Revision 140d0b2108faebc77c6523296e211e509cb9f5f9 authored by Linus Torvalds on 05 August 2011, 05:35:59 UTC, committed by Linus Torvalds on 05 August 2011, 05:35:59 UTC
This isn't really critical any more, since other patches (commit 298507d4d2cf: "shm: optimize exit_shm()") have caused us to not actually need to touch the rw_mutex unless there are actual shm segments associated with the namespace, but we really should do tne shm_init_ns() earlier than we do now. This, together with commit 288d5abec831 ("Boot up with usermodehelper disabled") will mean that we really do initialize the initial ipc namespace data structure before we run any tasks. Tested-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 24f0eed
core_marvel.c
/*
* linux/arch/alpha/kernel/core_marvel.c
*
* Code common to all Marvel based systems.
*/
#define __EXTERN_INLINE inline
#include <asm/io.h>
#include <asm/core_marvel.h>
#undef __EXTERN_INLINE
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/mc146818rtc.h>
#include <linux/rtc.h>
#include <linux/module.h>
#include <linux/bootmem.h>
#include <asm/ptrace.h>
#include <asm/smp.h>
#include <asm/gct.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/rtc.h>
#include <asm/vga.h>
#include "proto.h"
#include "pci_impl.h"
/*
* Debug helpers
*/
#define DEBUG_CONFIG 0
#if DEBUG_CONFIG
# define DBG_CFG(args) printk args
#else
# define DBG_CFG(args)
#endif
/*
* Private data
*/
static struct io7 *io7_head = NULL;
/*
* Helper functions
*/
static unsigned long __attribute__ ((unused))
read_ev7_csr(int pe, unsigned long offset)
{
ev7_csr *ev7csr = EV7_CSR_KERN(pe, offset);
unsigned long q;
mb();
q = ev7csr->csr;
mb();
return q;
}
static void __attribute__ ((unused))
write_ev7_csr(int pe, unsigned long offset, unsigned long q)
{
ev7_csr *ev7csr = EV7_CSR_KERN(pe, offset);
mb();
ev7csr->csr = q;
mb();
}
static char * __init
mk_resource_name(int pe, int port, char *str)
{
char tmp[80];
char *name;
sprintf(tmp, "PCI %s PE %d PORT %d", str, pe, port);
name = alloc_bootmem(strlen(tmp) + 1);
strcpy(name, tmp);
return name;
}
inline struct io7 *
marvel_next_io7(struct io7 *prev)
{
return (prev ? prev->next : io7_head);
}
struct io7 *
marvel_find_io7(int pe)
{
struct io7 *io7;
for (io7 = io7_head; io7 && io7->pe != pe; io7 = io7->next)
continue;
return io7;
}
static struct io7 * __init
alloc_io7(unsigned int pe)
{
struct io7 *io7;
struct io7 *insp;
int h;
if (marvel_find_io7(pe)) {
printk(KERN_WARNING "IO7 at PE %d already allocated!\n", pe);
return NULL;
}
io7 = alloc_bootmem(sizeof(*io7));
io7->pe = pe;
spin_lock_init(&io7->irq_lock);
for (h = 0; h < 4; h++) {
io7->ports[h].io7 = io7;
io7->ports[h].port = h;
io7->ports[h].enabled = 0; /* default to disabled */
}
/*
* Insert in pe sorted order.
*/
if (NULL == io7_head) /* empty list */
io7_head = io7;
else if (io7_head->pe > io7->pe) { /* insert at head */
io7->next = io7_head;
io7_head = io7;
} else { /* insert at position */
for (insp = io7_head; insp; insp = insp->next) {
if (insp->pe == io7->pe) {
printk(KERN_ERR "Too many IO7s at PE %d\n",
io7->pe);
return NULL;
}
if (NULL == insp->next ||
insp->next->pe > io7->pe) { /* insert here */
io7->next = insp->next;
insp->next = io7;
break;
}
}
if (NULL == insp) { /* couldn't insert ?!? */
printk(KERN_WARNING "Failed to insert IO7 at PE %d "
" - adding at head of list\n", io7->pe);
io7->next = io7_head;
io7_head = io7;
}
}
return io7;
}
void
io7_clear_errors(struct io7 *io7)
{
io7_port7_csrs *p7csrs;
io7_ioport_csrs *csrs;
int port;
/*
* First the IO ports.
