Skip to content

Commit

Permalink
[POWERPC] Make U4 PCIe work on maple
Browse files Browse the repository at this point in the history 
The Maple support code was missing code for U4/CPC945 PCIe. This adds
it, enabling it to work on tigerwood boards, and possibly also js21
using SLOF. Also disable an obsolete firmware workaround.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
  • Loading branch information
Benjamin Herrenschmidt authored and Paul Mackerras committed Oct 10, 2006
1 parent 020533e commit c10af8c
Showing 1 changed file with 169 additions and 7 deletions.
176 changes: 169 additions & 7 deletions arch/powerpc/platforms/maple/pci.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -8,14 +8,15 @@
* 2 of the License, or (at your option) any later version.
*/

#define DEBUG
#undef DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>

#include <asm/sections.h>
#include <asm/io.h>
Expand All @@ -33,7 +34,7 @@
#define DBG(x...)
#endif

static struct pci_controller *u3_agp, *u3_ht;
static struct pci_controller *u3_agp, *u3_ht, *u4_pcie;

static int __init fixup_one_level_bus_range(struct device_node *node, int higher)
{
Expand Down Expand Up @@ -287,6 +288,114 @@ static struct pci_ops u3_ht_pci_ops =
u3_ht_write_config
};

static unsigned int u4_pcie_cfa0(unsigned int devfn, unsigned int off)
{
return (1 << PCI_SLOT(devfn)) |
(PCI_FUNC(devfn) << 8) |
((off >> 8) << 28) |
(off & 0xfcu);
}

static unsigned int u4_pcie_cfa1(unsigned int bus, unsigned int devfn,
unsigned int off)
{
return (bus << 16) |
(devfn << 8) |
((off >> 8) << 28) |
(off & 0xfcu) | 1u;
}

static volatile void __iomem *u4_pcie_cfg_access(struct pci_controller* hose,
u8 bus, u8 dev_fn, int offset)
{
unsigned int caddr;

if (bus == hose->first_busno)
caddr = u4_pcie_cfa0(dev_fn, offset);
else
caddr = u4_pcie_cfa1(bus, dev_fn, offset);

/* Uninorth will return garbage if we don't read back the value ! */
do {
out_le32(hose->cfg_addr, caddr);
} while (in_le32(hose->cfg_addr) != caddr);

offset &= 0x03;
return hose->cfg_data + offset;
}

static int u4_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
struct pci_controller *hose;
volatile void __iomem *addr;

hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (offset >= 0x1000)
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
*val = in_8(addr);
break;
case 2:
*val = in_le16(addr);
break;
default:
*val = in_le32(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int u4_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 val)
{
struct pci_controller *hose;
volatile void __iomem *addr;

hose = pci_bus_to_host(bus);
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (offset >= 0x1000)
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = u4_pcie_cfg_access(hose, bus->number, devfn, offset);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* Note: the caller has already checked that offset is
* suitably aligned and that len is 1, 2 or 4.
*/
switch (len) {
case 1:
out_8(addr, val);
(void) in_8(addr);
break;
case 2:
out_le16(addr, val);
(void) in_le16(addr);
break;
default:
out_le32(addr, val);
(void) in_le32(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops u4_pcie_pci_ops =
{
u4_pcie_read_config,
u4_pcie_write_config
};

static void __init setup_u3_agp(struct pci_controller* hose)
{
/* On G5, we move AGP up to high bus number so we don't need
Expand All @@ -307,6 +416,26 @@ static void __init setup_u3_agp(struct pci_controller* hose)
u3_agp = hose;
}

static void __init setup_u4_pcie(struct pci_controller* hose)
{
/* We currently only implement the "non-atomic" config space, to
* be optimised later.
*/
hose->ops = &u4_pcie_pci_ops;
hose->cfg_addr = ioremap(0xf0000000 + 0x800000, 0x1000);
hose->cfg_data = ioremap(0xf0000000 + 0xc00000, 0x1000);

