[POWERPC] 4xx: PLB to PCI-X support

This adds base support code for the 4xx PCI-X bridge. It also provides
placeholders for the PCI and PCI-E version but they aren't supported
with this patch.

The bridges are configured based on device-tree properties.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Benjamin Herrenschmidt 2007-12-21 15:39:22 +11:00 committed by Josh Boyer
parent 0e6140a56f
commit 5738ec6d00
3 changed files with 448 additions and 0 deletions

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@ -27,6 +27,9 @@ obj-$(CONFIG_PPC_I8259) += i8259.o
obj-$(CONFIG_PPC_83xx) += ipic.o
obj-$(CONFIG_4xx) += uic.o
obj-$(CONFIG_XILINX_VIRTEX) += xilinx_intc.o
ifeq ($(CONFIG_PCI),y)
obj-$(CONFIG_4xx) += ppc4xx_pci.o
endif
endif
# Temporary hack until we have migrated to asm-powerpc

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@ -0,0 +1,339 @@
/*
* PCI / PCI-X / PCI-Express support for 4xx parts
*
* Copyright 2007 Ben. Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
*
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/of.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include "ppc4xx_pci.h"
static int dma_offset_set;
/* Move that to a useable header */
extern unsigned long total_memory;
static int __init ppc4xx_parse_dma_ranges(struct pci_controller *hose,
void __iomem *reg,
struct resource *res)
{
u64 size;
const u32 *ranges;
int rlen;
int pna = of_n_addr_cells(hose->dn);
int np = pna + 5;
/* Default */
res->start = 0;
res->end = size = 0x80000000;
res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
/* Get dma-ranges property */
ranges = of_get_property(hose->dn, "dma-ranges", &rlen);
if (ranges == NULL)
goto out;
/* Walk it */
while ((rlen -= np * 4) >= 0) {
u32 pci_space = ranges[0];
u64 pci_addr = of_read_number(ranges + 1, 2);
u64 cpu_addr = of_translate_dma_address(hose->dn, ranges + 3);
size = of_read_number(ranges + pna + 3, 2);
ranges += np;
if (cpu_addr == OF_BAD_ADDR || size == 0)
continue;
/* We only care about memory */
if ((pci_space & 0x03000000) != 0x02000000)
continue;
/* We currently only support memory at 0, and pci_addr
* within 32 bits space
*/
if (cpu_addr != 0 || pci_addr > 0xffffffff) {
printk(KERN_WARNING "%s: Ignored unsupported dma range"
" 0x%016llx...0x%016llx -> 0x%016llx\n",
hose->dn->full_name,
pci_addr, pci_addr + size - 1, cpu_addr);
continue;
}
/* Check if not prefetchable */
if (!(pci_space & 0x40000000))
res->flags &= ~IORESOURCE_PREFETCH;
/* Use that */
res->start = pci_addr;
#ifndef CONFIG_RESOURCES_64BIT
/* Beware of 32 bits resources */
if ((pci_addr + size) > 0x100000000ull)
res->end = 0xffffffff;
else
#endif
res->end = res->start + size - 1;
break;
}
/* We only support one global DMA offset */
if (dma_offset_set && pci_dram_offset != res->start) {
printk(KERN_ERR "%s: dma-ranges(s) mismatch\n",
hose->dn->full_name);
return -ENXIO;
}
/* Check that we can fit all of memory as we don't support
* DMA bounce buffers
*/
if (size < total_memory) {
printk(KERN_ERR "%s: dma-ranges too small "
