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Message-ID: <CAAtXAHfSBzLisqBgF4Vry0vrcL3+DB4b1ctMOrTdOq5ue4D7JQ@mail.gmail.com>
Date: Tue, 12 Jul 2016 14:31:05 -0700
From: Moritz Fischer <moritz.fischer@...us.com>
To: Alan Tull <atull@...nsource.altera.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Dinh Nguyen <dinguyen@...nsource.altera.com>,
Devicetree List <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Alan Tull <delicious.quinoa@...il.com>
Subject: Re: [PATCH 2/2] fpga-manager: Add Socfpga Arria10 support
Hi Alan,
couple of nits inline below.
On Tue, Jul 12, 2016 at 12:07 PM, Alan Tull <atull@...nsource.altera.com> wrote:
> +static int socfpga_a10_fpga_write_complete(struct fpga_manager *mgr, u32 flags)
> +{
> + struct a10_fpga_priv *priv = mgr->priv;
> + u32 reg;
> + int ret;
> +
> + /* Wait for pr_done */
> + ret = socfpga_a10_fpga_wait_for_pr_done(priv);
> +
> + /* Clear pr_request */
> + regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
> + A10_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST, 0);
> +
> + /* Send some clocks to clear out any errors */
> + socfpga_a10_fpga_generate_dclks(priv, 256);
> +
> + /* Disable s2f dclk and data */
> + regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_02_OFST,
> + A10_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL, 0);
Maybe replace 0 with named constant.
> +
> + /* Deassert chip select */
> + regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
> + A10_FPGAMGR_IMGCFG_CTL_01_S2F_NCE,
> + A10_FPGAMGR_IMGCFG_CTL_01_S2F_NCE);
> +
> + /* Disable data, dclk, nce, and pr_request override to CSS */
> + regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
> + A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG,
> + A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG);
> +
> + /* Return any errors regarding pr_done or pr_error */
> + if (ret)
> + return ret;
> +
> + /* Final check */
> + reg = socfpga_a10_fpga_read_stat(priv);
> +
> + if (((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_USERMODE) == 0) ||
> + ((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN) == 0) ||
> + ((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN) == 0)) {
> + dev_dbg(&mgr->dev,
> + "Timeout in final check. Status=%08xf\n", reg);
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
> +
> +static enum fpga_mgr_states socfpga_a10_fpga_state(struct fpga_manager *mgr)
> +{
> + struct a10_fpga_priv *priv = mgr->priv;
> + u32 reg = socfpga_a10_fpga_read_stat(priv);
> +
> + if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_USERMODE)
> + return FPGA_MGR_STATE_OPERATING;
> +
> + if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_READY)
> + return FPGA_MGR_STATE_WRITE;
> +
> + if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_CRC_ERROR)
> + return FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
> +
> + if ((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN) == 0)
> + return FPGA_MGR_STATE_RESET;
> +
> + return FPGA_MGR_STATE_UNKNOWN;
> +}
> +
> +static const struct fpga_manager_ops socfpga_a10_fpga_mgr_ops = {
> + .state = socfpga_a10_fpga_state,
> + .write_init = socfpga_a10_fpga_write_init,
> + .write = socfpga_a10_fpga_write,
> + .write_complete = socfpga_a10_fpga_write_complete,
> +};
> +
> +static int socfpga_a10_fpga_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct a10_fpga_priv *priv;
> + void __iomem *reg_base;
> + struct resource *res;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + /* First mmio base is for register access */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + reg_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(reg_base))
> + return PTR_ERR(reg_base);
> +
> + /* Second mmio base is for writing FPGA image data */
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + priv->fpga_data_addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(priv->fpga_data_addr))
> + return PTR_ERR(priv->fpga_data_addr);
> +
> + /* regmap for register access */
> + priv->regmap = devm_regmap_init_mmio(dev, reg_base,
> + &socfpga_a10_fpga_regmap_config);
> + if (IS_ERR(priv->regmap))
> + return -ENODEV;
> +
> + priv->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(priv->clk)) {
> + dev_err(dev, "no clock specified\n");
> + return PTR_ERR(priv->clk);
> + }
> +
> + ret = clk_prepare_enable(priv->clk);
> + if (ret) {
> + dev_err(dev, "could not enable clock\n");
> + clk_put(priv->clk);
Seen that you used devm_clk_get() is this one necessary?
> +static int socfpga_a10_fpga_remove(struct platform_device *pdev)
> +{
> + struct fpga_manager *mgr = platform_get_drvdata(pdev);
> + struct a10_fpga_priv *priv = mgr->priv;
> +
> + fpga_mgr_unregister(&pdev->dev);
> + clk_disable_unprepare(priv->clk);
> + clk_put(priv->clk);
Same here, if needed at all shouldn't it be devm_clk_put() ?
Cheers,
Moritz
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