2 * AHCI glue platform driver for Marvell EBU SOCs
4 * Copyright (C) 2014 Marvell
6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 * Marcin Wojtas <mw@semihalf.com>
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.
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>
22 #define DRV_NAME "ahci-mvebu"
24 #define AHCI_VENDOR_SPECIFIC_0_ADDR 0xa0
25 #define AHCI_VENDOR_SPECIFIC_0_DATA 0xa4
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))
31 struct ahci_mvebu_plat_data {
32 int (*plat_config)(struct ahci_host_priv *hpriv);
36 static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
37 const struct mbus_dram_target_info *dram)
41 for (i = 0; i < 4; i++) {
42 writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
43 writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
44 writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
47 for (i = 0; i < dram->num_cs; i++) {
48 const struct mbus_dram_window *cs = dram->cs + i;
50 writel((cs->mbus_attr << 8) |
51 (dram->mbus_dram_target_id << 4) | 1,
52 hpriv->mmio + AHCI_WINDOW_CTRL(i));
53 writel(cs->base >> 16, hpriv->mmio + AHCI_WINDOW_BASE(i));
54 writel(((cs->size - 1) & 0xffff0000),
55 hpriv->mmio + AHCI_WINDOW_SIZE(i));
59 static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
62 * Enable the regret bit to allow the SATA unit to regret a
63 * request that didn't receive an acknowlegde and avoid a
66 writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
67 writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
70 static int ahci_mvebu_armada_380_config(struct ahci_host_priv *hpriv)
72 const struct mbus_dram_target_info *dram;
75 dram = mv_mbus_dram_info();
77 ahci_mvebu_mbus_config(hpriv, dram);
81 ahci_mvebu_regret_option(hpriv);
86 static int ahci_mvebu_armada_3700_config(struct ahci_host_priv *hpriv)
90 writel(0, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
92 reg = readl(hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
94 writel(reg, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
100 * ahci_mvebu_stop_engine
102 * @ap: Target ata port
104 * Errata Ref#226 - SATA Disk HOT swap issue when connected through
105 * Port Multiplier in FIS-based Switching mode.
107 * To avoid the issue, according to design, the bits[11:8, 0] of
108 * register PxFBS are cleared when Port Command and Status (0x18) bit[0]
109 * changes its value from 1 to 0, i.e. falling edge of Port
110 * Command and Status bit[0] sends PULSE that resets PxFBS
113 * This function is used to override function of "ahci_stop_engine"
114 * from libahci.c by adding the mvebu work around(WA) to save PxFBS
115 * value before the PxCMD ST write of 0, then restore PxFBS value.
117 * Return: 0 on success; Error code otherwise.
119 static int ahci_mvebu_stop_engine(struct ata_port *ap)
121 void __iomem *port_mmio = ahci_port_base(ap);
124 tmp = readl(port_mmio + PORT_CMD);
126 /* check if the HBA is idle */
127 if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
130 /* save the port PxFBS register for later restore */
131 port_fbs = readl(port_mmio + PORT_FBS);
133 /* setting HBA to idle */
134 tmp &= ~PORT_CMD_START;
135 writel(tmp, port_mmio + PORT_CMD);
138 * bit #15 PxCMD signal doesn't clear PxFBS,
139 * restore the PxFBS register right after clearing the PxCMD ST,
140 * no need to wait for the PxCMD bit #15.
142 writel(port_fbs, port_mmio + PORT_FBS);
144 /* wait for engine to stop. This could be as long as 500 msec */
145 tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
146 PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
147 if (tmp & PORT_CMD_LIST_ON)
153 #ifdef CONFIG_PM_SLEEP
154 static int ahci_mvebu_suspend(struct platform_device *pdev, pm_message_t state)
156 return ahci_platform_suspend_host(&pdev->dev);
159 static int ahci_mvebu_resume(struct platform_device *pdev)
161 struct ata_host *host = platform_get_drvdata(pdev);
162 struct ahci_host_priv *hpriv = host->private_data;
163 const struct ahci_mvebu_plat_data *pdata = hpriv->plat_data;
165 pdata->plat_config(hpriv);
167 return ahci_platform_resume_host(&pdev->dev);
170 #define ahci_mvebu_suspend NULL
171 #define ahci_mvebu_resume NULL
174 static const struct ata_port_info ahci_mvebu_port_info = {
175 .flags = AHCI_FLAG_COMMON,
176 .pio_mask = ATA_PIO4,
177 .udma_mask = ATA_UDMA6,
178 .port_ops = &ahci_platform_ops,
181 static struct scsi_host_template ahci_platform_sht = {
185 static int ahci_mvebu_probe(struct platform_device *pdev)
187 const struct ahci_mvebu_plat_data *pdata;
188 struct ahci_host_priv *hpriv;
191 pdata = of_device_get_match_data(&pdev->dev);
195 hpriv = ahci_platform_get_resources(pdev, 0);
197 return PTR_ERR(hpriv);
199 hpriv->flags |= pdata->flags;
200 hpriv->plat_data = (void *)pdata;
202 rc = ahci_platform_enable_resources(hpriv);
206 hpriv->stop_engine = ahci_mvebu_stop_engine;
208 rc = pdata->plat_config(hpriv);
210 goto disable_resources;
212 rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info,
215 goto disable_resources;
220 ahci_platform_disable_resources(hpriv);
224 static const struct ahci_mvebu_plat_data ahci_mvebu_armada_380_plat_data = {
225 .plat_config = ahci_mvebu_armada_380_config,
228 static const struct ahci_mvebu_plat_data ahci_mvebu_armada_3700_plat_data = {
229 .plat_config = ahci_mvebu_armada_3700_config,
230 .flags = AHCI_HFLAG_SUSPEND_PHYS,
233 static const struct of_device_id ahci_mvebu_of_match[] = {
235 .compatible = "marvell,armada-380-ahci",
236 .data = &ahci_mvebu_armada_380_plat_data,
239 .compatible = "marvell,armada-3700-ahci",
240 .data = &ahci_mvebu_armada_3700_plat_data,
244 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
246 static struct platform_driver ahci_mvebu_driver = {
247 .probe = ahci_mvebu_probe,
248 .remove = ata_platform_remove_one,
249 .suspend = ahci_mvebu_suspend,
250 .resume = ahci_mvebu_resume,
253 .of_match_table = ahci_mvebu_of_match,
256 module_platform_driver(ahci_mvebu_driver);
258 MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
259 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
260 MODULE_LICENSE("GPL");
261 MODULE_ALIAS("platform:ahci_mvebu");