diff options
Diffstat (limited to 'drivers/char/agp/i460-agp.c')
-rw-r--r-- | drivers/char/agp/i460-agp.c | 659 |
1 files changed, 0 insertions, 659 deletions
diff --git a/drivers/char/agp/i460-agp.c b/drivers/char/agp/i460-agp.c deleted file mode 100644 index 15b240ea48..0000000000 --- a/drivers/char/agp/i460-agp.c +++ /dev/null @@ -1,659 +0,0 @@ -/* - * For documentation on the i460 AGP interface, see Chapter 7 (AGP Subsystem) of - * the "Intel 460GTX Chipset Software Developer's Manual": - * http://www.intel.com/design/archives/itanium/downloads/248704.htm - */ -/* - * 460GX support by Chris Ahna <christopher.j.ahna@intel.com> - * Clean up & simplification by David Mosberger-Tang <davidm@hpl.hp.com> - */ -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/slab.h> -#include <linux/agp_backend.h> -#include <linux/log2.h> - -#include "agp.h" - -#define INTEL_I460_BAPBASE 0x98 -#define INTEL_I460_GXBCTL 0xa0 -#define INTEL_I460_AGPSIZ 0xa2 -#define INTEL_I460_ATTBASE 0xfe200000 -#define INTEL_I460_GATT_VALID (1UL << 24) -#define INTEL_I460_GATT_COHERENT (1UL << 25) - -/* - * The i460 can operate with large (4MB) pages, but there is no sane way to support this - * within the current kernel/DRM environment, so we disable the relevant code for now. - * See also comments in ia64_alloc_page()... - */ -#define I460_LARGE_IO_PAGES 0 - -#if I460_LARGE_IO_PAGES -# define I460_IO_PAGE_SHIFT i460.io_page_shift -#else -# define I460_IO_PAGE_SHIFT 12 -#endif - -#define I460_IOPAGES_PER_KPAGE (PAGE_SIZE >> I460_IO_PAGE_SHIFT) -#define I460_KPAGES_PER_IOPAGE (1 << (I460_IO_PAGE_SHIFT - PAGE_SHIFT)) -#define I460_SRAM_IO_DISABLE (1 << 4) -#define I460_BAPBASE_ENABLE (1 << 3) -#define I460_AGPSIZ_MASK 0x7 -#define I460_4M_PS (1 << 1) - -/* Control bits for Out-Of-GART coherency and Burst Write Combining */ -#define I460_GXBCTL_OOG (1UL << 0) -#define I460_GXBCTL_BWC (1UL << 2) - -/* - * gatt_table entries are 32-bits wide on the i460; the generic code ought to declare the - * gatt_table and gatt_table_real pointers a "void *"... - */ -#define RD_GATT(index) readl((u32 *) i460.gatt + (index)) -#define WR_GATT(index, val) writel((val), (u32 *) i460.gatt + (index)) -/* - * The 460 spec says we have to read the last location written to make sure that all - * writes have taken effect - */ -#define WR_FLUSH_GATT(index) RD_GATT(index) - -static unsigned long i460_mask_memory (struct agp_bridge_data *bridge, - dma_addr_t addr, int type); - -static struct { - void *gatt; /* ioremap'd GATT area */ - - /* i460 supports multiple GART page sizes, so GART pageshift is dynamic: */ - u8 io_page_shift; - - /* BIOS configures chipset to one of 2 possible apbase values: */ - u8 dynamic_apbase; - - /* structure for tracking partial use of 4MB GART pages: */ - struct lp_desc { - unsigned long *alloced_map; /* bitmap of kernel-pages in use */ - int refcount; /* number of kernel pages using the large page */ - u64 paddr; /* physical address of large page */ - struct page *page; /* page pointer */ - } *lp_desc; -} i460; - -static const struct aper_size_info_8 i460_sizes[3] = -{ - /* - * The 32GB aperture is only available with a 4M GART page size. Due to the - * dynamic GART page size, we can't figure out page_order or num_entries until - * runtime. - */ - {32768, 0, 0, 4}, - {1024, 0, 0, 2}, - {256, 0, 0, 1} -}; - -static struct gatt_mask i460_masks[] = -{ - { - .mask = INTEL_I460_GATT_VALID | INTEL_I460_GATT_COHERENT, - .type = 0 - } -}; - -static int i460_fetch_size (void) -{ - int i; - u8 temp; - struct aper_size_info_8 *values; - - /* Determine the GART page size */ - pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &temp); - i460.io_page_shift = (temp & I460_4M_PS) ? 