diff options
Diffstat (limited to 'target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.c')
| -rw-r--r-- | target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.c b/target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.c new file mode 100644 index 000000000..28b9d3f95 --- /dev/null +++ b/target/linux/atheros-2.6/files/arch/mips/atheros/ar5312.c @@ -0,0 +1,471 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved. + * Copyright (C) 2006 FON Technology, SL. + * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org> + * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org> + */ + +/* + * Platform devices for Atheros SoCs + */ + +#include <linux/autoconf.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/mtd/physmap.h> +#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <asm/bootinfo.h> +#include <asm/reboot.h> +#include <asm/time.h> +#include <asm/irq.h> +#include <asm/io.h> +#include "ar531x.h" + + +#define AR531X_IRQ_WLAN0_INTRS MIPS_CPU_IRQ_BASE+2 /* C0_CAUSE: 0x0400 */ +#define AR531X_IRQ_ENET0_INTRS MIPS_CPU_IRQ_BASE+3 /* C0_CAUSE: 0x0800 */ +#define AR531X_IRQ_ENET1_INTRS MIPS_CPU_IRQ_BASE+4 /* C0_CAUSE: 0x1000 */ +#define AR531X_IRQ_WLAN1_INTRS MIPS_CPU_IRQ_BASE+5 /* C0_CAUSE: 0x2000 */ +#define AR531X_IRQ_MISC_INTRS MIPS_CPU_IRQ_BASE+6 /* C0_CAUSE: 0x4000 */ + + +static struct platform_device *ar5312_devs[5]; + +static struct resource ar5312_eth0_res[] = { + { + .name = "eth_membase", + .flags = IORESOURCE_MEM, + .start = KSEG1ADDR(AR531X_ENET0), + .end = KSEG1ADDR(AR531X_ENET0 + 0x2000), + }, + { + .name = "eth_irq", + .flags = IORESOURCE_IRQ, + .start = AR531X_IRQ_ENET0_INTRS, + .end = AR531X_IRQ_ENET0_INTRS, + }, +}; + + +static struct resource ar5312_eth1_res[] = { + { + .name = "eth_membase", + .flags = IORESOURCE_MEM, + .start = KSEG1ADDR(AR531X_ENET1), + .end = KSEG1ADDR(AR531X_ENET1 + 0x2000), + }, + { + .name = "eth_irq", + .flags = IORESOURCE_IRQ, + .start = AR531X_IRQ_ENET1_INTRS, + .end = AR531X_IRQ_ENET1_INTRS, + }, +}; + + +static struct ar531x_eth ar5312_eth0_data = { + .phy = 0x1f, + .mac = 0, + .reset_base = AR531X_RESET, + .reset_mac = AR531X_RESET_ENET0, + .reset_phy = AR531X_RESET_EPHY0, +}; + +static struct ar531x_eth ar5312_eth1_data = { + .phy = 0, + .mac = 1, + .reset_base = AR531X_RESET, + .reset_mac = AR531X_RESET_ENET1, + .reset_phy = AR531X_RESET_EPHY1, +}; + +static struct platform_device ar5312_eth[] = { + { + .id = 0, + .name = "ar531x-eth", + .dev.platform_data = &ar5312_eth0_data, + .resource = ar5312_eth0_res, + .num_resources = ARRAY_SIZE(ar5312_eth0_res) + }, + { + .id = 1, + .name = "ar531x-eth", + .dev.platform_data = &ar5312_eth1_data, + .resource = ar5312_eth1_res, + .num_resources = ARRAY_SIZE(ar5312_eth1_res) + }, +}; + +static struct platform_device ar5312_wmac[] = { + { + .id = 0, + .name = "ar531x-wmac", + }, + { + .id = 1, + .name = "ar531x-wmac", + }, +}; + + +static struct physmap_flash_data ar5312_flash_data = { + .width = 2, +}; + +static struct resource ar5312_flash_resource = { + .start = AR531X_FLASH, + .end = AR531X_FLASH + 0x400000 - 1, + .flags = IORESOURCE_MEM, +}; + +static struct platform_device ar5312_physmap_flash = { + .name = "physmap-flash", + .id = 0, + .dev = { + .platform_data = &ar5312_flash_data, + }, + .num_resources = 1, + .resource = &ar5312_flash_resource, +}; + + +/* + * NB: This mapping size is larger than the actual flash size, + * but this shouldn't be a problem here, because the flash + * will simply be mapped multiple times. + */ +static char __init *ar5312_flash_limit(void) +{ + u32 ctl; + /* Configure flash bank 0 */ + ctl = FLASHCTL_E | + FLASHCTL_AC_8M | + FLASHCTL_RBLE | + (0x01 << FLASHCTL_IDCY_S) | + (0x07 << FLASHCTL_WST1_S) | + (0x07 << FLASHCTL_WST2_S) | + (sysRegRead(AR531X_FLASHCTL0) & FLASHCTL_MW); + + sysRegWrite(AR531X_FLASHCTL0, ctl); + + /* Disable other flash banks */ + sysRegWrite(AR531X_FLASHCTL1, + sysRegRead(AR531X_FLASHCTL1) & ~(FLASHCTL_E | FLASHCTL_AC)); + + sysRegWrite(AR531X_FLASHCTL2, + sysRegRead(AR531X_FLASHCTL2) & ~(FLASHCTL_E | FLASHCTL_AC)); + + return (char *) KSEG1ADDR(AR531X_FLASH + 0x400000); +} + +static struct ar531x_config __init *init_wmac(int unit) +{ + struct ar531x_config *config; + + config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL); + config->board = board_config; + config->radio = radio_config; + config->unit = unit; + config->tag = (u_int16_t) ((sysRegRead(AR531X_REV) >> AR531X_REV_WMAC_MIN_S) & AR531X_REV_CHIP); + + return config; +} + +int __init ar5312_init_devices(void) +{ + char *radio; + int dev = 0; + + if (mips_machtype != MACH_ATHEROS_AR5312) + return 0; + + ar531x_find_config(ar5312_flash_limit()); + ar5312_eth0_data.board_config = board_config; + ar5312_eth1_data.board_config = board_config; + ar5312_devs[dev++] = &ar5312_physmap_flash; + ar5312_devs[dev++] = &ar5312_eth[0]; + ar5312_devs[dev++] = &ar5312_eth[1]; + + radio = radio_config + AR531X_RADIO_MASK_OFF; + if (*((u32 *) radio) & AR531X_RADIO0_MASK) { + ar5312_wmac[0].dev.platform_data = init_wmac(0); + ar5312_devs[dev++] = &ar5312_wmac[0]; + } + if (*((u32 *) radio) & AR531X_RADIO1_MASK) { + ar5312_wmac[1].dev.platform_data = init_wmac(1); + ar5312_devs[dev++] = &ar5312_wmac[1]; + } + + return platform_add_devices(ar5312_devs, dev); +} + + +/* + * Called when an interrupt is received, this function + * determines exactly which interrupt it was, and it + * invokes the appropriate handler. + * + * Implicitly, we also define interrupt priority by + * choosing which to dispatch first. + */ +asmlinkage void ar5312_irq_dispatch(void) +{ + int pending = read_c0_status() & read_c0_cause(); + + if (pending & CAUSEF_IP2) + do_IRQ(AR531X_IRQ_WLAN0_INTRS); + else if (pending & CAUSEF_IP3) + do_IRQ(AR531X_IRQ_ENET0_INTRS); + else if (pending & CAUSEF_IP4) + do_IRQ(AR531X_IRQ_ENET1_INTRS); + else if (pending & CAUSEF_IP5) + do_IRQ(AR531X_IRQ_WLAN1_INTRS); + else if (pending & CAUSEF_IP6) { + unsigned int ar531x_misc_intrs = sysRegRead(AR531X_ISR) & sysRegRead(AR531X_IMR); + + if (ar531x_misc_intrs & AR531X_ISR_TIMER) { + do_IRQ(AR531X_MISC_IRQ_TIMER); + (void)sysRegRead(AR531X_TIMER); + } else if (ar531x_misc_intrs & AR531X_ISR_AHBPROC) + do_IRQ(AR531X_MISC_IRQ_AHB_PROC); + else if ((ar531x_misc_intrs & AR531X_ISR_UART0)) + do_IRQ(AR531X_MISC_IRQ_UART0); + else if (ar531x_misc_intrs & AR531X_ISR_WD) + do_IRQ(AR531X_MISC_IRQ_WATCHDOG); + else + do_IRQ(AR531X_MISC_IRQ_NONE); + } else if (pending & CAUSEF_IP7) { + do_IRQ(AR531X_IRQ_CPU_CLOCK); + } + else + do_IRQ(AR531X_IRQ_NONE); +} + +static void ar5312_halt(void) +{ + while (1); +} + +static void ar5312_power_off(void) +{ + ar5312_halt(); +} + + +static void ar5312_restart(char *command) +{ + /* reset the system */ + for(;;) sysRegWrite(AR531X_RESET, AR531X_RESET_SYSTEM); +} + + +/* + * This table is indexed by bits 5..4 of the CLOCKCTL1 register + * to determine the predevisor value. + */ +static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = { + 1, + 2, + 4, + 5 +}; + + +static unsigned int __init ar5312_cpu_frequency(void) +{ + unsigned int result; + unsigned int predivide_mask, predivide_shift; + unsigned int multiplier_mask, multiplier_shift; + unsigned int clockCtl1, preDivideSelect, preDivisor, multiplier; + unsigned int doubler_mask; + unsigned int wisoc_revision; + + /* Trust the bootrom's idea of cpu frequency. */ + if ((result = sysRegRead(AR5312_SCRATCH))) + return result; + + wisoc_revision = (sysRegRead(AR531X_REV) & AR531X_REV_MAJ) >> AR531X_REV_MAJ_S; + if (wisoc_revision == AR531X_REV_MAJ_AR2313) { + predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK; + predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT; + multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK; + multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT; + doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK; + } else { /* AR5312 and AR2312 */ + predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK; + predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT; + multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK; + multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT; + doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK; + } + + /* + * Clocking is derived from a fixed 40MHz input clock. + * + * cpuFreq = InputClock * MULT (where MULT is PLL multiplier) + * sysFreq = cpuFreq / 4 (used for APB clock, serial, + * flash, Timer, Watchdog Timer) + * + * cntFreq = cpuFreq / 2 (use for CPU count/compare) + * + * So, for example, with a PLL multiplier of 5, we have + * + * cpuFreq = 200MHz + * sysFreq = 50MHz + * cntFreq = 100MHz + * + * We compute the CPU frequency, based on PLL settings. + */ + + clockCtl1 = sysRegRead(AR5312_CLOCKCTL1); + preDivideSelect = (clockCtl1 & predivide_mask) >> predivide_shift; + preDivisor = CLOCKCTL1_PREDIVIDE_TABLE[preDivideSelect]; + multiplier = (clockCtl1 & multiplier_mask) >> multiplier_shift; + + if (clockCtl1 & doubler_mask) { + multiplier = multiplier << 1; + } + return (40000000 / preDivisor) * multiplier; +} + +static inline int ar5312_sys_frequency(void) +{ + return ar5312_cpu_frequency() / 4; +} + +static void __init ar5312_time_init(void) +{ + mips_hpt_frequency = ar5312_cpu_frequency() / 2; +} + + +/* Enable