diff options
| -rw-r--r-- | arch/arm/mach-ux500/Kconfig | 15 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/Makefile | 8 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/board-mop500.c | 158 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/cpu-u8500.c | 64 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/headsmp.S | 38 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/debug-macro.S | 19 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/entry-macro.S | 89 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/memory.h | 18 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/setup.h | 23 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/smp.h | 32 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/system.h | 25 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/timex.h | 6 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/uncompress.h | 58 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/include/mach/vmalloc.h | 18 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/localtimer.c | 28 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/platsmp.c | 177 |
16 files changed, 776 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/Kconfig b/arch/arm/mach-ux500/Kconfig new file mode 100644 index 00000000000..03625d74485 --- /dev/null +++ b/arch/arm/mach-ux500/Kconfig @@ -0,0 +1,15 @@ +menu "ST-Ericsson platform type" + depends on ARCH_U8500 + +comment "ST-Ericsson Multicore Mobile Platforms" + +config MACH_U8500_MOP + bool "U8500 Early Development platform" + default y + select ARM_GIC + select HAS_MTU + help + Include support for mop500 development platform + based on U8500 architecture. The platform is based + on early drop silicon version of 8500. +endmenu diff --git a/arch/arm/mach-ux500/Makefile b/arch/arm/mach-ux500/Makefile new file mode 100644 index 00000000000..95e6e24c004 --- /dev/null +++ b/arch/arm/mach-ux500/Makefile @@ -0,0 +1,8 @@ +# +# Makefile for the linux kernel, U8500 machine. +# + +obj-y := clock.o +obj-$(CONFIG_ARCH_U8500) += cpu-u8500.o +obj-$(CONFIG_MACH_U8500_MOP) += board-mop500.o +obj-$(CONFIG_SMP) += platsmp.o headsmp.o localtimer.o diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c new file mode 100644 index 00000000000..aa5afbcc90f --- /dev/null +++ b/arch/arm/mach-ux500/board-mop500.c @@ -0,0 +1,158 @@ +/* + * Copyright (C) 2008-2009 ST-Ericsson + * + * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/amba/bus.h> +#include <linux/amba/pl022.h> +#include <linux/spi/spi.h> + +#include <asm/localtimer.h> +#include <asm/mach-types.h> +#include <asm/mach/arch.h> + +#include <plat/mtu.h> + +#include <mach/hardware.h> +#include <mach/setup.h> + +#define __MEM_4K_RESOURCE(x) \ + .res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM} + +/* These are active devices on this board */ +static struct amba_device uart0_device = { + .dev = { .init_name = "uart0" }, + __MEM_4K_RESOURCE(U8500_UART0_BASE), + .irq = {IRQ_UART0, NO_IRQ}, +}; + +static struct amba_device uart1_device = { + .dev = { .init_name = "uart1" }, + __MEM_4K_RESOURCE(U8500_UART1_BASE), + .irq = {IRQ_UART1, NO_IRQ}, +}; + +static struct amba_device uart2_device = { + .dev = { .init_name = "uart2" }, + __MEM_4K_RESOURCE(U8500_UART2_BASE), + .irq = {IRQ_UART2, NO_IRQ}, +}; + +static void ab4500_spi_cs_control(u32 command) +{ + /* set the FRM signal, which is CS - TODO */ +} + +struct pl022_config_chip ab4500_chip_info = { + .lbm = LOOPBACK_DISABLED, + .com_mode = INTERRUPT_TRANSFER, + .iface = SSP_INTERFACE_MOTOROLA_SPI, + /* we can act as master only */ + .hierarchy = SSP_MASTER, + .slave_tx_disable = 0, + .endian_rx = SSP_RX_MSB, + .endian_tx = SSP_TX_MSB, + .data_size = SSP_DATA_BITS_24, + .