2 * drivers/ata/pata_mpc52xx.c
4 * libata driver for the Freescale MPC52xx on-chip IDE interface
6 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
7 * Copyright (C) 2003 Mipsys - Benjamin Herrenschmidt
9 * This file is licensed under the terms of the GNU General Public License
10 * version 2. This program is licensed "as is" without any warranty of any
11 * kind, whether express or implied.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/delay.h>
18 #include <linux/libata.h>
19 #include <linux/of_platform.h>
21 #include <asm/types.h>
23 #include <asm/mpc52xx.h>
26 #define DRV_NAME "mpc52xx_ata"
27 #define DRV_VERSION "0.1.2"
30 /* Private structures used by the driver */
31 struct mpc52xx_ata_timings {
36 struct mpc52xx_ata_priv {
37 unsigned int ipb_period;
38 struct mpc52xx_ata __iomem * ata_regs;
40 struct mpc52xx_ata_timings timings[2];
45 /* ATAPI-4 PIO specs (in ns) */
46 static const int ataspec_t0[5] = {600, 383, 240, 180, 120};
47 static const int ataspec_t1[5] = { 70, 50, 30, 30, 25};
48 static const int ataspec_t2_8[5] = {290, 290, 290, 80, 70};
49 static const int ataspec_t2_16[5] = {165, 125, 100, 80, 70};
50 static const int ataspec_t2i[5] = { 0, 0, 0, 70, 25};
51 static const int ataspec_t4[5] = { 30, 20, 15, 10, 10};
52 static const int ataspec_ta[5] = { 35, 35, 35, 35, 35};
54 #define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))
57 /* Bit definitions inside the registers */
58 #define MPC52xx_ATA_HOSTCONF_SMR 0x80000000UL /* State machine reset */
59 #define MPC52xx_ATA_HOSTCONF_FR 0x40000000UL /* FIFO Reset */
60 #define MPC52xx_ATA_HOSTCONF_IE 0x02000000UL /* Enable interrupt in PIO */
61 #define MPC52xx_ATA_HOSTCONF_IORDY 0x01000000UL /* Drive supports IORDY protocol */
63 #define MPC52xx_ATA_HOSTSTAT_TIP 0x80000000UL /* Transaction in progress */
64 #define MPC52xx_ATA_HOSTSTAT_UREP 0x40000000UL /* UDMA Read Extended Pause */
65 #define MPC52xx_ATA_HOSTSTAT_RERR 0x02000000UL /* Read Error */
66 #define MPC52xx_ATA_HOSTSTAT_WERR 0x01000000UL /* Write Error */
68 #define MPC52xx_ATA_FIFOSTAT_EMPTY 0x01 /* FIFO Empty */
70 #define MPC52xx_ATA_DMAMODE_WRITE 0x01 /* Write DMA */
71 #define MPC52xx_ATA_DMAMODE_READ 0x02 /* Read DMA */
72 #define MPC52xx_ATA_DMAMODE_UDMA 0x04 /* UDMA enabled */
73 #define MPC52xx_ATA_DMAMODE_IE 0x08 /* Enable drive interrupt to CPU in DMA mode */
74 #define MPC52xx_ATA_DMAMODE_FE 0x10 /* FIFO Flush enable in Rx mode */
75 #define MPC52xx_ATA_DMAMODE_FR 0x20 /* FIFO Reset */
76 #define MPC52xx_ATA_DMAMODE_HUT 0x40 /* Host UDMA burst terminate */
79 /* Structure of the hardware registers */
82 /* Host interface registers */
83 u32 config; /* ATA + 0x00 Host configuration */
84 u32 host_status; /* ATA + 0x04 Host controller status */
85 u32 pio1; /* ATA + 0x08 PIO Timing 1 */
86 u32 pio2; /* ATA + 0x0c PIO Timing 2 */
87 u32 mdma1; /* ATA + 0x10 MDMA Timing 1 */
88 u32 mdma2; /* ATA + 0x14 MDMA Timing 2 */
89 u32 udma1; /* ATA + 0x18 UDMA Timing 1 */
90 u32 udma2; /* ATA + 0x1c UDMA Timing 2 */
91 u32 udma3; /* ATA + 0x20 UDMA Timing 3 */
92 u32 udma4; /* ATA + 0x24 UDMA Timing 4 */
93 u32 udma5; /* ATA + 0x28 UDMA Timing 5 */
94 u32 share_cnt; /* ATA + 0x2c ATA share counter */
