atmel-mci: debugfs support
Create additional files under the host's debugfs directory containing additional host-specific debug information. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Haavard Skinnemoen
Pierre Ossman
parent
f4b7f927b5
commit
deec9ae31e
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@ -82,6 +82,8 @@
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# define MCI_OVRE ( 1 << 30) /* RX Overrun Error */
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# define MCI_UNRE ( 1 << 31) /* TX Underrun Error */
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#define MCI_REGS_SIZE 0x100
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/* Register access macros */
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#define mci_readl(port,reg) \
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__raw_readl((port)->regs + MCI_##reg)
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@ -9,6 +9,7 @@
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*/
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#include <linux/blkdev.h>
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#include <linux/clk.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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@ -16,6 +17,8 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/scatterlist.h>
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#include <linux/seq_file.h>
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#include <linux/stat.h>
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#include <linux/mmc/host.h>
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@ -88,6 +91,188 @@ struct atmel_mci {
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#define atmci_clear_pending(host, event) \
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clear_bit(event, &host->pending_events)
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/*
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* The debugfs stuff below is mostly optimized away when
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* CONFIG_DEBUG_FS is not set.
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*/
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static int atmci_req_show(struct seq_file *s, void *v)
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{
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struct atmel_mci *host = s->private;
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struct mmc_request *mrq = host->mrq;
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struct mmc_command *cmd;
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struct mmc_command *stop;
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struct mmc_data *data;
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/* Make sure we get a consistent snapshot */
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spin_lock_irq(&host->mmc->lock);
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if (mrq) {
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cmd = mrq->cmd;
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data = mrq->data;
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stop = mrq->stop;
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if (cmd)
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seq_printf(s,
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"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
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cmd->opcode, cmd->arg, cmd->flags,
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cmd->resp[0], cmd->resp[1], cmd->resp[2],
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cmd->resp[2], cmd->error);
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if (data)
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seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
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data->bytes_xfered, data->blocks,
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data->blksz, data->flags, data->error);
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if (stop)
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seq_printf(s,
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"CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
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stop->opcode, stop->arg, stop->flags,
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stop->resp[0], stop->resp[1], stop->resp[2],
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stop->resp[2], stop->error);
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}
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spin_unlock_irq(&host->mmc->lock);
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return 0;
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}
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static int atmci_req_open(struct inode *inode, struct file *file)
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{
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return single_open(file, atmci_req_show, inode->i_private);
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}
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static const struct file_operations atmci_req_fops = {
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.owner = THIS_MODULE,
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.open = atmci_req_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void atmci_show_status_reg(struct seq_file *s,
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const char *regname, u32 value)
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{
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static const char *sr_bit[] = {
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[0] = "CMDRDY",
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[1] = "RXRDY",
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[2] = "TXRDY",
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[3] = "BLKE",
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[4] = "DTIP",
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[5] = "NOTBUSY",
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[8] = "SDIOIRQA",
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[9] = "SDIOIRQB",
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[16] = "RINDE",
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[17] = "RDIRE",
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[18] = "RCRCE",
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[19] = "RENDE",
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[20] = "RTOE",
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[21] = "DCRCE",
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[22] = "DTOE",
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[30] = "OVRE",
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[31] = "UNRE",
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};
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unsigned int i;
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seq_printf(s, "%s:\t0x%08x", regname, value);
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for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
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if (value & (1 << i)) {
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if (sr_bit[i])
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seq_printf(s, " %s", sr_bit[i]);
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else
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seq_puts(s, " UNKNOWN");
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}
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}
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seq_putc(s, '\n');
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}
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static int atmci_regs_show(struct seq_file *s, void *v)
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{
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struct atmel_mci *host = s->private;
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u32 *buf;
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buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* Grab a more or less consistent snapshot */
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spin_lock_irq(&host->mmc->lock);
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memcpy_fromio(buf, host->regs, MCI_REGS_SIZE);
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spin_unlock_irq(&host->mmc->lock);
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seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n",
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buf[MCI_MR / 4],
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buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "",
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buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "",
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buf[MCI_MR / 4] & 0xff);
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seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]);
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seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]);
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seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]);
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seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
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buf[MCI_BLKR / 4],
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buf[MCI_BLKR / 4] & 0xffff,
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(buf[MCI_BLKR / 4] >> 16) & 0xffff);
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/* Don't read RSPR and RDR; it will consume the data there */
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atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]);
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atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]);
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return 0;
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}
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static int atmci_regs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, atmci_regs_show, inode->i_private);
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}
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static const struct file_operations atmci_regs_fops = {
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.owner = THIS_MODULE,
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.open = atmci_regs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void atmci_init_debugfs(struct atmel_mci *host)
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{
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struct mmc_host *mmc;
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struct dentry *root;
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struct dentry *node;
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struct resource *res;
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mmc = host->mmc;
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root = mmc->debugfs_root;
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if (!root)
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return;
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node = debugfs_create_file("regs", S_IRUSR, root, host,
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&atmci_regs_fops);
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if (IS_ERR(node))
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return;
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if (!node)
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goto err;
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res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0);
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node->d_inode->i_size = res->end - res->start + 1;
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node = debugfs_create_file("req", S_IRUSR, root, host, &atmci_req_fops);
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if (!node)
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goto err;
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node = debugfs_create_x32("pending_events", S_IRUSR, root,
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(u32 *)&host->pending_events);
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if (!node)
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goto err;
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node = debugfs_create_x32("completed_events", S_IRUSR, root,
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(u32 *)&host->completed_events);
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if (!node)
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goto err;
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return;
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err:
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dev_err(&host->pdev->dev,
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"failed to initialize debugfs for controller\n");
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}
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static void atmci_enable(struct atmel_mci *host)
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{
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@ -905,6 +1090,8 @@ static int __init atmci_probe(struct platform_device *pdev)
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"Atmel MCI controller at 0x%08lx irq %d\n",
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host->mapbase, irq);
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atmci_init_debugfs(host);
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return 0;
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err_request_irq:
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@ -923,6 +1110,8 @@ static int __exit atmci_remove(struct platform_device *pdev)
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platform_set_drvdata(pdev, NULL);
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if (host) {
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/* Debugfs stuff is cleaned up by mmc core */
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if (host->detect_pin >= 0) {
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int pin = host->detect_pin;
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