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Linux/arch/powerpc/platforms/44x/ppc476.c

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  1 /*
  2  * PowerPC 476FPE board specific routines
  3  *
  4  * Copyright © 2013 Tony Breeds IBM Corporation
  5  * Copyright © 2013 Alistair Popple IBM Corporation
  6  *
  7  * Based on earlier code:
  8  *    Matt Porter <mporter@kernel.crashing.org>
  9  *    Copyright 2002-2005 MontaVista Software Inc.
 10  *
 11  *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 12  *    Copyright (c) 2003-2005 Zultys Technologies
 13  *
 14  *    Rewritten and ported to the merged powerpc tree:
 15  *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 16  *    Copyright © 2011 David Kliekamp IBM Corporation
 17  *
 18  * This program is free software; you can redistribute  it and/or modify it
 19  * under  the terms of  the GNU General  Public License as published by the
 20  * Free Software Foundation;  either version 2 of the  License, or (at your
 21  * option) any later version.
 22  */
 23 
 24 #include <linux/init.h>
 25 #include <linux/of.h>
 26 #include <linux/of_platform.h>
 27 #include <linux/rtc.h>
 28 
 29 #include <asm/machdep.h>
 30 #include <asm/prom.h>
 31 #include <asm/udbg.h>
 32 #include <asm/time.h>
 33 #include <asm/uic.h>
 34 #include <asm/ppc4xx.h>
 35 #include <asm/mpic.h>
 36 #include <asm/mmu.h>
 37 
 38 #include <linux/pci.h>
 39 #include <linux/i2c.h>
 40 
 41 static const struct of_device_id ppc47x_of_bus[] __initconst = {
 42         { .compatible = "ibm,plb4", },
 43         { .compatible = "ibm,plb6", },
 44         { .compatible = "ibm,opb", },
 45         { .compatible = "ibm,ebc", },
 46         {},
 47 };
 48 
 49 /* The EEPROM is missing and the default values are bogus.  This forces USB in
 50  * to EHCI mode */
 51 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
 52 {
 53         if (of_machine_is_compatible("ibm,currituck")) {
 54                 pci_write_config_dword(dev, 0xe0, 0x0114231f);
 55                 pci_write_config_dword(dev, 0xe4, 0x00006c40);
 56         }
 57 }
 58 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
 59 
 60 /* Akebono has an AVR microcontroller attached to the I2C bus
 61  * which is used to power off/reset the system. */
 62 
 63 /* AVR I2C Commands */
 64 #define AVR_PWRCTL_CMD (0x26)
 65 
 66 /* Flags for the power control I2C commands */
 67 #define AVR_PWRCTL_PWROFF (0x01)
 68 #define AVR_PWRCTL_RESET (0x02)
 69 
 70 static struct i2c_client *avr_i2c_client;
 71 static void __noreturn avr_halt_system(int pwrctl_flags)
 72 {
 73         /* Request the AVR to reset the system */
 74         i2c_smbus_write_byte_data(avr_i2c_client,
 75                                   AVR_PWRCTL_CMD, pwrctl_flags);
 76 
 77         /* Wait for system to be reset */
 78         while (1)
 79                 ;
 80 }
 81 
 82 static void avr_power_off_system(void)
 83 {
 84         avr_halt_system(AVR_PWRCTL_PWROFF);
 85 }
 86 
 87 static void __noreturn avr_reset_system(char *cmd)
 88 {
 89         avr_halt_system(AVR_PWRCTL_RESET);
 90 }
 91 
 92 static int avr_probe(struct i2c_client *client,
 93                             const struct i2c_device_id *id)
 94 {
 95         avr_i2c_client = client;
 96         ppc_md.restart = avr_reset_system;
 97         pm_power_off = avr_power_off_system;
 98         return 0;
 99 }
100 
101 static const struct i2c_device_id avr_id[] = {
102         { "akebono-avr", 0 },
103         { }
104 };
105 
106 static struct i2c_driver avr_driver = {
107         .driver = {
108                 .name = "akebono-avr",
109         },
110         .probe = avr_probe,
111         .id_table = avr_id,
112 };
113 
114 static int __init ppc47x_device_probe(void)
115 {
116         i2c_add_driver(&avr_driver);
117         of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
118 
119         return 0;
120 }
121 machine_device_initcall(ppc47x, ppc47x_device_probe);
122 
123 static void __init ppc47x_init_irq(void)
124 {
125         struct device_node *np;
126 
127         /* Find top level interrupt controller */
128         for_each_node_with_property(np, "interrupt-controller") {
129                 if (of_get_property(np, "interrupts", NULL) == NULL)
130                         break;
131         }
132         if (np == NULL)
133                 panic("Can't find top level interrupt controller");
134 
135         /* Check type and do appropriate initialization */
136         if (of_device_is_compatible(np, "chrp,open-pic")) {
137                 /* The MPIC driver will get everything it needs from the
138                  * device-tree, just pass 0 to all arguments
139                  */
140                 struct mpic *mpic =
141                         mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
142                 BUG_ON(mpic == NULL);
143                 mpic_init(mpic);
144                 ppc_md.get_irq = mpic_get_irq;
145         } else
146                 panic("Unrecognized top level interrupt controller");
147 }
148 
149 #ifdef CONFIG_SMP
150 static void smp_ppc47x_setup_cpu(int cpu)
151 {
152         mpic_setup_this_cpu();
153 }
154 
155 static int smp_ppc47x_kick_cpu(int cpu)
156 {
157         struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
158         const u64 *spin_table_addr_prop;
159         u32 *spin_table;
160         extern void start_secondary_47x(void);
161 
162         BUG_ON(cpunode == NULL);
163 
164         /* Assume spin table. We could test for the enable-method in
165          * the device-tree but currently there's little point as it's
166          * our only supported method
167          */
168         spin_table_addr_prop =
169                 of_get_property(cpunode, "cpu-release-addr", NULL);
170 
171         if (spin_table_addr_prop == NULL) {
172                 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
173                        cpu);
174                 return 1;
175         }
176 
177         /* Assume it's mapped as part of the linear mapping. This is a bit
178          * fishy but will work fine for now
179          *
180          * XXX: Is there any reason to assume differently?
