summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-mstar
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-mstar')
-rw-r--r--arch/arm/mach-mstar/Kconfig30
-rw-r--r--arch/arm/mach-mstar/Makefile1
-rw-r--r--arch/arm/mach-mstar/mstarv7.c129
3 files changed, 160 insertions, 0 deletions
diff --git a/arch/arm/mach-mstar/Kconfig b/arch/arm/mach-mstar/Kconfig
new file mode 100644
index 000000000..5dbea7b48
--- /dev/null
+++ b/arch/arm/mach-mstar/Kconfig
@@ -0,0 +1,30 @@
+menuconfig ARCH_MSTARV7
+ bool "MStar/Sigmastar Armv7 SoC Support"
+ depends on ARCH_MULTI_V7
+ select ARM_ERRATA_814220
+ select ARM_GIC
+ select ARM_HEAVY_MB
+ select HAVE_ARM_ARCH_TIMER
+ select MST_IRQ
+ select MSTAR_MSC313_MPLL
+ help
+ Support for newer MStar/Sigmastar SoC families that are
+ based on Armv7 cores like the Cortex A7 and share the same
+ basic hardware like the infinity and mercury series.
+
+if ARCH_MSTARV7
+
+config MACH_INFINITY
+ bool "MStar/Sigmastar infinity SoC support"
+ default ARCH_MSTARV7
+ help
+ Support for MStar/Sigmastar infinity IP camera SoCs.
+
+config MACH_MERCURY
+ bool "MStar/Sigmastar mercury SoC support"
+ default ARCH_MSTARV7
+ help
+ Support for MStar/Sigmastar mercury dash camera SoCs.
+ Note that older Mercury2 SoCs are ARM9 based and not supported.
+
+endif
diff --git a/arch/arm/mach-mstar/Makefile b/arch/arm/mach-mstar/Makefile
new file mode 100644
index 000000000..93b0391ed
--- /dev/null
+++ b/arch/arm/mach-mstar/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_ARCH_MSTARV7) += mstarv7.o
diff --git a/arch/arm/mach-mstar/mstarv7.c b/arch/arm/mach-mstar/mstarv7.c
new file mode 100644
index 000000000..274c4f0df
--- /dev/null
+++ b/arch/arm/mach-mstar/mstarv7.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree support for MStar/Sigmastar Armv7 SoCs
+ *
+ * Copyright (c) 2020 thingy.jp
+ * Author: Daniel Palmer <daniel@thingy.jp>
+ */
+
+#include <linux/init.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+
+/*
+ * In the u-boot code the area these registers are in is
+ * called "L3 bridge" and there are register descriptions
+ * for something in the same area called "AXI".
+ *
+ * It's not exactly known what this is but the vendor code
+ * for both u-boot and linux share calls to "flush the miu pipe".
+ * This seems to be to force pending CPU writes to memory so that
+ * the state is right before DMA capable devices try to read
+ * descriptors and data the CPU has prepared. Without doing this
+ * ethernet doesn't work reliably for example.
+ */
+
+#define MSTARV7_L3BRIDGE_FLUSH 0x14
+#define MSTARV7_L3BRIDGE_STATUS 0x40
+#define MSTARV7_L3BRIDGE_FLUSH_TRIGGER BIT(0)
+#define MSTARV7_L3BRIDGE_STATUS_DONE BIT(12)
+
+#ifdef CONFIG_SMP
+#define MSTARV7_CPU1_BOOT_ADDR_HIGH 0x4c
+#define MSTARV7_CPU1_BOOT_ADDR_LOW 0x50
+#define MSTARV7_CPU1_UNLOCK 0x58
+#define MSTARV7_CPU1_UNLOCK_MAGIC 0xbabe
+#endif
+
+static void __iomem *l3bridge;
+
+static const char * const mstarv7_board_dt_compat[] __initconst = {
+ "mstar,infinity",
+ "mstar,infinity2m",
+ "mstar,infinity3",
+ "mstar,mercury5",
+ NULL,
+};
+
+/*
+ * This may need locking to deal with situations where an interrupt
+ * happens while we are in here and mb() gets called by the interrupt handler.
+ *
+ * The vendor code did have a spin lock but it doesn't seem to be needed and
+ * removing it hasn't caused any side effects so far.
+ *
+ * [writel|readl]_relaxed have to be used here because otherwise
+ * we'd end up right back in here.
+ */
+static void mstarv7_mb(void)
+{
+ /* toggle the flush miu pipe fire bit */
+ writel_relaxed(0, l3bridge + MSTARV7_L3BRIDGE_FLUSH);
+ writel_relaxed(MSTARV7_L3BRIDGE_FLUSH_TRIGGER, l3bridge
+ + MSTARV7_L3BRIDGE_FLUSH);
+ while (!(readl_relaxed(l3bridge + MSTARV7_L3BRIDGE_STATUS)
+ & MSTARV7_L3BRIDGE_STATUS_DONE)) {
+ /* wait for flush to complete */
+ }
+}
+
+#ifdef CONFIG_SMP
+static int mstarv7_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ struct device_node *np;
+ u32 bootaddr = (u32) __pa_symbol(secondary_startup_arm);
+ void __iomem *smpctrl;
+
+ /*
+ * right now we don't know how to boot anything except
+ * cpu 1.
+ */
+ if (cpu != 1)
+ return -EINVAL;
+
+ np = of_find_compatible_node(NULL, NULL, "mstar,smpctrl");
+ smpctrl = of_iomap(np, 0);
+
+ if (!smpctrl)
+ return -ENODEV;
+
+ /* set the boot address for the second cpu */
+ writew(bootaddr & 0xffff, smpctrl + MSTARV7_CPU1_BOOT_ADDR_LOW);
+ writew((bootaddr >> 16) & 0xffff, smpctrl + MSTARV7_CPU1_BOOT_ADDR_HIGH);
+
+ /* unlock the second cpu */
+ writew(MSTARV7_CPU1_UNLOCK_MAGIC, smpctrl + MSTARV7_CPU1_UNLOCK);
+
+ /* and away we go...*/
+ arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+ iounmap(smpctrl);
+
+ return 0;
+}
+
+static const struct smp_operations __initdata mstarv7_smp_ops = {
+ .smp_boot_secondary = mstarv7_boot_secondary,
+};
+#endif
+
+static void __init mstarv7_init(void)
+{
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "mstar,l3bridge");
+ l3bridge = of_iomap(np, 0);
+ if (l3bridge)
+ soc_mb = mstarv7_mb;
+ else
+ pr_warn("Failed to install memory barrier, DMA will be broken!\n");
+}
+
+DT_MACHINE_START(MSTARV7_DT, "MStar/Sigmastar Armv7 (Device Tree)")
+ .dt_compat = mstarv7_board_dt_compat,
+ .init_machine = mstarv7_init,
+ .smp = smp_ops(mstarv7_smp_ops),
+MACHINE_END