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linux-stable/drivers/usb/host/ohci-nxp.c
Linus Torvalds 8ceafbfa91 Merge branch 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-arm 
Pull DMA mask updates from Russell King:
 "This series cleans up the handling of DMA masks in a lot of drivers,
  fixing some bugs as we go.

  Some of the more serious errors include:
   - drivers which only set their coherent DMA mask if the attempt to
     set the streaming mask fails.
   - drivers which test for a NULL dma mask pointer, and then set the
     dma mask pointer to a location in their module .data section -
     which will cause problems if the module is reloaded.

  To counter these, I have introduced two helper functions:
   - dma_set_mask_and_coherent() takes care of setting both the
     streaming and coherent masks at the same time, with the correct
     error handling as specified by the API.
   - dma_coerce_mask_and_coherent() which resolves the problem of
     drivers forcefully setting DMA masks.  This is more a marker for
     future work to further clean these locations up - the code which
     creates the devices really should be initialising these, but to fix
     that in one go along with this change could potentially be very
     disruptive.

  The last thing this series does is prise away some of Linux's addition
  to "DMA addresses are physical addresses and RAM always starts at
  zero".  We have ARM LPAE systems where all system memory is above 4GB
  physical, hence having DMA masks interpreted by (eg) the block layers
  as describing physical addresses in the range 0..DMAMASK fails on
  these platforms.  Santosh Shilimkar addresses this in this series; the
  patches were copied to the appropriate people multiple times but were
  ignored.

  Fixing this also gets rid of some ARM weirdness in the setup of the
  max*pfn variables, and brings ARM into line with every other Linux
  architecture as far as those go"

* 'for-linus-dma-masks' of git://git.linaro.org/people/rmk/linux-arm: (52 commits)
  ARM: 7805/1: mm: change max*pfn to include the physical offset of memory
  ARM: 7797/1: mmc: Use dma_max_pfn(dev) helper for bounce_limit calculations
  ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for bounce_limit calculations
  ARM: 7795/1: mm: dma-mapping: Add dma_max_pfn(dev) helper function
  ARM: 7794/1: block: Rename parameter dma_mask to max_addr for blk_queue_bounce_limit()
  ARM: DMA-API: better handing of DMA masks for coherent allocations
  ARM: 7857/1: dma: imx-sdma: setup dma mask
  DMA-API: firmware/google/gsmi.c: avoid direct access to DMA masks
  DMA-API: dcdbas: update DMA mask handing
  DMA-API: dma: edma.c: no need to explicitly initialize DMA masks
  DMA-API: usb: musb: use platform_device_register_full() to avoid directly messing with dma masks
  DMA-API: crypto: remove last references to 'static struct device *dev'
  DMA-API: crypto: fix ixp4xx crypto platform device support
  DMA-API: others: use dma_set_coherent_mask()
  DMA-API: staging: use dma_set_coherent_mask()
  DMA-API: usb: use new dma_coerce_mask_and_coherent()
  DMA-API: usb: use dma_set_coherent_mask()
  DMA-API: parport: parport_pc.c: use dma_coerce_mask_and_coherent()
  DMA-API: net: octeon: use dma_coerce_mask_and_coherent()
  DMA-API: net: nxp/lpc_eth: use dma_coerce_mask_and_coherent()
  ...
2013-11-14 07:55:21 +09:00

