1 | /* |
2 | * A20R specific code |
3 | * |
4 | * This file is subject to the terms and conditions of the GNU General Public |
5 | * License. See the file "COPYING" in the main directory of this archive |
6 | * for more details. |
7 | * |
8 | * Copyright (C) 2006 Thomas Bogendoerfer (tsbogend@alpha.franken.de) |
9 | */ |
10 | |
11 | #include <linux/init.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/irq.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/serial_8250.h> |
16 | |
17 | #include <asm/sni.h> |
18 | #include <asm/time.h> |
19 | |
20 | #define PORT(_base,_irq) \ |
21 | { \ |
22 | .iobase = _base, \ |
23 | .irq = _irq, \ |
24 | .uartclk = 1843200, \ |
25 | .iotype = UPIO_PORT, \ |
26 | .flags = UPF_BOOT_AUTOCONF, \ |
27 | } |
28 | |
29 | static struct plat_serial8250_port a20r_data[] = { |
30 | PORT(0x3f8, 4), |
31 | PORT(0x2f8, 3), |
32 | { }, |
33 | }; |
34 | |
35 | static struct platform_device a20r_serial8250_device = { |
36 | .name = "serial8250" , |
37 | .id = PLAT8250_DEV_PLATFORM, |
38 | .dev = { |
39 | .platform_data = a20r_data, |
40 | }, |
41 | }; |
42 | |
43 | static struct resource a20r_ds1216_rsrc[] = { |
44 | { |
45 | .start = 0x1c081ffc, |
46 | .end = 0x1c081fff, |
47 | .flags = IORESOURCE_MEM |
48 | } |
49 | }; |
50 | |
51 | static struct platform_device a20r_ds1216_device = { |
52 | .name = "rtc-ds1216" , |
53 | .num_resources = ARRAY_SIZE(a20r_ds1216_rsrc), |
54 | .resource = a20r_ds1216_rsrc |
55 | }; |
56 | |
57 | static struct resource snirm_82596_rsrc[] = { |
58 | { |
59 | .start = 0x18000000, |
60 | .end = 0x18000004, |
61 | .flags = IORESOURCE_MEM |
62 | }, |
63 | { |
64 | .start = 0x18010000, |
65 | .end = 0x18010004, |
66 | .flags = IORESOURCE_MEM |
67 | }, |
68 | { |
69 | .start = 0x1ff00000, |
70 | .end = 0x1ff00020, |
71 | .flags = IORESOURCE_MEM |
72 | }, |
73 | { |
74 | .start = 22, |
75 | .end = 22, |
76 | .flags = IORESOURCE_IRQ |
77 | }, |
78 | { |
79 | .flags = 0x01 /* 16bit mpu port access */ |
80 | } |
81 | }; |
82 | |
83 | static struct platform_device snirm_82596_pdev = { |
84 | .name = "snirm_82596" , |
85 | .num_resources = ARRAY_SIZE(snirm_82596_rsrc), |
86 | .resource = snirm_82596_rsrc |
87 | }; |
88 | |
89 | static struct resource snirm_53c710_rsrc[] = { |
90 | { |
91 | .start = 0x19000000, |
92 | .end = 0x190fffff, |
93 | .flags = IORESOURCE_MEM |
94 | }, |
95 | { |
96 | .start = 19, |
97 | .end = 19, |
98 | .flags = IORESOURCE_IRQ |
99 | } |
100 | }; |
101 | |
102 | static struct platform_device snirm_53c710_pdev = { |
103 | .name = "snirm_53c710" , |
104 | .num_resources = ARRAY_SIZE(snirm_53c710_rsrc), |
105 | .resource = snirm_53c710_rsrc |
106 | }; |
107 | |
108 | static struct resource sc26xx_rsrc[] = { |
109 | { |
110 | .start = 0x1c070000, |
111 | .end = 0x1c0700ff, |
112 | .flags = IORESOURCE_MEM |
113 | }, |
114 | { |
115 | .start = 20, |
116 | .end = 20, |
117 | .flags = IORESOURCE_IRQ |
118 | } |
119 | }; |
120 | |
121 | #include <linux/platform_data/serial-sccnxp.h> |
122 | |
123 | static struct sccnxp_pdata sccnxp_data = { |
124 | .reg_shift = 2, |
125 | .mctrl_cfg[0] = MCTRL_SIG(DTR_OP, LINE_OP7) | |
126 | MCTRL_SIG(RTS_OP, LINE_OP3) | |
127 | MCTRL_SIG(DSR_IP, LINE_IP5) | |
128 | MCTRL_SIG(DCD_IP, LINE_IP6), |
129 | .mctrl_cfg[1] = MCTRL_SIG(DTR_OP, LINE_OP2) | |
130 | MCTRL_SIG(RTS_OP, LINE_OP1) | |
131 | MCTRL_SIG(DSR_IP, LINE_IP0) | |
132 | MCTRL_SIG(CTS_IP, LINE_IP1) | |
133 | MCTRL_SIG(DCD_IP, LINE_IP2) | |
