2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
7 * Copyright (C) 2006 FON Technology, SL.
8 * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
9 * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
13 * Platform devices for Atheros SoCs
16 #include <linux/autoconf.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/platform_device.h>
22 #include <linux/kernel.h>
23 #include <linux/reboot.h>
24 #include <linux/delay.h>
25 #include <asm/bootinfo.h>
26 #include <asm/reboot.h>
31 #include <linux/leds.h>
34 static int is_5315 = 0;
36 static struct resource ar5315_eth_res[] = {
38 .name = "eth0_membase",
39 .flags = IORESOURCE_MEM,
40 .start = AR5315_ENET0,
41 .end = AR5315_ENET0 + 0x2000,
45 .flags = IORESOURCE_IRQ,
46 .start = AR5315_IRQ_ENET0_INTRS,
47 .end = AR5315_IRQ_ENET0_INTRS,
51 static struct ar531x_eth ar5315_eth_data = {
54 .reset_base = AR5315_RESET,
55 .reset_mac = AR5315_RESET_ENET0,
56 .reset_phy = AR5315_RESET_EPHY0,
57 .phy_base = AR5315_ENET0
60 static struct platform_device ar5315_eth = {
63 .dev.platform_data = &ar5315_eth_data,
64 .resource = ar5315_eth_res,
65 .num_resources = ARRAY_SIZE(ar5315_eth_res)
68 static struct platform_device ar5315_wmac = {
70 .name = "ar531x-wmac",
71 /* FIXME: add resources */
74 static struct resource ar5315_spiflash_res[] = {
77 .flags = IORESOURCE_MEM,
78 .start = KSEG1ADDR(AR5315_SPI_READ),
79 .end = KSEG1ADDR(AR5315_SPI_READ) + 0x800000,
83 .flags = IORESOURCE_MEM,
89 static struct platform_device ar5315_spiflash = {
92 .resource = ar5315_spiflash_res,
93 .num_resources = ARRAY_SIZE(ar5315_spiflash_res)
96 #ifdef CONFIG_LEDS_GPIO
97 static struct gpio_led ar5315_leds[8];
99 static struct gpio_led_platform_data ar5315_led_data = {
100 .num_leds = ARRAY_SIZE(ar5315_leds),
101 .leds = (void *) ar5315_leds,
104 static struct platform_device ar5315_gpio_leds = {
108 .platform_data = (void *) &ar5315_led_data,
113 static struct platform_device ar5315_wdt =
116 .name = "ar2315_wdt",
119 static __initdata struct platform_device *ar5315_devs[6];
121 static void *flash_regs;
123 static inline __u32 spiflash_regread32(int reg)
125 volatile __u32 *data = (__u32 *)(flash_regs + reg);
130 static inline void spiflash_regwrite32(int reg, __u32 data)
132 volatile __u32 *addr = (__u32 *)(flash_regs + reg);
137 #define SPI_FLASH_CTL 0x00
138 #define SPI_FLASH_OPCODE 0x04
139 #define SPI_FLASH_DATA 0x08
141 static __u8 spiflash_probe(void)
146 reg = spiflash_regread32(SPI_FLASH_CTL);
147 } while (reg & SPI_CTL_BUSY);
149 spiflash_regwrite32(SPI_FLASH_OPCODE, 0xab);
151 reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | 4 |
152 (1 << 4) | SPI_CTL_START;
154 spiflash_regwrite32(SPI_FLASH_CTL, reg);
157 reg = spiflash_regread32(SPI_FLASH_CTL);
158 } while (reg & SPI_CTL_BUSY);
160 reg = (__u32) spiflash_regread32(SPI_FLASH_DATA);
167 #define STM_8MBIT_SIGNATURE 0x13
168 #define STM_16MBIT_SIGNATURE 0x14
169 #define STM_32MBIT_SIGNATURE 0x15
170 #define STM_64MBIT_SIGNATURE 0x16
171 #define STM_128MBIT_SIGNATURE 0x17
174 static char __init *ar5315_flash_limit(void)
179 /* probe the flash chip size */
180 flash_regs = ioremap_nocache(ar5315_spiflash_res[1].start, ar5315_spiflash_res[1].end - ar5315_spiflash_res[1].start);
181 sig = spiflash_probe();
185 case STM_8MBIT_SIGNATURE:
186 flash_size = 0x00100000;
188 case STM_16MBIT_SIGNATURE:
189 flash_size = 0x00200000;
191 case STM_32MBIT_SIGNATURE:
192 flash_size = 0x00400000;
194 case STM_64MBIT_SIGNATURE:
195 flash_size = 0x00800000;
197 case STM_128MBIT_SIGNATURE:
198 flash_size = 0x01000000;
202 ar5315_spiflash_res[0].end = ar5315_spiflash_res[0].start + flash_size;
203 return (char *) ar5315_spiflash_res[0].end;
206 int __init ar5315_init_devices(void)
208 struct ar531x_config *config;
209 struct ar531x_boarddata *bcfg;
211 #ifdef CONFIG_LEDS_GPIO
219 /* Find board configuration */
220 ar531x_find_config(ar5315_flash_limit());
221 bcfg = (struct ar531x_boarddata *) board_config;
223 config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL);
224 config->board = board_config;
225 config->radio = radio_config;
227 config->tag = (u_int16_t) (sysRegRead(AR5315_SREV) & AR5315_REV_CHIP);
229 ar5315_eth_data.board_config = board_config;
230 ar5315_eth_data.macaddr = bcfg->enet0Mac;
231 ar5315_wmac.dev.platform_data = config;
233 ar5315_devs[dev++] = &ar5315_eth;
234 ar5315_devs[dev++] = &ar5315_wmac;
235 ar5315_devs[dev++] = &ar5315_spiflash;
236 ar5315_devs[dev++] = &ar5315_wdt;
238 #ifdef CONFIG_LEDS_GPIO
239 ar5315_led_data.num_leds = 0;
240 for(i = 1; i < 8; i++)
242 if((i != AR5315_RESET_GPIO) && (i != bcfg->resetConfigGpio))
244 if(i == bcfg->sysLedGpio)
246 tmp = kstrdup("wlan", GFP_KERNEL);
248 tmp = kmalloc(6, GFP_KERNEL);
250 sprintf((char*)tmp, "gpio%d", i);
254 ar5315_leds[ar5315_led_data.num_leds].name = tmp;
255 ar5315_leds[ar5315_led_data.num_leds].gpio = i;
256 ar5315_leds[ar5315_led_data.num_leds].active_low = 0;
257 ar5315_led_data.num_leds++;
259 printk("failed to alloc led string\n");
264 ar5315_devs[dev++] = &ar5315_gpio_leds;
267 return platform_add_devices(ar5315_devs, dev);
270 static void ar5315_halt(void)
275 static void ar5315_power_off(void)
281 static void ar5315_restart(char *command)
283 void (*mips_reset_vec)(void) = (void *) 0xbfc00000;
285 /* reset the system */
286 sysRegWrite(AR5315_COLD_RESET,AR5317_RESET_SYSTEM);
288 /* Cold reset does not work on the AR2315/6, use the GPIO reset bits a workaround.
