1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net>
4 *
5 * arch/arm/mach-mvebu/kirkwood.c
6 *
7 * Flattened Device Tree board initialization
8 */
9
10#include <linux/clk.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/mbus.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16#include <linux/of_net.h>
17#include <linux/of_platform.h>
18#include <linux/platform_device.h>
19#include <linux/slab.h>
20#include <asm/hardware/cache-feroceon-l2.h>
21#include <asm/mach/arch.h>
22#include <asm/mach/map.h>
23#include "kirkwood.h"
24#include "kirkwood-pm.h"
25#include "common.h"
26
27static struct resource kirkwood_cpufreq_resources[] = {
28 [0] = {
29 .start = CPU_CONTROL_PHYS,
30 .end = CPU_CONTROL_PHYS + 3,
31 .flags = IORESOURCE_MEM,
32 },
33};
34
35static struct platform_device kirkwood_cpufreq_device = {
36 .name = "kirkwood-cpufreq",
37 .id = -1,
38 .num_resources = ARRAY_SIZE(kirkwood_cpufreq_resources),
39 .resource = kirkwood_cpufreq_resources,
40};
41
42static void __init kirkwood_cpufreq_init(void)
43{
44 platform_device_register(&kirkwood_cpufreq_device);
45}
46
47static struct resource kirkwood_cpuidle_resource[] = {
48 {
49 .flags = IORESOURCE_MEM,
50 .start = DDR_OPERATION_BASE,
51 .end = DDR_OPERATION_BASE + 3,
52 },
53};
54
55static struct platform_device kirkwood_cpuidle = {
56 .name = "kirkwood_cpuidle",
57 .id = -1,
58 .resource = kirkwood_cpuidle_resource,
59 .num_resources = 1,
60};
61
62static void __init kirkwood_cpuidle_init(void)
63{
64 platform_device_register(&kirkwood_cpuidle);
65}
66
67#define MV643XX_ETH_MAC_ADDR_LOW 0x0414
68#define MV643XX_ETH_MAC_ADDR_HIGH 0x0418
69
70static void __init kirkwood_dt_eth_fixup(void)
71{
72 struct device_node *np;
73
74 /*
75 * The ethernet interfaces forget the MAC address assigned by u-boot
76 * if the clocks are turned off. Usually, u-boot on kirkwood boards
77 * has no DT support to properly set local-mac-address property.
78 * As a workaround, we get the MAC address from mv643xx_eth registers
79 * and update the port device node if no valid MAC address is set.
80 */
81 for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
82 struct device_node *pnp = of_get_parent(node: np);
83 struct clk *clk;
84 struct property *pmac;
85 u8 tmpmac[ETH_ALEN];
86 void __iomem *io;
87 u8 *macaddr;
88 u32 reg;
89
90 if (!pnp)
91 continue;
92
93 /* skip disabled nodes or nodes with valid MAC address*/
94 if (!of_device_is_available(device: pnp) ||
95 !of_get_mac_address(np, mac: tmpmac))
96 goto eth_fixup_skip;
97
98 clk = of_clk_get(np: pnp, index: 0);
99 if (IS_ERR(ptr: clk))
100 goto eth_fixup_skip;
101
102 io = of_iomap(node: pnp, index: 0);
103 if (!io)
104 goto eth_fixup_no_map;
105
106 /* ensure port clock is not gated to not hang CPU */
107 clk_prepare_enable(clk);
108
109 /* store MAC address register contents in local-mac-address */
110 pmac = kzalloc(size: sizeof(*pmac) + 6, GFP_KERNEL);
111 if (!pmac)
112 goto eth_fixup_no_mem;
113
114 pmac->value = pmac + 1;
115 pmac->length = 6;
116 pmac->name = kstrdup(s: "local-mac-address", GFP_KERNEL);
117 if (!pmac->name) {
118 kfree(objp: pmac);
119 goto eth_fixup_no_mem;
120 }
121
122 macaddr = pmac->value;
123 reg = readl(addr: io + MV643XX_ETH_MAC_ADDR_HIGH);
124 macaddr[0] = (reg >> 24) & 0xff;
125 macaddr[1] = (reg >> 16) & 0xff;
126 macaddr[2] = (reg >> 8) & 0xff;
127 macaddr[3] = reg & 0xff;
128
129 reg = readl(addr: io + MV643XX_ETH_MAC_ADDR_LOW);
130 macaddr[4] = (reg >> 8) & 0xff;
131 macaddr[5] = reg & 0xff;
132
133 of_update_property(np, newprop: pmac);
134
135eth_fixup_no_mem:
136 iounmap(addr: io);
137 clk_disable_unprepare(clk);
138eth_fixup_no_map:
139 clk_put(clk);
140eth_fixup_skip:
141 of_node_put(node: pnp);
142 }
143}
144
145/*
146 * Disable propagation of mbus errors to the CPU local bus, as this
147 * causes mbus errors (which can occur for example for PCI aborts) to
148 * throw CPU aborts, which we're not set up to deal with.
149 */
150static void kirkwood_disable_mbus_error_propagation(void)
151{
152 void __iomem *cpu_config;
153
154 cpu_config = ioremap(CPU_CONFIG_PHYS, size: 4);
155 writel(readl(addr: cpu_config) & ~CPU_CONFIG_ERROR_PROP, addr: cpu_config);
156}
157
158static struct of_dev_auxdata auxdata[] __initdata = {
159 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000,
160 "mvebu-audio", NULL),
161 { /* sentinel */ }
162};
163
164static void __init kirkwood_dt_init(void)
165{
166 kirkwood_disable_mbus_error_propagation();
167
168 BUG_ON(mvebu_mbus_dt_init(false));
169
170#ifdef CONFIG_CACHE_FEROCEON_L2
171 feroceon_of_init();
172#endif
173 kirkwood_cpufreq_init();
174 kirkwood_cpuidle_init();
175
176 kirkwood_pm_init();
177 kirkwood_dt_eth_fixup();
178
179 of_platform_default_populate(NULL, lookup: auxdata, NULL);
180}
181
182static const char * const kirkwood_dt_board_compat[] __initconst = {
183 "marvell,kirkwood",
184 NULL
185};
186
187DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
188 /* Maintainer: Jason Cooper <jason@lakedaemon.net> */
189 .init_machine = kirkwood_dt_init,
190 .restart = mvebu_restart,
191 .dt_compat = kirkwood_dt_board_compat,
192MACHINE_END
193

source code of linux/arch/arm/mach-mvebu/kirkwood.c