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| author | Robin Murphy <robin.murphy@arm.com> | 2018-02-15 18:51:46 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2018-03-06 17:27:25 +0100 |
| commit | e9c112c94b014b581380d370d3fa2f1d23d07cc0 (patch) | |
| tree | 7f8287695ed266443c30f7d989e79d80933d03bd /drivers/bus | |
| parent | 32837954db462ecc28051923109ef6e4a221f2b2 (diff) | |
| download | linux-0-day-e9c112c94b014b581380d370d3fa2f1d23d07cc0.tar.gz linux-0-day-e9c112c94b014b581380d370d3fa2f1d23d07cc0.tar.xz | |
perf/arm-cci: Untangle global cci_ctrl_base
Depending directly on the bus driver's global cci_ctrl_base variable
is a little unpleasant, and exporting it to allow the PMU driver to
be modular would be even more so. Let's make things a little better
abstracted by adding the control register block to the cci_pmu instance
data alongside the PMU register block, and communicating the mapped
address from the bus driver via platform data.
It's not practical to try the same thing for the bus driver itself,
given that the globals are entangled with the hairy assembly code for
port control, so we leave them be there. It would however be prudent
to move them to the __ro_after_init section in passing, since the
addresses really should never be changing once set.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/arm-cci.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 23dc0b890d0c7..443e4c3fd3579 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -25,9 +25,8 @@ #include <asm/cacheflush.h> #include <asm/smp_plat.h> -/* Referenced read-only by the PMU driver; see drivers/perf/arm-cci.c */ -void __iomem *cci_ctrl_base; -static unsigned long cci_ctrl_phys; +static void __iomem *cci_ctrl_base __ro_after_init; +static unsigned long cci_ctrl_phys __ro_after_init; #ifdef CONFIG_ARM_CCI400_PORT_CTRL struct cci_nb_ports { @@ -56,6 +55,15 @@ static const struct of_device_id arm_cci_matches[] = { {}, }; +static const struct of_dev_auxdata arm_cci_auxdata[] = { + OF_DEV_AUXDATA("arm,cci-400-pmu", 0, NULL, &cci_ctrl_base), + OF_DEV_AUXDATA("arm,cci-400-pmu,r0", 0, NULL, &cci_ctrl_base), + OF_DEV_AUXDATA("arm,cci-400-pmu,r1", 0, NULL, &cci_ctrl_base), + OF_DEV_AUXDATA("arm,cci-500-pmu,r0", 0, NULL, &cci_ctrl_base), + OF_DEV_AUXDATA("arm,cci-550-pmu,r0", 0, NULL, &cci_ctrl_base), + {} +}; + #define DRIVER_NAME "ARM-CCI" static int cci_platform_probe(struct platform_device *pdev) @@ -63,7 +71,8 @@ static int cci_platform_probe(struct platform_device *pdev) if (!cci_probed()) return -ENODEV; - return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); + return of_platform_populate(pdev->dev.of_node, NULL, + arm_cci_auxdata, &pdev->dev); } static struct platform_driver cci_platform_driver = { |