Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

Pull microblaze arch updates from Michal Simek.

* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
  Revert "microblaze_mmu_v2: Update signal returning address"
  microblaze: Added more support for PCI
  microblaze: Prefer to use pr_XXX instead of printk(KERN_XX)
  microblaze: Fix bug with passing command line
  microblaze: Remove PAGE properties duplication
  microblaze: Remove additional andi which has been already done
  microblaze: Use predefined macro for ESR_DIZ
  microblaze: Support 4k/16k/64k pages
  microblaze: Do not used hardcoded value in exception handler
  microblaze: Added fdt chosen capability for timer
  microblaze: Add support for ioreadXX/iowriteXX_rep
  microblaze: Improve failure handling for GPIO reset
  microblaze: clinkage.h

arch/microblaze/Kconfig

@@ -243,14 +243,11 @@ choice
 config MICROBLAZE_4K_PAGES
 	bool "4k page size"
 
-config MICROBLAZE_8K_PAGES
-	bool "8k page size"
-
 config MICROBLAZE_16K_PAGES
 	bool "16k page size"
 
-config MICROBLAZE_32K_PAGES
-	bool "32k page size"
+config MICROBLAZE_64K_PAGES
+	bool "64k page size"
 
 endchoice
 

arch/microblaze/include/asm/clinkage.h

-#include <linux/linkage.h>

arch/microblaze/include/asm/io.h

@@ -35,6 +35,10 @@ extern resource_size_t isa_mem_base;
 
 #define IO_SPACE_LIMIT (0xFFFFFFFF)
 
+/* the following is needed to support PCI with some drivers */
+
+#define mmiowb()
+
 static inline unsigned char __raw_readb(const volatile void __iomem *addr)
 {
 	return *(volatile unsigned char __force *)addr;
@@ -248,4 +252,94 @@ static inline void __iomem *__ioremap(phys_addr_t address, unsigned long size,
 #define ioport_map(port, nr)	((void __iomem *)(port))
 #define ioport_unmap(addr)
 
+/* from asm-generic/io.h */
+#ifndef insb
+static inline void insb(unsigned long addr, void *buffer, int count)
+{
+	if (count) {
+		u8 *buf = buffer;
+		do {
+			u8 x = inb(addr);
+			*buf++ = x;
+		} while (--count);
+	}
+}
+#endif
+
+#ifndef insw
+static inline void insw(unsigned long addr, void *buffer, int count)
+{
+	if (count) {
+		u16 *buf = buffer;
+		do {
+			u16 x = inw(addr);
+			*buf++ = x;
+		} while (--count);
+	}
+}
+#endif
+
+#ifndef insl
+static inline void insl(unsigned long addr, void *buffer, int count)
+{
+	if (count) {
+		u32 *buf = buffer;
+		do {
+			u32 x = inl(addr);
+			*buf++ = x;
+		} while (--count);
+	}
+}
+#endif
+
+#ifndef outsb
+static inline void outsb(unsigned long addr, const void *buffer, int count)
+{
+	if (count) {
+		const u8 *buf = buffer;
+		do {
+			outb(*buf++, addr);
+		} while (--count);
+	}
+}
+#endif
+
+#ifndef outsw
+static inline void outsw(unsigned long addr, const void *buffer, int count)
+{
+	if (count) {
+		const u16 *buf = buffer;
+		do {
+			outw(*buf++, addr);
+		} while (--count);
+	}
+}
+#endif
+
+#ifndef outsl
+static inline void outsl(unsigned long addr, const void *buffer, int count)
+{
+	if (count) {
+		const u32 *buf = buffer;
+		do {
+			outl(*buf++, addr);
+		} while (--count);
+	}
+}
+#endif
+
+#define ioread8_rep(p, dst, count) \
+	insb((unsigned long) (p), (dst), (count))
+#define ioread16_rep(p, dst, count) \
+	insw((unsigned long) (p), (dst), (count))
+#define ioread32_rep(p, dst, count) \
+	insl((unsigned long) (p), (dst), (count))
+
+#define iowrite8_rep(p, src, count) \
+	outsb((unsigned long) (p), (src), (count))
+#define iowrite16_rep(p, src, count) \
+	outsw((unsigned long) (p), (src), (count))
+#define iowrite32_rep(p, src, count) \
+	outsl((unsigned long) (p), (src), (count))
+
 #endif /* _ASM_MICROBLAZE_IO_H */

