sh: Integrate the SH-5 onchip_remap() more coherently.

Presently this is special-cased for early initialization. While there are
situations where these static early initializations are still necessary,
with minor changes it is possible to use this for the regular ioremap
implementation as well. This allows us to kill off the special-casing for
the remap completely and to start tidying up all of the SH-5
special-casing in drivers.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/mach-cayman/irq.c

@@ -161,7 +161,7 @@ void init_cayman_irq(void)
 {
 	int i;
 
-	epld_virt = onchip_remap(EPLD_BASE, 1024, "EPLD");
+	epld_virt = (unsigned long)ioremap_nocache(EPLD_BASE, 1024);
 	if (!epld_virt) {
 		printk(KERN_ERR "Cayman IRQ: Unable to remap EPLD\n");
 		return;

arch/sh/boards/mach-cayman/setup.c

@@ -102,7 +102,7 @@ static int __init smsc_superio_setup(void)
 {
 	unsigned char devid, devrev;
 
-	smsc_superio_virt = onchip_remap(SMSC_SUPERIO_BASE, 1024, "SMSC SuperIO");
+	smsc_superio_virt = (unsigned long)ioremap_nocache(SMSC_SUPERIO_BASE, 1024);
 	if (!smsc_superio_virt) {
 		panic("Unable to remap SMSC SuperIO\n");
 	}

arch/sh/drivers/pci/pci-sh5.c

@@ -119,12 +119,12 @@ static int __init sh5pci_init(void)
                 return -EINVAL;
         }
 
-	pcicr_virt = onchip_remap(SH5PCI_ICR_BASE, 1024, "PCICR");
+	pcicr_virt = (unsigned long)ioremap_nocache(SH5PCI_ICR_BASE, 1024);
 	if (!pcicr_virt) {
 		panic("Unable to remap PCICR\n");
 	}
 
-	PCI_IO_AREA = onchip_remap(SH5PCI_IO_BASE, 0x10000, "PCIIO");
+	PCI_IO_AREA = (unsigned long)ioremap_nocache(SH5PCI_IO_BASE, 0x10000);
 	if (!PCI_IO_AREA) {
 		panic("Unable to remap PCIIO\n");
 	}

arch/sh/include/asm/io.h

@@ -224,11 +224,6 @@ void __iomem *__ioremap(unsigned long offset, unsigned long size,
 			unsigned long flags);
 void __iounmap(void __iomem *addr);
 
-/* arch/sh/mm/ioremap_64.c */
-unsigned long onchip_remap(unsigned long addr, unsigned long size,
-			   const char *name);
-extern void onchip_unmap(unsigned long vaddr);
-
 static inline void __iomem *
 __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
 {
@@ -263,8 +258,6 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
 	return __ioremap(offset, size, flags);
 }
 #else
-#define onchip_remap(addr, size, name)		(addr)
-#define onchip_unmap(addr)			do { } while (0)
 #define __ioremap_mode(offset, size, flags)	((void __iomem *)(offset))
 #define __iounmap(addr)				do { } while (0)
 #endif /* CONFIG_MMU */

arch/sh/kernel/cpu/irq/intc-sh5.c

@@ -188,7 +188,7 @@ void __init plat_irq_setup(void)
 	unsigned long reg;
 	int i;
 
-	intc_virt = onchip_remap(INTC_BASE, 1024, "INTC");
+	intc_virt = (unsigned long)ioremap_nocache(INTC_BASE, 1024);
 	if (!intc_virt) {
 		panic("Unable to remap INTC\n");
 	}

arch/sh/kernel/cpu/sh5/Makefile

@@ -6,6 +6,9 @@ obj-y := entry.o probe.o switchto.o
 obj-$(CONFIG_SH_FPU)		+= fpu.o
 obj-$(CONFIG_KALLSYMS)		+= unwind.o
 
