Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / arch / xtensa / platforms / xtfpga / setup.c
1 /*
2  *
3  * arch/xtensa/platform/xtavnet/setup.c
4  *
5  * ...
6  *
7  * Authors:     Chris Zankel <chris@zankel.net>
8  *              Joe Taylor <joe@tensilica.com>
9  *
10  * Copyright 2001 - 2006 Tensilica Inc.
11  *
12  * This program is free software; you can redistribute  it and/or modify it
13  * under  the terms of  the GNU General  Public License as published by the
14  * Free Software Foundation;  either version 2 of the  License, or (at your
15  * option) any later version.
16  *
17  */
18 #include <linux/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/reboot.h>
23 #include <linux/kdev_t.h>
24 #include <linux/types.h>
25 #include <linux/major.h>
26 #include <linux/console.h>
27 #include <linux/delay.h>
28 #include <linux/of.h>
29
30 #include <asm/timex.h>
31 #include <asm/processor.h>
32 #include <asm/platform.h>
33 #include <asm/bootparam.h>
34 #include <platform/lcd.h>
35 #include <platform/hardware.h>
36
37 void platform_halt(void)
38 {
39         lcd_disp_at_pos(" HALT ", 0);
40         local_irq_disable();
41         while (1)
42                 cpu_relax();
43 }
44
45 void platform_power_off(void)
46 {
47         lcd_disp_at_pos("POWEROFF", 0);
48         local_irq_disable();
49         while (1)
50                 cpu_relax();
51 }
52
53 void platform_restart(void)
54 {
55         /* Flush and reset the mmu, simulate a processor reset, and
56          * jump to the reset vector. */
57
58
59         __asm__ __volatile__ ("movi     a2, 15\n\t"
60                               "wsr      a2, icountlevel\n\t"
61                               "movi     a2, 0\n\t"
62                               "wsr      a2, icount\n\t"
63 #if XCHAL_NUM_IBREAK > 0
64                               "wsr      a2, ibreakenable\n\t"
65 #endif
66                               "wsr      a2, lcount\n\t"
67                               "movi     a2, 0x1f\n\t"
68                               "wsr      a2, ps\n\t"
69                               "isync\n\t"
70                               "jx       %0\n\t"
71                               :
72                               : "a" (XCHAL_RESET_VECTOR_VADDR)
73                               : "a2"
74                               );
75
76         /* control never gets here */
77 }
78
79 void __init platform_setup(char **cmdline)
80 {
81 }
82
83 #ifdef CONFIG_OF
84
85 static void __init update_clock_frequency(struct device_node *node)
86 {
87         struct property *newfreq;
88         u32 freq;
89
90         if (!of_property_read_u32(node, "clock-frequency", &freq) && freq != 0)
91                 return;
92
93         newfreq = kzalloc(sizeof(*newfreq) + sizeof(u32), GFP_KERNEL);
94         if (!newfreq)
95                 return;
96         newfreq->value = newfreq + 1;
97         newfreq->length = sizeof(freq);
98         newfreq->name = kstrdup("clock-frequency", GFP_KERNEL);
99         if (!newfreq->name) {
100                 kfree(newfreq);
101                 return;
102         }
103
104         *(u32 *)newfreq->value = cpu_to_be32(*(u32 *)XTFPGA_CLKFRQ_VADDR);
105         of_update_property(node, newfreq);
106 }
107
108 #define MAC_LEN 6
109 static void __init update_local_mac(struct device_node *node)
110 {
111         struct property *newmac;
112         const u8* macaddr;
113         int prop_len;
114
115         macaddr = of_get_property(node, "local-mac-address", &prop_len);
116         if (macaddr == NULL || prop_len != MAC_LEN)
117                 return;
118
119         newmac = kzalloc(sizeof(*newmac) + MAC_LEN, GFP_KERNEL);
120         if (newmac == NULL)
121                 return;
122
123         newmac->value = newmac + 1;
124         newmac->length = MAC_LEN;
125         newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
126         if (newmac->name == NULL) {
127                 kfree(newmac);
128                 return;
129         }
130
131         memcpy(newmac->value, macaddr, MAC_LEN);
132         ((u8*)newmac->value)[5] = (*(u32*)DIP_SWITCHES_VADDR) & 0x3f;
133         of_update_property(node, newmac);
134 }
135
136 static int __init machine_setup(void)
137 {
138         struct device_node *clock;
139         struct device_node *eth = NULL;
140
141         for_each_node_by_name(clock, "main-oscillator")
142                 update_clock_frequency(clock);
143
144         if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
145                 update_local_mac(eth);
146         return 0;
147 }
148 arch_initcall(machine_setup);
149
150 #endif
151
152 /* early initialization */
153
154 void __init platform_init(bp_tag_t *first)
155 {
156 }
157
158 /* Heartbeat. */
159
160 void platform_heartbeat(void)
161 {
162 }
163
164 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
165
166 void __init platform_calibrate_ccount(void)
167 {
168         long clk_freq = 0;
169 #ifdef CONFIG_OF
170         struct device_node *cpu =
171                 of_find_compatible_node(NULL, NULL, "cdns,xtensa-cpu");
172         if (cpu) {
173                 u32 freq;
174                 update_clock_frequency(cpu);
175                 if (!of_property_read_u32(cpu, "clock-frequency", &freq))
176                         clk_freq = freq;
177         }
178 #endif
179         if (!clk_freq)
180                 clk_freq = *(long *)XTFPGA_CLKFRQ_VADDR;
181
182         ccount_freq = clk_freq;
183 }
184
185 #endif
186
187 #ifndef CONFIG_OF
188
189 #include <linux/serial_8250.h>
190 #include <linux/if.h>
191 #include <net/ethoc.h>
192 #include <linux/usb/c67x00.h>
193
194 /*----------------------------------------------------------------------------
195  *  Ethernet -- OpenCores Ethernet MAC (ethoc driver)
196  */
197
198 static struct resource ethoc_res[] = {
199         [0] = { /* register space */
200                 .start = OETH_REGS_PADDR,
201                 .end   = OETH_REGS_PADDR + OETH_REGS_SIZE - 1,
202                 .flags = IORESOURCE_MEM,
203         },
204         [1] = { /* buffer space */
205                 .start = OETH_SRAMBUFF_PADDR,
206                 .end   = OETH_SRAMBUFF_PADDR + OETH_SRAMBUFF_SIZE - 1,
207                 .flags = IORESOURCE_MEM,
208         },
209         [2] = { /* IRQ number */
210                 .start = OETH_IRQ,
211                 .end   = OETH_IRQ,
212                 .flags = IORESOURCE_IRQ,
213         },
214 };
215
216 static struct ethoc_platform_data ethoc_pdata = {
217         /*
218          * The MAC address for these boards is 00:50:c2:13:6f:xx.