289 * give it some time to attempt a gpio based hardware reset
290 * (atheros reference design workaround) */
291 gpio_direction_output(AR5315_RESET_GPIO, 0);
294 /* Some boards (e.g. Senao EOC-2610) don't implement the reset logic
295 * workaround. Attempt to jump to the mips reset location -
296 * the boot loader itself might be able to recover the system */
302 * This table is indexed by bits 5..4 of the CLOCKCTL1 register
303 * to determine the predevisor value.
305 static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = {
312 static int __initdata PLLC_DIVIDE_TABLE[5] = {
320 static unsigned int __init
321 ar5315_sys_clk(unsigned int clockCtl)
323 unsigned int pllcCtrl,cpuDiv;
324 unsigned int pllcOut,refdiv,fdiv,divby2;
327 pllcCtrl = sysRegRead(AR5315_PLLC_CTL);
328 refdiv = (pllcCtrl & PLLC_REF_DIV_M) >> PLLC_REF_DIV_S;
329 refdiv = CLOCKCTL1_PREDIVIDE_TABLE[refdiv];
330 fdiv = (pllcCtrl & PLLC_FDBACK_DIV_M) >> PLLC_FDBACK_DIV_S;
331 divby2 = (pllcCtrl & PLLC_ADD_FDBACK_DIV_M) >> PLLC_ADD_FDBACK_DIV_S;
333 pllcOut = (40000000/refdiv)*(2*divby2)*fdiv;
336 /* clkm input selected */
337 switch(clockCtl & CPUCLK_CLK_SEL_M) {
340 clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKM_DIV_M) >> PLLC_CLKM_DIV_S];
343 clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKC_DIV_M) >> PLLC_CLKC_DIV_S];
350 cpuDiv = (clockCtl & CPUCLK_CLK_DIV_M) >> CPUCLK_CLK_DIV_S;
351 cpuDiv = cpuDiv * 2 ?: 1;
352 return (pllcOut/(clkDiv * cpuDiv));
355 static inline unsigned int ar5315_cpu_frequency(void)
357 return ar5315_sys_clk(sysRegRead(AR5315_CPUCLK));
360 static inline unsigned int ar5315_apb_frequency(void)
362 return ar5315_sys_clk(sysRegRead(AR5315_AMBACLK));
365 static void __init ar5315_time_init(void)
367 mips_hpt_frequency = ar5315_cpu_frequency() / 2;
370 void __init ar5315_prom_init(void)
372 u32 memsize, memcfg, devid;
375 memcfg = sysRegRead(AR5315_MEM_CFG);
376 memsize = 1 + ((memcfg & SDRAM_DATA_WIDTH_M) >> SDRAM_DATA_WIDTH_S);
377 memsize <<= 1 + ((memcfg & SDRAM_COL_WIDTH_M) >> SDRAM_COL_WIDTH_S);
378 memsize <<= 1 + ((memcfg & SDRAM_ROW_WIDTH_M) >> SDRAM_ROW_WIDTH_S);
380 add_memory_region(0, memsize, BOOT_MEM_RAM);
382 /* Detect the hardware based on the device ID */
383 devid = sysRegRead(AR5315_SREV) & AR5315_REV_CHIP;
387 mips_machtype = MACH_ATHEROS_AR2317;
390 mips_machtype = MACH_ATHEROS_AR2315;
395 void __init ar5315_plat_setup(void)
397 unsigned int config = read_c0_config();
399 /* Clear any lingering AHB errors */
400 write_c0_config(config & ~0x3);
401 sysRegWrite(AR5315_AHB_ERR0,AHB_ERROR_DET);
402 sysRegRead(AR5315_AHB_ERR1);
403 sysRegWrite(AR5315_WDC, WDC_IGNORE_EXPIRATION);
405 board_time_init = ar5315_time_init;
407 _machine_restart = ar5315_restart;
408 _machine_halt = ar5315_halt;
409 pm_power_off = ar5315_power_off;
411 serial_setup(KSEG1ADDR(AR5315_UART0), ar5315_apb_frequency());
414 arch_initcall(ar5315_init_devices);