arch/microblaze/include/asm/page.h

@@ -23,12 +23,10 @@
 #ifdef __KERNEL__
 
 /* PAGE_SHIFT determines the page size */
-#if defined(CONFIG_MICROBLAZE_32K_PAGES)
-#define PAGE_SHIFT		15
+#if defined(CONFIG_MICROBLAZE_64K_PAGES)
+#define PAGE_SHIFT		16
 #elif defined(CONFIG_MICROBLAZE_16K_PAGES)
 #define PAGE_SHIFT		14
-#elif defined(CONFIG_MICROBLAZE_8K_PAGES)
-#define PAGE_SHIFT		13
 #else
 #define PAGE_SHIFT		12
 #endif
@@ -37,6 +35,8 @@
 
 #define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
 
+#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
+
 #ifndef __ASSEMBLY__
 
 /* MS be sure that SLAB allocates aligned objects */
@@ -71,7 +71,6 @@ extern unsigned int __page_offset;
  * The basic type of a PTE - 32 bit physical addressing.
  */
 typedef unsigned long pte_basic_t;
-#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
 #define PTE_FMT		"%.8lx"
 
 #endif /* CONFIG_MMU */

arch/microblaze/include/asm/pci.h

@@ -22,6 +22,8 @@
 #include <asm/prom.h>
 #include <asm/pci-bridge.h>
 
+#include <asm-generic/pci-dma-compat.h>
+
 #define PCIBIOS_MIN_IO		0x1000
 #define PCIBIOS_MIN_MEM		0x10000000
 

arch/microblaze/include/asm/pgtable.h

@@ -234,12 +234,6 @@ static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 #ifndef _PAGE_SHARED
 #define _PAGE_SHARED	0
 #endif
-#ifndef _PAGE_HWWRITE
-#define _PAGE_HWWRITE	0
-#endif
-#ifndef _PAGE_HWEXEC
-#define _PAGE_HWEXEC	0
-#endif
 #ifndef _PAGE_EXEC
 #define _PAGE_EXEC	0
 #endif

arch/microblaze/kernel/head.S

@@ -109,20 +109,24 @@ no_fdt_arg:
 #ifndef CONFIG_CMDLINE_BOOL
 /*
  * handling command line
- * copy command line to __init_end. There is space for storing command line.
+ * copy command line directly to cmd_line placed in data section.
  */
+	beqid	r5, skip	/* Skip if NULL pointer */
 	or	r6, r0, r0		/* incremment */
-	ori	r4, r0, __init_end	/* load address of command line */
+	ori	r4, r0, cmd_line	/* load address of command line */
 	tophys(r4,r4)			/* convert to phys address */
 	ori	r3, r0, COMMAND_LINE_SIZE - 1 /* number of loops */
 _copy_command_line:
-	lbu	r2, r5, r6 /* r2=r5+r6 - r5 contain pointer to command line */
-	sb	r2, r4, r6		/* addr[r4+r6]= r2*/
+	/* r2=r5+r6 - r5 contain pointer to command line */
+	lbu		r2, r5, r6
+	beqid	r2, skip		/* Skip if no data */
+	sb		r2, r4, r6		/* addr[r4+r6]= r2*/
 	addik	r6, r6, 1		/* increment counting */
 	bgtid	r3, _copy_command_line	/* loop for all entries       */
-	addik	r3, r3, -1		/* descrement loop */
+	addik	r3, r3, -1		/* decrement loop */
 	addik	r5, r4, 0		/* add new space for command line */
 	tovirt(r5,r5)
+skip:
 #endif /* CONFIG_CMDLINE_BOOL */
 
