1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ALPHA_LCA__H__
3 #define __ALPHA_LCA__H__
4 
5 #include <asm/compiler.h>
6 #include <asm/mce.h>
7 
8 /*
9  * Low Cost Alpha (LCA) definitions (these apply to 21066 and 21068,
10  * for example).
11  *
12  * This file is based on:
13  *
14  *	DECchip 21066 and DECchip 21068 Alpha AXP Microprocessors
15  *	Hardware Reference Manual; Digital Equipment Corp.; May 1994;
16  *	Maynard, MA; Order Number: EC-N2681-71.
17  */
18 
19 /*
20  * NOTE: The LCA uses a Host Address Extension (HAE) register to access
21  *	 PCI addresses that are beyond the first 27 bits of address
22  *	 space.  Updating the HAE requires an external cycle (and
23  *	 a memory barrier), which tends to be slow.  Instead of updating
24  *	 it on each sparse memory access, we keep the current HAE value
25  *	 cached in variable cache_hae.  Only if the cached HAE differs
26  *	 from the desired HAE value do we actually updated HAE register.
27  *	 The HAE register is preserved by the interrupt handler entry/exit
28  *	 code, so this scheme works even in the presence of interrupts.
29  *
30  * Dense memory space doesn't require the HAE, but is restricted to
31  * aligned 32 and 64 bit accesses.  Special Cycle and Interrupt
32  * Acknowledge cycles may also require the use of the HAE.  The LCA
33  * limits I/O address space to the bottom 24 bits of address space,
34  * but this easily covers the 16 bit ISA I/O address space.
35  */
36 
37 /*
38  * NOTE 2! The memory operations do not set any memory barriers, as
39  * it's not needed for cases like a frame buffer that is essentially
40  * memory-like.  You need to do them by hand if the operations depend
41  * on ordering.
42  *
43  * Similarly, the port I/O operations do a "mb" only after a write
44  * operation: if an mb is needed before (as in the case of doing
45  * memory mapped I/O first, and then a port I/O operation to the same
46  * device), it needs to be done by hand.
47  *
48  * After the above has bitten me 100 times, I'll give up and just do
49  * the mb all the time, but right now I'm hoping this will work out.
50  * Avoiding mb's may potentially be a noticeable speed improvement,
51  * but I can't honestly say I've tested it.
52  *
53  * Handling interrupts that need to do mb's to synchronize to
54  * non-interrupts is another fun race area.  Don't do it (because if
55  * you do, I'll have to do *everything* with interrupts disabled,
56  * ugh).
57  */
58 
59 /*
60  * Memory Controller registers:
61  */
62 #define LCA_MEM_BCR0		(IDENT_ADDR + 0x120000000UL)
63 #define LCA_MEM_BCR1		(IDENT_ADDR + 0x120000008UL)
64 #define LCA_MEM_BCR2		(IDENT_ADDR + 0x120000010UL)
65 #define LCA_MEM_BCR3		(IDENT_ADDR + 0x120000018UL)
66 #define LCA_MEM_BMR0		(IDENT_ADDR + 0x120000020UL)
67 #define LCA_MEM_BMR1		(IDENT_ADDR + 0x120000028UL)
68 #define LCA_MEM_BMR2		(IDENT_ADDR + 0x120000030UL)
69 #define LCA_MEM_BMR3		(IDENT_ADDR + 0x120000038UL)
70 #define LCA_MEM_BTR0		(IDENT_ADDR + 0x120000040UL)
71 #define LCA_MEM_BTR1		(IDENT_ADDR + 0x120000048UL)
72 #define LCA_MEM_BTR2		(IDENT_ADDR + 0x120000050UL)
73 #define LCA_MEM_BTR3		(IDENT_ADDR + 0x120000058UL)
74 #define LCA_MEM_GTR		(IDENT_ADDR + 0x120000060UL)
75 #define LCA_MEM_ESR		(IDENT_ADDR + 0x120000068UL)
76 #define LCA_MEM_EAR		(IDENT_ADDR + 0x120000070UL)
77 #define LCA_MEM_CAR		(IDENT_ADDR + 0x120000078UL)
78 #define LCA_MEM_VGR		(IDENT_ADDR + 0x120000080UL)
79 #define LCA_MEM_PLM		(IDENT_ADDR + 0x120000088UL)
80 #define LCA_MEM_FOR		(IDENT_ADDR + 0x120000090UL)
81 
82 /*
83  * I/O Controller registers:
