mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
236 lines
5.6 KiB
236 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/** |
|
* cdns3-ti.c - TI specific Glue layer for Cadence USB Controller |
|
* |
|
* Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com |
|
*/ |
|
|
|
#include <linux/bits.h> |
|
#include <linux/clk.h> |
|
#include <linux/module.h> |
|
#include <linux/kernel.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/dma-mapping.h> |
|
#include <linux/io.h> |
|
#include <linux/of_platform.h> |
|
#include <linux/pm_runtime.h> |
|
|
|
/* USB Wrapper register offsets */ |
|
#define USBSS_PID 0x0 |
|
#define USBSS_W1 0x4 |
|
#define USBSS_STATIC_CONFIG 0x8 |
|
#define USBSS_PHY_TEST 0xc |
|
#define USBSS_DEBUG_CTRL 0x10 |
|
#define USBSS_DEBUG_INFO 0x14 |
|
#define USBSS_DEBUG_LINK_STATE 0x18 |
|
#define USBSS_DEVICE_CTRL 0x1c |
|
|
|
/* Wrapper 1 register bits */ |
|
#define USBSS_W1_PWRUP_RST BIT(0) |
|
#define USBSS_W1_OVERCURRENT_SEL BIT(8) |
|
#define USBSS_W1_MODESTRAP_SEL BIT(9) |
|
#define USBSS_W1_OVERCURRENT BIT(16) |
|
#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17) |
|
#define USBSS_W1_MODESTRAP_SHIFT 17 |
|
#define USBSS_W1_USB2_ONLY BIT(19) |
|
|
|
/* Static config register bits */ |
|
#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5) |
|
#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5 |
|
#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3) |
|
#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3 |
|
#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1) |
|
#define USBSS1_STATIC_VBUS_SEL_SHIFT 1 |
|
#define USBSS1_STATIC_LANE_REVERSE BIT(0) |
|
|
|
/* Modestrap modes */ |
|
enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE, |
|
USBSS_MODESTRAP_MODE_HOST, |
|
USBSS_MODESTRAP_MODE_PERIPHERAL}; |
|
|
|
struct cdns_ti { |
|
struct device *dev; |
|
void __iomem *usbss; |
|
unsigned usb2_only:1; |
|
unsigned vbus_divider:1; |
|
struct clk *usb2_refclk; |
|
struct clk *lpm_clk; |
|
}; |
|
|
|
static const int cdns_ti_rate_table[] = { /* in KHZ */ |
|
9600, |
|
10000, |
|
12000, |
|
19200, |
|
20000, |
|
24000, |
|
25000, |
|
26000, |
|
38400, |
|
40000, |
|
58000, |
|
50000, |
|
52000, |
|
}; |
|
|
|
static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset) |
|
{ |
|
return readl(data->usbss + offset); |
|
} |
|
|
|
static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value) |
|
{ |
|
writel(value, data->usbss + offset); |
|
} |
|
|
|
static int cdns_ti_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device_node *node = pdev->dev.of_node; |
|
struct cdns_ti *data; |
|
int error; |
|
u32 reg; |
|
int rate_code, i; |
|
unsigned long rate; |
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
platform_set_drvdata(pdev, data); |
|
|
|
data->dev = dev; |
|
|
|
data->usbss = devm_platform_ioremap_resource(pdev, 0); |
|
if (IS_ERR(data->usbss)) { |
|
dev_err(dev, "can't map IOMEM resource\n"); |
|
return PTR_ERR(data->usbss); |
|
} |
|
|
|
data->usb2_refclk = devm_clk_get(dev, "ref"); |
|
if (IS_ERR(data->usb2_refclk)) { |
|
dev_err(dev, "can't get usb2_refclk\n"); |
|
return PTR_ERR(data->usb2_refclk); |
|
} |
|
|
|
data->lpm_clk = devm_clk_get(dev, "lpm"); |
|
