags & IORESOURCE_MEM) {
+ res.start = mem_res.end;
+ pcibios_align_resource(dev, &res, size, 0);
+ mem_res.end = res.start + size;
+ }
+ }
+ }
+
+ /* And for all of the subordinate busses. */
+ for (ln=bus->children.next; ln != &bus->children; ln=ln->next)
+ pcibios_size_bridge(pci_bus_b(ln), &io_res, &mem_res);
+
+ /* turn the ending locations into sizes (subtract start) */
+ io_res.end -= io_res.start;
+ mem_res.end -= mem_res.start;
+
+ /* Align the sizes up by bridge rules */
+ io_res.end = ROUND_UP(io_res.end, 4*1024) - 1;
+ mem_res.end = ROUND_UP(mem_res.end, 1*1024*1024) - 1;
+
+ /* Adjust the bridge's allocation requirements */
+ bridge->resource[0].end = bridge->resource[0].start + io_res.end;
+ bridge->resource[1].end = bridge->resource[1].start + mem_res.end;
+
+ bridge->resource[PCI_BRIDGE_RESOURCES].end =
+ bridge->resource[PCI_BRIDGE_RESOURCES].start + io_res.end;
+ bridge->resource[PCI_BRIDGE_RESOURCES+1].end =
+ bridge->resource[PCI_BRIDGE_RESOURCES+1].start + mem_res.end;
+
+ /* adjust parent's resource requirements */
+ if (ior) {
+ ior->end = ROUND_UP(ior->end, 4*1024);
+ ior->end += io_res.end;
+ }
+
+ if (memr) {
+ memr->end = ROUND_UP(memr->end, 1*1024*1024);
+ memr->end += mem_res.end;
+ }
+}
+
+#undef ROUND_UP
+
+static void __init pcibios_size_bridges(void)
+{
+ struct resource io_res, mem_res;
+
+ memset(&io_res, 0, sizeof(io_res));
+ memset(&mem_res, 0, sizeof(mem_res));
+
+ pcibios_size_bridge(pci_root_bus, &io_res, &mem_res);
+}
+
+static int __init pcibios_init(void)
+{
+ if (request_irq(IRQ_ERR, pcish5_err_irq,
+ SA_INTERRUPT, "PCI Error",NULL) < 0) {
+ printk(KERN_ERR "PCISH5: Cannot hook PCI_PERR interrupt\n");
+ return -EINVAL;
+ }
+
+ if (request_irq(IRQ_SERR, pcish5_serr_irq,
+ SA_INTERRUPT, "PCI SERR interrupt", NULL) < 0) {
+ printk(KERN_ERR "PCISH5: Cannot hook PCI_SERR interrupt\n");
+ return -EINVAL;
+ }
+
+ /* The pci subsytem needs to know where memory is and how much
+ * of it there is. I've simply made these globals. A better mechanism
+ * is probably needed.
+ */
+ sh5pci_init(__pa(memory_start),
+ __pa(memory_end) - __pa(memory_start));
+
+ pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
+ pcibios_size_bridges();
+ pci_assign_unassigned_resources();
+ pci_fixup_irqs(no_swizzle, map_cayman_irq);
+
+ return 0;
+}
+
+subsys_initcall(pcibios_init);
+
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+ struct pci_dev *dev = bus->self;
+ int i;
+
+#if 1
+ if(dev) {
+ for(i=0; i<3; i++) {
+ bus->resource[i] =
+ &dev->resource[PCI_BRIDGE_RESOURCES+i];
+ bus->resource[i]->name = bus->name;
+ }
+ bus->resource[0]->flags |= IORESOURCE_IO;
+ bus->resource[1]->flags |= IORESOURCE_MEM;
+
+ /* For now, propagate host limits to the bus;
+ * we'll adjust them later. */
+
+#if 1
+ bus->resource[0]->end = 64*1024 - 1 ;
+ bus->resource[1]->end = PCIBIOS_MIN_MEM+(256*1024*1024)-1;
+ bus->resource[0]->start = PCIBIOS_MIN_IO;
+ bus->resource[1]->start = PCIBIOS_MIN_MEM;
+#else
+ bus->resource[0]->end = 0
+ bus->resource[1]->end = 0
+ bus->resource[0]->start =0
+ bus->resource[1]->start = 0;
+#endif
+ /* Turn off downstream PF memory address range by default */
+ bus->resource[2]->start = 1024*1024;
+ bus->resource[2]->end = bus->resource[2]->start - 1;
+ }
+#endif
+
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 02:12:31 +0000