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 #ifdef CONFIG_PM_SLEEP 66 static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state) 67 { 68 return ahci_platform_suspend_host(&pdev->dev); 69 } 70 71 static int ahci_mvebu_resume(struct platform_device *pdev) 72 { 73 struct ata_host *host = platform_get_drvdata(pdev); 74 struct ahci_host_priv *hpriv = host->private_data; 75 const struct mbus_dram_target_info *dram; 76 77 dram = mv_mbus_dram_info(); 78 if (dram) 79 ahci_mvebu_mbus_config(hpriv, dram); 80 81 ahci_mvebu_regret_option(hpriv); 82 83 return ahci_platform_resume_host(&pdev->dev); 84 } 85 #else 86 #define ahci_mvebu_suspend NULL 87 #define ahci_mvebu_resume NULL 88 #endif 89 90 static const struct ata_port_info ahci_mvebu_port_info = { 91 .flags = AHCI_FLAG_COMMON, 92 .pio_mask = ATA_PIO4, 93 .udma_mask = ATA_UDMA6, 94 .port_ops = &ahci_platform_ops, 95 }; 96 97 static struct scsi_host_template ahci_platform_sht = { 98 AHCI_SHT(DRV_NAME), 99 }; 100 101 static int ahci_mvebu_probe(struct platform_device *pdev) 102 { 103 struct ahci_host_priv *hpriv; 104 const struct mbus_dram_target_info *dram; 105 int rc; 106 107 hpriv = ahci_platform_get_resources(pdev); 108 if (IS_ERR(hpriv)) 109 return PTR_ERR(hpriv); 110 111 rc = ahci_platform_enable_resources(hpriv); 112 if (rc) 113 return rc; 114 115 if (of_device_is_compatible(pdev->dev.of_node, 116 "marvell,armada-380-ahci")) { 117 dram = mv_mbus_dram_info(); 118 if (!dram) 119 return -ENODEV; 120 121 ahci_mvebu_mbus_config(hpriv, dram); 122 ahci_mvebu_regret_option(hpriv); 123 } 124 125 rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info, 126 &ahci_platform_sht); 127 if (rc) 128 goto disable_resources; 129 130 return 0; 131 132 disable_resources: 133 ahci_platform_disable_resources(hpriv); 134 return rc; 135 } 136 137 static const struct of_device_id ahci_mvebu_of_match[] = { 138 { .compatible = "marvell,armada-380-ahci", }, 139 { .compatible = "marvell,armada-3700-ahci", }, 140 { }, 141 }; 142 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match); 143 144 /* 145 * We currently don't provide power management related operations, 146 * since there is no suspend/resume support at the platform level for 147 * Armada 38x for the moment. 148 */ 149 static struct platform_driver ahci_mvebu_driver = { 150 .probe = ahci_mvebu_probe, 151 .remove = ata_platform_remove_one, 152 .suspend = ahci_mvebu_suspend, 153 .resume = ahci_mvebu_resume, 154 .driver = { 155 .name = DRV_NAME, 156 .of_match_table = ahci_mvebu_of_match, 157 }, 158 }; 159 module_platform_driver(ahci_mvebu_driver); 160 161 MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver"); 162 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>"); 163 MODULE_LICENSE("GPL"); 164 MODULE_ALIAS("platform:ahci_mvebu"); 165