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 #if XCHAL_HAVE_LOOPS
67 			      "wsr	a2, lcount\n\t"
68 #endif
69 			      "movi	a2, 0x1f\n\t"
70 			      "wsr	a2, ps\n\t"
71 			      "isync\n\t"
72 			      "jx	%0\n\t"
73 			      :
74 			      : "a" (XCHAL_RESET_VECTOR_VADDR)
75 			      : "a2"
76 			      );
77 
78 	/* control never gets here */
79 }
80 
81 void __init platform_setup(char **cmdline)
82 {
83 }
84 
85 #ifdef CONFIG_OF
86 
87 static void __init update_clock_frequency(struct device_node *node)
88 {
89 	struct property *newfreq;
90 	u32 freq;
91 
92 	if (!of_property_read_u32(node, "clock-frequency", &freq) && freq != 0)
93 		return;
94 
95 	newfreq = kzalloc(sizeof(*newfreq) + sizeof(u32), GFP_KERNEL);
96 	if (!newfreq)
97 		return;
98 	newfreq->value = newfreq + 1;
99 	newfreq->length = sizeof(freq);
100 	newfreq->name = kstrdup("clock-frequency", GFP_KERNEL);
101 	if (!newfreq->name) {
102 		kfree(newfreq);
103 		return;
104 	}
105 
106 	*(u32 *)newfreq->value = cpu_to_be32(*(u32 *)XTFPGA_CLKFRQ_VADDR);
107 	of_update_property(node, newfreq);
108 }
109 
110 #define MAC_LEN 6
111 static void __init update_local_mac(struct device_node *node)
112 {
113 	struct property *newmac;
114 	const u8* macaddr;
115 	int prop_len;
116 
117 	macaddr = of_get_property(node, "local-mac-address", &prop_len);
118 	if (macaddr == NULL || prop_len != MAC_LEN)
119 		return;
120 
121 	newmac = kzalloc(sizeof(*newmac) + MAC_LEN, GFP_KERNEL);
122 	if (newmac == NULL)
123 		return;
124 
125 	newmac->value = newmac + 1;
126 	newmac->length = MAC_LEN;
127 	newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
128 	if (newmac->name == NULL) {
129 		kfree(newmac);
130 		return;
131 	}
132 
133 	memcpy(newmac->value, macaddr, MAC_LEN);
134 	((u8*)newmac->value)[5] = (*(u32*)DIP_SWITCHES_VADDR) & 0x3f;
135 	of_update_property(node, newmac);
136 }
137 
138 static int __init machine_setup(void)
139 {
140 	struct device_node *clock;
141 	struct device_node *eth = NULL;
142 
143 	for_each_node_by_name(clock, "main-oscillator")
144 		update_clock_frequency(clock);
145 
146 	if ((eth = of_find_compatible_node(eth, NULL, "opencores,ethoc")))
147 		update_local_mac(eth);
148 	return 0;
149 }
150 arch_initcall(machine_setup);
151 
152 #endif
153 
154 /* early initialization */
155 
156 void __init platform_init(bp_tag_t *first)
157 {
158 }
159 
160 /* Heartbeat. */
161 
162 void platform_heartbeat(void)
163 {
164 }
165 
166 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
167 
168 void __init platform_calibrate_ccount(void)
169 {
170 	long clk_freq = 0;
171 #ifdef CONFIG_OF
172 	struct device_node *cpu =
173 		of_find_compatible_node(NULL, NULL, "cdns,xtensa-cpu");
174 	if (cpu) {
175 		u32 freq;
176 		update_clock_frequency(cpu);
177 		if (!of_property_read_u32(cpu, "clock-frequency", &freq))
178 			clk_freq = freq;
179 	}
180 #endif
181 	if (!clk_freq)
182 		clk_freq = *(long *)XTFPGA_CLKFRQ_VADDR;
183 
184 	ccount_freq = clk_freq;
185 }
186 
187 #endif
188 
189 #ifndef CONFIG_OF
190 
191 #include <linux/serial_8250.h>
192 #include <linux/if.h>
193 #include <net/ethoc.h>
194 #include <linux/usb/c67x00.h>
195 
196 /*----------------------------------------------------------------------------
197  *  Ethernet -- OpenCores Ethernet MAC (ethoc driver)
198  */
199 
200 static struct resource ethoc_res[] = {
201 	[0] = { /* register space */
202 		.start = OETH_REGS_PADDR,
203 		.end   = OETH_REGS_PADDR + OETH_REGS_SIZE - 1,
204 		.flags = IORESOURCE_MEM,
205 	},
206 	[1] = { /* buffer space */
207 		.start = OETH_SRAMBUFF_PADDR,
208 		.end   = OETH_SRAMBUFF_PADDR + OETH_SRAMBUFF_SIZE - 1,
209 		.flags = IORESOURCE_MEM,
210 	},
211 	[2] = { /* IRQ number */
212 		.start = OETH_IRQ,
213 		.end   = OETH_IRQ,
214 		.flags = IORESOURCE_IRQ,
215 	},
216 };
217 
218 static struct ethoc_platform_data ethoc_pdata = {
219 	/*
220 	 * The MAC address for these boards is 00:50:c2:13:6f:xx.
