Merge tag 'arc-5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC updates from Vineet Gupta:

 - support for Edge Triggered IRQs in ARC IDU intc

 - other fixes here and there

* tag 'arc-5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  arc: prefer __section from compiler_attributes.h
  dt-bindings: IDU-intc: Add support for edge-triggered interrupts
  dt-bindings: IDU-intc: Clean up documentation
  ARCv2: IDU-intc: Add support for edge-triggered interrupts
  ARC: unwind: Mark expected switch fall-throughs
  ARC: [plat-hsdk]: allow to switch between AXI DMAC port configurations
  ARC: fix typo in setup_dma_ops log message
  ARCv2: entry: early return from exception need not clear U & DE bits

Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt

 * ARC-HS Interrupt Distribution Unit
 
-  This optional 2nd level interrupt controller can be used in SMP configurations for
-  dynamic IRQ routing, load balancing of common/external IRQs towards core intc.
+  This optional 2nd level interrupt controller can be used in SMP configurations
+  for dynamic IRQ routing, load balancing of common/external IRQs towards core
+  intc.
 
 Properties:
 
 - compatible: "snps,archs-idu-intc"
 - interrupt-controller: This is an interrupt controller.
-- #interrupt-cells: Must be <1>.
-
-  Value of the cell specifies the "common" IRQ from peripheral to IDU. Number N
-  of the particular interrupt line of IDU corresponds to the line N+24 of the
-  core interrupt controller.
-
-  intc accessed via the special ARC AUX register interface, hence "reg" property
-  is not specified.
+- #interrupt-cells: Must be <1> or <2>.
+
+  Value of the first cell specifies the "common" IRQ from peripheral to IDU.
+  Number N of the particular interrupt line of IDU corresponds to the line N+24
+  of the core interrupt controller.
+
+  The (optional) second cell specifies any of the following flags:
+    - bits[3:0] trigger type and level flags
+        1 = low-to-high edge triggered
+        2 = NOT SUPPORTED (high-to-low edge triggered)
+        4 = active high level-sensitive <<< DEFAULT
+        8 = NOT SUPPORTED (active low level-sensitive)
+  When no second cell is specified, the interrupt is assumed to be level
+  sensitive.
+
+  The interrupt controller is accessed via the special ARC AUX register
+  interface, hence "reg" property is not specified.
 
 Example:
 	core_intc: core-interrupt-controller {

arch/arc/boot/dts/Makefile

@@ -12,3 +12,6 @@ dtb-y := $(builtindtb-y).dtb
 # for CONFIG_OF_ALL_DTBS test
 dtstree	:= $(srctree)/$(src)
 dtb-	:= $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
+
+# board-specific dtc flags
+DTC_FLAGS_hsdk += --pad 20

arch/arc/include/asm/entry-arcv2.h

@@ -256,7 +256,7 @@
 
 .macro FAKE_RET_FROM_EXCPN
 	lr      r9, [status32]
-	bic     r9, r9, (STATUS_U_MASK|STATUS_DE_MASK|STATUS_AE_MASK)
+	bic     r9, r9, STATUS_AE_MASK
 	or      r9, r9, STATUS_IE_MASK
 	kflag   r9
 .endm

arch/arc/include/asm/linkage.h

@@ -62,15 +62,15 @@
 #else	/* !__ASSEMBLY__ */
 
 #ifdef CONFIG_ARC_HAS_ICCM
-#define __arcfp_code __attribute__((__section__(".text.arcfp")))
+#define __arcfp_code __section(.text.arcfp)
 #else
-#define __arcfp_code __attribute__((__section__(".text")))
+#define __arcfp_code __section(.text)
 #endif
 
 #ifdef CONFIG_ARC_HAS_DCCM
-#define __arcfp_data __attribute__((__section__(".data.arcfp")))
+#define __arcfp_data __section(.data.arcfp)
 #else
-#define __arcfp_data __attribute__((__section__(".data")))
+#define __arcfp_data __section(.data)
 #endif
 
