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arm: socfpga: scan: Clean up scan_chain_engine_is_idle()

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Rework this function so it's clear that it is only polling for certain
bits to be cleared. Add kerneldoc. Fix it's return value to be either
0 on success and -ETIMEDOUT on error and propagate this through the
scan manager code.

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Dinh Nguyen <dinguyen@opensource.altera.com>
This commit is contained in:
Marek Vasut 2015-08-01 02:48:03 +02:00
parent cf96848bc7
commit aa5659ac65
2 changed files with 34 additions and 28 deletions
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9
arch/arm/mach-socfpga/include/mach/scan_manager.h
View file

@ -59,15 +59,6 @@ struct socfpga_scan_manager {
/* Position of second command byte for TDI_TDO packet */
#define TDI_TDO_HEADER_SECOND_BYTE_SHIFT 8
/*
* Maximum polling loop to wait for IO scan chain engine
* becomes idle to prevent infinite loop
*/
#define SCAN_MAX_DELAY 100
#define SCANMGR_STAT_ACTIVE_GET(x) (((x) & 0x80000000) >> 31)
#define SCANMGR_STAT_WFIFOCNT_GET(x) (((x) & 0x70000000) >> 28)
int scan_mgr_configure_iocsr(void);
int iocsr_get_config_table(const unsigned int chain_id,
const unsigned long **table,

53
arch/arm/mach-socfpga/scan_manager.c
View file

@ -5,10 +5,22 @@
*/
#include <common.h>
#include <errno.h>
#include <asm/io.h>
#include <asm/arch/freeze_controller.h>
#include <asm/arch/scan_manager.h>
/*
* Maximum polling loop to wait for IO scan chain engine becomes idle
* to prevent infinite loop. It is important that this is NOT changed
* to delay using timer functions, since at the time this function is
* called, timer might not yet be inited.
*/
#define SCANMGR_MAX_DELAY 100
#define SCANMGR_STAT_ACTIVE (1 << 31)
#define SCANMGR_STAT_WFIFOCNT_MASK 0x70000000
DECLARE_GLOBAL_DATA_PTR;
static const struct socfpga_scan_manager *scan_manager_base =
@ -16,26 +28,26 @@ static const struct socfpga_scan_manager *scan_manager_base =
static const struct socfpga_freeze_controller *freeze_controller_base =
(void *)(SOCFPGA_SYSMGR_ADDRESS + SYSMGR_FRZCTRL_ADDRESS);
/*
/**
* scan_chain_engine_is_idle() - Check if the JTAG scan chain is idle
* @max_iter: Maximum number of iterations to wait for idle
*
* Function to check IO scan chain engine status and wait if the engine is
* is active. Poll the IO scan chain engine till maximum iteration reached.
*/
static inline uint32_t scan_chain_engine_is_idle(uint32_t max_iter)
static u32 scan_chain_engine_is_idle(u32 max_iter)
{
uint32_t scanmgr_status;
const u32 mask = SCANMGR_STAT_ACTIVE | SCANMGR_STAT_WFIFOCNT_MASK;
u32 status;
scanmgr_status = readl(&scan_manager_base->stat);
/* Poll the engine until the scan engine is inactive */
while (SCANMGR_STAT_ACTIVE_GET(scanmgr_status) ||
(SCANMGR_STAT_WFIFOCNT_GET(scanmgr_status) > 0)) {
max_iter--;
if (max_iter > 0)
scanmgr_status = readl(&scan_manager_base->stat);
else
/* Poll the engine until the scan engine is inactive. */
do {
status = readl(&scan_manager_base->stat);
if (!(status & mask))
return 0;
}
return 1;
} while (max_iter--);
return -ETIMEDOUT;
}
/**
@ -70,8 +82,9 @@ static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
* Check if the scan chain engine is inactive and the
* WFIFO is empty before enabling the IO scan chain
*/
if (!scan_chain_engine_is_idle(SCAN_MAX_DELAY))
return 1;
ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
if (ret)
return ret;
/*
* Enable IO Scan chain based on scan chain id
@ -114,7 +127,8 @@ static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
* Check if the scan chain engine has completed the
* IO scan chain data shifting
*/
if (!scan_chain_engine_is_idle(SCAN_MAX_DELAY))
ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
if (ret)
goto error;
}
@ -185,7 +199,8 @@ static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
* Check if the scan chain engine has completed the
* IO scan chain data shifting
*/
if (!scan_chain_engine_is_idle(SCAN_MAX_DELAY))
ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
if (ret)
goto error;
}
@ -196,7 +211,7 @@ static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
error:
/* Disable IO Scan chain when error detected */
clrbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
return 1;
return ret;
}
int scan_mgr_configure_iocsr(void)