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137 lines
3.5 KiB
137 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Technologic Systems TS-73xx SBC FPGA loader |
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* |
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* Copyright (C) 2016 Florian Fainelli <[email protected]> |
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* |
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* FPGA Manager Driver for the on-board Altera Cyclone II FPGA found on |
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* TS-7300, heavily based on load_fpga.c in their vendor tree. |
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*/ |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/string.h> |
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#include <linux/iopoll.h> |
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#include <linux/fpga/fpga-mgr.h> |
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#define TS73XX_FPGA_DATA_REG 0 |
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#define TS73XX_FPGA_CONFIG_REG 1 |
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#define TS73XX_FPGA_WRITE_DONE 0x1 |
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#define TS73XX_FPGA_WRITE_DONE_TIMEOUT 1000 /* us */ |
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#define TS73XX_FPGA_RESET 0x2 |
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#define TS73XX_FPGA_RESET_LOW_DELAY 30 /* us */ |
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#define TS73XX_FPGA_RESET_HIGH_DELAY 80 /* us */ |
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#define TS73XX_FPGA_LOAD_OK 0x4 |
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#define TS73XX_FPGA_CONFIG_LOAD 0x8 |
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struct ts73xx_fpga_priv { |
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void __iomem *io_base; |
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struct device *dev; |
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}; |
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static int ts73xx_fpga_write_init(struct fpga_manager *mgr, |
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struct fpga_image_info *info, |
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const char *buf, size_t count) |
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{ |
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struct ts73xx_fpga_priv *priv = mgr->priv; |
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/* Reset the FPGA */ |
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writeb(0, priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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udelay(TS73XX_FPGA_RESET_LOW_DELAY); |
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writeb(TS73XX_FPGA_RESET, priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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udelay(TS73XX_FPGA_RESET_HIGH_DELAY); |
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return 0; |
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} |
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static int ts73xx_fpga_write(struct fpga_manager *mgr, const char *buf, |
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size_t count) |
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{ |
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struct ts73xx_fpga_priv *priv = mgr->priv; |
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size_t i = 0; |
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int ret; |
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u8 reg; |
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while (count--) { |
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ret = readb_poll_timeout(priv->io_base + TS73XX_FPGA_CONFIG_REG, |
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reg, !(reg & TS73XX_FPGA_WRITE_DONE), |
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1, TS73XX_FPGA_WRITE_DONE_TIMEOUT); |
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if (ret < 0) |
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return ret; |
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writeb(buf[i], priv->io_base + TS73XX_FPGA_DATA_REG); |
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i++; |
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} |
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return 0; |
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} |
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static int ts73xx_fpga_write_complete(struct fpga_manager *mgr, |
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struct fpga_image_info *info) |
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{ |
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struct ts73xx_fpga_priv *priv = mgr->priv; |
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u8 reg; |
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usleep_range(1000, 2000); |
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reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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reg |= TS73XX_FPGA_CONFIG_LOAD; |
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writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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usleep_range(1000, 2000); |
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reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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reg &= ~TS73XX_FPGA_CONFIG_LOAD; |
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writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG); |
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if ((reg & TS73XX_FPGA_LOAD_OK) != TS73XX_FPGA_LOAD_OK) |
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return -ETIMEDOUT; |
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return 0; |
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} |
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static const struct fpga_manager_ops ts73xx_fpga_ops = { |
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.write_init = ts73xx_fpga_write_init, |
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.write = ts73xx_fpga_write, |
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.write_complete = ts73xx_fpga_write_complete, |
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}; |
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static int ts73xx_fpga_probe(struct platform_device *pdev) |
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{ |
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struct device *kdev = &pdev->dev; |
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struct ts73xx_fpga_priv *priv; |
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struct fpga_manager *mgr; |
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struct resource *res; |
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priv = devm_kzalloc(kdev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->dev = kdev; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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priv->io_base = devm_ioremap_resource(kdev, res); |
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if (IS_ERR(priv->io_base)) |
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return PTR_ERR(priv->io_base); |
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mgr = devm_fpga_mgr_create(kdev, "TS-73xx FPGA Manager", |
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&ts73xx_fpga_ops, priv); |
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if (!mgr) |
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return -ENOMEM; |
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return devm_fpga_mgr_register(kdev, mgr); |
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} |
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static struct platform_driver ts73xx_fpga_driver = { |
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.driver = { |
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.name = "ts73xx-fpga-mgr", |
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}, |
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.probe = ts73xx_fpga_probe, |
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}; |
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module_platform_driver(ts73xx_fpga_driver); |
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MODULE_AUTHOR("Florian Fainelli <[email protected]>"); |
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MODULE_DESCRIPTION("TS-73xx FPGA Manager driver"); |
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MODULE_LICENSE("GPL v2");
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