pata_falcon.c 6.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Atari Falcon PATA controller driver
  4. *
  5. * Copyright (c) 2016 Samsung Electronics Co., Ltd.
  6. * http://www.samsung.com
  7. *
  8. * Based on falconide.c:
  9. *
  10. * Created 12 Jul 1997 by Geert Uytterhoeven
  11. */
  12. #include <linux/kernel.h>
  13. #include <linux/module.h>
  14. #include <linux/init.h>
  15. #include <linux/blkdev.h>
  16. #include <linux/delay.h>
  17. #include <scsi/scsi_host.h>
  18. #include <scsi/scsi_cmnd.h>
  19. #include <linux/ata.h>
  20. #include <linux/libata.h>
  21. #include <linux/mm.h>
  22. #include <linux/interrupt.h>
  23. #include <linux/platform_device.h>
  24. #include <asm/setup.h>
  25. #include <asm/atarihw.h>
  26. #include <asm/atariints.h>
  27. #include <asm/atari_stdma.h>
  28. #include <asm/ide.h>
  29. #define DRV_NAME "pata_falcon"
  30. #define DRV_VERSION "0.1.0"
  31. static struct scsi_host_template pata_falcon_sht = {
  32. ATA_PIO_SHT(DRV_NAME),
  33. };
  34. static unsigned int pata_falcon_data_xfer(struct ata_queued_cmd *qc,
  35. unsigned char *buf,
  36. unsigned int buflen, int rw)
  37. {
  38. struct ata_device *dev = qc->dev;
  39. struct ata_port *ap = dev->link->ap;
  40. void __iomem *data_addr = ap->ioaddr.data_addr;
  41. unsigned int words = buflen >> 1;
  42. struct scsi_cmnd *cmd = qc->scsicmd;
  43. bool swap = 1;
  44. if (dev->class == ATA_DEV_ATA && cmd &&
  45. !blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
  46. swap = 0;
  47. /* Transfer multiple of 2 bytes */
  48. if (rw == READ) {
  49. if (swap)
  50. raw_insw_swapw(data_addr, (u16 *)buf, words);
  51. else
  52. raw_insw(data_addr, (u16 *)buf, words);
  53. } else {
  54. if (swap)
  55. raw_outsw_swapw(data_addr, (u16 *)buf, words);
  56. else
  57. raw_outsw(data_addr, (u16 *)buf, words);
  58. }
  59. /* Transfer trailing byte, if any. */
  60. if (unlikely(buflen & 0x01)) {
  61. unsigned char pad[2] = { };
  62. /* Point buf to the tail of buffer */
  63. buf += buflen - 1;
  64. if (rw == READ) {
  65. if (swap)
  66. raw_insw_swapw(data_addr, (u16 *)pad, 1);
  67. else
  68. raw_insw(data_addr, (u16 *)pad, 1);
  69. *buf = pad[0];
  70. } else {
  71. pad[0] = *buf;
  72. if (swap)
  73. raw_outsw_swapw(data_addr, (u16 *)pad, 1);
  74. else
  75. raw_outsw(data_addr, (u16 *)pad, 1);
  76. }
  77. words++;
  78. }
  79. return words << 1;
  80. }
  81. /*
  82. * Provide our own set_mode() as we don't want to change anything that has
  83. * already been configured..
