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linux_dsm_epyc7002/arch/mips/cavium-octeon/octeon-usb.c
Paul Burton 2a15d64817
MIPS: Annotate fall-through in Cavium Octeon code 
There's an intentional switch case fall-through in Cavium Octeon USB
code, which triggers compile errors with -Wimplicit-fallthrough due to
-Werror being enabled for arch/mips.

This can be encountered when building cavium_octeon_defconfig.

Fix the build issue by annotating the intentional fall-through.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
2019-07-18 14:41:49 -07:00

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/*
* XHCI HCD glue for Cavium Octeon III SOCs.
*
* Copyright (C) 2010-2017 Cavium Networks
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/of_platform.h>
#include <linux/io.h>
#include <asm/octeon/octeon.h>
/* USB Control Register */
union cvm_usbdrd_uctl_ctl {
uint64_t u64;
struct cvm_usbdrd_uctl_ctl_s {
/* 1 = BIST and set all USB RAMs to 0x0, 0 = BIST */
__BITFIELD_FIELD(uint64_t clear_bist:1,
/* 1 = Start BIST and cleared by hardware */
__BITFIELD_FIELD(uint64_t start_bist:1,
/* Reference clock select for SuperSpeed and HighSpeed PLLs:
* 0x0 = Both PLLs use DLMC_REF_CLK0 for reference clock
* 0x1 = Both PLLs use DLMC_REF_CLK1 for reference clock
* 0x2 = SuperSpeed PLL uses DLMC_REF_CLK0 for reference clock &
* HighSpeed PLL uses PLL_REF_CLK for reference clck
* 0x3 = SuperSpeed PLL uses DLMC_REF_CLK1 for reference clock &
* HighSpeed PLL uses PLL_REF_CLK for reference clck
*/
__BITFIELD_FIELD(uint64_t ref_clk_sel:2,
/* 1 = Spread-spectrum clock enable, 0 = SS clock disable */
__BITFIELD_FIELD(uint64_t ssc_en:1,
/* Spread-spectrum clock modulation range:
* 0x0 = -4980 ppm downspread
* 0x1 = -4492 ppm downspread
* 0x2 = -4003 ppm downspread
* 0x3 - 0x7 = Reserved
*/
__BITFIELD_FIELD(uint64_t ssc_range:3,
/* Enable non-standard oscillator frequencies:
* [55:53] = modules -1
* [52:47] = 2's complement push amount, 0 = Feature disabled
*/
__BITFIELD_FIELD(uint64_t ssc_ref_clk_sel:9,
/* Reference clock multiplier for non-standard frequencies:
* 0x19 = 100MHz on DLMC_REF_CLK* if REF_CLK_SEL = 0x0 or 0x1
* 0x28 = 125MHz on DLMC_REF_CLK* if REF_CLK_SEL = 0x0 or 0x1
* 0x32 = 50MHz on DLMC_REF_CLK* if REF_CLK_SEL = 0x0 or 0x1
* Other Values = Reserved
*/
__BITFIELD_FIELD(uint64_t mpll_multiplier:7,
/* Enable reference clock to prescaler for SuperSpeed functionality.
