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

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Message-ID: <1424685554.2340.2.camel@mm-sol.com>
Date:	Mon, 23 Feb 2015 11:59:14 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Gilad Avidov <gavidov@...eaurora.org>
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 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.

> +                                                                                               
> 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
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