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linux/arch/arm/mach-integrator/pci_v3.c
Linus Walleij b71d8429ec mach-integrator: fix VGA base regression 
The changes introduced in commit
cc22b4c185
"ARM: set vga memory base at run-time"

Makes the Integrator/AP freeze completely. I appears that
this is due to the VGA base address being assigned at PCI
init time, while this base is needed earlier than that.
Moving the initialization of the base address to the
.map_io function solves this problem.

Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2011-09-20 22:58:41 +02:00

613 lines
17 KiB
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/*
* linux/arch/arm/mach-integrator/pci_v3.c
*
* PCI functions for V3 host PCI bridge
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000-2001 Deep Blue Solutions Ltd
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/platform.h>
#include <asm/irq.h>
#include <asm/signal.h>
#include <asm/system.h>
#include <asm/mach/pci.h>
#include <asm/irq_regs.h>
#include <asm/hardware/pci_v3.h>
/*
* The V3 PCI interface chip in Integrator provides several windows from
* local bus memory into the PCI memory areas. Unfortunately, there
* are not really enough windows for our usage, therefore we reuse
* one of the windows for access to PCI configuration space. The
* memory map is as follows:
*
* Local Bus Memory Usage
*
* 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable
* 50000000 - 5FFFFFFF PCI memory. 256M prefetchable
* 60000000 - 60FFFFFF PCI IO. 16M
* 61000000 - 61FFFFFF PCI Configuration. 16M
*
* There are three V3 windows, each described by a pair of V3 registers.
* These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2.
* Base0 and Base1 can be used for any type of PCI memory access. Base2
* can be used either for PCI I/O or for I20 accesses. By default, uHAL
* uses this only for PCI IO space.
*
* Normally these spaces are mapped using the following base registers:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF
*
* This means that I20 and PCI configuration space accesses will fail.
* When PCI configuration accesses are needed (via the uHAL PCI
* configuration space primitives) we must remap the spaces as follows:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0
* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0
* IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2
* Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1
*
* To make this work, the code depends on overlapping windows working.
* The V3 chip translates an address by checking its range within
* each of the BASE/MAP pairs in turn (in ascending register number
* order). It will use the first matching pair. So, for example,
* if the same address is mapped by both LB_BASE0/LB_MAP0 and
* LB_BASE1/LB_MAP1, the V3 will use the translation from
* LB_BASE0/LB_MAP0.
*
* To allow PCI Configuration space access, the code enlarges the
* window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes
* the windows currently mapped by LB_BASE1/LB_MAP1 so that it can
* be remapped for use by configuration cycles.
*
* At the end of the PCI Configuration space accesses,
* LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window
* mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to
* reveal the now restored LB_BASE1/LB_MAP1 window.
*
* NOTE: We do not set up I2O mapping. I suspect that this is only
* for an intelligent (target) device. Using I2O disables most of
* the mappings into PCI memory.
*/
// V3 access routines
#define v3_writeb(o,v) __raw_writeb(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readb(o) (__raw_readb(PCI_V3_VADDR + (unsigned int)(o)))
#define v3_writew(o,v) __raw_writew(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readw(o) (__raw_readw(PCI_V3_VADDR + (unsigned int)(o)))
#define v3_writel(o,v) __raw_writel(v, PCI_V3_VADDR + (unsigned int)(o))
#define v3_readl(o) (__raw_readl(PCI_V3_VADDR + (unsigned int)(o)))
/*============================================================================
*
* routine: uHALir_PCIMakeConfigAddress()
*
* parameters: bus = which bus
* device = which device
* function = which function
* offset = configuration space register we are interested in
*
* description: this routine will generate a platform dependent config
* address.
*
* calls: none
*
* returns: configuration address to play on the PCI bus
*
* To generate the appropriate PCI configuration cycles in the PCI
* configuration address space, you present the V3 with the following pattern
* (which is very nearly a type 1 (except that the lower two bits are 00 and
* not 01). In order for this mapping to work you need to set up one of
* the local to PCI aperatures to 16Mbytes in length translating to
* PCI configuration space starting at 0x0000.0000.
*
* PCI configuration cycles look like this:
*
* Type 0:
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | |D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|D|F|F|F|R|R|R|R|R|R|0|0|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* 31:11 Device select bit.
