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-rw-r--r--arch/powerpc/sysdev/ppc4xx_pci.c220
-rw-r--r--arch/powerpc/sysdev/ppc4xx_pci.h2
2 files changed, 133 insertions, 89 deletions
diff --git a/arch/powerpc/sysdev/ppc4xx_pci.c b/arch/powerpc/sysdev/ppc4xx_pci.c
index b986eff09f6..0538980ef89 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.c
+++ b/arch/powerpc/sysdev/ppc4xx_pci.c
@@ -16,6 +16,8 @@
*
*/
+#undef DEBUG
+
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
@@ -531,10 +533,13 @@ struct ppc4xx_pciex_port
struct device_node *node;
unsigned int index;
int endpoint;
+ int link;
+ int has_ibpre;
unsigned int sdr_base;
dcr_host_t dcrs;
struct resource cfg_space;
struct resource utl_regs;
+ void __iomem *utl_base;
};
static struct ppc4xx_pciex_port *ppc4xx_pciex_ports;
@@ -706,29 +711,44 @@ static int ppc440spe_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
return 0;
}
-static int ppc440speA_pciex_init_utl(struct ppc4xx_pciex_port *port)
+static int ppc440speA_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
+{
+ return ppc440spe_pciex_init_port_hw(port);
+}
+
+static int ppc440speB_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
{
- void __iomem *utl_base;
+ int rc = ppc440spe_pciex_init_port_hw(port);
+
+ port->has_ibpre = 1;
+
+ return rc;
+}
+static int ppc440speA_pciex_init_utl(struct ppc4xx_pciex_port *port)
+{
/* XXX Check what that value means... I hate magic */
dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x68782800);
- utl_base = ioremap(port->utl_regs.start, 0x100);
- BUG_ON(utl_base == NULL);
-
/*
* Set buffer allocations and then assert VRB and TXE.
*/
- out_be32(utl_base + PEUTL_OUTTR, 0x08000000);
- out_be32(utl_base + PEUTL_INTR, 0x02000000);
- out_be32(utl_base + PEUTL_OPDBSZ, 0x10000000);
- out_be32(utl_base + PEUTL_PBBSZ, 0x53000000);
- out_be32(utl_base + PEUTL_IPHBSZ, 0x08000000);
- out_be32(utl_base + PEUTL_IPDBSZ, 0x10000000);
- out_be32(utl_base + PEUTL_RCIRQEN, 0x00f00000);
- out_be32(utl_base + PEUTL_PCTL, 0x80800066);
+ out_be32(port->utl_base + PEUTL_OUTTR, 0x08000000);
+ out_be32(port->utl_base + PEUTL_INTR, 0x02000000);
+ out_be32(port->utl_base + PEUTL_OPDBSZ, 0x10000000);
+ out_be32(port->utl_base + PEUTL_PBBSZ, 0x53000000);
+ out_be32(port->utl_base + PEUTL_IPHBSZ, 0x08000000);
+ out_be32(port->utl_base + PEUTL_IPDBSZ, 0x10000000);
+ out_be32(port->utl_base + PEUTL_RCIRQEN, 0x00f00000);
+ out_be32(port->utl_base + PEUTL_PCTL, 0x80800066);
- iounmap(utl_base);
+ return 0;
+}
+
+static int ppc440speB_pciex_init_utl(struct ppc4xx_pciex_port *port)
+{
+ /* Report CRS to the operating system */
+ out_be32(port->utl_base + PEUTL_PBCTL, 0x08000000);
return 0;
}
@@ -736,14 +756,15 @@ static int ppc440speA_pciex_init_utl(struct ppc4xx_pciex_port *port)
static struct ppc4xx_pciex_hwops ppc440speA_pcie_hwops __initdata =
{
.core_init = ppc440spe_pciex_core_init,
- .port_init_hw = ppc440spe_pciex_init_port_hw,
+ .port_init_hw = ppc440speA_pciex_init_port_hw,
.setup_utl = ppc440speA_pciex_init_utl,
};
static struct ppc4xx_pciex_hwops ppc440speB_pcie_hwops __initdata =
{
.core_init = ppc440spe_pciex_core_init,
- .port_init_hw = ppc440spe_pciex_init_port_hw,
+ .port_init_hw = ppc440speB_pciex_init_port_hw,
+ .setup_utl = ppc440speB_pciex_init_utl,
};
@@ -821,30 +842,21 @@ static int ppc405ex_pciex_init_port_hw(struct ppc4xx_pciex_port *port)
static int ppc405ex_pciex_init_utl(struct ppc4xx_pciex_port *port)
{
- void __iomem *utl_base;
-
dcr_write(port->dcrs, DCRO_PEGPL_SPECIAL, 0x0);
- utl_base = ioremap(port->utl_regs.start, 0x100);
- BUG_ON(utl_base == NULL);
-
/*
* Set buffer allocations and then assert VRB and TXE.