+# CPU subtype setup
+obj-$(CONFIG_CPU_SH5)		+= setup-sh5.o
+
 # Primary on-chip clocks (common)
 clock-$(CONFIG_CPU_SH5)		:= clock-sh5.o
 

arch/sh/kernel/cpu/sh5/clock-sh5.c

@@ -71,7 +71,7 @@ static struct clk_ops *sh5_clk_ops[] = {
 
 void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
 {
-	cprc_base = onchip_remap(CPRC_BASE, 1024, "CPRC");
+	cprc_base = (unsigned long)ioremap_nocache(CPRC_BASE, 1024);
 	BUG_ON(!cprc_base);
 
 	if (idx < ARRAY_SIZE(sh5_clk_ops))

arch/sh/kernel/cpu/sh5/entry.S

@@ -1410,8 +1410,8 @@ peek_real_address_q:
 	   r2(out) : result quadword
 
 	   This is provided as a cheapskate way of manipulating device
-	   registers for debugging (to avoid the need to onchip_remap the debug
-	   module, and to avoid the need to onchip_remap the watchpoint
+	   registers for debugging (to avoid the need to ioremap the debug
+	   module, and to avoid the need to ioremap the watchpoint
 	   controller in a way that identity maps sufficient bits to avoid the
 	   SH5-101 cut2 silicon defect).
 
@@ -1459,8 +1459,8 @@ poke_real_address_q:
 	   r3 : quadword value to write.
 
 	   This is provided as a cheapskate way of manipulating device
-	   registers for debugging (to avoid the need to onchip_remap the debug
-	   module, and to avoid the need to onchip_remap the watchpoint
+	   registers for debugging (to avoid the need to ioremap the debug
+	   module, and to avoid the need to ioremap the watchpoint
 	   controller in a way that identity maps sufficient bits to avoid the
 	   SH5-101 cut2 silicon defect).
 

arch/sh/kernel/cpu/sh5/setup-sh5.c

@@ -0,0 +1,46 @@
+/*
+ * SH5-101/SH5-103 CPU Setup
+ *
+ *  Copyright (C) 2009  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/serial_sci.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <asm/addrspace.h>
+
+static struct plat_sci_port sci_platform_data[] = {
+	{
+		.mapbase	= PHYS_PERIPHERAL_BLOCK + 0x01030000,
+		.flags		= UPF_BOOT_AUTOCONF | UPF_IOREMAP,
+		.type		= PORT_SCIF,
+		.irqs		= { 39, 40, 42, 0 },
+	}, {
+		.flags = 0,
+	}
+};
+
+static struct platform_device sci_device = {
+	.name		= "sh-sci",
+	.id		= -1,
+	.dev		= {
+		.platform_data	= sci_platform_data,
+	},
+};
+
+static struct platform_device *sh5_devices[] __initdata = {
+	&sci_device,
+};
+
+static int __init sh5_devices_setup(void)
+{
+	return platform_add_devices(sh5_devices,
+				    ARRAY_SIZE(sh5_devices));
+}
+__initcall(sh5_devices_setup);

arch/sh/kernel/time_64.c

@@ -243,12 +243,12 @@ void __init time_init(void)
 	unsigned long interval;
 	struct clk *clk;
 
-	tmu_base = onchip_remap(TMU_BASE, 1024, "TMU");
+	tmu_base = (unsigned long)ioremap_nocache(TMU_BASE, 1024);
 	if (!tmu_base) {
 		panic("Unable to remap TMU\n");
 	}
 
-	rtc_base = onchip_remap(RTC_BASE, 1024, "RTC");
+	rtc_base = (unsigned long)ioremap_nocache(RTC_BASE, 1024);
 	if (!rtc_base) {
 		panic("Unable to remap RTC\n");
 	}

