aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/boards/overdrive/galileo.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/boards/overdrive/galileo.c')
-rw-r--r--arch/sh/boards/overdrive/galileo.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/arch/sh/boards/overdrive/galileo.c b/arch/sh/boards/overdrive/galileo.c
new file mode 100644
index 000000000000..276fa11ee4ce
--- /dev/null
+++ b/arch/sh/boards/overdrive/galileo.c
@@ -0,0 +1,588 @@
+/*
+ * Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License. See linux/COPYING for more information.
+ *
+ * This file contains the PCI routines required for the Galileo GT6411
+ * PCI bridge as used on the Orion and Overdrive boards.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+
+#include <asm/overdrive/overdrive.h>
+#include <asm/overdrive/gt64111.h>
+
+
+/* After boot, we shift the Galileo registers so that they appear
+ * in BANK6, along with IO space. This means we can have one contingous
+ * lump of PCI address space without these registers appearing in the
+ * middle of them
+ */
+
+#define GT64111_BASE_ADDRESS 0xbb000000
+#define GT64111_IO_BASE_ADDRESS 0x1000
+/* The GT64111 registers appear at this address to the SH4 after reset */
+#define RESET_GT64111_BASE_ADDRESS 0xb4000000
+
+/* Macros used to access the Galileo registers */
+#define RESET_GT64111_REG(x) (RESET_GT64111_BASE_ADDRESS+x)
+#define GT64111_REG(x) (GT64111_BASE_ADDRESS+x)
+
+#define RESET_GT_WRITE(x,v) writel((v),RESET_GT64111_REG(x))
+
+#define RESET_GT_READ(x) readl(RESET_GT64111_REG(x))
+
+#define GT_WRITE(x,v) writel((v),GT64111_REG(x))
+#define GT_WRITE_BYTE(x,v) writeb((v),GT64111_REG(x))
+#define GT_WRITE_SHORT(x,v) writew((v),GT64111_REG(x))
+
+#define GT_READ(x) readl(GT64111_REG(x))
+#define GT_READ_BYTE(x) readb(GT64111_REG(x))
+#define GT_READ_SHORT(x) readw(GT64111_REG(x))
+
+
+/* Where the various SH banks start at */
+#define SH_BANK4_ADR 0xb0000000
+#define SH_BANK5_ADR 0xb4000000
+#define SH_BANK6_ADR 0xb8000000
+
+/* Masks out everything but lines 28,27,26 */
+#define BANK_SELECT_MASK 0x1c000000
+
+#define SH4_TO_BANK(x) ( (x) & BANK_SELECT_MASK)
+
+/*
+ * Masks used for address conversaion. Bank 6 is used for IO and
+ * has all the address bits zeroed by the FPGA. Special case this
+ */
+#define MEMORY_BANK_MASK 0x1fffffff
+#define IO_BANK_MASK 0x03ffffff
+
+/* Mark bank 6 as the bank used for IO. You can change this in the FPGA code
+ * if you want
+ */
+#define IO_BANK_ADR PCI_GTIO_BASE
+
+/* Will select the correct mask to apply depending on the SH$ address */
+#define SELECT_BANK_MASK(x) \
+ ( (SH4_TO_BANK(x)==SH4_TO_BANK(IO_BANK_ADR)) ? IO_BANK_MASK : MEMORY_BANK_MASK)
+
+/* Converts between PCI space and P2 region */
+#define SH4_TO_PCI(x) ((x)&SELECT_BANK_MASK(x))
+
+/* Various macros for figuring out what to stick in the Galileo registers.
