Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750970AbdGFOWc (ORCPT ); Thu, 6 Jul 2017 10:22:32 -0400 Received: from mail-lf0-f45.google.com ([209.85.215.45]:35275 "EHLO mail-lf0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750896AbdGFOWa (ORCPT ); Thu, 6 Jul 2017 10:22:30 -0400 MIME-Version: 1.0 In-Reply-To: <1499335270-6512-3-git-send-email-p.pisati@gmail.com> References: <1499335270-6512-1-git-send-email-p.pisati@gmail.com> <1499335270-6512-3-git-send-email-p.pisati@gmail.com> From: Moritz Fischer Date: Thu, 6 Jul 2017 07:22:27 -0700 Message-ID: Subject: Re: [PATCH 2/2] fpga: lattice machxo2: Add Lattice MachXO2 support To: Paolo Pisati Cc: Alan Tull , Rob Herring , Mark Rutland , linux-fpga@vger.kernel.org, Devicetree List , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v66EMbaM006781 Content-Length: 11364 Lines: 362 Hi Paolo, On Thu, Jul 6, 2017 at 3:01 AM, Paolo Pisati wrote: > This patch adds support to the FPGA manager for programming > MachXO2 device’s internal flash memory, via slave SPI. > > Signed-off-by: Paolo Pisati > --- > drivers/fpga/Kconfig | 7 ++ > drivers/fpga/Makefile | 1 + > drivers/fpga/machxo2-spi.c | 298 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 306 insertions(+) > create mode 100644 drivers/fpga/machxo2-spi.c > > diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig > index 161ba9d..addda68 100644 > --- a/drivers/fpga/Kconfig > +++ b/drivers/fpga/Kconfig > @@ -26,6 +26,13 @@ config FPGA_MGR_ICE40_SPI > help > FPGA manager driver support for Lattice iCE40 FPGAs over SPI. > > +config FPGA_MGR_MACHXO2_SPI > + tristate "Lattice MachXO2 SPI" > + depends on SPI > + help > + FPGA manager driver support for Lattice MachXO2 configuration > + over slave SPI interface. > + > config FPGA_MGR_SOCFPGA > tristate "Altera SOCFPGA FPGA Manager" > depends on ARCH_SOCFPGA || COMPILE_TEST > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile > index 2a4f021..cc10e9d 100644 > --- a/drivers/fpga/Makefile > +++ b/drivers/fpga/Makefile > @@ -7,6 +7,7 @@ obj-$(CONFIG_FPGA) += fpga-mgr.o > > # FPGA Manager Drivers > obj-$(CONFIG_FPGA_MGR_ICE40_SPI) += ice40-spi.o > +obj-$(CONFIG_FPGA_MGR_MACHXO2_SPI) += machxo2-spi.o > obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o > obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o > obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o > diff --git a/drivers/fpga/machxo2-spi.c b/drivers/fpga/machxo2-spi.c > new file mode 100644 > index 0000000..69e02a6 > --- /dev/null > +++ b/drivers/fpga/machxo2-spi.c > @@ -0,0 +1,298 @@ > +/** > + * Lattice MachXO2 Slave SPI Driver > + * > + * Copyright (C) 2017 Paolo Pisati > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * Manage Lattice FPGA firmware that is loaded over SPI using > + * the slave serial configuration interface. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +/* MachXO2 Programming Guide - sysCONFIG Programming Commands */ > + > +#define ISC_DISABLE 0x00000026 > +#define ISC_ENABLE 0x000008c6 > +#define ISC_ERASE 0x0000040e > +#define ISC_NOOP 0xffffffff > +#define ISC_PROGRAMDONE 0x0000005e > +#define LSC_CHECKBUSY 0x000000f0 > +#define LSC_INITADDRESS 0x00000046 > +#define LSC_PROGINCRNV 0x01000070 > +#define LSC_REFRESH 0x00000079 > + > +#define BUSYFLAG BIT(7) > + > +/* > + * Max CCLK in Slave