oxnas: bring in new oxnas target

Reboot the oxnas target based on Linux 4.14 by rebasing our support on
top of the now-existing upstream kernel support.
This commit brings oxnas support to the level of v4.17 having upstream
drivers for Ethernet, Serial and NAND flash.
Botch up OpenWrt's local drivers for EHCI, SATA and PCIe based on the
new platform code and device-tree.
Re-introduce base-files from old oxnas target which works for now but
needs further clean-up towards generic board support.

Functional issues:
 * PCIe won't come up (hence no USB3 on Shuttle KD20)
 * I2C bus of Akitio myCloud device is likely not to work (missing
   debounce support in new pinctrl driver)

Code-style issues:
 * plla/pllb needs further cleanup -- currently their users or writing
   into the syscon regmap after acquireling the clk instead of using
   defined clk_*_*() functions to setup multipliers and dividors.
 * PCIe phy needs its own little driver.
 * SATA driver is a monster and should be split into an mfd having
   a raidctrl regmap, sata controller, sata ports and sata phy.

Tested on MitraStar STG-212 aka. Medion Akoya MD86xxx and Shuttle KD20.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 368 insertions, 0 deletions

diff --git a/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c b/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c
new file mode 100644
index 0000000000..79c4fa3a95
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c
@@ -0,0 +1,368 @@
+/*
+ * drivers/usb/host/ehci-oxnas.c
+ *
+ * Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#define USBHSMPH_CTRL_REGOFFSET		0x40
+#define USBHSMPH_STAT_REGOFFSET		0x44
+#define REF300_DIV_REGOFFSET		0xF8
+#define USBHSPHY_CTRL_REGOFFSET		0x84
+#define USB_CTRL_REGOFFSET		0x90
+#define PLLB_DIV_CTRL_REGOFFSET		0x1000F8
+#define USBHSPHY_SUSPENDM_MANUAL_ENABLE		16
+#define USBHSPHY_SUSPENDM_MANUAL_STATE		15
+#define USBHSPHY_ATE_ESET			14
+#define USBHSPHY_TEST_DIN			6
+#define USBHSPHY_TEST_ADD			2
+#define USBHSPHY_TEST_DOUT_SEL			1
+#define USBHSPHY_TEST_CLK			0
+
+#define USB_CTRL_USBAPHY_CKSEL_SHIFT	5
+#define USB_CLK_XTAL0_XTAL1		(0 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_XTAL0			(1 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+#define USB_CLK_INTERNAL		(2 << USB_CTRL_USBAPHY_CKSEL_SHIFT)
+
+#define USBAMUX_DEVICE			BIT(4)
+
+#define USBPHY_REFCLKDIV_SHIFT		2
+#define USB_PHY_REF_12MHZ		(0 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_24MHZ		(1 << USBPHY_REFCLKDIV_SHIFT)
+#define USB_PHY_REF_48MHZ		(2 << USBPHY_REFCLKDIV_SHIFT)
+
+#define USB_CTRL_USB_CKO_SEL_BIT	0
+
+#define USB_INT_CLK_XTAL		0
+#define USB_INT_CLK_REF300		2
+#define USB_INT_CLK_PLLB		3
+
+#define REF300_DIV_INT_SHIFT            8
+#define REF300_DIV_FRAC_SHIFT           0
+#define REF300_DIV_INT(val)             ((val) << REF300_DIV_INT_SHIFT)
+#define REF300_DIV_FRAC(val)            ((val) << REF300_DIV_FRAC_SHIFT)
+
+#define PLLB_BYPASS                     1
+#define PLLB_ENSAT                      3
+#define PLLB_OUTDIV                     4
+#define PLLB_REFDIV                     8
+#define PLLB_DIV_INT_SHIFT              8
+#define PLLB_DIV_FRAC_SHIFT             0
+#define PLLB_DIV_INT(val)               ((val) << PLLB_DIV_INT_SHIFT)
+#define PLLB_DIV_FRAC(val)              ((val) << PLLB_DIV_FRAC_SHIFT)
+
+#include "ehci.h"
+
+struct oxnas_hcd {
+	struct clk *clk;
+	struct clk *refsrc;
+	struct clk *phyref;
+	int use_pllb;
+	int use_phya;
+	struct reset_control *rst_host;
+	struct reset_control *rst_phya;
+	struct reset_control *rst_phyb;
+	struct regmap *syscon;
+};
+
