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linux_dsm_epyc7002/drivers/usb/host/ehci-pxa168.c
Tanmay Upadhyay 3abd7f68b2 USB: pxa168: Add onchip USB host controller support 
- Add EHCI Host controller driver
- Add wrapper that creates resources for host controller driver

v2 - Call clk_put() after clk_disable() in probe function

Signed-off-by: Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-08-22 15:38:30 -07:00

364 lines
8.7 KiB
C
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/*
* drivers/usb/host/ehci-pxa168.c
*
* Tanmay Upadhyay <tanmay.upadhyay@einfochips.com>
*
* Based on drivers/usb/host/ehci-orion.c
*
* 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/clk.h>
#include <mach/pxa168.h>
#define USB_PHY_CTRL_REG 0x4
#define USB_PHY_PLL_REG 0x8
#define USB_PHY_TX_REG 0xc
#define FBDIV_SHIFT 4
#define ICP_SHIFT 12
#define ICP_15 2
#define ICP_20 3
#define ICP_25 4
#define KVCO_SHIFT 15
#define PLLCALI12_SHIFT 25
#define CALI12_VDD 0
#define CALI12_09 1
#define CALI12_10 2
#define CALI12_11 3
#define PLLVDD12_SHIFT 27
#define VDD12_VDD 0
#define VDD12_10 1
#define VDD12_11 2
#define VDD12_12 3
#define PLLVDD18_SHIFT 29
#define VDD18_19 0
#define VDD18_20 1
#define VDD18_21 2
#define VDD18_22 3
#define PLL_READY (1 << 23)
#define VCOCAL_START (1 << 21)
#define REG_RCAL_START (1 << 12)
struct pxa168_usb_drv_data {
struct ehci_hcd ehci;
struct clk *pxa168_usb_clk;
struct resource *usb_phy_res;
void __iomem *usb_phy_reg_base;
};
static int ehci_pxa168_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
ehci_reset(ehci);
retval = ehci_halt(ehci);
if (retval)
return retval;
/*
* data structure init
*/
retval = ehci_init(hcd);
if (retval)
return retval;
hcd->has_tt = 1;
ehci_port_power(ehci, 0);
return retval;
}
static const struct hc_driver ehci_pxa168_hc_driver = {
.description = hcd_name,
.product_desc = "Marvell PXA168 EHCI",
.hcd_priv_size = sizeof(struct pxa168_usb_drv_data),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_pxa168_setup,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int pxa168_usb_phy_init(struct platform_device *pdev)
{
struct resource *res;
void __iomem *usb_phy_reg_base;
struct pxa168_usb_pdata *pdata;
struct pxa168_usb_drv_data *drv_data;
struct usb_hcd *hcd = platform_get_drvdata(pdev);
unsigned long reg_val;
int pll_retry_cont = 10000, err = 0;
drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
pdata = (struct pxa168_usb_pdata *)pdev->dev.platform_data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev,
"Found HC with no PHY register addr. Check %s setup!\n",
dev_name(&pdev->dev));
return -ENODEV;
}
if (!request_mem_region(res->start, resource_size(res),
ehci_pxa168_hc_driver.description)) {
dev_dbg(&pdev->dev, "controller already in use\n");
return -EBUSY;
}
usb_phy_reg_base = ioremap(res->start, resource_size(res));
if (usb_phy_reg_base == NULL) {
dev_dbg(&pdev->dev, "error mapping memory\n");
err = -EFAULT;
goto err1;
}
drv_data->usb_phy_reg_base = usb_phy_reg_base;
drv_data->usb_phy_res = res;
/* If someone wants to init USB phy in board specific way */
if (pdata && pdata->phy_init)
return pdata->phy_init(usb_phy_reg_base);
/* Power up the PHY and PLL */
writel(readl(usb_phy_reg_base + USB_PHY_CTRL_REG) | 0x3,
usb_phy_reg_base + USB_PHY_CTRL_REG);
/* Configure PHY PLL */
reg_val = readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~(0x7e03ffff);
reg_val |= (VDD18_22 << PLLVDD18_SHIFT | VDD12_12 << PLLVDD12_SHIFT |
CALI12_11 << PLLCALI12_SHIFT | 3 << KVCO_SHIFT |
ICP_15 << ICP_SHIFT | 0xee << FBDIV_SHIFT | 0xb);
writel(reg_val, usb_phy_reg_base + USB_PHY_PLL_REG);
/* Make sure PHY PLL is ready */
while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
if (!(pll_retry_cont--)) {
dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
err = -EIO;
goto err2;
}
}
/* Toggle VCOCAL_START bit of U2PLL for PLL calibration */
udelay(200);
writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) | VCOCAL_START,
usb_phy_reg_base + USB_PHY_PLL_REG);
udelay(40);
writel(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & ~VCOCAL_START,
usb_phy_reg_base + USB_PHY_PLL_REG);
/* Toggle REG_RCAL_START bit of U2PTX for impedance calibration */
udelay(400);
writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) | REG_RCAL_START,
usb_phy_reg_base + USB_PHY_TX_REG);
udelay(40);
writel(readl(usb_phy_reg_base + USB_PHY_TX_REG) & ~REG_RCAL_START,
usb_phy_reg_base + USB_PHY_TX_REG);
/* Make sure PHY PLL is ready again */
pll_retry_cont = 0;
while (!(readl(usb_phy_reg_base + USB_PHY_PLL_REG) & PLL_READY)) {
if (!(pll_retry_cont--)) {
dev_dbg(&pdev->dev, "USB PHY PLL not ready\n");
err = -EIO;
goto err2;
}
}
return 0;
err2:
iounmap(usb_phy_reg_base);
err1:
release_mem_region(res->start, resource_size(res));
return err;
}
static int __devinit ehci_pxa168_drv_probe(struct platform_device *pdev)
{
struct resource *res;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct pxa168_usb_drv_data *drv_data;
void __iomem *regs;
int irq, err = 0;
if (usb_disabled())
return -ENODEV;
pr_debug("Initializing pxa168-SoC USB Host Controller\n");
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_err(&pdev->dev,
"Found HC with no IRQ. Check %s setup!\n",
dev_name(&pdev->dev));
err = -ENODEV;
goto err1;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev,
"Found HC with no register addr. Check %s setup!\n",
dev_name(&pdev->dev));
err = -ENODEV;
goto err1;
}
if (!request_mem_region(res->start, resource_size(res),
ehci_pxa168_hc_driver.description)) {
dev_dbg(&pdev->dev, "controller already in use\n");
err = -EBUSY;
goto err1;
}
regs = ioremap(res->start, resource_size(res));
if (regs == NULL) {
dev_dbg(&pdev->dev, "error mapping memory\n");
err = -EFAULT;
goto err2;
}
hcd = usb_create_hcd(&ehci_pxa168_hc_driver,
&pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
err = -ENOMEM;
goto err3;
}
drv_data = (struct pxa168_usb_drv_data *)hcd->hcd_priv;
/* Enable USB clock */
drv_data->pxa168_usb_clk = clk_get(&pdev->dev, "PXA168-USBCLK");
if (IS_ERR(drv_data->pxa168_usb_clk)) {
dev_err(&pdev->dev, "Couldn't get USB clock\n");
err = PTR_ERR(drv_data->pxa168_usb_clk);
goto err4;
}
clk_enable(drv_data->pxa168_usb_clk);
err = pxa168_usb_phy_init(pdev);
if (err) {
dev_err(&pdev->dev, "USB PHY initialization failed\n");
goto err5;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
hcd->regs = regs;
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs + 0x100;
ehci->regs = hcd->regs + 0x100 +
HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
hcd->has_tt = 1;
ehci->sbrn = 0x20;
err = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
if (err)
goto err5;
return 0;
err5:
clk_disable(drv_data->pxa168_usb_clk);
clk_put(drv_data->pxa168_usb_clk);
err4:
usb_put_hcd(hcd);
err3:
iounmap(regs);
err2:
release_mem_region(res->start, resource_size(res));
err1:
dev_err(&pdev->dev, "init %s fail, %d\n",
dev_name(&pdev->dev), err);
return err;
}
static int __exit ehci_pxa168_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct pxa168_usb_drv_data *drv_data =
(struct pxa168_usb_drv_data *)hcd->hcd_priv;
usb_remove_hcd(hcd);
/* Power down PHY & PLL */
writel(readl(drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG) & (~0x3),
drv_data->usb_phy_reg_base + USB_PHY_CTRL_REG);
clk_disable(drv_data->pxa168_usb_clk);
clk_put(drv_data->pxa168_usb_clk);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
iounmap(drv_data->usb_phy_reg_base);
release_mem_region(drv_data->usb_phy_res->start,
resource_size(drv_data->usb_phy_res));
usb_put_hcd(hcd);
return 0;
}
MODULE_ALIAS("platform:pxa168-ehci");
static struct platform_driver ehci_pxa168_driver = {
.probe = ehci_pxa168_drv_probe,
.remove = __exit_p(ehci_pxa168_drv_remove),
.shutdown = usb_hcd_platform_shutdown,
.driver.name = "pxa168-ehci",
};
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