221 	 * The last byte (here as zero) is read from the DIP switches on the
222 	 * board.
223 	 */
224 	.hwaddr = { 0x00, 0x50, 0xc2, 0x13, 0x6f, 0 },
225 	.phy_id = -1,
226 };
227 
228 static struct platform_device ethoc_device = {
229 	.name = "ethoc",
230 	.id = -1,
231 	.num_resources = ARRAY_SIZE(ethoc_res),
232 	.resource = ethoc_res,
233 	.dev = {
234 		.platform_data = &ethoc_pdata,
235 	},
236 };
237 
238 /*----------------------------------------------------------------------------
239  *  USB Host/Device -- Cypress CY7C67300
240  */
241 
242 static struct resource c67x00_res[] = {
243 	[0] = { /* register space */
244 		.start = C67X00_PADDR,
245 		.end   = C67X00_PADDR + C67X00_SIZE - 1,
246 		.flags = IORESOURCE_MEM,
247 	},
248 	[1] = { /* IRQ number */
249 		.start = C67X00_IRQ,
250 		.end   = C67X00_IRQ,
251 		.flags = IORESOURCE_IRQ,
252 	},
253 };
254 
255 static struct c67x00_platform_data c67x00_pdata = {
256 	.sie_config = C67X00_SIE1_HOST | C67X00_SIE2_UNUSED,
257 	.hpi_regstep = 4,
258 };
259 
260 static struct platform_device c67x00_device = {
261 	.name = "c67x00",
262 	.id = -1,
263 	.num_resources = ARRAY_SIZE(c67x00_res),
264 	.resource = c67x00_res,
265 	.dev = {
266 		.platform_data = &c67x00_pdata,
267 	},
268 };
269 
270 /*----------------------------------------------------------------------------
271  *  UART
272  */
273 
274 static struct resource serial_resource = {
275 	.start	= DUART16552_PADDR,
276 	.end	= DUART16552_PADDR + 0x1f,
277 	.flags	= IORESOURCE_MEM,
278 };
279 
280 static struct plat_serial8250_port serial_platform_data[] = {
281 	[0] = {
282 		.mapbase	= DUART16552_PADDR,
283 		.irq		= DUART16552_INTNUM,
284 		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
285 				  UPF_IOREMAP,
286 		.iotype		= UPIO_MEM32,
287 		.regshift	= 2,
288 		.uartclk	= 0,    /* set in xtavnet_init() */
289 	},
290 	{ },
291 };
292 
293 static struct platform_device xtavnet_uart = {
294 	.name		= "serial8250",
295 	.id		= PLAT8250_DEV_PLATFORM,
296 	.dev		= {
297 		.platform_data	= serial_platform_data,
298 	},
299 	.num_resources	= 1,
300 	.resource	= &serial_resource,
301 };
302 
303 /* platform devices */
304 static struct platform_device *platform_devices[] __initdata = {
305 	&ethoc_device,
306 	&c67x00_device,
307 	&xtavnet_uart,
308 };
309 
310 
311 static int __init xtavnet_init(void)
312 {
313 	/* Ethernet MAC address.  */
314 	ethoc_pdata.hwaddr[5] = *(u32 *)DIP_SWITCHES_VADDR;
315 
316 	/* Clock rate varies among FPGA bitstreams; board specific FPGA register
317 	 * reports the actual clock rate.
318 	 */
319 	serial_platform_data[0].uartclk = *(long *)XTFPGA_CLKFRQ_VADDR;
320 
321 
322 	/* register platform devices */
323 	platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
324 
325 	/* ETHOC driver is a bit quiet; at least display Ethernet MAC, so user
326 	 * knows whether they set it correctly on the DIP switches.
327 	 */
328 	pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
329 	ethoc_pdata.eth_clkfreq = *(long *)XTFPGA_CLKFRQ_VADDR;
330 
331 	return 0;
332 }
333 
334 /*
335  * Register to be done during do_initcalls().
336  */
337 arch_initcall(xtavnet_init);
338 
339 #endif /* CONFIG_OF */
340