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Date: Sat, 7 Oct 2017 09:45:39 +0200
From: Jonathan Neuschäfer <j.neuschaefer@....net>
To: srinivas.kandagatla@...aro.org
Cc: gregkh@...uxfoundation.org, broonie@...nel.org,
alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
poeschel@...onage.de, treding@...dia.com,
gong.chen@...ux.intel.com, andreas.noever@...il.com,
alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
davem@...emloft.net, james.hogan@...tec.com,
michael.opdenacker@...e-electrons.com, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
kheitke@...ience.com, linux-arm-msm@...r.kernel.org, arnd@...db.de
Subject: Re: [Patch v6 3/7] slimbus: qcom: Add Qualcomm Slimbus controller
driver
Hi,
On Fri, Oct 06, 2017 at 05:51:32PM +0200, srinivas.kandagatla@...aro.org wrote:
> From: Sagar Dharia <sdharia@...eaurora.org>
>
> This controller driver programs manager, interface, and framer
> devices for Qualcomm's slimbus HW block.
> Manager component currently implements logical address setting,
> and messaging interface.
> Interface device reports bus synchronization information, and framer
> device clocks the bus from the time it's woken up, until clock-pause
> is executed by the manager device.
>
> Signed-off-by: Sagar Dharia <sdharia@...eaurora.org>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
> .../devicetree/bindings/slimbus/slim-qcom-ctrl.txt | 43 ++
> drivers/slimbus/Kconfig | 9 +
> drivers/slimbus/Makefile | 3 +
> drivers/slimbus/slim-qcom-ctrl.c | 594 +++++++++++++++++++++
> drivers/slimbus/slim-qcom.h | 63 +++
> 5 files changed, 712 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
> create mode 100644 drivers/slimbus/slim-qcom-ctrl.c
> create mode 100644 drivers/slimbus/slim-qcom.h
>
> diff --git a/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt b/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
> new file mode 100644
> index 0000000..081110d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/slimbus/slim-qcom-ctrl.txt
> @@ -0,0 +1,43 @@
> +Qualcomm SLIMBUS controller
> +This controller is used if applications processor driver controls slimbus
> +master component.
> +
> +Required properties:
> +
> + - #address-cells - refer to Documentation/devicetree/bindings/slimbus/bus.txt
> + - #size-cells - refer to Documentation/devicetree/bindings/slimbus/bus.txt
> +
> + - reg : Offset and length of the register region(s) for the device
> + - reg-names : Register region name(s) referenced in reg above
> + Required register resource entries are:
> + "ctrl": Physical adderess of controller register blocks
s/adderess/address/
> + - compatible : should be "qcom,<SOC-NAME>-slim" for SOC specific compatible or
> + "qcom,slim" if using generic qcom SLIM IP.
> + - interrupts : Interrupt number used by this controller
> + - clocks : Interface and core clocks used by this slimbus controller
> + - clock-names : Required clock-name entries are:
> + "iface_clk" : Interface clock for this controller
> + "core_clk" : Interrupt for controller core's BAM
[...]
> +static irqreturn_t msm_slim_interrupt(int irq, void *d)
> +{
> + struct msm_slim_ctrl *dev = d;
> + u32 stat = readl_relaxed(dev->base + MGR_INT_STAT);
> + int err = 0, ret = IRQ_NONE;
> +
> + if (stat & MGR_INT_TX_MSG_SENT || stat & MGR_INT_TX_NACKED_2) {
> + if (stat & MGR_INT_TX_MSG_SENT)
> + writel_relaxed(MGR_INT_TX_MSG_SENT,
> + dev->base + MGR_INT_CLR);
> + if (stat & MGR_INT_TX_NACKED_2) {
> + u32 mgr_stat = readl_relaxed(dev->base + MGR_STATUS);
> + u32 mgr_ie_stat = readl_relaxed(dev->base +
> + MGR_IE_STAT);
