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/seq_file.h>
7 #include <linux/init.h>
8 #include <linux/dma-mapping.h>
9 #include <linux/export.h>
10 
11 #include <asm/setup.h>
12 
13 /* We export this macro for external modules like Alsa to know if
14  * ppc_md.feature_call is implemented or not
15  */
16 #define CONFIG_PPC_HAS_FEATURE_CALLS
17 
18 struct pt_regs;
19 struct pci_bus;
20 struct device_node;
21 struct iommu_table;
22 struct rtc_time;
23 struct file;
24 struct pci_controller;
25 struct kimage;
26 struct pci_host_bridge;
27 
28 struct machdep_calls {
29 	char		*name;
30 #ifdef CONFIG_PPC64
31 #ifdef CONFIG_PM
32 	void		(*iommu_restore)(void);
33 #endif
34 #ifdef CONFIG_MEMORY_HOTPLUG
35 	unsigned long	(*memory_block_size)(void);
36 #endif
37 #endif /* CONFIG_PPC64 */
38 
39 	void		(*dma_set_mask)(struct device *dev, u64 dma_mask);
40 
41 	int		(*probe)(void);
42 	void		(*setup_arch)(void); /* Optional, may be NULL */
43 	/* Optional, may be NULL. */
44 	void		(*show_cpuinfo)(struct seq_file *m);
45 	/* Returns the current operating frequency of "cpu" in Hz */
46 	unsigned long  	(*get_proc_freq)(unsigned int cpu);
47 
48 	void		(*init_IRQ)(void);
49 
50 	/* Return an irq, or 0 to indicate there are none pending. */
51 	unsigned int	(*get_irq)(void);
52 
53 	/* PCI stuff */
54 	/* Called after allocating resources */
55 	void		(*pcibios_fixup)(void);
56 	void		(*pci_irq_fixup)(struct pci_dev *dev);
57 	int		(*pcibios_root_bridge_prepare)(struct pci_host_bridge
58 				*bridge);
59 
60 	/* finds all the pci_controllers present at boot */
61 	void 		(*discover_phbs)(void);
62 
63 	/* To setup PHBs when using automatic OF platform driver for PCI */
64 	int		(*pci_setup_phb)(struct pci_controller *host);
65 
66 	void __noreturn	(*restart)(char *cmd);
67 	void __noreturn (*halt)(void);
68 	void		(*panic)(char *str);
69 
70 	long		(*time_init)(void); /* Optional, may be NULL */
71 
72 	int		(*set_rtc_time)(struct rtc_time *);
73 	void		(*get_rtc_time)(struct rtc_time *);
74 	time64_t	(*get_boot_time)(void);
75 
76 	void		(*calibrate_decr)(void);
77 
78 	void		(*progress)(char *, unsigned short);
79 
80 	/* Interface for platform error logging */
81 	void 		(*log_error)(char *buf, unsigned int err_type, int fatal);
82 
83 	unsigned char 	(*nvram_read_val)(int addr);
84 	void		(*nvram_write_val)(int addr, unsigned char val);
85 	ssize_t		(*nvram_write)(char *buf, size_t count, loff_t *index);
86 	ssize_t		(*nvram_read)(char *buf, size_t count, loff_t *index);
87 	ssize_t		(*nvram_size)(void);
88 	void		(*nvram_sync)(void);
89 
90 	/* Exception handlers */
91 	int		(*system_reset_exception)(struct pt_regs *regs);
92 	int 		(*machine_check_exception)(struct pt_regs *regs);
93 	int		(*handle_hmi_exception)(struct pt_regs *regs);
94 
95 	/* Early exception handlers called in realmode */
96 	int		(*hmi_exception_early)(struct pt_regs *regs);
97 	long		(*machine_check_early)(struct pt_regs *regs);
98 
99 	/* Called during machine check exception to retrive fixup address. */
100 	bool		(*mce_check_early_recovery)(struct pt_regs *regs);
101 
102 	/* Motherboard/chipset features. This is a kind of general purpose
103 	 * hook used to control some machine specific features (like reset
104 	 * lines, chip power control, etc...).