84  */
85 #define LCA_IOC_HAE		(IDENT_ADDR + 0x180000000UL)
86 #define LCA_IOC_CONF		(IDENT_ADDR + 0x180000020UL)
87 #define LCA_IOC_STAT0		(IDENT_ADDR + 0x180000040UL)
88 #define LCA_IOC_STAT1		(IDENT_ADDR + 0x180000060UL)
89 #define LCA_IOC_TBIA		(IDENT_ADDR + 0x180000080UL)
90 #define LCA_IOC_TB_ENA		(IDENT_ADDR + 0x1800000a0UL)
91 #define LCA_IOC_SFT_RST		(IDENT_ADDR + 0x1800000c0UL)
92 #define LCA_IOC_PAR_DIS		(IDENT_ADDR + 0x1800000e0UL)
93 #define LCA_IOC_W_BASE0		(IDENT_ADDR + 0x180000100UL)
94 #define LCA_IOC_W_BASE1		(IDENT_ADDR + 0x180000120UL)
95 #define LCA_IOC_W_MASK0		(IDENT_ADDR + 0x180000140UL)
96 #define LCA_IOC_W_MASK1		(IDENT_ADDR + 0x180000160UL)
97 #define LCA_IOC_T_BASE0		(IDENT_ADDR + 0x180000180UL)
98 #define LCA_IOC_T_BASE1		(IDENT_ADDR + 0x1800001a0UL)
99 #define LCA_IOC_TB_TAG0		(IDENT_ADDR + 0x188000000UL)
100 #define LCA_IOC_TB_TAG1		(IDENT_ADDR + 0x188000020UL)
101 #define LCA_IOC_TB_TAG2		(IDENT_ADDR + 0x188000040UL)
102 #define LCA_IOC_TB_TAG3		(IDENT_ADDR + 0x188000060UL)
103 #define LCA_IOC_TB_TAG4		(IDENT_ADDR + 0x188000070UL)
104 #define LCA_IOC_TB_TAG5		(IDENT_ADDR + 0x1880000a0UL)
105 #define LCA_IOC_TB_TAG6		(IDENT_ADDR + 0x1880000c0UL)
106 #define LCA_IOC_TB_TAG7		(IDENT_ADDR + 0x1880000e0UL)
107 
108 /*
109  * Memory spaces:
110  */
111 #define LCA_IACK_SC		(IDENT_ADDR + 0x1a0000000UL)
112 #define LCA_CONF		(IDENT_ADDR + 0x1e0000000UL)
113 #define LCA_IO			(IDENT_ADDR + 0x1c0000000UL)
114 #define LCA_SPARSE_MEM		(IDENT_ADDR + 0x200000000UL)
115 #define LCA_DENSE_MEM		(IDENT_ADDR + 0x300000000UL)
116 
117 /*
118  * Bit definitions for I/O Controller status register 0:
119  */
120 #define LCA_IOC_STAT0_CMD		0xf
121 #define LCA_IOC_STAT0_ERR		(1<<4)
122 #define LCA_IOC_STAT0_LOST		(1<<5)
123 #define LCA_IOC_STAT0_THIT		(1<<6)
124 #define LCA_IOC_STAT0_TREF		(1<<7)
125 #define LCA_IOC_STAT0_CODE_SHIFT	8
126 #define LCA_IOC_STAT0_CODE_MASK		0x7
127 #define LCA_IOC_STAT0_P_NBR_SHIFT	13
128 #define LCA_IOC_STAT0_P_NBR_MASK	0x7ffff
129 
130 #define LCA_HAE_ADDRESS		LCA_IOC_HAE
131 
132 /* LCA PMR Power Management register defines */
133 #define LCA_PMR_ADDR	(IDENT_ADDR + 0x120000098UL)
134 #define LCA_PMR_PDIV    0x7                     /* Primary clock divisor */
135 #define LCA_PMR_ODIV    0x38                    /* Override clock divisor */
136 #define LCA_PMR_INTO    0x40                    /* Interrupt override */
137 #define LCA_PMR_DMAO    0x80                    /* DMA override */
138 #define LCA_PMR_OCCEB   0xffff0000L             /* Override cycle counter - even bits */
139 #define LCA_PMR_OCCOB   0xffff000000000000L     /* Override cycle counter - even bits */
140 #define LCA_PMR_PRIMARY_MASK    0xfffffffffffffff8L
141 
142 /* LCA PMR Macros */
143 
144 #define LCA_READ_PMR        (*(volatile unsigned long *)LCA_PMR_ADDR)
145 #define LCA_WRITE_PMR(d)    (*((volatile unsigned long *)LCA_PMR_ADDR) = (d))
146 
147 #define LCA_GET_PRIMARY(r)  ((r) & LCA_PMR_PDIV)
148 #define LCA_GET_OVERRIDE(r) (((r) >> 3) & LCA_PMR_PDIV)
149 #define LCA_SET_PRIMARY_CLOCK(r, c) ((r) = (((r) & LCA_PMR_PRIMARY_MASK)|(c)))
150 
151 /* LCA PMR Divisor values */
152 #define LCA_PMR_DIV_1   0x0
153 #define LCA_PMR_DIV_1_5 0x1
154 #define LCA_PMR_DIV_2   0x2
155 #define LCA_PMR_DIV_4   0x3
156 #define LCA_PMR_DIV_8   0x4
157 #define LCA_PMR_DIV_16  0x5
158 #define LCA_PMR_DIV_MIN DIV_1
159 #define LCA_PMR_DIV_MAX DIV_16
160 
161 
162 /*
163  * Data structure for handling LCA machine checks.  Correctable errors
164  * result in a short logout frame, uncorrectable ones in a long one.
