2 * Calxeda Highbank AHCI SATA platform driver
3 * Copyright 2012 Calxeda, Inc.
5 * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
19 #include <linux/kernel.h>
20 #include <linux/gfp.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/err.h>
26 #include <linux/spinlock.h>
27 #include <linux/device.h>
28 #include <linux/of_device.h>
29 #include <linux/of_address.h>
30 #include <linux/platform_device.h>
31 #include <linux/libata.h>
32 #include <linux/ahci_platform.h>
33 #include <linux/interrupt.h>
34 #include <linux/delay.h>
35 #include <linux/export.h>
38 #define CPHY_MAP(dev, addr) ((((dev) & 0x1f) << 7) | (((addr) >> 9) & 0x7f))
39 #define CPHY_ADDR(addr) (((addr) & 0x1ff) << 2)
40 #define SERDES_CR_CTL 0x80a0
41 #define SERDES_CR_ADDR 0x80a1
42 #define SERDES_CR_DATA 0x80a2
43 #define CR_BUSY 0x0001
44 #define CR_START 0x0001
45 #define CR_WR_RDN 0x0002
46 #define CPHY_RX_INPUT_STS 0x2002
47 #define CPHY_SATA_OVERRIDE 0x4000
48 #define CPHY_OVERRIDE 0x2005
49 #define SPHY_LANE 0x100
50 #define SPHY_HALF_RATE 0x0001
51 #define CPHY_SATA_DPLL_MODE 0x0700
52 #define CPHY_SATA_DPLL_SHIFT 8
53 #define CPHY_SATA_DPLL_RESET (1 << 11)
54 #define CPHY_PHY_COUNT 6
55 #define CPHY_LANE_COUNT 4
56 #define CPHY_PORT_COUNT (CPHY_PHY_COUNT * CPHY_LANE_COUNT)
58 static DEFINE_SPINLOCK(cphy_lock);
59 /* Each of the 6 phys can have up to 4 sata ports attached to i. Map 0-based
60 * sata ports to their phys and then to their lanes within the phys
62 struct phy_lane_info {
63 void __iomem *phy_base;
67 static struct phy_lane_info port_data[CPHY_PORT_COUNT];
69 static u32 __combo_phy_reg_read(u8 sata_port, u32 addr)
72 u8 dev = port_data[sata_port].phy_devs;
73 spin_lock(&cphy_lock);
74 writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
75 data = readl(port_data[sata_port].phy_base + CPHY_ADDR(addr));
76 spin_unlock(&cphy_lock);
80 static void __combo_phy_reg_write(u8 sata_port, u32 addr, u32 data)
82 u8 dev = port_data[sata_port].phy_devs;
83 spin_lock(&cphy_lock);
84 writel(CPHY_MAP(dev, addr), port_data[sata_port].phy_base + 0x800);
85 writel(data, port_data[sata_port].phy_base + CPHY_ADDR(addr));
86 spin_unlock(&cphy_lock);
89 static void combo_phy_wait_for_ready(u8 sata_port)
91 while (__combo_phy_reg_read(sata_port, SERDES_CR_CTL) & CR_BUSY)
95 static u32 combo_phy_read(u8 sata_port, u32 addr)
97 combo_phy_wait_for_ready(sata_port);
98 __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
99 __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_START);
100 combo_phy_wait_for_ready(sata_port);
101 return __combo_phy_reg_read(sata_port, SERDES_CR_DATA);
104 static void combo_phy_write(u8 sata_port, u32 addr, u32 data)
106 combo_phy_wait_for_ready(sata_port);
107 __combo_phy_reg_write(sata_port, SERDES_CR_ADDR, addr);
108 __combo_phy_reg_write(sata_port, SERDES_CR_DATA, data);
109 __combo_phy_reg_write(sata_port, SERDES_CR_CTL, CR_WR_RDN | CR_START);
112 static void highbank_cphy_disable_overrides(u8 sata_port)
114 u8 lane = port_data[sata_port].lane_mapping;
