serial: pch_uart: add debugfs hook for register dump
This driver will be use as interfaces for multiple kinds of devices like Bluetooth/GPS etc, this debug hook will make driver debugging much easier. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -29,6 +29,7 @@
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#include <linux/nmi.h>
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#include <linux/delay.h>
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#include <linux/debugfs.h>
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#include <linux/dmaengine.h>
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#include <linux/pch_dma.h>
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@ -144,6 +145,8 @@ enum {
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#define PCH_UART_DLL 0x00
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#define PCH_UART_DLM 0x01
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#define PCH_UART_BRCSR 0x0E
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#define PCH_UART_IID_RLS (PCH_UART_IIR_REI)
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#define PCH_UART_IID_RDR (PCH_UART_IIR_RRI)
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#define PCH_UART_IID_RDR_TO (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
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@ -243,6 +246,8 @@ struct eg20t_port {
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int tx_dma_use;
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void *rx_buf_virt;
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dma_addr_t rx_buf_dma;
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struct dentry *debugfs;
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};
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/**
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@ -292,6 +297,73 @@ static const int trigger_level_64[4] = { 1, 16, 32, 56 };
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static const int trigger_level_16[4] = { 1, 4, 8, 14 };
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static const int trigger_level_1[4] = { 1, 1, 1, 1 };
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#ifdef CONFIG_DEBUG_FS
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#define PCH_REGS_BUFSIZE 1024
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static int pch_show_regs_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static ssize_t port_show_regs(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct eg20t_port *priv = file->private_data;
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char *buf;
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u32 len = 0;
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ssize_t ret;
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unsigned char lcr;
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buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
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if (!buf)
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return 0;
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"PCH EG20T port[%d] regs:\n", priv->port.line);
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"=================================\n");
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"BRCSR: \t0x%02x\n",
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ioread8(priv->membase + PCH_UART_BRCSR));
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lcr = ioread8(priv->membase + UART_LCR);
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iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
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len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
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"DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
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iowrite8(lcr, priv->membase + UART_LCR);
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if (len > PCH_REGS_BUFSIZE)
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len = PCH_REGS_BUFSIZE;
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ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
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kfree(buf);
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return ret;
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}
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static const struct file_operations port_regs_ops = {
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.owner = THIS_MODULE,
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.open = pch_show_regs_open,
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.read = port_show_regs,
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.llseek = default_llseek,
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};
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#endif /* CONFIG_DEBUG_FS */
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static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
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int base_baud)
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{
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@ -1554,6 +1626,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
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int port_type;
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struct pch_uart_driver_data *board;
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const char *board_name;
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char name[32]; /* for debugfs file name */
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board = &drv_dat[id->driver_data];
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port_type = board->port_type;
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@ -1623,6 +1696,12 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
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if (ret < 0)
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goto init_port_hal_free;
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#ifdef CONFIG_DEBUG_FS
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snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
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priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
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NULL, priv, &port_regs_ops);
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#endif
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return priv;
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init_port_hal_free:
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@ -1639,6 +1718,11 @@ init_port_alloc_err:
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static void pch_uart_exit_port(struct eg20t_port *priv)
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{
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#ifdef CONFIG_DEBUG_FS
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if (priv->debugfs)
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debugfs_remove(priv->debugfs);
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#endif
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uart_remove_one_port(&pch_uart_driver, &priv->port);
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pci_set_drvdata(priv->pdev, NULL);
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free_page((unsigned long)priv->rxbuf.buf);
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