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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 1999 ARM Limited
4 * Copyright (C) 2000 Deep Blue Solutions Ltd
5 * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
6 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
7 * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
8 */
9
10#include <linux/kernel.h>
11#include <linux/clk.h>
12#include <linux/io.h>
13#include <linux/err.h>
14#include <linux/delay.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17
18#include <asm/system_misc.h>
19#include <asm/proc-fns.h>
20#include <asm/mach-types.h>
21#include <asm/hardware/cache-l2x0.h>
22
23#include "common.h"
24#include "hardware.h"
25
26static void __iomem *wdog_base;
27static struct clk *wdog_clk;
28static int wcr_enable = (1 << 2);
29
30/*
31 * Reset the system. It is called by machine_restart().
32 */
33void mxc_restart(enum reboot_mode mode, const char *cmd)
34{
35 if (!wdog_base)
36 goto reset_fallback;
37
38 if (!IS_ERR(wdog_clk))
39 clk_enable(wdog_clk);
40
41 /* Assert SRS signal */
42 imx_writew(wcr_enable, wdog_base);
43 /*
44 * Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
45 * written twice), we add another two writes to ensure there must be at
46 * least two writes happen in the same one 32kHz clock period. We save
47 * the target check here, since the writes shouldn't be a huge burden
48 * for other platforms.
49 */
50 imx_writew(wcr_enable, wdog_base);
51 imx_writew(wcr_enable, wdog_base);
52
53 /* wait for reset to assert... */
54 mdelay(500);
55
56 pr_err("%s: Watchdog reset failed to assert reset\n", __func__);
57
58 /* delay to allow the serial port to show the message */
59 mdelay(50);
60
61reset_fallback:
62 /* we'll take a jump through zero as a poor second */
63 soft_restart(0);
64}
65
66void __init mxc_arch_reset_init(void __iomem *base)
67{
68 wdog_base = base;
69
70 wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
71 if (IS_ERR(wdog_clk))
72 pr_warn("%s: failed to get wdog clock\n", __func__);
73 else
74 clk_prepare(wdog_clk);
75}
76
77#ifdef CONFIG_SOC_IMX1
78void __init imx1_reset_init(void __iomem *base)
79{
80 wcr_enable = (1 << 0);
81 mxc_arch_reset_init(base);
82}
83#endif
84
85#ifdef CONFIG_CACHE_L2X0
86void __init imx_init_l2cache(void)
87{
88 void __iomem *l2x0_base;
89 struct device_node *np;
90 unsigned int val;
91
92 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
93 if (!np)
94 return;
95
96 l2x0_base = of_iomap(np, 0);
97 if (!l2x0_base)
98 goto put_node;
99
100 if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN)) {
101 /* Configure the L2 PREFETCH and POWER registers */
102 val = readl_relaxed(l2x0_base + L310_PREFETCH_CTRL);
103 val |= L310_PREFETCH_CTRL_DBL_LINEFILL |
104 L310_PREFETCH_CTRL_INSTR_PREFETCH |
105 L310_PREFETCH_CTRL_DATA_PREFETCH;
106
107 /* Set perfetch offset to improve performance */
108 val &= ~L310_PREFETCH_CTRL_OFFSET_MASK;
109 val |= 15;
110
111 writel_relaxed(val, l2x0_base + L310_PREFETCH_CTRL);
112 }
113
114 iounmap(l2x0_base);
115put_node:
116 of_node_put(np);
117}
118#endif
1/*
2 * Copyright (C) 1999 ARM Limited
3 * Copyright (C) 2000 Deep Blue Solutions Ltd
4 * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
5 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
6 * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/kernel.h>
20#include <linux/clk.h>
21#include <linux/io.h>
22#include <linux/err.h>
23#include <linux/delay.h>
24#include <linux/of.h>
25#include <linux/of_address.h>
26
27#include <asm/system_misc.h>
28#include <asm/proc-fns.h>
29#include <asm/mach-types.h>
30#include <asm/hardware/cache-l2x0.h>
31
32#include "common.h"
33#include "hardware.h"
34
35static void __iomem *wdog_base;
36static struct clk *wdog_clk;
37
38/*
39 * Reset the system. It is called by machine_restart().