98 u32 fifo_data; /* ATA + 0x3c */
99 u8 fifo_status_frame; /* ATA + 0x40 */
100 u8 fifo_status; /* ATA + 0x41 */
102 u8 fifo_control; /* ATA + 0x44 */
104 u16 fifo_alarm; /* ATA + 0x4a */
106 u16 fifo_rdp; /* ATA + 0x4e */
108 u16 fifo_wrp; /* ATA + 0x52 */
110 u16 fifo_lfrdp; /* ATA + 0x56 */
112 u16 fifo_lfwrp; /* ATA + 0x5a */
114 /* Drive TaskFile registers */
115 u8 tf_control; /* ATA + 0x5c TASKFILE Control/Alt Status */
117 u16 tf_data; /* ATA + 0x60 TASKFILE Data */
119 u8 tf_features; /* ATA + 0x64 TASKFILE Features/Error */
121 u8 tf_sec_count; /* ATA + 0x68 TASKFILE Sector Count */
123 u8 tf_sec_num; /* ATA + 0x6c TASKFILE Sector Number */
125 u8 tf_cyl_low; /* ATA + 0x70 TASKFILE Cylinder Low */
127 u8 tf_cyl_high; /* ATA + 0x74 TASKFILE Cylinder High */
129 u8 tf_dev_head; /* ATA + 0x78 TASKFILE Device/Head */
131 u8 tf_command; /* ATA + 0x7c TASKFILE Command/Status */
132 u8 dma_mode; /* ATA + 0x7d ATA Host DMA Mode configuration */
137 /* ======================================================================== */
139 /* ======================================================================== */
142 /* MPC52xx low level hw control */
145 mpc52xx_ata_compute_pio_timings(struct mpc52xx_ata_priv *priv, int dev, int pio)
147 struct mpc52xx_ata_timings *timing = &priv->timings[dev];
148 unsigned int ipb_period = priv->ipb_period;
149 unsigned int t0, t1, t2_8, t2_16, t2i, t4, ta;
151 if ((pio<0) || (pio>4))
154 t0 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t0[pio]);
155 t1 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t1[pio]);
156 t2_8 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_8[pio]);
157 t2_16 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2_16[pio]);
158 t2i = CALC_CLKCYC(ipb_period, 1000 * ataspec_t2i[pio]);
159 t4 = CALC_CLKCYC(ipb_period, 1000 * ataspec_t4[pio]);
160 ta = CALC_CLKCYC(ipb_period, 1000 * ataspec_ta[pio]);
162 timing->pio1 = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8) | (t2i);
163 timing->pio2 = (t4 << 24) | (t1 << 16) | (ta << 8);
169 mpc52xx_ata_apply_timings(struct mpc52xx_ata_priv *priv, int device)
171 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
172 struct mpc52xx_ata_timings *timing = &priv->timings[device];
174 out_be32(®s->pio1, timing->pio1);
175 out_be32(®s->pio2, timing->pio2);
176 out_be32(®s->mdma1, 0);
177 out_be32(®s->mdma2, 0);
178 out_be32(®s->udma1, 0);
179 out_be32(®s->udma2, 0);
180 out_be32(®s->udma3, 0);
181 out_be32(®s->udma4, 0);
182 out_be32(®s->udma5, 0);
188 mpc52xx_ata_hw_init(struct mpc52xx_ata_priv *priv)
190 struct mpc52xx_ata __iomem *regs = priv->ata_regs;
193 /* Clear share_cnt (all sample code do this ...) */
194 out_be32(®s->share_cnt, 0);
196 /* Configure and reset host */
197 out_be32(®s->config,
198 MPC52xx_ATA_HOSTCONF_IE |
199 MPC52xx_ATA_HOSTCONF_IORDY |
200 MPC52xx_ATA_HOSTCONF_SMR |
201 MPC52xx_ATA_HOSTCONF_FR);
205 out_be32(®s->config,
206 MPC52xx_ATA_HOSTCONF_IE |
207 MPC52xx_ATA_HOSTCONF_IORDY);
209 /* Set the time slot to 1us */
210 tslot = CALC_CLKCYC(priv->ipb_period, 1000000);
211 out_be32(®s->share_cnt, tslot << 16 );
213 /* Init timings to PIO0 */
214 memset(priv->timings, 0x00, 2*sizeof(struct mpc52xx_ata_timings));
