s3c2442: R.I.P.

It is broken and it is not maintained by anyone since long time.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 34767

1 files changed, 0 insertions, 286 deletions

diff --git a/target/linux/s3c24xx/patches-2.6.30/013-fiq_c_handler.patch b/target/linux/s3c24xx/patches-2.6.30/013-fiq_c_handler.patch
deleted file mode 100644
index de12e10cd7..0000000000
--- a/target/linux/s3c24xx/patches-2.6.30/013-fiq_c_handler.patch
+++ /dev/null
@@ -1,286 +0,0 @@
---- a/arch/arm/kernel/fiq.c
-+++ b/arch/arm/kernel/fiq.c
-@@ -8,6 +8,8 @@
-  *
-  *  FIQ support re-written by Russell King to be more generic
-  *
-+ *  FIQ handler in C supoprt written by Andy Green <andy@openmoko.com>
-+ *
-  * We now properly support a method by which the FIQ handlers can
-  * be stacked onto the vector.  We still do not support sharing
-  * the FIQ vector itself.
-@@ -124,6 +126,83 @@ void __naked get_fiq_regs(struct pt_regs
- 	: "r" (&regs->ARM_r8), "I" (PSR_I_BIT | PSR_F_BIT | FIQ_MODE));
- }
- 
-+/* -------- FIQ handler in C ---------
-+ *
-+ * Major Caveats for using this
-+ *  ---------------------------
-+ *  *
-+ *  * 1) it CANNOT touch any vmalloc()'d memory, only memory
-+ *    that was kmalloc()'d.  Static allocations in the monolithic kernel
-+ *    are kmalloc()'d so they are okay.  You can touch memory-mapped IO, but
-+ *    the pointer for it has to have been stored in kmalloc'd memory.  The
-+ *    reason for this is simple: every now and then Linux turns off interrupts
-+ *    and reorders the paging tables.  If a FIQ happens during this time, the
-+ *    virtual memory space can be partly or entirely disordered or missing.
-+ *
-+ * 2) Because vmalloc() is used when a module is inserted, THIS FIQ
-+ *    ISR HAS TO BE IN THE MONOLITHIC KERNEL, not a module.  But the way
-+ *    it is set up, you can all to enable and disable it from your module
-+ *    and intercommunicate with it through struct fiq_ipc
-+ *    fiq_ipc which you can define in
-+ *    asm/archfiq_ipc_type.h.  The reason is the same as above, a
-+ *    FIQ could happen while even the ISR is not present in virtual memory
-+ *    space due to pagetables being changed at the time.
-+ *
-+ * 3) You can't call any Linux API code except simple macros
-+ *    - understand that FIQ can come in at any time, no matter what
-+ *      state of undress the kernel may privately be in, thinking it
-+ *      locked the door by turning off interrupts... FIQ is an
-+ *      unstoppable monster force (which is its value)
-+ *    - they are not vmalloc()'d memory safe
-+ *    - they might do crazy stuff like sleep: FIQ pisses fire and
-+ *      is not interested in 'sleep' that the weak seem to need
-+ *    - calling APIs from FIQ can re-enter un-renterable things
-+ *    - summary: you cannot interoperate with linux APIs directly in the FIQ ISR
-+ *
-+ * If you follow these rules, it is fantastic, an extremely powerful, solid,
-+ * genuine hard realtime feature.
-+ */
-+
-+static void (*current_fiq_c_isr)(void);
-+#define FIQ_C_ISR_STACK_SIZE 	256
-+
-+static void __attribute__((naked)) __jump_to_isr(void)
-+{
-+	asm __volatile__ ("mov pc, r8");
-+}
-+
-+
-+static void __attribute__((naked)) __actual_isr(void)
-+{
-+	asm __volatile__ (
-+		"stmdb	sp!, {r0-r12, lr};"
-+		"mov     fp, sp;"
-+	);
-+
-+	current_fiq_c_isr();
-+
-+	asm __volatile__ (
-+		"ldmia	sp!, {r0-r12, lr};"
-+		"subs	pc, lr, #4;"
-+	);
-+}
-+
-+void set_fiq_c_handler(void (*isr)(void))
-+{
-+	struct pt_regs regs;
-+
-+	memset(&regs, 0, sizeof(regs));
-+	regs.ARM_r8 = (unsigned long) __actual_isr;
-+	regs.ARM_sp = 0xffff001c + FIQ_C_ISR_STACK_SIZE;
-+
-+	set_fiq_handler(__jump_to_isr, 4);
-+
-+	current_fiq_c_isr = isr;
-+
-+	set_fiq_regs(&regs);
-+}
-+/* -------- FIQ handler in C ---------*/
-+
- int claim_fiq(struct fiq_handler *f)
- {
- 	int ret = 0;
---- a/arch/arm/include/asm/fiq.h
-+++ b/arch/arm/include/asm/fiq.h
-@@ -29,8 +29,9 @@ struct fiq_handler {
- extern int claim_fiq(struct fiq_handler *f);
- extern void release_fiq(struct fiq_handler *f);
- extern void set_fiq_handler(void *start, unsigned int length);
--extern void set_fiq_regs(struct pt_regs *regs);
--extern void get_fiq_regs(struct pt_regs *regs);
-+extern void set_fiq_c_handler(void (*handler)(void));
-+extern void __attribute__((naked)) set_fiq_regs(struct pt_regs *regs);
-+extern void __attribute__((naked)) get_fiq_regs(struct pt_regs *regs);
- extern void enable_fiq(int fiq);
- extern void disable_fiq(int fiq);
- 
---- a/arch/arm/plat-s3c24xx/include/plat/irq.h
