diff options
Diffstat (limited to 'arch/m68k/coldfire')
37 files changed, 5563 insertions, 0 deletions
diff --git a/arch/m68k/coldfire/Makefile b/arch/m68k/coldfire/Makefile new file mode 100644 index 000000000000..68f0fac60099 --- /dev/null +++ b/arch/m68k/coldfire/Makefile @@ -0,0 +1,41 @@ +# +# Makefile for the m68knommu kernel. +# + +# +# If you want to play with the HW breakpoints then you will +# need to add define this, which will give you a stack backtrace +# on the console port whenever a DBG interrupt occurs. You have to +# set up you HW breakpoints to trigger a DBG interrupt: +# +# ccflags-y := -DTRAP_DBG_INTERRUPT +# asflags-y := -DTRAP_DBG_INTERRUPT +# + +asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1 + +obj-$(CONFIG_COLDFIRE) += cache.o clk.o device.o dma.o entry.o vectors.o +obj-$(CONFIG_M5206) += m5206.o timers.o intc.o reset.o +obj-$(CONFIG_M5206e) += m5206.o timers.o intc.o reset.o +obj-$(CONFIG_M520x) += m520x.o pit.o intc-simr.o reset.o +obj-$(CONFIG_M523x) += m523x.o pit.o dma_timer.o intc-2.o reset.o +obj-$(CONFIG_M5249) += m5249.o timers.o intc.o intc-5249.o reset.o +obj-$(CONFIG_M525x) += m525x.o timers.o intc.o intc-525x.o reset.o +obj-$(CONFIG_M527x) += m527x.o pit.o intc-2.o reset.o +obj-$(CONFIG_M5272) += m5272.o intc-5272.o timers.o +obj-$(CONFIG_M528x) += m528x.o pit.o intc-2.o reset.o +obj-$(CONFIG_M5307) += m5307.o timers.o intc.o reset.o +obj-$(CONFIG_M53xx) += m53xx.o timers.o intc-simr.o reset.o +obj-$(CONFIG_M5407) += m5407.o timers.o intc.o reset.o +obj-$(CONFIG_M54xx) += m54xx.o sltimers.o intc-2.o +obj-$(CONFIG_M5441x) += m5441x.o pit.o intc-simr.o reset.o + +obj-$(CONFIG_NETtel) += nettel.o +obj-$(CONFIG_CLEOPATRA) += nettel.o +obj-$(CONFIG_FIREBEE) += firebee.o +obj-$(CONFIG_MCF8390) += mcf8390.o + +obj-$(CONFIG_PCI) += pci.o + +obj-y += gpio.o +extra-y := head.o diff --git a/arch/m68k/coldfire/cache.c b/arch/m68k/coldfire/cache.c new file mode 100644 index 000000000000..71beeaf0c5c4 --- /dev/null +++ b/arch/m68k/coldfire/cache.c @@ -0,0 +1,48 @@ +/***************************************************************************/ + +/* + * cache.c -- general ColdFire Cache maintenance code + * + * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com) + */ + +/***************************************************************************/ + +#include <linux/kernel.h> +#include <asm/coldfire.h> +#include <asm/mcfsim.h> + +/***************************************************************************/ +#ifdef CACHE_PUSH +/***************************************************************************/ + +/* + * Use cpushl to push all dirty cache lines back to memory. + * Older versions of GAS don't seem to know how to generate the + * ColdFire cpushl instruction... Oh well, bit stuff it for now. + */ + +void mcf_cache_push(void) +{ + __asm__ __volatile__ ( + "clrl %%d0\n\t" + "1:\n\t" + "movel %%d0,%%a0\n\t" + "2:\n\t" + ".word 0xf468\n\t" + "addl %0,%%a0\n\t" + "cmpl %1,%%a0\n\t" + "blt 2b\n\t" + "addql #1,%%d0\n\t" + "cmpil %2,%%d0\n\t" + "bne 1b\n\t" + : /* No output */ + : "i" (CACHE_LINE_SIZE), + "i" (DCACHE_SIZE / CACHE_WAYS), + "i" (CACHE_WAYS) + : "d0", "a0" ); +} + +/***************************************************************************/ +#endif /* CACHE_PUSH */ +/***************************************************************************/ diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c new file mode 100644 index 000000000000..fddfdccae63b --- /dev/null +++ b/arch/m68k/coldfire/clk.c @@ -0,0 +1,124 @@ +/***************************************************************************/ + +/* + * clk.c -- general ColdFire CPU kernel clk handling + * + * Copyright (C) 2009, Greg Ungerer (gerg@snapgear.com) + */ + +/***************************************************************************/ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/err.h> +#include <asm/coldfire.h> +#include <asm/mcfsim.h> +#include <asm/mcfclk.h> + +static DEFINE_SPINLOCK(clk_lock); + +#ifdef MCFPM_PPMCR0 +/* + * For more advanced ColdFire parts that have clocks that can be enabled + * we supply enable/disable functions. These must properly define their + * clocks in their platform specific code. + */ +void __clk_init_enabled(struct clk *clk) +{ + clk->enabled = 1; + clk->clk_ops->enable(clk); +} + +void __clk_init_disabled(struct clk *clk) +{ + clk->enabled = 0; + clk->clk_ops->disable(clk); +} + +static void __clk_enable0(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMCR0); +} + +static void __clk_disable0(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMSR0); +} + +struct clk_ops clk_ops0 = { + .enable = __clk_enable0, + .disable = __clk_disable0, +}; + +#ifdef MCFPM_PPMCR1 +static void __clk_enable1(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMCR1); +} + +static void __clk_disable1(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMSR1); +} + +struct clk_ops clk_ops1 = { + .enable = __clk_enable1, + .disable = __clk_disable1, +}; +#endif /* MCFPM_PPMCR1 */ +#endif /* MCFPM_PPMCR0 */ + +struct clk *clk_get(struct device *dev, const char *id) +{ + const char *clk_name = dev ? dev_name(dev) : id ? id : NULL; + struct clk *clk; + unsigned i; + + for (i = 0; (clk = mcf_clks[i]) != NULL; ++i) + if (!strcmp(clk->name, clk_name)) + return clk; + pr_warn("clk_get: didn't find clock %s\n", clk_name); + return ERR_PTR(-ENOENT); +} +EXPORT_SYMBOL(clk_get); + +int clk_enable(struct clk *clk) +{ + unsigned long flags; + spin_lock_irqsave(&clk_lock, flags); + if ((clk->enabled++ == 0) && clk->clk_ops) + clk->clk_ops->enable(clk); + spin_unlock_irqrestore(&clk_lock, flags); + + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + unsigned long flags; + spin_lock_irqsave(&clk_lock, flags); + if ((--clk->enabled == 0) && clk->clk_ops) + clk->clk_ops->disable(clk); + spin_unlock_irqrestore(&clk_lock, flags); +} +EXPORT_SYMBOL(clk_disable); + +void clk_put(struct clk *clk) +{ + if (clk->enabled != 0) + pr_warn("clk_put %s still enabled\n", clk->name); +} +EXPORT_SYMBOL(clk_put); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + +/***************************************************************************/ diff --git a/arch/m68k/coldfire/device.c b/arch/m68k/coldfire/device.c new file mode 100644 index 000000000000..71ea4c02795d --- /dev/null +++ b/arch/m68k/coldfire/device.c @@ -0,0 +1,369 @@ +/* + * device.c -- common ColdFire SoC device support + * + * (C) Copyright 2011, Greg Ungerer <gerg@uclinux.org> + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/spi/spi.h> +#include <linux/gpio.h> +#include <linux/fec.h> +#include <asm/traps.h> +#include <asm/coldfire.h> +#include <asm/mcfsim.h> +#include <asm/mcfuart.h> +#include <asm/mcfqspi.h> + +/* + * All current ColdFire parts contain from 2, 3, 4 or 10 UARTS. + */ +static struct mcf_platform_uart mcf_uart_platform_data[] = { + { + .mapbase = MCFUART_BASE0, + .irq = MCF_IRQ_UART0, + }, + { + .mapbase = MCFUART_BASE1, + .irq = MCF_IRQ_UART1, + }, +#ifdef MCFUART_BASE2 + { + .mapbase = MCFUART_BASE2, + .irq = MCF_IRQ_UART2, + }, +#endif +#ifdef MCFUART_BASE3 + { + .mapbase = MCFUART_BASE3, + .irq = MCF_IRQ_UART3, + }, +#endif +#ifdef MCFUART_BASE4 + { + .mapbase = MCFUART_BASE4, + .irq = MCF_IRQ_UART4, + }, +#endif +#ifdef MCFUART_BASE5 + { + .mapbase = MCFUART_BASE5, + .irq = MCF_IRQ_UART5, + }, +#endif +#ifdef MCFUART_BASE6 + { + .mapbase = MCFUART_BASE6, + .irq = MCF_IRQ_UART6, + }, +#endif +#ifdef MCFUART_BASE7 + { + .mapbase = MCFUART_BASE7, + .irq = MCF_IRQ_UART7, + }, +#endif +#ifdef MCFUART_BASE8 + { + .mapbase = MCFUART_BASE8, + .irq = MCF_IRQ_UART8, + }, +#endif +#ifdef MCFUART_BASE9 + { + .mapbase = MCFUART_BASE9, + .irq = MCF_IRQ_UART9, + }, +#endif + { }, +}; + +static struct platform_device mcf_uart = { + .name = "mcfuart", + .id = 0, + .dev.platform_data = mcf_uart_platform_data, +}; + +#ifdef CONFIG_FEC + +#ifdef CONFIG_M5441x +#define FEC_NAME "enet-fec" +static struct fec_platform_data fec_pdata = { + .phy = PHY_INTERFACE_MODE_RMII, +}; +#define FEC_PDATA (&fec_pdata) +#else +#define FEC_NAME "fec" +#define FEC_PDATA NULL +#endif + +/* + * Some ColdFire cores contain the Fast Ethernet Controller (FEC) + * block. It is Freescale's own hardware block. Some ColdFires + * have 2 of these. + */ +static struct resource mcf_fec0_resources[] = { + { + .start = MCFFEC_BASE0, + .end = MCFFEC_BASE0 + MCFFEC_SIZE0 - 1, + .flags = IORESOURCE_MEM, + }, + { + .start = MCF_IRQ_FECRX0, + .end = MCF_IRQ_FECRX0, + .flags = IORESOURCE_IRQ, + }, + { + .start = MCF_IRQ_FECTX0, + .end = MCF_IRQ_FECTX0, + .flags = IORESOURCE_IRQ, + }, + { + .start = MCF_IRQ_FECENTC0, + .end = MCF_IRQ_FECENTC0, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device mcf_fec0 = { + .name = FEC_NAME, + .id = 0, + .num_resources = ARRAY_SIZE(mcf_fec0_resources), + .resource = mcf_fec0_resources, + .dev.platform_data = FEC_PDATA, +}; + +#ifdef MCFFEC_BASE1 +static struct resource mcf_fec1_resources[] = { + { + .start = MCFFEC_BASE1, + .end = MCFFEC_BASE1 + MCFFEC_SIZE1 - 1, + .flags = IORESOURCE_MEM, + }, + { + .start = MCF_IRQ_FECRX1, + .end = MCF_IRQ_FECRX1, + .flags = IORESOURCE_IRQ, + }, + { + .start = MCF_IRQ_FECTX1, + .end = MCF_IRQ_FECTX1, + .flags = IORESOURCE_IRQ, + }, + { + .start = MCF_IRQ_FECENTC1, + .end = MCF_IRQ_FECENTC1, + .flags = IORESOURCE_IRQ, + }, +}; + +static struct platform_device mcf_fec1 = { + .name = FEC_NAME, + .id = 1, + .num_resources = ARRAY_SIZE(mcf_fec1_resources), + .resource = mcf_fec1_resources, + .dev.platform_data = FEC_PDATA, +}; +#endif /* MCFFEC_BASE1 */ +#endif /* CONFIG_FEC */ + +#if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) +/* + * The ColdFire QSPI module is an SPI protocol hardware block used + * on a number of different ColdFire CPUs. + */ +static struct resource mcf_qspi_resources[] = { + { + .start = MCFQSPI_BASE, + .end = MCFQSPI_BASE + MCFQSPI_SIZE - 1, + .flags = IORESOURCE_MEM, + }, + { + .start = MCF_IRQ_QSPI, + .end = MCF_IRQ_QSPI, + .flags = IORESOURCE_IRQ, + }, +}; + +static int mcf_cs_setup(struct mcfqspi_cs_control *cs_control) +{ + int status; + + status = gpio_request(MCFQSPI_CS0, "MCFQSPI_CS0"); + if (status) { + pr_debug("gpio_request for MCFQSPI_CS0 failed\n"); + goto fail0; + } + status = gpio_direction_output(MCFQSPI_CS0, 1); + if (status) { + pr_debug("gpio_direction_output for MCFQSPI_CS0 failed\n"); + goto fail1; + } + + status = gpio_request(MCFQSPI_CS1, "MCFQSPI_CS1"); + if (status) { + pr_debug("gpio_request for MCFQSPI_CS1 failed\n"); + goto fail1; + } + status = gpio_direction_output(MCFQSPI_CS1, 1); + if (status) { + pr_debug("gpio_direction_output for MCFQSPI_CS1 failed\n"); + goto fail2; + } + + status = gpio_request(MCFQSPI_CS2, "MCFQSPI_CS2"); + if (status) { + pr_debug("gpio_request for MCFQSPI_CS2 failed\n"); + goto fail2; + } + status = gpio_direction_output(MCFQSPI_CS2, 1); + if (status) { + pr_debug("gpio_direction_output for MCFQSPI_CS2 failed\n"); + goto fail3; + } + +#ifdef MCFQSPI_CS3 + status = gpio_request(MCFQSPI_CS3, "MCFQSPI_CS3"); + if (status) { + pr_debug("gpio_request for MCFQSPI_CS3 failed\n"); + goto fail3; + } + status = gpio_direction_output(MCFQSPI_CS3, 1); + if (status) { + pr_debug("gpio_direction_output for MCFQSPI_CS3 failed\n"); + gpio_free(MCFQSPI_CS3); + goto fail3; + } +#endif + + return 0; + +fail3: + gpio_free(MCFQSPI_CS2); +fail2: + gpio_free(MCFQSPI_CS1); +fail1: + gpio_free(MCFQSPI_CS0); +fail0: + return status; +} + +static void mcf_cs_teardown(struct mcfqspi_cs_control *cs_control) +{ +#ifdef MCFQSPI_CS3 + gpio_free(MCFQSPI_CS3); +#endif + gpio_free(MCFQSPI_CS2); + gpio_free(MCFQSPI_CS1); + gpio_free(MCFQSPI_CS0); +} + +static void mcf_cs_select(struct mcfqspi_cs_control *cs_control, + u8 chip_select, bool cs_high) +{ + switch (chip_select) { + case 0: + gpio_set_value(MCFQSPI_CS0, cs_high); + break; + case 1: + gpio_set_value(MCFQSPI_CS1, cs_high); + break; + case 2: + gpio_set_value(MCFQSPI_CS2, cs_high); + break; +#ifdef MCFQSPI_CS3 + case 3: + gpio_set_value(MCFQSPI_CS3, cs_high); + break; +#endif + } +} + +static void mcf_cs_deselect(struct mcfqspi_cs_control *cs_control, + u8 chip_select, bool cs_high) +{ + switch (chip_select) { + case 0: + gpio_set_value(MCFQSPI_CS0, !cs_high); + break; + case 1: + gpio_set_value(MCFQSPI_CS1, !cs_high); + break; + case 2: + gpio_set_value(MCFQSPI_CS2, !cs_high); + break; +#ifdef MCFQSPI_CS3 + case 3: + gpio_set_value(MCFQSPI_CS3, !cs_high); + break; +#endif + } +} + +static struct mcfqspi_cs_control mcf_cs_control = { + .setup = mcf_cs_setup, + .teardown = mcf_cs_teardown, + .select = mcf_cs_select, + .deselect = mcf_cs_deselect, +}; + +static struct mcfqspi_platform_data mcf_qspi_data = { + .bus_num = 0, + .num_chipselect = 4, + .cs_control = &mcf_cs_control, +}; + +static struct platform_device mcf_qspi = { + .name = "mcfqspi", + .id = 0, + .num_resources = ARRAY_SIZE(mcf_qspi_resources), + .resource = mcf_qspi_resources, + .dev.platform_data = &mcf_qspi_data, +}; +#endif /* IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) */ + +static struct platform_device *mcf_devices[] __initdata = { + &mcf_uart, +#ifdef CONFIG_FEC + &mcf_fec0, +#ifdef MCFFEC_BASE1 + &mcf_fec1, +#endif +#endif +#if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) + &mcf_qspi, +#endif +}; + +/* + * Some ColdFire UARTs let you set the IRQ line to use. + */ +static void __init mcf_uart_set_irq(void) +{ +#ifdef MCFUART_UIVR + /* UART0 interrupt setup */ + writeb(MCFSIM_ICR_LEVEL6 | MCFSIM_ICR_PRI1, MCFSIM_UART1ICR); + writeb(MCF_IRQ_UART0, MCFUART_BASE0 + MCFUART_UIVR); + mcf_mapirq2imr(MCF_IRQ_UART0, MCFINTC_UART0); + + /* UART1 interrupt setup */ + writeb(MCFSIM_ICR_LEVEL6 | MCFSIM_ICR_PRI2, MCFSIM_UART2ICR); + writeb(MCF_IRQ_UART1, MCFUART_BASE1 + MCFUART_UIVR); + mcf_mapirq2imr(MCF_IRQ_UART1, MCFINTC_UART1); +#endif +} + +static int __init mcf_init_devices(void) +{ + mcf_uart_set_irq(); + platform_add_devices(mcf_devices, ARRAY_SIZE(mcf_devices)); + return 0; +} + +arch_initcall(mcf_init_devices); + diff --git a/arch/m68k/coldfire/dma.c b/arch/m68k/coldfire/dma.c new file mode 100644 index 000000000000..df5ce20d181c --- /dev/null +++ b/arch/m68k/coldfire/dma.c @@ -0,0 +1,42 @@ +/***************************************************************************/ + +/* + * dma.c -- Freescale ColdFire DMA support + * + * Copyright (C) 2007, Greg Ungerer (gerg@snapgear.com) + */ + +/***************************************************************************/ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <asm/dma.h> +#include <asm/coldfire.h> +#include <asm/mcfsim.h> +#include <asm/mcfdma.h> + +/***************************************************************************/ + +/* + * DMA channel base address table. + */ +unsigned int dma_base_addr[MAX_M68K_DMA_CHANNELS] = { +#ifdef MCFDMA_BASE0 + MCFDMA_BASE0, +#endif +#ifdef MCFDMA_BASE1 + MCFDMA_BASE1, +#endif +#ifdef MCFDMA_BASE2 + MCFDMA_BASE2, +#endif +#ifdef MCFDMA_BASE3 + MCFDMA_BASE3, +#endif +}; +EXPORT_SYMBOL(dma_base_addr); + +unsigned int dma_device_address[MAX_M68K_DMA_CHANNELS]; +EXPORT_SYMBOL(dma_device_address); + +/***************************************************************************/ diff --git a/arch/m68k/coldfire/dma_timer.c b/arch/m68k/coldfire/dma_timer.c new file mode 100644 index 000000000000..235ad57c4707 --- /dev/null +++ b/arch/m68k/coldfire/dma_timer.c @@ -0,0 +1,81 @@ +/* + * dma_timer.c -- Freescale ColdFire DMA Timer. + * + * Copyright (C) 2007, Benedikt Spranger <b.spranger@linutronix.de> + * Copyright (C) 2008. Sebastian Siewior, Linutronix + * + */ + +#include <linux/clocksource.h> +#include <linux/io.h> + +#include <asm/machdep.h> +#include <asm/coldfire.h> +#include <asm/mcfpit.h> +#include <asm/mcfsim.h> + +#define DMA_TIMER_0 (0x00) +#define DMA_TIMER_1 (0x40) +#define DMA_TIMER_2 (0x80) +#define DMA_TIMER_3 (0xc0) + +#define DTMR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x400) +#define DTXMR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x402) +#define DTER0 (MCF_IPSBAR + DMA_TIMER_0 + 0x403) +#define DTRR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x404) +#define DTCR0 (MCF_IPSBAR + DMA_TIMER_0 + 0x408) +#define DTCN0 (MCF_IPSBAR + DMA_TIMER_0 + 0x40c) + +#define DMA_FREQ ((MCF_CLK / 2) / 16) + +/* DTMR */ +#define DMA_DTMR_RESTART (1 << 3) +#define DMA_DTMR_CLK_DIV_1 (1 << 1) +#define DMA_DTMR_CLK_DIV_16 (2 << 1) +#define DMA_DTMR_ENABLE (1 << 0) + +static cycle_t cf_dt_get_cycles(struct clocksource *cs) +{ + return __raw_readl(DTCN0); +} + +static struct clocksource clocksource_cf_dt = { + .name = "coldfire_dma_timer", + .rating = 200, + .read = cf_dt_get_cycles, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static int __init init_cf_dt_clocksource(void) +{ + /* + * We setup DMA timer 0 in free run mode. This incrementing counter is + * used as a highly precious clock source. With MCF_CLOCK = 150 MHz we + * get a ~213 ns resolution and the 32bit register will overflow almost + * every 15 minutes. + */ + __raw_writeb(0x00, DTXMR0); + __raw_writeb(0x00, DTER0); + __raw_writel(0x00000000, DTRR0); + __raw_writew(DMA_DTMR_CLK_DIV_16 | DMA_DTMR_ENABLE, DTMR0); + return clocksource_register_hz(&clocksource_cf_dt, DMA_FREQ); +} + +arch_initcall(init_cf_dt_clocksource); + +#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ +#define CYC2NS_SCALE ((1000000 << CYC2NS_SCALE_FACTOR) / (DMA_FREQ / 1000)) + +static unsigned long long cycles2ns(unsigned long cycl) +{ + return (unsigned long long) ((unsigned long long)cycl * + CYC2NS_SCALE) >> CYC2NS_SCALE_FACTOR; +} + +unsigned long long sched_clock(void) +{ + unsigned long cycl = __raw_readl(DTCN0); + + return cycles2ns(cycl); +} diff --git a/arch/m68k/coldfire/entry.S b/arch/m68k/coldfire/entry.S new file mode 100644 index 000000000000..881ab8e379d4 --- /dev/null +++ b/arch/m68k/coldfire/entry.S @@ -0,0 +1,203 @@ +/* + * linux/arch/m68knommu/platform/5307/entry.S + * + * Copyright (C) 1999-2007, Greg Ungerer (gerg@snapgear.com) + * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, + * Kenneth Albanowski <kjahds@kjahds.com>, + * Copyright (C) 2000 Lineo Inc. (www.lineo.com) + * Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com) + * + * Based on: + * + * linux/arch/m68k/kernel/entry.S + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file README.legal in the main directory of this archive + * for more details. + * + * Linux/m68k support by Hamish Macdonald + * + * 68060 fixes by Jesper Skov + * ColdFire support by Greg Ungerer (gerg@snapgear.com) + * 5307 fixes by David W. Miller + * linux 2.4 support David McCullough <davidm@snapgear.com> + * Bug, speed and maintainability fixes by Philippe De Muyter <phdm@macqel.be> + */ + +#include <linux/linkage.h> +#include <asm/unistd.h> +#include <asm/thread_info.h> +#include <asm/errno.h> +#include <asm/setup.h> +#include <asm/segment.h> +#include <asm/asm-offsets.h> +#include <asm/entry.h> + +#ifdef CONFIG_COLDFIRE_SW_A7 +/* + * Define software copies of the supervisor and user stack pointers. + */ +.bss +sw_ksp: +.long 0 +sw_usp: +.long 0 +#endif /* CONFIG_COLDFIRE_SW_A7 */ + +.text + +.globl system_call +.globl resume +.globl ret_from_exception +.globl ret_from_signal +.globl sys_call_table +.globl inthandler + +enosys: + mov.l #sys_ni_syscall,%d3 + bra 1f + +ENTRY(system_call) + SAVE_ALL_SYS + move #0x2000,%sr /* enable intrs again */ + GET_CURRENT(%d2) + + cmpl #NR_syscalls,%d0 + jcc enosys + lea sys_call_table,%a0 + lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */ + movel %a0@(%d0),%d3 + jeq enosys + +1: + movel %sp,%d2 /* get thread_info pointer */ + andl #-THREAD_SIZE,%d2 /* at start of kernel stack */ + movel %d2,%a0 + movel %a0@,%a1 /* save top of frame */ + movel %sp,%a1@(TASK_THREAD+THREAD_ESP0) + btst #(TIF_SYSCALL_TRACE%8),%a0@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8) + bnes 1f + + movel %d3,%a0 + jbsr %a0@ + movel %d0,%sp@(PT_OFF_D0) /* save