diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/coresight.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 255cfd283883..a269fffaf991 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -6,6 +6,8 @@ #ifndef _LINUX_CORESIGHT_H #define _LINUX_CORESIGHT_H +#include <linux/amba/bus.h> +#include <linux/clk.h> #include <linux/device.h> #include <linux/io.h> #include <linux/perf_event.h> @@ -386,6 +388,51 @@ static inline u32 csdev_access_relaxed_read32(struct csdev_access *csa, return csa->read(offset, true, false); } +#define CORESIGHT_CIDRn(i) (0xFF0 + ((i) * 4)) + +static inline u32 coresight_get_cid(void __iomem *base) +{ + u32 i, cid = 0; + + for (i = 0; i < 4; i++) + cid |= readl(base + CORESIGHT_CIDRn(i)) << (i * 8); + + return cid; +} + +static inline bool is_coresight_device(void __iomem *base) +{ + u32 cid = coresight_get_cid(base); + + return cid == CORESIGHT_CID; +} + +/* + * Attempt to find and enable "APB clock" for the given device + * + * Returns: + * + * clk - Clock is found and enabled + * NULL - clock is not found + * ERROR - Clock is found but failed to enable + */ +static inline struct clk *coresight_get_enable_apb_pclk(struct device *dev) +{ + struct clk *pclk; + int ret; + + pclk = clk_get(dev, "apb_pclk"); + if (IS_ERR(pclk)) + return NULL; + + ret = clk_prepare_enable(pclk); + if (ret) { + clk_put(pclk); + return ERR_PTR(ret); + } + return pclk; +} + #define CORESIGHT_PIDRn(i) (0xFE0 + ((i) * 4)) static inline u32 coresight_get_pid(struct csdev_access *csa) |