1 /*
2 * GE SBC610 board support
3 *
4 * Author: Martyn Welch <martyn.welch@ge.com>
5 *
6 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * Based on: mpc86xx_hpcn.c (MPC86xx HPCN board specific routines)
14 * Copyright 2006 Freescale Semiconductor Inc.
15 *
16 * NEC fixup adapted from arch/mips/pci/fixup-lm2e.c
17 */
18
19 #include <linux/stddef.h>
20 #include <linux/kernel.h>
21 #include <linux/pci.h>
22 #include <linux/kdev_t.h>
23 #include <linux/delay.h>
24 #include <linux/seq_file.h>
25 #include <linux/of_platform.h>
26
27 #include <asm/system.h>
28 #include <asm/time.h>
29 #include <asm/machdep.h>
30 #include <asm/pci-bridge.h>
31 #include <asm/prom.h>
32 #include <mm/mmu_decl.h>
33 #include <asm/udbg.h>
34
35 #include <asm/mpic.h>
36 #include <asm/nvram.h>
37
38 #include <sysdev/fsl_pci.h>
39 #include <sysdev/fsl_soc.h>
40
41 #include "mpc86xx.h"
42 #include "gef_pic.h"
43
44 #undef DEBUG
45
46 #ifdef DEBUG
47 #define DBG (fmt...) do { printk(KERN_ERR "SBC610: " fmt); } while (0)
48 #else
49 #define DBG (fmt...) do { } while (0)
50 #endif
51
52 void __iomem *sbc610_regs;
53
gef_sbc610_init_irq(void)54 static void __init gef_sbc610_init_irq(void)
55 {
56 struct device_node *cascade_node = NULL;
57
58 mpc86xx_init_irq();
59
60 /*
61 * There is a simple interrupt handler in the main FPGA, this needs
62 * to be cascaded into the MPIC
63 */
64 cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic");
65 if (!cascade_node) {
66 printk(KERN_WARNING "SBC610: No FPGA PIC\n");
67 return;
68 }
69
70 gef_pic_init(cascade_node);
71 of_node_put(cascade_node);
72 }
73
gef_sbc610_setup_arch(void)74 static void __init gef_sbc610_setup_arch(void)
75 {
76 struct device_node *regs;
77 #ifdef CONFIG_PCI
78 struct device_node *np;
79
80 for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") {
81 fsl_add_bridge(np, 1);
82 }
83 #endif
84
85 printk(KERN_INFO "GE Intelligent Platforms SBC610 6U VPX SBC\n");
86
87 #ifdef CONFIG_SMP
88 mpc86xx_smp_init();
89 #endif
90
91 /* Remap basic board registers */
92 regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs");
93 if (regs) {
94 sbc610_regs = of_iomap(regs, 0);
95 if (sbc610_regs == NULL)
96 printk(KERN_WARNING "Unable to map board registers\n");
97 of_node_put(regs);
98 }
99
100 #if defined(CONFIG_MMIO_NVRAM)
101 mmio_nvram_init();
102 #endif
103 }
104
105 /* Return the PCB revision */
gef_sbc610_get_pcb_rev(void)106 static unsigned int gef_sbc610_get_pcb_rev(void)
107 {
108 unsigned int reg;
109
110 reg = ioread32(sbc610_regs);
111 return (reg >> 8) & 0xff;
112 }
113
114 /* Return the board (software) revision */
gef_sbc610_get_board_rev(void)115 static unsigned int gef_sbc610_get_board_rev(void)
116 {
117 unsigned int reg;
118
119 reg = ioread32(sbc610_regs);
120 return (reg >> 16) & 0xff;
121 }
122
123 /* Return the FPGA revision */
gef_sbc610_get_fpga_rev(void)124 static unsigned int gef_sbc610_get_fpga_rev(void)
125 {
126 unsigned int reg;
127
128 reg = ioread32(sbc610_regs);
129 return (reg >> 24) & 0xf;
130 }
131
gef_sbc610_show_cpuinfo(struct seq_file * m)132 static void gef_sbc610_show_cpuinfo(struct seq_file *m)
133 {
134 uint svid = mfspr(SPRN_SVR);
135
136 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
137
138 seq_printf(m, "Revision\t: %u%c\n", gef_sbc610_get_pcb_rev(),
139 ('A' + gef_sbc610_get_board_rev() - 1));
140 seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc610_get_fpga_rev());
141
142 seq_printf(m, "SVR\t\t: 0x%x\n", svid);
143 }
144
gef_sbc610_nec_fixup(struct pci_dev * pdev)145 static void __init gef_sbc610_nec_fixup(struct pci_dev *pdev)
146 {
147 unsigned int val;
148
149 /* Do not do the fixup on other platforms! */
150 if (!machine_is(gef_sbc610))
151 return;
152
153 printk(KERN_INFO "Running NEC uPD720101 Fixup\n");
154
155 /* Ensure ports 1, 2, 3, 4 & 5 are enabled */
156 pci_read_config_dword(pdev, 0xe0, &val);
157 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x5);
158
159 /* System clock is 48-MHz Oscillator and EHCI Enabled. */
160 pci_write_config_dword(pdev, 0xe4, 1 << 5);
161 }
162 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
163 gef_sbc610_nec_fixup);
164
165 /*
166 * Called very early, device-tree isn't unflattened
167 *
168 * This function is called to determine whether the BSP is compatible with the
169 * supplied device-tree, which is assumed to be the correct one for the actual
170 * board. It is expected thati, in the future, a kernel may support multiple
171 * boards.
172 */
gef_sbc610_probe(void)173 static int __init gef_sbc610_probe(void)
174 {
175 unsigned long root = of_get_flat_dt_root();
176
177 if (of_flat_dt_is_compatible(root, "gef,sbc610"))
178 return 1;
179
180 return 0;
181 }
182
mpc86xx_time_init(void)183 static long __init mpc86xx_time_init(void)
184 {
185 unsigned int temp;
186
187 /* Set the time base to zero */
188 mtspr(SPRN_TBWL, 0);
189 mtspr(SPRN_TBWU, 0);
190
191 temp = mfspr(SPRN_HID0);
192 temp |= HID0_TBEN;
193 mtspr(SPRN_HID0, temp);
194 asm volatile("isync");
195
196 return 0;
197 }
198
199 static __initdata struct of_device_id of_bus_ids[] = {
200 { .compatible = "simple-bus", },
201 { .compatible = "gianfar", },
202 {},
203 };
204
declare_of_platform_devices(void)205 static int __init declare_of_platform_devices(void)
206 {
207 printk(KERN_DEBUG "Probe platform devices\n");
208 of_platform_bus_probe(NULL, of_bus_ids, NULL);
209
210 return 0;
211 }
212 machine_device_initcall(gef_sbc610, declare_of_platform_devices);
213
define_machine(gef_sbc610)214 define_machine(gef_sbc610) {
215 .name = "GE SBC610",
216 .probe = gef_sbc610_probe,
217 .setup_arch = gef_sbc610_setup_arch,
218 .init_IRQ = gef_sbc610_init_irq,
219 .show_cpuinfo = gef_sbc610_show_cpuinfo,
220 .get_irq = mpic_get_irq,
221 .restart = fsl_rstcr_restart,
222 .time_init = mpc86xx_time_init,
223 .calibrate_decr = generic_calibrate_decr,
224 .progress = udbg_progress,
225 #ifdef CONFIG_PCI
226 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
227 #endif
228 };
229