40 */
41void mxc_restart(enum reboot_mode mode, const char *cmd)
42{
43 unsigned int wcr_enable;
44
45 if (wdog_clk)
46 clk_enable(wdog_clk);
47
48 if (cpu_is_mx1())
49 wcr_enable = (1 << 0);
50 else
51 wcr_enable = (1 << 2);
52
53 /* Assert SRS signal */
54 __raw_writew(wcr_enable, wdog_base);
55 /*
56 * Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
57 * written twice), we add another two writes to ensure there must be at
58 * least two writes happen in the same one 32kHz clock period. We save
59 * the target check here, since the writes shouldn't be a huge burden
60 * for other platforms.
61 */
62 __raw_writew(wcr_enable, wdog_base);
63 __raw_writew(wcr_enable, wdog_base);
64
65 /* wait for reset to assert... */
66 mdelay(500);
67
68 pr_err("%s: Watchdog reset failed to assert reset\n", __func__);
69
70 /* delay to allow the serial port to show the message */
71 mdelay(50);
72
73 /* we'll take a jump through zero as a poor second */
74 soft_restart(0);
75}
76
77void __init mxc_arch_reset_init(void __iomem *base)
78{
79 wdog_base = base;
80
81 wdog_clk = clk_get_sys("imx2-wdt.0", NULL);
82 if (IS_ERR(wdog_clk)) {
83 pr_warn("%s: failed to get wdog clock\n", __func__);
84 wdog_clk = NULL;
85 return;
86 }
87
88 clk_prepare(wdog_clk);
89}
90
91void __init mxc_arch_reset_init_dt(void)
92{
93 struct device_node *np;
94
95 np = of_find_compatible_node(NULL, NULL, "fsl,imx21-wdt");
96 wdog_base = of_iomap(np, 0);
97 WARN_ON(!wdog_base);
98
99 wdog_clk = of_clk_get(np, 0);
100 if (IS_ERR(wdog_clk)) {
101 pr_warn("%s: failed to get wdog clock\n", __func__);
102 wdog_clk = NULL;
103 return;
104 }
105
106 clk_prepare(wdog_clk);
107}
108
109#ifdef CONFIG_CACHE_L2X0
110void __init imx_init_l2cache(void)
111{
112 void __iomem *l2x0_base;
113 struct device_node *np;
114 unsigned int val;
115
116 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
117 if (!np)
118 goto out;
119
120 l2x0_base = of_iomap(np, 0);
121 if (!l2x0_base) {
122 of_node_put(np);
123 goto out;
124 }
125
126 /* Configure the L2 PREFETCH and POWER registers */
127 val = readl_relaxed(l2x0_base + L2X0_PREFETCH_CTRL);
128 val |= 0x70800000;
129 /*
130 * The L2 cache controller(PL310) version on the i.MX6D/Q is r3p1-50rel0
131 * The L2 cache controller(PL310) version on the i.MX6DL/SOLO/SL is r3p2
132 * But according to ARM PL310 errata: 752271
133 * ID: 752271: Double linefill feature can cause data corruption
134 * Fault Status: Present in: r3p0, r3p1, r3p1-50rel0. Fixed in r3p2
135 * Workaround: The only workaround to this erratum is to disable the
136 * double linefill feature. This is the default behavior.
137 */
138 if (cpu_is_imx6q())
139 val &= ~(1 << 30 | 1 << 23);
140 writel_relaxed(val, l2x0_base + L2X0_PREFETCH_CTRL);
141 val = L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN;
142 writel_relaxed(val, l2x0_base + L2X0_POWER_CTRL);
143
144 iounmap(l2x0_base);
145 of_node_put(np);
146
147out:
148 l2x0_of_init(0, ~0UL);
149}
150#endif