diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2012-10-16 22:39:09 (GMT) |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2012-12-12 15:48:49 (GMT) |
commit | f65aad41772f6a0022e9763fe06f47604449964c (patch) | |
tree | 701d6ea74ac0c41f008c5554d876945fe4caf512 /drivers/edac/octeon_edac-l2c.c | |
parent | aa1762f49c81a14d0453e4f67f922e4f155510a3 (diff) | |
download | linux-f65aad41772f6a0022e9763fe06f47604449964c.tar.xz |
MIPS: Cavium: Add EDAC support.
Drivers for EDAC on Cavium. Supported subsystems are:
o CPU primary caches. These are parity protected only, so only error
reporting.
o Second level cache - ECC protected, provides SECDED.
o Memory: ECC / SECDEC if used with suitable DRAM modules. The driver will
will only initialize if ECC is enabled on a system so is safe to run on
non-ECC memory.
o PCI: Parity error reporting
Since it is very hard to test this sort of code the implementation is very
conservative and uses polling where possible for now.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Reviewed-by: Borislav Petkov <borislav.petkov@amd.com>
Diffstat (limited to 'drivers/edac/octeon_edac-l2c.c')
-rw-r--r-- | drivers/edac/octeon_edac-l2c.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/edac/octeon_edac-l2c.c b/drivers/edac/octeon_edac-l2c.c new file mode 100644 index 0000000..5f459aa --- /dev/null +++ b/drivers/edac/octeon_edac-l2c.c @@ -0,0 +1,118 @@ +/* + * 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. + * + * Copyright (C) 2009 Wind River Systems, + * written by Ralf Baechle <ralf@linux-mips.org> + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/edac.h> + +#include <asm/octeon/cvmx.h> + +#include "edac_core.h" +#include "edac_module.h" + +#define EDAC_MOD_STR "octeon-l2c" + +static void co_l2c_poll(struct edac_device_ctl_info *l2c) +{ + union cvmx_l2t_err l2t_err; + + l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR); + if (l2t_err.s.sec_err) { + edac_device_handle_ce(l2c, 0, 0, + "Single bit error (corrected)"); + l2t_err.s.sec_err = 1; /* Reset */ + cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64); + } + if (l2t_err.s.ded_err) { + edac_device_handle_ue(l2c, 0, 0, + "Double bit error (corrected)"); + l2t_err.s.ded_err = 1; /* Reset */ + cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64); + } +} + +static int __devinit co_l2c_probe(struct platform_device *pdev) +{ + struct edac_device_ctl_info *l2c; + union cvmx_l2t_err l2t_err; + int res = 0; + + l2c = edac_device_alloc_ctl_info(0, "l2c", 1, NULL, 0, 0, + NULL, 0, edac_device_alloc_index()); + if (!l2c) + return -ENOMEM; + + l2c->dev = &pdev->dev; + platform_set_drvdata(pdev, l2c); + l2c->dev_name = dev_name(&pdev->dev); + + l2c->mod_name = "octeon-l2c"; + l2c->ctl_name = "octeon_l2c_err"; + l2c->edac_check = co_l2c_poll; + + if (edac_device_add_device(l2c) > 0) { + pr_err("%s: edac_device_add_device() failed\n", __func__); + goto err; + } + + l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR); + l2t_err.s.sec_intena = 0; /* We poll */ + l2t_err.s.ded_intena = 0; + l2t_err.s.sec_err = 1; /* Clear, just in case */ + l2t_err.s.ded_err = 1; + cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64); + + return 0; + +err: + edac_device_free_ctl_info(l2c); + + return res; +} + +static int co_l2c_remove(struct platform_device *pdev) +{ + struct edac_device_ctl_info *l2c = platform_get_drvdata(pdev); + + edac_device_del_device(&pdev->dev); + edac_device_free_ctl_info(l2c); + + return 0; +} + +static struct platform_driver co_l2c_driver = { + .probe = co_l2c_probe, + .remove = co_l2c_remove, + .driver = { + .name = "co_l2c_edac", + } +}; + +static int __init co_edac_init(void) +{ + int ret; + + ret = platform_driver_register(&co_l2c_driver); + if (ret) + pr_warning(EDAC_MOD_STR " EDAC failed to register\n"); + + return ret; +} + +static void __exit co_edac_exit(void) +{ + platform_driver_unregister(&co_l2c_driver); +} + +module_init(co_edac_init); +module_exit(co_edac_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>"); |