1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/arm/mach-ixp4xx/fsg-setup.c
4 *
5 * FSG board-setup
6 *
7 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
8 *
9 * based on ixdp425-setup.c:
10 * Copyright (C) 2003-2004 MontaVista Software, Inc.
11 * based on nslu2-power.c
12 * Copyright (C) 2005 Tower Technologies
13 *
14 * Author: Rod Whitby <rod@whitby.id.au>
15 * Maintainers: http://www.nslu2-linux.org/
16 *
17 */
18 #include <linux/gpio.h>
19 #include <linux/if_ether.h>
20 #include <linux/irq.h>
21 #include <linux/serial.h>
22 #include <linux/serial_8250.h>
23 #include <linux/leds.h>
24 #include <linux/reboot.h>
25 #include <linux/i2c.h>
26 #include <linux/i2c-gpio.h>
27 #include <linux/io.h>
28 #include <asm/mach-types.h>
29 #include <asm/mach/arch.h>
30 #include <asm/mach/flash.h>
31
32 #define FSG_SDA_PIN 12
33 #define FSG_SCL_PIN 13
34
35 #define FSG_SB_GPIO 4 /* sync button */
36 #define FSG_RB_GPIO 9 /* reset button */
37 #define FSG_UB_GPIO 10 /* usb button */
38
39 static struct flash_platform_data fsg_flash_data = {
40 .map_name = "cfi_probe",
41 .width = 2,
42 };
43
44 static struct resource fsg_flash_resource = {
45 .flags = IORESOURCE_MEM,
46 };
47
48 static struct platform_device fsg_flash = {
49 .name = "IXP4XX-Flash",
50 .id = 0,
51 .dev = {
52 .platform_data = &fsg_flash_data,
53 },
54 .num_resources = 1,
55 .resource = &fsg_flash_resource,
56 };
57
58 static struct i2c_gpio_platform_data fsg_i2c_gpio_data = {
59 .sda_pin = FSG_SDA_PIN,
60 .scl_pin = FSG_SCL_PIN,
61 };
62
63 static struct platform_device fsg_i2c_gpio = {
64 .name = "i2c-gpio",
65 .id = 0,
66 .dev = {
67 .platform_data = &fsg_i2c_gpio_data,
68 },
69 };
70
71 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
72 {
73 I2C_BOARD_INFO("isl1208", 0x6f),
74 },
75 };
76
77 static struct resource fsg_uart_resources[] = {
78 {
79 .start = IXP4XX_UART1_BASE_PHYS,
80 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
81 .flags = IORESOURCE_MEM,
82 },
83 {
84 .start = IXP4XX_UART2_BASE_PHYS,
85 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
86 .flags = IORESOURCE_MEM,
87 }
88 };
89
90 static struct plat_serial8250_port fsg_uart_data[] = {
91 {
92 .mapbase = IXP4XX_UART1_BASE_PHYS,
93 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
94 .irq = IRQ_IXP4XX_UART1,
95 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
96 .iotype = UPIO_MEM,
97 .regshift = 2,
98 .uartclk = IXP4XX_UART_XTAL,
99 },
100 {
101 .mapbase = IXP4XX_UART2_BASE_PHYS,
102 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
103 .irq = IRQ_IXP4XX_UART2,
104 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
105 .iotype = UPIO_MEM,
106 .regshift = 2,
107 .uartclk = IXP4XX_UART_XTAL,
108 },
109 { }
110 };
111
112 static struct platform_device fsg_uart = {
113 .name = "serial8250",
114 .id = PLAT8250_DEV_PLATFORM,
115 .dev = {
116 .platform_data = fsg_uart_data,
117 },
118 .num_resources = ARRAY_SIZE(fsg_uart_resources),
119 .resource = fsg_uart_resources,
120 };
121
122 static struct platform_device fsg_leds = {
123 .name = "fsg-led",
124 .id = -1,
125 };
126
127 /* Built-in 10/100 Ethernet MAC interfaces */
128 static struct eth_plat_info fsg_plat_eth[] = {
129 {
130 .phy = 5,
131 .rxq = 3,
132 .txreadyq = 20,
133 }, {
134 .phy = 4,
135 .rxq = 4,
136 .txreadyq = 21,
137 }
138 };
139
140 static struct platform_device fsg_eth[] = {
141 {
142 .name = "ixp4xx_eth",
143 .id = IXP4XX_ETH_NPEB,
144 .dev = {
145 .platform_data = fsg_plat_eth,
146 },
147 }, {
148 .name = "ixp4xx_eth",
149 .id = IXP4XX_ETH_NPEC,
150 .dev = {
151 .platform_data = fsg_plat_eth + 1,
152 },
153 }
154 };
155
156 static struct platform_device *fsg_devices[] __initdata = {
157 &fsg_i2c_gpio,
158 &fsg_flash,
159 &fsg_leds,
160 &fsg_eth[0],
161 &fsg_eth[1],
162 };
163
fsg_power_handler(int irq,void * dev_id)164 static irqreturn_t fsg_power_handler(int irq, void *dev_id)
165 {
166 /* Signal init to do the ctrlaltdel action, this will bypass init if
167 * it hasn't started and do a kernel_restart.
168 */
169 ctrl_alt_del();
170
171 return IRQ_HANDLED;
172 }
173
fsg_reset_handler(int irq,void * dev_id)174 static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
175 {
176 /* This is the paper-clip reset which does an emergency reboot. */
177 printk(KERN_INFO "Restarting system.\n");
178 machine_restart(NULL);
179
180 /* This should never be reached. */
181 return IRQ_HANDLED;
182 }
183
fsg_init(void)184 static void __init fsg_init(void)
185 {
186 uint8_t __iomem *f;
187
188 ixp4xx_sys_init();
189
190 fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
191 fsg_flash_resource.end =
192 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
193
194 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
195 *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
196
197 /* Configure CS2 for operation, 8bit and writable */
198 *IXP4XX_EXP_CS2 = 0xbfff0002;
199
200 i2c_register_board_info(0, fsg_i2c_board_info,
201 ARRAY_SIZE(fsg_i2c_board_info));
202
203 /* This is only useful on a modified machine, but it is valuable
204 * to have it first in order to see debug messages, and so that
205 * it does *not* get removed if platform_add_devices fails!
206 */
207 (void)platform_device_register(&fsg_uart);
208
209 platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
210
211 if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
212 IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
213
214 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
215 gpio_to_irq(FSG_RB_GPIO));
216 }
217
218 if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
219 IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
220
221 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
222 gpio_to_irq(FSG_SB_GPIO));
223 }
224
225 /*
226 * Map in a portion of the flash and read the MAC addresses.
227 * Since it is stored in BE in the flash itself, we need to
228 * byteswap it if we're in LE mode.
229 */
230 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
231 if (f) {
232 #ifdef __ARMEB__
233 int i;
234 for (i = 0; i < 6; i++) {
235 fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
236 fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
237 }
238 #else
239
240 /*
241 Endian-swapped reads from unaligned addresses are
242 required to extract the two MACs from the big-endian
243 Redboot config area in flash.
244 */
245
246 fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
247 fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
248 fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
249 fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
250 fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
251 fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
252
253 fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
254 fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
255 fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
256 fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
257 fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
258 fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
259 #endif
260 iounmap(f);
261 }
262 printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
263 fsg_plat_eth[0].hwaddr);
264 printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
265 fsg_plat_eth[1].hwaddr);
266
267 }
268
269 MACHINE_START(FSG, "Freecom FSG-3")
270 /* Maintainer: www.nslu2-linux.org */
271 .map_io = ixp4xx_map_io,
272 .init_early = ixp4xx_init_early,
273 .init_irq = ixp4xx_init_irq,
274 .init_time = ixp4xx_timer_init,
275 .atag_offset = 0x100,
276 .init_machine = fsg_init,
277 #if defined(CONFIG_PCI)
278 .dma_zone_size = SZ_64M,
279 #endif
280 .restart = ixp4xx_restart,
281 MACHINE_END
282
283