1 files changed, 444 insertions, 0 deletions
diff --git a/arch/m68k/atari/hades-pci.c b/arch/m68k/atari/hades-pci.c
new file mode 100644
index 00000000000..8888debf71e
--- /dev/null
+++ b/arch/m68k/atari/hades-pci.c
@@ -0,0 +1,444 @@
+/*
+ * hades-pci.c - Hardware specific PCI BIOS functions the Hades Atari clone.
+ *
+ * Written by Wout Klaren.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/io.h>
+
+#if 0
+# define DBG_DEVS(args)		printk args
+#else
+# define DBG_DEVS(args)
+#endif
+
+#if defined(CONFIG_PCI) && defined(CONFIG_HADES)
+
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/pci.h>
+
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/byteorder.h>
+#include <asm/pci.h>
+
+#define HADES_MEM_BASE		0x80000000
+#define HADES_MEM_SIZE		0x20000000
+#define HADES_CONFIG_BASE	0xA0000000
+#define HADES_CONFIG_SIZE	0x10000000
+#define HADES_IO_BASE		0xB0000000
+#define HADES_IO_SIZE		0x10000000
+#define HADES_VIRT_IO_SIZE	0x00010000	/* Only 64k is remapped and actually used. */
+
+#define N_SLOTS				4			/* Number of PCI slots. */
+
+static const char pci_mem_name[] = "PCI memory space";
+static const char pci_io_name[] = "PCI I/O space";
+static const char pci_config_name[] = "PCI config space";
+
+static struct resource config_space = {
+    .name = pci_config_name,
+    .start = HADES_CONFIG_BASE,
+    .end = HADES_CONFIG_BASE + HADES_CONFIG_SIZE - 1
+};
+static struct resource io_space = {
+    .name = pci_io_name,
+    .start = HADES_IO_BASE,
+    .end = HADES_IO_BASE + HADES_IO_SIZE - 1
+};
+
+static const unsigned long pci_conf_base_phys[] = {
+    0xA0080000, 0xA0040000, 0xA0020000, 0xA0010000
+};
+static unsigned long pci_conf_base_virt[N_SLOTS];
+static unsigned long pci_io_base_virt;
+
+/*
+ * static void *mk_conf_addr(unsigned char bus, unsigned char device_fn,
+ *			     unsigned char where)
+ *
+ * Calculate the address of the PCI configuration area of the given
+ * device.
+ *
+ * BUG: boards with multiple functions are probably not correctly
+ * supported.
+ */
+
+static void *mk_conf_addr(struct pci_dev *dev, int where)
+{
+	int device = dev->devfn >> 3, function = dev->devfn & 7;
+	void *result;
+
+	DBG_DEVS(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, pci_addr=0x%p)\n",
+		  dev->bus->number, dev->devfn, where, pci_addr));
+
+	if (device > 3)
+	{
+		DBG_DEVS(("mk_conf_addr: device (%d) > 3, returning NULL\n", device));
+		return NULL;
+	}
+
+	if (dev->bus->number != 0)
+	{
+		DBG_DEVS(("mk_conf_addr: bus (%d) > 0, returning NULL\n", device));
+		return NULL;
+	}
+
+	result = (void *) (pci_conf_base_virt[device] | (function << 8) | (where));
+	DBG_DEVS(("mk_conf_addr: returning pci_addr 0x%lx\n", (unsigned long) result));
+	return result;
+}
+
+static int hades_read_config_byte(struct pci_dev *dev, int where, u8 *value)
+{
+	volatile unsigned char *pci_addr;
+
+	*value = 0xff;
+
+	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*value = *pci_addr;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int hades_read_config_word(struct pci_dev *dev, int where, u16 *value)
+{
+	volatile unsigned short *pci_addr;
+
+	*value = 0xffff;
+
+	if (where & 0x1)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*value = le16_to_cpu(*pci_addr);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int hades_read_config_dword(struct pci_dev *dev, int where, u32 *value)
+{
+	volatile unsigned int *pci_addr;
+	unsigned char header_type;
+	int result;
+
+	*value = 0xffffffff;
+
+	if (where & 0x3)
+		return PCIBIOS_BAD_REGISTER_NUMBER;
+
+	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*value = le32_to_cpu(*pci_addr);
+
+	/*
+	 * Check if the value is an address on the bus. If true, add the
+	 * base address of the PCI memory or PCI I/O area on the Hades.
