Add support for cpu enable-method "mediatek,mt6580-smp" for booting secondary CPUs on MT6580. Signed-off-by: Scott Shu <scott.shu@xxxxxxxxxxxx> --- arch/arm/mach-mediatek/platsmp.c | 137 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) diff --git a/arch/arm/mach-mediatek/platsmp.c b/arch/arm/mach-mediatek/platsmp.c index a5bc108..94f7865 100644 --- a/arch/arm/mach-mediatek/platsmp.c +++ b/arch/arm/mach-mediatek/platsmp.c @@ -21,10 +21,16 @@ #include <linux/of_address.h> #include <linux/string.h> #include <linux/threads.h> +#include <linux/delay.h> +#include <asm/cacheflush.h> + +#include <linux/soc/mediatek/scpsys.h> #define MTK_MAX_CPU 8 #define MTK_SMP_REG_SIZE 0x1000 +static DEFINE_SPINLOCK(boot_lock); + struct mtk_smp_boot_info { unsigned long smp_base; unsigned int jump_reg; @@ -56,6 +62,126 @@ static const struct of_device_id mtk_smp_boot_infos[] __initconst = { static void __iomem *mtk_smp_base; static const struct mtk_smp_boot_info *mtk_smp_info; +#ifdef CONFIG_HOTPLUG_CPU +static int mt6580_cpu_kill(unsigned cpu) +{ + int ret; + + ret = spm_cpu_mtcmos_off(cpu, 1); + if (ret < 0) + return 0; + + return 1; +} + +static void mt6580_cpu_die(unsigned int cpu) +{ + for (;;) + cpu_do_idle(); +} +#endif + +static void write_pen_release(int val) +{ + pen_release = val; + /* Make sure this is visible to other CPUs */ + smp_wmb(); + sync_cache_w(&pen_release); +} + +/* + * Refer common "pen" secondary release method + */ +static int mt6580_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + unsigned long timeout; + int ret; + + /* + * 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. + * + * Note that "pen_release" is the hardware CPU ID, whereas + * "cpu" is Linux's internal ID. + */ + write_pen_release(cpu); + + /* + * CPU power on control by SPM + */ + ret = spm_cpu_mtcmos_on(cpu); + if (ret < 0) { + spin_unlock(&boot_lock); + return -ENXIO; + } + + timeout = jiffies + (1 * HZ); + while (time_before(jiffies, timeout)) { + /* Read barrier */ + smp_rmb(); + + if (pen_release == -1) + break; + + udelay(10); + } + + /* + * 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 ? -ENXIO : 0); +} + +static void mt6580_secondary_init(unsigned int cpu) +{ + /* + * Let the primary processor know we're out of the + * pen, then head off into the C entry point + */ + write_pen_release(-1); + + /* + * Synchronise with the boot thread. + */ + spin_lock(&boot_lock); + spin_unlock(&boot_lock); +} + +#define MT6580_INFRACFG_AO 0x10001000 +#define SW_ROM_PD BIT(31) + +static void __init mt6580_smp_prepare_cpus(unsigned int max_cpus) +{ + static void __iomem *infracfg_ao_base; + + infracfg_ao_base = ioremap(MT6580_INFRACFG_AO, 0x1000); + if (!infracfg_ao_base) { + pr_err("%s: Unable to map I/O memory\n", __func__); + return; + } + + /* Enable bootrom power down mode */ + writel_relaxed(readl(infracfg_ao_base + 0x804) | SW_ROM_PD, + infracfg_ao_base + 0x804); + + /* Write the address of slave startup into boot address + register for bootrom power down mode */ + writel_relaxed(virt_to_phys(secondary_startup_arm), + infracfg_ao_base + 0x800); + + iounmap(infracfg_ao_base); +} + static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle) { if (!mtk_smp_base) @@ -142,3 +268,14 @@ static struct smp_operations mt6589_smp_ops __initdata = { .smp_boot_secondary = mtk_boot_secondary, }; CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops); + +static struct smp_operations mt6580_smp_ops __initdata = { + .smp_prepare_cpus = mt6580_smp_prepare_cpus, + .smp_secondary_init = mt6580_secondary_init, + .smp_boot_secondary = mt6580_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_kill = mt6580_cpu_kill, + .cpu_die = mt6580_cpu_die, +#endif +}; +CPU_METHOD_OF_DECLARE(mt6580_smp, "mediatek,mt6580-smp", &mt6580_smp_ops); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html