openwrt-xburst/target/linux/brcm47xx/patches-3.0/0010-bcm47xx-prepare-to-support-different-buses.patch

From c0886db6357de20fba4f7c0602eceefba3ad343b Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Mon, 6 Jun 2011 00:07:36 +0200
Subject: [PATCH 10/14] bcm47xx: prepare to support different buses

The ssb bus is not hod directly any more. there is now a union which
contains all the supported buses, now just ssb. As just one system bus
can be used at a time the union does not cause any problems.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/bcm47xx/gpio.c                     |   56 ++++++++++++++++----------
 arch/mips/bcm47xx/nvram.c                    |   15 +++++--
 arch/mips/bcm47xx/serial.c                   |   13 +++++-
 arch/mips/bcm47xx/setup.c                    |   32 +++++++++++---
 arch/mips/bcm47xx/time.c                     |    9 +++-
 arch/mips/bcm47xx/wgt634u.c                  |   13 ++++--
 arch/mips/include/asm/mach-bcm47xx/bcm47xx.h |   14 ++++++-
 arch/mips/include/asm/mach-bcm47xx/gpio.h    |   55 ++++++++++++++++++-------
 drivers/watchdog/bcm47xx_wdt.c               |   12 +++++-
 9 files changed, 158 insertions(+), 61 deletions(-)

--- a/arch/mips/bcm47xx/gpio.c
+++ b/arch/mips/bcm47xx/gpio.c
@@ -20,42 +20,54 @@ static DECLARE_BITMAP(gpio_in_use, BCM47
 
 int gpio_request(unsigned gpio, const char *tag)
 {
-	if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
-	    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
-		return -EINVAL;
-
-	if (ssb_extif_available(&ssb_bcm47xx.extif) &&
-	    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
-		return -EINVAL;
-
-	if (test_and_set_bit(gpio, gpio_in_use))
-		return -EBUSY;
-
-	return 0;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
+		    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
+			return -EINVAL;
+
+		if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
+		    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
+			return -EINVAL;
+
+		if (test_and_set_bit(gpio, gpio_in_use))
+			return -EBUSY;
+
+		return 0;
+	}
+	return -EINVAL;
 }
 EXPORT_SYMBOL(gpio_request);
 
 void gpio_free(unsigned gpio)
 {
-	if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
-	    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
-		return;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
+		    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
+			return;
+
+		if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
+		    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
+			return;
 
-	if (ssb_extif_available(&ssb_bcm47xx.extif) &&
-	    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
+		clear_bit(gpio, gpio_in_use);
 		return;
-
-	clear_bit(gpio, gpio_in_use);
+	}
 }
 EXPORT_SYMBOL(gpio_free);
 
 int gpio_to_irq(unsigned gpio)
 {
-	if (ssb_chipco_available(&ssb_bcm47xx.chipco))
-		return ssb_mips_irq(ssb_bcm47xx.chipco.dev) + 2;
-	else if (ssb_extif_available(&ssb_bcm47xx.extif))
-		return ssb_mips_irq(ssb_bcm47xx.extif.dev) + 2;
-	else
-		return -EINVAL;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco))
+			return ssb_mips_irq(bcm47xx_bus.ssb.chipco.dev) + 2;
+		else if (ssb_extif_available(&bcm47xx_bus.ssb.extif))
+			return ssb_mips_irq(bcm47xx_bus.ssb.extif.dev) + 2;
+		else
+			return -EINVAL;
+	}
+	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(gpio_to_irq);
--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -26,14 +26,21 @@ static char nvram_buf[NVRAM_SPACE];
 /* Probe for NVRAM header */
 static void early_nvram_init(void)
 {
-	struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
+	struct ssb_mipscore *mcore_ssb;
 	struct nvram_header *header;
 	int i;
-	u32 base, lim, off;
+	u32 base = 0;
+	u32 lim = 0;
+	u32 off;
 	u32 *src, *dst;
 
-	base = mcore->flash_window;
-	lim = mcore->flash_window_size;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		mcore_ssb = &bcm47xx_bus.ssb.mipscore;
+		base = mcore_ssb->flash_window;
+		lim = mcore_ssb->flash_window_size;
+		break;
+	}
 
 	off = FLASH_MIN;
 	while (off <= lim) {
--- a/arch/mips/bcm47xx/serial.c
+++ b/arch/mips/bcm47xx/serial.c
@@ -23,10 +23,10 @@ static struct platform_device uart8250_d
 	},
 };
 
-static int __init uart8250_init(void)
+static int __init uart8250_init_ssb(void)
 {
 	int i;
-	struct ssb_mipscore *mcore = &(ssb_bcm47xx.mipscore);
+	struct ssb_mipscore *mcore = &(bcm47xx_bus.ssb.mipscore);
 
 	memset(&uart8250_data, 0,  sizeof(uart8250_data));
 