+#define DRIVER_DESC "Oxnas On-Chip EHCI Host Controller"
+
+static struct hc_driver __read_mostly oxnas_hc_driver;
+
+static void start_oxnas_usb_ehci(struct oxnas_hcd *oxnas)
+{
+	if (oxnas->use_pllb) {
+		/* enable pllb */
+		clk_prepare_enable(oxnas->refsrc);
+		/* enable ref600 */
+		clk_prepare_enable(oxnas->phyref);
+		/* 600MHz pllb divider for 12MHz */
+		regmap_write_bits(oxnas->syscon, PLLB_DIV_CTRL_REGOFFSET, 0xffff, PLLB_DIV_INT(50) | PLLB_DIV_FRAC(0));
+	} else {
+		/* ref 300 divider for 12MHz */
+		regmap_write_bits(oxnas->syscon, REF300_DIV_REGOFFSET, 0xffff, REF300_DIV_INT(25) | REF300_DIV_FRAC(0));
+	}
+
+	/* Ensure the USB block is properly reset */
+	reset_control_reset(oxnas->rst_host);
+	reset_control_reset(oxnas->rst_phya);
+	reset_control_reset(oxnas->rst_phyb);
+
+	/* Force the high speed clock to be generated all the time, via serial
+	 programming of the USB HS PHY */
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (2UL << USBHSPHY_TEST_ADD) |
+			  (0xe0UL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (1UL << USBHSPHY_TEST_CLK) |
+			  (2UL << USBHSPHY_TEST_ADD) |
+			  (0xe0UL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (0xfUL << USBHSPHY_TEST_ADD) |
+			  (0xaaUL << USBHSPHY_TEST_DIN));
+
+	regmap_write_bits(oxnas->syscon, USBHSPHY_CTRL_REGOFFSET, 0xffff,
+			  (1UL << USBHSPHY_TEST_CLK) |
+			  (0xfUL << USBHSPHY_TEST_ADD) |
+			  (0xaaUL << USBHSPHY_TEST_DIN));
+
+	if (oxnas->use_pllb) /* use pllb clock */
+		regmap_write_bits(oxnas->syscon, USB_CTRL_REGOFFSET, 0xffff,
+				  USB_CLK_INTERNAL | USB_INT_CLK_PLLB);
+	else /* use ref300 derived clock */
+		regmap_write_bits(oxnas->syscon, USB_CTRL_REGOFFSET, 0xffff,
+				  USB_CLK_INTERNAL | USB_INT_CLK_REF300);
+
+	if (oxnas->use_phya) {
+		/* Configure USB PHYA as a host */
+		regmap_update_bits(oxnas->syscon, USB_CTRL_REGOFFSET, USBAMUX_DEVICE, 0);
+	}
+
+	/* Enable the clock to the USB block */
+	clk_prepare_enable(oxnas->clk);
+}
+
+static void stop_oxnas_usb_ehci(struct oxnas_hcd *oxnas)
+{
+	reset_control_assert(oxnas->rst_host);
+	reset_control_assert(oxnas->rst_phya);
+	reset_control_assert(oxnas->rst_phyb);
+
+	if (oxnas->use_pllb) {
+		clk_disable_unprepare(oxnas->phyref);
+		clk_disable_unprepare(oxnas->refsrc);
+	}
+	clk_disable_unprepare(oxnas->clk);
+}
+
+static int ehci_oxnas_reset(struct usb_hcd *hcd)
+{
+	#define  txttfill_tuning	reserved2[0]
+
+	struct ehci_hcd	*ehci;
+	u32 tmp;
+	int retval = ehci_setup(hcd);
+	if (retval)
+		return retval;
+
+	ehci = hcd_to_ehci(hcd);
+	tmp = ehci_readl(ehci, &ehci->regs->txfill_tuning);
+	tmp &= ~0x00ff0000;
+	tmp |= 0x003f0000; /* set burst pre load count to 0x40 (63 * 4 bytes)  */
+	tmp |= 0x16; /* set sheduler overhead to 22 * 1.267us (HS) or 22 * 6.33us (FS/LS)*/
+	ehci_writel(ehci, tmp,  &ehci->regs->txfill_tuning);
+
+	tmp = ehci_readl(ehci, &ehci->regs->txttfill_tuning);
+	tmp |= 0x2; /* set sheduler overhead to 2 * 6.333us */
+	ehci_writel(ehci, tmp,  &ehci->regs->txttfill_tuning);
+
+	return retval;
+}
+
+static int ehci_oxnas_drv_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct resource res;
+	struct oxnas_hcd *oxnas;
+	int irq, err;
+	struct reset_control *rstc;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	if (!ofdev->dev.dma_mask)
+		ofdev->dev.dma_mask = &ofdev->dev.coherent_dma_mask;
+	if (!ofdev->dev.coherent_dma_mask)
+		ofdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	hcd = usb_create_hcd(&oxnas_hc_driver,	&ofdev->dev,
+					dev_name(&ofdev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	err = of_address_to_resource(np, 0, &res);
+	if (err)
+		goto err_res;
+
