vexpress_platform.c revision 1.2 
1/* $NetBSD: vexpress_platform.c,v 1.2 2017/06/02 20:16:05 jmcneill 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_fdt_arm.h"
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: vexpress_platform.c,v 1.2 2017/06/02 20:16:05 jmcneill 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
43#include <uvm/uvm_extern.h>
44
45#include <machine/bootconfig.h>
46#include <arm/cpufunc.h>
47
48#include <arm/fdt/arm_fdtvar.h>
49
50#include <arm/cortex/gtmr_var.h>
51
52#include <arm/cortex/gic_reg.h>
53
54#include <evbarm/dev/plcomvar.h>
55
56#include <arm/vexpress/vexpress_platform.h>
57
58#define	VEXPRESS_REF_FREQ	24000000
59
60#define	DEVMAP_ALIGN(a)	((a) & ~L1_S_OFFSET)
61#define	DEVMAP_SIZE(s)	roundup2((s), L1_S_SIZE)
62#define	DEVMAP_ENTRY(va, pa, sz)			\
63	{						\
64		.pd_va = DEVMAP_ALIGN(va),		\
65		.pd_pa = DEVMAP_ALIGN(pa),		\
66		.pd_size = DEVMAP_SIZE(sz),		\
67		.pd_prot = VM_PROT_READ|VM_PROT_WRITE,	\
68		.pd_cache = PTE_NOCACHE			\
69	}
70#define	DEVMAP_ENTRY_END	{ 0 }
71
72extern struct bus_space armv7_generic_bs_tag;
73extern struct bus_space armv7_generic_a4x_bs_tag;
74extern struct arm32_bus_dma_tag armv7_generic_dma_tag;
75
76#define	SYSREG_BASE		0x1c010000
77#define	SYSREG_SIZE		0x1000
78
79#define	SYS_FLAGS		0x0030
80#define	SYS_FLAGSCLR		0x0034
81#define	SYS_CFGDATA		0x00a0
82#define	SYS_CFGCTRL		0x00a4
83#define	 SYS_CFGCTRL_START	__BIT(31)
84#define	 SYS_CFGCTRL_WRITE	__BIT(30)
85#define	 SYS_CFGCTRL_DCC	__BITS(29,26)
86#define	 SYS_CFGCTRL_FUNCTION	__BITS(25,20)
87#define	  SYS_CFGCTRL_FUNCTION_SHUTDOWN	8
88#define	  SYS_CFGCTRL_FUNCTION_REBOOT	9
89#define	 SYS_CFGCTRL_SITE	__BITS(17,16)
90#define	 SYS_CFGCTRL_POSITION	__BITS(15,12)
91#define	 SYS_CFGCTRL_DEVICE	__BITS(11,0)
92#define	SYS_CFGSTAT		0x00a8
93#define	 SYS_CFGSTAT_ERROR	__BIT(1)
94#define	 SYS_CFGSTAT_COMPLETE	__BIT(0)
95
96static bus_space_tag_t sysreg_bst = &armv7_generic_bs_tag;
97static bus_space_handle_t sysreg_bsh;
98
99#define	SYSREG_WRITE(o, v)	\
100	bus_space_write_4(sysreg_bst, sysreg_bsh, (o), (v))
101
102
103static void
104vexpress_a15_smp_init(void)
105{
106	extern void cortex_mpstart(void);
107	bus_space_tag_t gicd_bst = &armv7_generic_bs_tag;
108	bus_space_handle_t gicd_bsh;
109	int started = 0;
110
111	/* Bitmask of CPUs (non-BSP) to start */
112	for (int i = 1; i < arm_cpu_max; i++)
113		started |= __BIT(i);
114
115	/* Write init vec to SYS_FLAGS register */
116	SYSREG_WRITE(SYS_FLAGSCLR, 0xffffffff);
117	SYSREG_WRITE(SYS_FLAGS, (uint32_t)cortex_mpstart);
118
119	/* Map GIC distributor */
120	bus_space_map(gicd_bst, VEXPRESS_GIC_PBASE + GICD_BASE,
121	    0x1000, 0, &gicd_bsh);
122
123	/* Enable GIC distributor */
124	bus_space_write_4(gicd_bst, gicd_bsh,
125	    GICD_CTRL, GICD_CTRL_Enable);
126
127	/* Send sw interrupt to APs */
128	const uint32_t sgir = GICD_SGIR_TargetListFilter_NotMe;
129	bus_space_write_4(gicd_bst, gicd_bsh, GICD_SGIR, sgir);
130
131	/* Wait for APs to start */
132	for (u_int i = 0x10000000; i > 0; i--) {
133		arm_dmb();
134		if (arm_cpu_hatched == started)
135			break;
136	}
137
138	/* Disable GIC distributor */
139	bus_space_write_4(gicd_bst, gicd_bsh, GICD_CTRL, 0);
140}
141
142
143static const struct pmap_devmap *
144vexpress_platform_devmap(void)
145{
146	static const struct pmap_devmap devmap[] = {
147		DEVMAP_ENTRY(VEXPRESS_CORE_VBASE,
148			     VEXPRESS_CORE_PBASE,
149			     VEXPRESS_CORE_SIZE),
150		DEVMAP_ENTRY(VEXPRESS_GIC_VBASE,
151			     VEXPRESS_GIC_PBASE,
152			     VEXPRESS_GIC_SIZE),
153		DEVMAP_ENTRY_END
154	};
155
156	return devmap;
157}
158
159static void
160vexpress_platform_bootstrap(void)
161{
162	bus_space_map(sysreg_bst, SYSREG_BASE, SYSREG_SIZE, 0,
163	    &sysreg_bsh);
164
165	arm_cpu_max = 1 + __SHIFTOUT(armreg_l2ctrl_read(), L2CTRL_NUMCPU);
166
167	vexpress_a15_smp_init();
168}
169
170static void
171vexpress_platform_init_attach_args(struct fdt_attach_args *faa)
172{
173	faa->faa_bst = &armv7_generic_bs_tag;
174	faa->faa_a4x_bst = &armv7_generic_a4x_bs_tag;
175	faa->faa_dmat = &armv7_generic_dma_tag;
176}
177
178static void
179vexpress_platform_early_putchar(char c)
180{
181}
182
183static void
184vexpress_platform_device_register(device_t self, void *aux)
185{
186}
187
188static void
189vexpress_platform_reset(void)
190{
191	SYSREG_WRITE(SYS_CFGSTAT, 0);
192	SYSREG_WRITE(SYS_CFGDATA, 0);
193	SYSREG_WRITE(SYS_CFGCTRL,
194	    SYS_CFGCTRL_START |
195	    SYS_CFGCTRL_WRITE |
196	    __SHIFTIN(SYS_CFGCTRL_FUNCTION_REBOOT,
197		      SYS_CFGCTRL_FUNCTION));
198}
199
200static u_int
201vexpress_platform_uart_freq(void)
202{
203	return VEXPRESS_REF_FREQ;
204}
205
206static const struct arm_platform vexpress_platform = {
207	.devmap = vexpress_platform_devmap,
208	.bootstrap = vexpress_platform_bootstrap,
209	.init_attach_args = vexpress_platform_init_attach_args,
210	.early_putchar = vexpress_platform_early_putchar,
211	.device_register = vexpress_platform_device_register,
212	.reset = vexpress_platform_reset,
213	.delay = gtmr_delay,
214	.uart_freq = vexpress_platform_uart_freq,
215};
216
217ARM_PLATFORM(vexpress, "arm,vexpress", &vexpress_platform);
218