diff options
Diffstat (limited to 'target/linux/layerscape/patches-4.4/3008-armv8-aarch32-Add-SMP-support-for-32-bit-Linux.patch')
| -rw-r--r-- | target/linux/layerscape/patches-4.4/3008-armv8-aarch32-Add-SMP-support-for-32-bit-Linux.patch | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-4.4/3008-armv8-aarch32-Add-SMP-support-for-32-bit-Linux.patch b/target/linux/layerscape/patches-4.4/3008-armv8-aarch32-Add-SMP-support-for-32-bit-Linux.patch new file mode 100644 index 0000000000..31f1d98aea --- /dev/null +++ b/target/linux/layerscape/patches-4.4/3008-armv8-aarch32-Add-SMP-support-for-32-bit-Linux.patch @@ -0,0 +1,103 @@ +From 5d06e90bd0e3bdd104b7b25173e05617f02dc44d Mon Sep 17 00:00:00 2001 +From: Alison Wang <b18965@freescale.com> +Date: Fri, 13 May 2016 15:09:47 +0800 +Subject: [PATCH 08/70] armv8: aarch32: Add SMP support for 32-bit Linux + +The patch adds SMP support for running 32-bit Linux kernel. Spin-table +method is used for SMP support. + +Signed-off-by: Alison Wang <alison.wang@nxp.com> +Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com> +--- + arch/arm/mach-imx/common.h | 1 + + arch/arm/mach-imx/mach-ls1043a.c | 1 + + arch/arm/mach-imx/platsmp.c | 49 ++++++++++++++++++++++++++++++++++++++ + 3 files changed, 51 insertions(+) + +--- a/arch/arm/mach-imx/common.h ++++ b/arch/arm/mach-imx/common.h +@@ -155,5 +155,6 @@ static inline void imx_init_l2cache(void + + extern struct smp_operations imx_smp_ops; + extern struct smp_operations ls1021a_smp_ops; ++extern const struct smp_operations layerscape_smp_ops; + + #endif +--- a/arch/arm/mach-imx/mach-ls1043a.c ++++ b/arch/arm/mach-imx/mach-ls1043a.c +@@ -17,5 +17,6 @@ static const char * const ls1043a_dt_com + }; + + DT_MACHINE_START(LS1043A, "Freescale LS1043A") ++ .smp = smp_ops(layerscape_smp_ops), + .dt_compat = ls1043a_dt_compat, + MACHINE_END +--- a/arch/arm/mach-imx/platsmp.c ++++ b/arch/arm/mach-imx/platsmp.c +@@ -14,6 +14,7 @@ + #include <linux/of_address.h> + #include <linux/of.h> + #include <linux/smp.h> ++#include <linux/types.h> + + #include <asm/cacheflush.h> + #include <asm/page.h> +@@ -26,6 +27,8 @@ + u32 g_diag_reg; + static void __iomem *scu_base; + ++static u64 cpu_release_addr[NR_CPUS]; ++ + static struct map_desc scu_io_desc __initdata = { + /* .virtual and .pfn are run-time assigned */ + .length = SZ_4K, +@@ -127,3 +130,49 @@ struct smp_operations ls1021a_smp_ops _ + .smp_prepare_cpus = ls1021a_smp_prepare_cpus, + .smp_boot_secondary = ls1021a_boot_secondary, + }; ++ ++static int layerscape_smp_boot_secondary(unsigned int cpu, ++ struct task_struct *idle) ++{ ++ u32 secondary_startup_phys; ++ __le32 __iomem *release_addr; ++ ++ secondary_startup_phys = virt_to_phys(secondary_startup); ++ ++ release_addr = ioremap_cache((u32)cpu_release_addr[cpu], ++ sizeof(u64)); ++ if (!release_addr) ++ return -ENOMEM; ++ ++ writel_relaxed(secondary_startup_phys, release_addr); ++ writel_relaxed(0, release_addr + 1); ++ __cpuc_flush_dcache_area((__force void *)release_addr, ++ sizeof(u64)); ++ ++ sev(); ++ ++ iounmap(release_addr); ++ ++ return 0; ++} ++ ++static void layerscape_smp_init_cpus(void) ++{ ++ struct device_node *dnt = NULL; ++ unsigned int cpu = 0; ++ ++ while ((dnt = of_find_node_by_type(dnt, "cpu"))) { ++ if (of_property_read_u64(dnt, "cpu-release-addr", ++ &cpu_release_addr[cpu])) { ++ pr_err("CPU %d: missing or invalid cpu-release-addr property\n", ++ cpu); ++ } ++ ++ cpu++; ++ } ++} ++ ++const struct smp_operations layerscape_smp_ops __initconst = { ++ .smp_init_cpus = layerscape_smp_init_cpus, ++ .smp_boot_secondary = layerscape_smp_boot_secondary, ++}; |