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
27 static 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
35 static 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
42 static void __init kirkwood_cpufreq_init(void)
43 {
44 platform_device_register(&kirkwood_cpufreq_device);
45 }
46
47 static struct resource kirkwood_cpuidle_resource[] = {
48 {
49 .flags = IORESOURCE_MEM,
50 .start = DDR_OPERATION_BASE,
51 .end = DDR_OPERATION_BASE + 3,
52 },
53 };
54
55 static struct platform_device kirkwood_cpuidle = {
56 .name = "kirkwood_cpuidle",
57 .id = -1,
58 .resource = kirkwood_cpuidle_resource,
59 .num_resources = 1,
60 };
61
62 static 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
70 static 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(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(pnp) ||
95 !of_get_mac_address(np, tmpmac))
96 goto eth_fixup_skip;
97
98 clk = of_clk_get(pnp, 0);
99 if (IS_ERR(clk))
100 goto eth_fixup_skip;
101
102 io = of_iomap(pnp, 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(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("local-mac-address", GFP_KERNEL);
117 if (!pmac->name) {
118 kfree(pmac);
119 goto eth_fixup_no_mem;
120 }
121
122 macaddr = pmac->value;
123 reg = readl(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(io + MV643XX_ETH_MAC_ADDR_LOW);
130 macaddr[4] = (reg >> 8) & 0xff;
131 macaddr[5] = reg & 0xff;
132
133 of_update_property(np, pmac);
134
135 eth_fixup_no_mem:
136 iounmap(io);
137 clk_disable_unprepare(clk);
138 eth_fixup_no_map:
139 clk_put(clk);
140 eth_fixup_skip:
141 of_node_put(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 */
150 static void kirkwood_disable_mbus_error_propagation(void)
151 {
152 void __iomem *cpu_config;
153
154 cpu_config = ioremap(CPU_CONFIG_PHYS, 4);
155 writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config);
156 }
157
158 static struct of_dev_auxdata auxdata[] __initdata = {
159 OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000,
160 "mvebu-audio", NULL),
161 { /* sentinel */ }
162 };
163
164 static 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, auxdata, NULL);
180 }
181
182 static const char * const kirkwood_dt_board_compat[] __initconst = {
183 "marvell,kirkwood",
184 NULL
185 };
186
187 DT_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,
192 MACHINE_END
193
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