"(size=%llx total_memory=%lx)\n",
hose->dn->full_name, size, total_memory);
return -ENXIO;
}
/* Check we are a power of 2 size and that base is a multiple of size*/
if (!is_power_of_2(size) ||
(res->start & (size - 1)) != 0) {
printk(KERN_ERR "%s: dma-ranges unaligned\n",
hose->dn->full_name);
return -ENXIO;
}
/* Check that we are fully contained within 32 bits space */
if (res->end > 0xffffffff) {
printk(KERN_ERR "%s: dma-ranges outside of 32 bits space\n",
hose->dn->full_name);
return -ENXIO;
}
out:
dma_offset_set = 1;
pci_dram_offset = res->start;
printk(KERN_INFO "4xx PCI DMA offset set to 0x%08lx\n",
pci_dram_offset);
return 0;
}
/*
* 4xx PCI 2.x part
*/
static void __init ppc4xx_probe_pci_bridge(struct device_node *np)
{
/* NYI */
}
/*
* 4xx PCI-X part
*/
static void __init ppc4xx_configure_pcix_POMs(struct pci_controller *hose,
void __iomem *reg)
{
u32 lah, lal, pciah, pcial, sa;
int i, j;
/* Setup outbound memory windows */
for (i = j = 0; i < 3; i++) {
struct resource *res = &hose->mem_resources[i];
/* we only care about memory windows */
if (!(res->flags & IORESOURCE_MEM))
continue;
if (j > 1) {
printk(KERN_WARNING "%s: Too many ranges\n",
hose->dn->full_name);
break;
}
/* Calculate register values */
#ifdef CONFIG_PTE_64BIT
lah = res->start >> 32;
lal = res->start & 0xffffffffu;
pciah = (res->start - hose->pci_mem_offset) >> 32;
pcial = (res->start - hose->pci_mem_offset) & 0xffffffffu;
#else
lah = pciah = 0;
lal = res->start;
pcial = res->start - hose->pci_mem_offset;
#endif
sa = res->end + 1 - res->start;
if (!is_power_of_2(sa) || sa < 0x100000 ||
sa > 0xffffffffu) {
printk(KERN_WARNING "%s: Resource out of range\n",
hose->dn->full_name);
continue;
}
sa = (0xffffffffu << ilog2(sa)) | 0x1;
/* Program register values */
if (j == 0) {
writel(lah, reg + PCIX0_POM0LAH);
writel(lal, reg + PCIX0_POM0LAL);
writel(pciah, reg + PCIX0_POM0PCIAH);
writel(pcial, reg + PCIX0_POM0PCIAL);
writel(sa, reg + PCIX0_POM0SA);
} else {
writel(lah, reg + PCIX0_POM1LAH);
writel(lal, reg + PCIX0_POM1LAL);
writel(pciah, reg + PCIX0_POM1PCIAH);
writel(pcial, reg + PCIX0_POM1PCIAL);
writel(sa, reg + PCIX0_POM1SA);
}
j++;
}
}
static void __init ppc4xx_configure_pcix_PIMs(struct pci_controller *hose,
void __iomem *reg,
const struct resource *res,
int big_pim,
int enable_msi_hole)
{
resource_size_t size = res->end - res->start + 1;
u32 sa;
/* RAM is always at 0 */
writel(0x00000000, reg + PCIX0_PIM0LAH);
writel(0x00000000, reg + PCIX0_PIM0LAL);
/* Calculate window size */
sa = (0xffffffffu << ilog2(size)) | 1;
sa |= 0x1;
if (res->flags & IORESOURCE_PREFETCH)
sa |= 0x2;
if (enable_msi_hole)
sa |= 0x4;
writel(sa, reg + PCIX0_PIM0SA);
if (big_pim)
writel(0xffffffff, reg + PCIX0_PIM0SAH);
/* Map on PCI side */
writel(0x00000000, reg + PCIX0_BAR0H);
writel(res->start, reg + PCIX0_BAR0L);
writew(0x0006, reg + PCIX0_COMMAND);
}
static void __init ppc4xx_probe_pcix_bridge(struct device_node *np)
{
struct resource rsrc_cfg;
struct resource rsrc_reg;
struct resource dma_window;
