[PATCH v2 5/6] DRIVERS: ATA: SATA controller driver
Vasanth Ananthan
vasanthananthan at gmail.com
Tue Oct 30 12:01:36 EDT 2012
This patch adds a platform driver for SATA controller.
Signed-off-by: Vasanth Ananthan <vasanth.a at samsung.com>
---
arch/arm/mach-exynos/include/mach/regs-pmu.h | 3 +
drivers/ata/Kconfig | 12 ++
drivers/ata/Makefile | 1 +
drivers/ata/sata_exynos.c | 268 ++++++++++++++++++++++++++
4 files changed, 284 insertions(+), 0 deletions(-)
create mode 100644 drivers/ata/sata_exynos.c
diff --git a/arch/arm/mach-exynos/include/mach/regs-pmu.h b/arch/arm/mach-exynos/include/mach/regs-pmu.h
index d4e392b..3716ce8 100644
--- a/arch/arm/mach-exynos/include/mach/regs-pmu.h
+++ b/arch/arm/mach-exynos/include/mach/regs-pmu.h
@@ -367,4 +367,7 @@
#define EXYNOS5_OPTION_USE_RETENTION (1 << 4)
+/* Only for EXYNOS5250 */
+#define EXYNOS5_SATA_PHY_CONTROL S5P_PMUREG(0x0724)
+
#endif /* __ASM_ARCH_REGS_PMU_H */
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index e3a2972..f3384ed 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -93,6 +93,18 @@ config SATA_PHY
with the framework through the APIs provided and the SATA
device finds and requests for an appropriate PHY device.
+config SATA_EXYNOS
+ bool "Exynos SATA AHCI support"
+ select I2C
+ select HAVE_S3C2410_I2C
+ select I2C_S3C2410
+ select SATA_PHY
+ help
+ This option enables support for Exynos AHCI Serial ATA
+ controllers.
+
+ If unsure, say N.
+
config SATA_FSL
tristate "Freescale 3.0Gbps SATA support"
depends on FSL_SOC
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 3d219a9..43bb38e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_SATA_SIL24) += sata_sil24.o
obj-$(CONFIG_SATA_DWC) += sata_dwc_460ex.o
obj-$(CONFIG_SATA_HIGHBANK) += sata_highbank.o libahci.o
obj-$(CONFIG_SATA_PHY) += sata_phy.o
+obj-$(CONFIG_SATA_EXYNOS) += sata_exynos.o libahci.o
# SFF w/ custom DMA
obj-$(CONFIG_PDC_ADMA) += pdc_adma.o
diff --git a/drivers/ata/sata_exynos.c b/drivers/ata/sata_exynos.c
new file mode 100644
index 0000000..41dc17d
--- /dev/null
+++ b/drivers/ata/sata_exynos.c
@@ -0,0 +1,268 @@
+/*
+ * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * EXYNOS - SATA controller driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include "ahci.h"
+#include "sata_phy.h"
+
+#define MHZ (1000 * 1000)
+
+static const struct ata_port_info ahci_port_info = {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_ops,
+};
+
+static struct scsi_host_template ahci_platform_sht = {
+ AHCI_SHT("ahci_platform"),
+};
+
+struct exynos_sata {
+ struct clk *sclk;
+ struct clk *clk;
+ struct sata_phy *phy;
+ int irq;
+ unsigned int freq;
+};
+
+static void exynos_sata_parse_dt(struct device_node *np,
+ struct exynos_sata *sata)
+{
+ if (!np)
+ return;
+
+ of_property_read_u32(np, "samsung,sata-freq", &sata->freq);
+}
+
+static int __init exynos_sata_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ata_port_info pi = ahci_port_info;
+ const struct ata_port_info *ppi[] = { &pi, NULL };
+ struct ahci_host_priv *hpriv;
+ struct exynos_sata *sata;
+ struct ata_host *host;
+ struct resource *mem;
+ int n_ports, i, ret;
+
+ sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
+ if (!sata) {
+ dev_err(dev, "can't alloc sata\n");
+ return -EINVAL;
+ }
+
+ hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv) {
+ dev_err(dev, "can't alloc ahci_host_priv\n");
+ ret = -ENOMEM;
+ goto err1;
+ }
+
+ hpriv->flags |= (unsigned long)pi.private_data;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(dev, "no mmio space\n");
+ ret = -EINVAL;
+ goto err2;
+ }
+
+ sata->irq = platform_get_irq(pdev, 0);
+ if (sata->irq <= 0) {
+ dev_err(dev, "no irq\n");
+ ret = -EINVAL;
+ goto err2;
+ }
+
+ hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
