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
29static struct resource kirkwood_cpufreq_resources[] = {
30	[0] = {
31		.start  = CPU_CONTROL_PHYS,
32		.end    = CPU_CONTROL_PHYS + 3,
33		.flags  = IORESOURCE_MEM,
34	},
35};
36
37static struct platform_device kirkwood_cpufreq_device = {
38	.name		= "kirkwood-cpufreq",
39	.id		= -1,
40	.num_resources	= ARRAY_SIZE(kirkwood_cpufreq_resources),
41	.resource	= kirkwood_cpufreq_resources,
42};
43
44static void __init kirkwood_cpufreq_init(void)
45{
46	platform_device_register(&kirkwood_cpufreq_device);
47}
48
49static struct resource kirkwood_cpuidle_resource[] = {
50	{
51		.flags	= IORESOURCE_MEM,
52		.start	= DDR_OPERATION_BASE,
53		.end	= DDR_OPERATION_BASE + 3,
54	},
55};
56
57static struct platform_device kirkwood_cpuidle = {
58	.name		= "kirkwood_cpuidle",
59	.id		= -1,
60	.resource	= kirkwood_cpuidle_resource,
61	.num_resources	= 1,
62};
63
64static void __init kirkwood_cpuidle_init(void)
65{
66	platform_device_register(&kirkwood_cpuidle);
67}
68
69#define MV643XX_ETH_MAC_ADDR_LOW	0x0414
70#define MV643XX_ETH_MAC_ADDR_HIGH	0x0418
71
72static void __init kirkwood_dt_eth_fixup(void)
73{
74	struct device_node *np;
75
76	/*
77	 * The ethernet interfaces forget the MAC address assigned by u-boot
78	 * if the clocks are turned off. Usually, u-boot on kirkwood boards
79	 * has no DT support to properly set local-mac-address property.
80	 * As a workaround, we get the MAC address from mv643xx_eth registers
81	 * and update the port device node if no valid MAC address is set.
82	 */
83	for_each_compatible_node(np, NULL, "marvell,kirkwood-eth-port") {
84		struct device_node *pnp = of_get_parent(np);
85		struct clk *clk;
86		struct property *pmac;
87		void __iomem *io;
88		u8 *macaddr;
89		u32 reg;
90
91		if (!pnp)
92			continue;
93
94		/* skip disabled nodes or nodes with valid MAC address*/
95		if (!of_device_is_available(pnp) ||
96		    !IS_ERR(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		pmac = kzalloc(sizeof(*pmac) + 6, GFP_KERNEL);
112		if (!pmac)
113			goto eth_fixup_no_mem;
114
115		pmac->value = pmac + 1;
116		pmac->length = 6;
117		pmac->name = kstrdup("local-mac-address", GFP_KERNEL);
118		if (!pmac->name) {
119			kfree(pmac);
120			goto eth_fixup_no_mem;
121		}
122
123		macaddr = pmac->value;
124		reg = readl(io + MV643XX_ETH_MAC_ADDR_HIGH);
125		macaddr[0] = (reg >> 24) & 0xff;
126		macaddr[1] = (reg >> 16) & 0xff;
127		macaddr[2] = (reg >> 8) & 0xff;
128		macaddr[3] = reg & 0xff;
129
130		reg = readl(io + MV643XX_ETH_MAC_ADDR_LOW);
131		macaddr[4] = (reg >> 8) & 0xff;
132		macaddr[5] = reg & 0xff;
133
134		of_update_property(np, pmac);
135
136eth_fixup_no_mem:
137		iounmap(io);
138		clk_disable_unprepare(clk);
139eth_fixup_no_map:
140		clk_put(clk);
141eth_fixup_skip:
142		of_node_put(pnp);
143	}
144}
145
146/*
147 * Disable propagation of mbus errors to the CPU local bus, as this
148 * causes mbus errors (which can occur for example for PCI aborts) to
149 * throw CPU aborts, which we're not set up to deal with.
150 */
151static void kirkwood_disable_mbus_error_propagation(void)
152{
153	void __iomem *cpu_config;
154
155	cpu_config = ioremap(CPU_CONFIG_PHYS, 4);
156	writel(readl(cpu_config) & ~CPU_CONFIG_ERROR_PROP, cpu_config);
157}
158
159static struct of_dev_auxdata auxdata[] __initdata = {
160	OF_DEV_AUXDATA("marvell,kirkwood-audio", 0xf10a0000,
161		       "mvebu-audio", NULL),
162	{ /* sentinel */ }
163};
164
165static void __init kirkwood_dt_init(void)
166{
167	kirkwood_disable_mbus_error_propagation();
168
169	BUG_ON(mvebu_mbus_dt_init(false));
170
171#ifdef CONFIG_CACHE_FEROCEON_L2
172	feroceon_of_init();
173#endif
174	kirkwood_cpufreq_init();
175	kirkwood_cpuidle_init();
176
177	kirkwood_pm_init();
178	kirkwood_dt_eth_fixup();
179
180	of_platform_default_populate(NULL, auxdata, NULL);
181}
182
183static const char * const kirkwood_dt_board_compat[] __initconst = {
184	"marvell,kirkwood",
185	NULL
186};
187
188DT_MACHINE_START(KIRKWOOD_DT, "Marvell Kirkwood (Flattened Device Tree)")
189	/* Maintainer: Jason Cooper <jason@lakedaemon.net> */
190	.init_machine	= kirkwood_dt_init,
191	.restart	= mvebu_restart,
192	.dt_compat	= kirkwood_dt_board_compat,
193MACHINE_END
194