22 : 12; - pr_debug("i460_fetch_size: io_page_shift=%d\n", i460.io_page_shift); - - if (i460.io_page_shift != I460_IO_PAGE_SHIFT) { - printk(KERN_ERR PFX - "I/O (GART) page-size %luKB doesn't match expected " - "size %luKB\n", - 1UL << (i460.io_page_shift - 10), - 1UL << (I460_IO_PAGE_SHIFT)); - return 0; - } - - values = A_SIZE_8(agp_bridge->driver->aperture_sizes); - - pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp); - - /* Exit now if the IO drivers for the GART SRAMS are turned off */ - if (temp & I460_SRAM_IO_DISABLE) { - printk(KERN_ERR PFX "GART SRAMS disabled on 460GX chipset\n"); - printk(KERN_ERR PFX "AGPGART operation not possible\n"); - return 0; - } - - /* Make sure we don't try to create an 2 ^ 23 entry GATT */ - if ((i460.io_page_shift == 0) && ((temp & I460_AGPSIZ_MASK) == 4)) { - printk(KERN_ERR PFX "We can't have a 32GB aperture with 4KB GART pages\n"); - return 0; - } - - /* Determine the proper APBASE register */ - if (temp & I460_BAPBASE_ENABLE) - i460.dynamic_apbase = INTEL_I460_BAPBASE; - else - i460.dynamic_apbase = AGP_APBASE; - - for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) { - /* - * Dynamically calculate the proper num_entries and page_order values for - * the define aperture sizes. Take care not to shift off the end of - * values[i].size. - */ - values[i].num_entries = (values[i].size << 8) >> (I460_IO_PAGE_SHIFT - 12); - values[i].page_order = ilog2((sizeof(u32)*values[i].num_entries) >> PAGE_SHIFT); - } - - for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) { - /* Neglect control bits when matching up size_value */ - if ((temp & I460_AGPSIZ_MASK) == values[i].size_value) { - agp_bridge->previous_size = agp_bridge->current_size = (void *) (values + i); - agp_bridge->aperture_size_idx = i; - return values[i].size; - } - } - - return 0; -} - -/* There isn't anything to do here since 460 has no GART TLB. */ -static void i460_tlb_flush (struct agp_memory *mem) -{ - return; -} - -/* - * This utility function is needed to prevent corruption of the control bits - * which are stored along with the aperture size in 460's AGPSIZ register - */ -static void i460_write_agpsiz (u8 size_value) -{ - u8 temp; - - pci_read_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, &temp); - pci_write_config_byte(agp_bridge->dev, INTEL_I460_AGPSIZ, - ((temp & ~I460_AGPSIZ_MASK) | size_value)); -} - -static void i460_cleanup (void) -{ - struct aper_size_info_8 *previous_size; - - previous_size = A_SIZE_8(agp_bridge->previous_size); - i460_write_agpsiz(previous_size->size_value); - - if (I460_IO_PAGE_SHIFT > PAGE_SHIFT) - kfree(i460.lp_desc); -} - -static int i460_configure (void) -{ - union { - u32 small[2]; - u64 large; - } temp; - size_t size; - u8 scratch; - struct aper_size_info_8 *current_size; - - temp.large = 0; - - current_size = A_SIZE_8(agp_bridge->current_size); - i460_write_agpsiz(current_size->size_value); - - /* - * Do the necessary rigmarole to read all eight bytes of APBASE. - * This has to be done since the AGP aperture can be above 4GB on - * 460 based systems. - */ - pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase, &(temp.small[0])); - pci_read_config_dword(agp_bridge->dev, i460.dynamic_apbase + 4, &(temp.small[1])); - - /* Clear BAR control bits */ - agp_bridge->gart_bus_addr = temp.large & ~((1UL << 3) - 1); - - pci_read_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, &scratch); - pci_write_config_byte(agp_bridge->dev, INTEL_I460_GXBCTL, - (scratch & 0x02) | I460_GXBCTL_OOG | I460_GXBCTL_BWC); - - /* - * Initialize partial allocation trackers if a GART page is bigger than a kernel - * page. - */ - if (I460_IO_PAGE_SHIFT > PAGE_SHIFT) { - size = current_size->num_entries * sizeof(i460.lp_desc[0]); - i460.lp_desc = kzalloc(size, GFP_KERNEL); - if (!i460.lp_desc) - return -ENOMEM; - } - return 0; -} - -static int i460_create_gatt_table (struct agp_bridge_data *bridge) -{ - int page_order, num_entries, i; - void *temp; - - /* - * Load up the fixed address of the GART SRAMS which hold our GATT table. - */ - temp = agp_bridge->current_size; - page_order = A_SIZE_8(temp)->page_order; - num_entries = A_SIZE_8(temp)->num_entries; - - i460.gatt = ioremap(INTEL_I460_ATTBASE, PAGE_SIZE << page_order); - if (!i460.gatt) { - printk(KERN_ERR PFX "ioremap failed\n"); - return -ENOMEM; - } - - /* These are no good, the should be removed from the agp_bridge strucure... */ - agp_bridge->gatt_table_real = NULL; - agp_bridge->gatt_table = NULL; - agp_bridge->gatt_bus_addr = 0; - - for (i = 0; i < num_entries; ++i) - WR_GATT(i, 0); - WR_FLUSH_GATT(i - 1); - return 0; -} - -static int i460_free_gatt_table (struct agp_bridge_data *bridge) -{ - int num_entries, i; - void *temp; - - temp = agp_bridge->current_size; - - num_entries = A_SIZE_8(temp)->num_entries; - - for (i = 0; i < num_entries; ++i) - WR_GATT(i, 0); - WR_FLUSH_GATT(num_entries - 1); - - iounmap(i460.gatt); - return 0; -} - -/* - * The following functions are called when the I/O (GART) page size is smaller than - * PAGE_SIZE. - */ - -static int i460_insert_memory_small_io_page (struct agp_memory *mem, - off_t pg_start, int type) -{ - unsigned long paddr, io_pg_start, io_page_size; - int i, j, k, num_entries; - void *temp; - - pr_debug("i460_insert_memory_small_io_page(mem=%p, pg_start=%ld, type=%d, paddr0=0x%lx)\n", - mem, pg_start, type, page_to_phys(mem->pages[0])); - - if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) - return -EINVAL; - - io_pg_start = I460_IOPAGES_PER_KPAGE * pg_start; - - temp = agp_bridge->current_size; - num_entries = A_SIZE_8(temp)->num_entries; - - if ((io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count) > num_entries) { - printk(KERN_ERR PFX "Looks like we're out of AGP memory\n"); - return -EINVAL; - } - - j = io_pg_start; - while (j < (io_pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count)) { - if (!PGE_EMPTY(agp_bridge, RD_GATT(j))) { - pr_debug("i460_insert_memory_small_io_page: GATT[%d]=0x%x is busy\n", - j, RD_GATT(j)); - return -EBUSY; - } - j++; - } - - io_page_size = 1UL << I460_IO_PAGE_SHIFT; - for (i = 0, j = io_pg_start; i < mem->page_count; i++) { - paddr = page_to_phys(mem->pages[i]); - for (k = 0; k < I460_IOPAGES_PER_KPAGE; k++, j++, paddr += io_page_size) - WR_GATT(j, i460_mask_memory(agp_bridge, paddr, mem->type)); - } - WR_FLUSH_GATT(j - 1); - return 0; -} - -static int i460_remove_memory_small_io_page(struct agp_memory *mem, - off_t pg_start, int type) -{ - int i; - - pr_debug("i460_remove_memory_small_io_page(mem=%p, pg_start=%ld, type=%d)\n", - mem, pg_start, type); - - pg_start = I460_IOPAGES_PER_KPAGE * pg_start; - - for (i = pg_start; i < (pg_start + I460_IOPAGES_PER_KPAGE * mem->page_count); i++) - WR_GATT(i, 0); - WR_FLUSH_GATT(i - 1); - return 0; -} - -#if I460_LARGE_IO_PAGES - -/* - * These functions are called when the I/O (GART) page size exceeds PAGE_SIZE. - * - * This situation is interesting since AGP memory allocations that are smaller than a - * single GART page are possible. The i460.lp_desc array tracks partial allocation of the - * large GART pages to work around this issue. - * - * i460.lp_desc[pg_num].refcount tracks the number of kernel pages in use within GART page - * pg_num. i460.lp_desc[pg_num].paddr is the physical address of the large page and - * i460.lp_desc[pg_num].alloced_map is a bitmap of kernel pages that are in use (allocated). - */ - -static int i460_alloc_large_page (struct lp_desc *lp) -{ - unsigned long order = I460_IO_PAGE_SHIFT - PAGE_SHIFT; - size_t map_size; - - lp->page = alloc_pages(GFP_KERNEL, order); - if (!lp->page) { - printk(KERN_ERR PFX "Couldn't alloc 4M GART page...\n"); - return -ENOMEM; - } - - map_size = ((I460_KPAGES_PER_IOPAGE + BITS_PER_LONG - 1) & -BITS_PER_LONG)/8; - lp->alloced_map = kzalloc(map_size, GFP_KERNEL); - if (!lp->alloced_map) { - __free_pages(lp->page, order); - printk(KERN_ERR PFX "Out of memory, we're in trouble...