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/gpio/machine.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 gpiod_lookup_table fsg_i2c_gpiod_table = {
59 .dev_id = "i2c-gpio.0",
60 .table = {
61 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
62 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
63 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
64 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
65 },
66 };
67
68 static struct platform_device fsg_i2c_gpio = {
69 .name = "i2c-gpio",
70 .id = 0,
71 .dev = {
72 .platform_data = NULL,
73 },
74 };
75
76 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
77 {
78 I2C_BOARD_INFO("isl1208", 0x6f),
79 },
80 };
81
82 static struct resource fsg_uart_resources[] = {
83 {
84 .start = IXP4XX_UART1_BASE_PHYS,
85 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
86 .flags = IORESOURCE_MEM,
87 },
88 {
89 .start = IXP4XX_UART2_BASE_PHYS,
90 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
91 .flags = IORESOURCE_MEM,
92 }
93 };
94
95 static struct plat_serial8250_port fsg_uart_data[] = {
96 {
97 .mapbase = IXP4XX_UART1_BASE_PHYS,
98 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
99 .irq = IRQ_IXP4XX_UART1,
100 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
101 .iotype = UPIO_MEM,
102 .regshift = 2,
103 .uartclk = IXP4XX_UART_XTAL,
104 },
105 {
106 .mapbase = IXP4XX_UART2_BASE_PHYS,
107 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
108 .irq = IRQ_IXP4XX_UART2,
109 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
110 .iotype = UPIO_MEM,
111 .regshift = 2,
112 .uartclk = IXP4XX_UART_XTAL,
113 },
114 { }
115 };
116
117 static struct platform_device fsg_uart = {
118 .name = "serial8250",
119 .id = PLAT8250_DEV_PLATFORM,
120 .dev = {
121 .platform_data = fsg_uart_data,
122 },
123 .num_resources = ARRAY_SIZE(fsg_uart_resources),
124 .resource = fsg_uart_resources,
125 };
126
127 static struct platform_device fsg_leds = {
128 .name = "fsg-led",
129 .id = -1,
130 };
131
132 /* Built-in 10/100 Ethernet MAC interfaces */
133 static struct eth_plat_info fsg_plat_eth[] = {
134 {
135 .phy = 5,
136 .rxq = 3,
137 .txreadyq = 20,
138 }, {
139 .phy = 4,
140 .rxq = 4,
141 .txreadyq = 21,
142 }
143 };
144
145 static struct platform_device fsg_eth[] = {
146 {
147 .name = "ixp4xx_eth",
148 .id = IXP4XX_ETH_NPEB,
149 .dev = {
150 .platform_data = fsg_plat_eth,
151 },
152 }, {
153 .name = "ixp4xx_eth",
154 .id = IXP4XX_ETH_NPEC,
155 .dev = {
156 .platform_data = fsg_plat_eth + 1,
157 },
158 }
159 };
160
161 static struct platform_device *fsg_devices[] __initdata = {
162 &fsg_i2c_gpio,
163 &fsg_flash,
164 &fsg_leds,
165 &fsg_eth[0],
166 &fsg_eth[1],
167 };
168
fsg_power_handler(int irq,void * dev_id)169 static irqreturn_t fsg_power_handler(int irq, void *dev_id)
170 {
171 /* Signal init to do the ctrlaltdel action, this will bypass init if
172 * it hasn't started and do a kernel_restart.
173 */
174 ctrl_alt_del();
175
176 return IRQ_HANDLED;
177 }
178
fsg_reset_handler(int irq,void * dev_id)179 static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
180 {
181 /* This is the paper-clip reset which does an emergency reboot. */
182 printk(KERN_INFO "Restarting system.\n");
183 machine_restart(NULL);
184
185 /* This should never be reached. */
186 return IRQ_HANDLED;
187 }
188
fsg_init(void)189 static void __init fsg_init(void)
190 {
191 uint8_t __iomem *f;
192
193 ixp4xx_sys_init();
194
195 fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
196 fsg_flash_resource.end =
197 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
198
199 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
200 *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
201
202 /* Configure CS2 for operation, 8bit and writable */
203 *IXP4XX_EXP_CS2 = 0xbfff0002;
204
205 gpiod_add_lookup_table(&fsg_i2c_gpiod_table);
206 i2c_register_board_info(0, fsg_i2c_board_info,
207 ARRAY_SIZE(fsg_i2c_board_info));
208
209 /* This is only useful on a modified machine, but it is valuable
210 * to have it first in order to see debug messages, and so that
211 * it does *not* get removed if platform_add_devices fails!
212 */
213 (void)platform_device_register(&fsg_uart);
214
215 platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
216
217 if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
218 IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
219
220 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
221 gpio_to_irq(FSG_RB_GPIO));
222 }
223
224 if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
225 IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
226
227 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
228 gpio_to_irq(FSG_SB_GPIO));
229 }
230
231 /*
232 * Map in a portion of the flash and read the MAC addresses.
233 * Since it is stored in BE in the flash itself, we need to
234 * byteswap it if we're in LE mode.
235 */
236 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
237 if (f) {
238 #ifdef __ARMEB__
239 int i;
240 for (i = 0; i < 6; i++) {
241 fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
242 fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
243 }
244 #else
245
246 /*
247 Endian-swapped reads from unaligned addresses are
248 required to extract the two MACs from the big-endian
249 Redboot config area in flash.
250 */
251
252 fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
253 fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
254 fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
255 fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
256 fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
257 fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
258
259 fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
260 fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
261 fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
262 fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
263 fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
264 fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
265 #endif
266 iounmap(f);
267 }
268 printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
269 fsg_plat_eth[0].hwaddr);
270 printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
271 fsg_plat_eth[1].hwaddr);
272
273 }
274
275 MACHINE_START(FSG, "Freecom FSG-3")
276 /* Maintainer: www.nslu2-linux.org */
277 .map_io = ixp4xx_map_io,
278 .init_early = ixp4xx_init_early,
279 .init_irq = ixp4xx_init_irq,
280 .init_time = ixp4xx_timer_init,
281 .atag_offset = 0x100,
282 .init_machine = fsg_init,
283 #if defined(CONFIG_PCI)
284 .dma_zone_size = SZ_64M,
285 #endif
286 .restart = ixp4xx_restart,
287 MACHINE_END
288
289