1 /*
2  * Read/Write Loongson Extension Registers
3  */
4 
5 #ifndef _LOONGSON_REGS_H_
6 #define _LOONGSON_REGS_H_
7 
8 #include <linux/types.h>
9 #include <linux/bits.h>
10 
11 #include <asm/mipsregs.h>
12 #include <asm/cpu.h>
13 
14 static inline bool cpu_has_cfg(void)
15 {
16 	return ((read_c0_prid() & PRID_IMP_MASK) == PRID_IMP_LOONGSON_64G);
17 }
18 
19 static inline u32 read_cpucfg(u32 reg)
20 {
21 	u32 __res;
22 
23 	__asm__ __volatile__(
24 		"parse_r __res,%0\n\t"
25 		"parse_r reg,%1\n\t"
26 		".insn \n\t"
27 		".word (0xc8080118 | (reg << 21) | (__res << 11))\n\t"
28 		:"=r"(__res)
29 		:"r"(reg)
30 		:
31 		);
32 	return __res;
33 }
34 
35 /* Bit Domains for CFG registers */
36 #define LOONGSON_CFG0	0x0
37 #define LOONGSON_CFG0_PRID GENMASK(31, 0)
38 
39 #define LOONGSON_CFG1 0x1
40 #define LOONGSON_CFG1_FP	BIT(0)
41 #define LOONGSON_CFG1_FPREV	GENMASK(3, 1)
42 #define LOONGSON_CFG1_MMI	BIT(4)
43 #define LOONGSON_CFG1_MSA1	BIT(5)
44 #define LOONGSON_CFG1_MSA2	BIT(6)
45 #define LOONGSON_CFG1_CGP	BIT(7)
46 #define LOONGSON_CFG1_WRP	BIT(8)
47 #define LOONGSON_CFG1_LSX1	BIT(9)
48 #define LOONGSON_CFG1_LSX2	BIT(10)
49 #define LOONGSON_CFG1_LASX	BIT(11)
50 #define LOONGSON_CFG1_R6FXP	BIT(12)
51 #define LOONGSON_CFG1_R6CRCP	BIT(13)
52 #define LOONGSON_CFG1_R6FPP	BIT(14)
53 #define LOONGSON_CFG1_CNT64	BIT(15)
54 #define LOONGSON_CFG1_LSLDR0	BIT(16)
55 #define LOONGSON_CFG1_LSPREF	BIT(17)
56 #define LOONGSON_CFG1_LSPREFX	BIT(18)
57 #define LOONGSON_CFG1_LSSYNCI	BIT(19)
58 #define LOONGSON_CFG1_LSUCA	BIT(20)
59 #define LOONGSON_CFG1_LLSYNC	BIT(21)
60 #define LOONGSON_CFG1_TGTSYNC	BIT(22)
61 #define LOONGSON_CFG1_LLEXC	BIT(23)
62 #define LOONGSON_CFG1_SCRAND	BIT(24)
63 #define LOONGSON_CFG1_MUALP	BIT(25)
64 #define LOONGSON_CFG1_KMUALEN	BIT(26)
65 #define LOONGSON_CFG1_ITLBT	BIT(27)
66 #define LOONGSON_CFG1_LSUPERF	BIT(28)
67 #define LOONGSON_CFG1_SFBP	BIT(29)
68 #define LOONGSON_CFG1_CDMAP	BIT(30)
69 
70 #define LOONGSON_CFG1_FPREV_OFFSET	1
71 
72 #define LOONGSON_CFG2 0x2
73 #define LOONGSON_CFG2_LEXT1	BIT(0)
74 #define LOONGSON_CFG2_LEXT2	BIT(1)
75 #define LOONGSON_CFG2_LEXT3	BIT(2)
76 #define LOONGSON_CFG2_LSPW	BIT(3)
77 #define LOONGSON_CFG2_LBT1	BIT(4)
78 #define LOONGSON_CFG2_LBT2	BIT(5)
79 #define LOONGSON_CFG2_LBT3	BIT(6)
80 #define LOONGSON_CFG2_LBTMMU	BIT(7)
81 #define LOONGSON_CFG2_LPMP	BIT(8)
82 #define LOONGSON_CFG2_LPMREV	GENMASK(11, 9)
83 #define LOONGSON_CFG2_LAMO	BIT(12)