the return value */ + jra ret_from_exception +1: + movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */ + movel %d2,PT_OFF_D0(%sp) /* on syscall entry */ + subql #4,%sp + SAVE_SWITCH_STACK + jbsr syscall_trace_enter + RESTORE_SWITCH_STACK + addql #4,%sp + movel %d3,%a0 + jbsr %a0@ + movel %d0,%sp@(PT_OFF_D0) /* save the return value */ + subql #4,%sp /* dummy return address */ + SAVE_SWITCH_STACK + jbsr syscall_trace_leave + +ret_from_signal: + RESTORE_SWITCH_STACK + addql #4,%sp + +ret_from_exception: + move #0x2700,%sr /* disable intrs */ + btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */ + jeq Luser_return /* if so, skip resched, signals */ + +#ifdef CONFIG_PREEMPT + movel %sp,%d1 /* get thread_info pointer */ + andl #-THREAD_SIZE,%d1 /* at base of kernel stack */ + movel %d1,%a0 + movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ + andl #(1<<TIF_NEED_RESCHED),%d1 + jeq Lkernel_return + + movel %a0@(TINFO_PREEMPT),%d1 + cmpl #0,%d1 + jne Lkernel_return + + pea Lkernel_return + jmp preempt_schedule_irq /* preempt the kernel */ +#endif + +Lkernel_return: + moveml %sp@,%d1-%d5/%a0-%a2 + lea %sp@(32),%sp /* space for 8 regs */ + movel %sp@+,%d0 + addql #4,%sp /* orig d0 */ + addl %sp@+,%sp /* stk adj */ + rte + +Luser_return: + movel %sp,%d1 /* get thread_info pointer */ + andl #-THREAD_SIZE,%d1 /* at base of kernel stack */ + movel %d1,%a0 + moveb %a0@(TINFO_FLAGS+3),%d1 /* thread_info->flags (low 8 bits) */ + jne Lwork_to_do /* still work to do */ + +Lreturn: + RESTORE_USER + +Lwork_to_do: + movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ + move #0x2000,%sr /* enable intrs again */ + btst #TIF_NEED_RESCHED,%d1 + jne reschedule + +Lsignal_return: + subql #4,%sp /* dummy return address */ + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jsr do_notify_resume + addql #4,%sp + RESTORE_SWITCH_STACK + addql #4,%sp + jmp Luser_return + +/* + * This is the generic interrupt handler (for all hardware interrupt + * sources). Calls up to high level code to do all the work. + */ +ENTRY(inthandler) + SAVE_ALL_INT + GET_CURRENT(%d2) + + movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */ + andl #0x03fc,%d0 /* mask out vector only */ + + movel %sp,%sp@- /* push regs arg */ + lsrl #2,%d0 /* calculate real vector # */ + movel %d0,%sp@- /* push vector number */ + jbsr do_IRQ /* call high level irq handler */ + lea %sp@(8),%sp /* pop args off stack */ + + bra ret_from_exception + +/* + * Beware - when entering resume, prev (the current task) is + * in a0, next (the new task) is in a1, so don't change these + * registers until their contents are no longer needed. + */ +ENTRY(resume) + movew %sr,%d1 /* save current status */ + movew %d1,%a0@(TASK_THREAD+THREAD_SR) + movel %a0,%d1 /* get prev thread in d1 */ + SAVE_SWITCH_STACK + movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */ + RDUSP /* movel %usp,%a3 */ + movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */ +#ifdef CONFIG_MMU + movel %a1,%a2 /* set new current */ +#endif + movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */ + WRUSP /* movel %a3,%usp */ + movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */ + movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */ + movew %d7,%sr + RESTORE_SWITCH_STACK + rts + diff --git a/arch/m68k/coldfire/f |