patch-2.4.6 linux/arch/sh/kernel/setup_dc.c
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- Lines: 480
- Date:
Wed Jun 27 13:55:29 2001
- Orig file:
v2.4.5/linux/arch/sh/kernel/setup_dc.c
- Orig date:
Sun May 20 12:11:38 2001
diff -u --recursive --new-file v2.4.5/linux/arch/sh/kernel/setup_dc.c linux/arch/sh/kernel/setup_dc.c
@@ -1,5 +1,15 @@
-/*
- * $Id: setup_dc.c,v 1.1 2001/04/01 15:02:00 yaegashi Exp $
+/* arch/sh/kernel/setup_dc.c
+ *
+ * Hardware support for the Sega Dreamcast.
+ *
+ * Copyright (c) 2001 M. R. Brown <mrbrown@linuxdc.org>
+ *
+ * This file is part of the LinuxDC project (www.linuxdc.org)
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ *
+ * This file originally bore the message:
+ * $Id: setup_dc.c,v 1.5 2001/05/24 05:09:16 mrbrown Exp $
* SEGA Dreamcast support
*/
@@ -9,105 +19,167 @@
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
-#include <linux/pci.h>
#include <asm/io.h>
#include <asm/irq.h>
+#include <asm/dc_sysasic.h>
-#define GAPSPCI_REGS 0x01001400
-#define GAPSPCI_DMA_BASE 0x01840000
-#define GAPSPCI_DMA_SIZE 32768
-#define GAPSPCI_BBA_CONFIG 0x01001600
+int __init gapspci_init(void);
-#define GAPSPCI_IRQ 11
-#define GAPSPCI_INTC 0x005f6924
+#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
-static int gapspci_dma_used;
+/* Dreamcast System ASIC Hardware Events -
+
+ The Dreamcast's System ASIC (located on the PowerVR2 chip) is responsible
+ for receiving hardware events from system peripherals and triggering an
+ SH7750 IRQ. Hardware events can trigger IRQs 13, 11, or 9 depending on
+ which bits are set in the Event Mask Registers (EMRs). When a hardware
+ event is triggered, it's corresponding bit in the Event Status Registers
+ (ESRs) is set, and that bit should be rewritten to the ESR to acknowledge
+ that event.
-static struct pci_bus *pci_root_bus;
+ There are three 32-bit ESRs located at 0xa05f8900 - 0xa05f6908. Event
+ types can be found in include/asm-sh/dc_sysasic.h. There are three groups
+ of EMRs that parallel the ESRs. Each EMR group corresponds to an IRQ, so
+ 0xa05f6910 - 0xa05f6918 triggers IRQ 13, 0xa05f6920 - 0xa05f6928 triggers
+ IRQ 11, and 0xa05f6930 - 0xa05f6938 triggers IRQ 9.
-static void disable_gapspci_irq(unsigned int irq)
-{
- unsigned long flags;
- unsigned long intc;
+ In the kernel, these events are mapped to virtual IRQs so that drivers can
+ respond to them as they would a normal interrupt. In order to keep this
+ mapping simple, the events are mapped as:
- save_and_cli(flags);
- intc = inl(GAPSPCI_INTC);
- intc &= ~(1<<3);
- outl(intc, GAPSPCI_INTC);
- restore_flags(flags);
-}
+ 6900/6910 - Events 0-31, IRQ 13
+ 6904/6924 - Events 32-63, IRQ 11
+ 6908/6938 - Events 64-95, IRQ 9
+*/
-static void enable_gapspci_irq(unsigned int irq)
-{
- unsigned long flags;
- unsigned long intc;
+#define ESR_BASE 0x005f6900 /* Base event status register */
+#define EMR_BASE 0x005f6910 /* Base event mask register */
- save_and_cli(flags);
- intc = inl(GAPSPCI_INTC);
- intc |= (1<<3);
- outl(intc, GAPSPCI_INTC);
- restore_flags(flags);
-}
+/* Helps us determine the EMR group that this event belongs to: 0 = 0x6910,
+ 1 = 0x6920, 2 = 0x6930; also determine the event offset */
+#define LEVEL(event) (((event) - HW_EVENT_IRQ_BASE) / 32)
+
+/* Return the hardware event's bit positon within the EMR/ESR */
+#define EVENT_BIT(event) (((event) - HW_EVENT_IRQ_BASE) & 31)
+/* For each of these *_irq routines, the IRQ passed in is the virtual IRQ
+ (logically mapped to the corresponding bit for the hardware event). */
