diff options
Diffstat (limited to 'chip/ish/dma.c')
| -rw-r--r-- | chip/ish/dma.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/chip/ish/dma.c b/chip/ish/dma.c index eae6a850f1..48a27a0463 100644 --- a/chip/ish/dma.c +++ b/chip/ish/dma.c @@ -7,12 +7,34 @@ #include "common.h" #include "console.h" -#include "ish_dma.h" #include "registers.h" +#include "ish_dma.h" #include "util.h" static int dma_init_called; /* If ish_dma_init is called */ +static int dma_poll(uint32_t addr, uint32_t expected, uint32_t mask) +{ + int retval = -1; + uint32_t counter = 0; + + /* + * The timeout is approximately 2.2 seconds according to + * value of UINT32_MAX, 120MHZ ISH clock frequency and + * instruction count which is around 4. + */ + while (counter < (UINT32_MAX / 64)) { + /* test condition */ + if ((REG32(addr) & mask) == expected) { + retval = DMA_RC_OK; + break; + } + counter++; + } + + return retval; +} + void ish_dma_ocp_timeout_disable(void) { if (!IS_ENABLED(CONFIG_ISH_NEW_PM)) { @@ -22,6 +44,24 @@ void ish_dma_ocp_timeout_disable(void) } } +static inline uint32_t interrupt_lock(void) +{ + uint32_t eflags = 0; + __asm__ volatile("pushfl;" /* save eflag value */ + "popl %0;" + "cli;" + : "=r"(eflags)); /* shut off interrupts */ + return eflags; +} + +static inline void interrupt_unlock(uint32_t eflags) +{ + __asm__ volatile("pushl %0;" /* restore elfag values */ + "popfl;" + : + : "r"(eflags)); +} + void dma_configure_psize(void) { /* Give chan0 512 bytes for high performance, and chan1 128 bytes. */ |