From: Javier Jalle <javier.ja...@gaisler.com>
---
c/src/lib/libbsp/sparc/shared/include/grpci2.h | 4 ++++
c/src/lib/libbsp/sparc/shared/pci/grpci2.c | 16 ++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/c/src/lib/libbsp/sparc/shared/include/grpci2.h
b/c/src/lib/libbsp/sparc/shared/include/grpci2.h
index 624191e..c356b56 100644
--- a/c/src/lib/libbsp/sparc/shared/include/grpci2.h
+++ b/c/src/lib/libbsp/sparc/shared/include/grpci2.h
@@ -36,6 +36,10 @@ extern void grpci2_register_drv(void);
* ============================
* Name="byteTwisting", Type=INT, Enable/Disable Bytetwisting by hardware
*
+ * PCI Latency timer
+ * ============================
+ * Name="latencyTimer", Type=INT, Set the latency timer
+ *
* PCI Host's Target BARs setup
* ============================
* The Host's BARs are not configured by the configuration routines, by default
diff --git a/c/src/lib/libbsp/sparc/shared/pci/grpci2.c
b/c/src/lib/libbsp/sparc/shared/pci/grpci2.c
index 7fca3cd..be459cc 100644
--- a/c/src/lib/libbsp/sparc/shared/pci/grpci2.c
+++ b/c/src/lib/libbsp/sparc/shared/pci/grpci2.c
@@ -57,6 +57,9 @@
/* If defined to 1 - byte twisting is enabled by default */
#define DEFAULT_BT_ENABLED 0
+/* If defined to 64 - Latency timer is 64 by default */
+#define DEFAULT_LATENCY_TIMER 64
+
/* Interrupt assignment. Set to other value than 0xff in order to
* override defaults and plug&play information
*/
@@ -237,6 +240,7 @@ struct grpci2_priv {
char irq_mode; /* IRQ Mode from CAPSTS REG */
char bt_enabled;
unsigned int irq_mask;
+ unsigned int latency_timer;
struct grpci2_pcibar_cfg *barcfg;
@@ -696,6 +700,12 @@ static int grpci2_hw_init(struct grpci2_priv *priv)
data |= (PCIM_CMD_MEMEN | PCIM_CMD_BUSMASTEREN);
grpci2_cfg_w32(host, PCIR_COMMAND, data);
+ /* set latency timer */
+ grpci2_cfg_r32(host, PCIR_CACHELNSZ, &data);
+ data &= ~0xff00;
+ data |= ((priv->latency_timer & 0xff) << 8);
+ grpci2_cfg_w32(host, PCIR_CACHELNSZ, data);
+
/* Enable Error respone (CPU-TRAP) on illegal memory access */
regs->ctrl = CTRL_ER | CTRL_PE;
@@ -733,6 +743,7 @@ static int grpci2_init(struct grpci2_priv *priv)
priv->regs = (struct grpci2_regs *)apb->start;
priv->bt_enabled = DEFAULT_BT_ENABLED;
priv->irq_mode = (priv->regs->sts_cap & STS_IRQMODE) >> STS_IRQMODE_BIT;
+ priv->latency_timer = DEFAULT_LATENCY_TIMER;
/* Calculate the PCI windows
* AMBA->PCI Window: AHB SLAVE AREA0
@@ -791,6 +802,11 @@ static int grpci2_init(struct grpci2_priv *priv)
else
priv->barcfg = grpci2_default_bar_mapping;
+ /* User may override DEFAULT_LATENCY_TIMER */
+ value = drvmgr_dev_key_get(priv->dev, "latencyTimer", DRVMGR_KT_INT);
+ if (value)
+ priv->latency_timer = value->i;
+
/* This driver only support HOST systems, we check that it can act as a
* PCI Master and that it is in the Host slot. */
if ((priv->regs->sts_cap&STS_HOST) || !(priv->regs->sts_cap&STS_MST))
--
2.7.4
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