avr32: add RTS/CTS/CLK pin selection for the USARTs
[linux-2.6.git] / arch / avr32 / boards / merisc / setup.c
1 /*
2  * Board-specific setup code for the Merisc
3  *
4  * Copyright (C) 2008 Martinsson Elektronik AB
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/clk.h>
11 #include <linux/etherdevice.h>
12 #include <linux/i2c.h>
13 #include <linux/i2c-gpio.h>
14 #include <linux/gpio.h>
15 #include <linux/init.h>
16 #include <linux/linkage.h>
17 #include <linux/platform_device.h>
18 #include <linux/types.h>
19 #include <linux/leds.h>
20 #include <linux/spi/spi.h>
21 #include <linux/spi/ads7846.h>
22 #include <linux/irq.h>
23 #include <linux/fb.h>
24 #include <linux/atmel-mci.h>
25
26 #include <asm/io.h>
27 #include <asm/setup.h>
28 #include <asm/gpio.h>
29
30 #include <mach/at32ap700x.h>
31 #include <mach/board.h>
32 #include <mach/init.h>
33 #include <mach/portmux.h>
34
35 #include "merisc.h"
36
37 /* Holds the autodetected board model and revision */
38 static int merisc_board_id;
39
40 /* Initialized by bootloader-specific startup code. */
41 struct tag *bootloader_tags __initdata;
42
43 /* Oscillator frequencies. These are board specific */
44 unsigned long at32_board_osc_rates[3] = {
45         [0]     = 32768,        /* 32.768 kHz on RTC osc */
46         [1]     = 20000000,     /* 20 MHz on osc0 */
47         [2]     = 12000000,     /* 12 MHz on osc1 */
48 };
49
50 struct eth_addr {
51         u8 addr[6];
52 };
53
54 static struct eth_addr __initdata hw_addr[2];
55 static struct eth_platform_data __initdata eth_data[2];
56
57 static int ads7846_get_pendown_state_PB26(void)
58 {
59         return !gpio_get_value(GPIO_PIN_PB(26));
60 }
61
62 static int ads7846_get_pendown_state_PB28(void)
63 {
64         return !gpio_get_value(GPIO_PIN_PB(28));
65 }
66
67 static struct ads7846_platform_data __initdata ads7846_data = {
68         .model                          = 7846,
69         .vref_delay_usecs               = 100,
70         .vref_mv                        = 0,
71         .keep_vref_on                   = 0,
72         .settle_delay_usecs             = 150,
73         .penirq_recheck_delay_usecs     = 1,
74         .x_plate_ohms                   = 800,
75         .debounce_rep                   = 4,
76         .debounce_max                   = 10,
77         .debounce_tol                   = 50,
78         .get_pendown_state              = ads7846_get_pendown_state_PB26,
79         .filter_init                    = NULL,
80         .filter                         = NULL,
81         .filter_cleanup                 = NULL,
82 };
83
84 static struct spi_board_info __initdata spi0_board_info[] = {
85         {
86                 .modalias       = "ads7846",
87                 .max_speed_hz   = 3250000,
88                 .chip_select    = 0,
89                 .bus_num        = 0,
90                 .platform_data  = &ads7846_data,
91                 .mode           = SPI_MODE_0,
92         },
93 };
94
95 static struct mci_platform_data __initdata mci0_data = {
96         .slot[0] = {
97                 .bus_width      = 4,
98                 .detect_pin     = GPIO_PIN_PE(19),
99                 .wp_pin         = GPIO_PIN_PE(20),
100         },
101 };
102
103 static int __init parse_tag_ethernet(struct tag *tag)
104 {
105         int i;
106
107         i = tag->u.ethernet.mac_index;
108         if (i < ARRAY_SIZE(hw_addr)) {
109                 memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
110                        sizeof(hw_addr[i].addr));
111         }
112
113         return 0;
114 }
115 __tagtable(ATAG_ETHERNET, parse_tag_ethernet);
116
117 static void __init set_hw_addr(struct platform_device *pdev)
118 {
119         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
120         const u8 *addr;
121         void __iomem *regs;
122         struct clk *pclk;
123
124         if (!res)
125                 return;
126
127         if (pdev->id >= ARRAY_SIZE(hw_addr))
128                 return;
129
130         addr = hw_addr[pdev->id].addr;
131         if (!is_valid_ether_addr(addr))
132                 return;
133
134         regs = (void __iomem __force *)res->start;
135         pclk = clk_get(&pdev->dev, "pclk");
136         if (!pclk)
137                 return;
138
139         clk_enable(pclk);
140         __raw_writel((addr[3] << 24) | (addr[2] << 16)
141                      | (addr[1] << 8) | addr[0], regs + 0x98);
142         __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
143         clk_disable(pclk);
144         clk_put(pclk);
145 }
146
147 static struct i2c_gpio_platform_data i2c_gpio_data = {
148         .sda_pin                = GPIO_PIN_PA(6),
149         .scl_pin                = GPIO_PIN_PA(7),
150         .sda_is_open_drain      = 1,
151         .scl_is_open_drain      = 1,
