@@ -26,19 +26,36 @@
#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
-static const struct amba_id *
-amba_lookup(const struct amba_id *table, struct amba_device *dev)
+/* called on periphid match and class 0x9 coresight device. */
+static int
+amba_cs_uci_id_match(const struct amba_id *table, struct amba_device *dev)
{
int ret = 0;
+ struct amba_cs_uci_id *uci;
+
+ uci = table->data;
+ /* no table data or zero mask - return match on periphid */
+ if (!uci || (uci->devarch_mask == 0))
+ return 1;
+
+ /* test against read devtype and masked devarch value */
+ ret = (dev->uci.devtype == uci->devtype) &&
+ ((dev->uci.devarch & uci->devarch_mask) == uci->devarch);
+ return ret;
+}
+
+static const struct amba_id *
+amba_lookup(const struct amba_id *table, struct amba_device *dev)
+{
while (table->mask) {
- ret = (dev->periphid & table->mask) == table->id;
- if (ret)
- break;
+ if (((dev->periphid & table->mask) == table->id) &&
+ ((dev->cid != CORESIGHT_CID) ||
+ (amba_cs_uci_id_match(table, dev))))
+ return table;
table++;
}
-
- return ret ? table : NULL;
+ return NULL;
}
static int amba_match(struct device *dev, struct device_driver *drv)
@@ -399,10 +416,22 @@ static int amba_device_try_add(struct amba_device *dev, struct resource *parent)
cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
(i * 8);
+ if (cid == CORESIGHT_CID) {
+ /* set the base to the start of the last 4k block */
+ void __iomem *csbase = tmp + size - 4096;
+
+ dev->uci.devarch =
+ readl(csbase + UCI_REG_DEVARCH_OFFSET);
+ dev->uci.devtype =
+ readl(csbase + UCI_REG_DEVTYPE_OFFSET) & 0xff;
+ }
+
amba_put_disable_pclk(dev);
- if (cid == AMBA_CID || cid == CORESIGHT_CID)
+ if (cid == AMBA_CID || cid == CORESIGHT_CID) {
dev->periphid = pid;
+ dev->cid = cid;
+ }
if (!dev->periphid)
ret = -ENODEV;
@@ -58,6 +58,10 @@ struct amba_cs_uci_id {
void *data;
};
+/* define offsets for registers used by UCI */
+#define UCI_REG_DEVTYPE_OFFSET 0xFCC
+#define UCI_REG_DEVARCH_OFFSET 0xFBC
+
struct clk;
struct amba_device {
@@ -65,6 +69,8 @@ struct amba_device {
struct resource res;
struct clk *pclk;
unsigned int periphid;
+ unsigned int cid;
+ struct amba_cs_uci_id uci;
unsigned int irq[AMBA_NR_IRQS];
char *driver_override;
};
The patches provide an update of amba_device and matching code to handle the additional registers required for the Class 0x9 (CoreSight) UCI. The *data pointer in the amba_id is used by the driver to provide extended ID register values for matching. CoreSight components where PID/CID pair is currently sufficient for unique identification need not provide this additional information. Signed-off-by: Mike Leach <mike.leach@linaro.org> --- drivers/amba/bus.c | 45 +++++++++++++++++++++++++++++++++------- include/linux/amba/bus.h | 6 ++++++ 2 files changed, 43 insertions(+), 8 deletions(-) -- 2.19.1