@@ -45,6 +45,15 @@ static int __init uart8250_init(void)
 	return platform_device_register(&uart8250_device);
 }
 
+static int __init uart8250_init(void)
+{
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		return uart8250_init_ssb();
+	}
+	return -EINVAL;
+}
+
 module_init(uart8250_init);
 
 MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>");
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -35,15 +35,22 @@
 #include <bcm47xx.h>
 #include <asm/mach-bcm47xx/nvram.h>
 
-struct ssb_bus ssb_bcm47xx;
-EXPORT_SYMBOL(ssb_bcm47xx);
+union bcm47xx_bus bcm47xx_bus;
+EXPORT_SYMBOL(bcm47xx_bus);
+
+enum bcm47xx_bus_type bcm47xx_active_bus_type;
+EXPORT_SYMBOL(bcm47xx_active_bus_type);
 
 static void bcm47xx_machine_restart(char *command)
 {
 	printk(KERN_ALERT "Please stand by while rebooting the system...\n");
 	local_irq_disable();
 	/* Set the watchdog timer to reset immediately */
-	ssb_watchdog_timer_set(&ssb_bcm47xx, 1);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 1);
+		break;
+	}
 	while (1)
 		cpu_relax();
 }
@@ -52,7 +59,11 @@ static void bcm47xx_machine_halt(void)
 {
 	/* Disable interrupts and watchdog and spin forever */
 	local_irq_disable();
-	ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0);
+		break;
+	}
 	while (1)
 		cpu_relax();
 }
@@ -247,7 +258,7 @@ static int bcm47xx_get_invariants(struct
 	return 0;
 }
 
-void __init plat_mem_setup(void)
+static void __init bcm47xx_register_ssb(void)
 {
 	int err;
 	char buf[100];
@@ -258,12 +269,12 @@ void __init plat_mem_setup(void)
 		printk(KERN_WARNING "bcm47xx: someone else already registered"
 			" a ssb SPROM callback handler (err %d)\n", err);
 
-	err = ssb_bus_ssbbus_register(&ssb_bcm47xx, SSB_ENUM_BASE,
+	err = ssb_bus_ssbbus_register(&(bcm47xx_bus.ssb), SSB_ENUM_BASE,
 				      bcm47xx_get_invariants);
 	if (err)
 		panic("Failed to initialize SSB bus (err %d)\n", err);
 
-	mcore = &ssb_bcm47xx.mipscore;
+	mcore = &bcm47xx_bus.ssb.mipscore;
 	if (nvram_getenv("kernel_args", buf, sizeof(buf)) >= 0) {
 		if (strstr(buf, "console=ttyS1")) {
 			struct ssb_serial_port port;
@@ -276,6 +287,14 @@ void __init plat_mem_setup(void)
 			memcpy(&mcore->serial_ports[1], &port, sizeof(port));
 		}
 	}
+}
+
+void __init plat_mem_setup(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+
+	bcm47xx_active_bus_type = BCM47XX_BUS_TYPE_SSB;
+	bcm47xx_register_ssb();
 
 	_machine_restart = bcm47xx_machine_restart;
 	_machine_halt = bcm47xx_machine_halt;
--- a/arch/mips/bcm47xx/time.c
+++ b/arch/mips/bcm47xx/time.c
@@ -30,7 +30,7 @@
 
 void __init plat_time_init(void)
 {
-	unsigned long hz;
+	unsigned long hz = 0;
 
 	/*
 	 * Use deterministic values for initial counter interrupt
@@ -39,7 +39,12 @@ void __init plat_time_init(void)
 	write_c0_count(0);
 	write_c0_compare(0xffff);
 
-	hz = ssb_cpu_clock(&ssb_bcm47xx.mipscore) / 2;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		hz = ssb_cpu_clock(&bcm47xx_bus.ssb.mipscore) / 2;
+		break;
+	}
+
 	if (!hz)
 		hz = 100000000;
 
--- a/arch/mips/bcm47xx/wgt634u.c
+++ b/arch/mips/bcm47xx/wgt634u.c
@@ -108,7 +108,7 @@ static irqreturn_t gpio_interrupt(int ir
 
 	/* Interrupts are shared, check if the current one is
 	   a GPIO interrupt. */
-	if (!ssb_chipco_irq_status(&ssb_bcm47xx.chipco,
+	if (!ssb_chipco_irq_status(&bcm47xx_bus.ssb.chipco,
 				   SSB_CHIPCO_IRQ_GPIO))
 		return IRQ_NONE;
 
@@ -133,21 +133,24 @@ static int __init wgt634u_init(void)
 	 * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
 	 */
 