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/*
* driver for NXP USB Host devices
*
* Currently supported OHCI host devices:
* - NXP LPC32xx
*
* Authors: Dmitry Chigirev <source@mvista.com>
* Vitaly Wool <vitalywool@gmail.com>
*
* register initialization is based on code examples provided by Philips
* Copyright (c) 2005 Koninklijke Philips Electronics N.V.
*
* NOTE: This driver does not have suspend/resume functionality
* This driver is intended for engineering development purposes only
*
* 2005-2006 (c) MontaVista Software, Inc. 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/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/isp1301.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ohci.h"
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/io.h>
#include <mach/platform.h>
#include <mach/irqs.h>
#define USB_CONFIG_BASE 0x31020000
#define PWRMAN_BASE 0x40004000
#define USB_CTRL IO_ADDRESS(PWRMAN_BASE + 0x64)
/* USB_CTRL bit defines */
#define USB_SLAVE_HCLK_EN (1 << 24)
#define USB_DEV_NEED_CLK_EN (1 << 22)
#define USB_HOST_NEED_CLK_EN (1 << 21)
#define PAD_CONTROL_LAST_DRIVEN (1 << 19)
#define USB_OTG_STAT_CONTROL IO_ADDRESS(USB_CONFIG_BASE + 0x110)
/* USB_OTG_STAT_CONTROL bit defines */
#define TRANSPARENT_I2C_EN (1 << 7)
#define HOST_EN (1 << 0)
/* On LPC32xx, those are undefined */
#ifndef start_int_set_falling_edge
#define start_int_set_falling_edge(irq)
#define start_int_set_rising_edge(irq)
#define start_int_ack(irq)
#define start_int_mask(irq)
#define start_int_umask(irq)
#endif
#define DRIVER_DESC "OHCI NXP driver"
static const char hcd_name[] = "ohci-nxp";
static struct hc_driver __read_mostly ohci_nxp_hc_driver;
static struct i2c_client *isp1301_i2c_client;
extern int usb_disabled(void);
static struct clk *usb_pll_clk;
static struct clk *usb_dev_clk;
static struct clk *usb_otg_clk;
static void isp1301_configure_lpc32xx(void)
{
/* LPC32XX only supports DAT_SE0 USB mode */
/* This sequence is important */
/* Disable transparent UART mode first */
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
MC1_UART_EN);
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
~MC1_SPEED_REG);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR),
~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_2,
(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL));
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR), ~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1,
(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN));
i2c_smbus_write_byte_data(isp1301_i2c_client,
(ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR),
(OTG1_DM_PULLUP | OTG1_DP_PULLUP));
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR,
~0);
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR, ~0);
/* Enable usb_need_clk clock after transceiver is initialized */
__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
printk(KERN_INFO "ISP1301 Vendor ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x00));
printk(KERN_INFO "ISP1301 Product ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x02));
printk(KERN_INFO "ISP1301 Version ID : 0x%04x\n",
i2c_smbus_read_word_data(isp1301_i2c_client, 0x14));
}
static void isp1301_configure(void)
{
isp1301_configure_lpc32xx();
}
static inline void isp1301_vbus_on(void)
{
i2c_smbus_write_byte_data(isp1301_i2c_client, ISP1301_I2C_OTG_CONTROL_1,
OTG1_VBUS_DRV);
}
static inline void isp1301_vbus_off(void)
{
i2c_smbus_write_byte_data(isp1301_i2c_client,
ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR,
OTG1_VBUS_DRV);
}
static void ohci_nxp_start_hc(void)
{
unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
__raw_writel(tmp, USB_OTG_STAT_CONTROL);
isp1301_vbus_on();
}
static void ohci_nxp_stop_hc(void)
{
unsigned long tmp;
isp1301_vbus_off();
tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
__raw_writel(tmp, USB_OTG_STAT_CONTROL);
}
static int ohci_hcd_nxp_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd = 0;