105 	 */
106 	long	 	(*feature_call)(unsigned int feature, ...);
107 
108 	/* Get legacy PCI/IDE interrupt mapping */
109 	int		(*pci_get_legacy_ide_irq)(struct pci_dev *dev, int channel);
110 
111 	/* Get access protection for /dev/mem */
112 	pgprot_t	(*phys_mem_access_prot)(struct file *file,
113 						unsigned long pfn,
114 						unsigned long size,
115 						pgprot_t vma_prot);
116 
117 	/*
118 	 * Function for waiting for work with reduced power in idle loop;
119 	 * called with interrupts disabled.
120 	 */
121 	void		(*power_save)(void);
122 
123 	/* Function to enable performance monitor counters for this
124 	   platform, called once per cpu. */
125 	void		(*enable_pmcs)(void);
126 
127 	/* Set DABR for this platform, leave empty for default implementation */
128 	int		(*set_dabr)(unsigned long dabr,
129 				    unsigned long dabrx);
130 
131 	/* Set DAWR for this platform, leave empty for default implementation */
132 	int		(*set_dawr)(int nr, unsigned long dawr,
133 				    unsigned long dawrx);
134 
135 #ifdef CONFIG_PPC32	/* XXX for now */
136 	/* A general init function, called by ppc_init in init/main.c.
137 	   May be NULL. */
138 	void		(*init)(void);
139 
140 	/*
141 	 * optional PCI "hooks"
142 	 */
143 	/* Called at then very end of pcibios_init() */
144 	void (*pcibios_after_init)(void);
145 
146 #endif /* CONFIG_PPC32 */
147 
148 	/* Called in indirect_* to avoid touching devices */
149 	int (*pci_exclude_device)(struct pci_controller *, unsigned char, unsigned char);
150 
151 	/* Called after PPC generic resource fixup to perform
152 	   machine specific fixups */
153 	void (*pcibios_fixup_resources)(struct pci_dev *);
154 
155 	/* Called for each PCI bus in the system when it's probed */
156 	void (*pcibios_fixup_bus)(struct pci_bus *);
157 
158 	/* Called after scan and before resource survey */
159 	void (*pcibios_fixup_phb)(struct pci_controller *hose);
160 
161 	/*
162 	 * Called after device has been added to bus and
163 	 * before sysfs has been created.
164 	 */
165 	void (*pcibios_bus_add_device)(struct pci_dev *pdev);
166 
167 	resource_size_t (*pcibios_default_alignment)(void);
168 
169 #ifdef CONFIG_PCI_IOV
170 	void (*pcibios_fixup_sriov)(struct pci_dev *pdev);
171 	resource_size_t (*pcibios_iov_resource_alignment)(struct pci_dev *, int resno);
172 	int (*pcibios_sriov_enable)(struct pci_dev *pdev, u16 num_vfs);
173 	int (*pcibios_sriov_disable)(struct pci_dev *pdev);
174 #endif /* CONFIG_PCI_IOV */
175 
176 	/* Called to shutdown machine specific hardware not already controlled
177 	 * by other drivers.
178 	 */
179 	void (*machine_shutdown)(void);
180 
181 #ifdef CONFIG_KEXEC_CORE
182 	void (*kexec_cpu_down)(int crash_shutdown, int secondary);
183 
184 	/* Called to perform the _real_ kexec.
185 	 * Do NOT allocate memory or fail here. We are past the point of
186 	 * no return.
187 	 */
188 	void (*machine_kexec)(struct kimage *image);
189 #endif /* CONFIG_KEXEC_CORE */
190 
191 #ifdef CONFIG_SUSPEND
192 	/* These are called to disable and enable, respectively, IRQs when
193 	 * entering a suspend state.  If NULL, then the generic versions
194 	 * will be called.  The generic versions disable/enable the
195 	 * decrementer along with interrupts.
