From 76c376d82a9bb487024875ad8a9985b078428ca0 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sun, 4 Feb 2007 21:18:10 +0000 Subject: update atheros 2.6 port - add support for the older chip generation SVN-Revision: 6265 --- .../atheros-2.6/files/arch/mips/atheros/ar5315.c | 529 +++++++++++++++++++++ 1 file changed, 529 insertions(+) create mode 100644 target/linux/atheros-2.6/files/arch/mips/atheros/ar5315.c (limited to 'target/linux/atheros-2.6/files/arch/mips/atheros/ar5315.c') diff --git a/target/linux/atheros-2.6/files/arch/mips/atheros/ar5315.c b/target/linux/atheros-2.6/files/arch/mips/atheros/ar5315.c new file mode 100644 index 0000000000..78b2835914 --- /dev/null +++ b/target/linux/atheros-2.6/files/arch/mips/atheros/ar5315.c @@ -0,0 +1,529 @@ +/* + * 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 + * Copyright (C) 2006 Felix Fietkau + */ + +/* + * Platform devices for Atheros SoCs + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ar531x.h" + +#define AR531X_IRQ_MISC_INTRS MIPS_CPU_IRQ_BASE+2 /* C0_CAUSE: 0x0400 */ +#define AR531X_IRQ_WLAN0_INTRS MIPS_CPU_IRQ_BASE+3 /* C0_CAUSE: 0x0800 */ +#define AR531X_IRQ_ENET0_INTRS MIPS_CPU_IRQ_BASE+4 /* C0_CAUSE: 0x1000 */ +#define AR531X_IRQ_LCBUS_PCI MIPS_CPU_IRQ_BASE+5 /* C0_CAUSE: 0x2000 */ +#define AR531X_IRQ_WLAN0_POLL MIPS_CPU_IRQ_BASE+6 /* C0_CAUSE: 0x4000 */ + +static struct resource ar5315_eth_res[] = { + { + .name = "eth_membase", + .flags = IORESOURCE_MEM, + .start = AR5315_ENET0, + .end = AR5315_ENET0 + 0x2000, + }, + { + .name = "eth_irq", + .flags = IORESOURCE_IRQ, + .start = AR531X_IRQ_ENET0_INTRS, + .end = AR531X_IRQ_ENET0_INTRS, + }, +}; + +static struct ar531x_eth ar5315_eth_data = { + .phy = 1, + .mac = 0, + .reset_base = AR5315_RESET, + .reset_mac = AR5315_RESET_ENET0, + .reset_phy = AR5315_RESET_EPHY0, +}; + +static struct platform_device ar5315_eth = { + .id = 0, + .name = "ar531x-eth", + .dev.platform_data = &ar5315_eth_data, + .resource = ar5315_eth_res, + .num_resources = ARRAY_SIZE(ar5315_eth_res) +}; + +static struct platform_device ar5315_wmac = { + .id = 0, + .name = "ar531x-wmac", + /* FIXME: add resources */ +}; + +static struct resource ar5315_spiflash_res[] = { + { + .name = "flash_base", + .flags = IORESOURCE_MEM, + .start = KSEG1ADDR(AR5315_SPI_READ), + .end = KSEG1ADDR(AR5315_SPI_READ) + 0x800000, + }, + { + .name = "flash_regs", + .flags = IORESOURCE_MEM, + .start = 0x11300000, + .end = 0x11300012, + }, +}; + +static struct platform_device ar5315_spiflash = { + .id = 0, + .name = "spiflash", + .resource = ar5315_spiflash_res, + .num_resources = ARRAY_SIZE(ar5315_spiflash_res) +}; + +static __initdata struct platform_device *ar5315_devs[4]; + + + +static void *flash_regs; + +static inline __u32 spiflash_regread32(int reg) +{ + volatile __u32 *data = (__u32 *)(flash_regs + reg); + + return (*data); +} + +static inline void spiflash_regwrite32(int reg, __u32 data) +{ + volatile __u32 *addr = (__u32 *)(flash_regs + reg); + + *addr = data; +} + +#define SPI_FLASH_CTL 0x00 +#define SPI_FLASH_OPCODE 0x04 +#define SPI_FLASH_DATA 0x08 + +static __u8 spiflash_probe(void) +{ + __u32 reg; + + do { + reg = spiflash_regread32(SPI_FLASH_CTL); + } while (reg & SPI_CTL_BUSY); + + spiflash_regwrite32(SPI_FLASH_OPCODE, 0xab); + + reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | 4 | + (1 << 4) | SPI_CTL_START; + + spiflash_regwrite32(SPI_FLASH_CTL, reg); + + do { + reg = spiflash_regread32(SPI_FLASH_CTL); + } while (reg & SPI_CTL_BUSY); + + reg = (__u32) spiflash_regread32(SPI_FLASH_DATA); + reg &= 0xff; + + return (u8) reg; +} + + +#define STM_8MBIT_SIGNATURE 0x13 +#define STM_16MBIT_SIGNATURE 0x14 +#define STM_32MBIT_SIGNATURE 0x15 +#define STM_64MBIT_SIGNATURE 0x16 + + +static char __init *ar5315_flash_limit(void) +{ + u8 sig; + u32 flash_size = 0; + + /* probe the flash chip size */ + flash_regs = ioremap_nocache(ar5315_spiflash_res[1].start, ar5315_spiflash_res[1].end - ar5315_spiflash_res[1].start); + sig = spiflash_probe(); + iounmap(flash_regs); + + switch(sig) { + case STM_8MBIT_SIGNATURE: + flash_size = 0x00100000; + break; + case STM_16MBIT_SIGNATURE: + flash_size = 0x00200000; + break; + case STM_32MBIT_SIGNATURE: + flash_size = 0x00400000; + break; + case STM_64MBIT_SIGNATURE: + flash_size = 0x00800000; + break; + } + + ar5315_spiflash_res[0].end = ar5315_spiflash_res[0].start + flash_size; + return (char *) ar5315_spiflash_res[0].end; +} + +int __init ar5315_init_devices(void) +{ + struct ar531x_config *config; + int dev = 0; + + if (mips_machtype != MACH_ATHEROS_AR5315) + return 0; + + ar531x_find_config(ar5315_flash_limit()); + + config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL); + config->board = board_config; + config->radio = radio_config; + config->unit = 0; + config->tag = (u_int16_t) (sysRegRead(AR5315_SREV) & REV_CHIP); + + ar5315_eth_data.board_config = board_config; + ar5315_wmac.dev.platform_data = config; + + ar5315_devs[dev++] = &ar5315_eth; + ar5315_devs[dev++] = &ar5315_wmac; + ar5315_devs[dev++] = &ar5315_spiflash; + + return platform_add_devices(ar5315_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 ar5315_irq_dispatch(void) +{ + int pending = read_c0_status() & read_c0_cause(); + + if (pending & CAUSEF_IP3) + do_IRQ(AR531X_IRQ_WLAN0_INTRS); + else if (pending & CAUSEF_IP4) + do_IRQ(AR531X_IRQ_ENET0_INTRS); + else if (pending & CAUSEF_IP2) { + unsigned int ar531x_misc_intrs = sysRegRead(AR5315_ISR) & sysRegRead(AR5315_IMR); + + if (ar531x_misc_intrs & AR5315_ISR_TIMER) + do_IRQ(AR531X_MISC_IRQ_TIMER); + else if (ar531x_misc_intrs & AR5315_ISR_AHB) + do_IRQ(AR531X_MISC_IRQ_AHB_PROC); + else if (ar531x_misc_intrs & AR5315_ISR_GPIO) { + sysRegWrite(AR5315_ISR, sysRegRead(AR5315_IMR) | ~AR5315_ISR_GPIO); + } else if (ar531x_misc_intrs & AR5315_ISR_UART0) + do_IRQ(AR531X_MISC_IRQ_UART0); + else