+ * You *really* don't want to figure this stuff out by hand, you always get
+ * it wrong
+ */
+#define GT_MEM_LO_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7ff)
+#define GT_MEM_HI_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>21)&0x7f)
+#define GT_MEM_SUB_ADR(x) ((((unsigned)((x)&SELECT_BANK_MASK(x)))>>20)&0xff)
+
+#define PROGRAM_HI_LO(block,a,s) \
+ GT_WRITE(block##_LO_DEC_ADR,GT_MEM_LO_ADR(a));\
+ GT_WRITE(block##_HI_DEC_ADR,GT_MEM_HI_ADR(a+s-1))
+
+#define PROGRAM_SUB_HI_LO(block,a,s) \
+ GT_WRITE(block##_LO_DEC_ADR,GT_MEM_SUB_ADR(a));\
+ GT_WRITE(block##_HI_DEC_ADR,GT_MEM_SUB_ADR(a+s-1))
+
+/* We need to set the size, and the offset register */
+
+#define GT_BAR_MASK(x) ((x)&~0xfff)
+
+/* Macro to set up the BAR in the Galileo. Essentially used for the DRAM */
+#define PROGRAM_GT_BAR(block,a,s) \
+ GT_WRITE(PCI_##block##_BANK_SIZE,GT_BAR_MASK((s-1)));\
+ write_config_to_galileo(PCI_CONFIG_##block##_BASE_ADR,\
+ GT_BAR_MASK(a))
+
+#define DISABLE_GT_BAR(block) \
+ GT_WRITE(PCI_##block##_BANK_SIZE,0),\
+ GT_CONFIG_WRITE(PCI_CONFIG_##block##_BASE_ADR,\
+ 0x80000000)
+
+/* Macros to disable things we are not going to use */
+#define DISABLE_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0x7ff);\
+ GT_WRITE(x##_HI_DEC_ADR,0x00)
+
+#define DISABLE_SUB_DECODE(x) GT_WRITE(x##_LO_DEC_ADR,0xff);\
+ GT_WRITE(x##_HI_DEC_ADR,0x00)
+
+static void __init reset_pci(void)
+{
+ /* Set RESET_PCI bit high */
+ writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
+ udelay(250);
+
+ /* Set RESET_PCI bit low */
+ writeb(readb(OVERDRIVE_CTRL) & RESET_PCI_MASK, OVERDRIVE_CTRL);
+ udelay(250);
+
+ writeb(readb(OVERDRIVE_CTRL) | ENABLE_PCI_BIT, OVERDRIVE_CTRL);
+ udelay(250);
+}
+
+static int write_config_to_galileo(int where, u32 val);
+#define GT_CONFIG_WRITE(where,val) write_config_to_galileo(where,val)
+
+#define ENABLE_PCI_DRAM
+
+
+#ifdef TEST_DRAM
+/* Test function to check out if the PCI DRAM is working OK */
+static int /* __init */ test_dram(unsigned *base, unsigned size)
+{
+ unsigned *p = base;
+ unsigned *end = (unsigned *) (((unsigned) base) + size);
+ unsigned w;
+
+ for (p = base; p < end; p++) {
+ *p = 0xffffffff;
+ if (*p != 0xffffffff) {
+ printk("AAARGH -write failed!!! at %p is %x\n", p,
+ *p);
+ return 0;
+ }
+ *p = 0x0;
+ if (*p != 0x0) {
+ printk("AAARGH -write failed!!!\n");
+ return 0;
+ }
+ }
+
+ for (p = base; p < end; p++) {
+ *p = (unsigned) p;
+ if (*p != (unsigned) p) {
+ printk("Failed at 0x%p, actually is 0x%x\n", p,
+ *p);
+ return 0;
+ }
+ }
+
+ for (p = base; p < end; p++) {
+ w = ((unsigned) p & 0xffff0000);
+ *p = w | (w >> 16);
+ }
+
+ for (p = base; p < end; p++) {
+ w = ((unsigned) p & 0xffff0000);
+ w |= (w >> 16);
+ if (*p != w) {
+ printk
+ ("Failed at 0x%p, should be 0x%x actually is 0x%x\n",
+ p, w, *p);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+#endif
+
+
+/* Function to set up and initialise the galileo. This sets up the BARS,
+ * maps the DRAM into the address space etc,etc
+ */
+int __init galileo_init(void)
+{
+ reset_pci();
+
+ /* Now shift the galileo regs into this block */
+ RESET_GT_WRITE(INTERNAL_SPACE_DEC,
+ GT_MEM_LO_ADR(GT64111_BASE_ADDRESS));
+
+ /* Should have a sanity check here, that you can read back at the new
+ * address what you just wrote
+ */
+
+ /* Disable decode for all regions */
+ DISABLE_DECODE(RAS10);
+ DISABLE_DECODE(RAS32);
+ DISABLE_DECODE(CS20);
+ DISABLE_DECODE(CS3);
+ DISABLE_DECODE(PCI_IO);
+ DISABLE_DECODE(PCI_MEM0);
+ DISABLE_DECODE(PCI_MEM1);
+
+ /* Disable all BARS */
+ GT_WRITE(BAR_ENABLE_ADR, 0x1ff);
+ DISABLE_GT_BAR(RAS10);
+ DISABLE_GT_BAR(RAS32);
+ DISABLE_GT_BAR(CS20);
+ DISABLE_GT_BAR(CS3);
+
+ /* Tell the BAR where the IO registers now are */
+ GT_CONFIG_WRITE(PCI_CONFIG_INT_REG_IO_ADR,GT_BAR_MASK(
+ (GT64111_IO_BASE_ADDRESS &
+ IO_BANK_MASK)));
+ /* set up a 112 Mb decode */
+ PROGRAM_HI_LO(PCI_MEM0, SH_BANK4_ADR, 112 * 1024 * 1024);
+
+ /* Set up a 32 MB io space decode */
