linux-kernel - Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

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Message-ID: <20150311174312.0d20fb10@gavidov-lnx.qualcomm.com>
Date:	Wed, 11 Mar 2015 17:43:12 -0600
From:	Gilad Avidov <gavidov@...eaurora.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	sdharia@...eaurora.org, mlocke@...eaurora.org,
	linux-arm-msm@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, galak@...eaurora.org,
	agross@...eaurora.org
Subject: Re: [PATCH V4 2/2] spmi: pmic_arb: add support for hw version 2

Hi Ivan,

On Mon, 23 Feb 2015 11:59:14 +0200
"Ivan T. Ivanov" <iivanov@...sol.com> wrote:

> Hi Gilad,
> 
> On Thu, 2015-02-19 at 15:54 -0700, Gilad Avidov wrote:
> > Qualcomm PMIC Arbiter version-2 changes from version-1 are:
> > 
> > - Some different register offsets.
> > - New channel register space, one per PMIC peripheral (ppid).
> >   All tx traffic uses these channels.
> > - New observer register space. All rx trafic uses this space.
> > - Different command format for spmi command registers.
> > 
> > Acked-by: Sagar Dharia <sdharia@...eaurora.org>
> > Signed-off-by: Gilad Avidov <gavidov@...eaurora.org
> > 
> 
> <snip>
> 
> > @@ -645,12 +796,67 @@ static int spmi_pmic_arb_probe(struct
> > platform_device *pdev) pa->spmic = ctrl;
> > 
> >         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "core");
> > -       pa->base = devm_ioremap_resource(&ctrl->dev, res);
> > -       if (IS_ERR(pa->base)) {
> > -               err = PTR_ERR(pa->base);
> > +       core = devm_ioremap_resource(&ctrl->dev, res);
> > +       if (IS_ERR(core)) {
> > +               err = PTR_ERR(core);
> >                 goto err_put_ctrl;
> >         }
> > 
> > +       hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
> > +       is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
> > +
> > +       dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n",
> > (is_v1 ? 1 : 2),
> > +               hw_ver);
> > +
> > +       if (is_v1) {
> > +               pa->ver_ops = &pmic_arb_v1;
> > +               pa->wr_base = core;
> > +               pa->rd_base = core;
> > +       } else {
> > +               u8  chan;
> > +               u16 ppid;
> > +               u32 regval;
> > +
> > +               pa->ver_ops = &pmic_arb_v2;
> > +               devm_iounmap(&ctrl->dev, core);
> > +
> > +               pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
> > +                                       PPID_TO_CHAN_TABLE_SZ,
> > GFP_KERNEL);
> > +               if (!pa->ppid_to_chan) {
> > +                       err = -ENOMEM;
> > +                       goto err_put_ctrl;
> > +               }
> > +               /*
> > +                       * PMIC_ARB_REG_CHNL is a table in HW
> > mapping channel to ppid.
> > +                       * ppid_to_chan is an in-memory invert of
> > that table.
> > +                       */
> > +               for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
> > +                       regval = readl_relaxed(pa->rd_base +
> 
> rd_base is not initialized at this point.

correct.

> 
> > +                                                                                               
> > PMIC_ARB_REG_CHNL(chan));
> > +                       if (!regval)
> > +                               continue;
> > +
> > +                       ppid = (regval >> 8) & 0xFFF;
> > +                       pa->ppid_to_chan[ppid] = chan;
> > +               }
> > +
> > +               res = platform_get_resource_byname(pdev,
> > IORESOURCE_MEM,
> > +
> > "obsrvr");
> > +               pa->rd_base = devm_ioremap_resource(&ctrl->dev,
> > res);
> 
> and they are compile warnings:
> 
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_read_cmd’:
> drivers/spmi/spmi-pmic-arb.c:310:4: warning: format ‘%d’ expects
> argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
> PMIC_ARB_MAX_TRANS_BYTES, len); ^
> drivers/spmi/spmi-pmic-arb.c: In function ‘pmic_arb_write_cmd’:
> drivers/spmi/spmi-pmic-arb.c:357:4: warning: format ‘%d’ expects
> argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat=]
> PMIC_ARB_MAX_TRANS_BYTES, len); ^
> 
> Ivan

Sorry about that. I'll fix it.

Thanks,
Gilad
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