[PATCH 1/2] P4080/eLBC: Make Freescale elbc interrupt common to elbc devices
tiejun.chen
tiejun.chen at windriver.com
Mon Oct 18 20:44:29 EST 2010
Zang Roy-R61911 wrote:
>
>> -----Original Message-----
>> From: tiejun.chen [mailto:tiejun.chen at windriver.com]
>> Sent: Monday, October 18, 2010 16:56 PM
>> To: Zang Roy-R61911
>> Cc: linux-mtd at lists.infradead.org; Wood Scott-B07421; dedekind1 at gmail.com; Lan
>> Chunhe-B25806; linuxppc-dev at ozlabs.org; akpm at linux-foundation.org;
>> dwmw2 at infradead.org; Gala Kumar-B11780
>> Subject: Re: [PATCH 1/2] P4080/eLBC: Make Freescale elbc interrupt common to
>> elbc devices
>>
>> Roy Zang wrote:
>>> Move Freescale elbc interrupt from nand dirver to elbc driver.
>>> Then all elbc devices can use the interrupt instead of ONLY nand.
>>>
>>> For former nand driver, it had the two functions:
>>>
>>> 1. detecting nand flash partitions;
>>> 2. registering elbc interrupt.
>>>
>>> Now, second function is removed to fsl_lbc.c.
>>>
>>> Signed-off-by: Lan Chunhe-B25806 <b25806 at freescale.com>
>>> Signed-off-by: Roy Zang <tie-fei.zang at freescale.com>
>>> Reviewed-by: Anton Vorontsov <cbouatmailru at gmail.com>
>>> Cc: Wood Scott-B07421 <B07421 at freescale.com>
>>> ---
>>>
>>> These two patches are based on the following commits:
>>> 1. http://lists.infradead.org/pipermail/linux-mtd/2010-
>> September/032112.html
>>> 2. http://lists.infradead.org/pipermail/linux-mtd/2010-
>> September/032110.html
>>> 3. http://lists.infradead.org/pipermail/linux-mtd/2010-
>> September/032111.html
>>> According to Anton's comment, I merge 1 & 2 together and start a new thread.
>>> Comparing the provided link:
>>> 1. Merge 1 & 2 together.
>>> 2. Some code style updates
>>> 3. Add counter protect for elbc driver remove
>>> 4. Rebase to 2.6.36-rc7
>>>
>>> Other histories from the links:
>>> V2: Comparing with v1, according to the feedback, add some decorations.
>>>
>>> V3: Comparing with v2:
>>> 1. according to the feedback, add some decorations.
>>> 2. change of_platform_driver to platform_driver
>>> 3. rebase to 2.6.36-rc4
>>>
>>> V4: Comparing with v3
>>> 1. minor fix from type unsigned int to u32
>>> 2. fix platform_driver issue.
>>> 3. add mutex for nand probe
>>>
>>> arch/powerpc/Kconfig | 7 +-
>>> arch/powerpc/include/asm/fsl_lbc.h | 33 +++-
>>> arch/powerpc/sysdev/fsl_lbc.c | 229 ++++++++++++++---
>>> drivers/mtd/nand/Kconfig | 1 +
>>> drivers/mtd/nand/fsl_elbc_nand.c | 482 +++++++++++++++------------------
>> ---
>>> 5 files changed, 425 insertions(+), 327 deletions(-)
>>>
>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>>> index 631e5a0..44df1ba 100644
>>> --- a/arch/powerpc/Kconfig
>>> +++ b/arch/powerpc/Kconfig
>>> @@ -687,9 +687,12 @@ config 4xx_SOC
>>> bool
>>>
>>> config FSL_LBC
>>> - bool
>>> + bool "Freescale Local Bus support"
>>> + depends on FSL_SOC
>>> help
>>> - Freescale Localbus support
>>> + Enables reporting of errors from the Freescale local bus
>>> + controller. Also contains some common code used by
>>> + drivers for specific local bus peripherals.
