From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/alpha/kernel/core_titan.c | 802 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 802 insertions(+) create mode 100644 arch/alpha/kernel/core_titan.c (limited to 'arch/alpha/kernel/core_titan.c') diff --git a/arch/alpha/kernel/core_titan.c b/arch/alpha/kernel/core_titan.c new file mode 100644 index 000000000..77f5d68ed --- /dev/null +++ b/arch/alpha/kernel/core_titan.c @@ -0,0 +1,802 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/alpha/kernel/core_titan.c + * + * Code common to all TITAN core logic chips. + */ + +#define __EXTERN_INLINE inline +#include +#include +#undef __EXTERN_INLINE + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "proto.h" +#include "pci_impl.h" + +/* Save Titan configuration data as the console had it set up. */ + +struct +{ + unsigned long wsba[4]; + unsigned long wsm[4]; + unsigned long tba[4]; +} saved_config[4] __attribute__((common)); + +/* + * Is PChip 1 present? No need to query it more than once. + */ +static int titan_pchip1_present; + +/* + * BIOS32-style PCI interface: + */ + +#define DEBUG_CONFIG 0 + +#if DEBUG_CONFIG +# define DBG_CFG(args) printk args +#else +# define DBG_CFG(args) +#endif + + +/* + * Routines to access TIG registers. + */ +static inline volatile unsigned long * +mk_tig_addr(int offset) +{ + return (volatile unsigned long *)(TITAN_TIG_SPACE + (offset << 6)); +} + +static inline u8 +titan_read_tig(int offset, u8 value) +{ + volatile unsigned long *tig_addr = mk_tig_addr(offset); + return (u8)(*tig_addr & 0xff); +} + +static inline void +titan_write_tig(int offset, u8 value) +{ + volatile unsigned long *tig_addr = mk_tig_addr(offset); + *tig_addr = (unsigned long)value; +} + + +/* + * Given a bus, device, and function number, compute resulting + * configuration space address + * accordingly. It is therefore not safe to have concurrent + * invocations to configuration space access routines, but there + * really shouldn't be any need for this. + * + * Note that all config space accesses use Type 1 address format. + * + * Note also that type 1 is determined by non-zero bus number. + * + * Type 1: + * + * 3 3|3 3 2 2|2 2 2 2|2 2 2 2|1 1 1 1|1 1 1 1|1 1 + * 3 2|1 0 9 8|7 6 5 4|3 2 1 0|9 8 7 6|5 4 3 2|1 0 9 8|7 6 5 4|3 2 1 0 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | | | | | | | | | | |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|1| + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * 31:24 reserved + * 23:16 bus number (8 bits = 128 possible buses) + * 15:11 Device number (5 bits) + * 10:8 function number + * 7:2 register number + * + * Notes: + * The function number selects which function of a multi-function device + * (e.g., SCSI and Ethernet). + * + * The register selects a DWORD (32 bit) register offset. Hence it + * doesn't get shifted by 2 bits as we want to "drop" the bottom two + * bits. + */ + +static int +mk_conf_addr(struct pci_bus *pbus, unsigned int device_fn, int where, + unsigned long *pci_addr, unsigned char *type1) +{ + struct pci_controller *hose = pbus->sysdata; + unsigned long addr; + u8 bus = pbus->number; + + DBG_CFG(("mk_conf_addr(bus=%d ,device_fn=0x%x, where=0x%x, " + "pci_addr=0x%p, type1=0x%p)\n", + bus, device_fn, where, pci_addr, type1)); + + if (!pbus->parent) /* No parent means peer PCI bus. */ + bus = 0; + *type1 = (bus != 0); + + addr = (bus << 16) | (device_fn << 8) | where; + addr |= hose->config_space_base; + + *pci_addr = addr; + DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr)); + return 0; +} + +static int +titan_read_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 *value) +{ + unsigned long addr; + unsigned char type1; + + if (mk_conf_addr(bus, devfn, where, &addr, &type1)) + return PCIBIOS_DEVICE_NOT_FOUND; + + switch (size) { + case 1: + *value = __kernel_ldbu(*(vucp)addr); + break; + case 2: + *value = __kernel_ldwu(*(vusp)addr); + break; + case 4: + *value = *(vuip)addr; + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +static int +titan_write_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 value) +{ + unsigned long addr; + unsigned char type1; + + if (mk_conf_addr(bus, devfn, where, &addr, &type1)) + return PCIBIOS_DEVICE_NOT_FOUND; + + switch (size) { + case 1: + __kernel_stb(value, *(vucp)addr); + mb(); + __kernel_ldbu(*(vucp)addr); + break; + case 2: + __kernel_stw(value, *(vusp)addr); + mb(); + __kernel_ldwu(*(vusp)addr); + break; + case 4: + *(vuip)addr = value; + mb(); + *(vuip)addr; + break; + } + + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops titan_pci_ops = +{ + .read = titan_read_config, + .write = titan_write_config, +}; + + +void +titan_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end) +{ + titan_pachip *pachip = + (hose->index & 1) ? TITAN_pachip1 : TITAN_pachip0; + titan_pachip_port *port; + volatile unsigned long *csr; + unsigned long value; + + /* Get the right hose. */ + port = &pachip->g_port; + if (hose->index & 2) + port = &pachip->a_port; + + /* We can invalidate up to 8 tlb entries in a go. The flush + matches against <31:16> in the pci address. + Note that gtlbi* and atlbi* are in the same place in the g_port + and a_port, respectively, so the g_port offset can be used + even if hose is an a_port */ + csr = &port->port_specific.g.gtlbia.csr; + if (((start ^ end) & 0xffff0000) == 0) + csr = &port->port_specific.g.gtlbiv.csr; + + /* For TBIA, it doesn't matter what value we write. For TBI, + it's the shifted tag bits. */ + value = (start & 0xffff0000) >> 12; + + wmb(); + *csr = value; + mb(); + *csr; +} + +static int +titan_query_agp(titan_pachip_port *port) +{ + union TPAchipPCTL pctl; + + /* set up APCTL */ + pctl.pctl_q_whole = port->pctl.csr; + + return pctl.pctl_r_bits.apctl_v_agp_present; + +} + +static void __init +titan_init_one_pachip_port(titan_pachip_port *port, int index) +{ + struct pci_controller *hose; + + hose = alloc_pci_controller(); + if (index == 0) + pci_isa_hose = hose; + hose->io_space = alloc_resource(); + hose->mem_space = alloc_resource(); + + /* + * This is for userland consumption. The 40-bit PIO bias that we + * use in the kernel through KSEG doesn't work in the page table + * based user mappings. (43-bit KSEG sign extends the physical + * address from bit 40 to hit the I/O bit - mapped addresses don't). + * So make sure we get the 43-bit PIO bias. + */ + hose->sparse_mem_base = 0; + hose->sparse_io_base = 0; + hose->dense_mem_base + = (TITAN_MEM(index) & 0xffffffffffUL) | 0x80000000000UL; + hose->dense_io_base + = (TITAN_IO(index) & 0xffffffffffUL) | 0x80000000000UL; + + hose->config_space_base = TITAN_CONF(index); + hose->index = index; + + hose->io_space->start = TITAN_IO(index) - TITAN_IO_BIAS; + hose->io_space->end = hose->io_space->start + TITAN_IO_SPACE - 1; + hose->io_space->name = pci_io_names[index]; + hose->io_space->flags = IORESOURCE_IO; + + hose->mem_space->start = TITAN_MEM(index) - TITAN_MEM_BIAS; + hose->mem_space->end = hose->mem_space->start + 0xffffffff; + hose->mem_space->name = pci_mem_names[index]; + hose->mem_space->flags = IORESOURCE_MEM; + + if (request_resource(&ioport_resource, hose->io_space) < 0) + printk(KERN_ERR "Failed to request IO on hose %d\n", index); + if (request_resource(&iomem_resource, hose->mem_space) < 0) + printk(KERN_ERR "Failed to request MEM on hose %d\n", index); + + /* + * Save the existing PCI window translations. SRM will + * need them when we go to reboot. + */ + saved_config[index].wsba[0] = port->wsba[0].csr; + saved_config[index].wsm[0] = port->wsm[0].csr; + saved_config[index].tba[0] = port->tba[0].csr; + + saved_config[index].wsba[1] = port->wsba[1].csr; + saved_config[index].wsm[1] = port->wsm[1].csr; + saved_config[index].tba[1] = port->tba[1].csr; + + saved_config[index].wsba[2] = port->wsba[2].csr; + saved_config[index].wsm[2] = port->wsm[2].csr; + saved_config[index].tba[2] = port->tba[2].csr; + + saved_config[index].wsba[3] = port->wsba[3].csr; + saved_config[index].wsm[3] = port->wsm[3].csr; + saved_config[index].tba[3] = port->tba[3].csr; + + /* + * Set up the PCI to main memory translation windows. + * + * Note: Window 3 on Titan is Scatter-Gather ONLY. + * + * Window 0 is scatter-gather 8MB at 8MB (for isa) + * Window 1 is direct access 1GB at 2GB + * Window 2 is scatter-gather 1GB at 3GB + */ + hose->sg_isa = iommu_arena_new(hose, 0x00800000, 0x00800000, + SMP_CACHE_BYTES); + hose->sg_isa->align_entry = 8; /* 64KB for ISA */ + + hose->sg_pci = iommu_arena_new(hose, 0xc0000000, 0x40000000, + SMP_CACHE_BYTES); + hose->sg_pci->align_entry = 4; /* Titan caches 4 PTEs at a time */ + + port->wsba[0].csr = hose->sg_isa->dma_base | 3; + port->wsm[0].csr = (hose->sg_isa->size - 1) & 0xfff00000; + port->tba[0].csr = virt_to_phys(hose->sg_isa->ptes); + + port->wsba[1].csr = __direct_map_base | 1; + port->wsm[1].csr = (__direct_map_size - 1) & 0xfff00000; + port->tba[1].csr = 0; + + port->wsba[2].csr = hose->sg_pci->dma_base | 3; + port->wsm[2].csr = (hose->sg_pci->size - 1) & 0xfff00000; + port->tba[2].csr = virt_to_phys(hose->sg_pci->ptes); + + port->wsba[3].csr = 0; + + /* Enable the Monster Window to make DAC pci64 possible. */ + port->pctl.csr |= pctl_m_mwin; + + /* + * If it's an AGP port, initialize agplastwr. + */ + if (titan_query_agp(port)) + port->port_specific.a.agplastwr.csr = __direct_map_base; + + titan_pci_tbi(hose, 0, -1); +} + +static void __init +titan_init_pachips(titan_pachip *pachip0, titan_pachip *pachip1) +{ + titan_pchip1_present = TITAN_cchip->csc.csr & 1L<<14; + + /* Init the ports in hose order... */ + titan_init_one_pachip_port(&pachip0->g_port, 0); /* hose 0 */ + if (titan_pchip1_present) + titan_init_one_pachip_port(&pachip1->g_port, 1);/* hose 1 */ + titan_init_one_pachip_port(&pachip0->a_port, 2); /* hose 2 */ + if (titan_pchip1_present) + titan_init_one_pachip_port(&pachip1->a_port, 3);/* hose 3 */ +} + +void __init +titan_init_arch(void) +{ +#if 0 + printk("%s: titan_init_arch()\n", __func__); + printk("%s: CChip registers:\n", __func__); + printk("%s: CSR_CSC 0x%lx\n", __func__, TITAN_cchip->csc.csr); + printk("%s: CSR_MTR 0x%lx\n", __func__, TITAN_cchip->mtr.csr); + printk("%s: CSR_MISC 0x%lx\n", __func__, TITAN_cchip->misc.csr); + printk("%s: CSR_DIM0 