const struct hc_driver *driver = &ohci_nxp_hc_driver;
struct resource *res;
int ret = 0, irq;
struct device_node *isp1301_node;
if (pdev->dev.of_node) {
isp1301_node = of_parse_phandle(pdev->dev.of_node,
"transceiver", 0);
} else {
isp1301_node = NULL;
}
isp1301_i2c_client = isp1301_get_client(isp1301_node);
if (!isp1301_i2c_client) {
return -EPROBE_DEFER;
}
ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (ret)
goto fail_disable;
dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (nxp)\n", hcd_name);
if (usb_disabled()) {
dev_err(&pdev->dev, "USB is disabled\n");
ret = -ENODEV;
goto fail_disable;
}
/* Enable AHB slave USB clock, needed for further USB clock control */
__raw_writel(USB_SLAVE_HCLK_EN | PAD_CONTROL_LAST_DRIVEN, USB_CTRL);
/* Enable USB PLL */
usb_pll_clk = clk_get(&pdev->dev, "ck_pll5");
if (IS_ERR(usb_pll_clk)) {
dev_err(&pdev->dev, "failed to acquire USB PLL\n");
ret = PTR_ERR(usb_pll_clk);
goto fail_pll;
}
ret = clk_enable(usb_pll_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to start USB PLL\n");
goto fail_pllen;
}
ret = clk_set_rate(usb_pll_clk, 48000);
if (ret < 0) {
dev_err(&pdev->dev, "failed to set USB clock rate\n");
goto fail_rate;
}
/* Enable USB device clock */
usb_dev_clk = clk_get(&pdev->dev, "ck_usbd");
if (IS_ERR(usb_dev_clk)) {
dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
ret = PTR_ERR(usb_dev_clk);
goto fail_dev;
}
ret = clk_enable(usb_dev_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
goto fail_deven;
}
/* Enable USB otg clocks */
usb_otg_clk = clk_get(&pdev->dev, "ck_usb_otg");
if (IS_ERR(usb_otg_clk)) {
dev_err(&pdev->dev, "failed to acquire USB DEV Clock\n");
ret = PTR_ERR(usb_otg_clk);
goto fail_otg;
}
__raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
ret = clk_enable(usb_otg_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to start USB DEV Clock\n");
goto fail_otgen;
}
isp1301_configure();
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
dev_err(&pdev->dev, "Failed to allocate HC buffer\n");
ret = -ENOMEM;
goto fail_hcd;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
ret = PTR_ERR(hcd->regs);
goto fail_resource;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = -ENXIO;
goto fail_resource;
}
ohci_nxp_start_hc();
platform_set_drvdata(pdev, hcd);
dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
ret = usb_add_hcd(hcd, irq, 0);
if (ret == 0)
return ret;
ohci_nxp_stop_hc();
fail_resource:
usb_put_hcd(hcd);
fail_hcd:
clk_disable(usb_otg_clk);
fail_otgen:
clk_put(usb_otg_clk);
fail_otg:
clk_disable(usb_dev_clk);
fail_deven:
clk_put(usb_dev_clk);
fail_dev:
fail_rate:
clk_disable(usb_pll_clk);
fail_pllen:
clk_put(usb_pll_clk);
fail_pll:
fail_disable:
isp1301_i2c_client = NULL;
return ret;
}
static int ohci_hcd_nxp_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
usb_remove_hcd(hcd);
ohci_nxp_stop_hc();
usb_put_hcd(hcd);
clk_disable(usb_pll_clk);
clk_put(usb_pll_clk);
clk_disable(usb_dev_clk);
clk_put(usb_dev_clk);
i2c_unregister_device(isp1301_i2c_client);
isp1301_i2c_client = NULL;
return 0;
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:usb-ohci");
#ifdef CONFIG_OF
static const struct of_device_id ohci_hcd_nxp_match[] = {
{ .compatible = "nxp,ohci-nxp" },
{},
};
MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match);
#endif
static struct platform_driver ohci_hcd_nxp_driver = {
.driver = {
.name = "usb-ohci",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ohci_hcd_nxp_match),
},
.probe = ohci_hcd_nxp_probe,
.remove = ohci_hcd_nxp_remove,
};
static int __init ohci_nxp_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info("%s: " DRIVER_DESC "\n", hcd_name);
ohci_init_driver(&ohci_nxp_hc_driver, NULL);
return platform_driver_register(&ohci_hcd_nxp_driver);
}
module_init(ohci_nxp_init);
static void __exit ohci_nxp_cleanup(void)
{
platform_driver_unregister(&ohci_hcd_nxp_driver);
}
module_exit(ohci_nxp_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
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