134 | MCTRL_SIG(RNG_IP, LINE_IP3), |
135 | }; |
136 | |
137 | static struct platform_device sc26xx_pdev = { |
138 | .name = "sc2681" , |
139 | .resource = sc26xx_rsrc, |
140 | .num_resources = ARRAY_SIZE(sc26xx_rsrc), |
141 | .dev = { |
142 | .platform_data = &sccnxp_data, |
143 | }, |
144 | }; |
145 | |
146 | /* |
147 | * Trigger chipset to update CPU's CAUSE IP field |
148 | */ |
149 | static u32 a20r_update_cause_ip(void) |
150 | { |
151 | u32 status = read_c0_status(); |
152 | |
153 | write_c0_status(status | 0x00010000); |
154 | asm volatile( |
155 | " .set push \n" |
156 | " .set noat \n" |
157 | " .set noreorder \n" |
158 | " lw $1, 0(%0) \n" |
159 | " sb $0, 0(%1) \n" |
160 | " sync \n" |
161 | " lb %1, 0(%1) \n" |
162 | " b 1f \n" |
163 | " ori %1, $1, 2 \n" |
164 | " .align 8 \n" |
165 | "1: \n" |
166 | " nop \n" |
167 | " sw %1, 0(%0) \n" |
168 | " sync \n" |
169 | " li %1, 0x20 \n" |
170 | "2: \n" |
171 | " nop \n" |
172 | " bnez %1,2b \n" |
173 | " addiu %1, -1 \n" |
174 | " sw $1, 0(%0) \n" |
175 | " sync \n" |
176 | ".set pop \n" |
177 | : |
178 | : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000)); |
179 | write_c0_status(status); |
180 | |
181 | return status; |
182 | } |
183 | |
184 | static inline void unmask_a20r_irq(struct irq_data *d) |
185 | { |
186 | set_c0_status(0x100 << (d->irq - SNI_A20R_IRQ_BASE)); |
187 | irq_enable_hazard(); |
188 | } |
189 | |
190 | static inline void mask_a20r_irq(struct irq_data *d) |
191 | { |
192 | clear_c0_status(0x100 << (d->irq - SNI_A20R_IRQ_BASE)); |
193 | irq_disable_hazard(); |
194 | } |
195 | |
196 | static struct irq_chip a20r_irq_type = { |
197 | .name = "A20R" , |
198 | .irq_mask = mask_a20r_irq, |
199 | .irq_unmask = unmask_a20r_irq, |
200 | }; |
201 | |
202 | /* |
203 | * hwint 0 receive all interrupts |
204 | */ |
205 | static void a20r_hwint(void) |
206 | { |
207 | u32 cause, status; |
208 | int irq; |
209 | |
210 | clear_c0_status(IE_IRQ0); |
211 | status = a20r_update_cause_ip(); |
212 | cause = read_c0_cause(); |
213 | |
214 | irq = ffs(((cause & status) >> 8) & 0xf8); |
215 | if (likely(irq > 0)) |
216 | do_IRQ(SNI_A20R_IRQ_BASE + irq - 1); |
217 | |
218 | a20r_update_cause_ip(); |
219 | set_c0_status(IE_IRQ0); |
220 | } |
221 | |
222 | void __init sni_a20r_irq_init(void) |
223 | { |
224 | int i; |
225 | |
226 | for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++) |
227 | irq_set_chip_and_handler(irq: i, chip: &a20r_irq_type, handle: handle_level_irq); |
228 | sni_hwint = a20r_hwint; |
229 | change_c0_status(ST0_IM, IE_IRQ0); |
230 | if (request_irq(irq: SNI_A20R_IRQ_BASE + 3, handler: sni_isa_irq_handler, |
231 | IRQF_SHARED, name: "ISA" , dev: sni_isa_irq_handler)) |
232 | pr_err("Failed to register ISA interrupt\n" ); |
233 | } |
234 | |
235 | void sni_a20r_init(void) |
236 | { |
237 | /* FIXME, remove if not needed */ |
238 | } |
239 | |
240 | static int __init snirm_a20r_setup_devinit(void) |
241 | { |
242 | switch (sni_brd_type) { |
243 | case SNI_BRD_TOWER_OASIC: |
244 | case SNI_BRD_MINITOWER: |
245 | platform_device_register(&snirm_82596_pdev); |
246 | platform_device_register(&snirm_53c710_pdev); |
247 | platform_device_register(&sc26xx_pdev); |
248 | platform_device_register(&a20r_serial8250_device); |
249 | platform_device_register(&a20r_ds1216_device); |
250 | sni_eisa_root_init(); |
251 | break; |
252 | } |
253 | return 0; |
254 | } |
255 | |
256 | device_initcall(snirm_a20r_setup_devinit); |
257 | |