1 /*
2 * Copyright (C) 2009 Extreme Engineering Solutions, Inc.
3 *
4 * X-ES board-specific functionality
5 *
6 * Based on mpc85xx_ds code from Freescale Semiconductor, Inc.
7 *
8 * Author: Nate Case <ncase@xes-inc.com>
9 *
10 * This is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/kdev_t.h>
19 #include <linux/delay.h>
20 #include <linux/seq_file.h>
21 #include <linux/interrupt.h>
22 #include <linux/of_platform.h>
23
24 #include <asm/time.h>
25 #include <asm/machdep.h>
26 #include <asm/pci-bridge.h>
27 #include <mm/mmu_decl.h>
28 #include <asm/prom.h>
29 #include <asm/udbg.h>
30 #include <asm/mpic.h>
31
32 #include <sysdev/fsl_soc.h>
33 #include <sysdev/fsl_pci.h>
34 #include "smp.h"
35
36 #include "mpc85xx.h"
37
38 /* A few bit definitions needed for fixups on some boards */
39 #define MPC85xx_L2CTL_L2E 0x80000000 /* L2 enable */
40 #define MPC85xx_L2CTL_L2I 0x40000000 /* L2 flash invalidate */
41 #define MPC85xx_L2CTL_L2SIZ_MASK 0x30000000 /* L2 SRAM size (R/O) */
42
xes_mpc85xx_pic_init(void)43 void __init xes_mpc85xx_pic_init(void)
44 {
45 struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
46 0, 256, " OpenPIC ");
47 BUG_ON(mpic == NULL);
48 mpic_init(mpic);
49 }
50
xes_mpc85xx_configure_l2(void __iomem * l2_base)51 static void xes_mpc85xx_configure_l2(void __iomem *l2_base)
52 {
53 volatile uint32_t ctl, tmp;
54
55 asm volatile("msync; isync");
56 tmp = in_be32(l2_base);
57
58 /*
59 * xMon may have enabled part of L2 as SRAM, so we need to set it
60 * up for all cache mode just to be safe.
61 */
62 printk(KERN_INFO "xes_mpc85xx: Enabling L2 as cache\n");
63
64 ctl = MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2I;
65 if (of_machine_is_compatible("MPC8540") ||
66 of_machine_is_compatible("MPC8560"))
67 /*
68 * Assume L2 SRAM is used fully for cache, so set
69 * L2BLKSZ (bits 4:5) to match L2SIZ (bits 2:3).
70 */
71 ctl |= (tmp & MPC85xx_L2CTL_L2SIZ_MASK) >> 2;
72
73 asm volatile("msync; isync");
74 out_be32(l2_base, ctl);
75 asm volatile("msync; isync");
76 }
77
xes_mpc85xx_fixups(void)78 static void xes_mpc85xx_fixups(void)
79 {
80 struct device_node *np;
81 int err;
82
83 /*
84 * Legacy xMon firmware on some X-ES boards does not enable L2
85 * as cache. We must ensure that they get enabled here.
86 */
87 for_each_node_by_name(np, "l2-cache-controller") {
88 struct resource r[2];
89 void __iomem *l2_base;
90
91 /* Only MPC8548, MPC8540, and MPC8560 boards are affected */
92 if (!of_device_is_compatible(np,
93 "fsl,mpc8548-l2-cache-controller") &&
94 !of_device_is_compatible(np,
95 "fsl,mpc8540-l2-cache-controller") &&
96 !of_device_is_compatible(np,
97 "fsl,mpc8560-l2-cache-controller"))
98 continue;
99
100 err = of_address_to_resource(np, 0, &r[0]);
101 if (err) {
102 printk(KERN_WARNING "xes_mpc85xx: Could not get "
103 "resource for device tree node '%s'",
104 np->full_name);
105 continue;
106 }
107
108 l2_base = ioremap(r[0].start, resource_size(&r[0]));
109
110 xes_mpc85xx_configure_l2(l2_base);
111 }
112 }
113
114 /*
115 * Setup the architecture
116 */
xes_mpc85xx_setup_arch(void)117 static void __init xes_mpc85xx_setup_arch(void)
118 {
119 struct device_node *root;
120 const char *model = "Unknown";
121
122 root = of_find_node_by_path("/");
123 if (root == NULL)
124 return;
125
126 model = of_get_property(root, "model", NULL);
127
128 printk(KERN_INFO "X-ES MPC85xx-based single-board computer: %s\n",
129 model + strlen("xes,"));
130
131 xes_mpc85xx_fixups();
132
133 mpc85xx_smp_init();
134
135 fsl_pci_assign_primary();
136 }
137
138 machine_arch_initcall(xes_mpc8572, mpc85xx_common_publish_devices);
139 machine_arch_initcall(xes_mpc8548, mpc85xx_common_publish_devices);
140 machine_arch_initcall(xes_mpc8540, mpc85xx_common_publish_devices);
141
142 /*
143 * Called very early, device-tree isn't unflattened
144 */
xes_mpc8572_probe(void)145 static int __init xes_mpc8572_probe(void)
146 {
147 unsigned long root = of_get_flat_dt_root();
148
149 return of_flat_dt_is_compatible(root, "xes,MPC8572");
150 }
151
xes_mpc8548_probe(void)152 static int __init xes_mpc8548_probe(void)
153 {
154 unsigned long root = of_get_flat_dt_root();
155
156 return of_flat_dt_is_compatible(root, "xes,MPC8548");
157 }
158
xes_mpc8540_probe(void)159 static int __init xes_mpc8540_probe(void)
160 {
161 unsigned long root = of_get_flat_dt_root();
162
163 return of_flat_dt_is_compatible(root, "xes,MPC8540");
164 }
165
define_machine(xes_mpc8572)166 define_machine(xes_mpc8572) {
167 .name = "X-ES MPC8572",
168 .probe = xes_mpc8572_probe,
169 .setup_arch = xes_mpc85xx_setup_arch,
170 .init_IRQ = xes_mpc85xx_pic_init,
171 #ifdef CONFIG_PCI
172 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
173 .pcibios_fixup_phb = fsl_pcibios_fixup_phb,
174 #endif
175 .get_irq = mpic_get_irq,
176 .restart = fsl_rstcr_restart,
177 .calibrate_decr = generic_calibrate_decr,
178 .progress = udbg_progress,
179 };
180
define_machine(xes_mpc8548)181 define_machine(xes_mpc8548) {
182 .name = "X-ES MPC8548",
183 .probe = xes_mpc8548_probe,
184 .setup_arch = xes_mpc85xx_setup_arch,
185 .init_IRQ = xes_mpc85xx_pic_init,
186 #ifdef CONFIG_PCI
187 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
188 .pcibios_fixup_phb = fsl_pcibios_fixup_phb,
189 #endif
190 .get_irq = mpic_get_irq,
191 .restart = fsl_rstcr_restart,
192 .calibrate_decr = generic_calibrate_decr,
193 .progress = udbg_progress,
194 };
195
define_machine(xes_mpc8540)196 define_machine(xes_mpc8540) {
197 .name = "X-ES MPC8540",
198 .probe = xes_mpc8540_probe,
199 .setup_arch = xes_mpc85xx_setup_arch,
200 .init_IRQ = xes_mpc85xx_pic_init,
201 #ifdef CONFIG_PCI
202 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
203 .pcibios_fixup_phb = fsl_pcibios_fixup_phb,
204 #endif
205 .get_irq = mpic_get_irq,
206 .restart = fsl_rstcr_restart,
207 .calibrate_decr = generic_calibrate_decr,
208 .progress = udbg_progress,
209 };
210