196 	 */
197 	void (*suspend_disable_irqs)(void);
198 	void (*suspend_enable_irqs)(void);
199 #endif
200 
201 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
202 	ssize_t (*cpu_probe)(const char *, size_t);
203 	ssize_t (*cpu_release)(const char *, size_t);
204 #endif
205 
206 #ifdef CONFIG_ARCH_RANDOM
207 	int (*get_random_seed)(unsigned long *v);
208 #endif
209 };
210 
211 extern void e500_idle(void);
212 extern void power4_idle(void);
213 extern void ppc6xx_idle(void);
214 extern void book3e_idle(void);
215 
216 /*
217  * ppc_md contains a copy of the machine description structure for the
218  * current platform. machine_id contains the initial address where the
219  * description was found during boot.
220  */
221 extern struct machdep_calls ppc_md;
222 extern struct machdep_calls *machine_id;
223 
224 #define __machine_desc __section(".machine.desc")
225 
226 #define define_machine(name)					\
227 	extern struct machdep_calls mach_##name;		\
228 	EXPORT_SYMBOL(mach_##name);				\
229 	struct machdep_calls mach_##name __machine_desc =
230 
231 #define machine_is(name) \
232 	({ \
233 		extern struct machdep_calls mach_##name \
234 			__attribute__((weak));		 \
235 		machine_id == &mach_##name; \
236 	})
237 
238 extern void probe_machine(void);
239 
240 #ifdef CONFIG_PPC_PMAC
241 /*
242  * Power macintoshes have either a CUDA, PMU or SMU controlling
243  * system reset, power, NVRAM, RTC.
244  */
245 typedef enum sys_ctrler_kind {
246 	SYS_CTRLER_UNKNOWN = 0,
247 	SYS_CTRLER_CUDA = 1,
248 	SYS_CTRLER_PMU = 2,
249 	SYS_CTRLER_SMU = 3,
250 } sys_ctrler_t;
251 extern sys_ctrler_t sys_ctrler;
252 
253 #endif /* CONFIG_PPC_PMAC */
254 
log_error(char * buf,unsigned int err_type,int fatal)255 static inline void log_error(char *buf, unsigned int err_type, int fatal)
256 {
257 	if (ppc_md.log_error)
258 		ppc_md.log_error(buf, err_type, fatal);
259 }
260 
261 #define __define_machine_initcall(mach, fn, id) \
262 	static int __init __machine_initcall_##mach##_##fn(void) { \
263 		if (machine_is(mach)) return fn(); \
264 		return 0; \
265 	} \
266 	__define_initcall(__machine_initcall_##mach##_##fn, id);
267 
268 #define machine_early_initcall(mach, fn)	__define_machine_initcall(mach, fn, early)
269 #define machine_core_initcall(mach, fn)		__define_machine_initcall(mach, fn, 1)
270 #define machine_core_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 1s)
271 #define machine_postcore_initcall(mach, fn)	__define_machine_initcall(mach, fn, 2)
272 #define machine_postcore_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 2s)
273 #define machine_arch_initcall(mach, fn)		__define_machine_initcall(mach, fn, 3)
274 #define machine_arch_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 3s)
275 #define machine_subsys_initcall(mach, fn)	__define_machine_initcall(mach, fn, 4)
276 #define machine_subsys_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 4s)
277 #define machine_fs_initcall(mach, fn)		__define_machine_initcall(mach, fn, 5)
278 #define machine_fs_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 5s)
279 #define machine_rootfs_initcall(mach, fn)	__define_machine_initcall(mach, fn, rootfs)
280 #define machine_device_initcall(mach, fn)	__define_machine_initcall(mach, fn, 6)
281 #define machine_device_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 6s)
282 #define machine_late_initcall(mach, fn)		__define_machine_initcall(mach, fn, 7)
283 #define machine_late_initcall_sync(mach, fn)	__define_machine_initcall(mach, fn, 7s)
284 
285 #endif /* __KERNEL__ */
286 #endif /* _ASM_POWERPC_MACHDEP_H */
287