/* The bus contains a bridge from root -> device, we need to
* make it visible on bus 0 so that we pick the right type
* of config cycles. If we didn't, we would have to force all
* config cycles to be type 1. So we override the "bus-range"
* property here
*/
hose->first_busno = 0x00;
hose->last_busno = 0xff;
u4_pcie = hose;
}

static void __init setup_u3_ht(struct pci_controller* hose)
{
hose->ops = &u3_ht_pci_ops;
Expand Down Expand Up @@ -354,14 +483,17 @@ static int __init add_bridge(struct device_node *dev)
setup_u3_ht(hose);
disp_name = "U3-HT";
primary = 1;
} else if (device_is_compatible(dev, "u4-pcie")) {
setup_u4_pcie(hose);
disp_name = "U4-PCIE";
primary = 0;
}
printk(KERN_INFO "Found %s PCI host bridge. Firmware bus number: %d->%d\n",
disp_name, hose->first_busno, hose->last_busno);

/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pci_process_bridge_OF_ranges(hose, dev, primary);
pci_setup_phb_io(hose, primary);

/* Fixup "bus-range" OF property */
fixup_bus_range(dev);
Expand All @@ -376,8 +508,17 @@ void __init maple_pcibios_fixup(void)

DBG(" -> maple_pcibios_fixup\n");

for_each_pci_dev(dev)
pci_read_irq_line(dev);
for_each_pci_dev(dev) {
/* Fixup IRQ for PCIe host */
if (u4_pcie != NULL && dev->bus->number == 0 &&
pci_bus_to_host(dev->bus) == u4_pcie) {
printk(KERN_DEBUG "Fixup U4 PCIe IRQ\n");
dev->irq = irq_create_mapping(NULL, 1);
if (dev->irq != NO_IRQ)
set_irq_type(dev->irq, IRQ_TYPE_LEVEL_LOW);
} else
pci_read_irq_line(dev);
}

DBG(" <- maple_pcibios_fixup\n");
}
Expand All @@ -388,8 +529,10 @@ static void __init maple_fixup_phb_resources(void)

list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
unsigned long offset = (unsigned long)hose->io_base_virt - pci_io_base;

hose->io_resource.start += offset;
hose->io_resource.end += offset;

printk(KERN_INFO "PCI Host %d, io start: %llx; io end: %llx\n",
hose->global_number,
(unsigned long long)hose->io_resource.start,
Expand Down Expand Up @@ -431,6 +574,19 @@ void __init maple_pci_init(void)
if (ht && add_bridge(ht) != 0)
of_node_put(ht);

/*
* We need to call pci_setup_phb_io for the HT bridge first
* so it gets the I/O port numbers starting at 0, and we
* need to call it for the AGP bridge after that so it gets
* small positive I/O port numbers.
*/
if (u3_ht)
pci_setup_phb_io(u3_ht, 1);
if (u3_agp)
pci_setup_phb_io(u3_agp, 0);
if (u4_pcie)
pci_setup_phb_io(u4_pcie, 0);

/* Fixup the IO resources on our host bridges as the common code
* does it only for childs of the host bridges
*/
Expand Down Expand Up @@ -465,8 +621,11 @@ int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
return defirq;

np = pci_device_to_OF_node(pdev);
if (np == NULL)
if (np == NULL) {
printk("Failed to locate OF node for IDE %s\n",
pci_name(pdev));
return defirq;
}
irq = irq_of_parse_and_map(np, channel & 0x1);
if (irq == NO_IRQ) {
printk("Failed to map onboard IDE interrupt for channel %d\n",
Expand All @@ -479,6 +638,9 @@ int maple_pci_get_legacy_ide_irq(struct pci_dev *pdev, int channel)
/* XXX: To remove once all firmwares are ok */
static void fixup_maple_ide(struct pci_dev* dev)
{
if (!machine_is(maple))
return;

#if 0 /* Enable this to enable IDE port 0 */
{
u8 v;
Expand All @@ -495,7 +657,7 @@ static void fixup_maple_ide(struct pci_dev* dev)
dev->resource[4].start = 0xcc00;
dev->resource[4].end = 0xcc10;
#endif
#if 1 /* Enable this to fixup IDE sense/polarity of irqs in IO-APICs */
#if 0 /* Enable this to fixup IDE sense/polarity of irqs in IO-APICs */
{
struct pci_dev *apicdev;
u32 v;
Expand Down

0 comments on commit c10af8c

Please sign in to comment.