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ARM: 8836/1: drivers: amba: Update component matching to use the CoreSight UCI values. 

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>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Mike Leach 2019-02-13 14:41:50 +01:00 committed by Russell King
parent e85fa28ebc
commit 4a2910fa80
2 changed files with 43 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/amba/bus.c
View File

@ -26,19 +26,36 @@
#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
/* 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)
{
int ret = 0;
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;

6
include/linux/amba/bus.h
View File

@ -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;
};