181          */
182         spin_table = (u32 *)__va(*spin_table_addr_prop);
183         pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
184 
185         spin_table[3] = cpu;
186         smp_wmb();
187         spin_table[1] = __pa(start_secondary_47x);
188         mb();
189 
190         return 0;
191 }
192 
193 static struct smp_ops_t ppc47x_smp_ops = {
194         .probe          = smp_mpic_probe,
195         .message_pass   = smp_mpic_message_pass,
196         .setup_cpu      = smp_ppc47x_setup_cpu,
197         .kick_cpu       = smp_ppc47x_kick_cpu,
198         .give_timebase  = smp_generic_give_timebase,
199         .take_timebase  = smp_generic_take_timebase,
200 };
201 
202 static void __init ppc47x_smp_init(void)
203 {
204         if (mmu_has_feature(MMU_FTR_TYPE_47x))
205                 smp_ops = &ppc47x_smp_ops;
206 }
207 
208 #else /* CONFIG_SMP */
209 static void __init ppc47x_smp_init(void) { }
210 #endif /* CONFIG_SMP */
211 
212 static void __init ppc47x_setup_arch(void)
213 {
214 
215         /* No need to check the DMA config as we /know/ our windows are all of
216          * RAM.  Lets hope that doesn't change */
217         swiotlb_detect_4g();
218 
219         ppc47x_smp_init();
220 }
221 
222 static int board_rev = -1;
223 static int __init ppc47x_get_board_rev(void)
224 {
225         int reg;
226         u8 *fpga;
227         struct device_node *np = NULL;
228 
229         if (of_machine_is_compatible("ibm,currituck")) {
230                 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
231                 reg = 0;
232         } else if (of_machine_is_compatible("ibm,akebono")) {
233                 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
234                 reg = 2;
235         }
236 
237         if (!np)
238                 goto fail;
239 
240         fpga = (u8 *) of_iomap(np, 0);
241         of_node_put(np);
242         if (!fpga)
243                 goto fail;
244 
245         board_rev = ioread8(fpga + reg) & 0x03;
246         pr_info("%s: Found board revision %d\n", __func__, board_rev);
247         iounmap(fpga);
248         return 0;
249 
250 fail:
251         pr_info("%s: Unable to find board revision\n", __func__);
252         return 0;
253 }
254 machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
255 
256 /* Use USB controller should have been hardware swizzled but it wasn't :( */
257 static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
258 {
259         if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
260                                       dev->device == 0x00e0)) {
261                 if (board_rev == 0) {
262                         dev->irq = irq_create_mapping(NULL, 47);
263                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
264                 } else if (board_rev == 2) {
265                         dev->irq = irq_create_mapping(NULL, 49);
266                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
267                 } else {
268                         pr_alert("%s: Unknown board revision\n", __func__);
269                 }
270         }
271 }
272 
273 /*
274  * Called very early, MMU is off, device-tree isn't unflattened
275  */
276 static int __init ppc47x_probe(void)
277 {
278         if (of_machine_is_compatible("ibm,akebono"))
279                 return 1;
280 
281         if (of_machine_is_compatible("ibm,currituck")) {
282                 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
283                 return 1;
284         }
285 
286         return 0;
287 }
288 
289 define_machine(ppc47x) {
290         .name                   = "PowerPC 47x",
291         .probe                  = ppc47x_probe,
292         .progress               = udbg_progress,
293         .init_IRQ               = ppc47x_init_irq,
294         .setup_arch             = ppc47x_setup_arch,
295         .restart                = ppc4xx_reset_system,
296         .calibrate_decr         = generic_calibrate_decr,
297 };
298 

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