arch/sh/mm/ioremap_64.c

@@ -27,88 +27,17 @@
 #include <asm/tlbflush.h>
 #include <asm/mmu.h>
 
-static void shmedia_mapioaddr(unsigned long, unsigned long);
-static unsigned long shmedia_ioremap(struct resource *, u32, int);
-
-/*
- * Generic mapping function (not visible outside):
- */
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- */
-void *__ioremap(unsigned long phys_addr, unsigned long size,
-		unsigned long flags)
-{
-	void * addr;
-	struct vm_struct * area;
-	unsigned long offset, last_addr;
-	pgprot_t pgprot;
-
-	/* Don't allow wraparound or zero size */
-	last_addr = phys_addr + size - 1;
-	if (!size || last_addr < phys_addr)
-		return NULL;
-
-	pgprot = __pgprot(_PAGE_PRESENT  | _PAGE_READ   |
-			  _PAGE_WRITE    | _PAGE_DIRTY  |
-			  _PAGE_ACCESSED | _PAGE_SHARED | flags);
-
-	/*
-	 * Mappings have to be page-aligned
-	 */
-	offset = phys_addr & ~PAGE_MASK;
-	phys_addr &= PAGE_MASK;
-	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
-
-	/*
-	 * Ok, go for it..
-	 */
-	area = get_vm_area(size, VM_IOREMAP);
-	if (!area)
-		return NULL;
-	pr_debug("Get vm_area returns %p addr %p\n", area, area->addr);
-	area->phys_addr = phys_addr;
-	addr = area->addr;
-	if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
-			       phys_addr, pgprot)) {
-		vunmap(addr);
-		return NULL;
-	}
-	return (void *) (offset + (char *)addr);
-}
-EXPORT_SYMBOL(__ioremap);
-
-void __iounmap(void *addr)
-{
-	struct vm_struct *area;
-
-	vfree((void *) (PAGE_MASK & (unsigned long) addr));
-	area = remove_vm_area((void *) (PAGE_MASK & (unsigned long) addr));
-	if (!area) {
-		printk(KERN_ERR "iounmap: bad address %p\n", addr);
-		return;
-	}
-
-	kfree(area);
-}
-EXPORT_SYMBOL(__iounmap);
-
 static struct resource shmedia_iomap = {
 	.name	= "shmedia_iomap",
 	.start	= IOBASE_VADDR + PAGE_SIZE,
 	.end	= IOBASE_END - 1,
 };
 
-static void shmedia_mapioaddr(unsigned long pa, unsigned long va);
+static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
+			      unsigned long flags);
 static void shmedia_unmapioaddr(unsigned long vaddr);
-static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz);
+static void __iomem *shmedia_ioremap(struct resource *res, u32 pa,
+				     int sz, unsigned long flags);
 
 /*
  * We have the same problem as the SPARC, so lets have the same comment:
@@ -130,18 +59,18 @@ static struct xresource xresv[XNRES];
 
 static struct xresource *xres_alloc(void)
 {
-        struct xresource *xrp;
-        int n;
-
-        xrp = xresv;
-        for (n = 0; n < XNRES; n++) {
-                if (xrp->xflag == 0) {
-                        xrp->xflag = 1;
-                        return xrp;
-                }
-                xrp++;
-        }
-        return NULL;
+	struct xresource *xrp;
+	int n;
+
+	xrp = xresv;
+	for (n = 0; n < XNRES; n++) {
+		if (xrp->xflag == 0) {
+			xrp->xflag = 1;
+			return xrp;
+		}
+		xrp++;
+	}
+	return NULL;
 }
 
 static void xres_free(struct xresource *xrp)
@@ -161,76 +90,71 @@ static struct resource *shmedia_find_resource(struct resource *root,
 	return NULL;
 }
 
-static unsigned long shmedia_alloc_io(unsigned long phys, unsigned long size,
-				      const char *name)
+static void __iomem *shmedia_alloc_io(unsigned long phys, unsigned long size,
+				      const char *name, unsigned long flags)
 {
-        static int printed_full = 0;
-        struct xresource *xres;
-        struct resource *res;
-        char *tack;
-        int tlen;
-
-        if (name == NULL) name = "???";
-
-        if ((xres = xres_alloc()) != 0) {
-                tack = xres->xname;
-                res = &xres->xres;
-        } else {
-                if (!printed_full) {
-                        printk("%s: done with statics, switching to kmalloc\n",
-			       __func__);
-                        printed_full = 1;
-                }
-                tlen = strlen(name);
-                tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
-                if (!tack)
-			return -ENOMEM;
-                memset(tack, 0, sizeof(struct resource));
-                res = (struct resource *) tack;
-                tack += sizeof (struct resource);
-        }
-
-        strncpy(tack, name, XNMLN);
-        tack[XNMLN] = 0;
-        res->name = tack;
-
-        return shmedia_ioremap(res, phys, size);
+	static int printed_full;
+	struct xresource *xres;
+	struct resource *res;
+	char *tack;
+	int tlen;
+
+	if (name == NULL)
+		name = "???";
+
+	xres = xres_alloc();
+	if (xres != 0) {
+		tack = xres->xname;
+		res = &xres->xres;
+	} else {
+		if (!printed_full) {
+			printk(KERN_NOTICE "%s: done with statics, "
+			       "switching to kmalloc\n", __func__);
+			printed_full = 1;
+		}
+		tlen = strlen(name);
+		tack = kmalloc(sizeof(struct resource) + tlen + 1, GFP_KERNEL);
+		if (!tack)
+			return NULL;
+		memset(tack, 0, sizeof(struct resource));
+		res = (struct resource *) tack;
+		tack += sizeof(struct resource);
+	}
+
+	strncpy(tack, name, XNMLN);
+	tack[XNMLN] = 0;
+	res->name = tack;
+
+	return shmedia_ioremap(res, phys, size, flags);
 }
 