*/
for (port = 0; port < 4; port++) {
csrs = IO7_CSRS_KERN(io7->pe, port);
csrs->POx_ERR_SUM.csr = -1UL;
csrs->POx_TLB_ERR.csr = -1UL;
csrs->POx_SPL_COMPLT.csr = -1UL;
csrs->POx_TRANS_SUM.csr = -1UL;
}
/*
* Then the common ones.
*/
p7csrs = IO7_PORT7_CSRS_KERN(io7->pe);
p7csrs->PO7_ERROR_SUM.csr = -1UL;
p7csrs->PO7_UNCRR_SYM.csr = -1UL;
p7csrs->PO7_CRRCT_SYM.csr = -1UL;
}
/*
* IO7 PCI, PCI/X, AGP configuration.
*/
static void __init
io7_init_hose(struct io7 *io7, int port)
{
static int hose_index = 0;
struct pci_controller *hose = alloc_pci_controller();
struct io7_port *io7_port = &io7->ports[port];
io7_ioport_csrs *csrs = IO7_CSRS_KERN(io7->pe, port);
int i;
hose->index = hose_index++; /* arbitrary */
/*
* We don't have an isa or legacy hose, but glibc expects to be
* able to use the bus == 0 / dev == 0 form of the iobase syscall
* to determine information about the i/o system. Since XFree86
* relies on glibc's determination to tell whether or not to use
* sparse access, we need to point the pci_isa_hose at a real hose
* so at least that determination is correct.
*/
if (hose->index == 0)
pci_isa_hose = hose;
io7_port->csrs = csrs;
io7_port->hose = hose;
hose->sysdata = io7_port;
hose->io_space = alloc_resource();
hose->mem_space = alloc_resource();
/*
* Base addresses for userland consumption. Since these are going
* to be mapped, they are pure physical addresses.
*/
hose->sparse_mem_base = hose->sparse_io_base = 0;
hose->dense_mem_base = IO7_MEM_PHYS(io7->pe, port);
hose->dense_io_base = IO7_IO_PHYS(io7->pe, port);
/*
* Base addresses and resource ranges for kernel consumption.
*/
hose->config_space_base = (unsigned long)IO7_CONF_KERN(io7->pe, port);
hose->io_space->start = (unsigned long)IO7_IO_KERN(io7->pe, port);
hose->io_space->end = hose->io_space->start + IO7_IO_SPACE - 1;
hose->io_space->name = mk_resource_name(io7->pe, port, "IO");
hose->io_space->flags = IORESOURCE_IO;
hose->mem_space->start = (unsigned long)IO7_MEM_KERN(io7->pe, port);
hose->mem_space->end = hose->mem_space->start + IO7_MEM_SPACE - 1;
hose->mem_space->name = mk_resource_name(io7->pe, port, "MEM");
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",
hose->index);
if (request_resource(&iomem_resource, hose->mem_space) < 0)
printk(KERN_ERR "Failed to request MEM on hose %d\n",
hose->index);
/*
* Save the existing DMA window settings for later restoration.
*/
for (i = 0; i < 4; i++) {
io7_port->saved_wbase[i] = csrs->POx_WBASE[i].csr;
io7_port->saved_wmask[i] = csrs->POx_WMASK[i].csr;
io7_port->saved_tbase[i] = csrs->POx_TBASE[i].csr;
}
/*
* Set up the PCI to main memory translation windows.
*
* Window 0 is scatter-gather 8MB at 8MB
* Window 1 is direct access 1GB at 2GB
* Window 2 is scatter-gather (up-to) 1GB at 3GB
* Window 3 is disabled
*/
/*
* TBIA before modifying windows.