165  */
166 struct el_lca_mcheck_short {
167 	struct el_common	h;		/* common logout header */
168 	unsigned long		esr;		/* error-status register */
169 	unsigned long		ear;		/* error-address register */
170 	unsigned long		dc_stat;	/* dcache status register */
171 	unsigned long		ioc_stat0;	/* I/O controller status register 0 */
172 	unsigned long		ioc_stat1;	/* I/O controller status register 1 */
173 };
174 
175 struct el_lca_mcheck_long {
176 	struct el_common	h;		/* common logout header */
177 	unsigned long		pt[31];		/* PAL temps */
178 	unsigned long		exc_addr;	/* exception address */
179 	unsigned long		pad1[3];
180 	unsigned long		pal_base;	/* PALcode base address */
181 	unsigned long		hier;		/* hw interrupt enable */
182 	unsigned long		hirr;		/* hw interrupt request */
183 	unsigned long		mm_csr;		/* MMU control & status */
184 	unsigned long		dc_stat;	/* data cache status */
185 	unsigned long		dc_addr;	/* data cache addr register */
186 	unsigned long		abox_ctl;	/* address box control register */
187 	unsigned long		esr;		/* error status register */
188 	unsigned long		ear;		/* error address register */
189 	unsigned long		car;		/* cache control register */
190 	unsigned long		ioc_stat0;	/* I/O controller status register 0 */
191 	unsigned long		ioc_stat1;	/* I/O controller status register 1 */
192 	unsigned long		va;		/* virtual address register */
193 };
194 
195 union el_lca {
196 	struct el_common *		c;
197 	struct el_lca_mcheck_long *	l;
198 	struct el_lca_mcheck_short *	s;
199 };
200 
201 #ifdef __KERNEL__
202 
203 #ifndef __EXTERN_INLINE
204 #define __EXTERN_INLINE extern inline
205 #define __IO_EXTERN_INLINE
206 #endif
207 
208 /*
209  * I/O functions:
210  *
211  * Unlike Jensen, the Noname machines have no concept of local
212  * I/O---everything goes over the PCI bus.
213  *
214  * There is plenty room for optimization here.  In particular,
215  * the Alpha's insb/insw/extb/extw should be useful in moving
216  * data to/from the right byte-lanes.
217  */
218 
219 #define vip	volatile int __force *
220 #define vuip	volatile unsigned int __force *
221 #define vulp	volatile unsigned long __force *
222 
223 #define LCA_SET_HAE						\
224 	do {							\
225 		if (addr >= (1UL << 24)) {			\
226 			unsigned long msb = addr & 0xf8000000;	\
227 			addr -= msb;				\
228 			set_hae(msb);				\
229 		}						\
230 	} while (0)
231 
232 
lca_ioread8(const void __iomem * xaddr)233 __EXTERN_INLINE unsigned int lca_ioread8(const void __iomem *xaddr)
234 {
235 	unsigned long addr = (unsigned long) xaddr;
236 	unsigned long result, base_and_type;
237 
238 	if (addr >= LCA_DENSE_MEM) {
239 		addr -= LCA_DENSE_MEM;
240 		LCA_SET_HAE;
241 		base_and_type = LCA_SPARSE_MEM + 0x00;
242 	} else {
243 		addr -= LCA_IO;
244 		base_and_type = LCA_IO + 0x00;
245 	}
246 
247 	result = *(vip) ((addr << 5) + base_and_type);
248 	return __kernel_extbl(result, addr & 3);
249 }
250 
lca_iowrite8(u8 b,void __iomem * xaddr)251 __EXTERN_INLINE void lca_iowrite8(u8 b, void __iomem *xaddr)
252 {
253 	unsigned long addr = (unsigned long) xaddr;
254 	unsigned long w, base_and_type;
255 