*/
- out_be32(utl_base + PEUTL_OUTTR, 0x02000000);
- out_be32(utl_base + PEUTL_INTR, 0x02000000);
- out_be32(utl_base + PEUTL_OPDBSZ, 0x04000000);
- out_be32(utl_base + PEUTL_PBBSZ, 0x21000000);
- out_be32(utl_base + PEUTL_IPHBSZ, 0x02000000);
- out_be32(utl_base + PEUTL_IPDBSZ, 0x04000000);
- out_be32(utl_base + PEUTL_RCIRQEN, 0x00f00000);
- out_be32(utl_base + PEUTL_PCTL, 0x80800066);
+ out_be32(port->utl_base + PEUTL_OUTTR, 0x02000000);
+ out_be32(port->utl_base + PEUTL_INTR, 0x02000000);
+ out_be32(port->utl_base + PEUTL_OPDBSZ, 0x04000000);
+ out_be32(port->utl_base + PEUTL_PBBSZ, 0x21000000);
+ out_be32(port->utl_base + PEUTL_IPHBSZ, 0x02000000);
+ out_be32(port->utl_base + PEUTL_IPDBSZ, 0x04000000);
+ out_be32(port->utl_base + PEUTL_RCIRQEN, 0x00f00000);
+ out_be32(port->utl_base + PEUTL_PCTL, 0x80800066);
- out_be32(utl_base + PEUTL_PBCTL, 0x0800000c);
- out_be32(utl_base + PEUTL_RCSTA,
- in_be32(utl_base + PEUTL_RCSTA) | 0x000040000);
-
- iounmap(utl_base);
+ out_be32(port->utl_base + PEUTL_PBCTL, 0x08000000);
return 0;
}
@@ -926,17 +938,29 @@ static void __init ppc4xx_pciex_port_init_mapping(struct ppc4xx_pciex_port *port
dcr_write(port->dcrs, DCRO_PEGPL_MSGMSK, 0);
}
-static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
+static int __init ppc4xx_pciex_wait_on_sdr(struct ppc4xx_pciex_port *port,
+ unsigned int sdr_offset,
+ unsigned int mask,
+ unsigned int value,
+ int timeout_ms)
{
- int attempts, rc = 0;
u32 val;
- /* Check if it's endpoint or root complex
- *
- * XXX Do we want to use the device-tree instead ? --BenH.
- */
- val = mfdcri(SDR0, port->sdr_base + PESDRn_DLPSET);
- port->endpoint = (((val >> 20) & 0xf) != PTYPE_ROOT_PORT);
+ while(timeout_ms--) {
+ val = mfdcri(SDR0, port->sdr_base + sdr_offset);
+ if ((val & mask) == value) {
+ pr_debug("PCIE%d: Wait on SDR %x success with tm %d (%08x)\n",
+ port->index, sdr_offset, timeout_ms, val);
+ return 0;
+ }
+ msleep(1);
+ }
+ return -1;
+}
+
+static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
+{
+ int rc = 0;
/* Init HW */
if (ppc4xx_pciex_hwops->port_init_hw)
@@ -944,44 +968,40 @@ static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
if (rc != 0)
return rc;
- /*
- * Notice: the following delay has critical impact on device
- * initialization - if too short (<50ms) the link doesn't get up.
