xref: /linux/arch/powerpc/include/asm/machdep.h (revision 28da734d)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_MACHDEP_H
3 #define _ASM_POWERPC_MACHDEP_H
4 #ifdef __KERNEL__
5 
6 #include <linux/compiler.h>
7 #include <linux/seq_file.h>
8 #include <linux/init.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/export.h>
11 
12 struct pt_regs;
13 struct pci_bus;
14 struct device_node;
15 struct iommu_table;
16 struct rtc_time;
17 struct file;
18 struct pci_controller;
19 struct kimage;
20 struct pci_host_bridge;
21 
22 struct machdep_calls {
23 	const char	*name;
24 	const char	*compatible;
25 	const char * const *compatibles;
26 #ifdef CONFIG_PPC64
27 #ifdef CONFIG_PM
28 	void		(*iommu_restore)(void);
29 #endif
30 #ifdef CONFIG_MEMORY_HOTPLUG
31 	unsigned long	(*memory_block_size)(void);
32 #endif
33 #endif /* CONFIG_PPC64 */
34 
35 	void		(*dma_set_mask)(struct device *dev, u64 dma_mask);
36 
37 	int		(*probe)(void);
38 	void		(*setup_arch)(void); /* Optional, may be NULL */
39 	/* Optional, may be NULL. */
40 	void		(*show_cpuinfo)(struct seq_file *m);
41 	/* Returns the current operating frequency of "cpu" in Hz */
42 	unsigned long  	(*get_proc_freq)(unsigned int cpu);
43 
44 	void		(*init_IRQ)(void);
45 
46 	/* Return an irq, or 0 to indicate there are none pending. */
47 	unsigned int	(*get_irq)(void);
48 
49 	/* PCI stuff */
50 	/* Called after allocating resources */
51 	void		(*pcibios_fixup)(void);
52 	void		(*pci_irq_fixup)(struct pci_dev *dev);
53 	int		(*pcibios_root_bridge_prepare)(struct pci_host_bridge
54 				*bridge);
55 
56 	/* finds all the pci_controllers present at boot */
57 	void 		(*discover_phbs)(void);
58 
59 	/* To setup PHBs when using automatic OF platform driver for PCI */
60 	int		(*pci_setup_phb)(struct pci_controller *host);
61 
62 	void __noreturn	(*restart)(char *cmd);
63 	void __noreturn (*halt)(void);
64 	void		(*panic)(char *str);
65 
66 	long		(*time_init)(void); /* Optional, may be NULL */
67 
68 	int		(*set_rtc_time)(struct rtc_time *);
69 	void		(*get_rtc_time)(struct rtc_time *);
70 	time64_t	(*get_boot_time)(void);
71 
72 	void		(*calibrate_decr)(void);
73 
74 	void		(*progress)(char *, unsigned short);
75 
76 	/* Interface for platform error logging */
77 	void 		(*log_error)(char *buf, unsigned int err_type, int fatal);
78 
79 	unsigned char 	(*nvram_read_val)(int addr);
80 	void		(*nvram_write_val)(int addr, unsigned char val);
81 	ssize_t		(*nvram_write)(char *buf, size_t count, loff_t *index);
82 	ssize_t		(*nvram_read)(char *buf, size_t count, loff_t *index);
83 	ssize_t		(*nvram_size)(void);
84 	void		(*nvram_sync)(void);
85 
86 	/* Exception handlers */
87 	int		(*system_reset_exception)(struct pt_regs *regs);
88 	int 		(*machine_check_exception)(struct pt_regs *regs);
89 	int		(*handle_hmi_exception)(struct pt_regs *regs);
90 
91 	/* Early exception handlers called in realmode */
92 	int		(*hmi_exception_early)(struct pt_regs *regs);
93 	long		(*machine_check_early)(struct pt_regs *regs);
94 
95 	/* Called during machine check exception to retrive fixup address. */
96 	bool		(*mce_check_early_recovery)(struct pt_regs *regs);
97 
98 	void            (*machine_check_log_err)(void);
99 
100 	/* Motherboard/chipset features. This is a kind of general purpose
101 	 * hook used to control some machine specific features (like reset
102 	 * lines, chip power control, etc...).
103 	 */
104 	long	 	(*feature_call)(unsigned int feature, ...);
105 
106 	/* Get legacy PCI/IDE interrupt mapping */
107 	int		(*pci_get_legacy_ide_irq)(struct pci_dev *dev, int channel);
108 
109 	/* Get access protection for /dev/mem */
110 	pgprot_t	(*phys_mem_access_prot)(unsigned long pfn,
111 						unsigned long size,
112 						pgprot_t vma_prot);
113 
114 	/*
115 	 * Function for waiting for work with reduced power in idle loop;
116 	 * called with interrupts disabled.
117 	 */
118 	void		(*power_save)(void);
119 
120 	/* Function to enable performance monitor counters for this
121 	   platform, called once per cpu. */
122 	void		(*enable_pmcs)(void);
123 
124 	/* Set DABR for this platform, leave empty for default implementation */
125 	int		(*set_dabr)(unsigned long dabr,
126 				    unsigned long dabrx);
127 
128 	/* Set DAWR for this platform, leave empty for default implementation */
129 	int		(*set_dawr)(int nr, unsigned long dawr,
130 				    unsigned long dawrx);
131 
132 #ifdef CONFIG_PPC32	/* XXX for now */
133 	/* A general init function, called by ppc_init in init/main.c.
