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(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 | |
135 | eth_fixup_no_mem: |
136 | iounmap(addr: io); |
137 | clk_disable_unprepare(clk); |
138 | eth_fixup_no_map: |
139 | clk_put(clk); |
140 | eth_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 | */ |
150 | static 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 | |
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, lookup: 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 | |