1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * AXS101/AXS103 Software Development Platform
4 *
5 * Copyright (C) 2013-15 Synopsys, Inc. (www.synopsys.com)
6 */
7
8 #include <linux/of_fdt.h>
9 #include <linux/of_platform.h>
10 #include <linux/libfdt.h>
11
12 #include <asm/asm-offsets.h>
13 #include <asm/io.h>
14 #include <asm/mach_desc.h>
15 #include <soc/arc/mcip.h>
16
17 #define AXS_MB_CGU 0xE0010000
18 #define AXS_MB_CREG 0xE0011000
19
20 #define CREG_MB_IRQ_MUX (AXS_MB_CREG + 0x214)
21 #define CREG_MB_SW_RESET (AXS_MB_CREG + 0x220)
22 #define CREG_MB_VER (AXS_MB_CREG + 0x230)
23 #define CREG_MB_CONFIG (AXS_MB_CREG + 0x234)
24
25 #define AXC001_CREG 0xF0001000
26 #define AXC001_GPIO_INTC 0xF0003000
27
axs10x_enable_gpio_intc_wire(void)28 static void __init axs10x_enable_gpio_intc_wire(void)
29 {
30 /*
31 * Peripherals on CPU Card and Mother Board are wired to cpu intc via
32 * intermediate DW APB GPIO blocks (mainly for debouncing)
33 *
34 * ---------------------
35 * | snps,arc700-intc |
36 * ---------------------
37 * | #7 | #15
38 * ------------------- -------------------
39 * | snps,dw-apb-gpio | | snps,dw-apb-gpio |
40 * ------------------- -------------------
41 * | #12 |
42 * | [ Debug UART on cpu card ]
43 * |
44 * ------------------------
45 * | snps,dw-apb-intc (MB)|
46 * ------------------------
47 * | | | |
48 * [eth] [uart] [... other perip on Main Board]
49 *
50 * Current implementation of "irq-dw-apb-ictl" driver doesn't work well
51 * with stacked INTCs. In particular problem happens if its master INTC
52 * not yet instantiated. See discussion here -
53 * https://lkml.org/lkml/2015/3/4/755
54 *
55 * So setup the first gpio block as a passive pass thru and hide it from
56 * DT hardware topology - connect MB intc directly to cpu intc
57 * The GPIO "wire" needs to be init nevertheless (here)
58 *
59 * One side adv is that peripheral interrupt handling avoids one nested
60 * intc ISR hop
61 */
62 #define GPIO_INTEN (AXC001_GPIO_INTC + 0x30)
63 #define GPIO_INTMASK (AXC001_GPIO_INTC + 0x34)
64 #define GPIO_INTTYPE_LEVEL (AXC001_GPIO_INTC + 0x38)
65 #define GPIO_INT_POLARITY (AXC001_GPIO_INTC + 0x3c)
66 #define MB_TO_GPIO_IRQ 12
67
68 iowrite32(~(1 << MB_TO_GPIO_IRQ), (void __iomem *) GPIO_INTMASK);
69 iowrite32(0, (void __iomem *) GPIO_INTTYPE_LEVEL);
70 iowrite32(~0, (void __iomem *) GPIO_INT_POLARITY);
71 iowrite32(1 << MB_TO_GPIO_IRQ, (void __iomem *) GPIO_INTEN);
72 }
73
axs10x_print_board_ver(unsigned int creg,const char * str)74 static void __init axs10x_print_board_ver(unsigned int creg, const char *str)
75 {
76 union ver {
77 struct {
78 #ifdef CONFIG_CPU_BIG_ENDIAN
79 unsigned int pad:11, y:12, m:4, d:5;
80 #else
81 unsigned int d:5, m:4, y:12, pad:11;
82 #endif
83 };
84 unsigned int val;
85 } board;
86
87 board.val = ioread32((void __iomem *)creg);
88 pr_info("AXS: %s FPGA Date: %u-%u-%u\n", str, board.d, board.m,
89 board.y);
90 }
91
axs10x_early_init(void)92 static void __init axs10x_early_init(void)
93 {
94 int mb_rev;
95 char mb[32];
96
97 /* Determine motherboard version */
98 if (ioread32((void __iomem *) CREG_MB_CONFIG) & (1 << 28))
99 mb_rev = 3; /* HT-3 (rev3.0) */
100 else
101 mb_rev = 2; /* HT-2 (rev2.0) */
102
103 axs10x_enable_gpio_intc_wire();
104
105 scnprintf(mb, 32, "MainBoard v%d", mb_rev);
106 axs10x_print_board_ver(CREG_MB_VER, mb);
107 }
108
109 #ifdef CONFIG_AXS101
110
111 #define CREG_CPU_ADDR_770 (AXC001_CREG + 0x20)
112 #define CREG_CPU_ADDR_TUNN (AXC001_CREG + 0x60)
113 #define CREG_CPU_ADDR_770_UPD (AXC001_CREG + 0x34)
114 #define CREG_CPU_ADDR_TUNN_UPD (AXC001_CREG + 0x74)
115
116 #define CREG_CPU_ARC770_IRQ_MUX (AXC001_CREG + 0x114)
117 #define CREG_CPU_GPIO_UART_MUX (AXC001_CREG + 0x120)
118
119 /*
120 * Set up System Memory Map for ARC cpu / peripherals controllers
121 *
122 * Each AXI master has a 4GB memory map specified as 16 apertures of 256MB, each
123 * of which maps to a corresponding 256MB aperture in Target slave memory map.