116 if (unlikely(port_data[sata_port].phy_base == NULL))
118 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
119 tmp &= ~CPHY_SATA_OVERRIDE;
120 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
123 static void cphy_override_rx_mode(u8 sata_port, u32 val)
125 u8 lane = port_data[sata_port].lane_mapping;
127 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS + lane * SPHY_LANE);
128 tmp &= ~CPHY_SATA_OVERRIDE;
129 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
131 tmp |= CPHY_SATA_OVERRIDE;
132 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
134 tmp &= ~CPHY_SATA_DPLL_MODE;
135 tmp |= val << CPHY_SATA_DPLL_SHIFT;
136 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
138 tmp |= CPHY_SATA_DPLL_RESET;
139 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
141 tmp &= ~CPHY_SATA_DPLL_RESET;
142 combo_phy_write(sata_port, CPHY_OVERRIDE + lane * SPHY_LANE, tmp);
147 static void highbank_cphy_override_lane(u8 sata_port)
149 u8 lane = port_data[sata_port].lane_mapping;
152 if (unlikely(port_data[sata_port].phy_base == NULL))
155 tmp = combo_phy_read(sata_port, CPHY_RX_INPUT_STS +
157 } while ((tmp & SPHY_HALF_RATE) && (k++ < 1000));
158 cphy_override_rx_mode(sata_port, 3);
161 static int highbank_initialize_phys(struct device *dev, void __iomem *addr)
163 struct device_node *sata_node = dev->of_node;
164 int phy_count = 0, phy, port = 0;
165 void __iomem *cphy_base[CPHY_PHY_COUNT];
166 struct device_node *phy_nodes[CPHY_PHY_COUNT];
167 memset(port_data, 0, sizeof(struct phy_lane_info) * CPHY_PORT_COUNT);
168 memset(phy_nodes, 0, sizeof(struct device_node*) * CPHY_PHY_COUNT);
172 struct of_phandle_args phy_data;
173 if (of_parse_phandle_with_args(sata_node,
174 "calxeda,port-phys", "#phy-cells",
177 for (phy = 0; phy < phy_count; phy++) {
178 if (phy_nodes[phy] == phy_data.np)
181 if (phy_nodes[phy] == NULL) {
182 phy_nodes[phy] = phy_data.np;
183 cphy_base[phy] = of_iomap(phy_nodes[phy], 0);
184 if (cphy_base[phy] == NULL) {
189 port_data[port].lane_mapping = phy_data.args[0];
190 of_property_read_u32(phy_nodes[phy], "phydev", &tmp);
191 port_data[port].phy_devs = tmp;
192 port_data[port].phy_base = cphy_base[phy];
193 of_node_put(phy_data.np);
195 } while (port < CPHY_PORT_COUNT);
199 static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
200 unsigned long deadline)
202 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
203 struct ata_port *ap = link->ap;
204 struct ahci_port_priv *pp = ap->private_data;
205 u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
206 struct ata_taskfile tf;
212 ahci_stop_engine(ap);
214 /* clear D2H reception area to properly wait for D2H FIS */
215 ata_tf_init(link->device, &tf);
216 tf.command = ATA_BUSY;
217 ata_tf_to_fis(&tf, 0, 0, d2h_fis);
220 highbank_cphy_disable_overrides(link->ap->port_no);
221 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
222 highbank_cphy_override_lane(link->ap->port_no);
224 /* If the status is 1, we are connected, but the link did not
225 * come up. So retry resetting the link again.
