2 * Copyright (C) 2013 Altera Corporation <www.altera.com>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/freeze_controller.h>
11 #include <asm/arch/scan_manager.h>
14 * Maximum polling loop to wait for IO scan chain engine becomes idle
15 * to prevent infinite loop. It is important that this is NOT changed
16 * to delay using timer functions, since at the time this function is
17 * called, timer might not yet be inited.
19 #define SCANMGR_MAX_DELAY 100
21 #define SCANMGR_STAT_ACTIVE (1 << 31)
22 #define SCANMGR_STAT_WFIFOCNT_MASK 0x70000000
24 DECLARE_GLOBAL_DATA_PTR;
26 static const struct socfpga_scan_manager *scan_manager_base =
27 (void *)(SOCFPGA_SCANMGR_ADDRESS);
28 static const struct socfpga_freeze_controller *freeze_controller_base =
29 (void *)(SOCFPGA_SYSMGR_ADDRESS + SYSMGR_FRZCTRL_ADDRESS);
32 * scan_chain_engine_is_idle() - Check if the JTAG scan chain is idle
33 * @max_iter: Maximum number of iterations to wait for idle
35 * Function to check IO scan chain engine status and wait if the engine is
36 * is active. Poll the IO scan chain engine till maximum iteration reached.
38 static u32 scan_chain_engine_is_idle(u32 max_iter)
40 const u32 mask = SCANMGR_STAT_ACTIVE | SCANMGR_STAT_WFIFOCNT_MASK;
43 /* Poll the engine until the scan engine is inactive. */
45 status = readl(&scan_manager_base->stat);
53 #define JTAG_BP_INSN (1 << 0)
54 #define JTAG_BP_TMS (1 << 1)
55 #define JTAG_BP_PAYLOAD (1 << 2)
56 #define JTAG_BP_2BYTE (1 << 3)
57 #define JTAG_BP_4BYTE (1 << 4)
60 * scan_mgr_jtag_io() - Access the JTAG chain
61 * @flags: Control flags, used to configure the action on the JTAG
62 * @iarg: Instruction argument
63 * @parg: Payload argument or data
65 * Perform I/O on the JTAG chain
67 static void scan_mgr_jtag_io(const u32 flags, const u8 iarg, const u32 parg)
71 if (flags & JTAG_BP_INSN) { /* JTAG instruction */
73 * The SCC JTAG register is LSB first, so make
74 * space for the instruction at the LSB.
77 if (flags & JTAG_BP_TMS) {
78 data |= (0 << 7); /* TMS instruction. */
79 data |= iarg & 0x3f; /* TMS arg is 6 bits. */
80 if (flags & JTAG_BP_PAYLOAD)
83 data |= (1 << 7); /* TDI/TDO instruction. */
84 data |= iarg & 0xf; /* TDI/TDO arg is 4 bits. */
85 if (flags & JTAG_BP_PAYLOAD)
90 if (flags & JTAG_BP_4BYTE)
91 writel(data, &scan_manager_base->fifo_quad_byte);
92 else if (flags & JTAG_BP_2BYTE)
93 writel(data & 0xffff, &scan_manager_base->fifo_double_byte);
95 writel(data & 0xff, &scan_manager_base->fifo_single_byte);
99 * scan_mgr_io_scan_chain_prg() - Program HPS IO Scan Chain
100 * @io_scan_chain_id: IO scan chain ID
102 static int scan_mgr_io_scan_chain_prg(const unsigned int io_scan_chain_id)
104 uint32_t io_program_iter;
105 uint32_t io_scan_chain_data_residual;
109 uint32_t io_scan_chain_len_in_bits;
110 const unsigned long *iocsr_scan_chain;
112 ret = iocsr_get_config_table(io_scan_chain_id, &iocsr_scan_chain,
113 &io_scan_chain_len_in_bits);
118 * De-assert reinit if the IO scan chain is intended for HIO. In
119 * this, its the chain 3.