124 *
125 * e.g. ARC cpu AXI Master's aperture 8 (0x8000_0000) is mapped to aperture 0
126 * (0x0000_0000) of DDR Port 0 (slave #1)
127 *
128 * Access from cpu to MB controllers such as GMAC is setup using AXI Tunnel:
129 * which has master/slaves on both ends.
130 * e.g. aperture 14 (0xE000_0000) of ARC cpu is mapped to aperture 14
131 * (0xE000_0000) of CPU Card AXI Tunnel slave (slave #3) which is mapped to
132 * MB AXI Tunnel Master, which also has a mem map setup
133 *
134 * In the reverse direction, MB AXI Masters (e.g. GMAC) mem map is setup
135 * to map to MB AXI Tunnel slave which connects to CPU Card AXI Tunnel Master
136 */
137 struct aperture {
138 unsigned int slave_sel:4, slave_off:4, pad:24;
139 };
140
141 /* CPU Card target slaves */
142 #define AXC001_SLV_NONE 0
143 #define AXC001_SLV_DDR_PORT0 1
144 #define AXC001_SLV_SRAM 2
145 #define AXC001_SLV_AXI_TUNNEL 3
146 #define AXC001_SLV_AXI2APB 6
147 #define AXC001_SLV_DDR_PORT1 7
148
149 /* MB AXI Target slaves */
150 #define AXS_MB_SLV_NONE 0
151 #define AXS_MB_SLV_AXI_TUNNEL_CPU 1
152 #define AXS_MB_SLV_AXI_TUNNEL_HAPS 2
153 #define AXS_MB_SLV_SRAM 3
154 #define AXS_MB_SLV_CONTROL 4
155
156 /* MB AXI masters */
157 #define AXS_MB_MST_TUNNEL_CPU 0
158 #define AXS_MB_MST_USB_OHCI 10
159
160 /*
161 * memmap for ARC core on CPU Card
162 */
163 static const struct aperture axc001_memmap[16] = {
164 {AXC001_SLV_AXI_TUNNEL, 0x0},
165 {AXC001_SLV_AXI_TUNNEL, 0x1},
166 {AXC001_SLV_SRAM, 0x0}, /* 0x2000_0000: Local SRAM */
167 {AXC001_SLV_NONE, 0x0},
168 {AXC001_SLV_NONE, 0x0},
169 {AXC001_SLV_NONE, 0x0},
170 {AXC001_SLV_NONE, 0x0},
171 {AXC001_SLV_NONE, 0x0},
172 {AXC001_SLV_DDR_PORT0, 0x0}, /* 0x8000_0000: DDR 0..256M */
173 {AXC001_SLV_DDR_PORT0, 0x1}, /* 0x9000_0000: DDR 256..512M */
174 {AXC001_SLV_DDR_PORT0, 0x2},
175 {AXC001_SLV_DDR_PORT0, 0x3},
176 {AXC001_SLV_NONE, 0x0},
177 {AXC001_SLV_AXI_TUNNEL, 0xD},
178 {AXC001_SLV_AXI_TUNNEL, 0xE}, /* MB: CREG, CGU... */
179 {AXC001_SLV_AXI2APB, 0x0}, /* CPU Card local CREG, CGU... */
180 };
181
182 /*
183 * memmap for CPU Card AXI Tunnel Master (for access by MB controllers)
184 * GMAC (MB) -> MB AXI Tunnel slave -> CPU Card AXI Tunnel Master -> DDR
185 */
186 static const struct aperture axc001_axi_tunnel_memmap[16] = {
187 {AXC001_SLV_AXI_TUNNEL, 0x0},
188 {AXC001_SLV_AXI_TUNNEL, 0x1},
189 {AXC001_SLV_SRAM, 0x0},
190 {AXC001_SLV_NONE, 0x0},
191 {AXC001_SLV_NONE, 0x0},
192 {AXC001_SLV_NONE, 0x0},
193 {AXC001_SLV_NONE, 0x0},
194 {AXC001_SLV_NONE, 0x0},
195 {AXC001_SLV_DDR_PORT1, 0x0},
196 {AXC001_SLV_DDR_PORT1, 0x1},
197 {AXC001_SLV_DDR_PORT1, 0x2},
198 {AXC001_SLV_DDR_PORT1, 0x3},
199 {AXC001_SLV_NONE, 0x0},
200 {AXC001_SLV_AXI_TUNNEL, 0xD},
201 {AXC001_SLV_AXI_TUNNEL, 0xE},
202 {AXC001_SLV_AXI2APB, 0x0},
203 };
204
205 /*
206 * memmap for MB AXI Masters
207 * Same mem map for all perip controllers as well as MB AXI Tunnel Master
