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authorThinh Nguyen <thinh.nguyen@synopsys.com>2018-11-07 17:55:13 -0800
committerFelipe Balbi <felipe.balbi@linux.intel.com>2018-11-26 09:06:31 +0200
commit62ba09d6bb6330d8a70e40e23891d8764663d469 (patch)
tree1a4ca0d85190f6cf118ab2e7b0615057ccf44034 /drivers/usb/dwc3/debugfs.c
parent0f874f79dc81aec0229babebd6ef04e591a548d2 (diff)
downloadlinux-62ba09d6bb6330d8a70e40e23891d8764663d469.tar.gz
usb: dwc3: debugfs: Dump internal LSP and ep registers
To dump internal LSP and endpoint state debug registers, we must write to GDBGLSPMUX register. This patch correctly dump LSP and endpoint states from the debug registers. If the controller is in device mode, all LSP and endpoint state registers will be dumped via the debugfs attribute "lsp_dump". In host mode, the user has to write the LSP number to "lsp_dump" to dump a specific LSP selection. Fixes: 80b776340c78 ("usb: dwc3: Dump LSP and BMU debug info") Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3/debugfs.c')
-rw-r--r--drivers/usb/dwc3/debugfs.c145
1 files changed, 141 insertions, 4 deletions
diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c
index bd3d75b2f8bc..1da012f105d7 100644
--- a/drivers/usb/dwc3/debugfs.c
+++ b/drivers/usb/dwc3/debugfs.c
@@ -25,6 +25,8 @@
#include "io.h"
#include "debug.h"
+#define DWC3_LSP_MUX_UNSELECTED 0xfffff
+
#define dump_register(nm) \
{ \
.name = __stringify(nm), \
@@ -82,10 +84,6 @@ static const struct debugfs_reg32 dwc3_regs[] = {
dump_register(GDBGFIFOSPACE),
dump_register(GDBGLTSSM),
dump_register(GDBGBMU),
- dump_register(GDBGLSPMUX),
- dump_register(GDBGLSP),
- dump_register(GDBGEPINFO0),
- dump_register(GDBGEPINFO1),
dump_register(GPRTBIMAP_HS0),
dump_register(GPRTBIMAP_HS1),
dump_register(GPRTBIMAP_FS0),
@@ -279,6 +277,114 @@ static const struct debugfs_reg32 dwc3_regs[] = {
dump_register(OSTS),
};
+static void dwc3_host_lsp(struct seq_file *s)
+{
+ struct dwc3 *dwc = s->private;
+ bool dbc_enabled;
+ u32 sel;
+ u32 reg;
+ u32 val;
+
+ dbc_enabled = !!(dwc->hwparams.hwparams1 & DWC3_GHWPARAMS1_ENDBC);
+
+ sel = dwc->dbg_lsp_select;
+ if (sel == DWC3_LSP_MUX_UNSELECTED) {
+ seq_puts(s, "Write LSP selection to print for host\n");
+ return;
+ }
+
+ reg = DWC3_GDBGLSPMUX_HOSTSELECT(sel);
+
+ dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
+ val = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
+ seq_printf(s, "GDBGLSP[%d] = 0x%08x\n", sel, val);
+
+ if (dbc_enabled && sel < 256) {
+ reg |= DWC3_GDBGLSPMUX_ENDBC;
+ dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
+ val = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
+ seq_printf(s, "GDBGLSP_DBC[%d] = 0x%08x\n", sel, val);
+ }
+}
+
+static void dwc3_gadget_lsp(struct seq_file *s)
+{
+ struct dwc3 *dwc = s->private;
+ int i;
+ u32 reg;
+
+ for (i = 0; i < 16; i++) {
+ reg = DWC3_GDBGLSPMUX_DEVSELECT(i);
+ dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
+ reg = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
+ seq_printf(s, "GDBGLSP[%d] = 0x%08x\n", i, reg);
+ }
+}
+
+static int dwc3_lsp_show(struct seq_file *s, void *unused)
+{
+ struct dwc3 *dwc = s->private;
+ unsigned int current_mode;
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ reg = dwc3_readl(dwc->regs, DWC3_GSTS);
+ current_mode = DWC3_GSTS_CURMOD(reg);
+
+ switch (current_mode) {
+ case DWC3_GSTS_CURMOD_HOST:
+ dwc3_host_lsp(s);
+ break;
+ case DWC3_GSTS_CURMOD_DEVICE:
+ dwc3_gadget_lsp(s);
+ break;
+ default:
+ seq_puts(s, "Mode is unknown, no LSP register printed\n");
+ break;
+ }
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return 0;
+}
+
+static int dwc3_lsp_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dwc3_lsp_show, inode->i_private);
+}
+
+static ssize_t dwc3_lsp_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct dwc3 *dwc = s->private;
+ unsigned long flags;
+ char buf[32] = { 0 };
+ u32 sel;
+ int ret;
+
+ if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ ret = kstrtouint(buf, 0, &sel);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ dwc->dbg_lsp_select = sel;
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return count;
+}
+
+static const struct file_operations dwc3_lsp_fops = {
+ .open = dwc3_lsp_open,
+ .write = dwc3_lsp_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int dwc3_mode_show(struct seq_file *s, void *unused)
{
struct dwc3 *dwc = s->private;
@@ -683,6 +789,30 @@ out:
return 0;
}
+static int dwc3_ep_info_register_show(struct seq_file *s, void *unused)
+{
+ struct dwc3_ep *dep = s->private;
+ struct dwc3 *dwc = dep->dwc;
+ unsigned long flags;
+ u64 ep_info;
+ u32 lower_32_bits;
+ u32 upper_32_bits;
+ u32 reg;
+
+ spin_lock_irqsave(&dwc->lock, flags);
+ reg = DWC3_GDBGLSPMUX_EPSELECT(dep->number);
+ dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
+
+ lower_32_bits = dwc3_readl(dwc->regs, DWC3_GDBGEPINFO0);
+ upper_32_bits = dwc3_readl(dwc->regs, DWC3_GDBGEPINFO1);
+
+ ep_info = ((u64)upper_32_bits << 32) | lower_32_bits;
+ seq_printf(s, "0x%016llx\n", ep_info);
+ spin_unlock_irqrestore(&dwc->lock, flags);
+
+ return 0;
+}
+
DEFINE_SHOW_ATTRIBUTE(dwc3_tx_fifo_size);
DEFINE_SHOW_ATTRIBUTE(dwc3_rx_fifo_size);
DEFINE_SHOW_ATTRIBUTE(dwc3_tx_request_queue);
@@ -692,6 +822,7 @@ DEFINE_SHOW_ATTRIBUTE(dwc3_descriptor_fetch_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_event_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_transfer_type);
DEFINE_SHOW_ATTRIBUTE(dwc3_trb_ring);
+DEFINE_SHOW_ATTRIBUTE(dwc3_ep_info_register);
static const struct dwc3_ep_file_map dwc3_ep_file_map[] = {
{ "tx_fifo_size", &dwc3_tx_fifo_size_fops, },
@@ -703,6 +834,7 @@ static const struct dwc3_ep_file_map dwc3_ep_file_map[] = {
{ "event_queue", &dwc3_event_queue_fops, },
{ "transfer_type", &dwc3_transfer_type_fops, },
{ "trb_ring", &dwc3_trb_ring_fops, },
+ { "GDBGEPINFO", &dwc3_ep_info_register_fops, },
};
static void dwc3_debugfs_create_endpoint_files(struct dwc3_ep *dep,
@@ -750,6 +882,8 @@ void dwc3_debugfs_init(struct dwc3 *dwc)
if (!dwc->regset)
return;
+ dwc->dbg_lsp_select = DWC3_LSP_MUX_UNSELECTED;
+
dwc->regset->regs = dwc3_regs;
dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
dwc->regset->base = dwc->regs - DWC3_GLOBALS_REGS_START;
@@ -759,6 +893,9 @@ void dwc3_debugfs_init(struct dwc3 *dwc)
debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
+ debugfs_create_file("lsp_dump", S_IRUGO | S_IWUSR, root, dwc,
+ &dwc3_lsp_fops);
+
if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
debugfs_create_file("mode", S_IRUGO | S_IWUSR, root, dwc,
&dwc3_mode_fops);