 #ifdef NOT_COMPILE

arch/microblaze/kernel/hw_exception_handler.S

@@ -75,6 +75,7 @@
 #include <asm/mmu.h>
 #include <asm/pgtable.h>
 #include <asm/signal.h>
+#include <asm/registers.h>
 #include <asm/asm-offsets.h>
 
 #undef DEBUG
@@ -581,7 +582,7 @@ ex_handler_done:
 		 * tried to access a kernel or read-protected page - always
 		 * a SEGV). All other faults here must be stores, so no
 		 * need to check ESR_S as well. */
-		andi	r4, r4, 0x800		/* ESR_Z - zone protection */
+		andi	r4, r4, ESR_DIZ		/* ESR_Z - zone protection */
 		bnei	r4, ex2
 
 		ori	r4, r0, swapper_pg_dir
@@ -595,25 +596,25 @@ ex_handler_done:
 		 * tried to access a kernel or read-protected page - always
 		 * a SEGV). All other faults here must be stores, so no
 		 * need to check ESR_S as well. */
-		andi	r4, r4, 0x800		/* ESR_Z */
+		andi	r4, r4, ESR_DIZ		/* ESR_Z */
 		bnei	r4, ex2
 		/* get current task address */
 		addi	r4 ,CURRENT_TASK, TOPHYS(0);
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex4:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex2			/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -632,7 +633,9 @@ ex_handler_done:
 		 * Many of these bits are software only. Bits we don't set
 		 * here we (properly should) assume have the appropriate value.
 		 */
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+/* Ignore memory coherent, just LSB on ZSEL is used + EX/WR */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 		ori	r4, r4, _PAGE_HWEXEC	/* make it executable */
 
 		/* find the TLB index that caused the fault. It has to be here*/
@@ -701,18 +704,18 @@ ex_handler_done:
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex6:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex7			/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -731,7 +734,8 @@ ex_handler_done:
 		 * here we (properly should) assume have the appropriate value.
 		 */
 		brid	finish_tlb_load
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 	ex7:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -771,18 +775,18 @@ ex_handler_done:
 		lwi	r4, r4, TASK_THREAD+PGDIR
 	ex9:
 		tophys(r4,r4)
-		BSRLI(r5,r3,20)		/* Create L1 (pgdir/pmd) address */
-		andi	r5, r5, 0xffc
+		/* Create L1 (pgdir/pmd) address */
+		BSRLI(r5,r3, PGDIR_SHIFT - 2)
+		andi	r5, r5, PAGE_SIZE - 4
 /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */
 		or	r4, r4, r5
 		lwi	r4, r4, 0		/* Get L1 entry */
-		andi	r5, r4, 0xfffff000 /* Extract L2 (pte) base address */
+		andi	r5, r4, PAGE_MASK /* Extract L2 (pte) base address */
 		beqi	r5, ex10		/* Bail if no table */
 
 		tophys(r5,r5)
-		BSRLI(r6,r3,10)			/* Compute PTE address */
-		andi	r6, r6, 0xffc
-		andi	r5, r5, 0xfffff003
+		BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */
+		andi	r6, r6, PAGE_SIZE - 4
 		or	r5, r5, r6
 		lwi	r4, r5, 0		/* Get Linux PTE */
 
