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
pata_imx_set_timing(struct ata_device * adev,struct pata_imx_priv * priv)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
pata_imx_set_piomode(struct ata_port * ap,struct ata_device * adev)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 const 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_xfer32,
106 .cable_detect = ata_cable_unknown,
107 .set_piomode = pata_imx_set_piomode,
108 };
109
pata_imx_setup_port(struct ata_ioports * ioaddr)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
pata_imx_probe(struct platform_device * pdev)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_enabled(&pdev->dev, NULL);
144 if (IS_ERR(priv->clk)) {
145 dev_err(&pdev->dev, "Failed to get and enable clock\n");
146 return PTR_ERR(priv->clk);
147 }
148
149 host = ata_host_alloc(&pdev->dev, 1);
150 if (!host)
151 return -ENOMEM;
152
153 host->private_data = priv;
154 ap = host->ports[0];
155
156 ap->ops = &pata_imx_port_ops;
157 ap->pio_mask = ATA_PIO4;
158 ap->flags |= ATA_FLAG_SLAVE_POSS;
159
160 priv->host_regs = devm_platform_get_and_ioremap_resource(pdev, 0, &io_res);
161 if (IS_ERR(priv->host_regs))
162 return PTR_ERR(priv->host_regs);
163
164 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
165 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
166
167 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
168
169 pata_imx_setup_port(&ap->ioaddr);
170
171 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
172 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
173 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
174
175 /* deassert resets */
176 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
177 PATA_IMX_ATA_CTRL_ATA_RST_B,
178 priv->host_regs + PATA_IMX_ATA_CONTROL);
179 /* enable interrupts */
180 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
181 priv->host_regs + PATA_IMX_ATA_INT_EN);
182
183 /* activate */
184 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
185 &pata_imx_sht);
186
187 if (ret)
188 return ret;
189
190 return 0;
191 }
192
pata_imx_remove(struct platform_device * pdev)193 static void pata_imx_remove(struct platform_device *pdev)
194 {
195 struct ata_host *host = platform_get_drvdata(pdev);
196 struct pata_imx_priv *priv = host->private_data;
197
198 ata_host_detach(host);
199
200 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
201 }
202
203 #ifdef CONFIG_PM_SLEEP
pata_imx_suspend(struct device * dev)204 static int pata_imx_suspend(struct device *dev)
205 {
206 struct ata_host *host = dev_get_drvdata(dev);
207 struct pata_imx_priv *priv = host->private_data;
208
209 ata_host_suspend(host, PMSG_SUSPEND);
210
211 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
212 priv->ata_ctl = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
213 clk_disable_unprepare(priv->clk);
214
215 return 0;
216 }
217
pata_imx_resume(struct device * dev)218 static int pata_imx_resume(struct device *dev)
219 {
220 struct ata_host *host = dev_get_drvdata(dev);
221 struct pata_imx_priv *priv = host->private_data;
222
223 int ret = clk_prepare_enable(priv->clk);
224 if (ret)
225 return ret;
226
227 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
228
229 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
230 priv->host_regs + PATA_IMX_ATA_INT_EN);
231
232 ata_host_resume(host);
233
234 return 0;
235 }
236 #endif
237
238 static SIMPLE_DEV_PM_OPS(pata_imx_pm_ops, pata_imx_suspend, pata_imx_resume);
239
240 static const struct of_device_id imx_pata_dt_ids[] = {
241 {
242 .compatible = "fsl,imx27-pata",
243 }, {
244 /* sentinel */
245 }
246 };
247 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
248
249 static struct platform_driver pata_imx_driver = {
250 .probe = pata_imx_probe,
251 .remove = pata_imx_remove,
252 .driver = {
253 .name = DRV_NAME,
254 .of_match_table = imx_pata_dt_ids,
255 .pm = &pata_imx_pm_ops,
256 },
257 };
258
259 module_platform_driver(pata_imx_driver);
260
261 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
262 MODULE_DESCRIPTION("low-level driver for iMX PATA");
263 MODULE_LICENSE("GPL");
264 MODULE_ALIAS("platform:" DRV_NAME);
265