>>>
>>> config FSL_GTM
>>> bool
>>> diff --git a/arch/powerpc/include/asm/fsl_lbc.h
>> b/arch/powerpc/include/asm/fsl_lbc.h
>>> index 1b5a210..0c40c05 100644
>>> --- a/arch/powerpc/include/asm/fsl_lbc.h
>>> +++ b/arch/powerpc/include/asm/fsl_lbc.h
>>> @@ -1,9 +1,10 @@
>>> /* Freescale Local Bus Controller
>>> *
>>> - * Copyright (c) 2006-2007 Freescale Semiconductor
>>> + * Copyright (c) 2006-2007, 2010 Freescale Semiconductor
>>> *
>>> * Authors: Nick Spence <nick.spence at freescale.com>,
>>> * Scott Wood <scottwood at freescale.com>
>>> + * Jack Lan <jack.lan at freescale.com>
>>> *
>>> * This program is free software; you can redistribute it and/or modify
>>> * it under the terms of the GNU General Public License as published by
>>> @@ -26,6 +27,8 @@
>>> #include <linux/compiler.h>
>>> #include <linux/types.h>
>>> #include <linux/io.h>
>>> +#include <linux/device.h>
>>> +#include <linux/spinlock.h>
>>>
>>> struct fsl_lbc_bank {
>>> __be32 br; /**< Base Register */
>>> @@ -125,13 +128,23 @@ struct fsl_lbc_regs {
>>> #define LTESR_ATMW 0x00800000
>>> #define LTESR_ATMR 0x00400000
>>> #define LTESR_CS 0x00080000
>>> +#define LTESR_UPM 0x00000002
>>> #define LTESR_CC 0x00000001
>>> #define LTESR_NAND_MASK (LTESR_FCT | LTESR_PAR | LTESR_CC)
>>> +#define LTESR_MASK (LTESR_BM | LTESR_FCT | LTESR_PAR | LTESR_WP \
>>> + | LTESR_ATMW | LTESR_ATMR | LTESR_CS | LTESR_UPM \
>>> + | LTESR_CC)
>>> +#define LTESR_CLEAR 0xFFFFFFFF
>>> +#define LTECCR_CLEAR 0xFFFFFFFF
>>> +#define LTESR_STATUS LTESR_MASK
>>> +#define LTEIR_ENABLE LTESR_MASK
>>> +#define LTEDR_ENABLE 0x00000000
>>> __be32 ltedr; /**< Transfer Error Disable Register */
>>> __be32 lteir; /**< Transfer Error Interrupt Register */
>>> __be32 lteatr; /**< Transfer Error Attributes Register */
>>> __be32 ltear; /**< Transfer Error Address Register */
>>> - u8 res6[0xC];
>>> + __be32 lteccr; /**< Transfer Error ECC Register */
>>> + u8 res6[0x8];
>>> __be32 lbcr; /**< Configuration Register */
>>> #define LBCR_LDIS 0x80000000
>>> #define LBCR_LDIS_SHIFT 31
>>> @@ -265,7 +278,23 @@ static inline void fsl_upm_end_pattern(struct fsl_upm
>> *upm)
>>> cpu_relax();
>>> }
>>>
>>> +/* overview of the fsl lbc controller */
>>> +
>>> +struct fsl_lbc_ctrl {
>>> + /* device info */
>>> + struct device *dev;
>>> + struct fsl_lbc_regs __iomem *regs;
>>> + int irq;
>>> + wait_queue_head_t irq_wait;
>>> + spinlock_t lock;
>>> + void *nand;
>>> +
>>> + /* status read from LTESR by irq handler */
>>> + unsigned int irq_status;
>>> +};
>>> +
>>> extern int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base,
>>> u32 mar);
>>> +extern struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
>>>
>>> #endif /* __ASM_FSL_LBC_H */
>>> diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
>>> index dceb8d1..4bb0336 100644
>>> --- a/arch/powerpc/sysdev/fsl_lbc.c
>>> +++ b/arch/powerpc/sysdev/fsl_lbc.c
>>> @@ -2,8 +2,11 @@
>>> * Freescale LBC and UPM routines.
>>> *
>>> * Copyright (c) 2007-2008 MontaVista Software, Inc.