- *
- * XXX FIXME: There are various issues with that link up thingy,
- * we could just wait for the link with a timeout but Stefan says
- * some cards need more time even after the link is up. I'll
- * investigate. For now, we keep a fixed 1s delay.
- *
- * Ultimately, it should be made asynchronous so all ports are
- * brought up simultaneously though.
- */
- printk(KERN_INFO "PCIE%d: Waiting for link to go up...\n",
+ printk(KERN_INFO "PCIE%d: Checking link...\n",
port->index);
- msleep(1000);
- /*
- * Check that we exited the reset state properly
- */
- val = mfdcri(SDR0, port->sdr_base + PESDRn_RCSSTS);
- if (val & (1 << 20)) {
- printk(KERN_WARNING "PCIE%d: PGRST failed %08x\n",
- port->index, val);
+ /* Wait for reset to complete */
+ if (ppc4xx_pciex_wait_on_sdr(port, PESDRn_RCSSTS, 1 << 20, 0, 10)) {
+ printk(KERN_WARNING "PCIE%d: PGRST failed\n",
+ port->index);
return -1;
}
- /*
- * Verify link is up
+ /* Check for card presence detect if supported, if not, just wait for
+ * link unconditionally.
+ *
+ * note that we don't fail if there is no link, we just filter out
+ * config space accesses. That way, it will be easier to implement
+ * hotplug later on.
*/
- val = mfdcri(SDR0, port->sdr_base + PESDRn_LOOP);
- if (!(val & 0x00001000)) {
- printk(KERN_INFO "PCIE%d: link is not up !\n",
+ if (!port->has_ibpre ||
+ !ppc4xx_pciex_wait_on_sdr(port, PESDRn_LOOP,
+ 1 << 28, 1 << 28, 100)) {
+ printk(KERN_INFO
+ "PCIE%d: Device detected, waiting for link...\n",
port->index);
- return -1;
- }
-
- printk(KERN_INFO "PCIE%d: link is up !\n",
- port->index);
+ if (ppc4xx_pciex_wait_on_sdr(port, PESDRn_LOOP,
+ 0x1000, 0x1000, 2000))
+ printk(KERN_WARNING
+ "PCIE%d: Link up failed\n", port->index);
+ else {
+ printk(KERN_INFO
+ "PCIE%d: link is up !\n", port->index);
+ port->link = 1;
+ }
+ } else
+ printk(KERN_INFO "PCIE%d: No device detected.\n", port->index);
/*
* Initialize mapping: disable all regions and configure
@@ -990,12 +1010,13 @@ static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
ppc4xx_pciex_port_init_mapping(port);
/*
- * Setup UTL registers - but only on revA!
- * We use default settings for revB chip.
- *
- * To be reworked. We may also be able to move that to
- * before the link wait
- * --BenH.
+ * Map UTL
+ */
+ port->utl_base = ioremap(port->utl_regs.start, 0x100);
+ BUG_ON(port->utl_base == NULL);
+
+ /*
+ * Setup UTL registers --BenH.
*/
if (ppc4xx_pciex_hwops->setup_utl)
ppc4xx_pciex_hwops->setup_utl(port);
@@ -1003,15 +1024,13 @@ static int __init ppc4xx_pciex_port_init(struct ppc4xx_pciex_port *port)
/*
* Check for VC0 active and assert RDY.