*/
marvel_pci_tbi(hose, 0, -1);
/*
* Set up window 0 for scatter-gather 8MB at 8MB.
*/
hose->sg_isa = iommu_arena_new_node(marvel_cpuid_to_nid(io7->pe),
hose, 0x00800000, 0x00800000, 0);
hose->sg_isa->align_entry = 8; /* cache line boundary */
csrs->POx_WBASE[0].csr =
hose->sg_isa->dma_base | wbase_m_ena | wbase_m_sg;
csrs->POx_WMASK[0].csr = (hose->sg_isa->size - 1) & wbase_m_addr;
csrs->POx_TBASE[0].csr = virt_to_phys(hose->sg_isa->ptes);
/*
* Set up window 1 for direct-mapped 1GB at 2GB.
*/
csrs->POx_WBASE[1].csr = __direct_map_base | wbase_m_ena;
csrs->POx_WMASK[1].csr = (__direct_map_size - 1) & wbase_m_addr;
csrs->POx_TBASE[1].csr = 0;
/*
* Set up window 2 for scatter-gather (up-to) 1GB at 3GB.
*/
hose->sg_pci = iommu_arena_new_node(marvel_cpuid_to_nid(io7->pe),
hose, 0xc0000000, 0x40000000, 0);
hose->sg_pci->align_entry = 8; /* cache line boundary */
csrs->POx_WBASE[2].csr =
hose->sg_pci->dma_base | wbase_m_ena | wbase_m_sg;
csrs->POx_WMASK[2].csr = (hose->sg_pci->size - 1) & wbase_m_addr;
csrs->POx_TBASE[2].csr = virt_to_phys(hose->sg_pci->ptes);
/*
* Disable window 3.
*/
csrs->POx_WBASE[3].csr = 0;
/*
* Make sure that the AGP Monster Window is disabled.
*/
csrs->POx_CTRL.csr &= ~(1UL << 61);
#if 1
printk("FIXME: disabling master aborts\n");
csrs->POx_MSK_HEI.csr &= ~(3UL << 14);
#endif
/*
* TBIA after modifying windows.
*/
marvel_pci_tbi(hose, 0, -1);
}
static void __init
marvel_init_io7(struct io7 *io7)
{
int i;
printk("Initializing IO7 at PID %d\n", io7->pe);
/*
* Get the Port 7 CSR pointer.
*/
io7->csrs = IO7_PORT7_CSRS_KERN(io7->pe);
/*
* Init this IO7's hoses.
*/
for (i = 0; i < IO7_NUM_PORTS; i++) {
io7_ioport_csrs *csrs = IO7_CSRS_KERN(io7->pe, i);
if (csrs->POx_CACHE_CTL.csr == 8) {
io7->ports[i].enabled = 1;
io7_init_hose(io7, i);
}
}
}
void
marvel_io7_present(gct6_node *node)
{
int pe;
if (node->type != GCT_TYPE_HOSE ||
node->subtype != GCT_SUBTYPE_IO_PORT_MODULE)
return;
pe = (node->id >> 8) & 0xff;
printk("Found an IO7 at PID %d\n", pe);
alloc_io7(pe);
}
static void __init
marvel_find_console_vga_hose(void)
{
u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
if (pu64[7] == 3) { /* TERM_TYPE == graphics */
struct pci_controller *hose = NULL;
int h = (pu64[30] >> 24) & 0xff; /* TERM_OUT_LOC, hose # */
struct io7 *io7;
int pid, port;
/* FIXME - encoding is going to have to change for Marvel
* since hose will be able to overflow a byte...