-	u8 *et0mac = ssb_bcm47xx.sprom.et0mac;
+	if (bcm47xx_active_bus_type != BCM47XX_BUS_TYPE_SSB)
+		return -ENODEV;
+
+	u8 *et0mac = bcm47xx_bus.ssb.sprom.et0mac;
 
 	if (et0mac[0] == 0x00 &&
 	    ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
 	     (et0mac[1] == 0x0f && et0mac[2] == 0xb5))) {
-		struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
+		struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
 
 		printk(KERN_INFO "WGT634U machine detected.\n");
 
 		if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
 				 gpio_interrupt, IRQF_SHARED,
-				 "WGT634U GPIO", &ssb_bcm47xx.chipco)) {
+				 "WGT634U GPIO", &bcm47xx_bus.ssb.chipco)) {
 			gpio_direction_input(WGT634U_GPIO_RESET);
 			gpio_intmask(WGT634U_GPIO_RESET, 1);
-			ssb_chipco_irq_mask(&ssb_bcm47xx.chipco,
+			ssb_chipco_irq_mask(&bcm47xx_bus.ssb.chipco,
 					    SSB_CHIPCO_IRQ_GPIO,
 					    SSB_CHIPCO_IRQ_GPIO);
 		}
--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
@@ -19,7 +19,17 @@
 #ifndef __ASM_BCM47XX_H
 #define __ASM_BCM47XX_H
 
-/* SSB bus */
-extern struct ssb_bus ssb_bcm47xx;
+#include <linux/ssb/ssb.h>
+
+enum bcm47xx_bus_type {
+	BCM47XX_BUS_TYPE_SSB,
+};
+
+union bcm47xx_bus {
+	struct ssb_bus ssb;
+};
+
+extern union bcm47xx_bus bcm47xx_bus;
+extern enum bcm47xx_bus_type bcm47xx_active_bus_type;
 
 #endif /* __ASM_BCM47XX_H */
--- a/arch/mips/include/asm/mach-bcm47xx/gpio.h
+++ b/arch/mips/include/asm/mach-bcm47xx/gpio.h
@@ -21,41 +21,66 @@ extern int gpio_to_irq(unsigned gpio);
 
 static inline int gpio_get_value(unsigned gpio)
 {
-	return ssb_gpio_in(&ssb_bcm47xx, 1 << gpio);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_gpio_in(&bcm47xx_bus.ssb, 1 << gpio);
+	}
+	return -EINVAL;
 }
 
 static inline void gpio_set_value(unsigned gpio, int value)
 {
-	ssb_gpio_out(&ssb_bcm47xx, 1 << gpio, value ? 1 << gpio : 0);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_gpio_out(&bcm47xx_bus.ssb, 1 << gpio,
+			     value ? 1 << gpio : 0);
+	}
 }
 
 static inline int gpio_direction_input(unsigned gpio)
 {
-	ssb_gpio_outen(&ssb_bcm47xx, 1 << gpio, 0);
-	return 0;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_gpio_outen(&bcm47xx_bus.ssb, 1 << gpio, 0);
+		return 0;
+	}
+	return -EINVAL;
 }
 
 static inline int gpio_direction_output(unsigned gpio, int value)
 {
-	/* first set the gpio out value */
-	ssb_gpio_out(&ssb_bcm47xx, 1 << gpio, value ? 1 << gpio : 0);
-	/* then set the gpio mode */
-	ssb_gpio_outen(&ssb_bcm47xx, 1 << gpio, 1 << gpio);
-	return 0;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		/* first set the gpio out value */
+		ssb_gpio_out(&bcm47xx_bus.ssb, 1 << gpio,
+			     value ? 1 << gpio : 0);
+		/* then set the gpio mode */
+		ssb_gpio_outen(&bcm47xx_bus.ssb, 1 << gpio, 1 << gpio);
+		return 0;
+	}
+	return -EINVAL;
 }
 
 static inline int gpio_intmask(unsigned gpio, int value)
 {
-	ssb_gpio_intmask(&ssb_bcm47xx, 1 << gpio,
-			 value ? 1 << gpio : 0);
-	return 0;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_gpio_intmask(&bcm47xx_bus.ssb, 1 << gpio,
+				 value ? 1 << gpio : 0);
+		return 0;
+	}
+	return -EINVAL;
 }
 
 static inline int gpio_polarity(unsigned gpio, int value)
 {
-	ssb_gpio_polarity(&ssb_bcm47xx, 1 << gpio,
-			  value ? 1 << gpio : 0);
-	return 0;
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_gpio_polarity(&bcm47xx_bus.ssb, 1 << gpio,
+				  value ? 1 << gpio : 0);
+		return 0;
+	}
+	return -EINVAL;
 }
 
 
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -54,12 +54,20 @@ static atomic_t ticks;
 static inline void bcm47xx_wdt_hw_start(void)
 {
 	/* this is 2,5s on 100Mhz clock  and 2s on 133 Mhz */
-	ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff);
+		break;
+	}
 }
 
 static inline int bcm47xx_wdt_hw_stop(void)
 {
-	return ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
+	switch (bcm47xx_active_bus_type) {
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0);
+	}
+	return -EINVAL;
 }
 
 static void bcm47xx_timer_tick(unsigned long unused)