1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2009 Extreme Engineering Solutions, Inc.
4  *
5  * X-ES board-specific functionality
6  *
7  * Based on mpc85xx_ds code from Freescale Semiconductor, Inc.
8  *
9  * Author: Nate Case <ncase@xes-inc.com>
10  */
11 
12 #include <linux/stddef.h>
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/kdev_t.h>
16 #include <linux/delay.h>
17 #include <linux/seq_file.h>
18 #include <linux/interrupt.h>
19 #include <linux/of_address.h>
20 #include <linux/of_platform.h>
21 
22 #include <asm/time.h>
23 #include <asm/machdep.h>
24 #include <asm/pci-bridge.h>
25 #include <mm/mmu_decl.h>
26 #include <asm/udbg.h>
27 #include <asm/mpic.h>
28 
29 #include <sysdev/fsl_soc.h>
30 #include <sysdev/fsl_pci.h>
31 #include "smp.h"
32 
33 #include "mpc85xx.h"
34 
35 /* A few bit definitions needed for fixups on some boards */
36 #define MPC85xx_L2CTL_L2E		0x80000000 /* L2 enable */
37 #define MPC85xx_L2CTL_L2I		0x40000000 /* L2 flash invalidate */
38 #define MPC85xx_L2CTL_L2SIZ_MASK	0x30000000 /* L2 SRAM size (R/O) */
39 
xes_mpc85xx_pic_init(void)40 void __init xes_mpc85xx_pic_init(void)
41 {
42 	struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
43 			0, 256, " OpenPIC  ");
44 	BUG_ON(mpic == NULL);
45 	mpic_init(mpic);
46 }
47 
xes_mpc85xx_configure_l2(void __iomem * l2_base)48 static void __init xes_mpc85xx_configure_l2(void __iomem *l2_base)
49 {
50 	volatile uint32_t ctl, tmp;
51 
52 	asm volatile("msync; isync");
53 	tmp = in_be32(l2_base);
54 
55 	/*
56 	 * xMon may have enabled part of L2 as SRAM, so we need to set it
57 	 * up for all cache mode just to be safe.
58 	 */
59 	printk(KERN_INFO "xes_mpc85xx: Enabling L2 as cache\n");
60 
61 	ctl = MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2I;
62 	if (of_machine_is_compatible("MPC8540") ||
63 	    of_machine_is_compatible("MPC8560"))
64 		/*
65 		 * Assume L2 SRAM is used fully for cache, so set
66 		 * L2BLKSZ (bits 4:5) to match L2SIZ (bits 2:3).
67 		 */
68 		ctl |= (tmp & MPC85xx_L2CTL_L2SIZ_MASK) >> 2;
69 
70 	asm volatile("msync; isync");
71 	out_be32(l2_base, ctl);
72 	asm volatile("msync; isync");
73 }
74 
xes_mpc85xx_fixups(void)75 static void __init xes_mpc85xx_fixups(void)
76 {
77 	struct device_node *np;
78 	int err;
79 
80 	/*
81 	 * Legacy xMon firmware on some X-ES boards does not enable L2
82 	 * as cache.  We must ensure that they get enabled here.
83 	 */
84 	for_each_node_by_name(np, "l2-cache-controller") {
85 		struct resource r[2];
86 		void __iomem *l2_base;
87 
88 		/* Only MPC8548, MPC8540, and MPC8560 boards are affected */
89 		if (!of_device_is_compatible(np,
90 				    "fsl,mpc8548-l2-cache-controller") &&
91 		    !of_device_is_compatible(np,
92 				    "fsl,mpc8540-l2-cache-controller") &&
93 		    !of_device_is_compatible(np,
94 				    "fsl,mpc8560-l2-cache-controller"))
95 			continue;
96 
97 		err = of_address_to_resource(np, 0, &r[0]);
98 		if (err) {
99 			printk(KERN_WARNING "xes_mpc85xx: Could not get "
100 			       "resource for device tree node '%pOF'",
101 			       np);
102 			continue;
103 		}
104 
105 		l2_base = ioremap(r[0].start, resource_size(&r[0]));
106 
107 		xes_mpc85xx_configure_l2(l2_base);
108 	}
109 }
110 
111 /*
112  * Setup the architecture
113  */
xes_mpc85xx_setup_arch(void)114 static void __init xes_mpc85xx_setup_arch(void)
115 {
116 	struct device_node *root;
117 	const char *model = "Unknown";
118 
119 	root = of_find_node_by_path("/");
120 	if (root == NULL)
121 		return;
122 
123 	model = of_get_property(root, "model", NULL);
124 
125 	printk(KERN_INFO "X-ES MPC85xx-based single-board computer: %s\n",
126 	       model + strlen("xes,"));
127 
128 	xes_mpc85xx_fixups();
129 
130 	mpc85xx_smp_init();
131 
132 	fsl_pci_assign_primary();
133 }
134 
135 machine_arch_initcall(xes_mpc8572, mpc85xx_common_publish_devices);
136 machine_arch_initcall(xes_mpc8548, mpc85xx_common_publish_devices);
137 machine_arch_initcall(xes_mpc8540, mpc85xx_common_publish_devices);
138 
139 /*
140  * Called very early, device-tree isn't unflattened
141  */
xes_mpc8572_probe(void)142 static int __init xes_mpc8572_probe(void)
143 {
144 	return of_machine_is_compatible("xes,MPC8572");
145 }
146 
xes_mpc8548_probe(void)147 static int __init xes_mpc8548_probe(void)
148 {
149 	return of_machine_is_compatible("xes,MPC8548");
150 }
151 
xes_mpc8540_probe(void)152 static int __init xes_mpc8540_probe(void)
153 {
154 	return of_machine_is_compatible("xes,MPC8540");
155 }
156 
define_machine(xes_mpc8572)157 define_machine(xes_mpc8572) {
158 	.name			= "X-ES MPC8572",
159 	.probe			= xes_mpc8572_probe,
160 	.setup_arch		= xes_mpc85xx_setup_arch,
161 	.init_IRQ		= xes_mpc85xx_pic_init,
162 #ifdef CONFIG_PCI
163 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
164 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
165 #endif
166 	.get_irq		= mpic_get_irq,
167 	.calibrate_decr		= generic_calibrate_decr,
168 	.progress		= udbg_progress,
169 };
170 
define_machine(xes_mpc8548)171 define_machine(xes_mpc8548) {
172 	.name			= "X-ES MPC8548",
173 	.probe			= xes_mpc8548_probe,
174 	.setup_arch		= xes_mpc85xx_setup_arch,
175 	.init_IRQ		= xes_mpc85xx_pic_init,
176 #ifdef CONFIG_PCI
177 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
178 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
179 #endif
180 	.get_irq		= mpic_get_irq,
181 	.calibrate_decr		= generic_calibrate_decr,
182 	.progress		= udbg_progress,
183 };
184 
define_machine(xes_mpc8540)185 define_machine(xes_mpc8540) {
186 	.name			= "X-ES MPC8540",
187 	.probe			= xes_mpc8540_probe,
188 	.setup_arch		= xes_mpc85xx_setup_arch,
189 	.init_IRQ		= xes_mpc85xx_pic_init,
190 #ifdef CONFIG_PCI
191 	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
192 	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
193 #endif
194 	.get_irq		= mpic_get_irq,
195 	.calibrate_decr		= generic_calibrate_decr,
196 	.progress		= udbg_progress,
197 };
198