+	 */
+
+	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
+					     &header_type)) != PCIBIOS_SUCCESSFUL)
+		return result;
+
+	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) ||
+	    ((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
+							 (where <= PCI_BASE_ADDRESS_5))))
+	{
+		if ((*value & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
+		{
+			/*
+			 * Base address register that contains an I/O address. If the
+			 * address is valid on the Hades (0 <= *value < HADES_VIRT_IO_SIZE),
+			 * add 'pci_io_base_virt' to the value.
+			 */
+
+			if (*value < HADES_VIRT_IO_SIZE)
+				*value += pci_io_base_virt;
+		}
+		else
+		{
+			/*
+			 * Base address register that contains an memory address. If the
+			 * address is valid on the Hades (0 <= *value < HADES_MEM_SIZE),
+			 * add HADES_MEM_BASE to the value.
+			 */
+
+			if (*value == 0)
+			{
+				/*
+				 * Base address is 0. Test if this base
+				 * address register is used.
+				 */
+
+				*pci_addr = 0xffffffff;
+				if (*pci_addr != 0)
+				{
+					*pci_addr = *value;
+					if (*value < HADES_MEM_SIZE)
+						*value += HADES_MEM_BASE;
+				}
+			}
+			else
+			{
+				if (*value < HADES_MEM_SIZE)
+					*value += HADES_MEM_BASE;
+			}
+		}
+	}
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int hades_write_config_byte(struct pci_dev *dev, int where, u8 value)
+{
+	volatile unsigned char *pci_addr;
+
+	if ((pci_addr = (unsigned char *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*pci_addr = value;
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int hades_write_config_word(struct pci_dev *dev, int where, u16 value)
+{
+	volatile unsigned short *pci_addr;
+
+	if ((pci_addr = (unsigned short *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	*pci_addr = cpu_to_le16(value);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+static int hades_write_config_dword(struct pci_dev *dev, int where, u32 value)
+{
+	volatile unsigned int *pci_addr;
+	unsigned char header_type;
+	int result;
+
+	if ((pci_addr = (unsigned int *) mk_conf_addr(dev, where)) == NULL)
+		return PCIBIOS_DEVICE_NOT_FOUND;
+
+	/*
+	 * Check if the value is an address on the bus. If true, subtract the
+	 * base address of the PCI memory or PCI I/O area on the Hades.
+	 */
+
+	if ((result = hades_read_config_byte(dev, PCI_HEADER_TYPE,
+					     &header_type)) != PCIBIOS_SUCCESSFUL)
+		return result;
+
+	if (((where >= PCI_BASE_ADDRESS_0) && (where <= PCI_BASE_ADDRESS_1)) ||
+	    ((header_type != PCI_HEADER_TYPE_BRIDGE) && ((where >= PCI_BASE_ADDRESS_2) &&
+							 (where <= PCI_BASE_ADDRESS_5))))
+	{
+		if ((value & PCI_BASE_ADDRESS_SPACE) ==
+		    PCI_BASE_ADDRESS_SPACE_IO)
+		{
+			/*
+			 * I/O address. Check if the address is valid address on
+			 * the Hades (pci_io_base_virt <= value < pci_io_base_virt +
+			 * HADES_VIRT_IO_SIZE) or if the value is 0xffffffff. If not
+			 * true do not write the base address register. If it is a
+			 * valid base address subtract 'pci_io_base_virt' from the value.
+			 */
+
+			if ((value >= pci_io_base_virt) && (value < (pci_io_base_virt +
+														 HADES_VIRT_IO_SIZE)))
+				value -= pci_io_base_virt;
+			else
+			{
+				if (value != 0xffffffff)
+					return PCIBIOS_SET_FAILED;
+			}
+		}
+		else
+		{
+			/*
+			 * Memory address. Check if the address is valid address on
+			 * the Hades (HADES_MEM_BASE <= value < HADES_MEM_BASE + HADES_MEM_SIZE) or
+			 * if the value is 0xffffffff. If not true do not write
+			 * the base address register. If it is a valid base address
+			 * subtract HADES_MEM_BASE from the value.
+			 */
+
+			if ((value >= HADES_MEM_BASE) && (value < (HADES_MEM_BASE + HADES_MEM_SIZE)))
+				value -= HADES_MEM_BASE;
+			else
+			{
+				if (value != 0xffffffff)
+					return PCIBIOS_SET_FAILED;
+			}
+		}
+	}
+
+	*pci_addr = cpu_to_le32(value);
+
+	return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * static inline void hades_fixup(void)
+ *
+ * Assign IRQ numbers as used by Linux to the interrupt pins
+ * of the PCI cards.
