vexpress_platform.c revision 1.24 
1/* $NetBSD: vexpress_platform.c,v 1.24 2025/09/06 21:02:41 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include "opt_multiprocessor.h"
30#include "opt_console.h"
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: vexpress_platform.c,v 1.24 2025/09/06 21:02:41 thorpej Exp $");
34
35#include <sys/param.h>
36#include <sys/bus.h>
37#include <sys/cpu.h>
38#include <sys/device.h>
39#include <sys/termios.h>
40
41#include <dev/fdt/fdtvar.h>
42#include <dev/fdt/fdt_platform.h>
43
44#include <uvm/uvm_extern.h>
45
46#include <machine/bootconfig.h>
47#include <arm/cpufunc.h>
48
49#include <arm/fdt/arm_fdtvar.h>
50
51#include <arm/cortex/gtmr_var.h>
52
53#include <arm/cortex/gic_reg.h>
54
55#include <evbarm/dev/plcomreg.h>
56#include <evbarm/fdt/machdep.h>
57
58#include <arm/vexpress/vexpress_platform.h>
59
60#include <libfdt.h>
61
62#define	VEXPRESS_REF_FREQ	24000000
63
64extern struct bus_space armv7_generic_bs_tag;
65extern struct arm32_bus_dma_tag arm_generic_dma_tag;
66
67#define	SYSREG_BASE		0x1c010000
68#define	SYSREG_SIZE		0x1000
69
70#define	SYS_FLAGS		0x0030
71#define	SYS_FLAGSCLR		0x0034
72#define	SYS_CFGDATA		0x00a0
73#define	SYS_CFGCTRL		0x00a4
74#define	 SYS_CFGCTRL_START	__BIT(31)
75#define	 SYS_CFGCTRL_WRITE	__BIT(30)
76#define	 SYS_CFGCTRL_DCC	__BITS(29,26)
77#define	 SYS_CFGCTRL_FUNCTION	__BITS(25,20)
78#define	  SYS_CFGCTRL_FUNCTION_SHUTDOWN	8
79#define	  SYS_CFGCTRL_FUNCTION_REBOOT	9
80#define	 SYS_CFGCTRL_SITE	__BITS(17,16)
81#define	 SYS_CFGCTRL_POSITION	__BITS(15,12)
82#define	 SYS_CFGCTRL_DEVICE	__BITS(11,0)
83#define	SYS_CFGSTAT		0x00a8
84#define	 SYS_CFGSTAT_ERROR	__BIT(1)
85#define	 SYS_CFGSTAT_COMPLETE	__BIT(0)
86
87static bus_space_tag_t sysreg_bst = &armv7_generic_bs_tag;
88static bus_space_handle_t sysreg_bsh;
89
90#define	SYSREG_WRITE(o, v)	\
91	bus_space_write_4(sysreg_bst, sysreg_bsh, (o), (v))
92
93void vexpress_platform_early_putchar(char);
94
95void __noasan
96vexpress_platform_early_putchar(char c)
97{
98#ifdef CONSADDR
99#define CONSADDR_VA ((CONSADDR - VEXPRESS_CORE_PBASE) + VEXPRESS_CORE_VBASE)
100	volatile uint32_t *uartaddr = cpu_earlydevice_va_p() ?