 #endif /* __ASSEMBLY__ */

arch/arc/include/asm/mach_desc.h

@@ -53,8 +53,7 @@ extern const struct machine_desc __arch_info_begin[], __arch_info_end[];
  */
 #define MACHINE_START(_type, _name)			\
 static const struct machine_desc __mach_desc_##_type	\
-__used							\
-__attribute__((__section__(".arch.info.init"))) = {	\
+__used __section(.arch.info.init) = {			\
 	.name		= _name,
 
 #define MACHINE_END				\

arch/arc/kernel/mcip.c

@@ -202,8 +202,8 @@ static void idu_set_dest(unsigned int cmn_irq, unsigned int cpu_mask)
 	__mcip_cmd_data(CMD_IDU_SET_DEST, cmn_irq, cpu_mask);
 }
 
-static void idu_set_mode(unsigned int cmn_irq, unsigned int lvl,
-			   unsigned int distr)
+static void idu_set_mode(unsigned int cmn_irq, bool set_lvl, unsigned int lvl,
+			 bool set_distr, unsigned int distr)
 {
 	union {
 		unsigned int word;
@@ -212,7 +212,10 @@ static void idu_set_mode(unsigned int cmn_irq, unsigned int lvl,
 		};
 	} data;
 
+	data.word = __mcip_cmd_read(CMD_IDU_READ_MODE, cmn_irq);
+	if (set_distr)
 		data.distr = distr;
+	if (set_lvl)
 		data.lvl = lvl;
 	__mcip_cmd_data(CMD_IDU_SET_MODE, cmn_irq, data.word);
 }
@@ -240,6 +243,25 @@ static void idu_irq_unmask(struct irq_data *data)
 	raw_spin_unlock_irqrestore(&mcip_lock, flags);
 }
 
+static void idu_irq_ack(struct irq_data *data)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&mcip_lock, flags);
+	__mcip_cmd(CMD_IDU_ACK_CIRQ, data->hwirq);
+	raw_spin_unlock_irqrestore(&mcip_lock, flags);
+}
+
+static void idu_irq_mask_ack(struct irq_data *data)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&mcip_lock, flags);
+	__mcip_cmd_data(CMD_IDU_SET_MASK, data->hwirq, 1);
+	__mcip_cmd(CMD_IDU_ACK_CIRQ, data->hwirq);
+	raw_spin_unlock_irqrestore(&mcip_lock, flags);
+}
+
 static int
 idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask,
 		     bool force)
@@ -263,13 +285,36 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask,
 	else
 		distribution_mode = IDU_M_DISTRI_RR;
 
-	idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, distribution_mode);
+	idu_set_mode(data->hwirq, false, 0, true, distribution_mode);
 
 	raw_spin_unlock_irqrestore(&mcip_lock, flags);
 
 	return IRQ_SET_MASK_OK;
 }
 
+static int idu_irq_set_type(struct irq_data *data, u32 type)
+{
+	unsigned long flags;
+
+	/*
+	 * ARCv2 IDU HW does not support inverse polarity, so these are the
+	 * only interrupt types supported.
+	 */
+	if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
+		return -EINVAL;
+
+	raw_spin_lock_irqsave(&mcip_lock, flags);
+
+	idu_set_mode(data->hwirq, true,
+		     type & IRQ_TYPE_EDGE_RISING ? IDU_M_TRIG_EDGE :
+						   IDU_M_TRIG_LEVEL,
+		     false, 0);
+
+	raw_spin_unlock_irqrestore(&mcip_lock, flags);
+
+	return 0;
+}
+
 static void idu_irq_enable(struct irq_data *data)
 {
 	/*
@@ -289,7 +334,10 @@ static struct irq_chip idu_irq_chip = {
 	.name			= "MCIP IDU Intc",
 	.irq_mask		= idu_irq_mask,
 	.irq_unmask		= idu_irq_unmask,
+	.irq_ack		= idu_irq_ack,
+	.irq_mask_ack		= idu_irq_mask_ack,
 	.irq_enable		= idu_irq_enable,
+	.irq_set_type		= idu_irq_set_type,
 #ifdef CONFIG_SMP
 	.irq_set_affinity       = idu_irq_set_affinity,
 #endif
@@ -317,7 +365,7 @@ static int idu_irq_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t
 }
 
