xref: /openbmc/linux/arch/arm/mach-mvebu/kirkwood.c (revision 6774def6)
1 /*
2  * Copyright 2012 (C), Jason Cooper <jason@lakedaemon.net>
3  *
4  * arch/arm/mach-mvebu/kirkwood.c
5  *
6  * Flattened Device Tree board initialization
7  *
8  * This file is licensed under the terms of the GNU General Public
9  * License version 2.  This program is licensed "as is" without any
10  * warranty of any kind, whether express or implied.
11  */
12 
13 #include <linux/clk.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/mbus.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/of_net.h>
20 #include <linux/of_platform.h>
21 #include <linux/slab.h>
22 #include <asm/hardware/cache-feroceon-l2.h>
23 #include <asm/mach/arch.h>
24 #include <asm/mach/map.h>
25 #include "kirkwood.h"
26 #include "kirkwood-pm.h"
27 #include "common.h"
28 #include "board.h"
29 
30 static struct resource kirkwood_cpufreq_resources[] = {
31 	[0] = {
32 		.start  = CPU_CONTROL_PHYS,
33 		.end    = CPU_CONTROL_PHYS + 3,
34 		.flags  = IORESOURCE_MEM,
35 	},
36 };
37 
38 static struct platform_device kirkwood_cpufreq_device = {
39 	.name		= "kirkwood-cpufreq",
40 	.id		= -1,
41 	.num_resources	= ARRAY_SIZE(kirkwood_cpufreq_resources),
42 	.resource	= kirkwood_cpufreq_resources,
43 };
44 
45 static void __init kirkwood_cpufreq_init(void)
46 {
47 	platform_device_register(&kirkwood_cpufreq_device);
48 }
49 
50 static struct resource kirkwood_cpuidle_resource[] = {
51 	{
52 		.flags	= IORESOURCE_MEM,
53 		.start	= DDR_OPERATION_BASE,
54 		.end	= DDR_OPERATION_BASE + 3,
55 	},
56 };
57 
58 static struct platform_device kirkwood_cpuidle = {
59 	.name		= "kirkwood_cpuidle",
60 	.id		= -1,
61 	.resource	= kirkwood_cpuidle_resource,
62 	.num_resources	= 1,
63 };
64 
65 static void __init kirkwood_cpuidle_init(void)
66 {
67 	platform_device_register(&kirkwood_cpuidle);
68 }
69 
70 #define MV643XX_ETH_MAC_ADDR_LOW	0x0414
71 #define MV643XX_ETH_MAC_ADDR_HIGH	0x0418
72 
73 static void __init kirkwood_dt_eth_fixup(void)
74 {
75 	struct device_node *np;
76 
77 	/*
78 	 * The ethernet interfaces forget the MAC address assigned by u-boot
79 	 * if the clocks are turned off. Usually, u-boot on kirkwood boards
80 	 * has no DT support to properly set local-mac-address property.
81 	 * As a workaround, we get the MAC address from mv643xx_eth registers
82 	 * and update the port device node if no valid MAC address is set.
83 	 */
84 	for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
85 		struct device_node *pnp = of_get_parent(np);
86 		struct clk *clk;
87 		struct property *pmac;
88 		void __iomem *io;
89 		u8 *macaddr;
90 		u32 reg;
91 
92 		if (!pnp)
93 			continue;
94 
95 		/* skip disabled nodes or nodes with valid MAC address*/
96 		if (!of_device_is_available(pnp) || of_get_mac_address(np))
97 			goto eth_fixup_skip;
98 
99 		clk = of_clk_get(pnp, 0);
100 		if (IS_ERR(clk))
101 			goto eth_fixup_skip;
102 
103 		io = of_iomap(pnp, 0);
104 		if (!io)
105 			goto eth_fixup_no_map;
106 
107 		/* ensure port clock is not gated to not hang CPU */
108 		clk_prepare_enable(clk);
109 
110 		/* store MAC address register contents in local-mac-address */
111 		pr_err(FW_INFO "%s: local-mac-address is not set\n",
112 		       np->full_name);
113 
114 		pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
115 		if (!pmac)
116 			goto eth_fixup_no_mem;
117 
118 		pmac->value = pmac + 1;
119 		pmac->length = 6;
120 		pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
121 		if (!pmac->name) {
122 			kfree(pmac);
123 			goto eth_fixup_no_mem;
124 		}
125 
126 		macaddr = pmac->value;
127 		reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
128 		macaddr[0] = (reg >> 24) & 0xff;
129 		macaddr[1] = (reg >> 16) & 0xff;
130 		macaddr[2] = (reg >> 8) & 0xff;
131 		macaddr[3] = reg & 0xff;
132 
133 		reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
134 		macaddr[4] = (reg >> 8) & 0xff;
135 		macaddr[5] = reg & 0xff;
136 
137 		of_update_property(np, pmac);
138 
139 eth_fixup_no_mem:
140 		iounmap(io);
141 		clk_disable_unprepare(clk);
142 eth_fixup_no_map:
143 		clk_put(clk);
144 eth_fixup_skip:
145 		of_node_put(pnp);
146 	}
147 }
148 
149 /*
150  * Disable propagation of mbus errors to the CPU local bus, as this
151  * causes mbus errors (which can occur for example for PCI aborts) to
152  * throw CPU aborts, which we're not set up to deal with.
153  */
154 void kirkwood_disable_mbus_error_propagation(void)
155 {
156 	void __iomem *cpu_config;
157 
158 	cpu_config = ioremap(CPU_CONFIG_PHYS, 4);
159 	writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config);
160 }
161 
162 static struct of_dev_auxdata auxdata[] __initdata = {
163 	OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000,
164 		       "mvebu-audio", NULL),
165 	{ /* sentinel */ }
166 };
167 
168 static void __init kirkwood_dt_init(void)
169 {
170 	kirkwood_disable_mbus_error_propagation();
171 
172 	BUG_ON(mvebu_mbus_dt_init(false));
173 
174 #ifdef CONFIG_CACHE_FEROCEON_L2
175 	feroceon_of_init();
176 #endif
177 	kirkwood_cpufreq_init();
178 	kirkwood_cpuidle_init();
179 
180 	kirkwood_pm_init();
181 	kirkwood_dt_eth_fixup();
182 
183 	if (of_machine_is_compatible("lacie,netxbig"))
184 		netxbig_init();
185 
186 	of_platform_populate(NULL, of_default_bus_match_table, auxdata, NULL);
187 }
188 
189 static const char * const kirkwood_dt_board_compat[] = {
190 	"marvell,kirkwood",
191 	NULL
192 };
193 
194 DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
195 	/* Maintainer: Jason Cooper <jason@lakedaemon.net> */
196 	.init_machine	= kirkwood_dt_init,
197 	.restart	= mvebu_restart,
198 	.dt_compat	= kirkwood_dt_board_compat,
199 MACHINE_END
200