>>> + * Copyright (c) 2010 Freescale Semiconductor
>>> *
>>> * Author: Anton Vorontsov <avorontsov at ru.mvista.com>
>>> + * Author: Jack Lan <Jack.Lan at freescale.com>
>>> + * Author: Roy Zang <tie-fei.zang at freescale.com>
>>> *
>>> * This program is free software; you can redistribute it and/or modify
>>> * it under the terms of the GNU General Public License as published by
>>> @@ -19,39 +22,16 @@
>>> #include <linux/types.h>
>>> #include <linux/io.h>
>>> #include <linux/of.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/mod_devicetable.h>
>>> #include <asm/prom.h>
>>> #include <asm/fsl_lbc.h>
>>>
>>> static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock);
>>> -static struct fsl_lbc_regs __iomem *fsl_lbc_regs;
>>> -
>>> -static char __initdata *compat_lbc[] = {
>>> - "fsl,pq2-localbus",
>>> - "fsl,pq2pro-localbus",
>>> - "fsl,pq3-localbus",
>>> - "fsl,elbc",
>>> -};
>>> -
>>> -static int __init fsl_lbc_init(void)
>>> -{
>>> - struct device_node *lbus;
>>> - int i;
>>> -
>>> - for (i = 0; i < ARRAY_SIZE(compat_lbc); i++) {
>>> - lbus = of_find_compatible_node(NULL, NULL, compat_lbc[i]);
>>> - if (lbus)
>>> - goto found;
>>> - }
>>> - return -ENODEV;
>>> -
>>> -found:
>>> - fsl_lbc_regs = of_iomap(lbus, 0);
>>> - of_node_put(lbus);
>>> - if (!fsl_lbc_regs)
>>> - return -ENOMEM;
>>> - return 0;
>>> -}
>>> -arch_initcall(fsl_lbc_init);
>>> +struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
>>> +EXPORT_SYMBOL(fsl_lbc_ctrl_dev);
>>>
>>> /**
>>> * fsl_lbc_find - find Localbus bank
>>> @@ -65,13 +45,15 @@ arch_initcall(fsl_lbc_init);
>>> int fsl_lbc_find(phys_addr_t addr_base)
>>> {
>>> int i;
>>> + struct fsl_lbc_regs __iomem *lbc;
>>>
>>> - if (!fsl_lbc_regs)
>>> + if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
>>> return -ENODEV;
>>>
>>> - for (i = 0; i < ARRAY_SIZE(fsl_lbc_regs->bank); i++) {
>>> - __be32 br = in_be32(&fsl_lbc_regs->bank[i].br);
>>> - __be32 or = in_be32(&fsl_lbc_regs->bank[i].or);
>>> + lbc = fsl_lbc_ctrl_dev->regs;
>>> + for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) {
>>> + __be32 br = in_be32(&lbc->bank[i].br);
>>> + __be32 or = in_be32(&lbc->bank[i].or);
>>>
>>> if (br & BR_V && (br & or & BR_BA) == addr_base)
>>> return i;
>>> @@ -94,22 +76,27 @@ int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm
>> *upm)
>>> {
>>> int bank;
>>> __be32 br;
>>> + struct fsl_lbc_regs __iomem *lbc;
>>>
>>> bank = fsl_lbc_find(addr_base);
>>> if (bank < 0)
>>> return bank;
>>>
>>> - br = in_be32(&fsl_lbc_regs->bank[bank].br);
>>> + if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
>>> + return -ENODEV;
>>> +
>>> + lbc = fsl_lbc_ctrl_dev->regs;
>>> + br = in_be32(&lbc->bank[bank].br);
>>>
>>> switch (br & BR_MSEL) {
>>> case BR_MS_UPMA:
>>> - upm->mxmr = &fsl_lbc_regs->mamr;
>>> + upm->mxmr = &lbc->mamr;
>>> break;
>>> case BR_MS_UPMB:
>>> - upm->mxmr = &fsl_lbc_regs->mbmr;
>>> + upm->mxmr = &lbc->mbmr;
>>> break;
>>> case BR_MS_UPMC:
>>> - upm->mxmr = &fsl_lbc_regs->mcmr;
>>> + upm->mxmr = &lbc->mcmr;
>>> break;
>>> default:
>>> return -EINVAL;
>>> @@ -148,9 +135,12 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void
>> __iomem *io_base, u32 mar)
>>> int ret = 0;
>>> unsigned long flags;
>>>
>>> + if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
>>> + return -ENODEV;
>>> +
>>> spin_lock_irqsave(&fsl_lbc_lock, flags);
>>>
>>> - out_be32(&fsl_lbc_regs->mar, mar);
>>> + out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar);
>>>
>>> switch (upm->width) {
>>> case 8:
>>> @@ -172,3 +162,166 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void
>> __iomem *io_base, u32 mar)
>>> return ret;
>>> }
>>> EXPORT_SYMBOL(fsl_upm_run_pattern);
>>> +
>>> +static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl)
>>> +{
>>> + struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
>>> +
>>> + /* clear event registers */
>>> + setbits32(&lbc->ltesr, LTESR_CLEAR);
>>> + out_be32(&lbc->lteatr, 0);
>>> + out_be32(&lbc->ltear, 0);
>>> + out_be32(&lbc->lteccr, LTECCR_CLEAR);
>>> + out_be32(&lbc->ltedr, LTEDR_ENABLE);
>>> +
>>> + /* Enable interrupts for any detected events */
>>> + out_be32(&lbc->lteir, LTEIR_ENABLE);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/*
>>> + * NOTE: This interrupt is used to report localbus events of various kinds,
>>> + * such as transaction errors on the chipselects.
