*/
#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
+
+/*
+ * Maximum length of TDI_TDO packet payload is 128 bits,
+ * represented by (length - 1) in TDI_TDO header.
+ */
+#define TDI_TDO_MAX_PAYLOAD 127
+
+#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 =
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;
-
- scanmgr_status = readl(&scan_manager_base->stat);
+ const u32 mask = SCANMGR_STAT_ACTIVE | SCANMGR_STAT_WFIFOCNT_MASK;
+ u32 status;
- /* 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;
+ } while (max_iter--);
+
+ return -ETIMEDOUT;
+}
+
+#define JTAG_BP_INSN (1 << 0)
+#define JTAG_BP_TMS (1 << 1)
+#define JTAG_BP_PAYLOAD (1 << 2)
+#define JTAG_BP_2BYTE (1 << 3)
+#define JTAG_BP_4BYTE (1 << 4)
+
+/**
+ * scan_mgr_jtag_io() - Access the JTAG chain
+ * @flags: Control flags, used to configure the action on the JTAG
+ * @iarg: Instruction argument
+ * @parg: Payload argument or data
+ *
+ * Perform I/O on the JTAG chain
+ */
+static void scan_mgr_jtag_io(const u32 flags, const u8 iarg, const u32 parg)
+{
+ u32 data = parg;
+
+ if (flags & JTAG_BP_INSN) { /* JTAG instruction */
+ /*
+ * The SCC JTAG register is LSB first, so make
+ * space for the instruction at the LSB.
+ */
+ data <<= 8;
+ if (flags & JTAG_BP_TMS) {
+ data |= (0 << 7); /* TMS instruction. */
+ data |= iarg & 0x3f; /* TMS arg is 6 bits. */
+ if (flags & JTAG_BP_PAYLOAD)
+ data |= (1 << 6);
+ } else {
+ data |= (1 << 7); /* TDI/TDO instruction. */
+ data |= iarg & 0xf; /* TDI/TDO arg is 4 bits. */
+ if (flags & JTAG_BP_PAYLOAD)
+ data |= (1 << 4);
+ }
}
- return 1;
+
+ if (flags & JTAG_BP_4BYTE)
+ writel(data, &scan_manager_base->fifo_quad_byte);
+ else if (flags & JTAG_BP_2BYTE)
+ writel(data & 0xffff, &scan_manager_base->fifo_double_byte);
+ else
+ writel(data & 0xff, &scan_manager_base->fifo_single_byte);
}
-/* Program HPS IO Scan Chain */
-uint32_t scan_mgr_io_scan_chain_prg(
- uint32_t io_scan_chain_id,
- uint32_t io_scan_chain_len_in_bits,
- const uint32_t *iocsr_scan_chain)
+/**
+ * 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)
{
- uint16_t tdi_tdo_header;
- uint32_t io_program_iter;
- uint32_t io_scan_chain_data_residual;
- uint32_t residual;
- uint32_t i;
- uint32_t index = 0;
+ u32 residual;
+ u32 io_scan_chain_len_in_bits;
+ const unsigned long *iocsr_scan_chain;
+ int i, ret, index = 0;
+
+ ret = iocsr_get_config_table(io_scan_chain_id, &iocsr_scan_chain,
+ &io_scan_chain_len_in_bits);
+ if (ret)
+ return 1;
/*
* De-assert reinit if the IO scan chain is intended for HIO. In
* 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
*/
setbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
- /*
- * Calculate number of iteration needed for full 128-bit (4 x32-bits)
- * bits shifting. Each TDI_TDO packet can shift in maximum 128-bits
- */
- io_program_iter = io_scan_chain_len_in_bits >>
- IO_SCAN_CHAIN_128BIT_SHIFT;
- io_scan_chain_data_residual = io_scan_chain_len_in_bits &
- IO_SCAN_CHAIN_128BIT_MASK;
-
- /* Construct TDI_TDO packet for 128-bit IO scan chain (2 bytes) */
- tdi_tdo_header = TDI_TDO_HEADER_FIRST_BYTE |
- (TDI_TDO_MAX_PAYLOAD << TDI_TDO_HEADER_SECOND_BYTE_SHIFT);
-
/* Program IO scan chain in 128-bit iteration */
- for (i = 0; i < io_program_iter; i++) {
- /* write TDI_TDO packet header to scan manager */
- writel(tdi_tdo_header, &scan_manager_base->fifo_double_byte);
-
- /* calculate array index. Multiply by 4 as write 4 x 32bits */
- index = i * 4;
+ 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);
/* write 4 successive 32-bit IO scan chain data into WFIFO */
- writel(iocsr_scan_chain[index],
- &scan_manager_base->fifo_quad_byte);
- writel(iocsr_scan_chain[index + 1],
- &scan_manager_base->fifo_quad_byte);
- writel(iocsr_scan_chain[index + 2],
- &scan_manager_base->fifo_quad_byte);
- writel(iocsr_scan_chain[index + 3],
- &scan_manager_base->fifo_quad_byte);
+ 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
*/
- if (!scan_chain_engine_is_idle(SCAN_MAX_DELAY))
+ ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
+ if (ret)
goto error;
}
- /* Calculate array index for final TDI_TDO packet */
- index = io_program_iter * 4;
+ residual = io_scan_chain_len_in_bits % 128;
- /* Final TDI_TDO packet if any */
- if (io_scan_chain_data_residual) {
+ /* Final TDI_TDO packet (if chain length is not aligned to 128 bits) */
+ if (residual) {
/*
- * Calculate number of quad bytes FIFO write
- * needed for the final TDI_TDO packet
+ * Program the last part of IO scan chain write TDI_TDO
+ * packet header (2 bytes) to scan manager.
