-/*
- * hades-pci.c - Hardware specific PCI BIOS functions the Hades Atari clone.
- *
- * Written by Wout Klaren.
- */
-
-#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 = kzalloc(sizeof(struct pci_bus_info), GFP_KERNEL);
- if (unlikely(!bus))
- goto iounmap_base_virt;
-
- /*
- * 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 (unlikely(request_resource(&iomem_resource, &config_space) != 0))
- goto free_bus;
-
- if (unlikely(request_resource(&iomem_resource, &io_space) != 0))
- goto release_config_space;
-
- 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 (unlikely(request_resource(&iomem_resource, &bus->mem_space) != 0))
- goto release_io_space;
-#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 (unlikely(request_resource(&ioport_resource, &bus->io_space) != 0))
- goto release_bus_mem_space;
-#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;
-
-release_bus_mem_space:
- release_resource(&bus->mem_space);
-release_io_space:
- release_resource(&io_space);
-release_config_space:
- release_resource(&config_space);
-free_bus:
- kfree(bus);
-iounmap_base_virt:
- iounmap((void *)pci_io_base_virt);
-
- for (i = 0; i < N_SLOTS; i++)
- iounmap((void *)pci_conf_base_virt[i]);
-
- return NULL;
-}
-#endif
projects / linux-2.6-omap-h63xx.git / commitdiff