* need to fix this decode when the console
* changes its encoding
*/
printk("console graphics is on hose %d (console)\n", h);
/*
* The console's hose numbering is:
*
* hose<n:2>: PID
* hose<1:0>: PORT
*
* We need to find the hose at that pid and port
*/
pid = h >> 2;
port = h & 3;
if ((io7 = marvel_find_io7(pid)))
hose = io7->ports[port].hose;
if (hose) {
printk("Console graphics on hose %d\n", hose->index);
pci_vga_hose = hose;
}
}
}
gct6_search_struct gct_wanted_node_list[] = {
{ GCT_TYPE_HOSE, GCT_SUBTYPE_IO_PORT_MODULE, marvel_io7_present },
{ 0, 0, NULL }
};
/*
* In case the GCT is not complete, let the user specify PIDs with IO7s
* at boot time. Syntax is 'io7=a,b,c,...,n' where a-n are the PIDs (decimal)
* where IO7s are connected
*/
static int __init
marvel_specify_io7(char *str)
{
unsigned long pid;
struct io7 *io7;
char *pchar;
do {
pid = simple_strtoul(str, &pchar, 0);
if (pchar != str) {
printk("User-specified IO7 at PID %lu\n", pid);
io7 = alloc_io7(pid);
if (io7) marvel_init_io7(io7);
}
if (pchar == str) pchar++;
str = pchar;
} while(*str);
return 1;
}
__setup("io7=", marvel_specify_io7);
void __init
marvel_init_arch(void)
{
struct io7 *io7;
/* With multiple PCI busses, we play with I/O as physical addrs. */
ioport_resource.end = ~0UL;
/* PCI DMA Direct Mapping is 1GB at 2GB. */
__direct_map_base = 0x80000000;
__direct_map_size = 0x40000000;
/* Parse the config tree. */
gct6_find_nodes(GCT_NODE_PTR(0), gct_wanted_node_list);
/* Init the io7s. */
for (io7 = NULL; NULL != (io7 = marvel_next_io7(io7)); )
marvel_init_io7(io7);
/* Check for graphic console location (if any). */
marvel_find_console_vga_hose();
}
void
marvel_kill_arch(int mode)
{
}
/*
* PCI Configuration Space access functions
*
* Configuration space addresses have the following format:
*
* |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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |B|B|B|B|B|B|B|B|D|D|D|D|D|F|F|F|R|R|R|R|R|R|R|R|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* n:24 reserved for hose base
* 23:16 bus number (8 bits = 128 possible buses)
* 15:11 Device number (5 bits)
* 10:8 function number
* 7:2 register number
*
* Notes:
* IO7 determines whether to use a type 0 or type 1 config cycle
* based on the bus number. Therefore the bus number must be set
* to 0 for the root bus on any hose.
*
* The function number selects which function of a multi-function device
* (e.g., SCSI and Ethernet).
*
*/
static inline unsigned long
build_conf_addr(struct pci_controller *hose, u8 bus,
unsigned int devfn, int where)
{
return (hose->config_space_base | (bus << 16) | (devfn << 8) | where);
}
static unsigned long
mk_conf_addr(struct pci_bus *pbus, unsigned int devfn, int where)
{
struct pci_controller *hose = pbus->sysdata;
struct io7_port *io7_port;
unsigned long addr = 0;
u8 bus = pbus->number;
if (!hose)
return addr;
/* Check for enabled. */
io7_port = hose->sysdata;
if (!io7_port->enabled)
return addr;
if (!pbus->parent) { /* No parent means peer PCI bus. */
/* Don't support idsel > 20 on primary bus. */
if (devfn >= PCI_DEVFN(21, 0))
return addr;
bus = 0;
}
addr = build_conf_addr(hose, bus, devfn, where);
DBG_CFG(("mk_conf_addr: returning pci_addr 0x%lx\n", addr));
return addr;
}
static int
marvel_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *value)
{
unsigned long addr;
if (0 == (addr = mk_conf_addr(bus, devfn, where)))
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;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
return PCIBIOS_SUCCESSFUL;
}
static int
marvel_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 value)
{
unsigned long addr;
if (0 == (addr = mk_conf_addr(bus, devfn, where)))
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;
default:
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops marvel_pci_ops =
{
.read = marvel_read_config,
.write = marvel_write_config,
};
/*
* Other PCI helper functions.