+ PROGRAM_HI_LO(PCI_IO, IO_BANK_ADR, 32 * 1024 * 1024);
+
+#ifdef ENABLE_PCI_DRAM
+ /* Program up the DRAM configuration - there is DRAM only in bank 0 */
+ /* Now set up the DRAM decode */
+ PROGRAM_HI_LO(RAS10, PCI_DRAM_BASE, PCI_DRAM_SIZE);
+ /* And the sub decode */
+ PROGRAM_SUB_HI_LO(RAS0, PCI_DRAM_BASE, PCI_DRAM_SIZE);
+
+ DISABLE_SUB_DECODE(RAS1);
+
+ /* Set refresh rate */
+ GT_WRITE(DRAM_BANK0_PARMS, 0x3f);
+ GT_WRITE(DRAM_CFG, 0x100);
+
+ /* we have to lob off the top bits rememeber!! */
+ PROGRAM_GT_BAR(RAS10, SH4_TO_PCI(PCI_DRAM_BASE), PCI_DRAM_SIZE);
+
+#endif
+
+ /* We are only interested in decoding RAS10 and the Galileo's internal
+ * registers (as IO) on the PCI bus
+ */
+#ifdef ENABLE_PCI_DRAM
+ GT_WRITE(BAR_ENABLE_ADR, (~((1 << 8) | (1 << 3))) & 0x1ff);
+#else
+ GT_WRITE(BAR_ENABLE_ADR, (~(1 << 3)) & 0x1ff);
+#endif
+
+ /* Change the class code to host bridge, it actually powers up
+ * as a memory controller
+ */
+ GT_CONFIG_WRITE(8, 0x06000011);
+
+ /* Allow the galileo to master the PCI bus */
+ GT_CONFIG_WRITE(PCI_COMMAND,
+ PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_IO);
+
+
+#if 0
+ printk("Testing PCI DRAM - ");
+ if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
+ printk("Passed\n");
+ }else {
+ printk("FAILED\n");
+ }
+#endif
+ return 0;
+
+}
+
+
+#define SET_CONFIG_BITS(bus,devfn,where)\
+ ((1<<31) | ((bus) << 16) | ((devfn) << 8) | ((where) & ~3))
+
+#define CONFIG_CMD(dev, where) SET_CONFIG_BITS((dev)->bus->number,(dev)->devfn,where)
+
+/* This write to the galileo config registers, unlike the functions below, can
+ * be used before the PCI subsystem has started up
+ */
+static int __init write_config_to_galileo(int where, u32 val)
+{
+ GT_WRITE(PCI_CFG_ADR, SET_CONFIG_BITS(0, 0, where));
+
+ GT_WRITE(PCI_CFG_DATA, val);
+ return 0;
+}
+
+/* We exclude the galileo and slot 31, the galileo because I don't know how to stop
+ * the setup code shagging up the setup I have done on it, and 31 because the whole
+ * thing locks up if you try to access that slot (which doesn't exist of course anyway
+ */
+
+#define EXCLUDED_DEV(dev) ((dev->bus->number==0) && ((PCI_SLOT(dev->devfn)==0) || (PCI_SLOT(dev->devfn) == 31)))
+
+static int galileo_read_config_byte(struct pci_dev *dev, int where,
+ u8 * val)
+{
+
+
+ /* I suspect this doesn't work because this drives a special cycle ? */
+ if (EXCLUDED_DEV(dev)) {
+ *val = 0xff;
+ return PCIBIOS_SUCCESSFUL;
+ }
+ /* Start the config cycle */
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+ /* Read back the result */
+ *val = GT_READ_BYTE(PCI_CFG_DATA + (where & 3));
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int galileo_read_config_word(struct pci_dev *dev, int where,
+ u16 * val)
+{
+
+ if (EXCLUDED_DEV(dev)) {
+ *val = 0xffff;
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+ *val = GT_READ_SHORT(PCI_CFG_DATA + (where & 2));
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int galileo_read_config_dword(struct pci_dev *dev, int where,
+ u32 * val)
+{
+ if (EXCLUDED_DEV(dev)) {
+ *val = 0xffffffff;
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+ *val = GT_READ(PCI_CFG_DATA);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int galileo_write_config_byte(struct pci_dev *dev, int where,
+ u8 val)
+{
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+
+ GT_WRITE_BYTE(PCI_CFG_DATA + (where & 3), val);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int galileo_write_config_word(struct pci_dev *dev, int where,
+ u16 val)
+{
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+
+ GT_WRITE_SHORT(PCI_CFG_DATA + (where & 2), val);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int galileo_write_config_dword(struct pci_dev *dev, int where,
+ u32 val)
+{
+ GT_WRITE(PCI_CFG_ADR, CONFIG_CMD(dev, where));
+
+ GT_WRITE(PCI_CFG_DATA, val);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops pci_config_ops = {
+ galileo_read_config_byte,
+ galileo_read_config_word,
+ galileo_read_config_dword,
+ galileo_write_config_byte,