\n"); - return -ENOMEM; - } - - lp->paddr = page_to_phys(lp->page); - lp->refcount = 0; - atomic_add(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp); - return 0; -} - -static void i460_free_large_page (struct lp_desc *lp) -{ - kfree(lp->alloced_map); - lp->alloced_map = NULL; - - __free_pages(lp->page, I460_IO_PAGE_SHIFT - PAGE_SHIFT); - atomic_sub(I460_KPAGES_PER_IOPAGE, &agp_bridge->current_memory_agp); -} - -static int i460_insert_memory_large_io_page (struct agp_memory *mem, - off_t pg_start, int type) -{ - int i, start_offset, end_offset, idx, pg, num_entries; - struct lp_desc *start, *end, *lp; - void *temp; - - if (type >= AGP_USER_TYPES || mem->type >= AGP_USER_TYPES) - return -EINVAL; - - temp = agp_bridge->current_size; - num_entries = A_SIZE_8(temp)->num_entries; - - /* Figure out what pg_start means in terms of our large GART pages */ - start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE]; - end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE]; - start_offset = pg_start % I460_KPAGES_PER_IOPAGE; - end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE; - - if (end > i460.lp_desc + num_entries) { - printk(KERN_ERR PFX "Looks like we're out of AGP memory\n"); - return -EINVAL; - } - - /* Check if the requested region of the aperture is free */ - for (lp = start; lp <= end; ++lp) { - if (!lp->alloced_map) - continue; /* OK, the entire large page is available... */ - - for (idx = ((lp == start) ? start_offset : 0); - idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE); - idx++) - { - if (test_bit(idx, lp->alloced_map)) - return -EBUSY; - } - } - - for (lp = start, i = 0; lp <= end; ++lp) { - if (!lp->alloced_map) { - /* Allocate new GART pages... */ - if (i460_alloc_large_page(lp) < 0) - return -ENOMEM; - pg = lp - i460.lp_desc; - WR_GATT(pg, i460_mask_memory(agp_bridge, - lp->paddr, 0)); - WR_FLUSH_GATT(pg); - } - - for (idx = ((lp == start) ? start_offset : 0); - idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE); - idx++, i++) - { - mem->pages[i] = lp->page; - __set_bit(idx, lp->alloced_map); - ++lp->refcount; - } - } - return 0; -} - -static int i460_remove_memory_large_io_page (struct agp_memory *mem, - off_t pg_start, int type) -{ - int i, pg, start_offset, end_offset, idx, num_entries; - struct lp_desc *start, *end, *lp; - void *temp; - - temp = agp_bridge->current_size; - num_entries = A_SIZE_8(temp)->num_entries; - - /* Figure out what pg_start means in terms of our large GART pages */ - start = &i460.lp_desc[pg_start / I460_KPAGES_PER_IOPAGE]; - end = &i460.lp_desc[(pg_start + mem->page_count - 1) / I460_KPAGES_PER_IOPAGE]; - start_offset = pg_start % I460_KPAGES_PER_IOPAGE; - end_offset = (pg_start + mem->page_count - 1) % I460_KPAGES_PER_IOPAGE; - - for (i = 0, lp = start; lp <= end; ++lp) { - for (idx = ((lp == start) ? start_offset : 0); - idx < ((lp == end) ? (end_offset + 1) : I460_KPAGES_PER_IOPAGE); - idx++, i++) - { - mem->pages[i] = NULL; - __clear_bit(idx, lp->alloced_map); - --lp->refcount; - } - - /* Free GART pages if they are unused */ - if (lp->refcount == 0) { - pg = lp - i460.lp_desc; - WR_GATT(pg, 0); - WR_FLUSH_GATT(pg); - i460_free_large_page(lp); - } - } - return 0; -} - -/* Wrapper routines to call the approriate {small_io_page,large_io_page} function */ - -static int i460_insert_memory (struct agp_memory *mem, - off_t pg_start, int type) -{ - if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) - return i460_insert_memory_small_io_page(mem, pg_start, type); - else - return i460_insert_memory_large_io_page(mem, pg_start, type); -} - -static int i460_remove_memory (struct agp_memory *mem, - off_t pg_start, int type) -{ - if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) - return i460_remove_memory_small_io_page(mem, pg_start, type); - else - return i460_remove_memory_large_io_page(mem, pg_start, type); -} - -/* - * If the I/O (GART) page size is bigger than the kernel page size, we don't want to - * allocate memory until we know where it is to be bound