*/
void
marvel_pci_tbi(struct pci_controller *hose, dma_addr_t start, dma_addr_t end)
{
io7_ioport_csrs *csrs = ((struct io7_port *)hose->sysdata)->csrs;
wmb();
csrs->POx_SG_TBIA.csr = 0;
mb();
csrs->POx_SG_TBIA.csr;
}
/*
* RTC Support
*/
struct marvel_rtc_access_info {
unsigned long function;
unsigned long index;
unsigned long data;
};
static void
__marvel_access_rtc(void *info)
{
struct marvel_rtc_access_info *rtc_access = info;
register unsigned long __r0 __asm__("$0");
register unsigned long __r16 __asm__("$16") = rtc_access->function;
register unsigned long __r17 __asm__("$17") = rtc_access->index;
register unsigned long __r18 __asm__("$18") = rtc_access->data;
__asm__ __volatile__(
"call_pal %4 # cserve rtc"
: "=r"(__r16), "=r"(__r17), "=r"(__r18), "=r"(__r0)
: "i"(PAL_cserve), "0"(__r16), "1"(__r17), "2"(__r18)
: "$1", "$22", "$23", "$24", "$25");
rtc_access->data = __r0;
}
static u8
__marvel_rtc_io(u8 b, unsigned long addr, int write)
{
static u8 index = 0;
struct marvel_rtc_access_info rtc_access;
u8 ret = 0;
switch(addr) {
case 0x70: /* RTC_PORT(0) */
if (write) index = b;
ret = index;
break;
case 0x71: /* RTC_PORT(1) */
rtc_access.index = index;
rtc_access.data = bcd2bin(b);
rtc_access.function = 0x48 + !write; /* GET/PUT_TOY */
__marvel_access_rtc(&rtc_access);
ret = bin2bcd(rtc_access.data);
break;
default:
printk(KERN_WARNING "Illegal RTC port %lx\n", addr);
break;
}
return ret;
}
/*
* IO map support.
*/
void __iomem *
marvel_ioremap(unsigned long addr, unsigned long size)
{
struct pci_controller *hose;
unsigned long baddr, last;
struct vm_struct *area;
unsigned long vaddr;
unsigned long *ptes;
unsigned long pfn;
/*
* Adjust the address.
*/
FIXUP_MEMADDR_VGA(addr);
/*
* Find the hose.
*/
for (hose = hose_head; hose; hose = hose->next) {
if ((addr >> 32) == (hose->mem_space->start >> 32))
break;
}
if (!hose)
return NULL;
/*
* We have the hose - calculate the bus limits.
*/
baddr = addr - hose->mem_space->start;
last = baddr + size - 1;
/*
* Is it direct-mapped?
*/
if ((baddr >= __direct_map_base) &&
((baddr + size - 1) < __direct_map_base + __direct_map_size)) {
addr = IDENT_ADDR | (baddr - __direct_map_base);
return (void __iomem *) addr;
}
/*
* 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)
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 map...\n");
vfree(area->addr);
return NULL;
}
}
flush_tlb_all();
vaddr = (unsigned long)area->addr + (addr & ~PAGE_MASK);
return (void __iomem *) vaddr;
}
/* Assume it was already a reasonable address */
vaddr = baddr + hose->mem_space->start;
return (void __iomem *) vaddr;
}
void
marvel_iounmap(volatile void __iomem *xaddr)
{
unsigned long addr = (unsigned long) xaddr;
if (addr >= VMALLOC_START)
vfree((void *)(PAGE_MASK & addr));
}
int
marvel_is_mmio(const volatile void __iomem *xaddr)
{
unsigned long addr = (unsigned long) xaddr;
if (addr >= VMALLOC_START)
return 1;
else
return (addr & 0xFF000000UL) == 0;
}
#define __marvel_is_port_kbd(a) (((a) == 0x60) || ((a) == 0x64))
#define __marvel_is_port_rtc(a) (((a) == 0x70) || ((a) == 0x71))
void __iomem *marvel_ioportmap (unsigned long addr)
{
FIXUP_IOADDR_VGA(addr);
return (void __iomem *)addr;
}
unsigned int
marvel_ioread8(void __iomem *xaddr)
{
unsigned long addr = (unsigned long) xaddr;
if (__marvel_is_port_kbd(addr))
return 0;
else if (__marvel_is_port_rtc(addr))
return __marvel_rtc_io(0, addr, 0);
else if (marvel_is_ioaddr(addr))
return __kernel_ldbu(*(vucp)addr);
else
/* this should catch other legacy addresses
that would normally fail on MARVEL,
because there really is nothing there...