216 mpc52xx_ata_compute_pio_timings(priv, 0, 0);
217 mpc52xx_ata_compute_pio_timings(priv, 1, 0);
219 mpc52xx_ata_apply_timings(priv, 0);
225 /* ======================================================================== */
227 /* ======================================================================== */
230 mpc52xx_ata_set_piomode(struct ata_port *ap, struct ata_device *adev)
232 struct mpc52xx_ata_priv *priv = ap->host->private_data;
235 pio = adev->pio_mode - XFER_PIO_0;
237 rv = mpc52xx_ata_compute_pio_timings(priv, adev->devno, pio);
240 printk(KERN_ERR DRV_NAME
241 ": Trying to select invalid PIO mode %d\n", pio);
245 mpc52xx_ata_apply_timings(priv, adev->devno);
248 mpc52xx_ata_dev_select(struct ata_port *ap, unsigned int device)
250 struct mpc52xx_ata_priv *priv = ap->host->private_data;
252 if (device != priv->csel)
253 mpc52xx_ata_apply_timings(priv, device);
255 ata_sff_dev_select(ap,device);
258 static struct scsi_host_template mpc52xx_ata_sht = {
259 ATA_PIO_SHT(DRV_NAME),
262 static struct ata_port_operations mpc52xx_ata_port_ops = {
263 .inherits = &ata_sff_port_ops,
264 .sff_dev_select = mpc52xx_ata_dev_select,
265 .cable_detect = ata_cable_40wire,
266 .set_piomode = mpc52xx_ata_set_piomode,
267 .post_internal_cmd = ATA_OP_NULL,
271 mpc52xx_ata_init_one(struct device *dev, struct mpc52xx_ata_priv *priv,
272 unsigned long raw_ata_regs)
274 struct ata_host *host;
276 struct ata_ioports *aio;
278 host = ata_host_alloc(dev, 1);
283 ap->flags |= ATA_FLAG_SLAVE_POSS;
284 ap->pio_mask = 0x1f; /* Up to PIO4 */
285 ap->mwdma_mask = 0x00; /* No MWDMA */
286 ap->udma_mask = 0x00; /* No UDMA */
287 ap->ops = &mpc52xx_ata_port_ops;
288 host->private_data = priv;
291 aio->cmd_addr = NULL; /* Don't have a classic reg block */
292 aio->altstatus_addr = &priv->ata_regs->tf_control;
293 aio->ctl_addr = &priv->ata_regs->tf_control;
294 aio->data_addr = &priv->ata_regs->tf_data;
295 aio->error_addr = &priv->ata_regs->tf_features;
296 aio->feature_addr = &priv->ata_regs->tf_features;
297 aio->nsect_addr = &priv->ata_regs->tf_sec_count;
298 aio->lbal_addr = &priv->ata_regs->tf_sec_num;
299 aio->lbam_addr = &priv->ata_regs->tf_cyl_low;
300 aio->lbah_addr = &priv->ata_regs->tf_cyl_high;
301 aio->device_addr = &priv->ata_regs->tf_dev_head;
302 aio->status_addr = &priv->ata_regs->tf_command;
303 aio->command_addr = &priv->ata_regs->tf_command;
305 ata_port_desc(ap, "ata_regs 0x%lx", raw_ata_regs);
308 return ata_host_activate(host, priv->ata_irq, ata_sff_interrupt, 0,
312 static struct mpc52xx_ata_priv *
313 mpc52xx_ata_remove_one(struct device *dev)
315 struct ata_host *host = dev_get_drvdata(dev);
316 struct mpc52xx_ata_priv *priv = host->private_data;
318 ata_host_detach(host);
324 /* ======================================================================== */
325 /* OF Platform driver */
326 /* ======================================================================== */
329 mpc52xx_ata_probe(struct of_device *op, const struct of_device_id *match)
331 unsigned int ipb_freq;
332 struct resource res_mem;
334 struct mpc52xx_ata __iomem *ata_regs;
335 struct mpc52xx_ata_priv *priv;
338 /* Get ipb frequency */
339 ipb_freq = mpc52xx_find_ipb_freq(op->node);