if (ar531x_misc_intrs & AR5315_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 ar5315_halt(void) +{ + while (1); +} + +static void ar5315_power_off(void) +{ + ar5315_halt(); +} + + +static void ar5315_restart(char *command) +{ + unsigned int reg; + for(;;) { + + /* reset the system */ + sysRegWrite(AR5315_COLD_RESET,AR5317_RESET_SYSTEM); + + /* + * Cold reset does not work on the AR2315/6, use the GPIO reset bits a workaround. + */ + + reg = sysRegRead(AR5315_GPIO_DO); + reg &= ~(1 << AR5315_RESET_GPIO); + sysRegWrite(AR5315_GPIO_DO, reg); + (void)sysRegRead(AR5315_GPIO_DO); /* flush write to hardware */ + } +} + + +/* + * 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 int __initdata PLLC_DIVIDE_TABLE[5] = { + 2, + 3, + 4, + 6, + 3 +}; + +static unsigned int __init +ar5315_sys_clk(unsigned int clockCtl) +{ + unsigned int pllcCtrl,cpuDiv; + unsigned int pllcOut,refdiv,fdiv,divby2; + unsigned int clkDiv; + + pllcCtrl = sysRegRead(AR5315_PLLC_CTL); + refdiv = (pllcCtrl & PLLC_REF_DIV_M) >> PLLC_REF_DIV_S; + refdiv = CLOCKCTL1_PREDIVIDE_TABLE[refdiv]; + fdiv = (pllcCtrl & PLLC_FDBACK_DIV_M) >> PLLC_FDBACK_DIV_S; + divby2 = (pllcCtrl & PLLC_ADD_FDBACK_DIV_M) >> PLLC_ADD_FDBACK_DIV_S; + divby2 += 1; + pllcOut = (40000000/refdiv)*(2*divby2)*fdiv; + + + /* clkm input selected */ + switch(clockCtl & CPUCLK_CLK_SEL_M) { + case 0: + case 1: + clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKM_DIV_M) >> PLLC_CLKM_DIV_S]; + break; + case 2: + clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKC_DIV_M) >> PLLC_CLKC_DIV_S]; + break; + default: + pllcOut = 40000000; + clkDiv = 1; + break; + } + cpuDiv = (clockCtl & CPUCLK_CLK_DIV_M) >> CPUCLK_CLK_DIV_S; + cpuDiv = cpuDiv * 2 ?: 1; + return (pllcOut/(clkDiv * cpuDiv)); +} + +static inline unsigned int ar5315_cpu_frequency(void) +{ + return ar5315_sys_clk(sysRegRead(AR5315_CPUCLK)); +} + +static inline unsigned int ar5315_apb_frequency(void) +{ + return ar5315_sys_clk(sysRegRead(AR5315_AMBACLK)); +} + +static void __init ar5315_time_init(void) +{ + mips_hpt_frequency = ar5315_cpu_frequency() / 2; +} + + + +/* Enable the specified AR531X_MISC_IRQ interrupt */ +static void +ar5315_misc_intr_enable(unsigned int irq) +{ + unsigned int imr; + + imr = sysRegRead(AR5315_IMR); + switch(irq) + { + case AR531X_MISC_IRQ_TIMER: + imr |= AR5315_ISR_TIMER; + break; + + case AR531X_MISC_IRQ_AHB_PROC: + imr |= AR5315_ISR_AHB; + break; + + case AR531X_MISC_IRQ_AHB_DMA: + imr |= 0/* ?? */; + break; + + case AR531X_MISC_IRQ_GPIO: + imr |= AR5315_ISR_GPIO; + break; + + case AR531X_MISC_IRQ_UART0: + imr |= AR5315_ISR_UART0; + break; + + + case AR531X_MISC_IRQ_WATCHDOG: + imr |= AR5315_ISR_WD; + break; + + case AR531X_MISC_IRQ_LOCAL: + imr |= 0/* ?? */; + break; + + } + sysRegWrite(AR5315_IMR, imr); + imr=sysRegRead(AR5315_IMR); /* flush write buffer */ + //printk("enable Interrupt irq 0x%x imr 0x%x \n",irq,imr); + +} + +/* Disable