  84. */
  85. static int pata_falcon_set_mode(struct ata_link *link,
  86. struct ata_device **unused)
  87. {
  88. struct ata_device *dev;
  89. ata_for_each_dev(dev, link, ENABLED) {
  90. /* We don't really care */
  91. dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  92. dev->xfer_shift = ATA_SHIFT_PIO;
  93. dev->flags |= ATA_DFLAG_PIO;
  94. ata_dev_info(dev, "configured for PIO\n");
  95. }
  96. return 0;
  97. }
  98. static struct ata_port_operations pata_falcon_ops = {
  99. .inherits = &ata_sff_port_ops,
  100. .sff_data_xfer = pata_falcon_data_xfer,
  101. .cable_detect = ata_cable_unknown,
  102. .set_mode = pata_falcon_set_mode,
  103. };
  104. static int __init pata_falcon_init_one(struct platform_device *pdev)
  105. {
  106. struct resource *base_mem_res, *ctl_mem_res;
  107. struct resource *base_res, *ctl_res, *irq_res;
  108. struct ata_host *host;
  109. struct ata_port *ap;
  110. void __iomem *base, *ctl_base;
  111. int irq = 0, io_offset = 1, reg_shift = 2; /* Falcon defaults */
  112. dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n");
  113. base_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
  114. if (base_res && !devm_request_region(&pdev->dev, base_res->start,
  115. resource_size(base_res), DRV_NAME)) {
  116. dev_err(&pdev->dev, "resources busy\n");
  117. return -EBUSY;
  118. }
  119. ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
  120. if (ctl_res && !devm_request_region(&pdev->dev, ctl_res->start,
  121. resource_size(ctl_res), DRV_NAME)) {
  122. dev_err(&pdev->dev, "resources busy\n");
  123. return -EBUSY;
  124. }
  125. base_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  126. if (!base_mem_res)
  127. return -ENODEV;
  128. if (!devm_request_mem_region(&pdev->dev, base_mem_res->start,
  129. resource_size(base_mem_res), DRV_NAME)) {
  130. dev_err(&pdev->dev, "resources busy\n");
  131. return -EBUSY;
  132. }
  133. ctl_mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  134. if (!ctl_mem_res)
  135. return -ENODEV;
  136. /* allocate host */
  137. host = ata_host_alloc(&pdev->dev, 1);
  138. if (!host)
  139. return -ENOMEM;
  140. ap = host->ports[0];
  141. ap->ops = &pata_falcon_ops;
  142. ap->pio_mask = ATA_PIO4;
  143. ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
  144. /* N.B. this assumes data_addr will be used for word-sized I/O only */
  145. ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start;
  146. if (base_res) { /* only Q40 has IO resources */
  147. io_offset = 0x10000;
  148. reg_shift = 0;
  149. base = (void __iomem *)base_res->start;
  150. ctl_base = (void __iomem *)ctl_res->start;
  151. } else {
  152. base = (void __iomem *)base_mem_res->start;
  153. ctl_base = (void __iomem *)ctl_mem_res->start;
  154. }
  155. ap->ioaddr.error_addr = base + io_offset + (1 << reg_shift);
  156. ap->ioaddr.feature_addr = base + io_offset + (1 << reg_shift);
  157. ap->ioaddr.nsect_addr = base + io_offset + (2 << reg_shift);
  158. ap->ioaddr.lbal_addr = base + io_offset + (3 << reg_shift);
  159. ap->ioaddr.lbam_addr = base + io_offset + (4 << reg_shift);
  160. ap->ioaddr.lbah_addr = base + io_offset + (5 << reg_shift);
  161. ap->ioaddr.device_addr = base + io_offset + (6 << reg_shift);
  162. ap->ioaddr.status_addr = base + io_offset + (7 << reg_shift);
  163. ap->ioaddr.command_addr = base + io_offset + (7 << reg_shift);
  164. ap->ioaddr.altstatus_addr = ctl_base + io_offset;
  165. ap->ioaddr.ctl_addr = ctl_base + io_offset;
  166. ata_port_desc(ap, "cmd %px ctl %px data %px",
  167. base, ctl_base, ap->ioaddr.data_addr);
  168. irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  169. if (irq_res && irq_res->start > 0) {
  170. irq = irq_res->start;
  171. } else {
  172. ap->flags |= ATA_FLAG_PIO_POLLING;
  173. ata_port_desc(ap, "no IRQ, using PIO polling");
  174. }
  175. /* activate */
  176. return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
  177. IRQF_SHARED, &pata_falcon_sht);
  178. }
  179. static int __exit pata_falcon_remove_one(struct platform_device *pdev)
  180. {
  181. struct ata_host *host = platform_get_drvdata(pdev);
  182. ata_host_detach(host);
  183. return 0;
  184. }
  185. static struct platform_driver pata_falcon_driver = {
  186. .remove = __exit_p(pata_falcon_remove_one),
  187. .driver = {
  188. .name = "atari-falcon-ide",
  189. },
  190. };
  191. module_platform_driver_probe(pata_falcon_driver, pata_falcon_init_one);
  192. MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
  193. MODULE_DESCRIPTION("low-level driver for Atari Falcon PATA");
  194. MODULE_LICENSE("GPL v2");
  195. MODULE_ALIAS("platform:atari-falcon-ide");
  196. MODULE_VERSION(DRV_VERSION);