SPI mode according to 'MachXO2 Family Data > + * Sheet' sysCONFIG Port Timing Specifications (3-36) > + */ > +#define MACHXO2_MAX_SPEED 66000000 > + > +#define MACHXO2_LOW_DELAY 5 /* us */ > +#define MACHXO2_HIGH_DELAY 200 /* us */ > +#define MACHXO2_REFRESH 4800 /* us */ > + > +#define MACHXO2_OP_SIZE sizeof(u32) > +#define MACHXO2_PAGE_SIZE 16 > + > +static int wait_until_not_busy(struct spi_device *spi) > +{ > + struct spi_message msg; > + struct spi_transfer rx, tx; > + u32 checkbusy = LSC_CHECKBUSY; Won't you potentially run into endianness issues here? > + u8 busy; > + int ret; > + > + do { > + memset(&rx, 0, sizeof(rx)); > + memset(&tx, 0, sizeof(tx)); > + tx.tx_buf = &checkbusy; > + tx.len = MACHXO2_OP_SIZE; > + rx.rx_buf = &busy; > + rx.len = sizeof(busy); > + spi_message_init(&msg); > + spi_message_add_tail(&tx, &msg); > + spi_message_add_tail(&rx, &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + return ret; > + } while (busy & BUSYFLAG); > + > + return 0; > +} > + > +static enum fpga_mgr_states machxo2_spi_state(struct fpga_manager *mgr) > +{ > + return FPGA_MGR_STATE_UNKNOWN; > +} > + > +static int machxo2_write_init(struct fpga_manager *mgr, > + struct fpga_image_info *info, > + const char *buf, size_t count) > +{ > + struct spi_device *spi = mgr->priv; > + struct spi_message msg; > + struct spi_transfer tx[5]; > + u32 disable = ISC_DISABLE; > + u32 bypass = ISC_NOOP; > + u32 enable = ISC_ENABLE; > + u32 erase = ISC_ERASE; > + u32 initaddr = LSC_INITADDRESS; Same here? > + int ret; > + > + if ((info->flags & FPGA_MGR_PARTIAL_RECONFIG)) { > + dev_err(&mgr->dev, > + "Partial reconfiguration is not supported\n"); > + return -ENOTSUPP; > + } > + > + memset(tx, 0, sizeof(tx)); > + spi_message_init(&msg); > + tx[0].tx_buf = &disable; > + tx[0].len = MACHXO2_OP_SIZE - 1; > + spi_message_add_tail(&tx[0], &msg); > + > + tx[1].tx_buf = &bypass; > + tx[1].len = MACHXO2_OP_SIZE; > + spi_message_add_tail(&tx[1], &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + goto fail; > + > + ret = wait_until_not_busy(spi); > + if (ret) > + goto fail; > + > + spi_message_init(&msg); > + tx[2].tx_buf = &enable; > + tx[2].len = MACHXO2_OP_SIZE; > + tx[2].delay_usecs = MACHXO2_LOW_DELAY; > + spi_message_add_tail(&tx[2], &msg); > + > + tx[3].tx_buf = &erase; > + tx[3].len = MACHXO2_OP_SIZE; > + spi_message_add_tail(&tx[3], &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + goto fail; > + > + ret = wait_until_not_busy(spi); > + if (ret) > + goto fail; > + > + spi_message_init(&msg); > + tx[4].tx_buf = &initaddr; > + tx[4].len = MACHXO2_OP_SIZE; > + spi_message_add_tail(&tx[4], &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + goto fail; > + > + return 0; > + > +fail: > + dev_err(&mgr->dev, "Error during FPGA init.\n"); > + return ret; > +} > + > +static int machxo2_write(struct fpga_manager *mgr, const char *buf, > + size_t count) > +{ > + struct spi_device *spi = mgr->priv; > + struct spi_message msg; > + struct spi_transfer *tx; > + u32 progincr = LSC_PROGINCRNV; > + u8 *payload, *ptr; > + int i, num, ret; > + > + if (count % MACHXO2_PAGE_SIZE != 0) { > + dev_err(&mgr->dev, "Malformed payload.