121 if (io_scan_chain_id == 3)
122 clrbits_le32(&freeze_controller_base->hioctrl,
123 SYSMGR_FRZCTRL_HIOCTRL_DLLRST_MASK);
126 * Check if the scan chain engine is inactive and the
127 * WFIFO is empty before enabling the IO scan chain
129 ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
134 * Enable IO Scan chain based on scan chain id
135 * Note: only one chain can be enabled at a time
137 setbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
140 * Calculate number of iteration needed for full 128-bit (4 x32-bits)
141 * bits shifting. Each TDI_TDO packet can shift in maximum 128-bits
143 io_program_iter = io_scan_chain_len_in_bits >>
144 IO_SCAN_CHAIN_128BIT_SHIFT;
145 io_scan_chain_data_residual = io_scan_chain_len_in_bits &
146 IO_SCAN_CHAIN_128BIT_MASK;
148 /* Program IO scan chain in 128-bit iteration */
149 for (i = 0; i < io_program_iter; i++) {
150 /* Write TDI_TDO packet header for 128-bit IO scan chain */
151 scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, 0x0,
152 TDI_TDO_MAX_PAYLOAD);
154 /* write 4 successive 32-bit IO scan chain data into WFIFO */
155 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
156 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
157 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
158 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0, iocsr_scan_chain[index++]);
161 * Check if the scan chain engine has completed the
162 * IO scan chain data shifting
164 ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
169 /* Final TDI_TDO packet if any */
170 if (io_scan_chain_data_residual) {
172 * Calculate number of quad bytes FIFO write
173 * needed for the final TDI_TDO packet
175 io_program_iter = io_scan_chain_data_residual >>
176 IO_SCAN_CHAIN_32BIT_SHIFT;
179 * Program the last part of IO scan chain write TDI_TDO
180 * packet header (2 bytes) to scan manager.
182 scan_mgr_jtag_io(JTAG_BP_INSN | JTAG_BP_2BYTE, 0x0,
183 io_scan_chain_data_residual - 1);
185 for (i = 0; i < io_program_iter; i++) {
187 * write remaining scan chain data into scan
188 * manager WFIFO with 4 bytes write
190 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
191 iocsr_scan_chain[index++]);
194 residual = io_scan_chain_data_residual &
195 IO_SCAN_CHAIN_32BIT_MASK;
197 if (IO_SCAN_CHAIN_PAYLOAD_24BIT < residual) {
199 * write the last 4B scan chain data
200 * into scan manager WFIFO
202 scan_mgr_jtag_io(JTAG_BP_4BYTE, 0x0,
203 iocsr_scan_chain[index]);
206 * write the remaining 1 - 3 bytes scan chain
207 * data into scan manager WFIFO byte by byte
208 * to prevent JTAG engine shifting unused data
209 * from the FIFO and mistaken the data as a
210 * valid command (even though unused bits are
211 * set to 0, but just to prevent hardware
214 for (i = 0; i < residual; i += 8) {
215 scan_mgr_jtag_io(0, 0x0,
216 iocsr_scan_chain[index] >> i);
221 * Check if the scan chain engine has completed the
222 * IO scan chain data shifting
224 ret = scan_chain_engine_is_idle(SCANMGR_MAX_DELAY);
229 /* Disable IO Scan chain when configuration done*/
230 clrbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
234 /* Disable IO Scan chain when error detected */
235 clrbits_le32(&scan_manager_base->en, 1 << io_scan_chain_id);
239 int scan_mgr_configure_iocsr(void)
243 /* configure the IOCSR through scan chain */
244 status |= scan_mgr_io_scan_chain_prg(0);
245 status |= scan_mgr_io_scan_chain_prg(1);
246 status |= scan_mgr_io_scan_chain_prg(2);
247 status |= scan_mgr_io_scan_chain_prg(3);