208 */
209 static const struct aperture axs_mb_memmap[16] = {
210 {AXS_MB_SLV_SRAM, 0x0},
211 {AXS_MB_SLV_SRAM, 0x0},
212 {AXS_MB_SLV_NONE, 0x0},
213 {AXS_MB_SLV_NONE, 0x0},
214 {AXS_MB_SLV_NONE, 0x0},
215 {AXS_MB_SLV_NONE, 0x0},
216 {AXS_MB_SLV_NONE, 0x0},
217 {AXS_MB_SLV_NONE, 0x0},
218 {AXS_MB_SLV_AXI_TUNNEL_CPU, 0x8}, /* DDR on CPU Card */
219 {AXS_MB_SLV_AXI_TUNNEL_CPU, 0x9}, /* DDR on CPU Card */
220 {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xA},
221 {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xB},
222 {AXS_MB_SLV_NONE, 0x0},
223 {AXS_MB_SLV_AXI_TUNNEL_HAPS, 0xD},
224 {AXS_MB_SLV_CONTROL, 0x0}, /* MB Local CREG, CGU... */
225 {AXS_MB_SLV_AXI_TUNNEL_CPU, 0xF},
226 };
227
228 static noinline void __init
axs101_set_memmap(void __iomem * base,const struct aperture map[16])229 axs101_set_memmap(void __iomem *base, const struct aperture map[16])
230 {
231 unsigned int slave_select, slave_offset;
232 int i;
233
234 slave_select = slave_offset = 0;
235 for (i = 0; i < 8; i++) {
236 slave_select |= map[i].slave_sel << (i << 2);
237 slave_offset |= map[i].slave_off << (i << 2);
238 }
239
240 iowrite32(slave_select, base + 0x0); /* SLV0 */
241 iowrite32(slave_offset, base + 0x8); /* OFFSET0 */
242
243 slave_select = slave_offset = 0;
244 for (i = 0; i < 8; i++) {
245 slave_select |= map[i+8].slave_sel << (i << 2);
246 slave_offset |= map[i+8].slave_off << (i << 2);
247 }
248
249 iowrite32(slave_select, base + 0x4); /* SLV1 */
250 iowrite32(slave_offset, base + 0xC); /* OFFSET1 */
251 }
252
axs101_early_init(void)253 static void __init axs101_early_init(void)
254 {
255 int i;
256
257 /* ARC 770D memory view */
258 axs101_set_memmap((void __iomem *) CREG_CPU_ADDR_770, axc001_memmap);
259 iowrite32(1, (void __iomem *) CREG_CPU_ADDR_770_UPD);
260
261 /* AXI tunnel memory map (incoming traffic from MB into CPU Card */
262 axs101_set_memmap((void __iomem *) CREG_CPU_ADDR_TUNN,
263 axc001_axi_tunnel_memmap);
264 iowrite32(1, (void __iomem *) CREG_CPU_ADDR_TUNN_UPD);
265
266 /* MB peripherals memory map */
267 for (i = AXS_MB_MST_TUNNEL_CPU; i <= AXS_MB_MST_USB_OHCI; i++)
268 axs101_set_memmap((void __iomem *) AXS_MB_CREG + (i << 4),
269 axs_mb_memmap);
270
271 iowrite32(0x3ff, (void __iomem *) AXS_MB_CREG + 0x100); /* Update */
272
273 /* GPIO pins 18 and 19 are used as UART rx and tx, respectively. */
274 iowrite32(0x01, (void __iomem *) CREG_CPU_GPIO_UART_MUX);
275
276 /* Set up the MB interrupt system: mux interrupts to GPIO7) */
277 iowrite32(0x01, (void __iomem *) CREG_MB_IRQ_MUX);
278
279 /* reset ethernet and ULPI interfaces */
280 iowrite32(0x18, (void __iomem *) CREG_MB_SW_RESET);
281
282 /* map GPIO 14:10 to ARC 9:5 (IRQ mux change for MB v2 onwards) */
283 iowrite32(0x52, (void __iomem *) CREG_CPU_ARC770_IRQ_MUX);
284
285 axs10x_early_init();
286 }
287