0x%lx\n", __func__, TITAN_cchip->dim0.csr); + printk("%s: CSR_DIM1 0x%lx\n", __func__, TITAN_cchip->dim1.csr); + printk("%s: CSR_DIR0 0x%lx\n", __func__, TITAN_cchip->dir0.csr); + printk("%s: CSR_DIR1 0x%lx\n", __func__, TITAN_cchip->dir1.csr); + printk("%s: CSR_DRIR 0x%lx\n", __func__, TITAN_cchip->drir.csr); + + printk("%s: DChip registers:\n", __func__); + printk("%s: CSR_DSC 0x%lx\n", __func__, TITAN_dchip->dsc.csr); + printk("%s: CSR_STR 0x%lx\n", __func__, TITAN_dchip->str.csr); + printk("%s: CSR_DREV 0x%lx\n", __func__, TITAN_dchip->drev.csr); +#endif + + boot_cpuid = __hard_smp_processor_id(); + + /* With multiple PCI busses, we play with I/O as physical addrs. */ + ioport_resource.end = ~0UL; + iomem_resource.end = ~0UL; + + /* PCI DMA Direct Mapping is 1GB at 2GB. */ + __direct_map_base = 0x80000000; + __direct_map_size = 0x40000000; + + /* Init the PA chip(s). */ + titan_init_pachips(TITAN_pachip0, TITAN_pachip1); + + /* Check for graphic console location (if any). */ + find_console_vga_hose(); +} + +static void +titan_kill_one_pachip_port(titan_pachip_port *port, int index) +{ + port->wsba[0].csr = saved_config[index].wsba[0]; + port->wsm[0].csr = saved_config[index].wsm[0]; + port->tba[0].csr = saved_config[index].tba[0]; + + port->wsba[1].csr = saved_config[index].wsba[1]; + port->wsm[1].csr = saved_config[index].wsm[1]; + port->tba[1].csr = saved_config[index].tba[1]; + + port->wsba[2].csr = saved_config[index].wsba[2]; + port->wsm[2].csr = saved_config[index].wsm[2]; + port->tba[2].csr = saved_config[index].tba[2]; + + port->wsba[3].csr = saved_config[index].wsba[3]; + port->wsm[3].csr = saved_config[index].wsm[3]; + port->tba[3].csr = saved_config[index].tba[3]; +} + +static void +titan_kill_pachips(titan_pachip *pachip0, titan_pachip *pachip1) +{ + if (titan_pchip1_present) { + titan_kill_one_pachip_port(&pachip1->g_port, 1); + titan_kill_one_pachip_port(&pachip1->a_port, 3); + } + titan_kill_one_pachip_port(&pachip0->g_port, 0); + titan_kill_one_pachip_port(&pachip0->a_port, 2); +} + +void +titan_kill_arch(int mode) +{ + titan_kill_pachips(TITAN_pachip0, TITAN_pachip1); +} + + +/* + * IO map support. + */ + +void __iomem * +titan_ioportmap(unsigned long addr) +{ + FIXUP_IOADDR_VGA(addr); + return (void __iomem *)(addr + TITAN_IO_BIAS); +} + + +void __iomem * +titan_ioremap(unsigned long addr, unsigned long size) +{ + int h = (addr & TITAN_HOSE_MASK) >> TITAN_HOSE_SHIFT; + unsigned long baddr = addr & ~TITAN_HOSE_MASK; + unsigned long last = baddr + size - 1; + struct pci_controller *hose; + struct vm_struct *area; + unsigned long vaddr; + unsigned long *ptes; + unsigned long pfn; + +#ifdef CONFIG_VGA_HOSE + /* + * Adjust the address and hose, if necessary. + */ + if (pci_vga_hose && __is_mem_vga(addr)) { + h = pci_vga_hose->index; + addr += pci_vga_hose->mem_space->start; + } +#endif + + /* + * Find the hose. + */ + for (hose = hose_head; hose; hose = hose->next) + if (hose->index == h) + break; + if (!hose) + return NULL; + + /* + * Is it direct-mapped? + */ + if ((baddr >= __direct_map_base) && + ((baddr + size - 1) < __direct_map_base + __direct_map_size)) { + vaddr = addr - __direct_map_base + TITAN_MEM_BIAS; + return (void __iomem *) vaddr; + } + + /* + * Check the scatter-gather arena. + */ + if (hose->sg_pci && + baddr >= (unsigned long)hose->sg_pci->dma_base && + last < (unsigned long)hose->sg_pci->dma_base + hose->sg_pci->size){ + + /* + * Adjust the limits (mappings must be page aligned) + */ + baddr -= hose->sg_pci->dma_base; + last -= hose->sg_pci->dma_base; + baddr &= PAGE_MASK; + size = PAGE_ALIGN(last) - baddr; + + /* + * Map it + */ + area = get_vm_area(size, VM_IOREMAP); + if (!area) { + printk("ioremap failed... no vm_area...