227 if (sata_scr_read(link, SCR_STATUS, &sstatus))
229 if (!(sstatus & 0x3))
231 } while (!online && retry--);
233 ahci_start_engine(ap);
236 *class = ahci_dev_classify(ap);
241 static struct ata_port_operations ahci_highbank_ops = {
242 .inherits = &ahci_ops,
243 .hardreset = ahci_highbank_hardreset,
246 static const struct ata_port_info ahci_highbank_port_info = {
247 .flags = AHCI_FLAG_COMMON,
248 .pio_mask = ATA_PIO4,
249 .udma_mask = ATA_UDMA6,
250 .port_ops = &ahci_highbank_ops,
253 static struct scsi_host_template ahci_highbank_platform_sht = {
254 AHCI_SHT("sata_highbank"),
257 static const struct of_device_id ahci_of_match[] = {
258 { .compatible = "calxeda,hb-ahci" },
261 MODULE_DEVICE_TABLE(of, ahci_of_match);
263 static int ahci_highbank_probe(struct platform_device *pdev)
265 struct device *dev = &pdev->dev;
266 struct ahci_host_priv *hpriv;
267 struct ata_host *host;
268 struct resource *mem;
273 struct ata_port_info pi = ahci_highbank_port_info;
274 const struct ata_port_info *ppi[] = { &pi, NULL };
276 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
278 dev_err(dev, "no mmio space\n");
282 irq = platform_get_irq(pdev, 0);
284 dev_err(dev, "no irq\n");
288 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
290 dev_err(dev, "can't alloc ahci_host_priv\n");
294 hpriv->flags |= (unsigned long)pi.private_data;
296 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
298 dev_err(dev, "can't map %pR\n", mem);
302 rc = highbank_initialize_phys(dev, hpriv->mmio);
307 ahci_save_initial_config(dev, hpriv, 0, 0);
310 if (hpriv->cap & HOST_CAP_NCQ)
311 pi.flags |= ATA_FLAG_NCQ;
313 if (hpriv->cap & HOST_CAP_PMP)
314 pi.flags |= ATA_FLAG_PMP;
316 ahci_set_em_messages(hpriv, &pi);
318 /* CAP.NP sometimes indicate the index of the last enabled
319 * port, at other times, that of the last possible port, so
320 * determining the maximum port number requires looking at
321 * both CAP.NP and port_map.
323 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
325 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
331 host->private_data = hpriv;
333 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
334 host->flags |= ATA_HOST_PARALLEL_SCAN;
336 if (pi.flags & ATA_FLAG_EM)
339 for (i = 0; i < host->n_ports; i++) {
340 struct ata_port *ap = host->ports[i];
342 ata_port_desc(ap, "mmio %pR", mem);
343 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
345 /* set enclosure management message type */
346 if (ap->flags & ATA_FLAG_EM)
347 ap->em_message_type = hpriv->em_msg_type;
349 /* disabled/not-implemented port */
350 if (!(hpriv->port_map & (1 << i)))
351 ap->ops = &ata_dummy_port_ops;
354 rc = ahci_reset_controller(host);
358 ahci_init_controller(host);
359 ahci_print_info(host, "platform");
361 rc = ata_host_activate(host, irq, ahci_interrupt, 0,
362 &ahci_highbank_platform_sht);
371 #ifdef CONFIG_PM_SLEEP
372 static int ahci_highbank_suspend(struct device *dev)
374 struct ata_host *host = dev_get_drvdata(dev);
375 struct ahci_host_priv *hpriv = host->private_data;
376 void __iomem *mmio = hpriv->mmio;
380 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
381 dev_err(dev, "firmware update required for suspend/resume\n");
386 * AHCI spec rev1.1 section 8.3.3:
387 * Software must disable interrupts prior to requesting a
388 * transition of the HBA to D3 state.
390 ctl = readl(mmio + HOST_CTL);
392 writel(ctl, mmio + HOST_CTL);
393 readl(mmio + HOST_CTL); /* flush */
395 rc = ata_host_suspend(host, PMSG_SUSPEND);
402 static int ahci_highbank_resume(struct device *dev)
404 struct ata_host *host = dev_get_drvdata(dev);
407 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
408 rc = ahci_reset_controller(host);
412 ahci_init_controller(host);
415 ata_host_resume(host);
421 static SIMPLE_DEV_PM_OPS(ahci_highbank_pm_ops,
422 ahci_highbank_suspend, ahci_highbank_resume);
424 static struct platform_driver ahci_highbank_driver = {
425 .remove = ata_platform_remove_one,
427 .name = "highbank-ahci",
428 .owner = THIS_MODULE,
429 .of_match_table = ahci_of_match,
430 .pm = &ahci_highbank_pm_ops,
432 .probe = ahci_highbank_probe,
435 module_platform_driver(ahci_highbank_driver);
437 MODULE_DESCRIPTION("Calxeda Highbank AHCI SATA platform driver");
438 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@calxeda.com>");
439 MODULE_LICENSE("GPL");
440 MODULE_ALIAS("sata:highbank");