* Should always be set to "1"
*/
__BITFIELD_FIELD(uint64_t ref_ssp_en:1,
/* Divide the reference clock by 2 before entering the
* REF_CLK_FSEL divider:
* If REF_CLK_SEL = 0x0 or 0x1, then only 0x0 is legal
* If REF_CLK_SEL = 0x2 or 0x3, then:
* 0x1 = DLMC_REF_CLK* is 125MHz
* 0x0 = DLMC_REF_CLK* is another supported frequency
*/
__BITFIELD_FIELD(uint64_t ref_clk_div2:1,
/* Select reference clock freqnuency for both PLL blocks:
* 0x27 = REF_CLK_SEL is 0x0 or 0x1
* 0x07 = REF_CLK_SEL is 0x2 or 0x3
*/
__BITFIELD_FIELD(uint64_t ref_clk_fsel:6,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_31_31:1,
/* Controller clock enable. */
__BITFIELD_FIELD(uint64_t h_clk_en:1,
/* Select bypass input to controller clock divider:
* 0x0 = Use divided coprocessor clock from H_CLKDIV
* 0x1 = Use clock from GPIO pins
*/
__BITFIELD_FIELD(uint64_t h_clk_byp_sel:1,
/* Reset controller clock divider. */
__BITFIELD_FIELD(uint64_t h_clkdiv_rst:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_27_27:1,
/* Clock divider select:
* 0x0 = divide by 1
* 0x1 = divide by 2
* 0x2 = divide by 4
* 0x3 = divide by 6
* 0x4 = divide by 8
* 0x5 = divide by 16
* 0x6 = divide by 24
* 0x7 = divide by 32
*/
__BITFIELD_FIELD(uint64_t h_clkdiv_sel:3,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_22_23:2,
/* USB3 port permanently attached: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t usb3_port_perm_attach:1,
/* USB2 port permanently attached: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t usb2_port_perm_attach:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_19_19:1,
/* Disable SuperSpeed PHY: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t usb3_port_disable:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_17_17:1,
/* Disable HighSpeed PHY: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t usb2_port_disable:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_15_15:1,
/* Enable PHY SuperSpeed block power: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t ss_power_en:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_13_13:1,
/* Enable PHY HighSpeed block power: 0x0 = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t hs_power_en:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_5_11:7,
/* Enable USB UCTL interface clock: 0xx = No, 0x1 = Yes */
__BITFIELD_FIELD(uint64_t csclk_en:1,
/* Controller mode: 0x0 = Host, 0x1 = Device */
__BITFIELD_FIELD(uint64_t drd_mode:1,
/* PHY reset */
__BITFIELD_FIELD(uint64_t uphy_rst:1,
/* Software reset UAHC */
__BITFIELD_FIELD(uint64_t uahc_rst:1,
/* Software resets UCTL */
__BITFIELD_FIELD(uint64_t uctl_rst:1,
;)))))))))))))))))))))))))))))))))
} s;
};
/* UAHC Configuration Register */
union cvm_usbdrd_uctl_host_cfg {
uint64_t u64;
struct cvm_usbdrd_uctl_host_cfg_s {
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_60_63:4,
/* Indicates minimum value of all received BELT values */
__BITFIELD_FIELD(uint64_t host_current_belt:12,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_38_47:10,
/* HS jitter adjustment */
__BITFIELD_FIELD(uint64_t fla:6,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_29_31:3,
/* Bus-master enable: 0x0 = Disabled (stall DMAs), 0x1 = enabled */
__BITFIELD_FIELD(uint64_t bme:1,
/* Overcurrent protection enable: 0x0 = unavailable, 0x1 = available */
__BITFIELD_FIELD(uint64_t oci_en:1,
/* Overcurrent sene selection:
* 0x0 = Overcurrent indication from off-chip is active-low
* 0x1 = Overcurrent indication from off-chip is active-high
*/
__BITFIELD_FIELD(uint64_t oci_active_high_en:1,
/* Port power control enable: 0x0 = unavailable, 0x1 = available */