 static const struct irq_domain_ops idu_irq_ops = {
-	.xlate	= irq_domain_xlate_onecell,
+	.xlate	= irq_domain_xlate_onetwocell,
 	.map	= idu_irq_map,
 };
 

arch/arc/kernel/unwind.c

@@ -826,7 +826,7 @@ static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc,
 			case DW_CFA_def_cfa:
 				state->cfa.reg = get_uleb128(&ptr.p8, end);
 				unw_debug("cfa_def_cfa: r%lu ", state->cfa.reg);
-				/*nobreak*/
+				/* fall through */
 			case DW_CFA_def_cfa_offset:
 				state->cfa.offs = get_uleb128(&ptr.p8, end);
 				unw_debug("cfa_def_cfa_offset: 0x%lx ",
@@ -834,7 +834,7 @@ static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc,
 				break;
 			case DW_CFA_def_cfa_sf:
 				state->cfa.reg = get_uleb128(&ptr.p8, end);
-				/*nobreak */
+				/* fall through */
 			case DW_CFA_def_cfa_offset_sf:
 				state->cfa.offs = get_sleb128(&ptr.p8, end)
 				    * state->dataAlign;

arch/arc/mm/dma.c

@@ -101,7 +101,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
 	if (is_isa_arcv2() && ioc_enable && coherent)
 		dev->dma_coherent = true;
 
-	dev_info(dev, "use %sncoherent DMA ops\n",
+	dev_info(dev, "use %scoherent DMA ops\n",
 		 dev->dma_coherent ? "" : "non");
 }
 

arch/arc/plat-hsdk/platform.c

@@ -6,11 +6,15 @@
  */
 
 #include <linux/init.h>
+#include <linux/of_fdt.h>
+#include <linux/libfdt.h>
 #include <linux/smp.h>
 #include <asm/arcregs.h>
 #include <asm/io.h>
 #include <asm/mach_desc.h>
 
+int arc_hsdk_axi_dmac_coherent __section(.data) = 0;
+
 #define ARC_CCM_UNUSED_ADDR	0x60000000
 
 static void __init hsdk_init_per_cpu(unsigned int cpu)
@@ -97,6 +101,42 @@ static void __init hsdk_enable_gpio_intc_wire(void)
 	iowrite32(GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTEN);
 }
 
+static int __init hsdk_tweak_node_coherency(const char *path, bool coherent)
+{
+	void *fdt = initial_boot_params;
+	const void *prop;
+	int node, ret;
+	bool dt_coh_set;
+
+	node = fdt_path_offset(fdt, path);
+	if (node < 0)
+		goto tweak_fail;
+
+	prop = fdt_getprop(fdt, node, "dma-coherent", &ret);
+	if (!prop && ret != -FDT_ERR_NOTFOUND)
+		goto tweak_fail;
+
+	dt_coh_set = ret != -FDT_ERR_NOTFOUND;
+	ret = 0;
+
+	/* need to remove "dma-coherent" property */
+	if (dt_coh_set && !coherent)
+		ret = fdt_delprop(fdt, node, "dma-coherent");
+
+	/* need to set "dma-coherent" property */
+	if (!dt_coh_set && coherent)
+		ret = fdt_setprop(fdt, node, "dma-coherent", NULL, 0);
+
+	if (ret < 0)
+		goto tweak_fail;
+
+	return 0;
+
+tweak_fail:
+	pr_err("failed to tweak %s to %scoherent\n", path, coherent ? "" : "non");
+	return -EFAULT;
+}
+
 enum hsdk_axi_masters {
 	M_HS_CORE = 0,
 	M_HS_RTT,
@@ -162,6 +202,39 @@ enum hsdk_axi_masters {
 #define CREG_PAE		((void __iomem *)(CREG_BASE + 0x180))
 #define CREG_PAE_UPDT		((void __iomem *)(CREG_BASE + 0x194))
 
