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Linux/arch/powerpc/platforms/86xx/gef_sbc610.c

  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/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 "SBC610: " fmt); } while (0)
 47 #else
 48 #define DBG (fmt...) do { } while (0)
 49 #endif
 50 
 51 void __iomem *sbc610_regs;
 52 
 53 static void __init gef_sbc610_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 "SBC610: No FPGA PIC\n");
 66                 return;
 67         }
 68 
 69         gef_pic_init(cascade_node);
 70         of_node_put(cascade_node);
 71 }
 72 
 73 static void __init gef_sbc610_setup_arch(void)
 74 {
 75         struct device_node *regs;
 76 
 77         printk(KERN_INFO "GE Intelligent Platforms SBC610 6U VPX SBC\n");
 78 
 79 #ifdef CONFIG_SMP
 80         mpc86xx_smp_init();
 81 #endif
 82 
 83         fsl_pci_assign_primary();
 84 
 85         /* Remap basic board registers */
 86         regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs");
 87         if (regs) {
 88                 sbc610_regs = of_iomap(regs, 0);
 89                 if (sbc610_regs == NULL)
 90                         printk(KERN_WARNING "Unable to map board registers\n");
 91                 of_node_put(regs);
 92         }
 93 
 94 #if defined(CONFIG_MMIO_NVRAM)
 95         mmio_nvram_init();
 96 #endif
 97 }
 98 
 99 /* Return the PCB revision */
100 static unsigned int gef_sbc610_get_pcb_rev(void)
101 {
102         unsigned int reg;
103 
104         reg = ioread32(sbc610_regs);
105         return (reg >> 8) & 0xff;
106 }
107 
108 /* Return the board (software) revision */
109 static unsigned int gef_sbc610_get_board_rev(void)
110 {
111         unsigned int reg;
112 
113         reg = ioread32(sbc610_regs);
114         return (reg >> 16) & 0xff;
115 }
116 
117 /* Return the FPGA revision */
118 static unsigned int gef_sbc610_get_fpga_rev(void)
119 {
120         unsigned int reg;
121 
122         reg = ioread32(sbc610_regs);
123         return (reg >> 24) & 0xf;
124 }
125 
126 static void gef_sbc610_show_cpuinfo(struct seq_file *m)
127 {
128         uint svid = mfspr(SPRN_SVR);
129 
130         seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
131 
132         seq_printf(m, "Revision\t: %u%c\n", gef_sbc610_get_pcb_rev(),
133                 ('A' + gef_sbc610_get_board_rev() - 1));
134         seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc610_get_fpga_rev());
135 
136         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
137 }
138 
139 static void gef_sbc610_nec_fixup(struct pci_dev *pdev)
140 {
141         unsigned int val;
142 
143         /* Do not do the fixup on other platforms! */
144         if (!machine_is(gef_sbc610))
145                 return;
146 
147         printk(KERN_INFO "Running NEC uPD720101 Fixup\n");
148 
149         /* Ensure ports 1, 2, 3, 4 & 5 are enabled */
150         pci_read_config_dword(pdev, 0xe0, &val);
151         pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x5);
152 
153         /* System clock is 48-MHz Oscillator and EHCI Enabled. */
154         pci_write_config_dword(pdev, 0xe4, 1 << 5);
155 }
156 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
157         gef_sbc610_nec_fixup);
158 
159 /*
160  * Called very early, device-tree isn't unflattened
161  *
162  * This function is called to determine whether the BSP is compatible with the
163  * supplied device-tree, which is assumed to be the correct one for the actual
164  * board. It is expected thati, in the future, a kernel may support multiple
165  * boards.
166  */
167 static int __init gef_sbc610_probe(void)
168 {
169         unsigned long root = of_get_flat_dt_root();
170 
171         if (of_flat_dt_is_compatible(root, "gef,sbc610"))
172                 return 1;
173 
174         return 0;
175 }
176 
177 static long __init mpc86xx_time_init(void)
178 {
179         unsigned int temp;
180 
181         /* Set the time base to zero */
182         mtspr(SPRN_TBWL, 0);
183         mtspr(SPRN_TBWU, 0);
184 
185         temp = mfspr(SPRN_HID0);
186         temp |= HID0_TBEN;
187         mtspr(SPRN_HID0, temp);
188         asm volatile("isync");
189 
190         return 0;
191 }
192 
193 static __initdata struct of_device_id of_bus_ids[] = {
194         { .compatible = "simple-bus", },
195         { .compatible = "gianfar", },
196         { .compatible = "fsl,mpc8641-pcie", },
197         {},
198 };
199 
200 static int __init declare_of_platform_devices(void)
201 {
202         printk(KERN_DEBUG "Probe platform devices\n");
203         of_platform_bus_probe(NULL, of_bus_ids, NULL);
204 
205         return 0;
206 }
207 machine_arch_initcall(gef_sbc610, declare_of_platform_devices);
208 
209 define_machine(gef_sbc610) {
210         .name                   = "GE SBC610",
211         .probe                  = gef_sbc610_probe,
212         .setup_arch             = gef_sbc610_setup_arch,
213         .init_IRQ               = gef_sbc610_init_irq,
214         .show_cpuinfo           = gef_sbc610_show_cpuinfo,
215         .get_irq                = mpic_get_irq,
216         .restart                = fsl_rstcr_restart,
217         .time_init              = mpc86xx_time_init,
218         .calibrate_decr         = generic_calibrate_decr,
219         .progress               = udbg_progress,
220 #ifdef CONFIG_PCI
221         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
222 #endif
223 };
224 

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