1 /* 2 * AHCI glue platform driver for Marvell EBU SOCs 3 * 4 * Copyright (C) 2014 Marvell 5 * 6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 7 * Marcin Wojtas <mw@semihalf.com> 8 * 9 * This file is licensed under the terms of the GNU General Public 10 * License version 2. This program is licensed "as is" without any 11 * warranty of any kind, whether express or implied. 12 */ 13 14 #include <linux/ahci_platform.h> 15 #include <linux/kernel.h> 16 #include <linux/mbus.h> 17 #include <linux/module.h> 18 #include <linux/of_device.h> 19 #include <linux/platform_device.h> 20 #include "ahci.h" 21 22 #define DRV_NAME "ahci-mvebu" 23 24 #define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0 25 #define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4 26 27 #define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4)) 28 #define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4)) 29 #define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4)) 30 31 static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv, 32 const struct mbus_dram_target_info *dram) 33 { 34 int i; 35 36 for (i = 0; i < 4; i++) { 37 writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i)); 38 writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i)); 39 writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i)); 40 } 41 42 for (i = 0; i < dram->num_cs; i++) { 43 const struct mbus_dram_window *cs = dram->cs + i; 44 45 writel((cs->mbus_attr << 8) | 46 (dram->mbus_dram_target_id << 4) | 1, 47 hpriv->mmio + AHCI_WINDOW_CTRL(i)); 48 writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i)); 49 writel(((cs->size - 1) & 0xffff0000), 50 hpriv->mmio + AHCI_WINDOW_SIZE(i)); 51 } 52 } 53 54 static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv) 55 { 56 /* 57 * Enable the regret bit to allow the SATA unit to regret a 58 * request that didn't receive an acknowlegde and avoid a 59 * deadlock 60 */ 61 writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR); 62 writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA); 63 } 64 65 static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state) 66 { 67 return ahci_platform_suspend_host(&pdev->dev); 68 } 69 70 static int ahci_mvebu_resume(struct platform_device *pdev) 71 { 72 struct ata_host *host = platform_get_drvdata(pdev); 73 struct ahci_host_priv *hpriv = host->private_data; 74 const struct mbus_dram_target_info *dram; 75 76 dram = mv_mbus_dram_info(); 77 if (dram) 78 ahci_mvebu_mbus_config(hpriv, dram); 79 80 ahci_mvebu_regret_option(hpriv); 81 82 return ahci_platform_resume_host(&pdev->dev); 83 } 84 85 static const struct ata_port_info ahci_mvebu_port_info = { 86 .flags = AHCI_FLAG_COMMON, 87 .pio_mask = ATA_PIO4, 88 .udma_mask = ATA_UDMA6, 89 .port_ops = &ahci_platform_ops, 90 }; 91 92 static struct scsi_host_template ahci_platform_sht = { 93 AHCI_SHT(DRV_NAME), 94 }; 95 96 static int ahci_mvebu_probe(struct platform_device *pdev) 97 { 98 struct ahci_host_priv *hpriv; 99 const struct mbus_dram_target_info *dram; 100 int rc; 101 102 hpriv = ahci_platform_get_resources(pdev); 103 if (IS_ERR(hpriv)) 104 return PTR_ERR(hpriv); 105 106 rc = ahci_platform_enable_resources(hpriv); 107 if (rc) 108 return rc; 109 110 dram = mv_mbus_dram_info(); 111 if (!dram) 112 return -ENODEV; 113 114 ahci_mvebu_mbus_config(hpriv, dram); 115 ahci_mvebu_regret_option(hpriv); 116 117 rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info, 118 &ahci_platform_sht); 119 if (rc) 120 goto disable_resources; 121 122 return 0; 123 124 disable_resources: 125 ahci_platform_disable_resources(hpriv); 126 return rc; 127 } 128 129 static const struct of_device_id ahci_mvebu_of_match[] = { 130 { .compatible = "marvell,armada-380-ahci", }, 131 { }, 132 }; 133 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match); 134 135 /* 136 * We currently don't provide power management related operations, 137 * since there is no suspend/resume support at the platform level for 138 * Armada 38x for the moment. 139 */ 140 static struct platform_driver ahci_mvebu_driver = { 141 .probe = ahci_mvebu_probe, 142 .remove = ata_platform_remove_one, 143 .suspend = ahci_mvebu_suspend, 144 .resume = ahci_mvebu_resume, 145 .driver = { 146 .name = DRV_NAME, 147 .of_match_table = ahci_mvebu_of_match, 148 }, 149 }; 150 module_platform_driver(ahci_mvebu_driver); 151 152 MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver"); 153 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>"); 154 MODULE_LICENSE("GPL"); 155 MODULE_ALIAS("platform:ahci_mvebu"); 156