in the aperture (a - * multi-kernel-page alloc might fit inside of an already allocated GART page). - * - * Let's just hope nobody counts on the allocated AGP memory being there before bind time - * (I don't think current drivers do)... - */ -static struct page *i460_alloc_page (struct agp_bridge_data *bridge) -{ - void *page; - - if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) { - page = agp_generic_alloc_page(agp_bridge); - } else - /* Returning NULL would cause problems */ - /* AK: really dubious code. */ - page = (void *)~0UL; - return page; -} - -static void i460_destroy_page (struct page *page, int flags) -{ - if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) { - agp_generic_destroy_page(page, flags); - } -} - -#endif /* I460_LARGE_IO_PAGES */ - -static unsigned long i460_mask_memory (struct agp_bridge_data *bridge, - dma_addr_t addr, int type) -{ - /* Make sure the returned address is a valid GATT entry */ - return bridge->driver->masks[0].mask - | (((addr & ~((1 << I460_IO_PAGE_SHIFT) - 1)) & 0xfffff000) >> 12); -} - -const struct agp_bridge_driver intel_i460_driver = { - .owner = THIS_MODULE, - .aperture_sizes = i460_sizes, - .size_type = U8_APER_SIZE, - .num_aperture_sizes = 3, - .configure = i460_configure, - .fetch_size = i460_fetch_size, - .cleanup = i460_cleanup, - .tlb_flush = i460_tlb_flush, - .mask_memory = i460_mask_memory, - .masks = i460_masks, - .agp_enable = agp_generic_enable, - .cache_flush = global_cache_flush, - .create_gatt_table = i460_create_gatt_table, - .free_gatt_table = i460_free_gatt_table, -#if I460_LARGE_IO_PAGES - .insert_memory = i460_insert_memory, - .remove_memory = i460_remove_memory, - .agp_alloc_page = i460_alloc_page, - .agp_destroy_page = i460_destroy_page, -#else - .insert_memory = i460_insert_memory_small_io_page, - .remove_memory = i460_remove_memory_small_io_page, - .agp_alloc_page = agp_generic_alloc_page, - .agp_alloc_pages = agp_generic_alloc_pages, - .agp_destroy_page = agp_generic_destroy_page, - .agp_destroy_pages = agp_generic_destroy_pages, -#endif - .alloc_by_type = agp_generic_alloc_by_type, - .free_by_type = agp_generic_free_by_type, - .agp_type_to_mask_type = agp_generic_type_to_mask_type, - .cant_use_aperture = true, -}; - -static int agp_intel_i460_probe(struct pci_dev *pdev, - const struct pci_device_id *ent) -{ - struct agp_bridge_data *bridge; - u8 cap_ptr; - - cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP); - if (!cap_ptr) - return -ENODEV; - - bridge = agp_alloc_bridge(); - if (!bridge) - return -ENOMEM; - - bridge->driver = &intel_i460_driver; - bridge->dev = pdev; - bridge->capndx = cap_ptr; - - printk(KERN_INFO PFX "Detected Intel 460GX chipset\n"); - - pci_set_drvdata(pdev, bridge); - return agp_add_bridge(bridge); -} - -static void agp_intel_i460_remove(struct pci_dev *pdev) -{ - struct agp_bridge_data *bridge = pci_get_drvdata(pdev); - - agp_remove_bridge(bridge); - agp_put_bridge(bridge); -} - -static struct pci_device_id agp_intel_i460_pci_table[] = { - { - .class = (PCI_CLASS_BRIDGE_HOST << 8), - .class_mask = ~0, - .vendor = PCI_VENDOR_ID_INTEL, - .device = PCI_DEVICE_ID_INTEL_84460GX, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - }, - { } -}; - -MODULE_DEVICE_TABLE(pci, agp_intel_i460_pci_table); - -static struct pci_driver agp_intel_i460_pci_driver = { - .name = "agpgart-intel-i460", - .id_table = agp_intel_i460_pci_table, - .probe = agp_intel_i460_probe, - .remove = agp_intel_i460_remove, -}; - -static int __init agp_intel_i460_init(void) -{ - if (agp_off) - return -EINVAL; - return pci_register_driver(&agp_intel_i460_pci_driver); -} - -static void __exit agp_intel_i460_cleanup(void) -{ - pci_unregister_driver(&agp_intel_i460_pci_driver); -} - -module_init(agp_intel_i460_init); -module_exit(agp_intel_i460_cleanup); - -MODULE_AUTHOR("Chris Ahna <Christopher.J.Ahna@intel.com>"); -MODULE_LICENSE("GPL and additional rights"); |