* 10:8 Function number
* 7:2 Register 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
*
*/
static DEFINE_SPINLOCK(v3_lock);
#define PCI_BUS_NONMEM_START 0x00000000
#define PCI_BUS_NONMEM_SIZE SZ_256M
#define PCI_BUS_PREMEM_START PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE
#define PCI_BUS_PREMEM_SIZE SZ_256M
#if PCI_BUS_NONMEM_START & 0x000fffff
#error PCI_BUS_NONMEM_START must be megabyte aligned
#endif
#if PCI_BUS_PREMEM_START & 0x000fffff
#error PCI_BUS_PREMEM_START must be megabyte aligned
#endif
#undef V3_LB_BASE_PREFETCH
#define V3_LB_BASE_PREFETCH 0
static unsigned long v3_open_config_window(struct pci_bus *bus,
unsigned int devfn, int offset)
{
unsigned int address, mapaddress, busnr;
busnr = bus->number;
/*
* Trap out illegal values
*/
if (offset > 255)
BUG();
if (busnr > 255)
BUG();
if (devfn > 255)
BUG();
if (busnr == 0) {
int slot = PCI_SLOT(devfn);
/*
* local bus segment so need a type 0 config cycle
*
* build the PCI configuration "address" with one-hot in
* A31-A11
*
* mapaddress:
* 3:1 = config cycle (101)
* 0 = PCI A1 & A0 are 0 (0)
*/
address = PCI_FUNC(devfn) << 8;
mapaddress = V3_LB_MAP_TYPE_CONFIG;
if (slot > 12)
/*
* high order bits are handled by the MAP register
*/
mapaddress |= 1 << (slot - 5);
else
/*
* low order bits handled directly in the address
*/
address |= 1 << (slot + 11);
} else {
/*
* not the local bus segment so need a type 1 config cycle
*
* address:
* 23:16 = bus number
* 15:11 = slot number (7:3 of devfn)
* 10:8 = func number (2:0 of devfn)
*
* mapaddress:
* 3:1 = config cycle (101)
* 0 = PCI A1 & A0 from host bus (1)
*/
mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN;
address = (busnr << 16) | (devfn << 8);
}
/*
* Set up base0 to see all 512Mbytes of memory space (not
* prefetchable), this frees up base1 for re-use by
* configuration memory
*/
v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE);
/*
* Set up base1/map1 to point into configuration space.
*/
v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_CONFIG_BASE) |
V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE);
v3_writew(V3_LB_MAP1, mapaddress);
return PCI_CONFIG_VADDR + address + offset;
}
static void v3_close_config_window(void)
{
/*
* Reassign base1 for use by prefetchable PCI memory
*/
v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
V3_LB_BASE_ENABLE);
v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
V3_LB_MAP_TYPE_MEM_MULTIPLE);
/*
* And shrink base0 back to a 256M window (NOTE: MAP0 already correct)
*/
v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
}
static int v3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
unsigned long addr;
unsigned long flags;
u32 v;
spin_lock_irqsave(&v3_lock, flags);
addr = v3_open_config_window(bus, devfn, where);
switch (size) {
case 1:
v = __raw_readb(addr);
break;
case 2:
v = __raw_readw(addr);
break;
default:
v = __raw_readl(addr);
break;
}
v3_close_config_window();
spin_unlock_irqrestore(&v3_lock, flags);
*val = v;
return PCIBIOS_SUCCESSFUL;
}
static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
unsigned long addr;
unsigned long flags;
spin_lock_irqsave(&v3_lock, flags);
addr = v3_open_config_window(bus, devfn, where);
switch (size) {
case 1:
__raw_writeb((u8)val, addr);
__raw_readb(addr);
break;
case 2:
__raw_writew((u16)val, addr);
__raw_readw(addr);
break;