256 	if (addr >= LCA_DENSE_MEM) {
257 		addr -= LCA_DENSE_MEM;
258 		LCA_SET_HAE;
259 		base_and_type = LCA_SPARSE_MEM + 0x00;
260 	} else {
261 		addr -= LCA_IO;
262 		base_and_type = LCA_IO + 0x00;
263 	}
264 
265 	w = __kernel_insbl(b, addr & 3);
266 	*(vuip) ((addr << 5) + base_and_type) = w;
267 }
268 
lca_ioread16(const void __iomem * xaddr)269 __EXTERN_INLINE unsigned int lca_ioread16(const void __iomem *xaddr)
270 {
271 	unsigned long addr = (unsigned long) xaddr;
272 	unsigned long result, base_and_type;
273 
274 	if (addr >= LCA_DENSE_MEM) {
275 		addr -= LCA_DENSE_MEM;
276 		LCA_SET_HAE;
277 		base_and_type = LCA_SPARSE_MEM + 0x08;
278 	} else {
279 		addr -= LCA_IO;
280 		base_and_type = LCA_IO + 0x08;
281 	}
282 
283 	result = *(vip) ((addr << 5) + base_and_type);
284 	return __kernel_extwl(result, addr & 3);
285 }
286 
lca_iowrite16(u16 b,void __iomem * xaddr)287 __EXTERN_INLINE void lca_iowrite16(u16 b, void __iomem *xaddr)
288 {
289 	unsigned long addr = (unsigned long) xaddr;
290 	unsigned long w, base_and_type;
291 
292 	if (addr >= LCA_DENSE_MEM) {
293 		addr -= LCA_DENSE_MEM;
294 		LCA_SET_HAE;
295 		base_and_type = LCA_SPARSE_MEM + 0x08;
296 	} else {
297 		addr -= LCA_IO;
298 		base_and_type = LCA_IO + 0x08;
299 	}
300 
301 	w = __kernel_inswl(b, addr & 3);
302 	*(vuip) ((addr << 5) + base_and_type) = w;
303 }
304 
lca_ioread32(const void __iomem * xaddr)305 __EXTERN_INLINE unsigned int lca_ioread32(const void __iomem *xaddr)
306 {
307 	unsigned long addr = (unsigned long) xaddr;
308 	if (addr < LCA_DENSE_MEM)
309 		addr = ((addr - LCA_IO) << 5) + LCA_IO + 0x18;
310 	return *(vuip)addr;
311 }
312 
lca_iowrite32(u32 b,void __iomem * xaddr)313 __EXTERN_INLINE void lca_iowrite32(u32 b, void __iomem *xaddr)
314 {
315 	unsigned long addr = (unsigned long) xaddr;
316 	if (addr < LCA_DENSE_MEM)
317 		addr = ((addr - LCA_IO) << 5) + LCA_IO + 0x18;
318 	*(vuip)addr = b;
319 }
320 
lca_ioportmap(unsigned long addr)321 __EXTERN_INLINE void __iomem *lca_ioportmap(unsigned long addr)
322 {
323 	return (void __iomem *)(addr + LCA_IO);
324 }
325 
lca_ioremap(unsigned long addr,unsigned long size)326 __EXTERN_INLINE void __iomem *lca_ioremap(unsigned long addr,
327 					  unsigned long size)
328 {
329 	return (void __iomem *)(addr + LCA_DENSE_MEM);
330 }
331 
lca_is_ioaddr(unsigned long addr)332 __EXTERN_INLINE int lca_is_ioaddr(unsigned long addr)
333 {
334 	return addr >= IDENT_ADDR + 0x120000000UL;
335 }
336 
lca_is_mmio(const volatile void __iomem * addr)337 __EXTERN_INLINE int lca_is_mmio(const volatile void __iomem *addr)
338 {
339 	return (unsigned long)addr >= LCA_DENSE_MEM;
340 }
341 
342 #undef vip
343 #undef vuip
344 #undef vulp
345 
346 #undef __IO_PREFIX
347 #define __IO_PREFIX		lca
348 #define lca_trivial_rw_bw	2
349 #define lca_trivial_rw_lq	1
350 #define lca_trivial_io_bw	0
351 #define lca_trivial_io_lq	0
352 #define lca_trivial_iounmap	1
353 #include <asm/io_trivial.h>
354 
355 #ifdef __IO_EXTERN_INLINE
356 #undef __EXTERN_INLINE
357 #undef __IO_EXTERN_INLINE
358 #endif
359 
360 #endif /* __KERNEL__ */
361 
362 #endif /* __ALPHA_LCA__H__ */
363