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rapidio, powerpc/85xx: Add MChk handler for SRIO port 

Add Machine Check exception handling into RapidIO port driver for
Freescale SoCs (MPC85xx).

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Tested-by: Thomas Moll <thomas.moll@sysgo.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2010-05-26 14:44:00 -07:00 committed by Linus Torvalds
parent 5b2074ae4f
commit a52c8f521f
1 changed files with 70 additions and 4 deletions
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74
arch/powerpc/sysdev/fsl_rio.c
View File

@ -32,6 +32,8 @@
#include <linux/kfifo.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#undef DEBUG_PW /* Port-Write debugging */
@ -47,6 +49,8 @@
#define RIO_ESCSR 0x158
#define RIO_CCSR 0x15c
#define RIO_LTLEDCSR 0x0608
#define RIO_LTLEDCSR_IER 0x80000000
#define RIO_LTLEDCSR_PRT 0x01000000
#define RIO_LTLEECSR 0x060c
#define RIO_EPWISR 0x10010
#define RIO_ISR_AACR 0x10120
@ -214,6 +218,54 @@ struct rio_priv {
spinlock_t pw_fifo_lock;
};
#define __fsl_read_rio_config(x, addr, err, op) \
__asm__ __volatile__( \
"1: "op" %1,0(%2)\n" \
" eieio\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: li %1,-1\n" \
" li %0,%3\n" \
" b 2b\n" \
".section __ex_table,\"a\"\n" \
" .align 2\n" \
" .long 1b,3b\n" \
".text" \
: "=r" (err), "=r" (x) \
: "b" (addr), "i" (-EFAULT), "0" (err))
static void __iomem *rio_regs_win;
static int (*saved_mcheck_exception)(struct pt_regs *regs);
static int fsl_rio_mcheck_exception(struct pt_regs *regs)
{
const struct exception_table_entry *entry = NULL;
unsigned long reason = (mfspr(SPRN_MCSR) & MCSR_MASK);
if (reason & MCSR_BUS_RBERR) {
reason = in_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR));
if (reason & (RIO_LTLEDCSR_IER | RIO_LTLEDCSR_PRT)) {
/* Check if we are prepared to handle this fault */
entry = search_exception_tables(regs->nip);
if (entry) {
pr_debug("RIO: %s - MC Exception handled\n",
__func__);
out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
0);
regs->msr |= MSR_RI;
regs->nip = entry->fixup;
return 1;
}
}
}
if (saved_mcheck_exception)
return saved_mcheck_exception(regs);
else
return cur_cpu_spec->machine_check(regs);
}
/**
* fsl_rio_doorbell_send - Send a MPC85xx doorbell message
* @mport: RapidIO master port info
@ -314,6 +366,7 @@ fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
{
struct rio_priv *priv = mport->priv;
u8 *data;
u32 rval, err = 0;
pr_debug
("fsl_rio_config_read: index %d destid %d hopcount %d offset %8.8x len %d\n",
@ -324,17 +377,24 @@ fsl_rio_config_read(struct rio_mport *mport, int index, u16 destid,
data = (u8 *) priv->maint_win + offset;
switch (len) {
case 1:
*val = in_8((u8 *) data);
__fsl_read_rio_config(rval, data, err, "lbz");
break;
case 2:
*val = in_be16((u16 *) data);
__fsl_read_rio_config(rval, data, err, "lhz");
break;
default:
*val = in_be32((u32 *) data);
__fsl_read_rio_config(rval, data, err, "lwz");
break;
}
return 0;
if (err) {
pr_debug("RIO: cfg_read error %d for %x:%x:%x\n",
err, destid, hopcount, offset);
}
*val = rval;
return err;
}
/**
@ -1365,6 +1425,7 @@ int fsl_rio_setup(struct of_device *dev)
rio_register_mport(port);
priv->regs_win = ioremap(regs.start, regs.end - regs.start + 1);
rio_regs_win = priv->regs_win;
/* Probe the master port phy type */
ccsr = in_be32(priv->regs_win + RIO_CCSR);
@ -1433,6 +1494,11 @@ int fsl_rio_setup(struct of_device *dev)
fsl_rio_doorbell_init(port);
fsl_rio_port_write_init(port);
saved_mcheck_exception = ppc_md.machine_check_exception;
ppc_md.machine_check_exception = fsl_rio_mcheck_exception;
/* Ensure that RFXE is set */
mtspr(SPRN_HID1, (mfspr(SPRN_HID1) | 0x20000));
return 0;
err:
iounmap(priv->regs_win);