*/
- io_program_iter = io_scan_chain_data_residual >>
- IO_SCAN_CHAIN_32BIT_SHIFT;
+ scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, 0x0,
+ residual - 1);
- /*
- * Construct TDI_TDO packet for remaining IO
- * scan chain (2 bytes)
- */
- tdi_tdo_header = TDI_TDO_HEADER_FIRST_BYTE |
- ((io_scan_chain_data_residual - 1) <<
- TDI_TDO_HEADER_SECOND_BYTE_SHIFT);
-
- /*
- * Program the last part of IO scan chain write TDI_TDO packet
- * header (2 bytes) to scan manager
- */
- writel(tdi_tdo_header, &scan_manager_base->fifo_double_byte);
-
- for (i = 0; i < io_program_iter; i++) {
+ for (i = 0; i < residual / 32; i++) {
/*
* write remaining scan chain data into scan
* manager WFIFO with 4 bytes write
- */
- writel(iocsr_scan_chain[index + i],
- &scan_manager_base->fifo_quad_byte);
+ */
+ scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
+ iocsr_scan_chain[index++]);
}
- index += io_program_iter;
- residual = io_scan_chain_data_residual &
- IO_SCAN_CHAIN_32BIT_MASK;
-
- if (IO_SCAN_CHAIN_PAYLOAD_24BIT < residual) {
+ residual = io_scan_chain_len_in_bits % 32;
+ if (residual > 24) {
/*
* write the last 4B scan chain data
* into scan manager WFIFO
*/
- writel(iocsr_scan_chain[index],
- &scan_manager_base->fifo_quad_byte);
+ scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
+ iocsr_scan_chain[index]);
} else {
/*
* write the remaining 1 - 3 bytes scan chain
* glitch)
*/
for (i = 0; i < residual; i += 8) {
- writel(((iocsr_scan_chain[index] >> i)
- & IO_SCAN_CHAIN_BYTE_MASK),
- &scan_manager_base->fifo_single_byte);
+ 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
*/
- if (!scan_chain_engine_is_idle(SCAN_MAX_DELAY))
+ ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
+ if (ret)
goto error;
}
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)
int status = 0;
/* configure the IOCSR through scan chain */
- status |= scan_mgr_io_scan_chain_prg(0,
- CONFIG_HPS_IOCSR_SCANCHAIN0_LENGTH, iocsr_scan_chain0_table);
- status |= scan_mgr_io_scan_chain_prg(1,
- CONFIG_HPS_IOCSR_SCANCHAIN1_LENGTH, iocsr_scan_chain1_table);
- status |= scan_mgr_io_scan_chain_prg(2,
- CONFIG_HPS_IOCSR_SCANCHAIN2_LENGTH, iocsr_scan_chain2_table);
- status |= scan_mgr_io_scan_chain_prg(3,
- CONFIG_HPS_IOCSR_SCANCHAIN3_LENGTH, iocsr_scan_chain3_table);
+ status |= scan_mgr_io_scan_chain_prg(0);
+ status |= scan_mgr_io_scan_chain_prg(1);
+ status |= scan_mgr_io_scan_chain_prg(2);
+ status |= scan_mgr_io_scan_chain_prg(3);
return status;
}
projects / karo-tx-uboot.git / blobdiff