/* * Freescale iMX PATA driver * * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org> * * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * TODO: * - dmaengine support * - check if timing stuff needed */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/blkdev.h> #include <scsi/scsi_host.h> #include <linux/ata.h> #include <linux/libata.h> #include <linux/platform_device.h> #include <linux/clk.h> #define DRV_NAME "pata_imx" #define PATA_IMX_ATA_CONTROL 0x24 #define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7) #define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6) #define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0) #define PATA_IMX_ATA_INT_EN 0x2C #define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3) #define PATA_IMX_DRIVE_DATA 0xA0 #define PATA_IMX_DRIVE_CONTROL 0xD8 struct pata_imx_priv { struct clk *clk; /* timings/interrupt/control regs */ u8 *host_regs; u32 ata_ctl; }; static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused) { struct ata_device *dev; struct ata_port *ap = link->ap; struct pata_imx_priv *priv = ap->host->private_data; u32 val; ata_for_each_dev(dev, link, ENABLED) { dev->pio_mode = dev->xfer_mode = XFER_PIO_0; dev->xfer_shift = ATA_SHIFT_PIO; dev->flags |= ATA_DFLAG_PIO; val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL); if (ata_pio_need_iordy(dev)) val |= PATA_IMX_ATA_CTRL_IORDY_EN; else val &= ~PATA_IMX_ATA_CTRL_IORDY_EN; __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL); ata_dev_info(dev, "configured for PIO\n"); } return 0; } static struct scsi_host_template pata_imx_sht = { ATA_PIO_SHT(DRV_NAME), }; static struct ata_port_operations pata_imx_port_ops = { .inherits = &ata_sff_port_ops, .sff_data_xfer = ata_sff_data_xfer_noirq, .cable_detect = ata_cable_unknown, .set_mode = pata_imx_set_mode, }; static void pata_imx_setup_port(struct ata_ioports *ioaddr) { /* Fixup the port shift for platforms that need it */ ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2); ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2); ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2); ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2); ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2); ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2); ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2); ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2); ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2); ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2); } static int pata_imx_probe(struct platform_device *pdev) { struct ata_host *host; struct ata_port *ap; struct pata_imx_priv *priv; int irq = 0; struct resource *io_res; io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (io_res == NULL) return -EINVAL; irq = platform_get_irq(pdev, 0); if (irq <= 0) return -EINVAL; priv = devm_kzalloc(&pdev->dev, sizeof(struct pata_imx_priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(priv->clk)) { dev_err(&pdev->dev, "Failed to get clock\n"); return PTR_ERR(priv->clk); } clk_prepare_enable(priv->clk); host = ata_host_alloc(&pdev->dev, 1); if (!host) goto free_priv; host->private_data = priv; ap = host->ports[0]; ap->ops = &pata_imx_port_ops; ap->pio_mask = ATA_PIO0; ap->flags |= ATA_FLAG_SLAVE_POSS; priv->host_regs = devm_ioremap(&pdev->dev, io_res->start, resource_size(io_res)); if (!priv->host_regs) { dev_err(&pdev->dev, "failed to map IO/CTL base\n"); goto free_priv; } ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA; ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL; ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; pata_imx_setup_port(&ap->ioaddr); ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx", (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA, (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL); /* deassert resets */ __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B | PATA_IMX_ATA_CTRL_ATA_RST_B, priv->host_regs + PATA_IMX_ATA_CONTROL); /* enable interrupts */ __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2, priv->host_regs + PATA_IMX_ATA_INT_EN); /* activate */ return ata_host_activate(host, irq, ata_sff_interrupt, 0, &pata_imx_sht); free_priv: clk_disable_unprepare(priv->clk); clk_put(priv->clk); return -ENOMEM; } static int pata_imx_remove(struct platform_device *pdev) { struct ata_host *host = dev_get_drvdata(&pdev->dev); struct pata_imx_priv *priv = host->private_data; ata_host_detach(host); __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN); clk_disable_unprepare(priv->clk); clk_put(priv->clk); return 0; } #ifdef CONFIG_PM static int pata_imx_suspend(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); struct pata_imx_priv *priv = host->private_data; int ret; ret = ata_host_suspend(host, PMSG_SUSPEND); if (!ret) { __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN); priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL); clk_disable_unprepare(priv->clk); } return ret; } static int pata_imx_resume(struct device *dev) { struct ata_host *host = dev_get_drvdata(dev); struct pata_imx_priv *priv = host->private_data; clk_prepare_enable(priv->clk); __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL); __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2, priv->host_regs + PATA_IMX_ATA_INT_EN); ata_host_resume(host); return 0; } static const struct dev_pm_ops pata_imx_pm_ops = { .suspend = pata_imx_suspend, .resume = pata_imx_resume, }; #endif static struct platform_driver pata_imx_driver = { .probe = pata_imx_probe, .remove = pata_imx_remove, .driver = { .name = DRV_NAME, .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &pata_imx_pm_ops, #endif }, }; module_platform_driver(pata_imx_driver); MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>"); MODULE_DESCRIPTION("low-level driver for iMX PATA"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRV_NAME);