1 /*
2  * Buffalo Terastation Pro II/Live Board Setup
3  *
4  * Maintainer: Sylver Bruneau <sylver.bruneau@googlemail.com>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 #include <linux/gpio.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/platform_device.h>
15 #include <linux/pci.h>
16 #include <linux/irq.h>
17 #include <linux/delay.h>
18 #include <linux/mtd/physmap.h>
19 #include <linux/mv643xx_eth.h>
20 #include <linux/i2c.h>
21 #include <linux/serial_reg.h>
22 #include <asm/mach-types.h>
23 #include <asm/mach/arch.h>
24 #include <asm/mach/pci.h>
25 #include <mach/orion5x.h>
26 #include "common.h"
27 #include "mpp.h"
28 
29 /*****************************************************************************
30  * Terastation Pro 2/Live Info
31  ****************************************************************************/
32 
33 /*
34  * Terastation Pro 2 hardware :
35  * - Marvell 88F5281-D0
36  * - Marvell 88SX6042 SATA controller (PCI)
37  * - Marvell 88E1118 Gigabit Ethernet PHY
38  * - 256KB NOR flash
39  * - 128MB of DDR RAM
40  * - PCIe port (not equipped)
41  */
42 
43 /*
44  * 256K NOR flash Device bus boot chip select
45  */
46 
47 #define TSP2_NOR_BOOT_BASE	0xf4000000
48 #define TSP2_NOR_BOOT_SIZE	SZ_256K
49 
50 /*****************************************************************************
51  * 256KB NOR Flash on BOOT Device
52  ****************************************************************************/
53 
54 static struct physmap_flash_data tsp2_nor_flash_data = {
55 	.width    = 1,
56 };
57 
58 static struct resource tsp2_nor_flash_resource = {
59 	.flags = IORESOURCE_MEM,
60 	.start = TSP2_NOR_BOOT_BASE,
61 	.end   = TSP2_NOR_BOOT_BASE + TSP2_NOR_BOOT_SIZE - 1,
62 };
63 
64 static struct platform_device tsp2_nor_flash = {
65 	.name          = "physmap-flash",
66 	.id            = 0,
67 	.dev           = {
68 		.platform_data	= &tsp2_nor_flash_data,
69 	},
70 	.num_resources = 1,
71 	.resource      = &tsp2_nor_flash_resource,
72 };
73 
74 /*****************************************************************************
75  * PCI
76  ****************************************************************************/
77 #define TSP2_PCI_SLOT0_OFFS		7
78 #define TSP2_PCI_SLOT0_IRQ_PIN		11
79 
80 static void __init tsp2_pci_preinit(void)
81 {
82 	int pin;
83 
84 	/*
85 	 * Configure PCI GPIO IRQ pins
86 	 */
87 	pin = TSP2_PCI_SLOT0_IRQ_PIN;
88 	if (gpio_request(pin, "PCI Int1") == 0) {
89 		if (gpio_direction_input(pin) == 0) {
90 			irq_set_irq_type(gpio_to_irq(pin), IRQ_TYPE_LEVEL_LOW);
91 		} else {
92 			printk(KERN_ERR "tsp2_pci_preinit failed "
93 					"to set_irq_type pin %d\n", pin);
94 			gpio_free(pin);
95 		}
96 	} else {
97 		printk(KERN_ERR "tsp2_pci_preinit failed to "
98 				"gpio_request %d\n", pin);
99 	}
100 }
101 
102 static int __init tsp2_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
103 {
104 	int irq;
105 
106 	/*
107 	 * Check for devices with hard-wired IRQs.
108 	 */
109 	irq = orion5x_pci_map_irq(dev, slot, pin);
110 	if (irq != -1)
111 		return irq;
112 
113 	/*
114 	 * PCI IRQs are connected via GPIOs.
