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 macb_platform_data __initdata eth_data[2];
56
ads7846_get_pendown_state_PB26(void)57 static int ads7846_get_pendown_state_PB26(void)
58 {
59 return !gpio_get_value(GPIO_PIN_PB(26));
60 }
61
ads7846_get_pendown_state_PB28(void)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 .detect_is_active_high = true,
101 },
102 };
103
parse_tag_ethernet(struct tag * tag)104 static int __init parse_tag_ethernet(struct tag *tag)
105 {
106 int i;
107
108 i = tag->u.ethernet.mac_index;
109 if (i < ARRAY_SIZE(hw_addr)) {
110 memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
111 sizeof(hw_addr[i].addr));
112 }
113
114 return 0;
115 }
116 __tagtable(ATAG_ETHERNET, parse_tag_ethernet);
117
set_hw_addr(struct platform_device * pdev)118 static void __init set_hw_addr(struct platform_device *pdev)
119 {
120 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
121 const u8 *addr;
122 void __iomem *regs;
123 struct clk *pclk;
124
125 if (!res)
126 return;
127
128 if (pdev->id >= ARRAY_SIZE(hw_addr))
129 return;
130
131 addr = hw_addr[pdev->id].addr;
132 if (!is_valid_ether_addr(addr))
133 return;
134
135 regs = (void __iomem __force *)res->start;
136 pclk = clk_get(&pdev->dev, "pclk");
137 if (IS_ERR(pclk))
138 return;
139
140 clk_enable(pclk);
141 __raw_writel((addr[3] << 24) | (addr[2] << 16)
142 | (addr[1] << 8) | addr[0], regs + 0x98);
143 __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
144 clk_disable(pclk);
145 clk_put(pclk);
146 }
147
148 static struct i2c_gpio_platform_data i2c_gpio_data = {
149 .sda_pin = GPIO_PIN_PA(6),
150 .scl_pin = GPIO_PIN_PA(7),
151 .sda_is_open_drain = 1,
152 .scl_is_open_drain = 1,
153 .udelay = 2,
154 };
155
156 static struct platform_device i2c_gpio_device = {
157 .name = "i2c-gpio",
158 .id = 0,
159 .dev = {
160 .platform_data = &i2c_gpio_data,
161 },
162 };
163
164 static struct i2c_board_info __initdata i2c_info[] = {
165 {
166 I2C_BOARD_INFO("pcf8563", 0x51)
167 },
168 };
169
170 #ifdef CONFIG_LEDS_ATMEL_PWM
171 static struct gpio_led stk_pwm_led[] = {
172 {
173 .name = "backlight",
174 .gpio = 0, /* PWM channel 0 (LCD backlight) */
175 },
176 };
177
178 static struct gpio_led_platform_data stk_pwm_led_data = {
179 .num_leds = ARRAY_SIZE(stk_pwm_led),
180 .leds = stk_pwm_led,
181 };
182
183 static struct platform_device stk_pwm_led_dev = {
184 .name = "leds-atmel-pwm",
185 .id = -1,
186 .dev = {
187 .platform_data = &stk_pwm_led_data,
188 },
189 };
190 #endif
191
merisc_model(void)192 const char *merisc_model(void)
193 {
194 switch (merisc_board_id) {
195 case 0:
196 case 1:
197 return "500-01";
198 case 2:
199 return "BT";
200 default:
201 return "Unknown";
202 }
203 }
204
merisc_revision(void)205 const char *merisc_revision(void)
206 {
207 switch (merisc_board_id) {
208 case 0:
209 return "B";
210 case 1:
211 return "D";
212 case 2:
213 return "A";
214 default:
215 return "Unknown";
216 }
217 }
218
detect_merisc_board_id(void)219 static void detect_merisc_board_id(void)
220 {
221 /* Board ID pins MUST be set as input or the board may be damaged */
222 at32_select_gpio(GPIO_PIN_PA(24), AT32_GPIOF_PULLUP);
223 at32_select_gpio(GPIO_PIN_PA(25), AT32_GPIOF_PULLUP);
224 at32_select_gpio(GPIO_PIN_PA(26), AT32_GPIOF_PULLUP);
225 at32_select_gpio(GPIO_PIN_PA(27), AT32_GPIOF_PULLUP);
226
227 merisc_board_id = !gpio_get_value(GPIO_PIN_PA(24)) +
228 !gpio_get_value(GPIO_PIN_PA(25)) * 2 +
229 !gpio_get_value(GPIO_PIN_PA(26)) * 4 +
230 !gpio_get_value(GPIO_PIN_PA(27)) * 8;
231 }
232
setup_board(void)233 void __init setup_board(void)
234 {
235 at32_map_usart(0, 0, 0);
236 at32_map_usart(1, 1, 0);
237 at32_map_usart(3, 3, 0);
238 at32_setup_serial_console(1);
239 }
240
merisc_init(void)241 static int __init merisc_init(void)
242 {
243 detect_merisc_board_id();
244
245 printk(KERN_NOTICE "BOARD: Merisc %s revision %s\n", merisc_model(),
246 merisc_revision());
247
248 /* Reserve pins for SDRAM */
249 at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL | (1 << 26));
250
251 if (merisc_board_id >= 1)
252 at32_map_usart(2, 2, 0);
253
254 at32_add_device_usart(0);
255 at32_add_device_usart(1);
256 if (merisc_board_id >= 1)
257 at32_add_device_usart(2);
258 at32_add_device_usart(3);
259 set_hw_addr(at32_add_device_eth(0, ð_data[0]));
260
261 /* ADS7846 PENIRQ */
262 if (merisc_board_id == 0) {
263 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB26;
264 at32_select_periph(GPIO_PIOB_BASE, 1 << 26,
265 GPIO_PERIPH_A, AT32_GPIOF_PULLUP);
266 spi0_board_info[0].irq = AT32_EXTINT(1);
267 } else {
268 ads7846_data.get_pendown_state = ads7846_get_pendown_state_PB28;
269 at32_select_periph(GPIO_PIOB_BASE, 1 << 28, GPIO_PERIPH_A,
270 AT32_GPIOF_PULLUP);
271 spi0_board_info[0].irq = AT32_EXTINT(3);
272 }
273
274 /* ADS7846 busy pin */
275 at32_select_gpio(GPIO_PIN_PA(4), AT32_GPIOF_PULLUP);
276
277 at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
278
279 at32_add_device_mci(0, &mci0_data);
280
281 #ifdef CONFIG_LEDS_ATMEL_PWM
282 at32_add_device_pwm((1 << 0) | (1 << 2));
283 platform_device_register(&stk_pwm_led_dev);
284 #else
285 at32_add_device_pwm((1 << 2));
286 #endif
287
288 at32_select_gpio(i2c_gpio_data.sda_pin,
289 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
290 at32_select_gpio(i2c_gpio_data.scl_pin,
291 AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
292 platform_device_register(&i2c_gpio_device);
293
294 i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
295
296 return 0;
297 }
298 postcore_initcall(merisc_init);
299