101	    (volatile uint32_t *)CONSADDR_VA :
102	    (volatile uint32_t *)CONSADDR;
103
104	while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFF) != 0)
105		continue;
106
107	uartaddr[PL01XCOM_DR / 4] = htole32(c);
108	dsb(sy);
109
110	while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFE) == 0)
111		continue;
112#endif
113}
114
115
116static int
117vexpress_a15_smp_init(void)
118{
119	int ret = 0;
120#ifdef MULTIPROCESSOR
121	bus_space_tag_t gicd_bst = &armv7_generic_bs_tag;
122	bus_space_handle_t gicd_bsh;
123
124	/* Write init vec to SYS_FLAGS register */
125	SYSREG_WRITE(SYS_FLAGSCLR, 0xffffffff);
126	SYSREG_WRITE(SYS_FLAGS, KERN_VTOPHYS((vaddr_t)cpu_mpstart));
127
128	/* Map GIC distributor */
129	bus_space_map(gicd_bst, VEXPRESS_GIC_PBASE + GICD_BASE,
130	    0x1000, 0, &gicd_bsh);
131
132	/* Enable GIC distributor */
133	bus_space_write_4(gicd_bst, gicd_bsh,
134	    GICD_CTRL, GICD_CTRL_Enable);
135
136	/* Send sw interrupt to APs */
137	const uint32_t sgir = GICD_SGIR_TargetListFilter_NotMe;
138	bus_space_write_4(gicd_bst, gicd_bsh, GICD_SGIR, sgir);
139
140	/* Bitmask of CPUs (non-BSP) to start */
141	for (u_int cpuindex = 1; cpuindex < arm_cpu_max; cpuindex++) {
142		u_int i;
143		for (i = 0x10000000; i > 0; i--) {
144			if (cpu_hatched_p(cpuindex))
145				break;
146		}
147
148		if (i == 0) {
149			ret++;
150			aprint_error("cpu%d: WARNING: AP failed to start\n",
151			    cpuindex);
152		}
153	}
154
155	/* Disable GIC distributor */
156	bus_space_write_4(gicd_bst, gicd_bsh, GICD_CTRL, 0);
157#endif
158	return ret;
159}
160
161
162static const struct pmap_devmap *
163vexpress_platform_devmap(void)
164{
165	static const struct pmap_devmap devmap[] = {
166		DEVMAP_ENTRY(VEXPRESS_CORE_VBASE,
167			     VEXPRESS_CORE_PBASE,
168			     VEXPRESS_CORE_SIZE),
169		DEVMAP_ENTRY(VEXPRESS_GIC_VBASE,
170			     VEXPRESS_GIC_PBASE,
171			     VEXPRESS_GIC_SIZE),
172		DEVMAP_ENTRY_END
173	};
174
175	return devmap;
176}
177
178static void
179vexpress_platform_bootstrap(void)
180{
181	bus_space_map(sysreg_bst, SYSREG_BASE, SYSREG_SIZE, 0,
182	    &sysreg_bsh);
183
184#ifdef MULTIPROCESSOR
185	arm_cpu_max = 1 + __SHIFTOUT(armreg_l2ctrl_read(), L2CTRL_NUMCPU);
186#endif
187}
188
189static void
190vexpress_platform_init_attach_args(struct fdt_attach_args *faa)
191{
192	faa->faa_bst = &armv7_generic_bs_tag;
193	faa->faa_dmat = &arm_generic_dma_tag;
194}
195
196static void
197vexpress_platform_device_register(device_t self, void *aux)
198{
199}
200
201static void
202vexpress_platform_reset(void)
203{
204	SYSREG_WRITE(SYS_CFGSTAT, 0);
205	SYSREG_WRITE(SYS_CFGDATA, 0);
206	SYSREG_WRITE(SYS_CFGCTRL,
207	    SYS_CFGCTRL_START |
208	    SYS_CFGCTRL_WRITE |
209	    __SHIFTIN(SYS_CFGCTRL_FUNCTION_REBOOT,
210		      SYS_CFGCTRL_FUNCTION));
211}
212
213static u_int
214vexpress_platform_uart_freq(void)
215{
216	return VEXPRESS_REF_FREQ;
217}
218
219static const struct fdt_platform vexpress_platform = {
220	.fp_devmap = vexpress_platform_devmap,
221	.fp_bootstrap = vexpress_platform_bootstrap,
222	.fp_mpstart = vexpress_a15_smp_init,
223	.fp_init_attach_args = vexpress_platform_init_attach_args,
224	.fp_device_register = vexpress_platform_device_register,
225	.fp_reset = vexpress_platform_reset,
226	.fp_delay = gtmr_delay,
227	.fp_uart_freq = vexpress_platform_uart_freq,
228};
229
230FDT_PLATFORM(vexpress, "arm,vexpress", &vexpress_platform);
231