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