-static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz)
+static void __iomem *shmedia_ioremap(struct resource *res, u32 pa, int sz,
+				     unsigned long flags)
 {
-        unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
+	unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
 	unsigned long round_sz = (offset + sz + PAGE_SIZE-1) & PAGE_MASK;
-        unsigned long va;
-        unsigned int psz;
+	unsigned long va;
+	unsigned int psz;
 
-        if (allocate_resource(&shmedia_iomap, res, round_sz,
+	if (allocate_resource(&shmedia_iomap, res, round_sz,
 			      shmedia_iomap.start, shmedia_iomap.end,
 			      PAGE_SIZE, NULL, NULL) != 0) {
-                panic("alloc_io_res(%s): cannot occupy\n",
-                    (res->name != NULL)? res->name: "???");
-        }
+		panic("alloc_io_res(%s): cannot occupy\n",
+		      (res->name != NULL) ? res->name : "???");
+	}
 
-        va = res->start;
-        pa &= PAGE_MASK;
+	va = res->start;
+	pa &= PAGE_MASK;
 
 	psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
 
-	/* log at boot time ... */
-	printk("mapioaddr: %6s  [%2d page%s]  va 0x%08lx   pa 0x%08x\n",
-	       ((res->name != NULL) ? res->name : "???"),
-	       psz, psz == 1 ? " " : "s", va, pa);
-
-        for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
-                shmedia_mapioaddr(pa, va);
-                va += PAGE_SIZE;
-                pa += PAGE_SIZE;
-        }
-
-        res->start += offset;
-        res->end = res->start + sz - 1;         /* not strictly necessary.. */
+	for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) {
+		shmedia_mapioaddr(pa, va, flags);
+		va += PAGE_SIZE;
+		pa += PAGE_SIZE;
+	}
 
-        return res->start;
+	return (void __iomem *)(unsigned long)(res->start + offset);
 }
 
 static void shmedia_free_io(struct resource *res)
@@ -249,14 +173,12 @@ static void shmedia_free_io(struct resource *res)
 
 static __init_refok void *sh64_get_page(void)
 {
-	extern int after_bootmem;
 	void *page;
 
-	if (after_bootmem) {
-		page = (void *)get_zeroed_page(GFP_ATOMIC);
-	} else {
+	if (after_bootmem)
+		page = (void *)get_zeroed_page(GFP_KERNEL);
+	else
 		page = alloc_bootmem_pages(PAGE_SIZE);
-	}
 
 	if (!page || ((unsigned long)page & ~PAGE_MASK))
 		panic("sh64_get_page: Out of memory already?\n");
@@ -264,17 +186,20 @@ static __init_refok void *sh64_get_page(void)
 	return page;
 }
 
-static void shmedia_mapioaddr(unsigned long pa, unsigned long va)
+static void shmedia_mapioaddr(unsigned long pa, unsigned long va,
+			      unsigned long flags)
 {
 	pgd_t *pgdp;
 	pud_t *pudp;
 	pmd_t *pmdp;
 	pte_t *ptep, pte;
 	pgprot_t prot;
-	unsigned long flags = 1; /* 1 = CB0-1 device */
 
 	pr_debug("shmedia_mapiopage pa %08lx va %08lx\n",  pa, va);
 
