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platform/x86/intel/pmc: Cleanup SSRAM discovery

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Clean up the code handling SSRAM discovery. Handle all resource allocation
and cleanup in pmc_core_ssram_get_pmc(). Return the error status from this
function but only fail the init if we fail to discover the primary PMC.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-14-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
David E. Box 2023-11-29 14:21:25 -08:00 • committed by Hans de Goede
parent 9512920a6b
commit a01486dc4b
1 changed files with 33 additions and 29 deletions
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62
drivers/platform/x86/intel/pmc/core_ssram.c
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@ -8,6 +8,7 @@
*
*/
#include <linux/cleanup.h>
#include <linux/pci.h>
#include <linux/io-64-nonatomic-lo-hi.h>
@ -21,6 +22,8 @@
#define SSRAM_IOE_OFFSET 0x68
#define SSRAM_DEVID_OFFSET 0x70
DEFINE_FREE(pmc_core_iounmap, void __iomem *, iounmap(_T));
static const struct pmc_reg_map *pmc_core_find_regmap(struct pmc_info *list, u16 devid)
{
for (; list->map; ++list)
@ -65,44 +68,49 @@ pmc_core_pmc_add(struct pmc_dev *pmcdev, u64 pwrm_base,
return 0;
}
static void
pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, void __iomem *ssram, u32 offset,
int pmc_idx)
static int
pmc_core_ssram_get_pmc(struct pmc_dev *pmcdev, int pmc_idx, u32 offset)
{
u64 pwrm_base;
struct pci_dev *ssram_pcidev = pmcdev->ssram_pcidev;
void __iomem __free(pmc_core_iounmap) *tmp_ssram = NULL;
void __iomem __free(pmc_core_iounmap) *ssram = NULL;
const struct pmc_reg_map *map;
u64 ssram_base, pwrm_base;
u16 devid;
if (pmc_idx != PMC_IDX_SOC) {
u64 ssram_base = get_base(ssram, offset);
if (!pmcdev->regmap_list)
return -ENOENT;
if (!ssram_base)
return;
ssram_base = ssram_pcidev->resource[0].start;
tmp_ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
if (pmc_idx != PMC_IDX_MAIN) {
/*
* The secondary PMC BARS (which are behind hidden PCI devices)
* are read from fixed offsets in MMIO of the primary PMC BAR.
*/
ssram_base = get_base(tmp_ssram, offset);
ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
if (!ssram)
return;
return -ENOMEM;
} else {
ssram = no_free_ptr(tmp_ssram);
}
pwrm_base = get_base(ssram, SSRAM_PWRM_OFFSET);
devid = readw(ssram + SSRAM_DEVID_OFFSET);
if (pmcdev->regmap_list) {
const struct pmc_reg_map *map;
map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
if (!map)
return -ENODEV;
map = pmc_core_find_regmap(pmcdev->regmap_list, devid);
if (map)
pmc_core_pmc_add(pmcdev, pwrm_base, map, pmc_idx);
}
if (pmc_idx != PMC_IDX_SOC)
iounmap(ssram);
return pmc_core_pmc_add(pmcdev, pwrm_base, map, PMC_IDX_MAIN);
}
int pmc_core_ssram_init(struct pmc_dev *pmcdev)
{
void __iomem *ssram;
struct pci_dev *pcidev;
u64 ssram_base;
int ret;
pcidev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(20, 2));
@ -113,18 +121,14 @@ int pmc_core_ssram_init(struct pmc_dev *pmcdev)
if (ret)
goto release_dev;
ssram_base = pcidev->resource[0].start;
ssram = ioremap(ssram_base, SSRAM_HDR_SIZE);
if (!ssram)
goto disable_dev;
pmcdev->ssram_pcidev = pcidev;
pmc_core_ssram_get_pmc(pmcdev, ssram, 0, PMC_IDX_SOC);
pmc_core_ssram_get_pmc(pmcdev, ssram, SSRAM_IOE_OFFSET, PMC_IDX_IOE);
pmc_core_ssram_get_pmc(pmcdev, ssram, SSRAM_PCH_OFFSET, PMC_IDX_PCH);
ret = pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_MAIN, 0);
if (ret)
goto disable_dev;
iounmap(ssram);
pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_IOE, SSRAM_IOE_OFFSET);
pmc_core_ssram_get_pmc(pmcdev, PMC_IDX_PCH, SSRAM_PCH_OFFSET);
return 0;