+	hcd->rsrc_start = res.start;
+	hcd->rsrc_len = resource_size(&res);
+
+	hcd->regs = devm_ioremap_resource(&ofdev->dev, &res);
+	if (IS_ERR(hcd->regs)) {
+		dev_err(&ofdev->dev, "devm_ioremap_resource failed\n");
+		err = PTR_ERR(hcd->regs);
+		goto err_ioremap;
+	}
+
+	oxnas = (struct oxnas_hcd *)hcd_to_ehci(hcd)->priv;
+
+	oxnas->use_pllb = of_property_read_bool(np, "oxsemi,ehci_use_pllb");
+	oxnas->use_phya = of_property_read_bool(np, "oxsemi,ehci_use_phya");
+
+	oxnas->syscon = syscon_regmap_lookup_by_phandle(np, "oxsemi,sys-ctrl");
+	if (IS_ERR(oxnas->syscon)) {
+		err = PTR_ERR(oxnas->syscon);
+		goto err_syscon;
+	}
+
+	oxnas->clk = of_clk_get_by_name(np, "usb");
+	if (IS_ERR(oxnas->clk)) {
+		err = PTR_ERR(oxnas->clk);
+		goto err_clk;
+	}
+
+	if (oxnas->use_pllb) {
+		oxnas->refsrc = of_clk_get_by_name(np, "refsrc");
+		if (IS_ERR(oxnas->refsrc)) {
+			err = PTR_ERR(oxnas->refsrc);
+			goto err_refsrc;
+		}
+		oxnas->phyref = of_clk_get_by_name(np, "phyref");
+		if (IS_ERR(oxnas->refsrc)) {
+			err = PTR_ERR(oxnas->refsrc);
+			goto err_phyref;
+		}
+
+	} else {
+		oxnas->refsrc = NULL;
+		oxnas->phyref = NULL;
+	}
+
+	rstc = devm_reset_control_get(&ofdev->dev, "host");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_host = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "phya");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_phya = rstc;
+
+	rstc = devm_reset_control_get(&ofdev->dev, "phyb");
+	if (IS_ERR(rstc)) {
+		err = PTR_ERR(rstc);
+		goto err_rst;
+	}
+	oxnas->rst_phyb = rstc;
+
+	irq = irq_of_parse_and_map(np, 0);
+	if (!irq) {
+		dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
+		err = -EBUSY;
+		goto err_irq;
+	}
+
+	hcd->has_tt = 1;
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = hcd->regs;
+
+	start_oxnas_usb_ehci(oxnas);
+
+	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (err)
+		goto err_hcd;
+
+	return 0;
+
+err_hcd:
+	stop_oxnas_usb_ehci(oxnas);
+err_irq:
+err_rst:
+	if (oxnas->phyref)
+		clk_put(oxnas->phyref);
+err_phyref:
+	if (oxnas->refsrc)
+		clk_put(oxnas->refsrc);
+err_refsrc:
+	clk_put(oxnas->clk);
+err_syscon:
+err_clk:
+err_ioremap:
+err_res:
+	usb_put_hcd(hcd);
+
+	return err;
+}
+
+static int ehci_oxnas_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct oxnas_hcd *oxnas = (struct oxnas_hcd *)hcd_to_ehci(hcd)->priv;
+
+	usb_remove_hcd(hcd);
+	if (oxnas->use_pllb) {
+		clk_disable_unprepare(oxnas->phyref);
+		clk_put(oxnas->phyref);
+		clk_disable_unprepare(oxnas->refsrc);
+		clk_put(oxnas->refsrc);
+	}
+	clk_disable_unprepare(oxnas->clk);
+	usb_put_hcd(hcd);
+
+	return 0;
+}
+
+static const struct of_device_id oxnas_ehci_dt_ids[] = {
+	{ .compatible = "plxtech,nas782x-ehci" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, oxnas_ehci_dt_ids);
+
+static struct platform_driver ehci_oxnas_driver = {
+	.probe		= ehci_oxnas_drv_probe,
+	.remove		= ehci_oxnas_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver.name	= "oxnas-ehci",
+	.driver.of_match_table	= oxnas_ehci_dt_ids,
+};
+
+static const struct ehci_driver_overrides oxnas_overrides __initconst = {
+	.reset = ehci_oxnas_reset,
+	.extra_priv_size = sizeof(struct oxnas_hcd),
+};
+
+static int __init ehci_oxnas_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	ehci_init_driver(&oxnas_hc_driver, &oxnas_overrides);
+	return platform_driver_register(&ehci_oxnas_driver);
+}
+module_init(ehci_oxnas_init);
+
+static void __exit ehci_oxnas_cleanup(void)
+{
+	platform_driver_unregister(&ehci_oxnas_driver);
+}
+module_exit(ehci_oxnas_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:oxnas-ehci");
+MODULE_LICENSE("GPL");