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 #include "irqs.h"
33
34 #define FSG_SDA_PIN 12
35 #define FSG_SCL_PIN 13
36
37 #define FSG_SB_GPIO 4 /* sync button */
38 #define FSG_RB_GPIO 9 /* reset button */
39 #define FSG_UB_GPIO 10 /* usb button */
40
41 static struct flash_platform_data fsg_flash_data = {
42 .map_name = "cfi_probe",
43 .width = 2,
44 };
45
46 static struct resource fsg_flash_resource = {
47 .flags = IORESOURCE_MEM,
48 };
49
50 static struct platform_device fsg_flash = {
51 .name = "IXP4XX-Flash",
52 .id = 0,
53 .dev = {
54 .platform_data = &fsg_flash_data,
55 },
56 .num_resources = 1,
57 .resource = &fsg_flash_resource,
58 };
59
60 static struct gpiod_lookup_table fsg_i2c_gpiod_table = {
61 .dev_id = "i2c-gpio.0",
62 .table = {
63 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SDA_PIN,
64 NULL, 0, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
65 GPIO_LOOKUP_IDX("IXP4XX_GPIO_CHIP", FSG_SCL_PIN,
66 NULL, 1, GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN),
67 },
68 };
69
70 static struct platform_device fsg_i2c_gpio = {
71 .name = "i2c-gpio",
72 .id = 0,
73 .dev = {
74 .platform_data = NULL,
75 },
76 };
77
78 static struct i2c_board_info __initdata fsg_i2c_board_info [] = {
79 {
80 I2C_BOARD_INFO("isl1208", 0x6f),
81 },
82 };
83
84 static struct resource fsg_uart_resources[] = {
85 {
86 .start = IXP4XX_UART1_BASE_PHYS,
87 .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
88 .flags = IORESOURCE_MEM,
89 },
90 {
91 .start = IXP4XX_UART2_BASE_PHYS,
92 .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
93 .flags = IORESOURCE_MEM,
94 }
95 };
96
97 static struct plat_serial8250_port fsg_uart_data[] = {
98 {
99 .mapbase = IXP4XX_UART1_BASE_PHYS,
100 .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
101 .irq = IRQ_IXP4XX_UART1,
102 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
103 .iotype = UPIO_MEM,
104 .regshift = 2,
105 .uartclk = IXP4XX_UART_XTAL,
106 },
107 {
108 .mapbase = IXP4XX_UART2_BASE_PHYS,
109 .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
110 .irq = IRQ_IXP4XX_UART2,
111 .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
112 .iotype = UPIO_MEM,
113 .regshift = 2,
114 .uartclk = IXP4XX_UART_XTAL,
115 },
116 { }
117 };
118
119 static struct platform_device fsg_uart = {
120 .name = "serial8250",
121 .id = PLAT8250_DEV_PLATFORM,
122 .dev = {
123 .platform_data = fsg_uart_data,
124 },
125 .num_resources = ARRAY_SIZE(fsg_uart_resources),
126 .resource = fsg_uart_resources,
127 };
128
129 static struct platform_device fsg_leds = {
130 .name = "fsg-led",
131 .id = -1,
132 };
133
134 /* Built-in 10/100 Ethernet MAC interfaces */
135 static struct eth_plat_info fsg_plat_eth[] = {
136 {
137 .phy = 5,
138 .rxq = 3,
139 .txreadyq = 20,
140 }, {
141 .phy = 4,
142 .rxq = 4,
143 .txreadyq = 21,
144 }
145 };
146
147 static struct platform_device fsg_eth[] = {
148 {
149 .name = "ixp4xx_eth",
150 .id = IXP4XX_ETH_NPEB,
151 .dev = {
152 .platform_data = fsg_plat_eth,
153 },
154 }, {
155 .name = "ixp4xx_eth",
156 .id = IXP4XX_ETH_NPEC,
157 .dev = {
158 .platform_data = fsg_plat_eth + 1,
159 },
160 }
161 };
162
163 static struct platform_device *fsg_devices[] __initdata = {
164 &fsg_i2c_gpio,
165 &fsg_flash,
166 &fsg_leds,
167 &fsg_eth[0],
168 &fsg_eth[1],
169 };
170
fsg_power_handler(int irq,void * dev_id)171 static irqreturn_t fsg_power_handler(int irq, void *dev_id)
172 {
173 /* Signal init to do the ctrlaltdel action, this will bypass init if
174 * it hasn't started and do a kernel_restart.