struct pci_controller *hose = NULL;
void __iomem *reg = NULL;
const int *bus_range;
int big_pim = 0, msi = 0, primary = 0;
/* Fetch config space registers address */
if (of_address_to_resource(np, 0, &rsrc_cfg)) {
printk(KERN_ERR "%s:Can't get PCI-X config register base !",
np->full_name);
return;
}
/* Fetch host bridge internal registers address */
if (of_address_to_resource(np, 3, &rsrc_reg)) {
printk(KERN_ERR "%s: Can't get PCI-X internal register base !",
np->full_name);
return;
}
/* Check if it supports large PIMs (440GX) */
if (of_get_property(np, "large-inbound-windows", NULL))
big_pim = 1;
/* Check if we should enable MSIs inbound hole */
if (of_get_property(np, "enable-msi-hole", NULL))
msi = 1;
/* Check if primary bridge */
if (of_get_property(np, "primary", NULL))
primary = 1;
/* Get bus range if any */
bus_range = of_get_property(np, "bus-range", NULL);
/* Map registers */
reg = ioremap(rsrc_reg.start, rsrc_reg.end + 1 - rsrc_reg.start);
if (reg == NULL) {
printk(KERN_ERR "%s: Can't map registers !", np->full_name);
goto fail;
}
/* Allocate the host controller data structure */
hose = pcibios_alloc_controller(np);
if (!hose)
goto fail;
hose->first_busno = bus_range ? bus_range[0] : 0x0;
hose->last_busno = bus_range ? bus_range[1] : 0xff;
/* Setup config space */
setup_indirect_pci(hose, rsrc_cfg.start, rsrc_cfg.start + 0x4, 0);
/* Disable all windows */
writel(0, reg + PCIX0_POM0SA);
writel(0, reg + PCIX0_POM1SA);
writel(0, reg + PCIX0_POM2SA);
writel(0, reg + PCIX0_PIM0SA);
writel(0, reg + PCIX0_PIM1SA);
writel(0, reg + PCIX0_PIM2SA);
if (big_pim) {
writel(0, reg + PCIX0_PIM0SAH);
writel(0, reg + PCIX0_PIM2SAH);
}
/* Parse outbound mapping resources */
pci_process_bridge_OF_ranges(hose, np, primary);
/* Parse inbound mapping resources */
if (ppc4xx_parse_dma_ranges(hose, reg, &dma_window) != 0)
goto fail;
/* Configure outbound ranges POMs */
ppc4xx_configure_pcix_POMs(hose, reg);
/* Configure inbound ranges PIMs */
ppc4xx_configure_pcix_PIMs(hose, reg, &dma_window, big_pim, msi);
/* We don't need the registers anymore */
iounmap(reg);
return;
fail:
if (hose)
pcibios_free_controller(hose);
if (reg)
iounmap(reg);
}
/*
* 4xx PCI-Express part
*/
static void __init ppc4xx_probe_pciex_bridge(struct device_node *np)
{
/* NYI */
}
static int __init ppc4xx_pci_find_bridges(void)
{
struct device_node *np;
for_each_compatible_node(np, NULL, "ibm,plb-pciex")
ppc4xx_probe_pciex_bridge(np);
for_each_compatible_node(np, NULL, "ibm,plb-pcix")
ppc4xx_probe_pcix_bridge(np);
for_each_compatible_node(np, NULL, "ibm,plb-pci")
ppc4xx_probe_pci_bridge(np);
return 0;
}
arch_initcall(ppc4xx_pci_find_bridges);

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@ -0,0 +1,106 @@
/*
* PCI / PCI-X / PCI-Express support for 4xx parts
*
* Copyright 2007 Ben. Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
*
* Bits and pieces extracted from arch/ppc support by
*
* Matt Porter <mporter@kernel.crashing.org>
*
* Copyright 2002-2005 MontaVista Software Inc.
