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author | Faiz Abbas <faiz_abbas@ti.com> | 2018-07-09 22:18:39 +0530 |
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committer | Tony Lindgren <tony@atomide.com> | 2018-07-09 22:31:38 -0700 |
commit | 596e7955692b5d8b042fca500b7a83c25dfcf936 (patch) | |
tree | e2b297da532c8c14ec61b0c2ad59f159ad4801c7 /drivers/bus/ti-sysc.c | |
parent | 7f35e63dbfcb627bd30bac45702ffdf1ddde1516 (diff) | |
download | linux-596e7955692b5d8b042fca500b7a83c25dfcf936.tar.gz linux-596e7955692b5d8b042fca500b7a83c25dfcf936.tar.bz2 linux-596e7955692b5d8b042fca500b7a83c25dfcf936.zip |
bus: ti-sysc: Add support for software reset
Add support for the software reset of a target interconnect
module using its sysconfig and sysstatus registers.
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
[tony@atomide.com: updated to check if sysconfig exists]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/bus/ti-sysc.c')
-rw-r--r-- | drivers/bus/ti-sysc.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index c9db5369e2ec..c9bac9dc4637 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -23,11 +23,14 @@ #include <linux/of_address.h> #include <linux/of_platform.h> #include <linux/slab.h> +#include <linux/iopoll.h> #include <linux/platform_data/ti-sysc.h> #include <dt-bindings/bus/ti-sysc.h> +#define MAX_MODULE_SOFTRESET_WAIT 10000 + static const char * const reg_names[] = { "rev", "sysc", "syss", }; enum sysc_clocks { @@ -88,6 +91,11 @@ struct sysc { struct delayed_work idle_work; }; +void sysc_write(struct sysc *ddata, int offset, u32 value) +{ + writel_relaxed(value, ddata->module_va + offset); +} + static u32 sysc_read(struct sysc *ddata, int offset) { if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) { @@ -943,6 +951,36 @@ static void sysc_init_revision_quirks(struct sysc *ddata) } } +static int sysc_reset(struct sysc *ddata) +{ + int offset = ddata->offsets[SYSC_SYSCONFIG]; + int val; + + if (ddata->legacy_mode || offset < 0 || + ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT) + return 0; + + /* + * Currently only support reset status in sysstatus. + * Warn and return error in all other cases + */ + if (!ddata->cfg.syss_mask) { + dev_err(ddata->dev, "No ti,syss-mask. Reset failed\n"); + return -EINVAL; + } + + val = sysc_read(ddata, offset); + val |= (0x1 << ddata->cap->regbits->srst_shift); + sysc_write(ddata, offset, val); + + /* Poll on reset status */ + offset = ddata->offsets[SYSC_SYSSTATUS]; + + return readl_poll_timeout(ddata->module_va + offset, val, + (val & ddata->cfg.syss_mask) == 0x0, + 100, MAX_MODULE_SOFTRESET_WAIT); +} + /* At this point the module is configured enough to read the revision */ static int sysc_init_module(struct sysc *ddata) { @@ -960,6 +998,14 @@ static int sysc_init_module(struct sysc *ddata) return 0; } + error = sysc_reset(ddata); + if (error) { + dev_err(ddata->dev, "Reset failed with %d\n", error); + pm_runtime_put_sync(ddata->dev); + + return error; + } + ddata->revision = sysc_read_revision(ddata); pm_runtime_put_sync(ddata->dev); |