1 files changed, 341 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/pci-sh7780.c b/arch/sh/drivers/pci/pci-sh7780.c
new file mode 100644
index 00000000000..e09721330ac
--- /dev/null
+++ b/arch/sh/drivers/pci/pci-sh7780.c
@@ -0,0 +1,341 @@
+/*
+ *	Low-Level PCI Support for the SH7780
+ *
+ *  Dustin McIntire (dustin@sensoria.com)
+ *	Derived from arch/i386/kernel/pci-*.c which bore the message:
+ *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
+ *
+ *  Ported to the new API by Paul Mundt <lethal@linux-sh.org>
+ *  With cleanup by Paul van Gool <pvangool@mimotech.com>
+ *
+ *  May be copied or modified under the terms of the GNU General Public
+ *  License.  See linux/COPYING for more information.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+
+#include <asm/machvec.h>
+#include <asm/io.h>
+#include "pci-sh7780.h"
+
+static unsigned int pci_probe = PCI_PROBE_CONF1;
+extern int pci_fixup_pcic(void);
+
+/*
+ * Direct access to PCI hardware...
+ */
+
+#define CONFIG_CMD(bus, devfn, where) (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
+
+/*
+ * Functions for accessing PCI configuration space with type 1 accesses
+ */
+static int sh7780_pci_read(struct pci_bus *bus, unsigned int devfn,
+			   int where, int size, u32 *val)
+{
+	unsigned long flags;
+	u32 data;
+
+	/*
+	 * PCIPDR may only be accessed as 32 bit words,
+	 * so we must do byte alignment by hand
+	 */
+	local_irq_save(flags);
+	outl(CONFIG_CMD(bus, devfn, where), PCI_REG(SH7780_PCIPAR));
+	data = inl(PCI_REG(SH7780_PCIPDR));
+	local_irq_restore(flags);
+
+	switch (size) {
+	case 1:
+		*val = (data >> ((where & 3) << 3)) & 0xff;
+		break;
+	case 2:
+		*val = (data >> ((where & 2) << 3)) & 0xffff;
+		break;
+	case 4:
+		*val = data;
+		break;
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * Since SH7780 only does 32bit access we'll have to do a read,
+ * mask,write operation.
+ * We'll allow an odd byte offset, though it should be illegal.
+ */
+static int sh7780_pci_write(struct pci_bus *bus, unsigned int devfn,
+			    int where, int size, u32 val)
+{
+	unsigned long flags;
+	int shift;
+	u32 data;
+
+	local_irq_save(flags);
+	outl(CONFIG_CMD(bus, devfn, where), PCI_REG(SH7780_PCIPAR));
+	data = inl(PCI_REG(SH7780_PCIPDR));
+	local_irq_restore(flags);
+
+	switch (size) {
+	case 1:
+		shift = (where & 3) << 3;
+		data &= ~(0xff << shift);
+		data |= ((val & 0xff) << shift);
+		break;
+	case 2:
+		shift = (where & 2) << 3;
+		data &= ~(0xffff << shift);
+		data |= ((val & 0xffff) << shift);
+		break;
+	case 4:
+		data = val;
+		break;
+	default:
+		return PCIBIOS_FUNC_NOT_SUPPORTED;
+	}
+
+	outl(data, PCI_REG(SH7780_PCIPDR));
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+#undef CONFIG_CMD
+
+struct pci_ops sh7780_pci_ops = {
+	.read		= sh7780_pci_read,
+	.write		= sh7780_pci_write,
+};
+
+static int __init pci_check_direct(void)
+{
+	unsigned int tmp, id;
+
+	outl(0x00000001, SH7780_PCI_VCR2); /* Enable PCIC */
+
+	/* check for SH7780/SH7780R hardware */
+	id = inl(PCI_REG(SH7780_PCIVID));
+	if ((id != ((SH7780_DEVICE_ID << 16) | SH7780_VENDOR_ID)) &&
+	    (id != ((SH7781_DEVICE_ID << 16) | SH7780_VENDOR_ID))) {
+		printk(KERN_ERR "PCI: This is not an SH7780 (%x)\n", id);
+		return -ENODEV;
+	}
+
+	/*
+	 * Check if configuration works.
+	 */
+	if (pci_probe & PCI_PROBE_CONF1) {
+		tmp = inl(PCI_REG(SH7780_PCIPAR));
+		outl(0x80000000, PCI_REG(SH7780_PCIPAR));
+		if (inl(PCI_REG(SH7780_PCIPAR)) == 0x80000000) {
+			outl(tmp, PCI_REG(SH7780_PCIPAR));
+			printk(KERN_INFO "PCI: Using configuration type 1\n");
+			request_region(PCI_REG(SH7780_PCIPAR), 8, "PCI conf1");
+			return 0;
+		}
+		outl(tmp, PCI_REG(SH7780_PCIPAR));
+	}
+
+	pr_debug("PCI: pci_check_direct failed\n");
+	return -EINVAL;
+}
+
+/***************************************************************************************/
+
+/*
+ *  Handle bus scanning and fixups ....
+ */
+
+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;
+	pr_debug("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);
+
+/*
+ *  Called after each bus is probed, but before its children
+ *  are examined.
+ */
+
+void __init pcibios_fixup_bus(struct pci_bus *b)
+{
+	pci_read_bridge_bases(b);
+}
+
+/*
+ * Initialization. Try all known PCI access methods. Note that we support
+ * using both PCI BIOS and direct access: in such cases, we use I/O ports
+ * to access config space.
+ *
+ * Note that the platform specific initialization (BSC registers, and memory
+ * space mapping) will be called via the machine vectors (sh_mv.mv_pci_init()) if it
+ * exists and via the platform defined function pcibios_init_platform().