175 */
176 ctrl_alt_del();
177
178 return IRQ_HANDLED;
179 }
180
fsg_reset_handler(int irq,void * dev_id)181 static irqreturn_t fsg_reset_handler(int irq, void *dev_id)
182 {
183 /* This is the paper-clip reset which does an emergency reboot. */
184 printk(KERN_INFO "Restarting system.\n");
185 machine_restart(NULL);
186
187 /* This should never be reached. */
188 return IRQ_HANDLED;
189 }
190
fsg_init(void)191 static void __init fsg_init(void)
192 {
193 uint8_t __iomem *f;
194
195 ixp4xx_sys_init();
196
197 fsg_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
198 fsg_flash_resource.end =
199 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
200
201 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
202 *IXP4XX_EXP_CS1 = *IXP4XX_EXP_CS0;
203
204 /* Configure CS2 for operation, 8bit and writable */
205 *IXP4XX_EXP_CS2 = 0xbfff0002;
206
207 gpiod_add_lookup_table(&fsg_i2c_gpiod_table);
208 i2c_register_board_info(0, fsg_i2c_board_info,
209 ARRAY_SIZE(fsg_i2c_board_info));
210
211 /* This is only useful on a modified machine, but it is valuable
212 * to have it first in order to see debug messages, and so that
213 * it does *not* get removed if platform_add_devices fails!
214 */
215 (void)platform_device_register(&fsg_uart);
216
217 platform_add_devices(fsg_devices, ARRAY_SIZE(fsg_devices));
218
219 if (request_irq(gpio_to_irq(FSG_RB_GPIO), &fsg_reset_handler,
220 IRQF_TRIGGER_LOW, "FSG reset button", NULL) < 0) {
221
222 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
223 gpio_to_irq(FSG_RB_GPIO));
224 }
225
226 if (request_irq(gpio_to_irq(FSG_SB_GPIO), &fsg_power_handler,
227 IRQF_TRIGGER_LOW, "FSG power button", NULL) < 0) {
228
229 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
230 gpio_to_irq(FSG_SB_GPIO));
231 }
232
233 /*
234 * Map in a portion of the flash and read the MAC addresses.
235 * Since it is stored in BE in the flash itself, we need to
236 * byteswap it if we're in LE mode.
237 */
238 f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x400000);
239 if (f) {
240 #ifdef __ARMEB__
241 int i;
242 for (i = 0; i < 6; i++) {
243 fsg_plat_eth[0].hwaddr[i] = readb(f + 0x3C0422 + i);
244 fsg_plat_eth[1].hwaddr[i] = readb(f + 0x3C043B + i);
245 }
246 #else
247
248 /*
249 Endian-swapped reads from unaligned addresses are
250 required to extract the two MACs from the big-endian
251 Redboot config area in flash.
252 */
253
254 fsg_plat_eth[0].hwaddr[0] = readb(f + 0x3C0421);
255 fsg_plat_eth[0].hwaddr[1] = readb(f + 0x3C0420);
256 fsg_plat_eth[0].hwaddr[2] = readb(f + 0x3C0427);
257 fsg_plat_eth[0].hwaddr[3] = readb(f + 0x3C0426);
258 fsg_plat_eth[0].hwaddr[4] = readb(f + 0x3C0425);
259 fsg_plat_eth[0].hwaddr[5] = readb(f + 0x3C0424);
260
261 fsg_plat_eth[1].hwaddr[0] = readb(f + 0x3C0439);
262 fsg_plat_eth[1].hwaddr[1] = readb(f + 0x3C043F);
263 fsg_plat_eth[1].hwaddr[2] = readb(f + 0x3C043E);
264 fsg_plat_eth[1].hwaddr[3] = readb(f + 0x3C043D);
265 fsg_plat_eth[1].hwaddr[4] = readb(f + 0x3C043C);
266 fsg_plat_eth[1].hwaddr[5] = readb(f + 0x3C0443);
267 #endif
268 iounmap(f);
269 }
270 printk(KERN_INFO "FSG: Using MAC address %pM for port 0\n",
271 fsg_plat_eth[0].hwaddr);
272 printk(KERN_INFO "FSG: Using MAC address %pM for port 1\n",
273 fsg_plat_eth[1].hwaddr);
274
275 }
276
277 MACHINE_START(FSG, "Freecom FSG-3")
278 /* Maintainer: www.nslu2-linux.org */
279 .map_io = ixp4xx_map_io,
280 .init_early = ixp4xx_init_early,
281 .init_irq = ixp4xx_init_irq,
282 .init_time = ixp4xx_timer_init,
283 .atag_offset = 0x100,
284 .init_machine = fsg_init,
285 #if defined(CONFIG_PCI)
286 .dma_zone_size = SZ_64M,
287 #endif
288 .restart = ixp4xx_restart,
289 MACHINE_END
290
291
