+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2013 Altera Corporation <www.altera.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/freeze_controller.h>
#include <asm/arch/scan_manager.h>
+#include <asm/arch/system_manager.h>
/*
* Maximum polling loop to wait for IO scan chain engine becomes idle
*/
#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 =
(void *)(SOCFPGA_SCANMGR_ADDRESS);
static const struct socfpga_freeze_controller *freeze_controller_base =
(void *)(SOCFPGA_SYSMGR_ADDRESS + SYSMGR_FRZCTRL_ADDRESS);
+static struct socfpga_system_manager *sys_mgr_base =
+ (struct socfpga_system_manager *)SOCFPGA_SYSMGR_ADDRESS;
/**
* scan_chain_engine_is_idle() - Check if the JTAG scan chain is idle
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);
+ }
+ }
+
+ 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);
+}
+
+/**
+ * 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)
{
- uint16_t tdi_tdo_header;
- uint32_t io_program_iter;
- uint32_t io_scan_chain_data_residual;
- uint32_t residual;
- uint32_t i, ret;
- uint32_t index = 0;
- uint32_t io_scan_chain_len_in_bits;
+ u32 io_scan_chain_len_in_bits;
const unsigned long *iocsr_scan_chain;
+ 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);
*/
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;
-
- /* 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);
+ /* 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;
- /*
- * 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;
- }
-
- /* Calculate array index for final TDI_TDO packet */
- index = io_program_iter * 4;
-
- /* Final TDI_TDO packet if any */
- if (io_scan_chain_data_residual) {
- /*
- * Calculate number of quad bytes FIFO write
- * needed for the final TDI_TDO packet
- */
- io_program_iter = io_scan_chain_data_residual >>
- IO_SCAN_CHAIN_32BIT_SHIFT;
-
- /*
- * 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++) {
- /*
- * 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);
- }
-
- index += io_program_iter;
- residual = io_scan_chain_data_residual &
- IO_SCAN_CHAIN_32BIT_MASK;
-
- if (IO_SCAN_CHAIN_PAYLOAD_24BIT < residual) {
- /*
- * write the last 4B scan chain data
- * into scan manager WFIFO
- */
- writel(iocsr_scan_chain[index],
- &scan_manager_base->fifo_quad_byte);
- } 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) {
- writel(((iocsr_scan_chain[index] >> i)
- & IO_SCAN_CHAIN_BYTE_MASK),
- &scan_manager_base->fifo_single_byte);
- }
- }
-
- /*
- * 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*/
status |= scan_mgr_io_scan_chain_prg(3);
return status;
}
+
+/**
+ * scan_mgr_get_fpga_id() - Obtain FPGA JTAG ID
+ *
+ * This function obtains JTAG ID from the FPGA TAP controller.
+ */
+u32 scan_mgr_get_fpga_id(void)
+{
+ const unsigned long data = 0;
+ u32 id = 0xffffffff;
+ int ret;
+
+ /* Enable HPS to talk to JTAG in the FPGA through the System Manager */
+ writel(0x1, &sys_mgr_base->scanmgrgrp_ctrl);
+
+ /* Enable port 7 */
+ writel(0x80, &scan_manager_base->en);
+ /* write to CSW to make s2f_ntrst reset */
+ writel(0x02, &scan_manager_base->stat);
+
+ /* Add a pause */
+ mdelay(1);
+
+ /* write 0x00 to CSW to clear the s2f_ntrst */
+ writel(0, &scan_manager_base->stat);
+
+ /*
+ * Go to Test-Logic-Reset state.
+ * This sets TAP controller into IDCODE mode.
+ */
+ scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_TMS, 0x1f | (1 << 5), 0x0);
+
+ /* Go to Run-Test/Idle -> DR-Scan -> Capture-DR -> Shift-DR state. */
+ scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_TMS, 0x02 | (1 << 4), 0x0);
+
+ /*
+ * Push 4 bytes of data through TDI->DR->TDO.
+ *
+ * Length of TDI data is 32bits (length - 1) and they are only
+ * zeroes as we care only for TDO data.
+ */
+ ret = scan_mgr_jtag_insn_data(0x4, &data, 32);
+ /* Read 32 bit from captured JTAG data. */
+ if (!ret)
+ id = readl(&scan_manager_base->fifo_quad_byte);
+
+ /* Disable all port */
+ writel(0, &scan_manager_base->en);
+ writel(0, &sys_mgr_base->scanmgrgrp_ctrl);
+
+ return id;
+}
projects / oweals / u-boot.git / blobdiff