+	if (!flags)
+		flags = 1; /* 1 = CB0-1 device */
+
 	pgdp = pgd_offset_k(va);
 	if (pgd_none(*pgdp) || !pgd_present(*pgdp)) {
 		pudp = (pud_t *)sh64_get_page();
@@ -288,7 +213,7 @@ static void shmedia_mapioaddr(unsigned long pa, unsigned long va)
 	}
 
 	pmdp = pmd_offset(pudp, va);
-	if (pmd_none(*pmdp) || !pmd_present(*pmdp) ) {
+	if (pmd_none(*pmdp) || !pmd_present(*pmdp)) {
 		ptep = (pte_t *)sh64_get_page();
 		set_pmd(pmdp, __pmd((unsigned long)ptep + _PAGE_TABLE));
 	}
@@ -336,17 +261,19 @@ static void shmedia_unmapioaddr(unsigned long vaddr)
 	pte_clear(&init_mm, vaddr, ptep);
 }
 
-unsigned long onchip_remap(unsigned long phys, unsigned long size, const char *name)
+void __iomem *__ioremap(unsigned long offset, unsigned long size,
+			unsigned long flags)
 {
-	if (size < PAGE_SIZE)
-		size = PAGE_SIZE;
+	char name[14];
 
-	return shmedia_alloc_io(phys, size, name);
+	sprintf(name, "phys_%08x", (u32)offset);
+	return shmedia_alloc_io(offset, size, name, flags);
 }
-EXPORT_SYMBOL(onchip_remap);
+EXPORT_SYMBOL(__ioremap);
 
-void onchip_unmap(unsigned long vaddr)
+void __iounmap(void __iomem *virtual)
 {
+	unsigned long vaddr = (unsigned long)virtual & PAGE_MASK;
 	struct resource *res;
 	unsigned int psz;
 
@@ -357,10 +284,7 @@ void onchip_unmap(unsigned long vaddr)
 		return;
 	}
 
-        psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
-
-        printk(KERN_DEBUG "unmapioaddr: %6s  [%2d page%s] freed\n",
-	       res->name, psz, psz == 1 ? " " : "s");
+	psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE;
 
 	shmedia_free_io(res);
 
@@ -371,9 +295,8 @@ void onchip_unmap(unsigned long vaddr)
 		kfree(res);
 	}
 }
-EXPORT_SYMBOL(onchip_unmap);
+EXPORT_SYMBOL(__iounmap);
 
-#ifdef CONFIG_PROC_FS
 static int
 ioremap_proc_info(char *buf, char **start, off_t fpos, int length, int *eof,
 		  void *data)
@@ -385,7 +308,10 @@ ioremap_proc_info(char *buf, char **start, off_t fpos, int length, int *eof,
 	for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) {
 		if (p + 32 >= e)        /* Better than nothing */
 			break;
-		if ((nm = r->name) == 0) nm = "???";
+		nm = r->name;
+		if (nm == NULL)
+			nm = "???";
+
 		p += sprintf(p, "%08lx-%08lx: %s\n",
 			     (unsigned long)r->start,
 			     (unsigned long)r->end, nm);
@@ -393,14 +319,11 @@ ioremap_proc_info(char *buf, char **start, off_t fpos, int length, int *eof,
 
 	return p-buf;
 }
-#endif /* CONFIG_PROC_FS */
 
 static int __init register_proc_onchip(void)
 {
-#ifdef CONFIG_PROC_FS
-	create_proc_read_entry("io_map",0,0, ioremap_proc_info, &shmedia_iomap);
-#endif
+	create_proc_read_entry("io_map", 0, 0, ioremap_proc_info,
+			       &shmedia_iomap);
 	return 0;
 }
-
-__initcall(register_proc_onchip);
+late_initcall(register_proc_onchip);

drivers/serial/sh-sci.c

@@ -985,13 +985,7 @@ static void sci_config_port(struct uart_port *port, int flags)
 	port->type = s->type;
 
 	if (port->flags & UPF_IOREMAP && !port->membase) {
-#if defined(CONFIG_SUPERH64)
-		port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
-		port->membase = (void __iomem *)port->mapbase;
-#else
 		port->membase = ioremap_nocache(port->mapbase, 0x40);
-#endif
-
 		dev_err(port->dev, "can't remap port#%d\n", port->line);
 	}
 }