+ if (!hpriv->mmio) {
+ dev_err(dev, "can't map %pR\n", mem);
+ ret = -ENOMEM;
+ goto err2;
+ }
+
+ exynos_sata_parse_dt(dev->of_node, sata);
+
+ sata->sclk = devm_clk_get(dev, "sclk_sata");
+ if (IS_ERR(sata->sclk)) {
+ dev_err(dev, "failed to get sclk_sata\n");
+ ret = PTR_ERR(sata->sclk);
+ goto err3;
+ }
+ clk_enable(sata->sclk);
+
+ clk_set_rate(sata->sclk, sata->freq * MHZ);
+
+ sata->clk = devm_clk_get(dev, "sata");
+ if (IS_ERR(sata->clk)) {
+ dev_err(dev, "failed to get sata clock\n");
+ ret = PTR_ERR(sata->clk);
+ goto err4;
+ }
+ clk_enable(sata->clk);
+
+ /* Get a gen 3 PHY controller */
+
+ sata->phy = sata_get_phy(SATA_PHY_GENERATION3);
+ if (!sata->phy) {
+ dev_err(dev, "failed to get sata phy\n");
+ ret = -EPROBE_DEFER;
+ goto err5;
+ }
+
+ /* Initialize the controller */
+
+ ret = sata_init_phy(sata->phy);
+ if (ret < 0) {
+ dev_err(dev, "failed to initialize sata phy\n");
+ goto err6;
+ }
+
+ ahci_save_initial_config(dev, hpriv, 0, 0);
+
+ /* prepare host */
+ if (hpriv->cap & HOST_CAP_NCQ)
+ pi.flags |= ATA_FLAG_NCQ;
+
+ if (hpriv->cap & HOST_CAP_PMP)
+ pi.flags |= ATA_FLAG_PMP;
+
+ ahci_set_em_messages(hpriv, &pi);
+
+ /* CAP.NP sometimes indicate the index of the last enabled
+ * port, at other times, that of the last possible port, so
+ * determining the maximum port number requires looking at
+ * both CAP.NP and port_map.
+ */
+ n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
+
+ host = ata_host_alloc_pinfo(dev, ppi, n_ports);
+ if (!host) {
+ ret = -ENOMEM;
+ goto err7;
+ }
+
+ host->private_data = hpriv;
+
+ if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
+ host->flags |= ATA_HOST_PARALLEL_SCAN;
+ else
+ pr_info(KERN_INFO
+ "ahci: SSS flag set, parallel bus scan disabled\n");
+
+ if (pi.flags & ATA_FLAG_EM)
+ ahci_reset_em(host);
+
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap = host->ports[i];
+
+ ata_port_desc(ap, "mmio %pR", mem);
+ ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
+
+ /* set enclosure management message type */
+ if (ap->flags & ATA_FLAG_EM)
+ ap->em_message_type = hpriv->em_msg_type;
+
+ /* disabled/not-implemented port */
+ if (!(hpriv->port_map & (1 << i)))
+ ap->ops = &ata_dummy_port_ops;
+ }
+
+ ret = ahci_reset_controller(host);
+ if (ret)
+ goto err7;
+
+ ahci_init_controller(host);
+ ahci_print_info(host, "platform");
+
+ ret = ata_host_activate(host, sata->irq, ahci_interrupt, IRQF_SHARED,
+ &ahci_platform_sht);
+ if (ret)
+ goto err7;
+
+ platform_set_drvdata(pdev, sata);
+
+ return 0;
+
+ err7:
+ sata_shutdown_phy(sata->phy);
+
+ err6:
+ sata_put_phy(sata->phy);
+
+ err5:
+ clk_disable(sata->clk);
+ devm_clk_put(dev, sata->clk);
+
+ err4:
+ clk_disable(sata->sclk);
+ devm_clk_put(dev, sata->sclk);
+
+ err3:
+ devm_iounmap(dev, hpriv->mmio);
+
+ err2:
+ devm_kfree(dev, hpriv);
+
+ err1:
+ devm_kfree(dev, sata);
+
+ return ret;
+}
+
+static int __devexit exynos_sata_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct exynos_sata *sata = platform_get_drvdata(pdev);
+
+ ata_host_detach(host);
+
+ sata_shutdown_phy(sata->phy);
+ sata_put_phy(sata->phy);
+
+ return 0;
+}
+
+static const struct of_device_id ahci_of_match[] = {
+ { .compatible = "samsung,exynos5-sata-ahci", },
+};
+
+MODULE_DEVICE_TABLE(of, ahci_of_match);
+
+static struct platform_driver exynos_sata_driver = {
+ .probe = exynos_sata_probe,
+ .remove = exynos_sata_remove,
+ .driver = {
+ .name = "ahci-sata",
+ .owner = THIS_MODULE,
+ .of_match_table = ahci_of_match,
+ },
+};
+
+module_platform_driver(exynos_sata_driver);
+
+MODULE_DESCRIPTION("EXYNOS SATA DRIVER");
+MODULE_AUTHOR("Vasanth Ananthan, <vasanth.a at samsung.com>");
+MODULE_LICENSE("GPL");
--
1.7.4.1
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