ARM: OMAP2: Fix sparse, checkpatch warnings fro GPMC code, use ioremap

Fix sparse, checkpatch warnings fro GPMC code.

Also change to use ioremap, and add missing function prototypes
to gpmc.h.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/gpmc.c

@@ -9,27 +9,23 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+#undef DEBUG
+
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/ioport.h>
 #include <linux/spinlock.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <mach/gpmc.h>
 
-#undef DEBUG
-
-#ifdef CONFIG_ARCH_OMAP2420
-#define GPMC_BASE		0x6800a000
-#endif
-
-#ifdef CONFIG_ARCH_OMAP2430
-#define GPMC_BASE		0x6E000000
-#endif
+#include "memory.h"
 
+/* GPMC register offsets */
 #define GPMC_REVISION		0x00
 #define GPMC_SYSCONFIG		0x10
 #define GPMC_SYSSTATUS		0x14
@@ -51,7 +47,6 @@
 #define GPMC_CS0		0x60
 #define GPMC_CS_SIZE		0x30
 
-#define GPMC_CS_NUM		8
 #define GPMC_MEM_START		0x00000000
 #define GPMC_MEM_END		0x3FFFFFFF
 #define BOOT_ROM_SPACE		0x100000	/* 1MB */
@@ -64,10 +59,9 @@ static struct resource	gpmc_cs_mem[GPMC_CS_NUM];
 static DEFINE_SPINLOCK(gpmc_mem_lock);
 static unsigned		gpmc_cs_map;
 
-static void __iomem *gpmc_base = IO_ADDRESS(GPMC_BASE);
-static void __iomem *gpmc_cs_base = IO_ADDRESS(GPMC_BASE) + GPMC_CS0;
+static void __iomem *gpmc_base;
 
-static struct clk *gpmc_fck;
+static struct clk *gpmc_l3_clk;
 
 static void gpmc_write_reg(int idx, u32 val)
 {
@@ -83,19 +77,32 @@ void gpmc_cs_write_reg(int cs, int idx, u32 val)
 {
 	void __iomem *reg_addr;
 
-	reg_addr = gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx;
+	reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
 	__raw_writel(val, reg_addr);
 }
 
 u32 gpmc_cs_read_reg(int cs, int idx)
 {
-	return __raw_readl(gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx);
+	void __iomem *reg_addr;
+
+	reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
+	return __raw_readl(reg_addr);
 }
 
+/* TODO: Add support for gpmc_fck to clock framework and use it */
 unsigned long gpmc_get_fclk_period(void)
 {
-	/* In picoseconds */
-	return 1000000000 / ((clk_get_rate(gpmc_fck)) / 1000);
+	unsigned long rate = clk_get_rate(gpmc_l3_clk);
+
+	if (rate == 0) {
+		printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
+		return 0;
+	}
+
+	rate /= 1000;
+	rate = 1000000000 / rate;	/* In picoseconds */
+
+	return rate;
 }
 
 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
@@ -108,6 +115,11 @@ unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
 	return (time_ns * 1000 + tick_ps - 1) / tick_ps;
 }
 
+unsigned int gpmc_ticks_to_ns(unsigned int ticks)
+{
+	return ticks * gpmc_get_fclk_period() / 1000;
+}
+
 unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
 {
 	unsigned long ticks = gpmc_ns_to_ticks(time_ns);
@@ -348,6 +360,7 @@ int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
 	spin_unlock(&gpmc_mem_lock);
 	return r;
 }
+EXPORT_SYMBOL(gpmc_cs_request);
 
 void gpmc_cs_free(int cs)
 {
@@ -363,8 +376,9 @@ void gpmc_cs_free(int cs)
 	gpmc_cs_set_reserved(cs, 0);
 	spin_unlock(&gpmc_mem_lock);
 }
+EXPORT_SYMBOL(gpmc_cs_free);
 
-void __init gpmc_mem_init(void)
+static void __init gpmc_mem_init(void)
 {
 	int cs;
 	unsigned long boot_rom_space = 0;
@@ -394,12 +408,33 @@ void __init gpmc_mem_init(void)
 void __init gpmc_init(void)
 {
 	u32 l;
+	char *ck;
+
+	if (cpu_is_omap24xx()) {
+		ck = "core_l3_ck";
+		if (cpu_is_omap2420())
+			l = OMAP2420_GPMC_BASE;
+		else
+			l = OMAP34XX_GPMC_BASE;
+	} else if (cpu_is_omap34xx()) {
+		ck = "gpmc_fck";
+		l = OMAP34XX_GPMC_BASE;
+	}
 
-	gpmc_fck = clk_get(NULL, "gpmc_fck"); /* Always on ENABLE_ON_INIT */
-	if (IS_ERR(gpmc_fck))
-		WARN_ON(1);
-	else
-		clk_enable(gpmc_fck);
+	gpmc_l3_clk = clk_get(NULL, ck);
+	if (IS_ERR(gpmc_l3_clk)) {
+		printk(KERN_ERR "Could not get GPMC clock %s\n", ck);
+		return -ENODEV;
+	}
+
+	gpmc_base = ioremap(l, SZ_4K);
+	if (!gpmc_base) {
+		clk_put(gpmc_l3_clk);
+		printk(KERN_ERR "Could not get GPMC register memory\n");
+		return -ENOMEM;
+	}
+
+	BUG_ON(IS_ERR(gpmc_l3_clk));
 
 	l = gpmc_read_reg(GPMC_REVISION);
 	printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);

arch/arm/plat-omap/include/mach/gpmc.h

@@ -11,6 +11,9 @@
 #ifndef __OMAP2_GPMC_H
 #define __OMAP2_GPMC_H
 
+/* Maximum Number of Chip Selects */
+#define GPMC_CS_NUM		8
+
 #define GPMC_CS_CONFIG1		0x00
 #define GPMC_CS_CONFIG2		0x04
 #define GPMC_CS_CONFIG3		0x08
@@ -81,6 +84,7 @@ struct gpmc_timings {
 };
 
 extern unsigned int gpmc_ns_to_ticks(unsigned int time_ns);
+extern unsigned int gpmc_ticks_to_ns(unsigned int ticks);
 extern unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns);
 extern unsigned long gpmc_get_fclk_period(void);
 
@@ -92,5 +96,6 @@ extern int gpmc_cs_request(int cs, unsigned long size, unsigned long *base);
 extern void gpmc_cs_free(int cs);
 extern int gpmc_cs_set_reserved(int cs, int reserved);
 extern int gpmc_cs_reserved(int cs);
+extern void gpmc_init(void);
 
 #endif

arch/arm/plat-omap/include/mach/omap24xx.h

@@ -48,6 +48,7 @@
 #define OMAP2420_PRM_BASE	OMAP2420_CM_BASE
 #define OMAP2420_SDRC_BASE	(L3_24XX_BASE + 0x9000)
 #define OMAP2420_SMS_BASE	0x68008000
+#define OMAP2420_GPMC_BASE	0x6800a000
 
 #define OMAP2430_32KSYNCT_BASE	(L4_WK_243X_BASE + 0x20000)
 #define OMAP2430_PRCM_BASE	(L4_WK_243X_BASE + 0x6000)