case 4:
__raw_writel(val, addr);
__raw_readl(addr);
break;
}
v3_close_config_window();
spin_unlock_irqrestore(&v3_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_v3_ops = {
.read = v3_read_config,
.write = v3_write_config,
};
static struct resource non_mem = {
.name = "PCI non-prefetchable",
.start = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START,
.end = PHYS_PCI_MEM_BASE + PCI_BUS_NONMEM_START + PCI_BUS_NONMEM_SIZE - 1,
.flags = IORESOURCE_MEM,
};
static struct resource pre_mem = {
.name = "PCI prefetchable",
.start = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START,
.end = PHYS_PCI_MEM_BASE + PCI_BUS_PREMEM_START + PCI_BUS_PREMEM_SIZE - 1,
.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
};
static int __init pci_v3_setup_resources(struct resource **resource)
{
if (request_resource(&iomem_resource, &non_mem)) {
printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
"memory region\n");
return -EBUSY;
}
if (request_resource(&iomem_resource, &pre_mem)) {
release_resource(&non_mem);
printk(KERN_ERR "PCI: unable to allocate prefetchable "
"memory region\n");
return -EBUSY;
}
/*
* bus->resource[0] is the IO resource for this bus
* bus->resource[1] is the mem resource for this bus
* bus->resource[2] is the prefetch mem resource for this bus
*/
resource[0] = &ioport_resource;
resource[1] = &non_mem;
resource[2] = &pre_mem;
return 1;
}
/*
* These don't seem to be implemented on the Integrator I have, which
* means I can't get additional information on the reason for the pm2fb
* problems. I suppose I'll just have to mind-meld with the machine. ;)
*/
#define SC_PCI IO_ADDRESS(INTEGRATOR_SC_PCIENABLE)
#define SC_LBFADDR IO_ADDRESS(INTEGRATOR_SC_BASE + 0x20)
#define SC_LBFCODE IO_ADDRESS(INTEGRATOR_SC_BASE + 0x24)
static int
v3_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
unsigned long instr = *(unsigned long *)pc;
#if 0
char buf[128];
sprintf(buf, "V3 fault: addr 0x%08lx, FSR 0x%03x, PC 0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x ISTAT=%02x\n",
addr, fsr, pc, instr, __raw_readl(SC_LBFADDR), __raw_readl(SC_LBFCODE) & 255,
v3_readb(V3_LB_ISTAT));
printk(KERN_DEBUG "%s", buf);
#endif
v3_writeb(V3_LB_ISTAT, 0);
__raw_writel(3, SC_PCI);
/*
* If the instruction being executed was a read,
* make it look like it read all-ones.
*/
if ((instr & 0x0c100000) == 0x04100000) {
int reg = (instr >> 12) & 15;
unsigned long val;
if (instr & 0x00400000)
val = 255;
else
val = -1;
regs->uregs[reg] = val;
regs->ARM_pc += 4;
return 0;
}
if ((instr & 0x0e100090) == 0x00100090) {
int reg = (instr >> 12) & 15;
regs->uregs[reg] = -1;
regs->ARM_pc += 4;
return 0;
}
return 1;
}
static irqreturn_t v3_irq(int dummy, void *devid)
{
#ifdef CONFIG_DEBUG_LL
struct pt_regs *regs = get_irq_regs();
unsigned long pc = instruction_pointer(regs);
unsigned long instr = *(unsigned long *)pc;
char buf[128];
extern void printascii(const char *);
sprintf(buf, "V3 int %d: pc=0x%08lx [%08lx] LBFADDR=%08x LBFCODE=%02x "
"ISTAT=%02x\n", IRQ_AP_V3INT, pc, instr,
__raw_readl(SC_LBFADDR),
__raw_readl(SC_LBFCODE) & 255,
v3_readb(V3_LB_ISTAT));
printascii(buf);
#endif
v3_writew(V3_PCI_STAT, 0xf000);
v3_writeb(V3_LB_ISTAT, 0);
__raw_writel(3, SC_PCI);
#ifdef CONFIG_DEBUG_LL
/*
* If the instruction being executed was a read,
* make it look like it read all-ones.