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM, + .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC, + .clk_phase = SSP_CLK_SECOND_EDGE, + .clk_pol = SSP_CLK_POL_IDLE_HIGH, + .cs_control = ab4500_spi_cs_control, +}; + +static struct spi_board_info u8500_spi_devices[] = { + { + .modalias = "ab4500", + .controller_data = &ab4500_chip_info, + .max_speed_hz = 12000000, + .bus_num = 0, + .chip_select = 0, + .mode = SPI_MODE_0, + .irq = IRQ_AB4500, + }, +}; + +static struct pl022_ssp_controller ssp0_platform_data = { + .bus_id = 0, + /* pl022 not yet supports dma */ + .enable_dma = 0, + /* on this platform, gpio 31,142,144,214 & + * 224 are connected as chip selects + */ + .num_chipselect = 5, +}; + +static struct amba_device pl022_device = { + .dev = { + .coherent_dma_mask = ~0, + .init_name = "pl022", + .platform_data = &ssp0_platform_data, + }, + .res = { + .start = U8500_SSP0_BASE, + .end = U8500_SSP0_BASE + SZ_4K - 1, + .flags = IORESOURCE_MEM, + }, + .irq = {IRQ_SSP0, NO_IRQ }, + /* ST-Ericsson modified id */ + .periphid = SSP_PER_ID, +}; + +static struct amba_device *amba_devs[] __initdata = { + &uart0_device, + &uart1_device, + &uart2_device, + &pl022_device, +}; + +static void __init u8500_timer_init(void) +{ +#ifdef CONFIG_LOCAL_TIMERS + /* Setup the local timer base */ + twd_base = __io_address(U8500_TWD_BASE); +#endif + /* Setup the MTU base */ + mtu_base = __io_address(U8500_MTU0_BASE); + + nmdk_timer_init(); +} + +static struct sys_timer u8500_timer = { + .init = u8500_timer_init, +}; + +static void __init u8500_init_machine(void) +{ + int i; + + /* Register the active AMBA devices on this board */ + for (i = 0; i < ARRAY_SIZE(amba_devs); i++) + amba_device_register(amba_devs[i], &iomem_resource); + + spi_register_board_info(u8500_spi_devices, + ARRAY_SIZE(u8500_spi_devices)); + + u8500_init_devices(); +} + +MACHINE_START(U8500, "ST-Ericsson MOP500 platform") + /* Maintainer: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> */ + .phys_io = U8500_UART2_BASE, + .io_pg_offst = (IO_ADDRESS(U8500_UART2_BASE) >> 18) & 0xfffc, + .boot_params = 0x100, + .map_io = u8500_map_io, + .init_irq = u8500_init_irq, + /* we re-use nomadik timer here */ + .timer = &u8500_timer, + .init_machine = u8500_init_machine, +MACHINE_END diff --git a/arch/arm/mach-ux500/cpu-u8500.c b/arch/arm/mach-ux500/cpu-u8500.c new file mode 100644 index 00000000000..5f05e5850f7 --- /dev/null +++ b/arch/arm/mach-ux500/cpu-u8500.c @@ -0,0 +1,64 @@ +/* + * Copyright (C) 2008-2009 ST-Ericsson + * + * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/amba/bus.h> +#include <linux/irq.h> +#include <linux/platform_device.h> + +#include <asm/hardware/gic.h> +#include <asm/mach/map.h> +#include <mach/hardware.h> + +/* add any platform devices here - TODO */ +static struct platform_device *platform_devs[] __initdata = { + /* yet to be added, add i2c0, gpio.. */ +}; + +#define __IO_DEV_DESC(x, sz) { \ + .virtual = IO_ADDRESS(x), \ + .pfn = __phys_to_pfn(x), \ + .length = sz, \ + .type = MT_DEVICE, \ +} + +/* minimum static i/o mapping required to boot U8500 platforms */ +static struct map_desc u8500_io_desc[] __initdata = { + __IO_DEV_DESC(U8500_GIC_CPU_BASE, SZ_4K), + __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K), + __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K), + __IO_DEV_DESC(U8500_TWD_BASE, SZ_4K), + __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K), + __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K), +}; + +void __init u8500_map_io(void) +{ + iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc)); +} + +void __init u8500_init_irq(void) +{ + gic_dist_init(0, __io_address(U8500_GIC_DIST_BASE), 29); + gic_cpu_init(0, __io_address(U8500_GIC_CPU_BASE)); +} + +/* + * This function is called from the board init + */ +void __init u8500_init_devices(void) +{ + /* Register the platform devices */ + platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs)); + + return ; +} diff --git a/arch/arm/mach-ux500/headsmp.S b/arch/arm/mach-ux500/headsmp.S new file mode 100644 index 00000000000..a6be2cdf2b2 --- /dev/null +++ b/arch/arm/mach-ux500/headsmp.S @@ -0,0 +1,38 @@ +/* + * Copyright (c) 2009 ST-Ericsson + * This file is based ARM Realview platform + * Copyright (c) 2003 ARM Limited + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/linkage.h> +#include <linux/init.h> + + __INIT + +/* + * U8500 specific entry point for secondary CPUs. + */ +ENTRY(u8500_secondary_startup) + mrc p15, 0, r0, c0, c0, 5 + and r0, r0, #15 + adr r4, 1f + ldmia r4, {r5, r6} + sub r4, r4, r5 + add r6, r6, r4 + dsb +pen: ldr r7, [r6] + cmp r7, r0 + bne pen + + /* + * we've been released from the holding pen: secondary_stack + * should now contain the SVC stack for this core + */ + b secondary_startup + +1: .long . + .long pen_release diff --git a/arch/arm/mach-ux500/include/mach/debug-macro.S b/arch/arm/mach-ux500/include/mach/debug-macro.S new file mode 100644 index 00000000000..8f21b6a95dc --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/debug-macro.S @@ -0,0 +1,19 @@ +/* + * Debugging macro include header + * + * Copyright (C) 2009 ST-Ericsson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + .macro addruart,rx + mrc p15, 0, \rx, c1, c0 + tst \rx, #1 @MMU enabled? + moveq \rx, #0x80000000 @MMU off, Physical address + movne \rx, #0xF0000000 @MMU on, Virtual address + orr \rx, \rx, #0x7000 + .endm + +#include <asm/hardware/debug-pl01x.S> diff --git a/arch/arm/mach-ux500/include/mach/entry-macro.S b/arch/arm/mach-ux500/include/mach/entry-macro.S new file mode 100644 index 00000000000..eece3301fef --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/entry-macro.S @@ -0,0 +1,89 @@ +/* + * Low-level IRQ helper macros for U8500 platforms + * + * Copyright (C) 2009 ST-Ericsson. + * + * This file is a copy of ARM Realview platform. + * -just satisfied checkpatch script. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ +#include <mach/hardware.h> +#include <asm/hardware/gic.h> + + .macro disable_fiq + .endm + + .macro get_irqnr_preamble, base, tmp + ldr \base, =IO_ADDRESS(U8500_GIC_CPU_BASE) + .endm + + .macro arch_ret_to_user, tmp1, tmp2 + .endm + + /* + * The interrupt numbering scheme is defined in the + * interrupt controller spec. To wit: + * + * Interrupts 0-15 are IPI + * 16-28 are reserved + * 29-31 are local. We allow 30 to be used for the watchdog. + * 32-1020 are global + * 1021-1022 are reserved + * 1023 is "spurious" (no interrupt) + * + * For now, we ignore all local interrupts so only return an + * interrupt if it's between 30 and 1020. The test_for_ipi + * routine below will pick up on IPIs. + * + * A simple read from the controller will tell us the number + * of the highest priority enabled interrupt. We then just + * need to check whether it is in the valid range for an + * IRQ (30-1020 inclusive). + */ + + .macro get_irqnr_and_base, irqnr, irqstat, base, tmp + + /* bits 12-10 = src CPU, 