-static void mask_and_ack_gapspci_irq(unsigned int irq)
+/* Disable the hardware event by masking its bit in its EMR */
+static inline void disable_systemasic_irq(unsigned int irq)
{
- unsigned long flags;
- unsigned long intc;
+ __u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2);
+ __u32 mask;
+ mask = inl(emr);
+ mask &= ~(1 << EVENT_BIT(irq));
+ outl(mask, emr);
+}
- save_and_cli(flags);
- intc = inl(GAPSPCI_INTC);
- intc &= ~(1<<3);
- outl(intc, GAPSPCI_INTC);
- restore_flags(flags);
+/* Enable the hardware event by setting its bit in its EMR */
+static inline void enable_systemasic_irq(unsigned int irq)
+{
+ __u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2);
+ __u32 mask;
+ mask = inl(emr);
+ mask |= (1 << EVENT_BIT(irq));
+ outl(mask, emr);
}
+/* Acknowledge a hardware event by writing its bit back to its ESR */
+static void ack_systemasic_irq(unsigned int irq)
+{
+ __u32 esr = ESR_BASE + (LEVEL(irq) << 2);
+ disable_systemasic_irq(irq);
+ outl((1 << EVENT_BIT(irq)), esr);
+}
-static void end_gapspci_irq(unsigned int irq)
+/* After a IRQ has been ack'd and responded to, it needs to be renabled */
+static void end_systemasic_irq(unsigned int irq)
{
- enable_gapspci_irq(irq);
+ enable_systemasic_irq(irq);
}
+static unsigned int startup_systemasic_irq(unsigned int irq)
+{
+ enable_systemasic_irq(irq);
-static unsigned int startup_gapspci_irq(unsigned int irq)
-{
- enable_gapspci_irq(irq);
return 0;
}
-
-static void shutdown_gapspci_irq(unsigned int irq)
+static void shutdown_systemasic_irq(unsigned int irq)
{
- disable_gapspci_irq(irq);
+ disable_systemasic_irq(irq);
}
-
-static struct hw_interrupt_type gapspci_irq_type = {
- "GAPSPCI-IRQ",
- startup_gapspci_irq,
- shutdown_gapspci_irq,
- enable_gapspci_irq,
- disable_gapspci_irq,
- mask_and_ack_gapspci_irq,
- end_gapspci_irq
+static struct hw_interrupt_type systemasic_int = {
+ typename: "System ASIC",
+ startup: startup_systemasic_irq,
+ shutdown: shutdown_systemasic_irq,
+ enable: enable_systemasic_irq,
+ disable: disable_systemasic_irq,
+ ack: ack_systemasic_irq,
+ end: end_systemasic_irq,
};
-
-static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
+/*
+ * Map the hardware event indicated by the processor IRQ to a virtual IRQ.
+ */
+int systemasic_irq_demux(int irq)
{
- return PCI_SLOT(dev->devfn);
-}
+ __u32 emr, esr, status, level;
+ __u32 j, bit;
-static int __init map_od_irq(struct pci_dev *dev, u8 slot, u8 pin)
-{
- return GAPSPCI_IRQ;
+ switch (irq) {
+ case 13:
+ level = 0;
+ break;
+ case 11:
+ level = 1;
+ break;
+ case 9:
+ level = 2;
+ break;
+ default:
+ return irq;
+ }
+ emr = EMR_BASE + (level << 4) + (level << 2);
+ esr = ESR_BASE + (level << 2);
+
+ /* Mask the ESR to filter any spurious, unwanted interrtupts */
+ status = inl(esr);
+ status &= inl(emr);
+
+ /* Now scan and find the first set bit as the event to map */
+ for (bit = 1, j = 0; j < 32; bit <<= 1, j++) {
+ if (status & bit) {
+ irq = HW_EVENT_IRQ_BASE + j + (level << 5);
+ return irq;
+ }
+ }
+
+ /* Not reached */
+ return irq;
}
int __init setup_dreamcast(void)
{
+ int i;
+
+ /* Mask all hardware events */
+ /* XXX */
+
+ /* Acknowledge any previous events */
+ /* XXX */
+
+ /* Assign all virtual IRQs to the System ASIC int. handler */
+ for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++)
+ irq_desc[i].handler = &systemasic_int;
+
+#ifdef CONFIG_PCI
gapspci_init();
+#endif
printk(KERN_INFO "SEGA Dreamcast support.\n");
#if 0
@@ -128,232 +200,5 @@
* PCR: 0x0000
*/
#endif
- return 0;
-}
-
-
-/*
- * Dreamcast PCI: Supports SEGA Broadband Adaptor only.