+ * See pci_bigsur.c for implementation;
+ *
+ * The BIOS version of the pci functions is not yet implemented but it is left
+ * in for completeness.  Currently an error will be genereated at compile time.
+ */
+
+static int __init sh7780_pci_init(void)
+{
+	int ret;
+
+	pr_debug("PCI: Starting intialization.\n");
+
+	/* Setup the INTC */
+	ctrl_outl(0x00200000, INTC_ICR0);	/* INTC SH-4 Mode */
+	ctrl_outl(0x00078000, INTC_INT2MSKCR);	/* enable PCIINTA - PCIINTD */
+	ctrl_outl(0x40000000, INTC_INTMSK1);	/* disable IRL4-7 Interrupt */
+	ctrl_outl(0x0000fffe, INTC_INTMSK2);	/* disable IRL4-7 Interrupt */
+	ctrl_outl(0x80000000, INTC_INTMSKCLR1);	/* enable IRL0-3 Interrupt */
+	ctrl_outl(0xfffe0000, INTC_INTMSKCLR2);	/* enable IRL0-3 Interrupt */
+
+	if ((ret = pci_check_direct()) != 0)
+		return ret;
+
+	return pcibios_init_platform();
+}
+
+core_initcall(sh7780_pci_init);
+
+int __init sh7780_pcic_init(struct sh7780_pci_address_map *map)
+{
+	u32 word;
+
+	/*
+	 * This code is unused for some boards as it is done in the
+	 * bootloader and doing it here means the MAC addresses loaded
+	 * by the bootloader get lost.
+	 */
+	if (!(map->flags & SH7780_PCIC_NO_RESET)) {
+		/* toggle PCI reset pin */
+		word = SH7780_PCICR_PREFIX | SH7780_PCICR_PRST;
+		outl(word,PCI_REG(SH7780_PCICR));
+		/* Wait for a long time... not 1 sec. but long enough */
+		mdelay(100);
+		word = SH7780_PCICR_PREFIX;
+		outl(word,PCI_REG(SH7780_PCICR));
+	}
+
+	/* set the command/status bits to:
+	 * Wait Cycle Control + Parity Enable + Bus Master +
+	 * Mem space enable
+	 */
+	outl(0x00000046, PCI_REG(SH7780_PCICMD));
+
+	/* define this host as the host bridge */
+	word = SH7780_PCI_HOST_BRIDGE << 24;
+	outl(word, PCI_REG(SH7780_PCIRID));
+
+	/* Set IO and Mem windows to local address
+	 * Make PCI and local address the same for easy 1 to 1 mapping
+	 * Window0 = map->window0.size @ non-cached area base = SDRAM
+	 * Window1 = map->window1.size @ cached area base = SDRAM
+	 */
+	word = ((map->window0.size - 1) & 0x1ff00001) | 0x01;
+	outl(0x07f00001, PCI_REG(SH7780_PCILSR0));
+	word = ((map->window1.size - 1) & 0x1ff00001) | 0x01;
+	outl(0x00000001, PCI_REG(SH7780_PCILSR1));
+	/* Set the values on window 0 PCI config registers */
+	word = P2SEGADDR(map->window0.base);
+	outl(0xa8000000, PCI_REG(SH7780_PCILAR0));
+	outl(0x08000000, PCI_REG(SH7780_PCIMBAR0));
+	/* Set the values on window 1 PCI config registers */
+	word = P2SEGADDR(map->window1.base);
+	outl(0x00000000, PCI_REG(SH7780_PCILAR1));
+	outl(0x00000000, PCI_REG(SH7780_PCIMBAR1));
+
+	/* Map IO space into PCI IO window
+	 * The IO window is 64K-PCIBIOS_MIN_IO in size
+	 * IO addresses will be translated to the
+	 * PCI IO window base address
+	 */
+	PCIDBG(3,"PCI: Mapping IO address 0x%x - 0x%x to base 0x%x\n", PCIBIOS_MIN_IO,
+	    (64*1024), SH7780_PCI_IO_BASE+PCIBIOS_MIN_IO);
+
+	/* NOTE: I'm ignoring the PCI error IRQs for now..
+	 * TODO: add support for the internal error interrupts and
+	 * DMA interrupts...
+	 */
+
+#ifdef CONFIG_SH_R7780RP
+	pci_fixup_pcic();
+#endif
+
+	/* SH7780 init done, set central function init complete */
+	/* use round robin mode to stop a device starving/overruning */
+	word = SH7780_PCICR_PREFIX | SH7780_PCICR_CFIN | /* SH7780_PCICR_ARBM |*/ SH7780_PCICR_FTO;
+	outl(word, PCI_REG(SH7780_PCICR));
+
+	return 1;
+}
+
+char * __init pcibios_setup(char *str)
+{
+	if (!strcmp(str, "off")) {
+		pci_probe = 0;
+		return NULL;
+	}
+
+	return str;
+}
+
+/*
+ *	IRQ functions
+ */
+static u8 __init sh7780_no_swizzle(struct pci_dev *dev, u8 *pin)
+{
+	/* no swizzling */
+	return PCI_SLOT(dev->devfn);
+}
+
+static int sh7780_pci_lookup_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+	int irq = -1;
+
+	/* now lookup the actual IRQ on a platform specific basis (pci-'platform'.c) */
+	irq = pcibios_map_platform_irq(slot,pin);
+	if( irq < 0 ) {
+		pr_debug("PCI: Error mapping IRQ on device %s\n", pci_name(dev));
+		return irq;
+	}
+
+	pr_debug("Setting IRQ for slot %s to %d\n", pci_name(dev), irq);
+
+	return irq;
+}
+
+void __init pcibios_fixup_irqs(void)
+{
+	pci_fixup_irqs(sh7780_no_swizzle, sh7780_pci_lookup_irq);
+}
+