+static void __init hsdk_init_memory_bridge_axi_dmac(void)
+{
+	bool coherent = !!arc_hsdk_axi_dmac_coherent;
+	u32 axi_m_slv1, axi_m_oft1;
+
+	/*
+	 * Don't tweak memory bridge configuration if we failed to tweak DTB
+	 * as we will end up in a inconsistent state.
+	 */
+	if (hsdk_tweak_node_coherency("/soc/dmac@80000", coherent))
+		return;
+
+	if (coherent) {
+		axi_m_slv1 = 0x77999999;
+		axi_m_oft1 = 0x76DCBA98;
+	} else {
+		axi_m_slv1 = 0x77777777;
+		axi_m_oft1 = 0x76543210;
+	}
+
+	writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_0));
+	writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_0));
+	writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_0));
+	writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_0));
+	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_0));
+
+	writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_1));
+	writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_1));
+	writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_1));
+	writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_1));
+	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_1));
+}
+
 static void __init hsdk_init_memory_bridge(void)
 {
 	u32 reg;
@@ -227,24 +300,14 @@ static void __init hsdk_init_memory_bridge(void)
 	writel(0x76543210, CREG_AXI_M_OFT1(M_GPU));
 	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_GPU));
 
-	writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_0));
-	writel(0x77777777, CREG_AXI_M_SLV1(M_DMAC_0));
-	writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_0));
-	writel(0x76543210, CREG_AXI_M_OFT1(M_DMAC_0));
-	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_0));
-
-	writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_1));
-	writel(0x77777777, CREG_AXI_M_SLV1(M_DMAC_1));
-	writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_1));
-	writel(0x76543210, CREG_AXI_M_OFT1(M_DMAC_1));
-	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_1));
-
 	writel(0x00000000, CREG_AXI_M_SLV0(M_DVFS));
 	writel(0x60000000, CREG_AXI_M_SLV1(M_DVFS));
 	writel(0x00000000, CREG_AXI_M_OFT0(M_DVFS));
 	writel(0x00000000, CREG_AXI_M_OFT1(M_DVFS));
 	writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DVFS));
 
+	hsdk_init_memory_bridge_axi_dmac();
+
 	/*
 	 * PAE remapping for DMA clients does not work due to an RTL bug, so
 	 * CREG_PAE register must be programmed to all zeroes, otherwise it

include/soc/arc/mcip.h

@@ -46,7 +46,9 @@ struct mcip_cmd {
 #define CMD_IDU_ENABLE			0x71
 #define CMD_IDU_DISABLE			0x72
 #define CMD_IDU_SET_MODE		0x74
+#define CMD_IDU_READ_MODE		0x75
 #define CMD_IDU_SET_DEST		0x76
+#define CMD_IDU_ACK_CIRQ		0x79
 #define CMD_IDU_SET_MASK		0x7C
 
 #define IDU_M_TRIG_LEVEL		0x0
@@ -119,4 +121,13 @@ static inline void __mcip_cmd_data(unsigned int cmd, unsigned int param,
 	__mcip_cmd(cmd, param);
 }
 
+/*
+ * Read MCIP register
+ */
+static inline unsigned int __mcip_cmd_read(unsigned int cmd, unsigned int param)
+{
+	__mcip_cmd(cmd, param);
+	return read_aux_reg(ARC_REG_MCIP_READBACK);
+}
+
 #endif