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Sat, 18 Jan 2025 08:24:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737188687; bh=oT6x1/UPbJU0IyP7WL9HBzTJXPcBfOdY3PxFK3Y7jGo=; h=Date:Subject:To:References:From:In-Reply-To:From; b=tJYPEAJd0AGZe8PocR92lVmtXO3/z5Iez6qnLEopHkNaG9mysET1wN6YK64J2A54L hXezxApN+kM5tULa7KBXq85CYpGNAHOQ3ee5mth3wu+rprISgVfYd6tmachMo1zN9Q qoPtrFiM8xG5fB1BpYtZEsgcPGImq7imDTXiIxkgJ8aS8lco4NplDhNkk8iG5nZ+sE tkP6I1FZayrPVW/VdYAn7IoYj5hiBiCjkrP1KAui2St1/erl1EW/MbJPQebFQgEOuU T9gq+nQPuyOkqLEF+fV8x2xi0dXscw8YbIiDUY6ehlyebRH32ZwjRuEo/TszKbef9V k3JDJBx2tLuGQ== Message-ID: <907dade8-0e11-4d99-acb5-2d35ba729932@kernel.org> Date: Sat, 18 Jan 2025 09:24:42 +0100 X-Mailing-List: linux-aspeed@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v0 3/3] soc: aspeed: lpc-pcc: Add PCC controller support To: Kevin Chen , joel@jms.id.au, andrew@codeconstruct.com.au, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, elbadrym@google.com References: <20250117095217.661070-1-kevin_chen@aspeedtech.com> <20250117095217.661070-4-kevin_chen@aspeedtech.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/01/2025 10:52, Kevin Chen wrote: > Add LPC PCC controller driver to support POST code capture. > > Signed-off-by: Kevin Chen > --- This patch was never tested with your DTS and bindings. Please do not send untested code. > + > +/* > + * A2600-15 AP note > + * > + * SW workaround to prevent generating Non-Fatal-Error (NFE) > + * eSPI response when PCC is used for port I/O byte snooping > + * over eSPI. > + */ > +static int aspeed_a2600_15(struct aspeed_pcc *pcc, struct device *dev) > +{ > + struct device_node *np; > + u32 hicrb_en; > + > + /* abort if snoop is enabled */ > + np = of_find_compatible_node(dev->parent->of_node, NULL, "aspeed,ast2600-lpc-snoop"); No, don't sprinkle compatible to epxress relationship. Use proper phandles or parent-child relationship. > + if (np) { > + if (of_device_is_available(np)) { > + dev_err(dev, "A2600-15 should be applied with snoop disabled\n"); > + return -EPERM; > + } > + } > + > + /* abort if port is not 4-bytes continuous range */ > + if (pcc->port_xbits != 0x3) { > + dev_err(dev, "A2600-15 should be applied on 4-bytes continuous I/O address range\n"); > + return -EINVAL; > + } > + > + /* set SNPWADR of snoop device */ > + regmap_write(pcc->regmap, SNPWADR, pcc->port | ((pcc->port + 2) << 16)); > + > + /* set HICRB[15:14]=11b to enable ACCEPT response for SNPWADR */ > + hicrb_en = HICRB_ENSNP0D | HICRB_ENSNP1D; > + regmap_update_bits(pcc->regmap, HICRB, hicrb_en, hicrb_en); > + > + /* set HICR6[19] to extend SNPWADR to 2x range */ > + regmap_update_bits(pcc->regmap, HICR6, HICR6_EN2BMODE, HICR6_EN2BMODE); > + > + return 0; > +} > + > +static int aspeed_pcc_enable(struct aspeed_pcc *pcc, struct device *dev) > +{ > + int rc; > + > + if (pcc->a2600_15) { > + rc = aspeed_a2600_15(pcc, dev); > + if (rc) > + return rc; > + } > + > + /* record mode */ > + regmap_update_bits(pcc->regmap, PCCR0, > + PCCR0_MODE_SEL_MASK, > + pcc->rec_mode << PCCR0_MODE_SEL_SHIFT); > + > + /* port address */ > + regmap_update_bits(pcc->regmap, PCCR1, > + PCCR1_BASE_ADDR_MASK, > + pcc->port << PCCR1_BASE_ADDR_SHIFT); > + > + /* port address high bits selection or parser control */ > + regmap_update_bits(pcc->regmap, PCCR0, > + PCCR0_ADDR_SEL_MASK, > + pcc->port_hbits_select << PCCR0_ADDR_SEL_SHIFT); > + > + /* port address dont care bits */ > + regmap_update_bits(pcc->regmap, PCCR1, > + PCCR1_DONT_CARE_BITS_MASK, > + pcc->port_xbits << PCCR1_DONT_CARE_BITS_SHIFT); > + > + /* set DMA ring buffer size and enable interrupts */ > + if (pcc->dma_mode) { > + regmap_write(pcc->regmap, PCCR4, pcc->dma.addr & 0xffffffff); > + regmap_update_bits(pcc->regmap, PCCR5, PCCR5_DMA_ADDRH_MASK, > + (pcc->dma.addr >> 32) << PCCR5_DMA_ADDRH_SHIFT); > + regmap_update_bits(pcc->regmap, PCCR5, PCCR5_DMA_LEN_MASK, > + (pcc->dma.size / 4) << PCCR5_DMA_LEN_SHIFT); > + regmap_update_bits(pcc->regmap, PCCR0, > + PCCR0_EN_DMA_INT | PCCR0_EN_DMA_MODE, > + PCCR0_EN_DMA_INT | PCCR0_EN_DMA_MODE); > + } else { > + regmap_update_bits(pcc->regmap, PCCR0, PCCR0_RX_TRIG_LVL_MASK, > + PCC_FIFO_THR_4_EIGHTH << PCCR0_RX_TRIG_LVL_SHIFT); > + regmap_update_bits(pcc->regmap, PCCR0, > + PCCR0_EN_RX_TMOUT_INT | PCCR0_EN_RX_AVAIL_INT, > + PCCR0_EN_RX_TMOUT_INT | PCCR0_EN_RX_AVAIL_INT); > + } > + > + regmap_update_bits(pcc->regmap, PCCR0, PCCR0_EN, PCCR0_EN); > + > + return 0; > +} > + > +static int aspeed_pcc_probe(struct platform_device *pdev) > +{ > + int rc; > + struct aspeed_pcc *pcc; > + struct device *dev = &pdev->dev; > + uint32_t fifo_size = PAGE_SIZE; > + > + pcc = devm_kzalloc(&pdev->dev, sizeof(*pcc), GFP_KERNEL); Why not dev? > + if (!pcc) > + return -ENOMEM; > + > + pcc->dev = dev; > + rc = of_property_read_u32(dev->of_node, "port-addr", &pcc->port); Nope > + if (rc) { > + dev_err(dev, "cannot get port address\n"); > + return -ENODEV; > + } > + > + /* optional, by default: 0 -> 1-Byte mode */ > + of_property_read_u32(dev->of_node, "rec-mode", &pcc->rec_mode); Nope > + if (!is_valid_rec_mode(pcc->rec_mode)) { > + dev_err(dev, "invalid record mode: %u\n", > + pcc->rec_mode); > + return -EINVAL; > + } > + > + /* optional, by default: 0 -> no don't care bits */ > + of_property_read_u32(dev->of_node, "port-addr-xbits", &pcc->port_xbits); Nope > + > + /* > + * optional, by default: 0 -> no high address bits > + * > + * Note that when record mode is set to 1-Byte, this > + * property is ignored and the corresponding HW bits > + * behave as read/write cycle parser control with the > + * value set to 0b11 > + */ > + if (pcc->rec_mode) { > + of_property_read_u32(dev->of_node, "port-addr-hbits-select", Nope, none of these properties exist. > + &pcc->port_hbits_select); > + if (!is_valid_high_bits_select(pcc->port_hbits_select)) { > + dev_err(dev, "invalid high address bits selection: %u\n", > + pcc->port_hbits_select); > + return -EINVAL; > + } > + } else { > + pcc->port_hbits_select = 0x3; > + } > + > + /* AP note A2600-15 */ > + pcc->a2600_15 = of_property_read_bool(dev->of_node, "A2600-15"); NAK even more. > + if (pcc->a2600_15) > + dev_info(dev, "A2600-15 AP note patch is selected\n"); > +> + rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)); > + if (rc) { > + dev_err(dev, "cannot set 64-bits DMA mask\n"); > + return rc; > + } > + > + pcc->dma_mode = of_property_read_bool(dev->of_node, "dma-mode"); NAK, drop > + if (pcc->dma_mode) { > + pcc->dma.size = PCC_DMA_BUFSZ; > + pcc->dma.virt = dmam_alloc_coherent(dev, > + pcc->dma.size, > + &pcc->dma.addr, > + GFP_KERNEL); > + if (!pcc->dma.virt) { > + dev_err(dev, "cannot allocate DMA buffer\n"); > + return -ENOMEM; > + } > + > + fifo_size = roundup(pcc->dma.size, PAGE_SIZE); > + } > + > + rc = kfifo_alloc(&pcc->fifo, fifo_size, GFP_KERNEL); > + if (rc) { > + dev_err(dev, "cannot allocate kFIFO\n"); Run coccinelle on your code first. > + return -ENOMEM; > + } > + > + pcc->regmap = syscon_node_to_regmap(pdev->dev.parent->of_node); > + if (IS_ERR(pcc->regmap)) { > + dev_err(dev, "cannot map register\n"); > + return -ENODEV; > + } > + > + /* Disable PCC and DMA Mode for safety */ > + regmap_update_bits(pcc->regmap, PCCR0, PCCR0_EN | PCCR0_EN_DMA_MODE, 0); > + > + /* Clear Rx FIFO. */ > + regmap_update_bits(pcc->regmap, PCCR0, PCCR0_CLR_RX_FIFO, 1); > + > + /* Clear All interrupts status. */ > + regmap_write(pcc->regmap, PCCR2, > + PCCR2_INT_STATUS_RX_OVER | PCCR2_INT_STATUS_DMA_DONE | > + PCCR2_INT_STATUS_PATTERN_A | PCCR2_INT_STATUS_PATTERN_B); > + > + pcc->irq = platform_get_irq(pdev, 0); > + if (pcc->irq < 0) { > + dev_err(dev, "cannot get IRQ\n"); > + rc = -ENODEV; > + goto err_free_kfifo; > + } > + > + rc = devm_request_irq(dev, pcc->irq, aspeed_pcc_isr, 0, DEVICE_NAME, pcc); > + if (rc < 0) { > + dev_err(dev, "cannot request IRQ handler\n"); > + goto err_free_kfifo; > + } > + > + init_waitqueue_head(&pcc->wq); > + > + pcc->mdev_id = ida_alloc(&aspeed_pcc_ida, GFP_KERNEL); > + if (pcc->mdev_id < 0) { > + dev_err(dev, "cannot allocate ID\n"); > + return pcc->mdev_id; > + } > + > + pcc->mdev.parent = dev; > + pcc->mdev.minor = MISC_DYNAMIC_MINOR; > + pcc->mdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME, > + pcc->mdev_id); > + pcc->mdev.fops = &pcc_fops; > + rc = misc_register(&pcc->mdev); > + if (rc) { > + dev_err(dev, "cannot register misc device\n"); > + goto err_free_kfifo; > + } > + > + rc = aspeed_pcc_enable(pcc, dev); > + if (rc) { > + dev_err(dev, "cannot enable PCC\n"); > + goto err_dereg_mdev; > + } > + > + dev_set_drvdata(&pdev->dev, pcc); > + > + dev_info(dev, "module loaded\n"); Drop such function success messages, everywhere. Best regards, Krzysztof