@@ -801,7 +805,8 @@ ex_handler_done:
 		 * here we (properly should) assume have the appropriate value.
 		 */
 		brid	finish_tlb_load
-		andni	r4, r4, 0x0ce2		/* Make sure 20, 21 are zero */
+		andi	r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \
+						TLB_ZSEL(1) | TLB_ATTR_MASK
 	ex10:
 		/* The bailout. Restore registers to pre-exception conditions
 		 * and call the heavyweights to help us out.
@@ -854,8 +859,14 @@ ex_handler_done:
 		 * set of bits. These are size, valid, E, U0, and ensure
 		 * bits 20 and 21 are zero.
 		 */
-		andi	r3, r3, 0xfffff000
-		ori	r3, r3, 0x0c0
+		andi	r3, r3, PAGE_MASK
+#ifdef CONFIG_MICROBLAZE_64K_PAGES
+		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_64K)
+#elif CONFIG_MICROBLAZE_16K_PAGES
+		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_16K)
+#else
+		ori	r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_4K)
+#endif
 		mts	rtlbhi,	r3		/* Load TLB HI */
 		nop
 

arch/microblaze/kernel/reset.c

@@ -26,13 +26,14 @@ void of_platform_reset_gpio_probe(void)
 				   "hard-reset-gpios", 0);
 
 	if (!gpio_is_valid(handle)) {
-		printk(KERN_INFO "Skipping unavailable RESET gpio %d (%s)\n",
+		pr_info("Skipping unavailable RESET gpio %d (%s)\n",
 				handle, "reset");
+		return;
 	}
 
 	ret = gpio_request(handle, "reset");
 	if (ret < 0) {
-		printk(KERN_INFO "GPIO pin is already allocated\n");
+		pr_info("GPIO pin is already allocated\n");
 		return;
 	}
 
@@ -49,7 +50,7 @@ void of_platform_reset_gpio_probe(void)
 	/* Setup output direction */
 	gpio_set_value(handle, 0);
 
-	printk(KERN_INFO "RESET: Registered gpio device: %d, current val: %d\n",
+	pr_info("RESET: Registered gpio device: %d, current val: %d\n",
 							handle, reset_val);
 	return;
 err:
@@ -60,7 +61,10 @@ void of_platform_reset_gpio_probe(void)
 
 static void gpio_system_reset(void)
 {
-	gpio_set_value(handle, 1 - reset_val);
+	if (gpio_is_valid(handle))
+		gpio_set_value(handle, 1 - reset_val);
+	else
+		pr_notice("Reset GPIO unavailable - halting!\n");
 }
 #else
 #define gpio_system_reset() do {} while (0)
@@ -72,30 +76,29 @@ void of_platform_reset_gpio_probe(void)
 
 void machine_restart(char *cmd)
 {
-	printk(KERN_NOTICE "Machine restart...\n");
+	pr_notice("Machine restart...\n");
 	gpio_system_reset();
-	dump_stack();
 	while (1)
 		;
 }
 
 void machine_shutdown(void)
 {
-	printk(KERN_NOTICE "Machine shutdown...\n");
+	pr_notice("Machine shutdown...\n");
 	while (1)
 		;
 }
 
 void machine_halt(void)
 {
-	printk(KERN_NOTICE "Machine halt...\n");
+	pr_notice("Machine halt...\n");
 	while (1)
 		;
 }
 
 void machine_power_off(void)
 {
-	printk(KERN_NOTICE "Machine power off...\n");
+	pr_notice("Machine power off...\n");
 	while (1)
 		;
 }

arch/microblaze/kernel/setup.c

@@ -40,7 +40,12 @@ DEFINE_PER_CPU(unsigned int, R11_SAVE);	/* Temp variable for entry */
 DEFINE_PER_CPU(unsigned int, CURRENT_SAVE);	/* Saved current pointer */
 
 unsigned int boot_cpuid;
-char cmd_line[COMMAND_LINE_SIZE];
+/*
+ * Placed cmd_line to .data section because can be initialized from
+ * ASM code. Default position is BSS section which is cleared
+ * in machine_early_init().
+ */
+char cmd_line[COMMAND_LINE_SIZE] __attribute__ ((section(".data")));
 
 void __init setup_arch(char **cmdline_p)
 {
@@ -64,7 +69,7 @@ void __init setup_arch(char **cmdline_p)
 	xilinx_pci_init();
 
 #if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)
-	printk(KERN_NOTICE "Self modified code enable\n");
+	pr_notice("Self modified code enable\n");
 #endif
 