>>> + */
>>> +
>>> +static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data)
>>> +{
>>> + struct fsl_lbc_ctrl *ctrl = data;
>>> + struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
>>> + u32 status;
>>> +
>>> + status = in_be32(&lbc->ltesr);
>>> + if (!status)
>>> + return IRQ_NONE;
>>> +
>>> + out_be32(&lbc->ltesr, LTESR_CLEAR);
>>> + out_be32(&lbc->lteatr, 0);
>>> + out_be32(&lbc->ltear, 0);
>>> + ctrl->irq_status = status;
>>> +
>>> + if (status & LTESR_BM)
>>> + dev_err(ctrl->dev, "Local bus monitor time-out: "
>>> + "LTESR 0x%08X\n", status);
>>> + if (status & LTESR_WP)
>>> + dev_err(ctrl->dev, "Write protect error: "
>>> + "LTESR 0x%08X\n", status);
>>> + if (status & LTESR_ATMW)
>>> + dev_err(ctrl->dev, "Atomic write error: "
>>> + "LTESR 0x%08X\n", status);
>>> + if (status & LTESR_ATMR)
>>> + dev_err(ctrl->dev, "Atomic read error: "
>>> + "LTESR 0x%08X\n", status);
>>> + if (status & LTESR_CS)
>>> + dev_err(ctrl->dev, "Chip select error: "
>>> + "LTESR 0x%08X\n", status);
>>> + if (status & LTESR_UPM)
>>> + ;
>>> + if (status & LTESR_FCT) {
>>> + dev_err(ctrl->dev, "FCM command time-out: "
>>> + "LTESR 0x%08X\n", status);
>>> + smp_wmb();
>>> + wake_up(&ctrl->irq_wait);
>>> + }
>>> + if (status & LTESR_PAR) {
>>> + dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: "
>>> + "LTESR 0x%08X\n", status);
>>> + smp_wmb();
>>> + wake_up(&ctrl->irq_wait);
>>> + }
>>> + if (status & LTESR_CC) {
>>> + smp_wmb();
>>> + wake_up(&ctrl->irq_wait);
>>> + }
>>> + if (status & ~LTESR_MASK)
>>> + dev_err(ctrl->dev, "Unknown error: "
>>> + "LTESR 0x%08X\n", status);
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +/*
>>> + * fsl_lbc_ctrl_probe
>>> + *
>>> + * called by device layer when it finds a device matching
>>> + * one our driver can handled. This code allocates all of
>>> + * the resources needed for the controller only. The
>>> + * resources for the NAND banks themselves are allocated
>>> + * in the chip probe function.
>>> +*/
>>> +
>>> +static int __devinit fsl_lbc_ctrl_probe(struct platform_device *dev)
>>> +{
>>> + int ret;
>>> +
>>> + if (!dev->dev.of_node) {
>>> + dev_err(&dev->dev, "Device OF-Node is NULL");
>>> + return -EFAULT;
>>> + }
>>> +
>>> + fsl_lbc_ctrl_dev = kzalloc(sizeof(*fsl_lbc_ctrl_dev), GFP_KERNEL);
>>> + if (!fsl_lbc_ctrl_dev)
>>> + return -ENOMEM;
>>> +
>>> + dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev);
>>> +
>>> + spin_lock_init(&fsl_lbc_ctrl_dev->lock);
>>> + init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait);
>>> +
>>> + fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
>>> + if (!fsl_lbc_ctrl_dev->regs) {
>>> + dev_err(&dev->dev, "failed to get memory region\n");
>>> + ret = -ENODEV;
>>> + goto err;
>> Looks you always iounmap(fsl_lbc_ctrl_dev->regs) on position 'err' but here
>> of_iomap() is already failed you should skip iounmap() fsl_lbc_ctrl_dev->regs
>> again. So you should improve that as the following on 'err', or layout 'err'
>> in
>> gain.
>> ------
>> if(fsl_lbc_ctrl_dev->regs)
>> iounmap(fsl_lbc_ctrl_dev->regs);
>>
>> Tiejun
>
> You are right!
> How about
>
> if (!fsl_lbc_ctrl_dev->regs) {
> dev_err(&dev->dev, "failed to get memory region\n");
> kfree(fsl_lbc_ctrl_dev);
> return -ENOMEM;
> }
Although this is a big problem, I prefer to return 'ENXIO' :)
Others are fine to me.
Tiejun
>
> ...
>
> Thanks.
> Roy
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