+ galileo_write_config_word,
+ galileo_write_config_dword
+};
+
+
+/* Everything hangs off this */
+static struct pci_bus *pci_root_bus;
+
+
+static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
+{
+ return PCI_SLOT(dev->devfn);
+}
+
+static int __init map_od_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ /* Slot 1: Galileo
+ * Slot 2: PCI Slot 1
+ * Slot 3: PCI Slot 2
+ * Slot 4: ESS
+ */
+ switch (slot) {
+ case 2:
+ return OVERDRIVE_PCI_IRQ1;
+ case 3:
+ /* Note this assumes you have a hacked card in slot 2 */
+ return OVERDRIVE_PCI_IRQ2;
+ case 4:
+ return OVERDRIVE_ESS_IRQ;
+ default:
+ /* printk("PCI: Unexpected IRQ mapping request for slot %d\n", slot); */
+ return -1;
+ }
+}
+
+
+
+void __init
+pcibios_fixup_pbus_ranges(struct pci_bus *bus, struct pbus_set_ranges_data *ranges)
+{
+ ranges->io_start -= bus->resource[0]->start;
+ ranges->io_end -= bus->resource[0]->start;
+ ranges->mem_start -= bus->resource[1]->start;
+ ranges->mem_end -= bus->resource[1]->start;
+}
+
+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);
+
+void __init pcibios_init(void)
+{
+ static struct resource galio,galmem;
+
+ /* Allocate the registers used by the Galileo */
+ galio.flags = IORESOURCE_IO;
+ galio.name = "Galileo GT64011";
+ galmem.flags = IORESOURCE_MEM|IORESOURCE_PREFETCH;
+ galmem.name = "Galileo GT64011 DRAM";
+
+ allocate_resource(&ioport_resource, &galio, 256,
+ GT64111_IO_BASE_ADDRESS,GT64111_IO_BASE_ADDRESS+256, 256, NULL, NULL);
+ allocate_resource(&iomem_resource, &galmem,PCI_DRAM_SIZE,
+ PHYSADDR(PCI_DRAM_BASE), PHYSADDR(PCI_DRAM_BASE)+PCI_DRAM_SIZE,
+ PCI_DRAM_SIZE, NULL, NULL);
+
+ /* ok, do the scan man */
+ pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
+
+ pci_assign_unassigned_resources();
+ pci_fixup_irqs(no_swizzle, map_od_irq);
+
+#ifdef TEST_DRAM
+ printk("Testing PCI DRAM - ");
+ if(test_dram(PCI_DRAM_BASE,PCI_DRAM_SIZE)) {
+ printk("Passed\n");
+ }else {
+ printk("FAILED\n");
+ }
+#endif
+
+}
+
+char * __init pcibios_setup(char *str)
+{
+ return str;
+}
+
+
+
+int pcibios_enable_device(struct pci_dev *dev)
+{
+
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for (idx = 0; idx < 6; idx++) {
+ r = dev->resource + idx;
+ if (!r->start && r->end) {
+ printk(KERN_ERR
+ "PCI: Device %s not available because"
+ " of resource collisions\n",
+ pci_name(dev));
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (cmd != old_cmd) {
+ printk("PCI: enabling device %s (%04x -> %04x)\n",
+ pci_name(dev), old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+ return 0;
+
+}
+
+/* We should do some optimisation work here I think. Ok for now though */
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+
+}
+
+void pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size)
+{
+}
+
+void __init pcibios_update_resource(struct pci_dev *dev, struct resource *root,
+ struct resource *res, int resource)
+{
+
+ unsigned long where, size;
+ u32 reg;
+
+
+ printk("PCI: Assigning %3s %08lx to %s\n",
+ res->flags & IORESOURCE_IO ? "IO" : "MEM",
+ res->start, dev->name);
+
+ where = PCI_BASE_ADDRESS_0 + resource * 4;
+ size = res->end - res->start;
+
+ pci_read_config_dword(dev, where, &reg);
+ reg = (reg & size) | (((u32) (res->start - root->start)) & ~size);
+ pci_write_config_dword(dev, where, reg);
+}
+
+
+void __init pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+ printk("PCI: Assigning IRQ %02d to %s\n", irq, dev->name);
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+/*
+ * If we set up a device for bus mastering, we need to check the latency
+ * timer as certain crappy BIOSes forget to set it properly.
+ */
+unsigned int pcibios_max_latency = 255;
+
+void pcibios_set_master(struct pci_dev *dev)
+{
+ u8 lat;
+ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+ if (lat < 16)
+ lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+ else if (lat > pcibios_max_latency)
+ lat = pcibios_max_latency;
+ else
+ return;
+ printk("PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.