*/
#ifndef __PPC4XX_PCI_H__
#define __PPC4XX_PCI_H__
/*
* 4xx PCI-X bridge register definitions
*/
#define PCIX0_VENDID 0x000
#define PCIX0_DEVID 0x002
#define PCIX0_COMMAND 0x004
#define PCIX0_STATUS 0x006
#define PCIX0_REVID 0x008
#define PCIX0_CLS 0x009
#define PCIX0_CACHELS 0x00c
#define PCIX0_LATTIM 0x00d
#define PCIX0_HDTYPE 0x00e
#define PCIX0_BIST 0x00f
#define PCIX0_BAR0L 0x010
#define PCIX0_BAR0H 0x014
#define PCIX0_BAR1 0x018
#define PCIX0_BAR2L 0x01c
#define PCIX0_BAR2H 0x020
#define PCIX0_BAR3 0x024
#define PCIX0_CISPTR 0x028
#define PCIX0_SBSYSVID 0x02c
#define PCIX0_SBSYSID 0x02e
#define PCIX0_EROMBA 0x030
#define PCIX0_CAP 0x034
#define PCIX0_RES0 0x035
#define PCIX0_RES1 0x036
#define PCIX0_RES2 0x038
#define PCIX0_INTLN 0x03c
#define PCIX0_INTPN 0x03d
#define PCIX0_MINGNT 0x03e
#define PCIX0_MAXLTNCY 0x03f
#define PCIX0_BRDGOPT1 0x040
#define PCIX0_BRDGOPT2 0x044
#define PCIX0_ERREN 0x050
#define PCIX0_ERRSTS 0x054
#define PCIX0_PLBBESR 0x058
#define PCIX0_PLBBEARL 0x05c
#define PCIX0_PLBBEARH 0x060
#define PCIX0_POM0LAL 0x068
#define PCIX0_POM0LAH 0x06c
#define PCIX0_POM0SA 0x070
#define PCIX0_POM0PCIAL 0x074
#define PCIX0_POM0PCIAH 0x078
#define PCIX0_POM1LAL 0x07c
#define PCIX0_POM1LAH 0x080
#define PCIX0_POM1SA 0x084
#define PCIX0_POM1PCIAL 0x088
#define PCIX0_POM1PCIAH 0x08c
#define PCIX0_POM2SA 0x090
#define PCIX0_PIM0SAL 0x098
#define PCIX0_PIM0SA PCIX0_PIM0SAL
#define PCIX0_PIM0LAL 0x09c
#define PCIX0_PIM0LAH 0x0a0
#define PCIX0_PIM1SA 0x0a4
#define PCIX0_PIM1LAL 0x0a8
#define PCIX0_PIM1LAH 0x0ac
#define PCIX0_PIM2SAL 0x0b0
#define PCIX0_PIM2SA PCIX0_PIM2SAL
#define PCIX0_PIM2LAL 0x0b4
#define PCIX0_PIM2LAH 0x0b8
#define PCIX0_OMCAPID 0x0c0
#define PCIX0_OMNIPTR 0x0c1
#define PCIX0_OMMC 0x0c2
#define PCIX0_OMMA 0x0c4
#define PCIX0_OMMUA 0x0c8
#define PCIX0_OMMDATA 0x0cc
#define PCIX0_OMMEOI 0x0ce
#define PCIX0_PMCAPID 0x0d0
#define PCIX0_PMNIPTR 0x0d1
#define PCIX0_PMC 0x0d2
#define PCIX0_PMCSR 0x0d4
#define PCIX0_PMCSRBSE 0x0d6
#define PCIX0_PMDATA 0x0d7
#define PCIX0_PMSCRR 0x0d8
#define PCIX0_CAPID 0x0dc
#define PCIX0_NIPTR 0x0dd
#define PCIX0_CMD 0x0de
#define PCIX0_STS 0x0e0
#define PCIX0_IDR 0x0e4
#define PCIX0_CID 0x0e8
#define PCIX0_RID 0x0ec
#define PCIX0_PIM0SAH 0x0f8
#define PCIX0_PIM2SAH 0x0fc
#define PCIX0_MSGIL 0x100
#define PCIX0_MSGIH 0x104
#define PCIX0_MSGOL 0x108
#define PCIX0_MSGOH 0x10c
#define PCIX0_IM 0x1f8
#endif /* __PPC4XX_PCI_H__ */