diff options
Diffstat (limited to 'arch/arm/mm/cache-l2x0.c')
| -rw-r--r-- | arch/arm/mm/cache-l2x0.c | 73 |
1 files changed, 70 insertions, 3 deletions
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c index e99a0ffd22d..efc5cabf70e 100644 --- a/arch/arm/mm/cache-l2x0.c +++ b/arch/arm/mm/cache-l2x0.c @@ -16,14 +16,17 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/cpu.h> #include <linux/err.h> #include <linux/init.h> +#include <linux/smp.h> #include <linux/spinlock.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_address.h> #include <asm/cacheflush.h> +#include <asm/cp15.h> #include <asm/cputype.h> #include <asm/hardware/cache-l2x0.h> #include "cache-tauros3.h" @@ -639,7 +642,24 @@ static void l2c310_resume(void) L310_POWER_CTRL); l2c_enable(base, l2x0_saved_regs.aux_ctrl, 8); + + /* Re-enable full-line-of-zeros for Cortex-A9 */ + if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) + set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); + } +} + +static int l2c310_cpu_enable_flz(struct notifier_block *nb, unsigned long act, void *data) +{ + switch (act & ~CPU_TASKS_FROZEN) { + case CPU_STARTING: + set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); + break; + case CPU_DYING: + set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1))); + break; } + return NOTIFY_OK; } static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) @@ -657,6 +677,36 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) } } + if (cortex_a9) { + u32 aux_cur = readl_relaxed(base + L2X0_AUX_CTRL); + u32 acr = get_auxcr(); + + pr_debug("Cortex-A9 ACR=0x%08x\n", acr); + + if (acr & BIT(3) && !(aux_cur & L310_AUX_CTRL_FULL_LINE_ZERO)) + pr_err("L2C-310: full line of zeros enabled in Cortex-A9 but not L2C-310 - invalid\n"); + + if (aux & L310_AUX_CTRL_FULL_LINE_ZERO && !(acr & BIT(3))) + pr_err("L2C-310: enabling full line of zeros but not enabled in Cortex-A9\n"); + + if (!(aux & L310_AUX_CTRL_FULL_LINE_ZERO) && !outer_cache.write_sec) { + aux |= L310_AUX_CTRL_FULL_LINE_ZERO; + pr_info("L2C-310 full line of zeros enabled for Cortex-A9\n"); + } + } else if (aux & (L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP)) { + pr_err("L2C-310: disabling Cortex-A9 specific feature bits\n"); + aux &= ~(L310_AUX_CTRL_FULL_LINE_ZERO | L310_AUX_CTRL_EARLY_BRESP); + } + + if (aux & (L310_AUX_CTRL_DATA_PREFETCH | L310_AUX_CTRL_INSTR_PREFETCH)) { + u32 prefetch = readl_relaxed(base + L310_PREFETCH_CTRL); + + pr_info("L2C-310 %s%s prefetch enabled, offset %u lines\n", + aux & L310_AUX_CTRL_INSTR_PREFETCH ? "I" : "", + aux & L310_AUX_CTRL_DATA_PREFETCH ? "D" : "", + 1 + (prefetch & L310_PREFETCH_CTRL_OFFSET_MASK)); + } + /* r3p0 or later has power control register */ if (rev >= L310_CACHE_ID_RTL_R3P0) { u32 power_ctrl; @@ -677,6 +727,11 @@ static void __init l2c310_enable(void __iomem *base, u32 aux, unsigned num_lock) aux |= L310_AUX_CTRL_NS_LOCKDOWN; l2c_enable(base, aux, num_lock); + + if (aux & L310_AUX_CTRL_FULL_LINE_ZERO) { + set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1)); + cpu_notifier(l2c310_cpu_enable_flz, 0); + } } static void __init l2c310_fixup(void __iomem *base, u32 cache_id, @@ -732,6 +787,18 @@ static void __init l2c310_fixup(void __iomem *base, u32 cache_id, } } +static void l2c310_disable(void) +{ + /* + * If full-line-of-zeros is enabled, we must first disable it in the + * Cortex-A9 auxiliary control register before disabling the L2 cache. + */ + if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_FULL_LINE_ZERO) + set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1))); + + l2c_disable(); +} + static const struct l2c_init_data l2c310_init_fns __initconst = { .type = "L2C-310", .way_size_0 = SZ_8K, @@ -744,7 +811,7 @@ static const struct l2c_init_data l2c310_init_fns __initconst = { .clean_range = l2c210_clean_range, .flush_range = l2c210_flush_range, .flush_all = l2c210_flush_all, - .disable = l2c_disable, + .disable = l2c310_disable, .sync = l2c210_sync, .resume = l2c310_resume, }, @@ -995,7 +1062,7 @@ static const struct l2c_init_data of_l2c310_data __initconst = { .clean_range = l2c210_clean_range, .flush_range = l2c210_flush_range, .flush_all = l2c210_flush_all, - .disable = l2c_disable, + .disable = l2c310_disable, .sync = l2c210_sync, .resume = l2c310_resume, }, @@ -1342,7 +1409,7 @@ static const struct l2c_init_data of_bcm_l2x0_data __initconst = { .clean_range = bcm_clean_range, .flush_range = bcm_flush_range, .flush_all = l2c210_flush_all, - .disable = l2c_disable, + .disable = l2c310_disable, .sync = l2c210_sync, .resume = l2c310_resume, }, |