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Linux/drivers/ata/pata_imx.c

  1 /*
  2  * Freescale iMX PATA driver
  3  *
  4  * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
  5  *
  6  * Based on pata_platform - Copyright (C) 2006 - 2007  Paul Mundt
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License.  See the file "COPYING" in the main directory of this archive
 10  * for more details.
 11  *
 12  * TODO:
 13  * - dmaengine support
 14  */
 15 
 16 #include <linux/ata.h>
 17 #include <linux/clk.h>
 18 #include <linux/libata.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_device.h>
 21 
 22 #define DRV_NAME "pata_imx"
 23 
 24 #define PATA_IMX_ATA_TIME_OFF           0x00
 25 #define PATA_IMX_ATA_TIME_ON            0x01
 26 #define PATA_IMX_ATA_TIME_1             0x02
 27 #define PATA_IMX_ATA_TIME_2W            0x03
 28 #define PATA_IMX_ATA_TIME_2R            0x04
 29 #define PATA_IMX_ATA_TIME_AX            0x05
 30 #define PATA_IMX_ATA_TIME_PIO_RDX       0x06
 31 #define PATA_IMX_ATA_TIME_4             0x07
 32 #define PATA_IMX_ATA_TIME_9             0x08
 33 
 34 #define PATA_IMX_ATA_CONTROL            0x24
 35 #define PATA_IMX_ATA_CTRL_FIFO_RST_B    (1<<7)
 36 #define PATA_IMX_ATA_CTRL_ATA_RST_B     (1<<6)
 37 #define PATA_IMX_ATA_CTRL_IORDY_EN      (1<<0)
 38 #define PATA_IMX_ATA_INT_EN             0x2C
 39 #define PATA_IMX_ATA_INTR_ATA_INTRQ2    (1<<3)
 40 #define PATA_IMX_DRIVE_DATA             0xA0
 41 #define PATA_IMX_DRIVE_CONTROL          0xD8
 42 
 43 static u32 pio_t4[] = { 30,  20,  15,  10,  10 };
 44 static u32 pio_t9[] = { 20,  15,  10,  10,  10 };
 45 static u32 pio_tA[] = { 35,  35,  35,  35,  35 };
 46 
 47 struct pata_imx_priv {
 48         struct clk *clk;
 49         /* timings/interrupt/control regs */
 50         void __iomem *host_regs;
 51         u32 ata_ctl;
 52 };
 53 
 54 static void pata_imx_set_timing(struct ata_device *adev,
 55                                 struct pata_imx_priv *priv)
 56 {
 57         struct ata_timing timing;
 58         unsigned long clkrate;
 59         u32 T, mode;
 60 
 61         clkrate = clk_get_rate(priv->clk);
 62 
 63         if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
 64             !clkrate)
 65                 return;
 66 
 67         T = 1000000000 / clkrate;
 68         ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);
 69 
 70         mode = adev->pio_mode - XFER_PIO_0;
 71 
 72         writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
 73         writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
 74         writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
 75         writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
 76         writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
 77         writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);
 78 
 79         writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
 80         writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
 81         writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
 82 }
 83 
 84 static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
 85 {
 86         struct pata_imx_priv *priv = ap->host->private_data;
 87         u32 val;
 88 
 89         pata_imx_set_timing(adev, priv);
 90 
 91         val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
 92         if (ata_pio_need_iordy(adev))
 93                 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
 94         else
 95                 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
 96         __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
 97 }
 98 
 99 static struct scsi_host_template pata_imx_sht = {
100         ATA_PIO_SHT(DRV_NAME),
101 };
102 
103 static struct ata_port_operations pata_imx_port_ops = {
104         .inherits               = &ata_sff_port_ops,
105         .sff_data_xfer          = ata_sff_data_xfer_noirq,
106         .cable_detect           = ata_cable_unknown,
107         .set_piomode            = pata_imx_set_piomode,
108 };
109 
110 static void pata_imx_setup_port(struct ata_ioports *ioaddr)
111 {
112         /* Fixup the port shift for platforms that need it */
113         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << 2);
114         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << 2);
115         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
116         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << 2);
117         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << 2);
118         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << 2);
119         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << 2);
120         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << 2);
121         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << 2);
122         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << 2);
123 }
124 
125 static int pata_imx_probe(struct platform_device *pdev)
126 {
127         struct ata_host *host;
128         struct ata_port *ap;
129         struct pata_imx_priv *priv;
130         int irq = 0;
