*/
#include <linux/module.h>
#include <linux/init.h>
-#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/ctype.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/edac.h>
#include <linux/smp.h>
+#include <linux/gfp.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
/* we only need the error registers */
r.start += 0xe00;
- if (!devm_request_mem_region(&op->dev, r.start,
- r.end - r.start + 1, pdata->name)) {
+ if (!devm_request_mem_region(&op->dev, r.start, resource_size(&r),
+ pdata->name)) {
printk(KERN_ERR "%s: Error while requesting mem region\n",
__func__);
res = -EBUSY;
goto err;
}
- pdata->pci_vbase = devm_ioremap(&op->dev, r.start,
- r.end - r.start + 1);
+ pdata->pci_vbase = devm_ioremap(&op->dev, r.start, resource_size(&r));
if (!pdata->pci_vbase) {
printk(KERN_ERR "%s: Unable to setup PCI err regs\n", __func__);
res = -ENOMEM;
/**************************** MC Err device ***************************/
+/*
+ * Taken from table 8-55 in the MPC8641 User's Manual and/or 9-61 in the
+ * MPC8572 User's Manual. Each line represents a syndrome bit column as a
+ * 64-bit value, but split into an upper and lower 32-bit chunk. The labels
+ * below correspond to Freescale's manuals.
+ */
+static unsigned int ecc_table[16] = {
+ /* MSB LSB */
+ /* [0:31] [32:63] */
+ 0xf00fe11e, 0xc33c0ff7, /* Syndrome bit 7 */
+ 0x00ff00ff, 0x00fff0ff,
+ 0x0f0f0f0f, 0x0f0fff00,
+ 0x11113333, 0x7777000f,
+ 0x22224444, 0x8888222f,
+ 0x44448888, 0xffff4441,
+ 0x8888ffff, 0x11118882,
+ 0xffff1111, 0x22221114, /* Syndrome bit 0 */
+};
+
+/*
+ * Calculate the correct ECC value for a 64-bit value specified by high:low
+ */
+static u8 calculate_ecc(u32 high, u32 low)
+{
+ u32 mask_low;
+ u32 mask_high;
+ int bit_cnt;
+ u8 ecc = 0;
+ int i;
+ int j;
+
+ for (i = 0; i < 8; i++) {
+ mask_high = ecc_table[i * 2];
+ mask_low = ecc_table[i * 2 + 1];
+ bit_cnt = 0;
+
+ for (j = 0; j < 32; j++) {
+ if ((mask_high >> j) & 1)
+ bit_cnt ^= (high >> j) & 1;
+ if ((mask_low >> j) & 1)
+ bit_cnt ^= (low >> j) & 1;
+ }
+
+ ecc |= bit_cnt << i;
+ }
+
+ return ecc;
+}
+
+/*
+ * Create the syndrome code which is generated if the data line specified by
+ * 'bit' failed. Eg generate an 8-bit codes seen in Table 8-55 in the MPC8641
+ * User's Manual and 9-61 in the MPC8572 User's Manual.
+ */
+static u8 syndrome_from_bit(unsigned int bit) {
+ int i;
+ u8 syndrome = 0;
+
+ /*
+ * Cycle through the upper or lower 32-bit portion of each value in
+ * ecc_table depending on if 'bit' is in the upper or lower half of
+ * 64-bit data.