9-0 = int # */ + ldr \irqstat, [\base, #GIC_CPU_INTACK] + + ldr \tmp, =1021 + + bic \irqnr, \irqstat, #0x1c00 + + cmp \irqnr, #29 + cmpcc \irqnr, \irqnr + cmpne \irqnr, \tmp + cmpcs \irqnr, \irqnr + + .endm + + /* We assume that irqstat (the raw value of the IRQ + * acknowledge register) is preserved from the macro above. + * If there is an IPI, we immediately signal end of + * interrupt on the controller, since this requires the + * original irqstat value which we won't easily be able + * to recreate later. + */ + + .macro test_for_ipi, irqnr, irqstat, base, tmp + bic \irqnr, \irqstat, #0x1c00 + cmp \irqnr, #16 + strcc \irqstat, [\base, #GIC_CPU_EOI] + cmpcs \irqnr, \irqnr + .endm + + /* As above, this assumes that irqstat and base + * are preserved.. + */ + + .macro test_for_ltirq, irqnr, irqstat, base, tmp + bic \irqnr, \irqstat, #0x1c00 + mov \tmp, #0 + cmp \irqnr, #29 + moveq \tmp, #1 + streq \irqstat, [\base, #GIC_CPU_EOI] + cmp \tmp, #0 + .endm diff --git a/arch/arm/mach-ux500/include/mach/memory.h b/arch/arm/mach-ux500/include/mach/memory.h new file mode 100644 index 00000000000..510571a59e2 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/memory.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2009 ST-Ericsson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#ifndef __ASM_ARCH_MEMORY_H +#define __ASM_ARCH_MEMORY_H + +/* + * Physical DRAM offset. + */ +#define PHYS_OFFSET UL(0x00000000) +#define BUS_OFFSET UL(0x00000000) + +#endif diff --git a/arch/arm/mach-ux500/include/mach/setup.h b/arch/arm/mach-ux500/include/mach/setup.h new file mode 100644 index 00000000000..cf0ce1687f2 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/setup.h @@ -0,0 +1,23 @@ +/* + * Copyright (C) 2009 ST-Ericsson. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * These symbols are needed for board-specific files to call their + * own cpu-specific files + */ +#ifndef __ASM_ARCH_SETUP_H +#define __ASM_ARCH_SETUP_H + +#include <asm/mach/time.h> +#include <linux/init.h> + +extern void u8500_map_io(void); +extern void u8500_init_devices(void); +extern void u8500_init_irq(void); +/* We re-use nomadik_timer for this platform */ +extern void nmdk_timer_init(void); + +#endif /* __ASM_ARCH_SETUP_H */ diff --git a/arch/arm/mach-ux500/include/mach/smp.h b/arch/arm/mach-ux500/include/mach/smp.h new file mode 100644 index 00000000000..b59f7bc9725 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/smp.h @@ -0,0 +1,32 @@ +/* + * This file is based ARM realview platform. + * Copyright (C) ARM Limited. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ +#ifndef ASMARM_ARCH_SMP_H +#define ASMARM_ARCH_SMP_H + +#include <asm/hardware/gic.h> + +/* This is required to wakeup the secondary core */ +extern void u8500_secondary_startup(void); + +#define hard_smp_processor_id() \ + ({ \ + unsigned int cpunum; \ + __asm__("mrc p15, 0, %0, c0, c0, 5" \ + : "=r" (cpunum)); \ + cpunum &= 0x0F; \ + }) + +/* + * We use IRQ1 as the IPI + */ +static inline void smp_cross_call(const struct cpumask *mask) +{ + gic_raise_softirq(mask, 1); +} +#endif diff --git a/arch/arm/mach-ux500/include/mach/system.h b/arch/arm/mach-ux500/include/mach/system.h new file mode 100644 index 00000000000..c0cd8006f1a --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/system.h @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2009 ST-Ericsson. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ +#ifndef __ASM_ARCH_SYSTEM_H +#define __ASM_ARCH_SYSTEM_H + +static inline void arch_idle(void) +{ + /* + * This should do all the clock switching + * and wait for interrupt tricks + */ + cpu_do_idle(); +} + +static inline void arch_reset(char mode, const char *cmd) +{ + /* yet to be implemented - TODO */ +} + +#endif diff --git a/arch/arm/mach-ux500/include/mach/timex.h b/arch/arm/mach-ux500/include/mach/timex.h new file mode 100644 index 00000000000..d0942c17401 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/timex.h @@ -0,0 +1,6 @@ +#ifndef __ASM_ARCH_TIMEX_H +#define __ASM_ARCH_TIMEX_H + +#define CLOCK_TICK_RATE 110000000 + +#endif diff --git a/arch/arm/mach-ux500/include/mach/uncompress.h b/arch/arm/mach-ux500/include/mach/uncompress.h new file mode 100644 index 00000000000..8552eb188b5 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/uncompress.h @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2009 ST-Ericsson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef __ASM_ARCH_UNCOMPRESS_H +#define __ASM_ARCH_UNCOMPRESS_H + +#include <asm/setup.h> +#include <linux/io.h> +#include <mach/hardware.h> + +#define U8500_UART_DR 0x80007000 +#define U8500_UART_LCRH 0x8000702c +#define U8500_UART_CR 0x80007030 +#define U8500_UART_FR 0x80007018 + +static void putc(const char c) +{ + /* Do nothing if the UART is not enabled. */ + if (!(readb(U8500_UART_CR) & 0x1)) + return; + + if (c == '\n') + putc('\r'); + + while (readb(U8500_UART_FR) & (1 << 5)) + barrier(); + writeb(c, U8500_UART_DR); +} + +static void flush(void) +{ + if (!(readb(U8500_UART_CR) & 0x1)) + return; + while (readb(U8500_UART_FR) & (1 << 3)) + barrier(); +} + +static inline void arch_decomp_setup(void) +{ +} + +#define arch_decomp_wdog() /* nothing to do here */ + +#endif /* __ASM_ARCH_UNCOMPRESS_H */ diff --git a/arch/arm/mach-ux500/include/mach/vmalloc.h b/arch/arm/mach-ux500/include/mach/vmalloc.h new file mode 100644 index 00000000000..86cdbbce184 --- /dev/null +++ b/arch/arm/mach-ux500/include/mach/vmalloc.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2009 ST-Ericsson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#define VMALLOC_END 0xf0000000 diff --git a/arch/arm/mach-ux500/localtimer.c b/arch/arm/mach-ux500/localtimer.c new file mode 100644 index 00000000000..2288f6a7c51 --- /dev/null +++ b/arch/arm/mach-ux500/localtimer.c @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2008-2009 ST-Ericsson + * Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> + * + * This file is heavily based on relaview platform, almost a copy. + * + * Copyright (C) 2002 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/clockchips.h> + +#include <asm/irq.h> +#include <asm/smp_twd.h> +#include <asm/localtimer.h> + +/* + * Setup the local clock events for a CPU. + */ +void __cpuinit local_timer_setup(struct clock_event_device *evt) +{ + evt->irq = IRQ_LOCALTIMER; + twd_timer_setup(evt); +} diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c new file mode 100644 index 00000000000..8dfe7ca245d --- /dev/null +++ b/arch/arm/mach-ux500/platsmp.c @@ -0,0 +1,177 @@ +/* + * Copyright (C) 2002 ARM Ltd. + * Copyright (C) 2008 STMicroelctronics. + * Copyright (C) 2009 ST-Ericsson. + * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> + * + * This file is based on arm realview platform + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/smp.h> +#include <linux/io.h> + +#include <asm/cacheflush.h> +#include <asm/localtimer.h> +#include <asm/smp_scu.h> +#include <mach/hardware.h> + +/* + * control for which core is the next to come out of the secondary + * boot "holding pen" + */ +volatile int __cpuinitdata pen_release = -1; + +static