diff options
Diffstat (limited to 'arch/arm/mach-ux500')
| -rw-r--r-- | arch/arm/mach-ux500/cache-l2x0.c | 95 | ||||
| -rw-r--r-- | arch/arm/mach-ux500/timer.c | 68 |
2 files changed, 163 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/cache-l2x0.c b/arch/arm/mach-ux500/cache-l2x0.c new file mode 100644 index 0000000..122ddde --- /dev/null +++ b/arch/arm/mach-ux500/cache-l2x0.c @@ -0,0 +1,95 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/io.h> +#include <asm/cacheflush.h> +#include <asm/hardware/cache-l2x0.h> +#include <mach/hardware.h> +#include <mach/id.h> + +static void __iomem *l2x0_base; + +static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask) +{ + /* wait for the operation to complete */ + while (readl_relaxed(reg) & mask) + cpu_relax(); +} + +static inline void ux500_cache_sync(void) +{ + writel_relaxed(0, l2x0_base + L2X0_CACHE_SYNC); + ux500_cache_wait(l2x0_base + L2X0_CACHE_SYNC, 1); +} + +/* + * The L2 cache cannot be turned off in the non-secure world. + * Dummy until a secure service is in place. + */ +static void ux500_l2x0_disable(void) +{ +} + +/* + * This is only called when doing a kexec, just after turning off the L2 + * and L1 cache, and it is surrounded by a spinlock in the generic version. + * However, we're not really turning off the L2 cache right now and the + * PL310 does not support exclusive accesses (used to implement the spinlock). + * So, the invalidation needs to be done without the spinlock. + */ +static void ux500_l2x0_inv_all(void) +{ + uint32_t l2x0_way_mask = (1<<16) - 1; /* Bitmask of active ways */ + + /* invalidate all ways */ + writel_relaxed(l2x0_way_mask, l2x0_base + L2X0_INV_WAY); + ux500_cache_wait(l2x0_base + L2X0_INV_WAY, l2x0_way_mask); + ux500_cache_sync(); +} + +static int __init ux500_l2x0_unlock(void) +{ + int i; + + /* + * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions + * apparently locks both caches before jumping to the kernel. The + * l2x0 core will not touch the unlock registers if the l2x0 is + * already enabled, so we do it right here instead. The PL310 has + * 8 sets of registers, one per possible CPU. + */ + for (i = 0; i < 8; i++) { + writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE + + i * L2X0_LOCKDOWN_STRIDE); + writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE + + i * L2X0_LOCKDOWN_STRIDE); + } + return 0; +} + +static int __init ux500_l2x0_init(void) +{ + if (cpu_is_u5500()) + l2x0_base = __io_address(U5500_L2CC_BASE); + else if (cpu_is_u8500()) + l2x0_base = __io_address(U8500_L2CC_BASE); + else + ux500_unknown_soc(); + + /* Unlock before init */ + ux500_l2x0_unlock(); + + /* 64KB way size, 8 way associativity, force WA */ + l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff); + + /* Override invalidate function */ + outer_cache.disable = ux500_l2x0_disable; + outer_cache.inv_all = ux500_l2x0_inv_all; + + return 0; +} + +early_initcall(ux500_l2x0_init); diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c new file mode 100644 index 0000000..aea467d --- /dev/null +++ b/arch/arm/mach-ux500/timer.c @@ -0,0 +1,68 @@ +/* + * Copyright (C) ST-Ericsson SA 2011 + * + * License Terms: GNU General Public License v2 + * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson + */ +#include <linux/io.h> +#include <linux/errno.h> +#include <linux/clksrc-dbx500-prcmu.h> + +#include <asm/localtimer.h> + +#include <plat/mtu.h> + +#include <mach/setup.h> +#include <mach/hardware.h> + +static void __init ux500_timer_init(void) +{ + void __iomem *prcmu_timer_base; + + if (cpu_is_u5500()) { +#ifdef CONFIG_LOCAL_TIMERS + twd_base = __io_address(U5500_TWD_BASE); +#endif + mtu_base = __io_address(U5500_MTU0_BASE); + prcmu_timer_base = __io_address(U5500_PRCMU_TIMER_3_BASE); + } else if (cpu_is_u8500()) { +#ifdef CONFIG_LOCAL_TIMERS + twd_base = __io_address(U8500_TWD_BASE); +#endif + mtu_base = __io_address(U8500_MTU0_BASE); + prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE); + } else { + ux500_unknown_soc(); + } + + /* + * Here we register the timerblocks active in the system. + * Localtimers (twd) is started when both cpu is up and running. + * MTU register a clocksource, clockevent and sched_clock. + * Since the MTU is located in the VAPE power domain + * it will be cleared in sleep which makes it unsuitable. + * We however need it as a timer tick (clockevent) + * during boot to calibrate delay until twd is started. + * RTC-RTT have problems as timer tick during boot since it is + * depending on delay which is not yet calibrated. RTC-RTT is in the + * always-on powerdomain and is used as clockevent instead of twd when + * sleeping. + * The PRCMU timer 4(3 for DB5500) register a clocksource and + * sched_clock with higher rating then MTU since is always-on. + * + */ + + nmdk_timer_init(); + clksrc_dbx500_prcmu_init(prcmu_timer_base); +} + +static void ux500_timer_reset(void) +{ + nmdk_clkevt_reset(); + nmdk_clksrc_reset(); +} + +struct sys_timer ux500_timer = { + .init = ux500_timer_init, + .resume = ux500_timer_reset, +}; |