diff options
Diffstat (limited to 'target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c')
| -rw-r--r-- | target/linux/oxnas/files/drivers/usb/host/ehci-oxnas.c | 368 |
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"); |