the specified AR531X_MISC_IRQ interrupt */ +static void +ar5312_misc_intr_enable(unsigned int irq) +{ + unsigned int imr; + + imr = sysRegRead(AR531X_IMR); + imr |= (1 << (irq - AR531X_MISC_IRQ_BASE - 1)); + sysRegWrite(AR531X_IMR, imr); + sysRegRead(AR531X_IMR); /* flush write buffer */ +} + +/* Disable the specified AR531X_MISC_IRQ interrupt */ +static void +ar5312_misc_intr_disable(unsigned int irq) +{ + unsigned int imr; + + imr = sysRegRead(AR531X_IMR); + imr &= ~(1 << (irq - AR531X_MISC_IRQ_BASE - 1)); + sysRegWrite(AR531X_IMR, imr); + sysRegRead(AR531X_IMR); /* flush write buffer */ +} + +/* Turn on the specified AR531X_MISC_IRQ interrupt */ +static unsigned int +ar5312_misc_intr_startup(unsigned int irq) +{ + ar5312_misc_intr_enable(irq); + return 0; +} + +/* Turn off the specified AR531X_MISC_IRQ interrupt */ +static void +ar5312_misc_intr_shutdown(unsigned int irq) +{ + ar5312_misc_intr_disable(irq); +} + +static void +ar5312_misc_intr_ack(unsigned int irq) +{ + ar5312_misc_intr_disable(irq); +} + +static void +ar5312_misc_intr_end(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) + ar5312_misc_intr_enable(irq); +} + +static struct irq_chip ar5312_misc_intr_controller = { + .typename = "AR5312 misc", + .startup = ar5312_misc_intr_startup, + .shutdown = ar5312_misc_intr_shutdown, + .enable = ar5312_misc_intr_enable, + .disable = ar5312_misc_intr_disable, + .ack = ar5312_misc_intr_ack, + .end = ar5312_misc_intr_end, +}; + +static irqreturn_t ar5312_ahb_proc_handler(int cpl, void *dev_id) +{ + u32 proc1 = sysRegRead(AR531X_PROC1); + u32 procAddr = sysRegRead(AR531X_PROCADDR); /* clears error state */ + u32 dma1 = sysRegRead(AR531X_DMA1); + u32 dmaAddr = sysRegRead(AR531X_DMAADDR); /* clears error state */ + + printk("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n", + procAddr, proc1, dmaAddr, dma1); + + machine_restart("AHB error"); /* Catastrophic failure */ + return IRQ_HANDLED; +} + + +static struct irqaction ar5312_ahb_proc_interrupt = { + .handler = ar5312_ahb_proc_handler, + .flags = SA_INTERRUPT, + .name = "ar5312_ahb_proc_interrupt", +}; + + +static struct irqaction cascade = { + .handler = no_action, + .flags = SA_INTERRUPT, + .name = "cascade", +}; + +void __init ar5312_misc_intr_init(int irq_base) +{ + int i; + + for (i = irq_base; i < irq_base + AR531X_MISC_IRQ_COUNT; i++) { + irq_desc[i].status = IRQ_DISABLED; + irq_desc[i].action = NULL; + irq_desc[i].depth = 1; + irq_desc[i].chip = &ar5312_misc_intr_controller; + } + setup_irq(AR531X_MISC_IRQ_AHB_PROC, &ar5312_ahb_proc_interrupt); + setup_irq(AR531X_IRQ_MISC_INTRS, &cascade); +} + + +void __init ar5312_plat_setup(void) +{ + /* Clear any lingering AHB errors */ + sysRegRead(AR531X_PROCADDR); + sysRegRead(AR531X_DMAADDR); + sysRegWrite(AR531X_WD_CTRL, AR531X_WD_CTRL_IGNORE_EXPIRATION); + + board_time_init = ar5312_time_init; + + _machine_restart = ar5312_restart; + _machine_halt = ar5312_halt; + pm_power_off = ar5312_power_off; + + serial_setup(KSEG1ADDR(AR531X_UART0), ar5312_sys_frequency()); +} + +arch_initcall(ar5312_init_devices); |