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arm: socfpga: scan: Factor out IO chain programming

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Factor out the code which sends JTAG instruction followed by data
into separate function to tidy the code up a little.

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 14:28:48 +02:00
parent 62a0c9cff3
commit 5e19b68aa1
1 changed files with 42 additions and 71 deletions
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113
arch/arm/mach-socfpga/scan_manager.c
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@ -101,16 +101,47 @@ static void scan_mgr_jtag_io(const u32 flags, const u8 iarg, const u32 parg)
writel(data & 0xff, &scan_manager_base->fifo_single_byte);
}
/**
* scan_mgr_jtag_insn_data() - Send JTAG instruction and data
* @iarg: Instruction argument
* @data: Associated data
* @dlen: Length of data in bits
*
* This function is used when programming the IO chains to submit the
* instruction followed by variable length payload.
*/
static int
scan_mgr_jtag_insn_data(const u8 iarg, const unsigned long *data,
const unsigned int dlen)
{
int i, j;
scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, iarg, dlen - 1);
/* 32 bits or more remain */
for (i = 0; i < dlen / 32; i++)
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, data[i]);
if ((dlen % 32) > 24) { /* 31...24 bits remain */
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, data[i]);
} else if (dlen % 32) { /* 24...1 bit remain */
for (j = 0; j < dlen % 32; j += 8)
scan_mgr_jtag_io(0, 0x0, data[i] >> j);
}
return scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
}
/**
* scan_mgr_io_scan_chain_prg() - Program HPS IO Scan Chain
* @io_scan_chain_id: IO scan chain ID
*/
static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
{
u32 residual;
u32 io_scan_chain_len_in_bits;
const unsigned long *iocsr_scan_chain;
int i, ret, index = 0;
unsigned int rem, idx = 0;
int ret;
ret = iocsr_get_config_table(io_scan_chain_id, &iocsr_scan_chain,
&io_scan_chain_len_in_bits);
@ -139,78 +170,18 @@ static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
*/
setbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
/* Program IO scan chain in 128-bit iteration */
for (i = 0; i < io_scan_chain_len_in_bits / 128; i++) {
/* Write TDI_TDO packet header for 128-bit IO scan chain */
scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, 0x0,
TDI_TDO_MAX_PAYLOAD);
/* Program IO scan chain. */
while (io_scan_chain_len_in_bits) {
if (io_scan_chain_len_in_bits > 128)
rem = 128;
else
rem = io_scan_chain_len_in_bits;
/* write 4 successive 32-bit IO scan chain data into WFIFO */
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
/*
* Check if the scan chain engine has completed the
* IO scan chain data shifting
*/
ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
if (ret)
goto error;
}
residual = io_scan_chain_len_in_bits % 128;
/* Final TDI_TDO packet (if chain length is not aligned to 128 bits) */
if (residual) {
/*
* Program the last part of IO scan chain write TDI_TDO
* packet header (2 bytes) to scan manager.
*/
scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, 0x0,
residual - 1);
for (i = 0; i < residual / 32; i++) {
/*
* write remaining scan chain data into scan
* manager WFIFO with 4 bytes write
*/
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
iocsr_scan_chain[index++]);
}
residual = io_scan_chain_len_in_bits % 32;
if (residual > 24) {
/*
* write the last 4B scan chain data
* into scan manager WFIFO
*/
scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
iocsr_scan_chain[index]);
} else {
/*
* write the remaining 1 - 3 bytes scan chain
* data into scan manager WFIFO byte by byte
* to prevent JTAG engine shifting unused data
* from the FIFO and mistaken the data as a
* valid command (even though unused bits are
* set to 0, but just to prevent hardware
* glitch)
*/
for (i = 0; i < residual; i += 8) {
scan_mgr_jtag_io(0, 0x0,
iocsr_scan_chain[index] >> i);
}
}
/*
* Check if the scan chain engine has completed the
* IO scan chain data shifting
*/
ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
ret = scan_mgr_jtag_insn_data(0x0, &iocsr_scan_chain[idx], rem);
if (ret)
goto error;
io_scan_chain_len_in_bits -= rem;
idx += 4;
}
/* Disable IO Scan chain when configuration done*/