341 printk(KERN_ERR DRV_NAME ": "
342 "Unable to find IPB Bus frequency\n" );
346 /* Get IRQ and register */
347 rv = of_address_to_resource(op->node, 0, &res_mem);
349 printk(KERN_ERR DRV_NAME ": "
350 "Error while parsing device node resource\n" );
354 ata_irq = irq_of_parse_and_map(op->node, 0);
355 if (ata_irq == NO_IRQ) {
356 printk(KERN_ERR DRV_NAME ": "
357 "Error while mapping the irq\n");
361 /* Request mem region */
362 if (!devm_request_mem_region(&op->dev, res_mem.start,
363 sizeof(struct mpc52xx_ata), DRV_NAME)) {
364 printk(KERN_ERR DRV_NAME ": "
365 "Error while requesting mem region\n");
370 /* Remap registers */
371 ata_regs = devm_ioremap(&op->dev, res_mem.start,
372 sizeof(struct mpc52xx_ata));
374 printk(KERN_ERR DRV_NAME ": "
375 "Error while mapping register set\n");
380 /* Prepare our private structure */
381 priv = devm_kzalloc(&op->dev, sizeof(struct mpc52xx_ata_priv),
384 printk(KERN_ERR DRV_NAME ": "
385 "Error while allocating private structure\n");
390 priv->ipb_period = 1000000000 / (ipb_freq / 1000);
391 priv->ata_regs = ata_regs;
392 priv->ata_irq = ata_irq;
396 rv = mpc52xx_ata_hw_init(priv);
398 printk(KERN_ERR DRV_NAME ": Error during HW init\n");
402 /* Register ourselves to libata */
403 rv = mpc52xx_ata_init_one(&op->dev, priv, res_mem.start);
405 printk(KERN_ERR DRV_NAME ": "
406 "Error while registering to ATA layer\n");
415 irq_dispose_mapping(ata_irq);
420 mpc52xx_ata_remove(struct of_device *op)
422 struct mpc52xx_ata_priv *priv;
424 priv = mpc52xx_ata_remove_one(&op->dev);
425 irq_dispose_mapping(priv->ata_irq);
434 mpc52xx_ata_suspend(struct of_device *op, pm_message_t state)
436 struct ata_host *host = dev_get_drvdata(&op->dev);
438 return ata_host_suspend(host, state);
442 mpc52xx_ata_resume(struct of_device *op)
444 struct ata_host *host = dev_get_drvdata(&op->dev);
445 struct mpc52xx_ata_priv *priv = host->private_data;
448 rv = mpc52xx_ata_hw_init(priv);
450 printk(KERN_ERR DRV_NAME ": Error during HW init\n");
454 ata_host_resume(host);
462 static struct of_device_id mpc52xx_ata_of_match[] = {
463 { .compatible = "fsl,mpc5200-ata", },
464 { .compatible = "mpc5200-ata", },
469 static struct of_platform_driver mpc52xx_ata_of_platform_driver = {
470 .owner = THIS_MODULE,
472 .match_table = mpc52xx_ata_of_match,
473 .probe = mpc52xx_ata_probe,
474 .remove = mpc52xx_ata_remove,
476 .suspend = mpc52xx_ata_suspend,
477 .resume = mpc52xx_ata_resume,
481 .owner = THIS_MODULE,
486 /* ======================================================================== */
488 /* ======================================================================== */
491 mpc52xx_ata_init(void)
493 printk(KERN_INFO "ata: MPC52xx IDE/ATA libata driver\n");
494 return of_register_platform_driver(&mpc52xx_ata_of_platform_driver);
498 mpc52xx_ata_exit(void)
500 of_unregister_platform_driver(&mpc52xx_ata_of_platform_driver);
503 module_init(mpc52xx_ata_init);
504 module_exit(mpc52xx_ata_exit);
506 MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
507 MODULE_DESCRIPTION("Freescale MPC52xx IDE/ATA libata driver");
508 MODULE_LICENSE("GPL");
509 MODULE_DEVICE_TABLE(of, mpc52xx_ata_of_match);
510 MODULE_VERSION(DRV_VERSION);