*/
return ~0;
}
void
marvel_iowrite8(u8 b, void __iomem *xaddr)
{
unsigned long addr = (unsigned long) xaddr;
if (__marvel_is_port_kbd(addr))
return;
else if (__marvel_is_port_rtc(addr))
__marvel_rtc_io(b, addr, 1);
else if (marvel_is_ioaddr(addr))
__kernel_stb(b, *(vucp)addr);
}
#ifndef CONFIG_ALPHA_GENERIC
EXPORT_SYMBOL(marvel_ioremap);
EXPORT_SYMBOL(marvel_iounmap);
EXPORT_SYMBOL(marvel_is_mmio);
EXPORT_SYMBOL(marvel_ioportmap);
EXPORT_SYMBOL(marvel_ioread8);
EXPORT_SYMBOL(marvel_iowrite8);
#endif
/*
* NUMA Support
*/
/**********
* FIXME - for now each cpu is a node by itself
* -- no real support for striped mode
**********
*/
int
marvel_pa_to_nid(unsigned long pa)
{
int cpuid;
if ((pa >> 43) & 1) /* I/O */
cpuid = (~(pa >> 35) & 0xff);
else /* mem */
cpuid = ((pa >> 34) & 0x3) | ((pa >> (37 - 2)) & (0x1f << 2));
return marvel_cpuid_to_nid(cpuid);
}
int
marvel_cpuid_to_nid(int cpuid)
{
return cpuid;
}
unsigned long
marvel_node_mem_start(int nid)
{
unsigned long pa;
pa = (nid & 0x3) | ((nid & (0x1f << 2)) << 1);
pa <<= 34;
return pa;
}
unsigned long
marvel_node_mem_size(int nid)
{
return 16UL * 1024 * 1024 * 1024; /* 16GB */
}
/*
* AGP GART Support.
*/
#include <linux/agp_backend.h>
#include <asm/agp_backend.h>
#include <linux/slab.h>
#include <linux/delay.h>
struct marvel_agp_aperture {
struct pci_iommu_arena *arena;
long pg_start;
long pg_count;
};
static int
marvel_agp_setup(alpha_agp_info *agp)
{
struct marvel_agp_aperture *aper;
if (!alpha_agpgart_size)
return -ENOMEM;
aper = kmalloc(sizeof(*aper), 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
marvel_agp_cleanup(alpha_agp_info *agp)
{
struct marvel_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
marvel_agp_configure(alpha_agp_info *agp)
{
io7_ioport_csrs *csrs = ((struct io7_port *)agp->hose->sysdata)->csrs;
struct io7 *io7 = ((struct io7_port *)agp->hose->sysdata)->io7;
unsigned int new_rate = 0;
unsigned long agp_pll;
/*
* Check the requested mode against the PLL setting.
* The agpgart_be code has not programmed the card yet,
* so we can still tweak mode here.
*/
agp_pll = io7->csrs->POx_RST[IO7_AGP_PORT].csr;
switch(IO7_PLL_RNGB(agp_pll)) {
case 0x4: /* 2x only */
/*
* The PLL is only programmed for 2x, so adjust the
* rate to 2x, if necessary.