134 	   May be NULL. */
135 	void		(*init)(void);
136 
137 	/*
138 	 * optional PCI "hooks"
139 	 */
140 	/* Called at then very end of pcibios_init() */
141 	void (*pcibios_after_init)(void);
142 
143 #endif /* CONFIG_PPC32 */
144 
145 	/* Called in indirect_* to avoid touching devices */
146 	int (*pci_exclude_device)(struct pci_controller *, unsigned char, unsigned char);
147 
148 	/* Called after PPC generic resource fixup to perform
149 	   machine specific fixups */
150 	void (*pcibios_fixup_resources)(struct pci_dev *);
151 
152 	/* Called for each PCI bus in the system when it's probed */
153 	void (*pcibios_fixup_bus)(struct pci_bus *);
154 
155 	/* Called after scan and before resource survey */
156 	void (*pcibios_fixup_phb)(struct pci_controller *hose);
157 
158 	/*
159 	 * Called after device has been added to bus and
160 	 * before sysfs has been created.
161 	 */
162 	void (*pcibios_bus_add_device)(struct pci_dev *pdev);
163 
164 	resource_size_t (*pcibios_default_alignment)(void);
165 
166 #ifdef CONFIG_PCI_IOV
167 	void (*pcibios_fixup_sriov)(struct pci_dev *pdev);
168 	resource_size_t (*pcibios_iov_resource_alignment)(struct pci_dev *, int resno);
169 	int (*pcibios_sriov_enable)(struct pci_dev *pdev, u16 num_vfs);
170 	int (*pcibios_sriov_disable)(struct pci_dev *pdev);
171 #endif /* CONFIG_PCI_IOV */
172 
173 	/* Called to shutdown machine specific hardware not already controlled
174 	 * by other drivers.
175 	 */
176 	void (*machine_shutdown)(void);
177 
178 #ifdef CONFIG_KEXEC_CORE
179 	void (*kexec_cpu_down)(int crash_shutdown, int secondary);
180 
181 	/* Called to perform the _real_ kexec.
182 	 * Do NOT allocate memory or fail here. We are past the point of
183 	 * no return.
184 	 */
185 	void (*machine_kexec)(struct kimage *image);
186 #endif /* CONFIG_KEXEC_CORE */
187 
188 #ifdef CONFIG_SUSPEND
189 	/* These are called to disable and enable, respectively, IRQs when
190 	 * entering a suspend state.  If NULL, then the generic versions
191 	 * will be called.  The generic versions disable/enable the
192 	 * decrementer along with interrupts.
193 	 */
194 	void (*suspend_disable_irqs)(void);
195 	void (*suspend_enable_irqs)(void);
196 #endif
197 
198 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
199 	ssize_t (*cpu_probe)(const char *, size_t);
200 	ssize_t (*cpu_release)(const char *, size_t);
201 #endif
202 
203 	int (*get_random_seed)(unsigned long *v);
204 };
205 
206 extern void e500_idle(void);
207 extern void power4_idle(void);
208 extern void ppc6xx_idle(void);
209 
210 /*
211  * ppc_md contains a copy of the machine description structure for the
212  * current platform. machine_id contains the initial address where the
213  * description was found during boot.
214  */
215 extern struct machdep_calls ppc_md;
216 extern struct machdep_calls *machine_id;
217 
218 #define __machine_desc __section(".machine.desc")
219 
220 #define define_machine(name)					\
221 	extern struct machdep_calls mach_##name;		\
222 	EXPORT_SYMBOL(mach_##name);				\
223 	struct machdep_calls mach_##name __machine_desc =
224 
__machine_is(const struct machdep_calls * md)225 static inline bool __machine_is(const struct machdep_calls *md)
226 {
227 	WARN_ON(!machine_id); // complain if used before probe_machine()
228 	return machine_id == md;
229 }
230 
231 #define machine_is(name)                                        \
232 	({                                                      \
233 		extern struct machdep_calls mach_##name __weak; \
234 		__machine_is(&mach_##name);                     \
235 	})
236 
log_error(char * buf,unsigned int err_type,int fatal)237 static inline void log_error(char *buf, unsigned int err_type, int fatal)
238 {
239 	if (ppc_md.log_error)
240 		ppc_md.log_error(buf, err_type, fatal);
241 }
242 
243 #define __define_machine_initcall(mach, fn, id) \
244 	static int __init __machine_initcall_##mach##_##fn(void) { \
245 		if (machine_is(mach)) return fn(); \
246 		return 0; \
247 	} \
248 	__define_initcall(__machine_initcall_##mach##_##fn, id);
249 
250 #define machine_early_initcall(mach, fn)	__define_machine_initcall(mach, fn, early)
251 #define machine_core_initcall(mach, fn)		__define_machine_initcall(mach, fn, 1)
252 #define machine_core_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 1s)
253 #define machine_postcore_initcall(mach, fn)	__define_machine_initcall(mach, fn, 2)
254 #define machine_postcore_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 2s)
255 #define machine_arch_initcall(mach, fn)		__define_machine_initcall(mach, fn, 3)
256 #define machine_arch_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 3s)
257 #define machine_subsys_initcall(mach, fn)	__define_machine_initcall(mach, fn, 4)
258 #define machine_subsys_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 4s)
259 #define machine_fs_initcall(mach, fn)		__define_machine_initcall(mach, fn, 5)
260 #define machine_fs_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 5s)
261 #define machine_rootfs_initcall(mach, fn)	__define_machine_initcall(mach, fn, rootfs)
262 #define machine_device_initcall(mach, fn)	__define_machine_initcall(mach, fn, 6)
263 #define machine_device_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 6s)
264 #define machine_late_initcall(mach, fn)		__define_machine_initcall(mach, fn, 7)
265 #define machine_late_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 7s)
266 
267 #endif /* __KERNEL__ */
268 #endif /* _ASM_POWERPC_MACHDEP_H */
269