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Linux/arch/mips/sni/a20r.c

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  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 static u32 a20r_ack_hwint(void)
147 {
148         u32 status = read_c0_status();
149 
150         write_c0_status(status | 0x00010000);
151         asm volatile(
152         "       .set    push                    \n"
153         "       .set    noat                    \n"
154         "       .set    noreorder               \n"
155         "       lw      $1, 0(%0)               \n"
156         "       sb      $0, 0(%1)               \n"
157         "       sync                            \n"
158         "       lb      %1, 0(%1)               \n"
159         "       b       1f                      \n"
160         "       ori     %1, $1, 2               \n"
161         "       .align  8                       \n"
162         "1:                                     \n"
163         "       nop                             \n"
164         "       sw      %1, 0(%0)               \n"
165         "       sync                            \n"
166         "       li      %1, 0x20                \n"
167         "2:                                     \n"
168         "       nop                             \n"
169         "       bnez    %1,2b                   \n"
170         "       addiu   %1, -1                  \n"
171         "       sw      $1, 0(%0)               \n"
172         "       sync                            \n"
173                 ".set   pop                     \n"
174         :
175         : "Jr" (PCIMT_UCONF), "Jr" (0xbc000000));
176         write_c0_status(status);
177 
178         return status;
179 }
180 
181 static inline void unmask_a20r_irq(struct irq_data *d)
182 {
183         set_c0_status(0x100 << (d->irq - SNI_A20R_IRQ_BASE));
184         irq_enable_hazard();
185 }
186 
187 static inline void mask_a20r_irq(struct irq_data *d)
188 {
189         clear_c0_status(0x100 << (d->irq - SNI_A20R_IRQ_BASE));
190         irq_disable_hazard();
191 }
192 
193 static struct irq_chip a20r_irq_type = {
194         .name           = "A20R",
195         .irq_mask       = mask_a20r_irq,
196         .irq_unmask     = unmask_a20r_irq,
197 };
198 
199 /*
200  * hwint 0 receive all interrupts
201  */
202 static void a20r_hwint(void)
203 {
204         u32 cause, status;
205         int irq;
206 
207         clear_c0_status(IE_IRQ0);
208         status = a20r_ack_hwint();
209         cause = read_c0_cause();
210 
211         irq = ffs(((cause & status) >> 8) & 0xf8);
212         if (likely(irq > 0))
213                 do_IRQ(SNI_A20R_IRQ_BASE + irq - 1);
214         set_c0_status(IE_IRQ0);
215 }
216 
217 void __init sni_a20r_irq_init(void)
218 {
219         int i;
220 
221         for (i = SNI_A20R_IRQ_BASE + 2 ; i < SNI_A20R_IRQ_BASE + 8; i++)
222                 irq_set_chip_and_handler(i, &a20r_irq_type, handle_level_irq);
223         sni_hwint = a20r_hwint;
224         change_c0_status(ST0_IM, IE_IRQ0);
225         setup_irq(SNI_A20R_IRQ_BASE + 3, &sni_isa_irq);
226 }
227 
228 void sni_a20r_init(void)
229 {
230         /* FIXME, remove if not needed */
231 }
232 
233 static int __init snirm_a20r_setup_devinit(void)
234 {
235         switch (sni_brd_type) {
236         case SNI_BRD_TOWER_OASIC:
237         case SNI_BRD_MINITOWER:
238                 platform_device_register(&snirm_82596_pdev);
239                 platform_device_register(&snirm_53c710_pdev);
240                 platform_device_register(&sc26xx_pdev);
241                 platform_device_register(&a20r_serial8250_device);
242                 platform_device_register(&a20r_ds1216_device);
243                 sni_eisa_root_init();
244                 break;
245         }
246         return 0;
247 }
248 
249 device_initcall(snirm_a20r_setup_devinit);
250 

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