84 #define LOONGSON_CFG2_LPIXU	BIT(13)
85 #define LOONGSON_CFG2_LPIXNU	BIT(14)
86 #define LOONGSON_CFG2_LVZP	BIT(15)
87 #define LOONGSON_CFG2_LVZREV	GENMASK(18, 16)
88 #define LOONGSON_CFG2_LGFTP	BIT(19)
89 #define LOONGSON_CFG2_LGFTPREV	GENMASK(22, 20)
90 #define LOONGSON_CFG2_LLFTP	BIT(23)
91 #define LOONGSON_CFG2_LLFTPREV	GENMASK(26, 24)
92 #define LOONGSON_CFG2_LCSRP	BIT(27)
93 #define LOONGSON_CFG2_LDISBLIKELY	BIT(28)
94 
95 #define LOONGSON_CFG2_LPMREV_OFFSET	9
96 #define LOONGSON_CFG2_LPM_REV1		(1 << LOONGSON_CFG2_LPMREV_OFFSET)
97 #define LOONGSON_CFG2_LPM_REV2		(2 << LOONGSON_CFG2_LPMREV_OFFSET)
98 #define LOONGSON_CFG2_LVZREV_OFFSET	16
99 #define LOONGSON_CFG2_LVZ_REV1		(1 << LOONGSON_CFG2_LVZREV_OFFSET)
100 #define LOONGSON_CFG2_LVZ_REV2		(2 << LOONGSON_CFG2_LVZREV_OFFSET)
101 
102 #define LOONGSON_CFG3 0x3
103 #define LOONGSON_CFG3_LCAMP	BIT(0)
104 #define LOONGSON_CFG3_LCAMREV	GENMASK(3, 1)
105 #define LOONGSON_CFG3_LCAMNUM	GENMASK(11, 4)
106 #define LOONGSON_CFG3_LCAMKW	GENMASK(19, 12)
107 #define LOONGSON_CFG3_LCAMVW	GENMASK(27, 20)
108 
109 #define LOONGSON_CFG3_LCAMREV_OFFSET	1
110 #define LOONGSON_CFG3_LCAM_REV1		(1 << LOONGSON_CFG3_LCAMREV_OFFSET)
111 #define LOONGSON_CFG3_LCAM_REV2		(2 << LOONGSON_CFG3_LCAMREV_OFFSET)
112 #define LOONGSON_CFG3_LCAMNUM_OFFSET	4
113 #define LOONGSON_CFG3_LCAMNUM_REV1	(0x3f << LOONGSON_CFG3_LCAMNUM_OFFSET)
114 #define LOONGSON_CFG3_LCAMKW_OFFSET	12
115 #define LOONGSON_CFG3_LCAMKW_REV1	(0x27 << LOONGSON_CFG3_LCAMKW_OFFSET)
116 #define LOONGSON_CFG3_LCAMVW_OFFSET	20
117 #define LOONGSON_CFG3_LCAMVW_REV1	(0x3f << LOONGSON_CFG3_LCAMVW_OFFSET)
118 
119 #define LOONGSON_CFG4 0x4
120 #define LOONGSON_CFG4_CCFREQ	GENMASK(31, 0)
121 
122 #define LOONGSON_CFG5 0x5
123 #define LOONGSON_CFG5_CFM	GENMASK(15, 0)
124 #define LOONGSON_CFG5_CFD	GENMASK(31, 16)
125 
126 #define LOONGSON_CFG6 0x6
127 
128 #define LOONGSON_CFG7 0x7
129 #define LOONGSON_CFG7_GCCAEQRP	BIT(0)
130 #define LOONGSON_CFG7_UCAWINP	BIT(1)
131 
132 static inline bool cpu_has_csr(void)
133 {
134 	if (cpu_has_cfg())
135 		return (read_cpucfg(LOONGSON_CFG2) & LOONGSON_CFG2_LCSRP);
136 
137 	return false;
138 }
139 
140 static inline u32 csr_readl(u32 reg)
141 {
142 	u32 __res;
143 
144 	/* RDCSR reg, val */
145 	__asm__ __volatile__(
146 		"parse_r __res,%0\n\t"
147 		"parse_r reg,%1\n\t"
148 		".insn \n\t"
149 		".word (0xc8000118 | (reg << 21) | (__res << 11))\n\t"
150 		:"=r"(__res)