131         struct resource *io_res;
132         int ret;
133 
134         irq = platform_get_irq(pdev, 0);
135         if (irq < 0)
136                 return irq;
137 
138         priv = devm_kzalloc(&pdev->dev,
139                                 sizeof(struct pata_imx_priv), GFP_KERNEL);
140         if (!priv)
141                 return -ENOMEM;
142 
143         priv->clk = devm_clk_get(&pdev->dev, NULL);
144         if (IS_ERR(priv->clk)) {
145                 dev_err(&pdev->dev, "Failed to get clock\n");
146                 return PTR_ERR(priv->clk);
147         }
148 
149         ret = clk_prepare_enable(priv->clk);
150         if (ret)
151                 return ret;
152 
153         host = ata_host_alloc(&pdev->dev, 1);
154         if (!host) {
155                 ret = -ENOMEM;
156                 goto err;
157         }
158 
159         host->private_data = priv;
160         ap = host->ports[0];
161 
162         ap->ops = &pata_imx_port_ops;
163         ap->pio_mask = ATA_PIO4;
164         ap->flags |= ATA_FLAG_SLAVE_POSS;
165 
166         io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
167         priv->host_regs = devm_ioremap_resource(&pdev->dev, io_res);
168         if (IS_ERR(priv->host_regs)) {
169                 ret = PTR_ERR(priv->host_regs);
170                 goto err;
171         }
172 
173         ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
174         ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
175 
176         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
177 
178         pata_imx_setup_port(&ap->ioaddr);
179 
180         ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
181                 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
182                 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
183 
184         /* deassert resets */
185         __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
186                         PATA_IMX_ATA_CTRL_ATA_RST_B,
187                         priv->host_regs + PATA_IMX_ATA_CONTROL);
188         /* enable interrupts */
189         __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
190                         priv->host_regs + PATA_IMX_ATA_INT_EN);
191 
192         /* activate */
193         ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
194                                 &pata_imx_sht);
195 
196         if (ret)
197                 goto err;
198 
199         return 0;
200 err:
201         clk_disable_unprepare(priv->clk);
202 
203         return ret;
204 }
205 
206 static int pata_imx_remove(struct platform_device *pdev)
207 {
208         struct ata_host *host = platform_get_drvdata(pdev);
209         struct pata_imx_priv *priv = host->private_data;
210 
211         ata_host_detach(host);
212 
213         __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
214 
215         clk_disable_unprepare(priv->clk);
216 
217         return 0;
218 }
219 
220 #ifdef CONFIG_PM_SLEEP
221 static int pata_imx_suspend(struct device *dev)
222 {
223         struct ata_host *host = dev_get_drvdata(dev);
224         struct pata_imx_priv *priv = host->private_data;
225         int ret;
226 
227         ret = ata_host_suspend(host, PMSG_SUSPEND);
228         if (!ret) {
229                 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
230                 priv->ata_ctl =
231                         __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
232                 clk_disable_unprepare(priv->clk);
233         }
234 
235         return ret;
236 }
237 
238 static int pata_imx_resume(struct device *dev)
239 {
240         struct ata_host *host = dev_get_drvdata(dev);
241         struct pata_imx_priv *priv = host->private_data;
242 
243         int ret = clk_prepare_enable(priv->clk);
244         if (ret)
245                 return ret;
246 
247         __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
248 
249         __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
250                         priv->host_regs + PATA_IMX_ATA_INT_EN);
251 
252         ata_host_resume(host);
253 
254         return 0;
255 }
256 #endif
257 
258 static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
259 
260 static const struct of_device_id imx_pata_dt_ids[] = {
261         {
262                 .compatible = "fsl,imx27-pata",
263         }, {
264                 /* sentinel */
265         }
266 };
267 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
268 
269 static struct platform_driver pata_imx_driver = {
270         .probe          = pata_imx_probe,
271         .remove         = pata_imx_remove,
272         .driver = {
273                 .name           = DRV_NAME,
274                 .of_match_table = imx_pata_dt_ids,
275                 .pm             = &pata_imx_pm_ops,
276         },
277 };
278 
279 module_platform_driver(pata_imx_driver);
280 
281 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
282 MODULE_DESCRIPTION("low-level driver for iMX PATA");
283 MODULE_LICENSE("GPL");
284 MODULE_ALIAS("platform:" DRV_NAME);
285 

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