219          * The last byte (here as zero) is read from the DIP switches on the
220          * board.
221          */
222         .hwaddr = { 0x00, 0x50, 0xc2, 0x13, 0x6f, 0 },
223         .phy_id = -1,
224 };
225
226 static struct platform_device ethoc_device = {
227         .name = "ethoc",
228         .id = -1,
229         .num_resources = ARRAY_SIZE(ethoc_res),
230         .resource = ethoc_res,
231         .dev = {
232                 .platform_data = &ethoc_pdata,
233         },
234 };
235
236 /*----------------------------------------------------------------------------
237  *  USB Host/Device -- Cypress CY7C67300
238  */
239
240 static struct resource c67x00_res[] = {
241         [0] = { /* register space */
242                 .start = C67X00_PADDR,
243                 .end   = C67X00_PADDR + C67X00_SIZE - 1,
244                 .flags = IORESOURCE_MEM,
245         },
246         [1] = { /* IRQ number */
247                 .start = C67X00_IRQ,
248                 .end   = C67X00_IRQ,
249                 .flags = IORESOURCE_IRQ,
250         },
251 };
252
253 static struct c67x00_platform_data c67x00_pdata = {
254         .sie_config = C67X00_SIE1_HOST | C67X00_SIE2_UNUSED,
255         .hpi_regstep = 4,
256 };
257
258 static struct platform_device c67x00_device = {
259         .name = "c67x00",
260         .id = -1,
261         .num_resources = ARRAY_SIZE(c67x00_res),
262         .resource = c67x00_res,
263         .dev = {
264                 .platform_data = &c67x00_pdata,
265         },
266 };
267
268 /*----------------------------------------------------------------------------
269  *  UART
270  */
271
272 static struct resource serial_resource = {
273         .start  = DUART16552_PADDR,
274         .end    = DUART16552_PADDR + 0x1f,
275         .flags  = IORESOURCE_MEM,
276 };
277
278 static struct plat_serial8250_port serial_platform_data[] = {
279         [0] = {
280                 .mapbase        = DUART16552_PADDR,
281                 .irq            = DUART16552_INTNUM,
282                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
283                                   UPF_IOREMAP,
284                 .iotype         = UPIO_MEM32,
285                 .regshift       = 2,
286                 .uartclk        = 0,    /* set in xtavnet_init() */
287         },
288         { },
289 };
290
291 static struct platform_device xtavnet_uart = {
292         .name           = "serial8250",
293         .id             = PLAT8250_DEV_PLATFORM,
294         .dev            = {
295                 .platform_data  = serial_platform_data,
296         },
297         .num_resources  = 1,
298         .resource       = &serial_resource,
299 };
300
301 /* platform devices */
302 static struct platform_device *platform_devices[] __initdata = {
303         &ethoc_device,
304         &c67x00_device,
305         &xtavnet_uart,
306 };
307
308
309 static int __init xtavnet_init(void)
310 {
311         /* Ethernet MAC address.  */
312         ethoc_pdata.hwaddr[5] = *(u32 *)DIP_SWITCHES_VADDR;
313
314         /* Clock rate varies among FPGA bitstreams; board specific FPGA register
315          * reports the actual clock rate.
316          */
317         serial_platform_data[0].uartclk = *(long *)XTFPGA_CLKFRQ_VADDR;
318
319
320         /* register platform devices */
321         platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
322
323         /* ETHOC driver is a bit quiet; at least display Ethernet MAC, so user
324          * knows whether they set it correctly on the DIP switches.
325          */
326         pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
327         ethoc_pdata.eth_clkfreq = *(long *)XTFPGA_CLKFRQ_VADDR;
328
329         return 0;
330 }
331
332 /*
333  * Register to be done during do_initcalls().
334  */
335 arch_initcall(xtavnet_init);
336
337 #endif /* CONFIG_OF */