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[2620:137:e000::1:20]) by mx.google.com with ESMTP id d21-20020aa7d5d5000000b004ab1736d82csi4423735eds.354.2023.02.09.23.33.01; Thu, 09 Feb 2023 23:33:24 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231470AbjBJH2D (ORCPT + 99 others); Fri, 10 Feb 2023 02:28:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231219AbjBJH1y (ORCPT ); Fri, 10 Feb 2023 02:27:54 -0500 Received: from twspam01.aspeedtech.com (twspam01.aspeedtech.com [211.20.114.71]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05C3B60E4D; Thu, 9 Feb 2023 23:27:51 -0800 (PST) Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 31A7EWrp068845; Fri, 10 Feb 2023 15:14:33 +0800 (GMT-8) (envelope-from chiawei_wang@aspeedtech.com) Received: from Chiawei-PC03.aspeed.com (192.168.2.66) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 10 Feb 2023 15:26:47 +0800 From: Chia-Wei Wang To: , , , , , , , , , , , Subject: [PATCH 2/4] soc: aspeed: Add UART DMA support Date: Fri, 10 Feb 2023 15:26:41 +0800 Message-ID: <20230210072643.2772-3-chiawei_wang@aspeedtech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230210072643.2772-1-chiawei_wang@aspeedtech.com> References: <20230210072643.2772-1-chiawei_wang@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.66] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 31A7EWrp068845 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757428479887513748?= X-GMAIL-MSGID: =?utf-8?q?1757428479887513748?= This driver provides DMA support for AST26xx UART and VUART devices. It is useful to offload CPU overhead while using UART/VUART for binary file transfer. Signed-off-by: Chia-Wei Wang --- drivers/soc/aspeed/Kconfig | 9 + drivers/soc/aspeed/Makefile | 1 + drivers/soc/aspeed/aspeed-udma.c | 447 +++++++++++++++++++++++++ include/linux/soc/aspeed/aspeed-udma.h | 34 ++ 4 files changed, 491 insertions(+) create mode 100644 drivers/soc/aspeed/aspeed-udma.c create mode 100644 include/linux/soc/aspeed/aspeed-udma.h diff --git a/drivers/soc/aspeed/Kconfig b/drivers/soc/aspeed/Kconfig index f579ee0b5afa..c3bb238bea75 100644 --- a/drivers/soc/aspeed/Kconfig +++ b/drivers/soc/aspeed/Kconfig @@ -52,6 +52,15 @@ config ASPEED_SOCINFO help Say yes to support decoding of ASPEED BMC information. +config ASPEED_UDMA + tristate "Aspeed UDMA Engine Driver" + default ARCH_ASPEED + help + Enable support for the Aspeed UDMA Engine found on the + Aspeed AST26xx SOCs. The UDMA engine provides UART DMA + operations between the memory buffer and UART/VUART + FIFO data. + endmenu endif diff --git a/drivers/soc/aspeed/Makefile b/drivers/soc/aspeed/Makefile index b35d74592964..5aeabafee1d4 100644 --- a/drivers/soc/aspeed/Makefile +++ b/drivers/soc/aspeed/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o obj-$(CONFIG_ASPEED_UART_ROUTING) += aspeed-uart-routing.o obj-$(CONFIG_ASPEED_P2A_CTRL) += aspeed-p2a-ctrl.o obj-$(CONFIG_ASPEED_SOCINFO) += aspeed-socinfo.o +obj-$(CONFIG_ASPEED_UDMA) += aspeed-udma.o diff --git a/drivers/soc/aspeed/aspeed-udma.c b/drivers/soc/aspeed/aspeed-udma.c new file mode 100644 index 000000000000..95898fbd6ed8 --- /dev/null +++ b/drivers/soc/aspeed/aspeed-udma.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) Aspeed Technology Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DEVICE_NAME "aspeed-udma" + +/* UART DMA registers offset */ +#define UDMA_TX_DMA_EN 0x000 +#define UDMA_RX_DMA_EN 0x004 +#define UDMA_TIMEOUT_TIMER 0x00c +#define UDMA_TX_DMA_RST 0x020 +#define UDMA_RX_DMA_RST 0x024 +#define UDMA_TX_DMA_INT_EN 0x030 +#define UDMA_TX_DMA_INT_STAT 0x034 +#define UDMA_RX_DMA_INT_EN 0x038 +#define UDMA_RX_DMA_INT_STAT 0x03c + +#define UDMA_CHX_OFF(x) ((x) * 0x20) +#define UDMA_CHX_TX_RD_PTR(x) (0x040 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_TX_WR_PTR(x) (0x044 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_TX_BUF_BASE(x) (0x048 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_TX_CTRL(x) (0x04c + UDMA_CHX_OFF(x)) +#define UDMA_TX_CTRL_TMOUT_DISABLE BIT(4) +#define UDMA_TX_CTRL_BUFSZ_MASK GENMASK(3, 0) +#define UDMA_TX_CTRL_BUFSZ_SHIFT 0 +#define UDMA_CHX_RX_RD_PTR(x) (0x050 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_RX_WR_PTR(x) (0x054 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_RX_BUF_BASE(x) (0x058 + UDMA_CHX_OFF(x)) +#define UDMA_CHX_RX_CTRL(x) (0x05c + UDMA_CHX_OFF(x)) +#define UDMA_RX_CTRL_TMOUT_DISABLE BIT(4) +#define UDMA_RX_CTRL_BUFSZ_MASK GENMASK(3, 0) +#define UDMA_RX_CTRL_BUFSZ_SHIFT 0 + +#define UDMA_MAX_CHANNEL 14 +#define UDMA_TIMEOUT 0x200 + +enum aspeed_udma_bufsz_code { + UDMA_BUFSZ_CODE_1KB, + UDMA_BUFSZ_CODE_4KB, + UDMA_BUFSZ_CODE_16KB, + UDMA_BUFSZ_CODE_64KB, + + /* + * 128KB and above are supported ONLY for + * virtual UARTs. For physical UARTs, the + * size code is wrapped around at the 64K + * boundary. + */ + UDMA_BUFSZ_CODE_128KB, + UDMA_BUFSZ_CODE_256KB, + UDMA_BUFSZ_CODE_512KB, + UDMA_BUFSZ_CODE_1024KB, + UDMA_BUFSZ_CODE_2048KB, + UDMA_BUFSZ_CODE_4096KB, + UDMA_BUFSZ_CODE_8192KB, + UDMA_BUFSZ_CODE_16384KB, +}; + +struct aspeed_udma_chan { + dma_addr_t dma_addr; + + struct circ_buf *rb; + u32 rb_sz; + + aspeed_udma_cb_t cb; + void *cb_arg; + + bool dis_tmout; +}; + +struct aspeed_udma { + struct device *dev; + u8 __iomem *regs; + int irq; + struct aspeed_udma_chan tx_chs[UDMA_MAX_CHANNEL]; + struct aspeed_udma_chan rx_chs[UDMA_MAX_CHANNEL]; + spinlock_t lock; +}; + +struct aspeed_udma udma[1]; + +static int aspeed_udma_get_bufsz_code(u32 buf_sz) +{ + switch (buf_sz) { + case 0x400: + return UDMA_BUFSZ_CODE_1KB; + case 0x1000: + return UDMA_BUFSZ_CODE_4KB; + case 0x4000: + return UDMA_BUFSZ_CODE_16KB; + case 0x10000: + return UDMA_BUFSZ_CODE_64KB; + case 0x20000: + return UDMA_BUFSZ_CODE_128KB; + case 0x40000: + return UDMA_BUFSZ_CODE_256KB; + case 0x80000: + return UDMA_BUFSZ_CODE_512KB; + case 0x100000: + return UDMA_BUFSZ_CODE_1024KB; + case 0x200000: + return UDMA_BUFSZ_CODE_2048KB; + case 0x400000: + return UDMA_BUFSZ_CODE_4096KB; + case 0x800000: + return UDMA_BUFSZ_CODE_8192KB; + case 0x1000000: + return UDMA_BUFSZ_CODE_16384KB; + default: + return -1; + } + + return -1; +} + +static u32 aspeed_udma_get_tx_rptr(u32 ch_no) +{ + return readl(udma->regs + UDMA_CHX_TX_RD_PTR(ch_no)); +} + +static u32 aspeed_udma_get_rx_wptr(u32 ch_no) +{ + return readl(udma->regs + UDMA_CHX_RX_WR_PTR(ch_no)); +} + +static void aspeed_udma_set_ptr(u32 ch_no, u32 ptr, bool is_tx) +{ + writel(ptr, udma->regs + + ((is_tx) ? UDMA_CHX_TX_WR_PTR(ch_no) : UDMA_CHX_RX_RD_PTR(ch_no))); +} + +void aspeed_udma_set_tx_wptr(u32 ch_no, u32 wptr) +{ + aspeed_udma_set_ptr(ch_no, wptr, true); +} +EXPORT_SYMBOL(aspeed_udma_set_tx_wptr); + +void aspeed_udma_set_rx_rptr(u32 ch_no, u32 rptr) +{ + aspeed_udma_set_ptr(ch_no, rptr, false); +} +EXPORT_SYMBOL(aspeed_udma_set_rx_rptr); + +static int aspeed_udma_free_chan(u32 ch_no, bool is_tx) +{ + u32 reg; + unsigned long flags; + + if (ch_no > UDMA_MAX_CHANNEL) + return -EINVAL; + + spin_lock_irqsave(&udma->lock, flags); + + reg = readl(udma->regs + + ((is_tx) ? UDMA_TX_DMA_INT_EN : UDMA_RX_DMA_INT_EN)); + reg &= ~(0x1 << ch_no); + + writel(reg, udma->regs + + ((is_tx) ? UDMA_TX_DMA_INT_EN : UDMA_RX_DMA_INT_EN)); + + spin_unlock_irqrestore(&udma->lock, flags); + + return 0; +} + +int aspeed_udma_free_tx_chan(u32 ch_no) +{ + return aspeed_udma_free_chan(ch_no, true); +} +EXPORT_SYMBOL(aspeed_udma_free_tx_chan); + +int aspeed_udma_free_rx_chan(u32 ch_no) +{ + return aspeed_udma_free_chan(ch_no, false); +} +EXPORT_SYMBOL(aspeed_udma_free_rx_chan); + +static int aspeed_udma_request_chan(u32 ch_no, dma_addr_t addr, + struct circ_buf *rb, u32 rb_sz, + aspeed_udma_cb_t cb, void *id, bool dis_tmout, bool is_tx) +{ + int retval = 0; + int rbsz_code; + + u32 reg; + unsigned long flags; + struct aspeed_udma_chan *ch; + + if (ch_no > UDMA_MAX_CHANNEL) { + retval = -EINVAL; + goto out; + } + + if (IS_ERR_OR_NULL(rb) || IS_ERR_OR_NULL(rb->buf)) { + retval = -EINVAL; + goto out; + } + + rbsz_code = aspeed_udma_get_bufsz_code(rb_sz); + if (rbsz_code < 0) { + retval = -EINVAL; + goto out; + } + + spin_lock_irqsave(&udma->lock, flags); + + if (is_tx) { + reg = readl(udma->regs + UDMA_TX_DMA_INT_EN); + if (reg & (0x1 << ch_no)) { + retval = -EBUSY; + goto unlock_n_out; + } + + reg |= (0x1 << ch_no); + writel(reg, udma->regs + UDMA_TX_DMA_INT_EN); + + reg = readl(udma->regs + UDMA_CHX_TX_CTRL(ch_no)); + reg |= (dis_tmout) ? UDMA_TX_CTRL_TMOUT_DISABLE : 0; + reg |= (rbsz_code << UDMA_TX_CTRL_BUFSZ_SHIFT) & UDMA_TX_CTRL_BUFSZ_MASK; + writel(reg, udma->regs + UDMA_CHX_TX_CTRL(ch_no)); + + writel(addr, udma->regs + UDMA_CHX_TX_BUF_BASE(ch_no)); + } else { + reg = readl(udma->regs + UDMA_RX_DMA_INT_EN); + if (reg & (0x1 << ch_no)) { + retval = -EBUSY; + goto unlock_n_out; + } + + reg |= (0x1 << ch_no); + writel(reg, udma->regs + UDMA_RX_DMA_INT_EN); + + reg = readl(udma->regs + UDMA_CHX_RX_CTRL(ch_no)); + reg |= (dis_tmout) ? UDMA_RX_CTRL_TMOUT_DISABLE : 0; + reg |= (rbsz_code << UDMA_RX_CTRL_BUFSZ_SHIFT) & UDMA_RX_CTRL_BUFSZ_MASK; + writel(reg, udma->regs + UDMA_CHX_RX_CTRL(ch_no)); + + writel(addr, udma->regs + UDMA_CHX_RX_BUF_BASE(ch_no)); + } + + ch = (is_tx) ? &udma->tx_chs[ch_no] : &udma->rx_chs[ch_no]; + ch->rb = rb; + ch->rb_sz = rb_sz; + ch->cb = cb; + ch->cb_arg = id; + ch->dma_addr = addr; + ch->dis_tmout = dis_tmout; + +unlock_n_out: + spin_unlock_irqrestore(&udma->lock, flags); +out: + return 0; +} + +int aspeed_udma_request_tx_chan(u32 ch_no, dma_addr_t addr, + struct circ_buf *rb, u32 rb_sz, + aspeed_udma_cb_t cb, void *id, bool dis_tmout) +{ + return aspeed_udma_request_chan(ch_no, addr, rb, rb_sz, cb, id, + dis_tmout, true); +} +EXPORT_SYMBOL(aspeed_udma_request_tx_chan); + +int aspeed_udma_request_rx_chan(u32 ch_no, dma_addr_t addr, + struct circ_buf *rb, u32 rb_sz, + aspeed_udma_cb_t cb, void *id, bool dis_tmout) +{ + return aspeed_udma_request_chan(ch_no, addr, rb, rb_sz, cb, id, + dis_tmout, false); +} +EXPORT_SYMBOL(aspeed_udma_request_rx_chan); + +static void aspeed_udma_chan_ctrl(u32 ch_no, u32 op, bool is_tx) +{ + unsigned long flags; + u32 reg_en, reg_rst; + u32 reg_en_off = (is_tx) ? UDMA_TX_DMA_EN : UDMA_RX_DMA_EN; + u32 reg_rst_off = (is_tx) ? UDMA_TX_DMA_RST : UDMA_TX_DMA_RST; + + if (ch_no > UDMA_MAX_CHANNEL) + return; + + spin_lock_irqsave(&udma->lock, flags); + + reg_en = readl(udma->regs + reg_en_off); + reg_rst = readl(udma->regs + reg_rst_off); + + switch (op) { + case ASPEED_UDMA_OP_ENABLE: + reg_en |= (0x1 << ch_no); + writel(reg_en, udma->regs + reg_en_off); + break; + case ASPEED_UDMA_OP_DISABLE: + reg_en &= ~(0x1 << ch_no); + writel(reg_en, udma->regs + reg_en_off); + break; + case ASPEED_UDMA_OP_RESET: + reg_en &= ~(0x1 << ch_no); + writel(reg_en, udma->regs + reg_en_off); + + reg_rst |= (0x1 << ch_no); + writel(reg_rst, udma->regs + reg_rst_off); + + udelay(100); + + reg_rst &= ~(0x1 << ch_no); + writel(reg_rst, udma->regs + reg_rst_off); + break; + default: + break; + } + + spin_unlock_irqrestore(&udma->lock, flags); +} + +void aspeed_udma_tx_chan_ctrl(u32 ch_no, enum aspeed_udma_ops op) +{ + aspeed_udma_chan_ctrl(ch_no, op, true); +} +EXPORT_SYMBOL(aspeed_udma_tx_chan_ctrl); + +void aspeed_udma_rx_chan_ctrl(u32 ch_no, enum aspeed_udma_ops op) +{ + aspeed_udma_chan_ctrl(ch_no, op, false); +} +EXPORT_SYMBOL(aspeed_udma_rx_chan_ctrl); + +static irqreturn_t aspeed_udma_isr(int irq, void *arg) +{ + u32 bit; + unsigned long tx_stat = readl(udma->regs + UDMA_TX_DMA_INT_STAT); + unsigned long rx_stat = readl(udma->regs + UDMA_RX_DMA_INT_STAT); + + if (udma != (struct aspeed_udma *)arg) + return IRQ_NONE; + + if (tx_stat == 0 && rx_stat == 0) + return IRQ_NONE; + + for_each_set_bit(bit, &tx_stat, UDMA_MAX_CHANNEL) { + writel((0x1 << bit), udma->regs + UDMA_TX_DMA_INT_STAT); + if (udma->tx_chs[bit].cb) + udma->tx_chs[bit].cb(aspeed_udma_get_tx_rptr(bit), + udma->tx_chs[bit].cb_arg); + } + + for_each_set_bit(bit, &rx_stat, UDMA_MAX_CHANNEL) { + writel((0x1 << bit), udma->regs + UDMA_RX_DMA_INT_STAT); + if (udma->rx_chs[bit].cb) + udma->rx_chs[bit].cb(aspeed_udma_get_rx_wptr(bit), + udma->rx_chs[bit].cb_arg); + } + + return IRQ_HANDLED; +} + +static int aspeed_udma_probe(struct platform_device *pdev) +{ + int i, rc; + struct resource *res; + struct device *dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (IS_ERR_OR_NULL(res)) { + dev_err(dev, "failed to get register base\n"); + return -ENODEV; + } + + udma->regs = devm_ioremap_resource(dev, res); + if (IS_ERR_OR_NULL(udma->regs)) { + dev_err(dev, "failed to map registers\n"); + return PTR_ERR(udma->regs); + } + + /* disable for safety */ + writel(0x0, udma->regs + UDMA_TX_DMA_EN); + writel(0x0, udma->regs + UDMA_RX_DMA_EN); + + udma->irq = platform_get_irq(pdev, 0); + if (udma->irq < 0) { + dev_err(dev, "failed to get IRQ number\n"); + return -ENODEV; + } + + rc = devm_request_irq(dev, udma->irq, aspeed_udma_isr, + IRQF_SHARED, DEVICE_NAME, udma); + if (rc) { + dev_err(dev, "failed to request IRQ handler\n"); + return rc; + } + + for (i = 0; i < UDMA_MAX_CHANNEL; ++i) { + writel(0, udma->regs + UDMA_CHX_TX_WR_PTR(i)); + writel(0, udma->regs + UDMA_CHX_RX_RD_PTR(i)); + } + + writel(0xffffffff, udma->regs + UDMA_TX_DMA_RST); + writel(0x0, udma->regs + UDMA_TX_DMA_RST); + + writel(0xffffffff, udma->regs + UDMA_RX_DMA_RST); + writel(0x0, udma->regs + UDMA_RX_DMA_RST); + + writel(0x0, udma->regs + UDMA_TX_DMA_INT_EN); + writel(0xffffffff, udma->regs + UDMA_TX_DMA_INT_STAT); + writel(0x0, udma->regs + UDMA_RX_DMA_INT_EN); + writel(0xffffffff, udma->regs + UDMA_RX_DMA_INT_STAT); + + writel(UDMA_TIMEOUT, udma->regs + UDMA_TIMEOUT_TIMER); + + spin_lock_init(&udma->lock); + + dev_set_drvdata(dev, udma); + + return 0; +} + +static const struct of_device_id aspeed_udma_match[] = { + { .compatible = "aspeed,ast2600-udma" }, + { }, +}; + +static struct platform_driver aspeed_udma_driver = { + .driver = { + .name = DEVICE_NAME, + .of_match_table = aspeed_udma_match, + + }, + .probe = aspeed_udma_probe, +}; + +module_platform_driver(aspeed_udma_driver); + +MODULE_AUTHOR("Chia-Wei Wang "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Aspeed UDMA Engine Driver"); diff --git a/include/linux/soc/aspeed/aspeed-udma.h b/include/linux/soc/aspeed/aspeed-udma.h new file mode 100644 index 000000000000..4ec95d726ede --- /dev/null +++ b/include/linux/soc/aspeed/aspeed-udma.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) Aspeed Technology Inc. + */ +#ifndef __ASPEED_UDMA_H__ +#define __ASPEED_UDMA_H__ + +#include + +typedef void (*aspeed_udma_cb_t)(int rb_rwptr, void *id); + +enum aspeed_udma_ops { + ASPEED_UDMA_OP_ENABLE, + ASPEED_UDMA_OP_DISABLE, + ASPEED_UDMA_OP_RESET, +}; + +void aspeed_udma_set_tx_wptr(u32 ch_no, u32 wptr); +void aspeed_udma_set_rx_rptr(u32 ch_no, u32 rptr); + +void aspeed_udma_tx_chan_ctrl(u32 ch_no, enum aspeed_udma_ops op); +void aspeed_udma_rx_chan_ctrl(u32 ch_no, enum aspeed_udma_ops op); + +int aspeed_udma_request_tx_chan(u32 ch_no, dma_addr_t addr, + struct circ_buf *rb, u32 rb_sz, + aspeed_udma_cb_t cb, void *id, bool en_tmout); +int aspeed_udma_request_rx_chan(u32 ch_no, dma_addr_t addr, + struct circ_buf *rb, u32 rb_sz, + aspeed_udma_cb_t cb, void *id, bool en_tmout); + +int aspeed_udma_free_tx_chan(u32 ch_no); +int aspeed_udma_free_rx_chan(u32 ch_no); + +#endif