\n"); + return NULL; + } + + ptes = hose->sg_pci->ptes; + for (vaddr = (unsigned long)area->addr; + baddr <= last; + baddr += PAGE_SIZE, vaddr += PAGE_SIZE) { + pfn = ptes[baddr >> PAGE_SHIFT]; + if (!(pfn & 1)) { + printk("ioremap failed... pte not valid...\n"); + vfree(area->addr); + return NULL; + } + pfn >>= 1; /* make it a true pfn */ + + if (__alpha_remap_area_pages(vaddr, + pfn << PAGE_SHIFT, + PAGE_SIZE, 0)) { + printk("FAILED to remap_area_pages...\n"); + vfree(area->addr); + return NULL; + } + } + + flush_tlb_all(); + + vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK); + return (void __iomem *) vaddr; + } + + /* Assume a legacy (read: VGA) address, and return appropriately. */ + return (void __iomem *)(addr + TITAN_MEM_BIAS); +} + +void +titan_iounmap(volatile void __iomem *xaddr) +{ + unsigned long addr = (unsigned long) xaddr; + if (addr >= VMALLOC_START) + vfree((void *)(PAGE_MASK & addr)); +} + +int +titan_is_mmio(const volatile void __iomem *xaddr) +{ + unsigned long addr = (unsigned long) xaddr; + + if (addr >= VMALLOC_START) + return 1; + else + return (addr & 0x100000000UL) == 0; +} + +#ifndef CONFIG_ALPHA_GENERIC +EXPORT_SYMBOL(titan_ioportmap); +EXPORT_SYMBOL(titan_ioremap); +EXPORT_SYMBOL(titan_iounmap); +EXPORT_SYMBOL(titan_is_mmio); +#endif + +/* + * AGP GART Support. + */ +#include +#include +#include +#include + +struct titan_agp_aperture { + struct pci_iommu_arena *arena; + long pg_start; + long pg_count; +}; + +static int +titan_agp_setup(alpha_agp_info *agp) +{ + struct titan_agp_aperture *aper; + + if (!alpha_agpgart_size) + return -ENOMEM; + + aper = kmalloc(sizeof(struct titan_agp_aperture), GFP_KERNEL); + if (aper == NULL) + return -ENOMEM; + + aper->arena = agp->hose->sg_pci; + aper->pg_count = alpha_agpgart_size / PAGE_SIZE; + aper->pg_start = iommu_reserve(aper->arena, aper->pg_count, + aper->pg_count - 1); + if (aper->pg_start < 0) { + printk(KERN_ERR "Failed to reserve AGP memory\n"); + kfree(aper); + return -ENOMEM; + } + + agp->aperture.bus_base = + aper->arena->dma_base + aper->pg_start * PAGE_SIZE; + agp->aperture.size = aper->pg_count * PAGE_SIZE; + agp->aperture.sysdata = aper; + + return 0; +} + +static void +titan_agp_cleanup(alpha_agp_info *agp) +{ + struct titan_agp_aperture *aper = agp->aperture.sysdata; + int status; + + status = iommu_release(aper->arena, aper->pg_start, aper->pg_count); + if (status == -EBUSY) { + printk(KERN_WARNING + "Attempted to release bound AGP memory - unbinding\n"); + iommu_unbind(aper->arena, aper->pg_start, aper->pg_count); + status = iommu_release(aper->arena, aper->pg_start, + aper->pg_count); + } + if (status < 0) + printk(KERN_ERR "Failed to release AGP memory\n"); + + kfree(aper); + kfree(agp); +} + +static int +titan_agp_configure(alpha_agp_info *agp) +{ + union TPAchipPCTL pctl; + titan_pachip_port *port = agp->private; + pctl.pctl_q_whole = port->pctl.csr; + + /* Side-Band Addressing? */ + pctl.pctl_r_bits.apctl_v_agp_sba_en = agp->mode.bits.sba; + + /* AGP Rate? */ + pctl.pctl_r_bits.apctl_v_agp_rate = 0; /* 1x */ + if (agp->mode.bits.rate & 2) + pctl.pctl_r_bits.apctl_v_agp_rate = 1; /* 2x */ +#if 0 + if (agp->mode.bits.rate & 4) + pctl.pctl_r_bits.apctl_v_agp_rate = 2; /* 4x */ +#endif + + /* RQ Depth? */ + pctl.pctl_r_bits.apctl_v_agp_hp_rd = 2; + pctl.pctl_r_bits.apctl_v_agp_lp_rd = 7; + + /* + * AGP Enable. + */ + pctl.pctl_r_bits.apctl_v_agp_en = agp->mode.bits.enable; + + /* Tell the user. */ + printk("Enabling AGP: %dX%s\n", + 1 << pctl.pctl_r_bits.apctl_v_agp_rate, + pctl.pctl_r_bits.apctl_v_agp_sba_en ? " - SBA" : ""); + + /* Write it. */ + port->pctl.csr = pctl.pctl_q_whole; + + /* And wait at least 5000 66MHz cycles (per Titan spec). */ + udelay(100); + + return 0; +} + +static int +titan_agp_bind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem) +{ + struct titan_agp_aperture *aper = agp->aperture.sysdata; + return iommu_bind(aper->arena, aper->pg_start + pg_start, + mem->page_count, mem->pages); +} + +static int +titan_agp_unbind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem) +{ + struct titan_agp_aperture *aper = agp->aperture.sysdata; + return iommu_unbind(aper->arena, aper->pg_start + pg_start, + mem->page_count); +} + +static unsigned long +titan_agp_translate(alpha_agp_info *agp, dma_addr_t addr) +{ + struct titan_agp_aperture *aper = agp->aperture.sysdata; + unsigned long baddr = addr - aper->arena->dma_base; + unsigned long pte; + + if (addr < agp->aperture.bus_base || + addr >= agp->aperture.bus_base + agp->aperture.size) { + printk("%s: addr out of range\n", __func__); + return -EINVAL; + } + + pte = aper->arena->ptes[baddr >> PAGE_SHIFT]; + if (!(pte & 1)) { + printk("%s: pte not valid\n", __func__); + return -EINVAL; + } + + return (pte >> 1) << PAGE_SHIFT; +} + +struct alpha_agp_ops titan_agp_ops = +{ + .setup = titan_agp_setup, + .cleanup = titan_agp_cleanup, + .configure = titan_agp_configure, + .bind = titan_agp_bind_memory, + .unbind = titan_agp_unbind_memory, + .translate = titan_agp_translate +}; + +alpha_agp_info * +titan_agp_info(void) +{ + alpha_agp_info *agp; + struct pci_controller *hose; + titan_pachip_port *port; + int hosenum = -1; + union TPAchipPCTL pctl; + + /* + * Find the AGP port. + */ + port = &TITAN_pachip0->a_port; + if (titan_query_agp(port)) + hosenum = 2; + if (hosenum < 0 && + titan_pchip1_present && + titan_query_agp(port = &TITAN_pachip1->a_port)) + hosenum = 3; + + /* + * Find the hose the port is on. + */ + for (hose = hose_head; hose; hose = hose->next) + if (hose->index == hosenum) + break; + + if (!hose || !hose->sg_pci) + return NULL; + + /* + * Allocate the info structure. + */ + agp = kmalloc(sizeof(*agp), GFP_KERNEL); + if (!agp) + return NULL; + + /* + * Fill it in. + */ + agp->hose = hose; + agp->private = port; + agp->ops = &titan_agp_ops; + + /* + * Aperture - not configured until ops.setup(). + * + * FIXME - should we go ahead and allocate it here? + */ + agp->aperture.bus_base = 0; + agp->aperture.size = 0; + agp->aperture.sysdata = NULL; + + /* + * Capabilities. + */ + agp->capability.lw = 0; + agp->capability.bits.rate = 3; /* 2x, 1x */ + agp->capability.bits.sba = 1; + agp->capability.bits.rq = 7; /* 8 - 1 */ + + /* + * Mode. + */ + pctl.pctl_q_whole = port->pctl.csr; + agp->mode.lw = 0; + agp->mode.bits.rate = 1 << pctl.pctl_r_bits.apctl_v_agp_rate; + agp->mode.bits.sba = pctl.pctl_r_bits.apctl_v_agp_sba_en; + agp->mode.bits.rq = 7; /* RQ Depth? */ + agp->mode.bits.enable = pctl.pctl_r_bits.apctl_v_agp_en; + + return agp; +} -- cgit v1.2.3