unsigned int __init get_core_count(void) +{ + return scu_get_core_count(__io_address(U8500_SCU_BASE)); +} + +static DEFINE_SPINLOCK(boot_lock); + +void __cpuinit platform_secondary_init(unsigned int cpu) +{ + trace_hardirqs_off(); + + /* + * if any interrupts are already enabled for the primary + * core (e.g. timer irq), then they will not have been enabled + * for us: do so + */ + gic_cpu_init(0, __io_address(U8500_GIC_CPU_BASE)); + + /* + * let the primary processor know we're out of the + * pen, then head off into the C entry point + */ + pen_release = -1; + + /* + * Synchronise with the boot thread. + */ + spin_lock(&boot_lock); + spin_unlock(&boot_lock); +} + +int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + unsigned long timeout; + + /* + * set synchronisation state between this boot processor + * and the secondary one + */ + spin_lock(&boot_lock); + + /* + * The secondary processor is waiting to be released from + * the holding pen - release it, then wait for it to flag + * that it has been released by resetting pen_release. + */ + pen_release = cpu; + flush_cache_all(); + + timeout = jiffies + (1 * HZ); + while (time_before(jiffies, timeout)) { + if (pen_release == -1) + break; + } + + /* + * now the secondary core is starting up let it run its + * calibrations, then wait for it to finish + */ + spin_unlock(&boot_lock); + + return pen_release != -1 ? -ENOSYS : 0; +} + +static void __init wakeup_secondary(void) +{ + /* nobody is to be released from the pen yet */ + pen_release = -1; + + /* + * write the address of secondary startup into the backup ram register + * at offset 0x1FF4, then write the magic number 0xA1FEED01 to the + * backup ram register at offset 0x1FF0, which is what boot rom code + * is waiting for. This would wake up the secondary core from WFE + */ +#define U8500_CPU1_JUMPADDR_OFFSET 0x1FF4 + __raw_writel(virt_to_phys(u8500_secondary_startup), + (void __iomem *)IO_ADDRESS(U8500_BACKUPRAM0_BASE) + + U8500_CPU1_JUMPADDR_OFFSET); + +#define U8500_CPU1_WAKEMAGIC_OFFSET 0x1FF0 + __raw_writel(0xA1FEED01, + (void __iomem *)IO_ADDRESS(U8500_BACKUPRAM0_BASE) + + U8500_CPU1_WAKEMAGIC_OFFSET); + + /* make sure write buffer is drained */ + mb(); +} + +/* + * Initialise the CPU possible map early - this describes the CPUs + * which may be present or become present in the system. + */ +void __init smp_init_cpus(void) +{ + unsigned int i, ncores = get_core_count(); + + for (i = 0; i < ncores; i++) + set_cpu_possible(i, true); +} + +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + unsigned int ncores = get_core_count(); + unsigned int cpu = smp_processor_id(); + int i; + + /* sanity check */ + if (ncores == 0) { + printk(KERN_ERR + "U8500: strange CM count of 0? Default to 1\n"); + ncores = 1; + } + + if (ncores > num_possible_cpus()) { + printk(KERN_WARNING + "U8500: no. of cores (%d) greater than configured " + "maximum of %d - clipping\n", + ncores, num_possible_cpus()); + ncores = num_possible_cpus(); + } + + smp_store_cpu_info(cpu); + + /* + * are we trying to boot more cores than exist? + */ + if (max_cpus > ncores) + max_cpus = ncores; + + /* + * Initialise the present map, which describes the set of CPUs + * actually populated at the present time. + */ + for (i = 0; i < max_cpus; i++) + set_cpu_present(i, true); + + if (max_cpus > 1) { + /* + * Enable the local timer or broadcast device for the + * boot CPU, but only if we have more than one CPU. + */ + percpu_timer_setup(); + scu_enable(__io_address(U8500_SCU_BASE)); + wakeup_secondary(); + } +} |