1 /*
2 * GE SBC310 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/time.h>
28 #include <asm/machdep.h>
29 #include <asm/pci-bridge.h>
30 #include <asm/prom.h>
31 #include <mm/mmu_decl.h>
32 #include <asm/udbg.h>
33
34 #include <asm/mpic.h>
35 #include <asm/nvram.h>
36
37 #include <sysdev/fsl_pci.h>
38 #include <sysdev/fsl_soc.h>
39 #include <sysdev/ge/ge_pic.h>
40
41 #include "mpc86xx.h"
42
43 #undef DEBUG
44
45 #ifdef DEBUG
46 #define DBG (fmt...) do { printk(KERN_ERR "SBC310: " fmt); } while (0)
47 #else
48 #define DBG (fmt...) do { } while (0)
49 #endif
50
51 void __iomem *sbc310_regs;
52
gef_sbc310_init_irq(void)53 static void __init gef_sbc310_init_irq(void)
54 {
55 struct device_node *cascade_node = NULL;
56
57 mpc86xx_init_irq();
58
59 /*
60 * There is a simple interrupt handler in the main FPGA, this needs
61 * to be cascaded into the MPIC
62 */
63 cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic");
64 if (!cascade_node) {
65 printk(KERN_WARNING "SBC310: No FPGA PIC\n");
66 return;
67 }
68
69 gef_pic_init(cascade_node);
70 of_node_put(cascade_node);
71 }
72
gef_sbc310_setup_arch(void)73 static void __init gef_sbc310_setup_arch(void)
74 {
75 struct device_node *regs;
76 #ifdef CONFIG_PCI
77 struct device_node *np;
78
79 for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") {
80 fsl_add_bridge(np, 1);
81 }
82 #endif
83
84 printk(KERN_INFO "GE Intelligent Platforms SBC310 6U VPX SBC\n");
85
86 #ifdef CONFIG_SMP
87 mpc86xx_smp_init();
88 #endif
89
90 /* Remap basic board registers */
91 regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs");
92 if (regs) {
93 sbc310_regs = of_iomap(regs, 0);
94 if (sbc310_regs == NULL)
95 printk(KERN_WARNING "Unable to map board registers\n");
96 of_node_put(regs);
97 }
98
99 #if defined(CONFIG_MMIO_NVRAM)
100 mmio_nvram_init();
101 #endif
102 }
103
104 /* Return the PCB revision */
gef_sbc310_get_board_id(void)105 static unsigned int gef_sbc310_get_board_id(void)
106 {
107 unsigned int reg;
108
109 reg = ioread32(sbc310_regs);
110 return reg & 0xff;
111 }
112
113 /* Return the PCB revision */
gef_sbc310_get_pcb_rev(void)114 static unsigned int gef_sbc310_get_pcb_rev(void)
115 {
116 unsigned int reg;
117
118 reg = ioread32(sbc310_regs);
119 return (reg >> 8) & 0xff;
120 }
121
122 /* Return the board (software) revision */
gef_sbc310_get_board_rev(void)123 static unsigned int gef_sbc310_get_board_rev(void)
124 {
125 unsigned int reg;
126
127 reg = ioread32(sbc310_regs);
128 return (reg >> 16) & 0xff;
129 }
130
131 /* Return the FPGA revision */
gef_sbc310_get_fpga_rev(void)132 static unsigned int gef_sbc310_get_fpga_rev(void)
133 {
134 unsigned int reg;
135
136 reg = ioread32(sbc310_regs);
137 return (reg >> 24) & 0xf;
138 }
139
gef_sbc310_show_cpuinfo(struct seq_file * m)140 static void gef_sbc310_show_cpuinfo(struct seq_file *m)
141 {
142 uint svid = mfspr(SPRN_SVR);
143
144 seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
145
146 seq_printf(m, "Board ID\t: 0x%2.2x\n", gef_sbc310_get_board_id());
147 seq_printf(m, "Revision\t: %u%c\n", gef_sbc310_get_pcb_rev(),
148 ('A' + gef_sbc310_get_board_rev() - 1));
149 seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc310_get_fpga_rev());
150
151 seq_printf(m, "SVR\t\t: 0x%x\n", svid);
152
153 }
154
gef_sbc310_nec_fixup(struct pci_dev * pdev)155 static void __init gef_sbc310_nec_fixup(struct pci_dev *pdev)
156 {
157 unsigned int val;
158
159 /* Do not do the fixup on other platforms! */
160 if (!machine_is(gef_sbc310))
161 return;
162
163 printk(KERN_INFO "Running NEC uPD720101 Fixup\n");
164
165 /* Ensure only ports 1 & 2 are enabled */
166 pci_read_config_dword(pdev, 0xe0, &val);
167 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
168
169 /* System clock is 48-MHz Oscillator and EHCI Enabled. */
170 pci_write_config_dword(pdev, 0xe4, 1 << 5);
171 }
172 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
173 gef_sbc310_nec_fixup);
174
175 /*
176 * Called very early, device-tree isn't unflattened
177 *
178 * This function is called to determine whether the BSP is compatible with the
179 * supplied device-tree, which is assumed to be the correct one for the actual
180 * board. It is expected thati, in the future, a kernel may support multiple
181 * boards.
182 */
gef_sbc310_probe(void)183 static int __init gef_sbc310_probe(void)
184 {
185 unsigned long root = of_get_flat_dt_root();
186
187 if (of_flat_dt_is_compatible(root, "gef,sbc310"))
188 return 1;
189
190 return 0;
191 }
192
mpc86xx_time_init(void)193 static long __init mpc86xx_time_init(void)
194 {
195 unsigned int temp;
196
197 /* Set the time base to zero */
198 mtspr(SPRN_TBWL, 0);
199 mtspr(SPRN_TBWU, 0);
200
201 temp = mfspr(SPRN_HID0);
202 temp |= HID0_TBEN;
203 mtspr(SPRN_HID0, temp);
204 asm volatile("isync");
205
206 return 0;
207 }
208
209 static __initdata struct of_device_id of_bus_ids[] = {
210 { .compatible = "simple-bus", },
211 { .compatible = "gianfar", },
212 {},
213 };
214
declare_of_platform_devices(void)215 static int __init declare_of_platform_devices(void)
216 {
217 printk(KERN_DEBUG "Probe platform devices\n");
218 of_platform_bus_probe(NULL, of_bus_ids, NULL);
219
220 return 0;
221 }
222 machine_device_initcall(gef_sbc310, declare_of_platform_devices);
223
define_machine(gef_sbc310)224 define_machine(gef_sbc310) {
225 .name = "GE SBC310",
226 .probe = gef_sbc310_probe,
227 .setup_arch = gef_sbc310_setup_arch,
228 .init_IRQ = gef_sbc310_init_irq,
229 .show_cpuinfo = gef_sbc310_show_cpuinfo,
230 .get_irq = mpic_get_irq,
231 .restart = fsl_rstcr_restart,
232 .time_init = mpc86xx_time_init,
233 .calibrate_decr = generic_calibrate_decr,
234 .progress = udbg_progress,
235 #ifdef CONFIG_PCI
236 .pcibios_fixup_bus = fsl_pcibios_fixup_bus,
237 #endif
238 };
239