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Linux/arch/xtensa/platforms/xtfpga/setup.c

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  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         .big_endian = XCHAL_HAVE_BE,
227 };
228 
229 static struct platform_device ethoc_device = {
230         .name = "ethoc",
231         .id = -1,
232         .num_resources = ARRAY_SIZE(ethoc_res),
233         .resource = ethoc_res,
234         .dev = {
235                 .platform_data = &ethoc_pdata,
236         },
237 };
238 
239 /*----------------------------------------------------------------------------
240  *  USB Host/Device -- Cypress CY7C67300
241  */
242 
243 static struct resource c67x00_res[] = {
244         [0] = { /* register space */
245                 .start = C67X00_PADDR,
246                 .end   = C67X00_PADDR + C67X00_SIZE - 1,
247                 .flags = IORESOURCE_MEM,
248         },
249         [1] = { /* IRQ number */
250                 .start = C67X00_IRQ,
251                 .end   = C67X00_IRQ,
252                 .flags = IORESOURCE_IRQ,
253         },
254 };
255 
256 static struct c67x00_platform_data c67x00_pdata = {
257         .sie_config = C67X00_SIE1_HOST | C67X00_SIE2_UNUSED,
258         .hpi_regstep = 4,
259 };
260 
261 static struct platform_device c67x00_device = {
262         .name = "c67x00",
263         .id = -1,
264         .num_resources = ARRAY_SIZE(c67x00_res),
265         .resource = c67x00_res,
266         .dev = {
267                 .platform_data = &c67x00_pdata,
268         },
269 };
270 
271 /*----------------------------------------------------------------------------
272  *  UART
273  */
274 
275 static struct resource serial_resource = {
276         .start  = DUART16552_PADDR,
277         .end    = DUART16552_PADDR + 0x1f,
278         .flags  = IORESOURCE_MEM,
279 };
280 
281 static struct plat_serial8250_port serial_platform_data[] = {
282         [0] = {
283                 .mapbase        = DUART16552_PADDR,
284                 .irq            = DUART16552_INTNUM,
285                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
286                                   UPF_IOREMAP,
287                 .iotype         = XCHAL_HAVE_BE ? UPIO_MEM32BE : UPIO_MEM32,
288                 .regshift       = 2,
289                 .uartclk        = 0,    /* set in xtavnet_init() */
290         },
291         { },
292 };
293 
294 static struct platform_device xtavnet_uart = {
295         .name           = "serial8250",
296         .id             = PLAT8250_DEV_PLATFORM,
297         .dev            = {
298                 .platform_data  = serial_platform_data,
299         },
300         .num_resources  = 1,
301         .resource       = &serial_resource,
302 };
303 
304 /* platform devices */
305 static struct platform_device *platform_devices[] __initdata = {
306         &ethoc_device,
307         &c67x00_device,
308         &xtavnet_uart,
309 };
310 
311 
312 static int __init xtavnet_init(void)
313 {
314         /* Ethernet MAC address.  */
315         ethoc_pdata.hwaddr[5] = *(u32 *)DIP_SWITCHES_VADDR;
316 
317         /* Clock rate varies among FPGA bitstreams; board specific FPGA register
318          * reports the actual clock rate.
319          */
320         serial_platform_data[0].uartclk = *(long *)XTFPGA_CLKFRQ_VADDR;
321 
322 
323         /* register platform devices */
324         platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
325 
326         /* ETHOC driver is a bit quiet; at least display Ethernet MAC, so user
327          * knows whether they set it correctly on the DIP switches.
328          */
329         pr_info("XTFPGA: Ethernet MAC %pM\n", ethoc_pdata.hwaddr);
330         ethoc_pdata.eth_clkfreq = *(long *)XTFPGA_CLKFRQ_VADDR;
331 
332         return 0;
333 }
334 
335 /*
336  * Register to be done during do_initcalls().
337  */
338 arch_initcall(xtavnet_init);
339 
340 #endif /* CONFIG_OF */
341 

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