the specified AR531X_MISC_IRQ interrupt */ +static void +ar5315_misc_intr_disable(unsigned int irq) +{ + unsigned int imr; + + imr = sysRegRead(AR5315_IMR); + switch(irq) + { + case AR531X_MISC_IRQ_TIMER: + imr &= (~AR5315_ISR_TIMER); + break; + + case AR531X_MISC_IRQ_AHB_PROC: + imr &= (~AR5315_ISR_AHB); + break; + + case AR531X_MISC_IRQ_AHB_DMA: + imr &= 0/* ?? */; + break; + + case AR531X_MISC_IRQ_GPIO: + imr &= ~AR5315_ISR_GPIO; + break; + + case AR531X_MISC_IRQ_UART0: + imr &= (~AR5315_ISR_UART0); + break; + + case AR531X_MISC_IRQ_WATCHDOG: + imr &= (~AR5315_ISR_WD); + break; + + case AR531X_MISC_IRQ_LOCAL: + imr &= ~0/* ?? */; + break; + + } + sysRegWrite(AR5315_IMR, imr); + sysRegRead(AR5315_IMR); /* flush write buffer */ +} + +/* Turn on the specified AR531X_MISC_IRQ interrupt */ +static unsigned int +ar5315_misc_intr_startup(unsigned int irq) +{ + ar5315_misc_intr_enable(irq); + return 0; +} + +/* Turn off the specified AR531X_MISC_IRQ interrupt */ +static void +ar5315_misc_intr_shutdown(unsigned int irq) +{ + ar5315_misc_intr_disable(irq); +} + +static void +ar5315_misc_intr_ack(unsigned int irq) +{ + ar5315_misc_intr_disable(irq); +} + +static void +ar5315_misc_intr_end(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) + ar5315_misc_intr_enable(irq); +} + +static struct irq_chip ar5315_misc_intr_controller = { + .typename = "AR5315 misc", + .startup = ar5315_misc_intr_startup, + .shutdown = ar5315_misc_intr_shutdown, + .enable = ar5315_misc_intr_enable, + .disable = ar5315_misc_intr_disable, + .ack = ar5315_misc_intr_ack, + .end = ar5315_misc_intr_end, +}; + +static irqreturn_t ar5315_ahb_proc_handler(int cpl, void *dev_id) +{ + sysRegWrite(AR5315_AHB_ERR0,AHB_ERROR_DET); + sysRegRead(AR5315_AHB_ERR1); + + printk("AHB fatal error\n"); + machine_restart("AHB error"); /* Catastrophic failure */ + + return IRQ_HANDLED; +} + +static struct irqaction ar5315_ahb_proc_interrupt = { + .handler = ar5315_ahb_proc_handler, + .flags = SA_INTERRUPT, + .name = "ar5315_ahb_proc_interrupt", +}; + + +static struct irqaction cascade = { + .handler = no_action, + .flags = SA_INTERRUPT, + .name = "cascade", +}; + +void ar5315_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 = &ar5315_misc_intr_controller; + } + setup_irq(AR531X_MISC_IRQ_AHB_PROC, &ar5315_ahb_proc_interrupt); + setup_irq(AR531X_IRQ_MISC_INTRS, &cascade); +} + +void __init ar5315_plat_setup(void) +{ + unsigned int config = read_c0_config(); + + /* Clear any lingering AHB errors */ + write_c0_config(config & ~0x3); + sysRegWrite(AR5315_AHB_ERR0,AHB_ERROR_DET); + sysRegRead(AR5315_AHB_ERR1); + sysRegWrite(AR5315_WDC, WDC_IGNORE_EXPIRATION); + + board_time_init = ar5315_time_init; + + _machine_restart = ar5315_restart; + _machine_halt = ar5315_halt; + pm_power_off = ar5315_power_off; + + serial_setup(KSEG1ADDR(AR5315_UART0), ar5315_apb_frequency()); +} + +arch_initcall(ar5315_init_devices); -- cgit v1.2.3