\n"); > + ret = -EINVAL; > + goto out; > + } > + > + num = count / MACHXO2_PAGE_SIZE; > + payload = kzalloc(count + (num * MACHXO2_OP_SIZE), GFP_KERNEL); > + if (!payload) { > + dev_err(&mgr->dev, "Failed to allocate payload buffer\n"); > + ret = -ENOMEM; > + goto out; > + } > + tx = kcalloc(num, sizeof(*tx), GFP_KERNEL); > + if (!tx) { > + dev_err(&mgr->dev, "Failed to allocate spi_transfer list\n"); > + ret = -ENOMEM; > + goto fail; > + } > + memset(tx, 0, num * sizeof(*tx)); > + > + spi_message_init(&msg); > + ptr = payload; > + for (i = 0; i < num; i++) { > + tx[i].tx_buf = ptr; > + tx[i].len = MACHXO2_OP_SIZE + MACHXO2_PAGE_SIZE; > + tx[i].delay_usecs = MACHXO2_HIGH_DELAY; > + memcpy(ptr, &progincr, MACHXO2_OP_SIZE); And here. > + ptr += MACHXO2_OP_SIZE; > + memcpy(ptr, buf, MACHXO2_PAGE_SIZE); > + buf += MACHXO2_PAGE_SIZE; > + ptr += MACHXO2_PAGE_SIZE; > + spi_message_add_tail(&tx[i], &msg); > + } > + > + ret = spi_sync(spi, &msg); > + if (ret) > + dev_err(&mgr->dev, "Error loading the bitstream.\n"); > + > + kfree(tx); > +fail: > + kfree(payload); > +out: > + return ret; > +} > + > +static int machxo2_write_complete(struct fpga_manager *mgr, > + struct fpga_image_info *info) > +{ > + struct spi_device *spi = mgr->priv; > + struct spi_message msg; > + struct spi_transfer tx[2]; > + u32 progdone = ISC_PROGRAMDONE; > + u32 refresh = LSC_REFRESH; Here > + int ret; > + > + memset(tx, 0, sizeof(tx)); > + spi_message_init(&msg); > + tx[0].tx_buf = &progdone; > + tx[0].len = MACHXO2_OP_SIZE; > + spi_message_add_tail(&tx[0], &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + goto fail; > + > + ret = wait_until_not_busy(spi); > + if (ret) > + goto fail; > + > + spi_message_init(&msg); > + tx[1].tx_buf = &refresh; > + tx[1].len = MACHXO2_OP_SIZE - 1; > + tx[1].delay_usecs = MACHXO2_REFRESH; > + spi_message_add_tail(&tx[1], &msg); > + ret = spi_sync(spi, &msg); > + if (ret) > + goto fail; > + > + return 0; > + > +fail: > + dev_err(&mgr->dev, "Refresh failed.\n"); > + return ret; > +} > + > +static const struct fpga_manager_ops machxo2_ops = { > + .state = machxo2_spi_state, > + .write_init = machxo2_write_init, > + .write = machxo2_write, > + .write_complete = machxo2_write_complete, > +}; > + > +static int machxo2_spi_probe(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + > + if (spi->max_speed_hz > MACHXO2_MAX_SPEED) { > + dev_err(dev, "Speed is too high\n"); > + return -EINVAL; > + } > + > + return fpga_mgr_register(dev, "Lattice MachXO2 SPI FPGA Manager", > + &machxo2_ops, spi); > +} > + > +static int machxo2_spi_remove(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + > + fpga_mgr_unregister(dev); > + > + return 0; > +} > + > +static const struct of_device_id of_match[] = { > + { .compatible = "lattice,machxo2-slave-spi", }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, of_match); > + > +static const struct spi_device_id lattice_ids[] = { > + { "machxo2-slave-spi", 0 }, > + { }, > +}; > +MODULE_DEVICE_TABLE(spi, lattice_ids); > + > +static struct spi_driver machxo2_spi_driver = { > + .driver = { > + .name = "machxo2-slave-spi", > + .of_match_table = of_match_ptr(of_match), > + }, > + .probe = machxo2_spi_probe, > + .remove = machxo2_spi_remove, > + .id_table = lattice_ids, > +}; > + > +module_spi_driver(machxo2_spi_driver) > + > +MODULE_AUTHOR("Paolo Pisati "); > +MODULE_DESCRIPTION("Load Lattice FPGA firmware over SPI"); > +MODULE_LICENSE("GPL v2"); > -- > 2.7.4 > Cheers, Moritz