+ */
+
+static void __init hades_fixup(int pci_modify)
+{
+	char irq_tab[4] = {
+		[0] = IRQ_TT_MFP_IO0,		/* Slot 0. */
+		[1] = IRQ_TT_MFP_IO1,		/* Slot 1. */
+		[2] = IRQ_TT_MFP_SCC,		/* Slot 2. */
+		[3] = IRQ_TT_MFP_SCSIDMA	/* Slot 3. */
+	};
+	struct pci_dev *dev = NULL;
+	unsigned char slot;
+
+	/*
+	 * Go through all devices, fixing up irqs as we see fit:
+	 */
+
+	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
+	{
+		if (dev->class >> 16 != PCI_BASE_CLASS_BRIDGE)
+		{
+			slot = PCI_SLOT(dev->devfn);	/* Determine slot number. */
+			dev->irq = irq_tab[slot];
+			if (pci_modify)
+				pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+		}
+	}
+}
+
+/*
+ * static void hades_conf_device(struct pci_dev *dev)
+ *
+ * Machine dependent Configure the given device.
+ *
+ * Parameters:
+ *
+ * dev		- the pci device.
+ */
+
+static void __init hades_conf_device(struct pci_dev *dev)
+{
+	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0);
+}
+
+static struct pci_ops hades_pci_ops = {
+	.read_byte =	hades_read_config_byte,
+	.read_word =	hades_read_config_word,
+	.read_dword =	hades_read_config_dword,
+	.write_byte =	hades_write_config_byte,
+	.write_word =	hades_write_config_word,
+	.write_dword =	hades_write_config_dword
+};
+
+/*
+ * struct pci_bus_info *init_hades_pci(void)
+ *
+ * Machine specific initialisation:
+ *
+ * - Allocate and initialise a 'pci_bus_info' structure
+ * - Initialise hardware
+ *
+ * Result: pointer to 'pci_bus_info' structure.
+ */
+
+struct pci_bus_info * __init init_hades_pci(void)
+{
+	struct pci_bus_info *bus;
+	int i;
+
+	/*
+	 * Remap I/O and configuration space.
+	 */
+
+	pci_io_base_virt = (unsigned long) ioremap(HADES_IO_BASE, HADES_VIRT_IO_SIZE);
+
+	for (i = 0; i < N_SLOTS; i++)
+		pci_conf_base_virt[i] = (unsigned long) ioremap(pci_conf_base_phys[i], 0x10000);
+
+	/*
+	 * Allocate memory for bus info structure.
+	 */
+
+	bus = kmalloc(sizeof(struct pci_bus_info), GFP_KERNEL);
+	if (!bus)
+		return NULL;
+	memset(bus, 0, sizeof(struct pci_bus_info));
+
+	/*
+	 * Claim resources. The m68k has no separate I/O space, both
+	 * PCI memory space and PCI I/O space are in memory space. Therefore
+	 * the I/O resources are requested in memory space as well.
+	 */
+
+	if (request_resource(&iomem_resource, &config_space) != 0)
+	{
+		kfree(bus);
+		return NULL;
+	}
+
+	if (request_resource(&iomem_resource, &io_space) != 0)
+	{
+		release_resource(&config_space);
+		kfree(bus);
+		return NULL;
+	}
+
+	bus->mem_space.start = HADES_MEM_BASE;
+	bus->mem_space.end = HADES_MEM_BASE + HADES_MEM_SIZE - 1;
+	bus->mem_space.name = pci_mem_name;
+#if 1
+	if (request_resource(&iomem_resource, &bus->mem_space) != 0)
+	{
+		release_resource(&io_space);
+		release_resource(&config_space);
+		kfree(bus);
+		return NULL;
+	}
+#endif
+	bus->io_space.start = pci_io_base_virt;
+	bus->io_space.end = pci_io_base_virt + HADES_VIRT_IO_SIZE - 1;
+	bus->io_space.name = pci_io_name;
+#if 1
+	if (request_resource(&ioport_resource, &bus->io_space) != 0)
+	{
+		release_resource(&bus->mem_space);
+		release_resource(&io_space);
+		release_resource(&config_space);
+		kfree(bus);
+		return NULL;
+	}
+#endif
+	/*
+	 * Set hardware dependent functions.
+	 */
+
+	bus->m68k_pci_ops = &hades_pci_ops;
+	bus->fixup = hades_fixup;
+	bus->conf_device = hades_conf_device;
+
+	/*
+	 * Select high to low edge for PCI interrupts.
+	 */
+
+	tt_mfp.active_edge &= ~0x27;
+
+	return bus;
+}
+#endif