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 AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0 23 #define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4 24 25 #define AHCI_WINDOW_CTRL(win) (0x60 + ((win) << 4)) 26 #define AHCI_WINDOW_BASE(win) (0x64 + ((win) << 4)) 27 #define AHCI_WINDOW_SIZE(win) (0x68 + ((win) << 4)) 28 29 static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv, 30 const struct mbus_dram_target_info *dram) 31 { 32 int i; 33 34 for (i = 0; i < 4; i++) { 35 writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i)); 36 writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i)); 37 writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i)); 38 } 39 40 for (i = 0; i < dram->num_cs; i++) { 41 const struct mbus_dram_window *cs = dram->cs + i; 42 43 writel((cs->mbus_attr << 8) | 44 (dram->mbus_dram_target_id << 4) | 1, 45 hpriv->mmio + AHCI_WINDOW_CTRL(i)); 46 writel(cs->base, hpriv->mmio + AHCI_WINDOW_BASE(i)); 47 writel(((cs->size - 1) & 0xffff0000), 48 hpriv->mmio + AHCI_WINDOW_SIZE(i)); 49 } 50 } 51 52 static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv) 53 { 54 /* 55 * Enable the regret bit to allow the SATA unit to regret a 56 * request that didn't receive an acknowlegde and avoid a 57 * deadlock 58 */ 59 writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR); 60 writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA); 61 } 62 63 static const struct ata_port_info ahci_mvebu_port_info = { 64 .flags = AHCI_FLAG_COMMON, 65 .pio_mask = ATA_PIO4, 66 .udma_mask = ATA_UDMA6, 67 .port_ops = &ahci_platform_ops, 68 }; 69 70 static int ahci_mvebu_probe(struct platform_device *pdev) 71 { 72 struct ahci_host_priv *hpriv; 73 const struct mbus_dram_target_info *dram; 74 int rc; 75 76 hpriv = ahci_platform_get_resources(pdev); 77 if (IS_ERR(hpriv)) 78 return PTR_ERR(hpriv); 79 80 rc = ahci_platform_enable_resources(hpriv); 81 if (rc) 82 return rc; 83 84 dram = mv_mbus_dram_info(); 85 if (!dram) 86 return -ENODEV; 87 88 ahci_mvebu_mbus_config(hpriv, dram); 89 ahci_mvebu_regret_option(hpriv); 90 91 rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info); 92 if (rc) 93 goto disable_resources; 94 95 return 0; 96 97 disable_resources: 98 ahci_platform_disable_resources(hpriv); 99 return rc; 100 } 101 102 static const struct of_device_id ahci_mvebu_of_match[] = { 103 { .compatible = "marvell,armada-380-ahci", }, 104 { }, 105 }; 106 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match); 107 108 /* 109 * We currently don't provide power management related operations, 110 * since there is no suspend/resume support at the platform level for 111 * Armada 38x for the moment. 112 */ 113 static struct platform_driver ahci_mvebu_driver = { 114 .probe = ahci_mvebu_probe, 115 .remove = ata_platform_remove_one, 116 .driver = { 117 .name = "ahci-mvebu", 118 .of_match_table = ahci_mvebu_of_match, 119 }, 120 }; 121 module_platform_driver(ahci_mvebu_driver); 122 123 MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver"); 124 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>"); 125 MODULE_LICENSE("GPL"); 126 MODULE_ALIAS("platform:ahci_mvebu"); 127