*/
if (agp->mode.bits.rate != 2)
new_rate = 2;
break;
case 0x6: /* 1x / 4x */
/*
* The PLL is programmed for 1x or 4x. Don't go faster
* than requested, so if the requested rate is 2x, use 1x.
*/
if (agp->mode.bits.rate == 2)
new_rate = 1;
break;
default: /* ??????? */
/*
* Don't know what this PLL setting is, take the requested
* rate, but warn the user.
*/
printk("%s: unknown PLL setting RNGB=%lx (PLL6_CTL=%016lx)\n",
__func__, IO7_PLL_RNGB(agp_pll), agp_pll);
break;
}
/*
* Set the new rate, if necessary.
*/
if (new_rate) {
printk("Requested AGP Rate %dX not compatible "
"with PLL setting - using %dX\n",
agp->mode.bits.rate,
new_rate);
agp->mode.bits.rate = new_rate;
}
printk("Enabling AGP on hose %d: %dX%s RQ %d\n",
agp->hose->index, agp->mode.bits.rate,
agp->mode.bits.sba ? " - SBA" : "", agp->mode.bits.rq);
csrs->AGP_CMD.csr = agp->mode.lw;
return 0;
}
static int
marvel_agp_bind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem)
{
struct marvel_agp_aperture *aper = agp->aperture.sysdata;
return iommu_bind(aper->arena, aper->pg_start + pg_start,
mem->page_count, mem->pages);
}
static int
marvel_agp_unbind_memory(alpha_agp_info *agp, off_t pg_start, struct agp_memory *mem)
{
struct marvel_agp_aperture *aper = agp->aperture.sysdata;
return iommu_unbind(aper->arena, aper->pg_start + pg_start,
mem->page_count);
}
static unsigned long
marvel_agp_translate(alpha_agp_info *agp, dma_addr_t addr)
{
struct marvel_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 marvel_agp_ops =
{
.setup = marvel_agp_setup,
.cleanup = marvel_agp_cleanup,
.configure = marvel_agp_configure,
.bind = marvel_agp_bind_memory,
.unbind = marvel_agp_unbind_memory,
.translate = marvel_agp_translate
};
alpha_agp_info *
marvel_agp_info(void)
{
struct pci_controller *hose;
io7_ioport_csrs *csrs;
alpha_agp_info *agp;
struct io7 *io7;
/*
* Find the first IO7 with an AGP card.
*
* FIXME -- there should be a better way (we want to be able to
* specify and what if the agp card is not video???)
*/
hose = NULL;
for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; ) {
struct pci_controller *h;
vuip addr;
if (!io7->ports[IO7_AGP_PORT].enabled)
continue;
h = io7->ports[IO7_AGP_PORT].hose;
addr = (vuip)build_conf_addr(h, 0, PCI_DEVFN(5, 0), 0);
if (*addr != 0xffffffffu) {
hose = h;
break;
}
}
if (!hose || !hose->sg_pci)
return NULL;
printk("MARVEL - using hose %d as AGP\n", hose->index);
/*
* Get the csrs from the hose.
*/
csrs = ((struct io7_port *)hose->sysdata)->csrs;
/*
* Allocate the info structure.
*/
agp = kmalloc(sizeof(*agp), GFP_KERNEL);
if (!agp)
return NULL;
/*
* Fill it in.
*/
agp->hose = hose;
agp->private = NULL;
agp->ops = &marvel_agp_ops;
/*
* Aperture - not configured until ops.setup().
*/
agp->aperture.bus_base = 0;
agp->aperture.size = 0;
agp->aperture.sysdata = NULL;
/*
* Capabilities.
*
* NOTE: IO7 reports through AGP_STAT that it can support a read queue
* depth of 17 (rq = 0x10). It actually only supports a depth of
* 16 (rq = 0xf).
*/
agp->capability.lw = csrs->AGP_STAT.csr;
agp->capability.bits.rq = 0xf;
/*
* Mode.
*/
agp->mode.lw = csrs->AGP_CMD.csr;
return agp;
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...