*/
if ((instr & 0x0c100000) == 0x04100000) {
int reg = (instr >> 16) & 15;
sprintf(buf, " reg%d = %08lx\n", reg, regs->uregs[reg]);
printascii(buf);
}
#endif
return IRQ_HANDLED;
}
int __init pci_v3_setup(int nr, struct pci_sys_data *sys)
{
int ret = 0;
if (nr == 0) {
sys->mem_offset = PHYS_PCI_MEM_BASE;
ret = pci_v3_setup_resources(sys->resource);
}
return ret;
}
struct pci_bus * __init pci_v3_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_bus(sys->busnr, &pci_v3_ops, sys);
}
/*
* V3_LB_BASE? - local bus address
* V3_LB_MAP? - pci bus address
*/
void __init pci_v3_preinit(void)
{
unsigned long flags;
unsigned int temp;
int ret;
pcibios_min_io = 0x6000;
pcibios_min_mem = 0x00100000;
/*
* Hook in our fault handler for PCI errors
*/
hook_fault_code(4, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
hook_fault_code(6, v3_pci_fault, SIGBUS, 0, "external abort on linefetch");
hook_fault_code(8, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
hook_fault_code(10, v3_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
spin_lock_irqsave(&v3_lock, flags);
/*
* Unlock V3 registers, but only if they were previously locked.
*/
if (v3_readw(V3_SYSTEM) & V3_SYSTEM_M_LOCK)
v3_writew(V3_SYSTEM, 0xa05f);
/*
* Setup window 0 - PCI non-prefetchable memory
* Local: 0x40000000 Bus: 0x00000000 Size: 256MB
*/
v3_writel(V3_LB_BASE0, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE);
v3_writew(V3_LB_MAP0, v3_addr_to_lb_map(PCI_BUS_NONMEM_START) |
V3_LB_MAP_TYPE_MEM);
/*
* Setup window 1 - PCI prefetchable memory
* Local: 0x50000000 Bus: 0x10000000 Size: 256MB
*/
v3_writel(V3_LB_BASE1, v3_addr_to_lb_base(PHYS_PCI_MEM_BASE + SZ_256M) |
V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH |
V3_LB_BASE_ENABLE);
v3_writew(V3_LB_MAP1, v3_addr_to_lb_map(PCI_BUS_PREMEM_START) |
V3_LB_MAP_TYPE_MEM_MULTIPLE);
/*
* Setup window 2 - PCI IO
*/
v3_writel(V3_LB_BASE2, v3_addr_to_lb_base2(PHYS_PCI_IO_BASE) |
V3_LB_BASE_ENABLE);
v3_writew(V3_LB_MAP2, v3_addr_to_lb_map2(0));
/*
* Disable PCI to host IO cycles
*/
temp = v3_readw(V3_PCI_CFG) & ~V3_PCI_CFG_M_I2O_EN;
temp |= V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS;
v3_writew(V3_PCI_CFG, temp);
printk(KERN_DEBUG "FIFO_CFG: %04x FIFO_PRIO: %04x\n",
v3_readw(V3_FIFO_CFG), v3_readw(V3_FIFO_PRIORITY));
/*
* Set the V3 FIFO such that writes have higher priority than
* reads, and local bus write causes local bus read fifo flush.
* Same for PCI.
*/
v3_writew(V3_FIFO_PRIORITY, 0x0a0a);
/*
* Re-lock the system register.
*/
temp = v3_readw(V3_SYSTEM) | V3_SYSTEM_M_LOCK;
v3_writew(V3_SYSTEM, temp);
/*
* Clear any error conditions, and enable write errors.
*/
v3_writeb(V3_LB_ISTAT, 0);
v3_writew(V3_LB_CFG, v3_readw(V3_LB_CFG) | (1 << 10));
v3_writeb(V3_LB_IMASK, 0x28);
__raw_writel(3, SC_PCI);
/*
* Grab the PCI error interrupt.
*/
ret = request_irq(IRQ_AP_V3INT, v3_irq, 0, "V3", NULL);
if (ret)
printk(KERN_ERR "PCI: unable to grab PCI error "
"interrupt: %d\n", ret);
spin_unlock_irqrestore(&v3_lock, flags);
}
void __init pci_v3_postinit(void)
{
unsigned int pci_cmd;
pci_cmd = PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
v3_writew(V3_PCI_CMD, pci_cmd);
v3_writeb(V3_LB_ISTAT, ~0x40);
v3_writeb(V3_LB_IMASK, 0x68);
#if 0
ret = request_irq(IRQ_AP_LBUSTIMEOUT, lb_timeout, 0, "bus timeout", NULL);
if (ret)
printk(KERN_ERR "PCI: unable to grab local bus timeout "
"interrupt: %d\n", ret);
#endif
register_isa_ports(PHYS_PCI_MEM_BASE, PHYS_PCI_IO_BASE, 0);
}
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