- */
-
-#define BBA_SELECTED(dev) (dev->bus->number==0 && dev->devfn==0)
-
-static int gapspci_read_config_byte(struct pci_dev *dev, int where,
- u8 * val)
-{
- if (BBA_SELECTED(dev))
- *val = inb(GAPSPCI_BBA_CONFIG+where);
- else
- *val = 0xff;
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int gapspci_read_config_word(struct pci_dev *dev, int where,
- u16 * val)
-{
- if (BBA_SELECTED(dev))
- *val = inw(GAPSPCI_BBA_CONFIG+where);
- else
- *val = 0xffff;
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int gapspci_read_config_dword(struct pci_dev *dev, int where,
- u32 * val)
-{
- if (BBA_SELECTED(dev))
- *val = inl(GAPSPCI_BBA_CONFIG+where);
- else
- *val = 0xffffffff;
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int gapspci_write_config_byte(struct pci_dev *dev, int where,
- u8 val)
-{
- if (BBA_SELECTED(dev))
- outb(val, GAPSPCI_BBA_CONFIG+where);
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-
-static int gapspci_write_config_word(struct pci_dev *dev, int where,
- u16 val)
-{
- if (BBA_SELECTED(dev))
- outw(val, GAPSPCI_BBA_CONFIG+where);
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int gapspci_write_config_dword(struct pci_dev *dev, int where,
- u32 val)
-{
- if (BBA_SELECTED(dev))
- outl(val, GAPSPCI_BBA_CONFIG+where);
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static struct pci_ops pci_config_ops = {
- gapspci_read_config_byte,
- gapspci_read_config_word,
- gapspci_read_config_dword,
- gapspci_write_config_byte,
- gapspci_write_config_word,
- gapspci_write_config_dword
-};
-
-
-void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size)
-{
-}
-
-
-void __init pcibios_update_irq(struct pci_dev *dev, int irq)
-{
-}
-
-
-void __init pcibios_update_resource(struct pci_dev *dev, struct resource *root,
- struct resource *res, int resource)
-{
-}
-
-
-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",
- dev->slot_name);
- 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",
- dev->slot_name, old_cmd, cmd);
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
- return 0;
-
-}
-
-
-void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
- dma_addr_t * dma_handle)
-{
- unsigned long buf;
-
- if (gapspci_dma_used+size > GAPSPCI_DMA_SIZE)
- return NULL;
-
- buf = GAPSPCI_DMA_BASE+gapspci_dma_used;
-
- gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
-
- printk("pci_alloc_consistent: %d bytes at 0x%08x\n", size, buf);
-
- *dma_handle = (dma_addr_t)buf;
-
- return (void *)P2SEGADDR(buf);
-}
-
-
-void pci_free_consistent(struct pci_dev *hwdev, size_t size,
- void *vaddr, dma_addr_t dma_handle)
-{
-}
-
-
-void __init
-pcibios_fixup_pbus_ranges(struct pci_bus *bus, struct pbus_set_ranges_data *ranges)
-{
-}
-
-void __init pcibios_fixup_bus(struct pci_bus *bus)
-{
- struct list_head *ln;
- struct pci_dev *dev;
-
- for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
- dev = pci_dev_b(ln);
- if (!BBA_SELECTED(dev)) continue;
-
- printk("PCI: MMIO fixup to %s\n", dev->name);
- dev->resource[1].start=0x01001700;
- dev->resource[1].end=0x010017ff;
- }
-}
-
-
-void __init dreamcast_pcibios_init(void)
-{
- pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
- /* pci_assign_unassigned_resources(); */
- pci_fixup_irqs(no_swizzle, map_od_irq);
-}
-
-
-static __init int gapspci_init(void)
-{
- int i;
- char idbuf[16];
-
- for(i=0; i<16; i++)
- idbuf[i]=inb(GAPSPCI_REGS+i);
-
- if(strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
- return -1;
-
- outl(0x5a14a501, GAPSPCI_REGS+0x18);
-
- for(i=0; i<1000000; i++);
-
- if(inl(GAPSPCI_REGS+0x18)!=1)
- return -1;
-
- outl(0x01000000, GAPSPCI_REGS+0x20);
- outl(0x01000000, GAPSPCI_REGS+0x24);
-
- outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
- outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
-
- outl(1, GAPSPCI_REGS+0x14);
- outl(1, GAPSPCI_REGS+0x34);
-
- gapspci_dma_used=0;
-
- /* */
- irq_desc[GAPSPCI_IRQ].handler = &gapspci_irq_type;
-
- /* Setting Broadband Adapter */
- outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
- outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
- outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
- outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
- outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
- outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
- outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
-
return 0;
}
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