 #ifdef CONFIG_VT
@@ -130,12 +135,6 @@ void __init machine_early_init(const char *cmdline, unsigned int ram,
 	memset(__bss_start, 0, __bss_stop-__bss_start);
 	memset(_ssbss, 0, _esbss-_ssbss);
 
-	/* Copy command line passed from bootloader */
-#ifndef CONFIG_CMDLINE_BOOL
-	if (cmdline && cmdline[0] != '\0')
-		strlcpy(cmd_line, cmdline, COMMAND_LINE_SIZE);
-#endif
-
 	lockdep_init();
 
 /* initialize device tree for usage in early_printk */

arch/microblaze/kernel/signal.c

@@ -290,15 +290,7 @@ handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
 	case -ERESTARTNOINTR:
 do_restart:
 		/* offset of 4 bytes to re-execute trap (brki) instruction */
-#ifndef CONFIG_MMU
 		regs->pc -= 4;
-#else
-		/* offset of 8 bytes required = 4 for rtbd
-		   offset, plus 4 for size of
-			"brki r14,8"
-		   instruction. */
-		regs->pc -= 8;
-#endif
 		break;
 	}
 }

arch/microblaze/kernel/timer.c

@@ -116,21 +116,21 @@ static void microblaze_timer_set_mode(enum clock_event_mode mode,
 {
 	switch (mode) {
 	case CLOCK_EVT_MODE_PERIODIC:
-		printk(KERN_INFO "%s: periodic\n", __func__);
+		pr_info("%s: periodic\n", __func__);
 		microblaze_timer0_start_periodic(freq_div_hz);
 		break;
 	case CLOCK_EVT_MODE_ONESHOT:
-		printk(KERN_INFO "%s: oneshot\n", __func__);
+		pr_info("%s: oneshot\n", __func__);
 		break;
 	case CLOCK_EVT_MODE_UNUSED:
-		printk(KERN_INFO "%s: unused\n", __func__);
+		pr_info("%s: unused\n", __func__);
 		break;
 	case CLOCK_EVT_MODE_SHUTDOWN:
-		printk(KERN_INFO "%s: shutdown\n", __func__);
+		pr_info("%s: shutdown\n", __func__);
 		microblaze_timer0_stop();
 		break;
 	case CLOCK_EVT_MODE_RESUME:
-		printk(KERN_INFO "%s: resume\n", __func__);
+		pr_info("%s: resume\n", __func__);
 		break;
 	}
 }
@@ -257,7 +257,15 @@ void __init time_init(void)
 				0
 			};
 #endif
-	timer = of_find_compatible_node(NULL, NULL, "xlnx,xps-timer-1.00.a");
+	prop = of_get_property(of_chosen, "system-timer", NULL);
+	if (prop)
+		timer = of_find_node_by_phandle(be32_to_cpup(prop));
+	else
+		pr_info("No chosen timer found, using default\n");
+
+	if (!timer)
+		timer = of_find_compatible_node(NULL, NULL,
+						"xlnx,xps-timer-1.00.a");
 	BUG_ON(!timer);
 
 	timer_baseaddr = be32_to_cpup(of_get_property(timer, "reg", NULL));
@@ -266,14 +274,14 @@ void __init time_init(void)
 	timer_num = be32_to_cpup(of_get_property(timer,
 						"xlnx,one-timer-only", NULL));
 	if (timer_num) {
-		printk(KERN_EMERG "Please enable two timers in HW\n");
+		pr_emerg("Please   enable two timers in HW\n");
 		BUG();
 	}
 
 #ifdef CONFIG_SELFMOD_TIMER
 	selfmod_function((int *) arr_func, timer_baseaddr);
 #endif
-	printk(KERN_INFO "%s #0 at 0x%08x, irq=%d\n",
+	pr_info("%s #0 at 0x%08x, irq=%d\n",
 		timer->name, timer_baseaddr, irq);
 
 	/* If there is clock-frequency property than use it */