spi: mpc512x-psc: Remove redundant code to get bus_num from DT
[cascardo/linux.git] / 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 *serial;
139         struct device_node *eth = NULL;
140
141         for_each_compatible_node(serial, NULL, "ns16550a")
142                 update_clock_frequency(serial);
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
193 /*----------------------------------------------------------------------------
194  *  Ethernet -- OpenCores Ethernet MAC (ethoc driver)
195  */
196
197 static struct resource ethoc_res[] = {
198         [0] = { /* register space */
199                 .start = OETH_REGS_PADDR,
200                 .end   = OETH_REGS_PADDR + OETH_REGS_SIZE - 1,
201                 .flags = IORESOURCE_MEM,
202         },
203         [1] = { /* buffer space */
204                 .start = OETH_SRAMBUFF_PADDR,
205                 .end   = OETH_SRAMBUFF_PADDR + OETH_SRAMBUFF_SIZE - 1,
206                 .flags = IORESOURCE_MEM,
207         },
208         [2] = { /* IRQ number */
209                 .start = OETH_IRQ,
210                 .end   = OETH_IRQ,
211                 .flags = IORESOURCE_IRQ,
212         },
213 };
214
215 static struct ethoc_platform_data ethoc_pdata = {
216         /*
217          * The MAC address for these boards is 00:50:c2:13:6f:xx.
218          * The last byte (here as zero) is read from the DIP switches on the
219          * board.
220          */
221         .hwaddr = { 0x00, 0x50, 0xc2, 0x13, 0x6f, 0 },
222         .phy_id = -1,
223 };
224
225 static struct platform_device ethoc_device = {
226         .name = "ethoc",
227         .id = -1,
228         .num_resources = ARRAY_SIZE(ethoc_res),
229         .resource = ethoc_res,
230         .dev = {
231                 .platform_data = &ethoc_pdata,
232         },
233 };
234
235 /*----------------------------------------------------------------------------
236  *  UART
237  */
238
239 static struct resource serial_resource = {
240         .start  = DUART16552_PADDR,
241         .end    = DUART16552_PADDR + 0x1f,
242         .flags  = IORESOURCE_MEM,
243 };
244
245 static struct plat_serial8250_port serial_platform_data[] = {
246         [0] = {
247                 .mapbase        = DUART16552_PADDR,
248                 .irq            = DUART16552_INTNUM,
249                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
250                                   UPF_IOREMAP,
251                 .iotype         = UPIO_MEM32,
252                 .regshift       = 2,
253                 .uartclk        = 0,    /* set in xtavnet_init() */
254         },
255         { },
256 };
257
258 static struct platform_device xtavnet_uart = {
259         .name           = "serial8250",
260         .id             = PLAT8250_DEV_PLATFORM,
261         .dev            = {
262                 .platform_data  = serial_platform_data,
263         },
264         .num_resources  = 1,
265         .resource       = &serial_resource,
266 };
267
268 /* platform devices */
269 static struct platform_device *platform_devices[] __initdata = {
270         &ethoc_device,
271         &xtavnet_uart,
272 };
273
274
275 static int __init xtavnet_init(void)
276 {
277         /* Ethernet MAC address.  */
278         ethoc_pdata.hwaddr[5] = *(u32 *)DIP_SWITCHES_VADDR;
279
280         /* Clock rate varies among FPGA bitstreams; board specific FPGA register
281          * reports the actual clock rate.
282          */
283         serial_platform_data[0].uartclk = *(long *)XTFPGA_CLKFRQ_VADDR;
284
285
286         /* register platform devices */
287         platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
288
289         /* ETHOC driver is a bit quiet; at least display Ethernet MAC, so user
290          * knows whether they set it correctly on the DIP switches.
291          */
292         pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
293
294         return 0;
295 }
296
297 /*
298  * Register to be done during do_initcalls().
299  */
300 arch_initcall(xtavnet_init);
301
302 #endif /* CONFIG_OF */