115 	 */
116 	if (slot == TSP2_PCI_SLOT0_OFFS)
117 		return gpio_to_irq(TSP2_PCI_SLOT0_IRQ_PIN);
118 
119 	return -1;
120 }
121 
122 static struct hw_pci tsp2_pci __initdata = {
123 	.nr_controllers = 2,
124 	.preinit        = tsp2_pci_preinit,
125 	.setup          = orion5x_pci_sys_setup,
126 	.scan           = orion5x_pci_sys_scan_bus,
127 	.map_irq        = tsp2_pci_map_irq,
128 };
129 
130 static int __init tsp2_pci_init(void)
131 {
132 	if (machine_is_terastation_pro2())
133 		pci_common_init(&tsp2_pci);
134 
135 	return 0;
136 }
137 
138 subsys_initcall(tsp2_pci_init);
139 
140 /*****************************************************************************
141  * Ethernet
142  ****************************************************************************/
143 
144 static struct mv643xx_eth_platform_data tsp2_eth_data = {
145 	.phy_addr	= 0,
146 };
147 
148 /*****************************************************************************
149  * RTC 5C372a on I2C bus
150  ****************************************************************************/
151 
152 #define TSP2_RTC_GPIO	9
153 
154 static struct i2c_board_info __initdata tsp2_i2c_rtc = {
155 	I2C_BOARD_INFO("rs5c372a", 0x32),
156 };
157 
158 /*****************************************************************************
159  * Terastation Pro II specific power off method via UART1-attached
160  * microcontroller
161  ****************************************************************************/
162 
163 #define UART1_REG(x)	(UART1_VIRT_BASE + ((UART_##x) << 2))
164 
165 static int tsp2_miconread(unsigned char *buf, int count)
166 {
167 	int i;
168 	int timeout;
169 
170 	for (i = 0; i < count; i++) {
171 		timeout = 10;
172 
173 		while (!(readl(UART1_REG(LSR)) & UART_LSR_DR)) {
174 			if (--timeout == 0)
175 				break;
176 			udelay(1000);
177 		}
178 
179 		if (timeout == 0)
180 			break;
181 		buf[i] = readl(UART1_REG(RX));
182 	}
183 
184 	/* return read bytes */
185 	return i;
186 }
187 
188 static int tsp2_miconwrite(const unsigned char *buf, int count)
189 {
190 	int i = 0;
191 
192 	while (count--) {
193 		while (!(readl(UART1_REG(LSR)) & UART_LSR_THRE))
194 			barrier();
195 		writel(buf[i++], UART1_REG(TX));
196 	}
197 
198 	return 0;
199 }
200 
201 static int tsp2_miconsend(const unsigned char *data, int count)
202 {
203 	int i;
204 	unsigned char checksum = 0;
205 	unsigned char recv_buf[40];
206 	unsigned char send_buf[40];
207 	unsigned char correct_ack[3];
208 	int retry = 2;
209 
210 	/* Generate checksum */
211 	for (i = 0; i < count; i++)
212 		checksum -=  data[i];
213 
214 	do {
215 		/* Send data */
216 		tsp2_miconwrite(data, count);
217 
218 		/* send checksum */
219 		tsp2_miconwrite(&checksum, 1);
220 
221 		if (tsp2_miconread(recv_buf, sizeof(recv_buf)) <= 3) {
222 			printk(KERN_ERR ">%s: receive failed.\n", __func__);
223 
224 			/* send preamble to clear the receive buffer */
225 			memset(&send_buf, 0xff, sizeof(send_buf));
226 			tsp2_miconwrite(send_buf, sizeof(send_buf));
227 
228 			/* make dummy reads */
229 			mdelay(100);
230 			tsp2_miconread(recv_buf, sizeof(recv_buf));
231 		} else {
232 			/* Generate expected ack */
233 			correct_ack[0] = 0x01;
234 			correct_ack[1] = data[1];
235 			correct_ack[2] = 0x00;
236 
237 			/* checksum Check */
238 			if ((recv_buf[0] + recv_buf[1] + recv_buf[2] +
239 			     recv_buf[3]) & 0xFF) {
240 				printk(KERN_ERR ">%s: Checksum Error : "
241 					"Received data[%02x, %02x, %02x, %02x]"
242 					"\n", __func__, recv_buf[0],
243 					recv_buf[1], recv_buf[2], recv_buf[3]);
244 			} else {
245 				/* Check Received Data */
246 				if (correct_ack[0] == recv_buf[0] &&
247 				    correct_ack[1] == recv_buf[1] &&
248 				    correct_ack[2] == recv_buf[2]) {
249 					/* Interval for next command */