+ */
+ for (i = bit < 32; i < 16; i += 2)
+ syndrome |= ((ecc_table[i] >> (bit % 32)) & 1) << (i / 2);
+
+ return syndrome;
+}
+
+/*
+ * Decode data and ecc syndrome to determine what went wrong
+ * Note: This can only decode single-bit errors
+ */
+static void sbe_ecc_decode(u32 cap_high, u32 cap_low, u32 cap_ecc,
+ int *bad_data_bit, int *bad_ecc_bit)
+{
+ int i;
+ u8 syndrome;
+
+ *bad_data_bit = -1;
+ *bad_ecc_bit = -1;
+
+ /*
+ * Calculate the ECC of the captured data and XOR it with the captured
+ * ECC to find an ECC syndrome value we can search for
+ */
+ syndrome = calculate_ecc(cap_high, cap_low) ^ cap_ecc;
+
+ /* Check if a data line is stuck... */
+ for (i = 0; i < 64; i++) {
+ if (syndrome == syndrome_from_bit(i)) {
+ *bad_data_bit = i;
+ return;
+ }
+ }
+
+ /* If data is correct, check ECC bits for errors... */
+ for (i = 0; i < 8; i++) {
+ if ((syndrome >> i) & 0x1) {
+ *bad_ecc_bit = i;
+ return;
+ }
+ }
+}
+
static void mpc85xx_mc_check(struct mem_ctl_info *mci)
{
struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
struct csrow_info *csrow;
+ u32 bus_width;
u32 err_detect;
u32 syndrome;
u32 err_addr;
u32 pfn;
int row_index;
+ u32 cap_high;
+ u32 cap_low;
+ int bad_data_bit;
+ int bad_ecc_bit;
err_detect = in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT);
if (!err_detect)
}
syndrome = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ECC);
+
+ /* Mask off appropriate bits of syndrome based on bus width */
+ bus_width = (in_be32(pdata->mc_vbase + MPC85XX_MC_DDR_SDRAM_CFG) &
+ DSC_DBW_MASK) ? 32 : 64;
+ if (bus_width == 64)
+ syndrome &= 0xff;
+ else
+ syndrome &= 0xffff;
+
err_addr = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_ADDRESS);
pfn = err_addr >> PAGE_SHIFT;
break;
}
- mpc85xx_mc_printk(mci, KERN_ERR, "Capture Data High: %#8.8x\n",
- in_be32(pdata->mc_vbase +
- MPC85XX_MC_CAPTURE_DATA_HI));
- mpc85xx_mc_printk(mci, KERN_ERR, "Capture Data Low: %#8.8x\n",
- in_be32(pdata->mc_vbase +
- MPC85XX_MC_CAPTURE_DATA_LO));
- mpc85xx_mc_printk(mci, KERN_ERR, "syndrome: %#8.8x\n", syndrome);
- mpc85xx_mc_printk(mci, KERN_ERR, "err addr: %#8.8x\n", err_addr);
+ cap_high = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_DATA_HI);
+ cap_low = in_be32(pdata->mc_vbase + MPC85XX_MC_CAPTURE_DATA_LO);
+
+ /*
+ * Analyze single-bit errors on 64-bit wide buses
+ * TODO: Add support for 32-bit wide buses
+ */
+ if ((err_detect & DDR_EDE_SBE) && (bus_width == 64)) {
+ sbe_ecc_decode(cap_high, cap_low, syndrome,
+ &bad_data_bit, &bad_ecc_bit);
+
+ if (bad_data_bit != -1)
+ mpc85xx_mc_printk(mci, KERN_ERR,
+ "Faulty Data bit: %d\n", bad_data_bit);
+ if (bad_ecc_bit != -1)
+ mpc85xx_mc_printk(mci, KERN_ERR,
+ "Faulty ECC bit: %d\n", bad_ecc_bit);
+
+ mpc85xx_mc_printk(mci, KERN_ERR,
+ "Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
+ cap_high ^ (1 << (bad_data_bit - 32)),
+ cap_low ^ (1 << bad_data_bit),
+ syndrome ^ (1 << bad_ecc_bit));
+ }
+
+ mpc85xx_mc_printk(mci, KERN_ERR,
+ "Captured Data / ECC:\t%#8.8x_%08x / %#2.2x\n",
+ cap_high, cap_low, syndrome);
+ mpc85xx_mc_printk(mci, KERN_ERR, "Err addr: %#8.8x\n", err_addr);
mpc85xx_mc_printk(mci, KERN_ERR, "PFN: %#8.8x\n", pfn);
/* we are out of range */
end <<= (24 - PAGE_SHIFT);
end |= (1 << (24 - PAGE_SHIFT)) - 1;
- csrow->first_page = start >> PAGE_SHIFT;
- csrow->last_page = end >> PAGE_SHIFT;
+ csrow->first_page = start;
+ csrow->last_page = end;
csrow->nr_pages = end + 1 - start;
csrow->grain = 8;
csrow->mtype = mtype;
mpc85xx_init_csrows(mci);
-#ifdef CONFIG_EDAC_DEBUG
- edac_mc_register_mcidev_debug((struct attribute **)debug_attr);
-#endif
-
/* store the original error disable bits */
orig_ddr_err_disable =
in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DISABLE);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff