From patchwork Fri Mar 29 19:48:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Witold Sadowski X-Patchwork-Id: 784721 Received: from mx0b-0016f401.pphosted.com (mx0b-0016f401.pphosted.com [67.231.156.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89EF313BC03; Fri, 29 Mar 2024 19:49:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.156.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711741757; cv=none; b=cjtehenVixvmNeHrgJU0vG6Oh0acYHRImhZEpbxhl+DJUIswbyC9R+tt65BKBwmM5eMTUOr6h+I02crApKSPRyp/df8chw6YSPRDKOdXSYBP/hGKUM97HrHSQy/7uuodDjkWSvcgTzqbP031nPi1F0yV0/aYNjpvbs+p2yIskFk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711741757; c=relaxed/simple; bh=6OcVgjmbBH1TsNTeoHZG6CyiWyHGDstqZcpYmztn6FE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IxYHdG83bEtICEWDLADT50IV7dvoNpfnD2Xqbsc4ZaY9+u0i440rhK2N/C2jlkc6ANtRgtYtIDlOOL3bnkDxWrl1sjRY6xfPs/uUQzqUD1IDm07y7CcXwCJqAUDkv4oLzuo5jVjaMLQRXhp6py6SCxkLIZGjxOGza4IvFXzg16Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=marvell.com; spf=pass smtp.mailfrom=marvell.com; dkim=pass (2048-bit key) header.d=marvell.com header.i=@marvell.com header.b=BsaEc4id; arc=none smtp.client-ip=67.231.156.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=marvell.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=marvell.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=marvell.com header.i=@marvell.com header.b="BsaEc4id" Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 42TE0ThA014430; Fri, 29 Mar 2024 12:49:10 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= pfpt0220; bh=O3VwhaSMo1SbWKCSCLMX6Xq/pTDeQg1rQmmunEWwB0A=; b=Bsa Ec4idmY8+0kbBCKP2/R1VzZgBPAhIe0gmKSU3hAJ96fuM3E5qh8gd3fsf21SmNsF 1yUsBC9lrjyl2hisKXbBszMR52dNEMB9I1h/uQ8UGlGl7Y9qn8SfPNAwrfQacevC Kiu5FB1GaD8avwQrw7rUxkIKsJrZNQPpscO1rrqqKTE5S1RS3O2HKURj368UmmQh uLjfFhwDuZ/tdYWINOTuqVon/DrFec19fYLuhERg9o0/EZ5YFKjdGRGTl+lx1ao0 s1KJhJC9xv7diWIXegNR9QShpHYloiL6Si75RS16Zbu3V9jdIqRL+vmzG7SXUbSM U3gs1s21fJSvH3LDyAg== Received: from dc6wp-exch02.marvell.com ([4.21.29.225]) by mx0b-0016f401.pphosted.com (PPS) with ESMTPS id 3x5gm3krqe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 29 Mar 2024 12:49:10 -0700 (PDT) Received: from DC6WP-EXCH02.marvell.com (10.76.176.209) by DC6WP-EXCH02.marvell.com (10.76.176.209) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4; Fri, 29 Mar 2024 12:49:09 -0700 Received: from maili.marvell.com (10.69.176.80) by DC6WP-EXCH02.marvell.com (10.76.176.209) with Microsoft SMTP Server id 15.2.1544.4 via Frontend Transport; Fri, 29 Mar 2024 12:49:09 -0700 Received: from localhost.localdomain (unknown [10.110.150.170]) by maili.marvell.com (Postfix) with ESMTP id 403573F707A; Fri, 29 Mar 2024 12:49:09 -0700 (PDT) From: Witold Sadowski To: , , CC: , , , , , Witold Sadowski Subject: [PATCH 5/5] cadence-xspi: Add xfer capabilities Date: Fri, 29 Mar 2024 12:48:49 -0700 Message-ID: <20240329194849.25554-6-wsadowski@marvell.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240329194849.25554-1-wsadowski@marvell.com> References: <20240329194849.25554-1-wsadowski@marvell.com> Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: UCUA4KG5NQmrDiPPzCz6nPm-Is-msg-d X-Proofpoint-ORIG-GUID: UCUA4KG5NQmrDiPPzCz6nPm-Is-msg-d X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-29_13,2024-03-28_01,2023-05-22_02 Add support for iMRVL xfer hw_overlay of Cadence xSPI block. MRVL Xfer overlay extend xSPI capabilities, to support non-memory SPI operations. With generic xSPI command it allows to create any required SPI transaction Signed-off-by: Witold Sadowski --- drivers/spi/spi-cadence-xspi.c | 249 +++++++++++++++++++++++++++++++++ 1 file changed, 249 insertions(+) diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c index 01e81d40f04c..451f83d53898 100644 --- a/drivers/spi/spi-cadence-xspi.c +++ b/drivers/spi/spi-cadence-xspi.c @@ -219,19 +219,38 @@ #define CDNS_XSPI_DLL_RST_N BIT(24) #define CDNS_XSPI_DLL_LOCK BIT(0) +#define CDNS_XSPI_POLL_TIMEOUT_US 1000 +#define CDNS_XSPI_POLL_DELAY_US 10 + /* Marvell clock config register */ #define CDNS_MRVL_XSPI_CLK_CTRL_AUX_REG 0x2020 #define CDNS_MRVL_XSPI_CLK_ENABLE BIT(0) #define CDNS_MRVL_XSPI_CLK_DIV GENMASK(4, 1) + /* Marvell MSI-X clear interrupt register */ #define CDNS_MRVL_XSPI_SPIX_INTR_AUX 0x2000 #define CDNS_MRVL_MSIX_CLEAR_IRQ 0x01 +#define SPIX_XFER_FUNC_CTRL 0x210 +#define SPIX_XFER_FUNC_CTRL_READ_DATA(i) (0x000 + 8 * (i)) + /* Marvell clock macros */ #define CDNS_MRVL_XSPI_CLOCK_IO_HZ 800000000 #define CDNS_MRVL_XSPI_CLOCK_DIVIDED(div) ((CDNS_MRVL_XSPI_CLOCK_IO_HZ) / (div)) +/* Marvell XFER registers */ +#define XFER_SOFT_RESET BIT(11) +#define XFER_CS_N_HOLD GENMASK(9, 6) +#define XFER_RECEIVE_ENABLE BIT(4) +#define XFER_FUNC_ENABLE BIT(3) +#define XFER_CLK_CAPTURE_POL BIT(2) +#define XFER_CLK_DRIVE_POL BIT(1) +#define XFER_FUNC_START BIT(0) + +#define XFER_QWORD_COUNT 32 +#define XFER_QWORD_BYTECOUNT 8 + enum cdns_xspi_stig_instr_type { CDNS_XSPI_STIG_INSTR_TYPE_0, CDNS_XSPI_STIG_INSTR_TYPE_1, @@ -256,6 +275,7 @@ struct cdns_xspi_dev { void __iomem *iobase; void __iomem *auxbase; void __iomem *sdmabase; + void __iomem *xferbase; int irq; int cur_cs; @@ -270,6 +290,9 @@ struct cdns_xspi_dev { const void *out_buffer; u8 hw_num_banks; + + bool xfer_in_progress; + int current_xfer_qword; }; #define MRVL_DEFAULT_CLK 25000000 @@ -884,6 +907,221 @@ static bool cdns_xspi_get_hw_overlay(struct platform_device *pdev) return (err >= 0); } + +static int cdns_xspi_prepare_generic(int cs, const void *dout, int len, int glue, u32 *cmd_regs) +{ + u8 *data = (u8 *)dout; + int i; + int data_counter = 0; + + memset(cmd_regs, 0x00, 6*4); + + if (len > 7) { + for (i = (len >= 10 ? 2 : len - 8); i >= 0 ; i--) + cmd_regs[3] |= data[data_counter++] << (8*i); + } + if (len > 3) { + for (i = (len >= 7 ? 3 : len - 4); i >= 0; i--) + cmd_regs[2] |= data[data_counter++] << (8*i); + } + for (i = (len >= 3 ? 2 : len - 1); i >= 0 ; i--) + cmd_regs[1] |= data[data_counter++] << (8 + 8*i); + + cmd_regs[1] |= 96; + cmd_regs[3] |= len << 24; + cmd_regs[4] |= cs << 12; + + if (glue == 1) + cmd_regs[4] |= 1 << 28; + + return 0; +} + +unsigned char reverse_bits(unsigned char num) +{ + unsigned int count = sizeof(num) * 8 - 1; + unsigned int reverse_num = num; + + num >>= 1; + while (num) { + reverse_num <<= 1; + reverse_num |= num & 1; + num >>= 1; + count--; + } + reverse_num <<= count; + return reverse_num; +} + +static void cdns_xspi_read_single_qword(struct cdns_xspi_dev *cdns_xspi, u8 **buffer) +{ + u64 d = readq(cdns_xspi->xferbase + + SPIX_XFER_FUNC_CTRL_READ_DATA(cdns_xspi->current_xfer_qword)); + u8 *ptr = (u8 *)&d; + int k; + + for (k = 0; k < 8; k++) { + u8 val = reverse_bits((ptr[k])); + **buffer = val; + *buffer = *buffer + 1; + } + + cdns_xspi->current_xfer_qword++; + cdns_xspi->current_xfer_qword %= XFER_QWORD_COUNT; +} + +static void cdns_xspi_finish_read(struct cdns_xspi_dev *cdns_xspi, u8 **buffer, u32 data_count) +{ + u64 d = readq(cdns_xspi->xferbase + + SPIX_XFER_FUNC_CTRL_READ_DATA(cdns_xspi->current_xfer_qword)); + u8 *ptr = (u8 *)&d; + int k; + + for (k = 0; k < data_count % XFER_QWORD_BYTECOUNT; k++) { + u8 val = reverse_bits((ptr[k])); + **buffer = val; + *buffer = *buffer + 1; + } + + cdns_xspi->current_xfer_qword++; + cdns_xspi->current_xfer_qword %= XFER_QWORD_COUNT; +} + +static int cdns_xspi_prepare_transfer(int cs, int dir, int len, u32 *cmd_regs) +{ + memset(cmd_regs, 0x00, 6*4); + + cmd_regs[1] |= 127; + cmd_regs[2] |= len << 16; + cmd_regs[4] |= dir << 4; //dir = 0 read, dir =1 write + cmd_regs[4] |= cs << 12; + + return 0; +} + +bool cdns_xspi_stig_ready(struct cdns_xspi_dev *cdns_xspi, bool sleep) +{ + u32 ctrl_stat; + + return readl_relaxed_poll_timeout + (cdns_xspi->iobase + CDNS_XSPI_CTRL_STATUS_REG, + ctrl_stat, + ((ctrl_stat & BIT(3)) == 0), + sleep ? CDNS_XSPI_POLL_DELAY_US : 0, + sleep ? CDNS_XSPI_POLL_TIMEOUT_US : 0); +} + +bool cdns_xspi_sdma_ready(struct cdns_xspi_dev *cdns_xspi, bool sleep) +{ + u32 ctrl_stat; + + return readl_relaxed_poll_timeout + (cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG, + ctrl_stat, + (ctrl_stat & CDNS_XSPI_SDMA_TRIGGER), + sleep ? CDNS_XSPI_POLL_DELAY_US : 0, + sleep ? CDNS_XSPI_POLL_TIMEOUT_US : 0); +} + +int cdns_xspi_transfer_one_message_b0(struct spi_controller *master, + struct spi_message *m) +{ + struct cdns_xspi_dev *cdns_xspi = spi_master_get_devdata(master); + struct spi_device *spi = m->spi; + struct spi_transfer *t = NULL; + + const int max_len = XFER_QWORD_BYTECOUNT * XFER_QWORD_COUNT; + int current_cycle_count; + int cs = spi->chip_select; + int cs_change = 0; + + /* Enable xfer state machine */ + if (!cdns_xspi->xfer_in_progress) { + u32 xfer_control = readl(cdns_xspi->xferbase + SPIX_XFER_FUNC_CTRL); + + cdns_xspi->current_xfer_qword = 0; + cdns_xspi->xfer_in_progress = true; + xfer_control |= (XFER_RECEIVE_ENABLE | + XFER_CLK_CAPTURE_POL | + XFER_FUNC_START | + XFER_SOFT_RESET | + FIELD_PREP(XFER_CS_N_HOLD, (1 << cs))); + xfer_control &= ~(XFER_FUNC_ENABLE | XFER_CLK_DRIVE_POL); + writel(xfer_control, cdns_xspi->xferbase + SPIX_XFER_FUNC_CTRL); + } + + list_for_each_entry(t, &m->transfers, transfer_list) { + u8 *txd = (u8 *) t->tx_buf; + u8 *rxd = (u8 *) t->rx_buf; + u8 data[10]; + u32 cmd_regs[6]; + + if (!txd) + txd = data; + + cdns_xspi->in_buffer = txd + 1; + cdns_xspi->out_buffer = txd + 1; + + while (t->len) { + + current_cycle_count = t->len > max_len ? max_len : t->len; + + if (current_cycle_count < 10) { + cdns_xspi_prepare_generic(cs, txd, current_cycle_count, + false, cmd_regs); + cdns_xspi_trigger_command(cdns_xspi, cmd_regs); + if (cdns_xspi_stig_ready(cdns_xspi, true)) + return -EIO; + } else { + cdns_xspi_prepare_generic(cs, txd, 1, true, cmd_regs); + cdns_xspi_trigger_command(cdns_xspi, cmd_regs); + cdns_xspi_prepare_transfer(cs, 1, current_cycle_count - 1, + cmd_regs); + cdns_xspi_trigger_command(cdns_xspi, cmd_regs); + if (cdns_xspi_sdma_ready(cdns_xspi, true)) + return -EIO; + cdns_xspi_sdma_handle(cdns_xspi); + if (cdns_xspi_stig_ready(cdns_xspi, true)) + return -EIO; + + cdns_xspi->in_buffer += current_cycle_count; + cdns_xspi->out_buffer += current_cycle_count; + } + + if (rxd) { + int j; + + for (j = 0; j < current_cycle_count / 8; j++) + cdns_xspi_read_single_qword(cdns_xspi, &rxd); + cdns_xspi_finish_read(cdns_xspi, &rxd, current_cycle_count); + } else { + cdns_xspi->current_xfer_qword += current_cycle_count / + XFER_QWORD_BYTECOUNT; + if (current_cycle_count % XFER_QWORD_BYTECOUNT) + cdns_xspi->current_xfer_qword++; + + cdns_xspi->current_xfer_qword %= XFER_QWORD_COUNT; + } + cs_change = t->cs_change; + t->len -= current_cycle_count; + } + } + + if (!cs_change) { + u32 xfer_control = readl(cdns_xspi->xferbase + SPIX_XFER_FUNC_CTRL); + + xfer_control &= ~(XFER_RECEIVE_ENABLE | + XFER_SOFT_RESET); + writel(xfer_control, cdns_xspi->xferbase + SPIX_XFER_FUNC_CTRL); + cdns_xspi->xfer_in_progress = false; + } + + m->status = 0; + spi_finalize_current_message(master); + + return 0; +} + static int cdns_xspi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -948,6 +1186,16 @@ static int cdns_xspi_probe(struct platform_device *pdev) return PTR_ERR(cdns_xspi->auxbase); } + if (hw_overlay) { + res = platform_get_resource(pdev, IORESOURCE_MEM, 3); + cdns_xspi->xferbase = devm_ioremap_resource(dev, res); + if (IS_ERR(cdns_xspi->xferbase)) { + dev_info(dev, "XFER register base not found, set it\n"); + // For compatibility with older firmware + cdns_xspi->xferbase = cdns_xspi->iobase + 0x8000; + } + } + cdns_xspi->irq = platform_get_irq(pdev, 0); if (cdns_xspi->irq < 0) return -ENXIO; @@ -962,6 +1210,7 @@ static int cdns_xspi_probe(struct platform_device *pdev) if (hw_overlay) { cdns_mrvl_xspi_setup_clock(cdns_xspi, MRVL_DEFAULT_CLK); cdns_xspi_configure_phy(cdns_xspi); + host->transfer_one_message = cdns_xspi_transfer_one_message_b0; } cdns_xspi_print_phy_config(cdns_xspi);