*/
- attempts = 10;
- while (!(mfdcri(SDR0, port->sdr_base + PESDRn_RCSSTS) & (1 << 16))) {
- if (!(attempts--)) {
- printk(KERN_INFO "PCIE%d: VC0 not active\n",
- port->index);
- return -1;
- }
- msleep(1000);
+ if (port->link &&
+ ppc4xx_pciex_wait_on_sdr(port, PESDRn_RCSSTS,
+ 1 << 16, 1 << 16, 5000)) {
+ printk(KERN_INFO "PCIE%d: VC0 not active\n", port->index);
+ port->link = 0;
}
+
mtdcri(SDR0, port->sdr_base + PESDRn_RCSSET,
mfdcri(SDR0, port->sdr_base + PESDRn_RCSSET) | 1 << 20);
msleep(100);
@@ -1048,6 +1067,10 @@ static int ppc4xx_pciex_validate_bdf(struct ppc4xx_pciex_port *port,
PCI_SLOT(devfn) != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
+ /* Check if we have a link */
+ if ((bus->number != port->hose->first_busno) && !port->link)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
return 0;
}
@@ -1092,6 +1115,9 @@ static int ppc4xx_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
gpl_cfg = dcr_read(port->dcrs, DCRO_PEGPL_CFG);
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg | GPL_DMER_MASK_DISA);
+ /* Make sure no CRS is recorded */
+ out_be32(port->utl_base + PEUTL_RCSTA, 0x00040000);
+
switch (len) {
case 1:
*val = in_8((u8 *)(addr + offset));
@@ -1109,6 +1135,14 @@ static int ppc4xx_pciex_read_config(struct pci_bus *bus, unsigned int devfn,
bus->number, hose->first_busno, hose->last_busno,
devfn, offset, len, addr + offset, *val);
+ /* Check for CRS (440SPe rev B does that for us but heh ..) */
+ if (in_be32(port->utl_base + PEUTL_RCSTA) & 0x00040000) {
+ pr_debug("Got CRS !\n");
+ if (len != 4 || offset != 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ *val = 0xffff0001;
+ }
+
dcr_write(port->dcrs, DCRO_PEGPL_CFG, gpl_cfg);
return PCIBIOS_SUCCESSFUL;
@@ -1278,8 +1312,11 @@ static void __init ppc4xx_pciex_port_setup_hose(struct ppc4xx_pciex_port *port)
void __iomem *mbase = NULL, *cfg_data = NULL;
/* XXX FIXME: Handle endpoint mode properly */
- if (port->endpoint)
+ if (port->endpoint) {
+ printk(KERN_WARNING "PCIE%d: Port in endpoint mode !\n",
+ port->index);
return;
+ }
/* Check if primary bridge */
if (of_get_property(port->node, "primary", NULL))
@@ -1424,6 +1461,9 @@ static void __init ppc4xx_probe_pciex_bridge(struct device_node *np)
}
port->sdr_base = *pval;
+ /* XXX Currently, we only support root complex mode */
+ port->endpoint = 0;
+
/* Fetch config space registers address */
if (of_address_to_resource(np, 0, &port->cfg_space)) {
printk(KERN_ERR "%s: Can't get PCI-E config space !",
@@ -1447,8 +1487,10 @@ static void __init ppc4xx_probe_pciex_bridge(struct device_node *np)
port->dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
/* Initialize the port specific registers */
- if (ppc4xx_pciex_port_init(port))
+ if (ppc4xx_pciex_port_init(port)) {
+ printk(KERN_WARNING "PCIE%d: Port init failed\n", port->index);
return;
+ }
/* Setup the linux hose data structure */
ppc4xx_pciex_port_setup_hose(port);
diff --git a/arch/powerpc/sysdev/ppc4xx_pci.h b/arch/powerpc/sysdev/ppc4xx_pci.h
index 43e51ce5c47..1c07908dc6e 100644
--- a/arch/powerpc/sysdev/ppc4xx_pci.h
+++ b/arch/powerpc/sysdev/ppc4xx_pci.h
@@ -330,6 +330,8 @@
/*
* Config space register offsets
*/
+#define PECFG_ECRTCTL 0x074
+
#define PECFG_BAR0LMPA 0x210
#define PECFG_BAR0HMPA 0x214
#define PECFG_BAR1MPA 0x218
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-22 05:36:24 +0000