288 #endif /* CONFIG_AXS101 */
289
290 #ifdef CONFIG_AXS103
291
292 #define AXC003_CREG 0xF0001000
293 #define AXC003_MST_AXI_TUNNEL 0
294 #define AXC003_MST_HS38 1
295
296 #define CREG_CPU_AXI_M0_IRQ_MUX (AXC003_CREG + 0x440)
297 #define CREG_CPU_GPIO_UART_MUX (AXC003_CREG + 0x480)
298 #define CREG_CPU_TUN_IO_CTRL (AXC003_CREG + 0x494)
299
300
axs103_early_init(void)301 static void __init axs103_early_init(void)
302 {
303 #ifdef CONFIG_ARC_MCIP
304 /*
305 * AXS103 configurations for SMP/QUAD configurations share device tree
306 * which defaults to 100 MHz. However recent failures of Quad config
307 * revealed P&R timing violations so clamp it down to safe 50 MHz
308 * Instead of duplicating defconfig/DT for SMP/QUAD, add a small hack
309 * of fudging the freq in DT
310 */
311 #define AXS103_QUAD_CORE_CPU_FREQ_HZ 50000000
312
313 unsigned int num_cores = (read_aux_reg(ARC_REG_MCIP_BCR) >> 16) & 0x3F;
314 if (num_cores > 2) {
315 u32 freq;
316 int off = fdt_path_offset(initial_boot_params, "/cpu_card/core_clk");
317 const struct fdt_property *prop;
318
319 prop = fdt_get_property(initial_boot_params, off,
320 "assigned-clock-rates", NULL);
321 freq = be32_to_cpu(*(u32 *)(prop->data));
322
323 /* Patching .dtb in-place with new core clock value */
324 if (freq != AXS103_QUAD_CORE_CPU_FREQ_HZ) {
325 freq = cpu_to_be32(AXS103_QUAD_CORE_CPU_FREQ_HZ);
326 fdt_setprop_inplace(initial_boot_params, off,
327 "assigned-clock-rates", &freq, sizeof(freq));
328 }
329 }
330 #endif
331
332 /* Memory maps already config in pre-bootloader */
333
334 /* set GPIO mux to UART */
335 iowrite32(0x01, (void __iomem *) CREG_CPU_GPIO_UART_MUX);
336
337 iowrite32((0x00100000U | 0x000C0000U | 0x00003322U),
338 (void __iomem *) CREG_CPU_TUN_IO_CTRL);
339
340 /* Set up the AXS_MB interrupt system.*/
341 iowrite32(12, (void __iomem *) (CREG_CPU_AXI_M0_IRQ_MUX
342 + (AXC003_MST_HS38 << 2)));
343
344 /* connect ICTL - Main Board with GPIO line */
345 iowrite32(0x01, (void __iomem *) CREG_MB_IRQ_MUX);
346
347 axs10x_print_board_ver(AXC003_CREG + 4088, "AXC003 CPU Card");
348
349 axs10x_early_init();
350 }
351 #endif
352
353 #ifdef CONFIG_AXS101
354
355 static const char *axs101_compat[] __initconst = {
356 "snps,axs101",
357 NULL,
358 };
359
360 MACHINE_START(AXS101, "axs101")
361 .dt_compat = axs101_compat,
362 .init_early = axs101_early_init,
363 MACHINE_END
364
365 #endif /* CONFIG_AXS101 */
366
367 #ifdef CONFIG_AXS103
368
369 static const char *axs103_compat[] __initconst = {
370 "snps,axs103",
371 NULL,
372 };
373
374 MACHINE_START(AXS103, "axs103")
375 .dt_compat = axs103_compat,
376 .init_early = axs103_early_init,
377 MACHINE_END
378
379 /*
380 * For the VDK OS-kit, to get the offset to pid and command fields
381 */
382 char coware_swa_pid_offset[TASK_PID];
383 char coware_swa_comm_offset[TASK_COMM];
384
385 #endif /* CONFIG_AXS103 */
386