151 		:"r"(reg)
152 		:
153 		);
154 	return __res;
155 }
156 
157 static inline u64 csr_readq(u32 reg)
158 {
159 	u64 __res;
160 
161 	/* DRDCSR reg, val */
162 	__asm__ __volatile__(
163 		"parse_r __res,%0\n\t"
164 		"parse_r reg,%1\n\t"
165 		".insn \n\t"
166 		".word (0xc8020118 | (reg << 21) | (__res << 11))\n\t"
167 		:"=r"(__res)
168 		:"r"(reg)
169 		:
170 		);
171 	return __res;
172 }
173 
174 static inline void csr_writel(u32 val, u32 reg)
175 {
176 	/* WRCSR reg, val */
177 	__asm__ __volatile__(
178 		"parse_r reg,%0\n\t"
179 		"parse_r val,%1\n\t"
180 		".insn \n\t"
181 		".word (0xc8010118 | (reg << 21) | (val << 11))\n\t"
182 		:
183 		:"r"(reg),"r"(val)
184 		:
185 		);
186 }
187 
188 static inline void csr_writeq(u64 val, u32 reg)
189 {
190 	/* DWRCSR reg, val */
191 	__asm__ __volatile__(
192 		"parse_r reg,%0\n\t"
193 		"parse_r val,%1\n\t"
194 		".insn \n\t"
195 		".word (0xc8030118 | (reg << 21) | (val << 11))\n\t"
196 		:
197 		:"r"(reg),"r"(val)
198 		:
199 		);
200 }
201 
202 /* Public CSR Register can also be accessed with regular addresses */
203 #define CSR_PUBLIC_MMIO_BASE 0x1fe00000
204 
205 #define MMIO_CSR(x)		(void *)TO_UNCAC(CSR_PUBLIC_MMIO_BASE + x)
206 
207 #define LOONGSON_CSR_FEATURES	0x8
208 #define LOONGSON_CSRF_TEMP	BIT(0)
209 #define LOONGSON_CSRF_NODECNT	BIT(1)
210 #define LOONGSON_CSRF_MSI	BIT(2)
211 #define LOONGSON_CSRF_EXTIOI	BIT(3)
212 #define LOONGSON_CSRF_IPI	BIT(4)
213 #define LOONGSON_CSRF_FREQ	BIT(5)
214 
215 #define LOONGSON_CSR_VENDOR	0x10 /* Vendor name string, should be "Loongson" */
216 #define LOONGSON_CSR_CPUNAME	0x20 /* Processor name string */
217 #define LOONGSON_CSR_NODECNT	0x408
218 #define LOONGSON_CSR_CPUTEMP	0x428
219 
220 /* PerCore CSR, only accessable by local cores */
221 #define LOONGSON_CSR_IPI_STATUS	0x1000
222 #define LOONGSON_CSR_IPI_EN	0x1004
223 #define LOONGSON_CSR_IPI_SET	0x1008
224 #define LOONGSON_CSR_IPI_CLEAR	0x100c
225 #define LOONGSON_CSR_IPI_SEND	0x1040
226 #define CSR_IPI_SEND_IP_SHIFT	0
227 #define CSR_IPI_SEND_CPU_SHIFT	16
228 #define CSR_IPI_SEND_BLOCK	BIT(31)
229 
230 static inline u64 drdtime(void)
231 {
232 	int rID = 0;
233 	u64 val = 0;
234 
235 	__asm__ __volatile__(
236 		"parse_r rID,%0\n\t"
237 		"parse_r val,%1\n\t"
238 		".insn \n\t"
239 		".word (0xc8090118 | (rID << 21) | (val << 11))\n\t"
240 		:"=r"(rID),"=r"(val)
241 		:
242 		);
243 	return val;
244 }
245 
246 #endif
247