Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754976AbZDZV6m (ORCPT ); Sun, 26 Apr 2009 17:58:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753860AbZDZV6a (ORCPT ); Sun, 26 Apr 2009 17:58:30 -0400 Received: from khc.piap.pl ([195.187.100.11]:55419 "EHLO khc.piap.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752130AbZDZV63 (ORCPT ); Sun, 26 Apr 2009 17:58:29 -0400 To: Benoit LIETAER , John Woods Cc: lkml , Subject: IXP42x rev. A0 support for network devices From: Krzysztof Halasa Date: Sun, 26 Apr 2009 23:58:27 +0200 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3408 Lines: 105 Hi, well, I finally found that old prototype board with IXP425 rev A0 and I was even able to implant some modern RedBoot to it, so I gave it a try. It seems that a list of rev. A0 bugs (or "bugs") isn't that long after all (those affecting Ethernet at least). Basically the QMgr IRQ status is unreliable, and the undocumented "feature" register is write-only. This patch is a bit of handcraft but it applies to 2.6.29 and probably to older kernels. Benoit, John, please let me know if it works or not. Thanks. -- Krzysztof Halasa --- a/arch/arm/mach-ixp4xx/include/mach/cpu.h +++ b/arch/arm/mach-ixp4xx/include/mach/cpu.h @@ -26,6 +26,8 @@ #define IXP46X_PROCESSOR_ID_VALUE 0x69054200 #define IXP46X_PROCESSOR_ID_MASK 0xfffffff0 +#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP4XX_PROCESSOR_ID_MASK | 0xF)) == \ + IXP42X_PROCESSOR_ID_VALUE) #define cpu_is_ixp42x() ((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \ IXP42X_PROCESSOR_ID_VALUE) #define cpu_is_ixp43x() ((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \ @@ -35,6 +35,9 @@ { unsigned int val = ~*IXP4XX_EXP_CFG2; val &= ~IXP4XX_FEATURE_RESERVED; + if (cpu_is_ixp42x_rev_a0()) + return ~IXP4XX_FEATURE_IXP46X_ONLY & ~(IXP4XX_FEATURE_RCOMP | + IXP4XX_FEATURE_AES); if (!cpu_is_ixp46x()) val &= ~IXP4XX_FEATURE_IXP46X_ONLY; --- a/arch/arm/mach-ixp4xx/ixp4xx_npe.c +++ b/arch/arm/mach-ixp4xx/ixp4xx_npe.c @@ -386,15 +386,6 @@ static int npe_reset(struct npe *npe) /* reset the NPE */ ixp4xx_write_feature_bits(val & ~(IXP4XX_FEATURE_RESET_NPEA << npe->id)); - for (i = 0; i < MAX_RETRIES; i++) { - if (!(ixp4xx_read_feature_bits() & - (IXP4XX_FEATURE_RESET_NPEA << npe->id))) - break; /* reset completed */ - udelay(1); - } - if (i == MAX_RETRIES) - return -ETIMEDOUT; - /* deassert reset */ ixp4xx_write_feature_bits(val | (IXP4XX_FEATURE_RESET_NPEA << npe->id)); --- a/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c +++ b/arch/arm/mach-ixp4xx/ixp4xx_qmgr.c @@ -41,6 +41,31 @@ void qmgr_set_irq(unsigned int queue, int src, } +static irqreturn_t qmgr_irq1_a0(int irq, void *pdev) +{ + int i, ret = 0; + + /* ACK - it may also clear newly requested irqs so don't rely on it */ + __raw_writel(__raw_readl(&qmgr_regs->irqstat[0]), + &qmgr_regs->irqstat[0]); + + for (i = 0; i < HALF_QUEUES; i++) { + u32 src, stat; + if (!(qmgr_regs->irqen[0] & BIT(i))) + continue; + src = qmgr_regs->irqsrc[i >> 3]; + stat = qmgr_regs->stat1[i >> 3]; + if (src & 4) /* the IRQ condition is inverted */ + stat = ~stat; + if (stat & BIT(src & 3)) { + irq_handlers[i](irq_pdevs[i]); + ret = IRQ_HANDLED; + } + } + return ret; +} + + static irqreturn_t qmgr_irq1(int irq, void *pdev) { int i; @@ -250,8 +275,8 @@ static int qmgr_init(void) for (i = 0; i < QUEUES; i++) __raw_writel(0, &qmgr_regs->sram[i]); - err = request_irq(IRQ_IXP4XX_QM1, qmgr_irq1, 0, - "IXP4xx Queue Manager", NULL); + err = request_irq(IRQ_IXP4XX_QM1, cpu_is_ixp42x_rev_a0() ? qmgr_irq1_a0 + : qmgr_irq1, 0, "IXP4xx Queue Manager", NULL); if (err) { printk(KERN_ERR "qmgr: failed to request IRQ%i\n", IRQ_IXP4XX_QM1); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/