-+++ b/arch/arm/plat-s3c24xx/include/plat/irq.h
-@@ -12,6 +12,7 @@
- 
- #include <linux/io.h>
- 
-+#include <mach/irqs.h>
- #include <mach/hardware.h>
- #include <mach/regs-irq.h>
- #include <mach/regs-gpio.h>
-@@ -31,8 +32,15 @@ s3c_irqsub_mask(unsigned int irqno, unsi
- {
- 	unsigned long mask;
- 	unsigned long submask;
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	unsigned long flags;
-+#endif
- 
- 	submask = __raw_readl(S3C2410_INTSUBMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_save_flags(flags);
-+	local_fiq_disable();
-+#endif
- 	mask = __raw_readl(S3C2410_INTMSK);
- 
- 	submask |= (1UL << (irqno - IRQ_S3CUART_RX0));
-@@ -45,6 +53,9 @@ s3c_irqsub_mask(unsigned int irqno, unsi
- 
- 	/* write back masks */
- 	__raw_writel(submask, S3C2410_INTSUBMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_irq_restore(flags);
-+#endif
- 
- }
- 
-@@ -53,8 +64,15 @@ s3c_irqsub_unmask(unsigned int irqno, un
- {
- 	unsigned long mask;
- 	unsigned long submask;
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	unsigned long flags;
-+#endif
- 
- 	submask = __raw_readl(S3C2410_INTSUBMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_save_flags(flags);
-+	local_fiq_disable();
-+#endif
- 	mask = __raw_readl(S3C2410_INTMSK);
- 
- 	submask &= ~(1UL << (irqno - IRQ_S3CUART_RX0));
-@@ -63,6 +81,9 @@ s3c_irqsub_unmask(unsigned int irqno, un
- 	/* write back masks */
- 	__raw_writel(submask, S3C2410_INTSUBMSK);
- 	__raw_writel(mask, S3C2410_INTMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_irq_restore(flags);
-+#endif
- }
- 
- 
---- a/arch/arm/plat-s3c24xx/irq.c
-+++ b/arch/arm/plat-s3c24xx/irq.c
-@@ -28,6 +28,8 @@
- #include <asm/mach/irq.h>
- 
- #include <plat/regs-irqtype.h>
-+#include <mach/regs-irq.h>
-+#include <mach/regs-gpio.h>
- 
- #include <plat/cpu.h>
- #include <plat/pm.h>
-@@ -37,12 +39,20 @@ static void
- s3c_irq_mask(unsigned int irqno)
- {
- 	unsigned long mask;
--
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	unsigned long flags;
-+#endif
- 	irqno -= IRQ_EINT0;
--
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_save_flags(flags);
-+	local_fiq_disable();
-+#endif
- 	mask = __raw_readl(S3C2410_INTMSK);
- 	mask |= 1UL << irqno;
- 	__raw_writel(mask, S3C2410_INTMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_irq_restore(flags);
-+#endif
- }
- 
- static inline void
-@@ -59,9 +69,19 @@ s3c_irq_maskack(unsigned int irqno)
- {
- 	unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
- 	unsigned long mask;
--
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	unsigned long flags;
-+#endif
-+
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_save_flags(flags);
-+	local_fiq_disable();
-+#endif
- 	mask = __raw_readl(S3C2410_INTMSK);
- 	__raw_writel(mask|bitval, S3C2410_INTMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_irq_restore(flags);
-+#endif
- 
- 	__raw_writel(bitval, S3C2410_SRCPND);
- 	__raw_writel(bitval, S3C2410_INTPND);
-@@ -72,15 +92,25 @@ static void
- s3c_irq_unmask(unsigned int irqno)
- {
- 	unsigned long mask;
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	unsigned long flags;
-+#endif
- 
- 	if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
- 		irqdbf2("s3c_irq_unmask %d\n", irqno);
- 
- 	irqno -= IRQ_EINT0;
- 
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_save_flags(flags);
-+	local_fiq_disable();
-+#endif
- 	mask = __raw_readl(S3C2410_INTMSK);
- 	mask &= ~(1UL << irqno);
- 	__raw_writel(mask, S3C2410_INTMSK);
-+#ifdef CONFIG_S3C2440_C_FIQ
-+	local_irq_restore(flags);
-+#endif
- }
- 
- struct irq_chip s3c_irq_level_chip = {
-@@ -523,26 +553,26 @@ void __init s3c24xx_init_irq(void)
- 
- 	last = 0;
- 	for (i = 0; i < 4; i++) {
--		pend = __raw_readl(S3C2410_INTPND);
-+		pend = __raw_readl(S3C2410_SUBSRCPND);
- 
- 		if (pend == 0 || pend == last)
- 			break;
- 
--		__raw_writel(pend, S3C2410_SRCPND);
--		__raw_writel(pend, S3C2410_INTPND);
--		printk("irq: clearing pending status %08x\n", (int)pend);
-+		printk("irq: clearing subpending status %08x\n", (int)pend);
-+		__raw_writel(pend, S3C2410_SUBSRCPND);
- 		last = pend;
- 	}
- 
- 	last = 0;
- 	for (i = 0; i < 4; i++) {
--		pend = __raw_readl(S3C2410_SUBSRCPND);
-+		pend = __raw_readl(S3C2410_INTPND);
- 
- 		if (pend == 0 || pend == last)
- 			break;
- 
--		printk("irq: clearing subpending status %08x\n", (int)pend);
--		__raw_writel(pend, S3C2410_SUBSRCPND);
-+		__raw_writel(pend, S3C2410_SRCPND);
-+		__raw_writel(pend, S3C2410_INTPND);
-+		printk("irq: clearing pending status %08x\n", (int)pend);
- 		last = pend;
- 	}
-