152         .udelay                 = 2,
153 };
154
155 static struct platform_device i2c_gpio_device = {
156         .name   = "i2c-gpio",
157         .id     = 0,
158         .dev    = {
159                 .platform_data  = &i2c_gpio_data,
160         },
161 };
162
163 static struct i2c_board_info __initdata i2c_info[] = {
164         {
165                 I2C_BOARD_INFO("pcf8563", 0x51)
166         },
167 };
168
169 #ifdef CONFIG_LEDS_ATMEL_PWM
170 static struct gpio_led stk_pwm_led[] = {
171         {
172                 .name   = "backlight",
173                 .gpio   = 0,            /* PWM channel 0 (LCD backlight) */
174         },
175 };
176
177 static struct gpio_led_platform_data stk_pwm_led_data = {
178         .num_leds       = ARRAY_SIZE(stk_pwm_led),
179         .leds           = stk_pwm_led,
180 };
181
182 static struct platform_device stk_pwm_led_dev = {
183         .name   = "leds-atmel-pwm",
184         .id     = -1,
185         .dev    = {
186                 .platform_data  = &stk_pwm_led_data,
187         },
188 };
189 #endif
190
191 const char *merisc_model(void)
192 {
193         switch (merisc_board_id) {
194         case 0:
195         case 1:
196                 return "500-01";
197         case 2:
198                 return "BT";
199         default:
200                 return "Unknown";
201         }
202 }
203
204 const char *merisc_revision(void)
205 {
206         switch (merisc_board_id) {
207         case 0:
208                 return "B";
209         case 1:
210                 return "D";
211         case 2:
212                 return "A";
213         default:
214                 return "Unknown";
215         }
216 }
217
218 static void detect_merisc_board_id(void)
219 {
220         /* Board ID pins MUST be set as input or the board may be damaged */
221         at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
222         at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
223         at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
224         at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
225
226         merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
227                 !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
228                 !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
229                 !gpio_get_value(GPIO_PIN_PA(27)) * 8;
230 }
231
232 void __init setup_board(void)
233 {
234         at32_map_usart(0, 0, 0);
235         at32_map_usart(1, 1, 0);
236         at32_map_usart(3, 3, 0);
237         at32_setup_serial_console(1);
238 }
239
240 static int __init merisc_init(void)
241 {
242         detect_merisc_board_id();
243
244         printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
245                merisc_revision());
246
247         /* Reserve pins for SDRAM */
248         at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
249
250         if (merisc_board_id >= 1)
251                 at32_map_usart(2, 2, 0);
252
253         at32_add_device_usart(0);
254         at32_add_device_usart(1);
255         if (merisc_board_id >= 1)
256                 at32_add_device_usart(2);
257         at32_add_device_usart(3);
258         set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
259
260         /* ADS7846 PENIRQ */
261         if (merisc_board_id == 0) {
262                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
263                 at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
264                                    GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
265                 spi0_board_info[0].irq = AT32_EXTINT(1);
266         } else {
267                 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
268                 at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
269                                    AT32_GPIOF_PULLUP);
270                 spi0_board_info[0].irq = AT32_EXTINT(3);
271         }
272
273         /* ADS7846 busy pin */
274         at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
275
276         at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
277
278         at32_add_device_mci(0, &mci0_data);
279
280 #ifdef CONFIG_LEDS_ATMEL_PWM
281         at32_add_device_pwm((1 << 0) | (1 << 2));
282         platform_device_register(&stk_pwm_led_dev);
283 #else
284         at32_add_device_pwm((1 << 2));
285 #endif
286
287         at32_select_gpio(i2c_gpio_data.sda_pin,
288                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
289         at32_select_gpio(i2c_gpio_data.scl_pin,
290                 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
291         platform_device_register(&i2c_gpio_device);
292
293         i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
294
295         return 0;
296 }
297 postcore_initcall(merisc_init);