250 					mdelay(10);
251 
252 					/* Receive ACK */
253 					return 0;
254 				}
255 			}
256 			/* Received NAK or illegal Data */
257 			printk(KERN_ERR ">%s: Error : NAK or Illegal Data "
258 					"Received\n", __func__);
259 		}
260 	} while (retry--);
261 
262 	/* Interval for next command */
263 	mdelay(10);
264 
265 	return -1;
266 }
267 
268 static void tsp2_power_off(void)
269 {
270 	const unsigned char watchdogkill[]	= {0x01, 0x35, 0x00};
271 	const unsigned char shutdownwait[]	= {0x00, 0x0c};
272 	const unsigned char poweroff[]		= {0x00, 0x06};
273 	/* 38400 baud divisor */
274 	const unsigned divisor = ((orion5x_tclk + (8 * 38400)) / (16 * 38400));
275 
276 	pr_info("%s: triggering power-off...\n", __func__);
277 
278 	/* hijack uart1 and reset into sane state (38400,8n1,even parity) */
279 	writel(0x83, UART1_REG(LCR));
280 	writel(divisor & 0xff, UART1_REG(DLL));
281 	writel((divisor >> 8) & 0xff, UART1_REG(DLM));
282 	writel(0x1b, UART1_REG(LCR));
283 	writel(0x00, UART1_REG(IER));
284 	writel(0x07, UART1_REG(FCR));
285 	writel(0x00, UART1_REG(MCR));
286 
287 	/* Send the commands to shutdown the Terastation Pro II */
288 	tsp2_miconsend(watchdogkill, sizeof(watchdogkill)) ;
289 	tsp2_miconsend(shutdownwait, sizeof(shutdownwait)) ;
290 	tsp2_miconsend(poweroff, sizeof(poweroff));
291 }
292 
293 /*****************************************************************************
294  * General Setup
295  ****************************************************************************/
296 static unsigned int tsp2_mpp_modes[] __initdata = {
297 	MPP0_PCIE_RST_OUTn,
298 	MPP1_UNUSED,
299 	MPP2_UNUSED,
300 	MPP3_UNUSED,
301 	MPP4_NAND,		/* BOOT NAND Flash REn */
302 	MPP5_NAND,		/* BOOT NAND Flash WEn */
303 	MPP6_NAND,		/* BOOT NAND Flash HREn[0] */
304 	MPP7_NAND,		/* BOOT NAND Flash WEn[0] */
305 	MPP8_GPIO,		/* MICON int */
306 	MPP9_GPIO,		/* RTC int */
307 	MPP10_UNUSED,
308 	MPP11_GPIO,		/* PCI Int A */
309 	MPP12_UNUSED,
310 	MPP13_GPIO,		/* UPS on UART0 enable */
311 	MPP14_GPIO,		/* UPS low battery detection */
312 	MPP15_UNUSED,
313 	MPP16_UART,		/* UART1 RXD */
314 	MPP17_UART,		/* UART1 TXD */
315 	MPP18_UART,		/* UART1 CTSn */
316 	MPP19_UART,		/* UART1 RTSn */
317 	0,
318 };
319 
320 static void __init tsp2_init(void)
321 {
322 	/*
323 	 * Setup basic Orion functions. Need to be called early.
324 	 */
325 	orion5x_init();
326 
327 	orion5x_mpp_conf(tsp2_mpp_modes);
328 
329 	/*
330 	 * Configure peripherals.
331 	 */
332 	mvebu_mbus_add_window_by_id(ORION_MBUS_DEVBUS_BOOT_TARGET,
333 				    ORION_MBUS_DEVBUS_BOOT_ATTR,
334 				    TSP2_NOR_BOOT_BASE,
335 				    TSP2_NOR_BOOT_SIZE);
336 	platform_device_register(&tsp2_nor_flash);
337 
338 	orion5x_ehci0_init();
339 	orion5x_eth_init(&tsp2_eth_data);
340 	orion5x_i2c_init();
341 	orion5x_uart0_init();
342 	orion5x_uart1_init();
343 
344 	/* Get RTC IRQ and register the chip */
345 	if (gpio_request(TSP2_RTC_GPIO, "rtc") == 0) {
346 		if (gpio_direction_input(TSP2_RTC_GPIO) == 0)
347 			tsp2_i2c_rtc.irq = gpio_to_irq(TSP2_RTC_GPIO);
348 		else
349 			gpio_free(TSP2_RTC_GPIO);
350 	}
351 	if (tsp2_i2c_rtc.irq == 0)
352 		pr_warning("tsp2_init: failed to get RTC IRQ\n");
353 	i2c_register_board_info(0, &tsp2_i2c_rtc, 1);
354 
355 	/* register Terastation Pro II specific power-off method */
356 	pm_power_off = tsp2_power_off;
357 }
358 
359 MACHINE_START(TERASTATION_PRO2, "Buffalo Terastation Pro II/Live")
360 	/* Maintainer:  Sylver Bruneau <sylver.bruneau@googlemail.com> */
361 	.atag_offset	= 0x100,
362 	.init_machine	= tsp2_init,
363 	.map_io		= orion5x_map_io,
364 	.init_early	= orion5x_init_early,
365 	.init_irq	= orion5x_init_irq,
366 	.init_time	= orion5x_timer_init,
367 	.fixup		= tag_fixup_mem32,
368 	.restart	= orion5x_restart,
369 MACHINE_END
370