if (IS_ERR(data->lpm_clk)) { |
|
dev_err(dev, "can't get lpm_clk\n"); |
|
return PTR_ERR(data->lpm_clk); |
|
} |
|
|
|
rate = clk_get_rate(data->usb2_refclk); |
|
rate /= 1000; /* To KHz */ |
|
for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) { |
|
if (cdns_ti_rate_table[i] == rate) |
|
break; |
|
} |
|
|
|
if (i == ARRAY_SIZE(cdns_ti_rate_table)) { |
|
dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); |
|
return -EINVAL; |
|
} |
|
|
|
rate_code = i; |
|
|
|
pm_runtime_enable(dev); |
|
error = pm_runtime_get_sync(dev); |
|
if (error < 0) { |
|
dev_err(dev, "pm_runtime_get_sync failed: %d\n", error); |
|
goto err; |
|
} |
|
|
|
/* assert RESET */ |
|
reg = cdns_ti_readl(data, USBSS_W1); |
|
reg &= ~USBSS_W1_PWRUP_RST; |
|
cdns_ti_writel(data, USBSS_W1, reg); |
|
|
|
/* set static config */ |
|
reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); |
|
reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK; |
|
reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT; |
|
|
|
reg &= ~USBSS1_STATIC_VBUS_SEL_MASK; |
|
data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); |
|
if (data->vbus_divider) |
|
reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT; |
|
|
|
cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg); |
|
reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); |
|
|
|
/* set USB2_ONLY mode if requested */ |
|
reg = cdns_ti_readl(data, USBSS_W1); |
|
data->usb2_only = device_property_read_bool(dev, "ti,usb2-only"); |
|
if (data->usb2_only) |
|
reg |= USBSS_W1_USB2_ONLY; |
|
|
|
/* set default modestrap */ |
|
reg |= USBSS_W1_MODESTRAP_SEL; |
|
reg &= ~USBSS_W1_MODESTRAP_MASK; |
|
reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT; |
|
cdns_ti_writel(data, USBSS_W1, reg); |
|
|
|
/* de-assert RESET */ |
|
reg |= USBSS_W1_PWRUP_RST; |
|
cdns_ti_writel(data, USBSS_W1, reg); |
|
|
|
error = of_platform_populate(node, NULL, NULL, dev); |
|
if (error) { |
|
dev_err(dev, "failed to create children: %d\n", error); |
|
goto err; |
|
} |
|
|
|
return 0; |
|
|
|
err: |
|
pm_runtime_put_sync(data->dev); |
|
pm_runtime_disable(data->dev); |
|
|
|
return error; |
|
} |
|
|
|
static int cdns_ti_remove_core(struct device *dev, void *c) |
|
{ |
|
struct platform_device *pdev = to_platform_device(dev); |
|
|
|
platform_device_unregister(pdev); |
|
|
|
return 0; |
|
} |
|
|
|
static int cdns_ti_remove(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
|
|
device_for_each_child(dev, NULL, cdns_ti_remove_core); |
|
pm_runtime_put_sync(dev); |
|
pm_runtime_disable(dev); |
|
|
|
platform_set_drvdata(pdev, NULL); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id cdns_ti_of_match[] = { |
|
{ .compatible = "ti,j721e-usb", }, |
|
{ .compatible = "ti,am64-usb", }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, cdns_ti_of_match); |
|
|
|
static struct platform_driver cdns_ti_driver = { |
|
.probe = cdns_ti_probe, |
|
.remove = cdns_ti_remove, |
|
.driver = { |
|
.name = "cdns3-ti", |
|
.of_match_table = cdns_ti_of_match, |
|
}, |
|
}; |
|
|
|
module_platform_driver(cdns_ti_driver); |
|
|
|
MODULE_ALIAS("platform:cdns3-ti"); |
|
MODULE_AUTHOR("Roger Quadros <[email protected]>"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");
|
|
|