__BITFIELD_FIELD(uint64_t ppc_en:1,
/* Port power control sense selection:
* 0x0 = Port power to off-chip is active-low
* 0x1 = Port power to off-chip is active-high
*/
__BITFIELD_FIELD(uint64_t ppc_active_high_en:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_0_23:24,
;)))))))))))
} s;
};
/* UCTL Shim Features Register */
union cvm_usbdrd_uctl_shim_cfg {
uint64_t u64;
struct cvm_usbdrd_uctl_shim_cfg_s {
/* Out-of-bound UAHC register access: 0 = read, 1 = write */
__BITFIELD_FIELD(uint64_t xs_ncb_oob_wrn:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_60_62:3,
/* SRCID error log for out-of-bound UAHC register access:
* [59:58] = chipID
* [57] = Request source: 0 = core, 1 = NCB-device
* [56:51] = Core/NCB-device number, [56] always 0 for NCB devices
* [50:48] = SubID
*/
__BITFIELD_FIELD(uint64_t xs_ncb_oob_osrc:12,
/* Error log for bad UAHC DMA access: 0 = Read log, 1 = Write log */
__BITFIELD_FIELD(uint64_t xm_bad_dma_wrn:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_44_46:3,
/* Encoded error type for bad UAHC DMA */
__BITFIELD_FIELD(uint64_t xm_bad_dma_type:4,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_13_39:27,
/* Select the IOI read command used by DMA accesses */
__BITFIELD_FIELD(uint64_t dma_read_cmd:1,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_10_11:2,
/* Select endian format for DMA accesses to the L2c:
* 0x0 = Little endian
*` 0x1 = Big endian
* 0x2 = Reserved
* 0x3 = Reserved
*/
__BITFIELD_FIELD(uint64_t dma_endian_mode:2,
/* Reserved */
__BITFIELD_FIELD(uint64_t reserved_2_7:6,
/* Select endian format for IOI CSR access to UAHC:
* 0x0 = Little endian
*` 0x1 = Big endian
* 0x2 = Reserved
* 0x3 = Reserved
*/
__BITFIELD_FIELD(uint64_t csr_endian_mode:2,
;))))))))))))
} s;
};
#define OCTEON_H_CLKDIV_SEL 8
#define OCTEON_MIN_H_CLK_RATE 150000000
#define OCTEON_MAX_H_CLK_RATE 300000000
static DEFINE_MUTEX(dwc3_octeon_clocks_mutex);
static uint8_t clk_div[OCTEON_H_CLKDIV_SEL] = {1, 2, 4, 6, 8, 16, 24, 32};
static int dwc3_octeon_config_power(struct device *dev, u64 base)
{
#define UCTL_HOST_CFG 0xe0
union cvm_usbdrd_uctl_host_cfg uctl_host_cfg;
union cvmx_gpio_bit_cfgx gpio_bit;
uint32_t gpio_pwr[3];
int gpio, len, power_active_low;
struct device_node *node = dev->of_node;
int index = (base >> 24) & 1;
if (of_find_property(node, "power", &len) != NULL) {
if (len == 12) {
of_property_read_u32_array(node, "power", gpio_pwr, 3);
power_active_low = gpio_pwr[2] & 0x01;
gpio = gpio_pwr[1];
} else if (len == 8) {
of_property_read_u32_array(node, "power", gpio_pwr, 2);
power_active_low = 0;
gpio = gpio_pwr[1];
} else {
dev_err(dev, "dwc3 controller clock init failure.\n");
return -EINVAL;
}
if ((OCTEON_IS_MODEL(OCTEON_CN73XX) ||
OCTEON_IS_MODEL(OCTEON_CNF75XX))
&& gpio <= 31) {
gpio_bit.u64 = cvmx_read_csr(CVMX_GPIO_BIT_CFGX(gpio));
gpio_bit.s.tx_oe = 1;
gpio_bit.s.output_sel = (index == 0 ? 0x14 : 0x15);
cvmx_write_csr(CVMX_GPIO_BIT_CFGX(gpio), gpio_bit.u64);
} else if (gpio <= 15) {
gpio_bit.u64 = cvmx_read_csr(CVMX_GPIO_BIT_CFGX(gpio));
gpio_bit.s.tx_oe = 1;
gpio_bit.s.output_sel = (index == 0 ? 0x14 : 0x19);
cvmx_write_csr(CVMX_GPIO_BIT_CFGX(gpio), gpio_bit.u64);
} else {
gpio_bit.u64 = cvmx_read_csr(CVMX_GPIO_XBIT_CFGX(gpio));
gpio_bit.s.tx_oe = 1;
gpio_bit.s.output_sel = (index == 0 ? 0x14 : 0x19);
cvmx_write_csr(CVMX_GPIO_XBIT_CFGX(gpio), gpio_bit.u64);
}
/* Enable XHCI power control and set if active high or low. */
uctl_host_cfg.u64 = cvmx_read_csr(base + UCTL_HOST_CFG);
uctl_host_cfg.s.ppc_en = 1;
uctl_host_cfg.s.ppc_active_high_en = !power_active_low;
cvmx_write_csr(base + UCTL_HOST_CFG, uctl_host_cfg.u64);
} else {
/* Disable XHCI power control and set if active high. */
uctl_host_cfg.u64 = cvmx_read_csr(base + UCTL_HOST_CFG);
uctl_host_cfg.s.ppc_en = 0;
uctl_host_cfg.s.ppc_active_high_en = 0;
cvmx_write_csr(base + UCTL_HOST_CFG, uctl_host_cfg.u64);
dev_warn(dev, "dwc3 controller clock init failure.\n");
}
return 0;
}
static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
{
union cvm_usbdrd_uctl_ctl uctl_ctl;
int ref_clk_sel = 2;
u64 div;
u32 clock_rate;
int mpll_mul;
int i;
u64 h_clk_rate;
u64 uctl_ctl_reg = base;
if (dev->of_node) {
const char *ss_clock_type;
const char *hs_clock_type;
i = of_property_read_u32(dev->of_node,
"refclk-frequency", &clock_rate);
if (i) {
pr_err("No UCTL \"refclk-frequency\"\n");
return -EINVAL;
}
i = of_property_read_string(dev->of_node,
"refclk-type-ss", &ss_clock_type);
if (i) {
pr_err("No UCTL \"refclk-type-ss\"\n");
return -EINVAL;
}
i = of_property_read_string(dev->of_node,
"refclk-type-hs", &hs_clock_type);
if (i) {
pr_err("No UCTL \"refclk-type-hs\"\n");
return -EINVAL;
}
if (strcmp("dlmc_ref_clk0", ss_clock_type) == 0) {
if (strcmp(hs_clock_type, "dlmc_ref_clk0") == 0)
ref_clk_sel = 0;
else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
ref_clk_sel = 2;
else
pr_err("Invalid HS clock type %s, using pll_ref_clk instead\n",
hs_clock_type);
} else if (strcmp(ss_clock_type, "dlmc_ref_clk1") == 0) {
if (strcmp(hs_clock_type, "dlmc_ref_clk1") == 0)
ref_clk_sel = 1;
else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
ref_clk_sel = 3;
else {
pr_err("Invalid HS clock type %s, using pll_ref_clk instead\n",
hs_clock_type);
ref_clk_sel = 3;
}
} else
pr_err("Invalid SS clock type %s, using dlmc_ref_clk0 instead\n",
ss_clock_type);
if ((ref_clk_sel == 0 || ref_clk_sel == 1) &&
(clock_rate != 100000000))
pr_err("Invalid UCTL clock rate of %u, using 100000000 instead\n",
clock_rate);
} else {
pr_err("No USB UCTL device node\n");
return -EINVAL;
}
/*
* Step 1: Wait for all voltages to be stable...that surely
* happened before starting the kernel. SKIP
*/
/* Step 2: Select GPIO for overcurrent indication, if desired. SKIP */
/* Step 3: Assert all resets. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.uphy_rst = 1;
uctl_ctl.s.uahc_rst = 1;
uctl_ctl.s.uctl_rst = 1;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 4a: Reset the clock dividers. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.h_clkdiv_rst = 1;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 4b: Select controller clock frequency. */
for (div = 0; div < OCTEON_H_CLKDIV_SEL; div++) {
h_clk_rate = octeon_get_io_clock_rate() / clk_div[div];
if (h_clk_rate <= OCTEON_MAX_H_CLK_RATE &&
h_clk_rate >= OCTEON_MIN_H_CLK_RATE)
break;
}
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.h_clkdiv_sel = div;
uctl_ctl.s.h_clk_en = 1;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
if ((div != uctl_ctl.s.h_clkdiv_sel) || (!uctl_ctl.s.h_clk_en)) {
dev_err(dev, "dwc3 controller clock init failure.\n");
return -EINVAL;
}
/* Step 4c: Deassert the controller clock divider reset. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.h_clkdiv_rst = 0;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 5a: Reference clock configuration. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.ref_clk_sel = ref_clk_sel;
uctl_ctl.s.ref_clk_fsel = 0x07;
uctl_ctl.s.ref_clk_div2 = 0;
switch (clock_rate) {
default:
dev_err(dev, "Invalid ref_clk %u, using 100000000 instead\n",
clock_rate);
/* fall through */
case 100000000:
mpll_mul = 0x19;
if (ref_clk_sel < 2)
uctl_ctl.s.ref_clk_fsel = 0x27;
break;
case 50000000:
mpll_mul = 0x32;
break;
case 125000000:
mpll_mul = 0x28;
break;
}
uctl_ctl.s.mpll_multiplier = mpll_mul;
/* Step 5b: Configure and enable spread-spectrum for SuperSpeed. */
uctl_ctl.s.ssc_en = 1;
/* Step 5c: Enable SuperSpeed. */
uctl_ctl.s.ref_ssp_en = 1;
/* Step 5d: Cofngiure PHYs. SKIP */
/* Step 6a & 6b: Power up PHYs. */
uctl_ctl.s.hs_power_en = 1;
uctl_ctl.s.ss_power_en = 1;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 7: Wait 10 controller-clock cycles to take effect. */
udelay(10);
/* Step 8a: Deassert UCTL reset signal. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.uctl_rst = 0;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 8b: Wait 10 controller-clock cycles. */
udelay(10);
/* Steo 8c: Setup power-power control. */
if (dwc3_octeon_config_power(dev, base)) {
dev_err(dev, "Error configuring power.\n");
return -EINVAL;
}
/* Step 8d: Deassert UAHC reset signal. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.uahc_rst = 0;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/* Step 8e: Wait 10 controller-clock cycles. */
udelay(10);
/* Step 9: Enable conditional coprocessor clock of UCTL. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.csclk_en = 1;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
/*Step 10: Set for host mode only. */
uctl_ctl.u64 = cvmx_read_csr(uctl_ctl_reg);
uctl_ctl.s.drd_mode = 0;
cvmx_write_csr(uctl_ctl_reg, uctl_ctl.u64);
return 0;
}
static void __init dwc3_octeon_set_endian_mode(u64 base)
{
#define UCTL_SHIM_CFG 0xe8
union cvm_usbdrd_uctl_shim_cfg shim_cfg;
shim_cfg.u64 = cvmx_read_csr(base + UCTL_SHIM_CFG);
#ifdef __BIG_ENDIAN
shim_cfg.s.dma_endian_mode = 1;
shim_cfg.s.csr_endian_mode = 1;
#else
shim_cfg.s.dma_endian_mode = 0;
shim_cfg.s.csr_endian_mode = 0;
#endif
cvmx_write_csr(base + UCTL_SHIM_CFG, shim_cfg.u64);
}
#define CVMX_USBDRDX_UCTL_CTL(index) \
(CVMX_ADD_IO_SEG(0x0001180068000000ull) + \
((index & 1) * 0x1000000ull))
static void __init dwc3_octeon_phy_reset(u64 base)
{
union cvm_usbdrd_uctl_ctl uctl_ctl;
int index = (base >> 24) & 1;
uctl_ctl.u64 = cvmx_read_csr(CVMX_USBDRDX_UCTL_CTL(index));
uctl_ctl.s.uphy_rst = 0;
cvmx_write_csr(CVMX_USBDRDX_UCTL_CTL(index), uctl_ctl.u64);
}
static int __init dwc3_octeon_device_init(void)
{
const char compat_node_name[] = "cavium,octeon-7130-usb-uctl";
struct platform_device *pdev;
struct device_node *node;
struct resource *res;
void __iomem *base;
/*
* There should only be three universal controllers, "uctl"
* in the device tree. Two USB and a SATA, which we ignore.
*/
node = NULL;
do {
node = of_find_node_by_name(node, "uctl");
if (!node)
return -ENODEV;
if (of_device_is_compatible(node, compat_node_name)) {
pdev = of_find_device_by_node(node);
if (!pdev)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No memory resources\n");
return -ENXIO;
}
/*
* The code below maps in the registers necessary for
* setting up the clocks and reseting PHYs. We must
* release the resources so the dwc3 subsystem doesn't
* know the difference.
*/
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
mutex_lock(&dwc3_octeon_clocks_mutex);
dwc3_octeon_clocks_start(&pdev->dev, (u64)base);
dwc3_octeon_set_endian_mode((u64)base);
dwc3_octeon_phy_reset((u64)base);
dev_info(&pdev->dev, "clocks initialized.\n");
mutex_unlock(&dwc3_octeon_clocks_mutex);
devm_iounmap(&pdev->dev, base);
devm_release_mem_region(&pdev->dev, res->start,
resource_size(res));
}
} while (node != NULL);
return 0;
}
device_initcall(dwc3_octeon_device_init);
MODULE_AUTHOR("David Daney <david.daney@cavium.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("USB driver for OCTEON III SoC");
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