> + u32 frm_stat = readl_relaxed(dev->base + FRM_STAT);
> + u32 frm_cfg = readl_relaxed(dev->base + FRM_CFG);
> + u32 frm_intr_stat = readl_relaxed(dev->base +
> + FRM_INT_STAT);
> + u32 frm_ie_stat = readl_relaxed(dev->base +
> + FRM_IE_STAT);
> + u32 intf_stat = readl_relaxed(dev->base + INTF_STAT);
> + u32 intf_intr_stat = readl_relaxed(dev->base +
> + INTF_INT_STAT);
> + u32 intf_ie_stat = readl_relaxed(dev->base +
> + INTF_IE_STAT);
> +
> + writel_relaxed(MGR_INT_TX_NACKED_2, dev->base +
> + MGR_INT_CLR);
> + dev_err(dev->dev, "TX Nack MGR:int:0x%x, stat:0x%x\n",
> + stat, mgr_stat);
> + dev_err(dev->dev, "TX Nack MGR:ie:0x%x\n", mgr_ie_stat);
> + dev_err(dev->dev, "TX Nack FRM:int:0x%x, stat:0x%x\n",
> + frm_intr_stat, frm_stat);
> + dev_err(dev->dev, "TX Nack FRM:cfg:0x%x, ie:0x%x\n",
> + frm_cfg, frm_ie_stat);
> + dev_err(dev->dev, "TX Nack INTF:intr:0x%x, stat:0x%x\n",
> + intf_intr_stat, intf_stat);
> + dev_err(dev->dev, "TX Nack INTF:ie:0x%x\n",
> + intf_ie_stat);
> + err = -ENOTCONN;
> + }
> + /**
This isn't really a kerneldoc comment…
> + * Guarantee that interrupt clear bit write goes through before
> + * signalling completion/exiting ISR
> + */
> + mb();
> + slim_return_tx(&dev->ctrl, err);
> + ret = IRQ_HANDLED;
> + }
> + if (stat & MGR_INT_RX_MSG_RCVD) {
> + u8 mc, mt;
> + u8 len, i;
> + u32 *rx_buf, pkt[10];
> + bool q_rx = false;
> +
> + pkt[0] = readl_relaxed(dev->base + MGR_RX_MSG);
> + mt = (pkt[0] >> 5) & 0x7;
> + mc = (pkt[0] >> 8) & 0xff;
> + len = pkt[0] & 0x1F;
> + dev_dbg(dev->dev, "RX-IRQ: MC: %x, MT: %x\n", mc, mt);
> +
> + /**
ditto
> + * this message cannot be handled by ISR, so
> + * let work-queue handle it
> + */
> + if (mt == SLIM_MSG_MT_CORE &&
> + mc == SLIM_MSG_MC_REPORT_PRESENT)
> + rx_buf = (u32 *)slim_get_rx(&dev->ctrl);
> + else
> + rx_buf = pkt;
> +
> + if (rx_buf == NULL) {
> + dev_err(dev->dev, "dropping RX:0x%x due to RX full\n",
> + pkt[0]);
> + goto rx_ret_irq;
> + }
> +
> + rx_buf[0] = pkt[0];
> + for (i = 1; i < ((len + 3) >> 2); i++) {
> + rx_buf[i] = readl_relaxed(dev->base + MGR_RX_MSG +
> + (4 * i));
> + dev_dbg(dev->dev, "reading data: %x\n", rx_buf[i]);
> + }
> +
> + switch (mc) {
> + u8 *buf, la;
> + u16 ele;
> +
> + case SLIM_MSG_MC_REPORT_PRESENT:
> + q_rx = true;
> + break;
> + case SLIM_MSG_MC_REPLY_INFORMATION:
> + case SLIM_MSG_MC_REPLY_VALUE:
> + slim_msg_response(&dev->ctrl, (u8 *)(rx_buf + 1),
> + (u8)(*rx_buf >> 24), (len - 4));
> + break;
> + case SLIM_MSG_MC_REPORT_INFORMATION:
> + buf = (u8 *)rx_buf;
> + la = buf[2];
> + ele = (u16)buf[4] << 4;
> +
> + ele |= ((buf[3] & 0xf0) >> 4);
> + /**
ditto
> + * report information is most likely loss of
> + * sync or collision detected in data slots
> + */
> + dev_err(dev->dev, "LA:%d report inf ele:0x%x\n",
> + la, ele);
> + for (i = 0; i < len - 5; i++)
> + dev_err(dev->dev, "bit-mask:%x\n",
> + buf[i+5]);
> + break;
> + default:
> + dev_err(dev->dev, "unsupported MC,%x MT:%x\n",
> + mc, mt);
> + break;
> + }
> +rx_ret_irq:
> + writel_relaxed(MGR_INT_RX_MSG_RCVD, dev->base +
> + MGR_INT_CLR);
> + /**
ditto
> + * Guarantee that CLR bit write goes through
> + * before exiting
> + */
> + mb();
> + if (q_rx)
> + queue_work(dev->rxwq, &dev->wd);
> +
> + ret = IRQ_HANDLED;
> + }
> + return ret;
> +}
[...]
> +static int msm_set_laddr(struct slim_controller *ctrl,
> + struct slim_eaddr *ead, u8 laddr)
> +{
> + struct msm_slim_ctrl *dev = slim_get_ctrldata(ctrl);
> + u8 buf[7];
> + int ret;
> + struct slim_val_inf msg = {0};
> +
> + DEFINE_SLIM_EDEST_TXN(txn, SLIM_MSG_MC_ASSIGN_LOGICAL_ADDRESS,
> + 10, laddr, &msg);
> +
> + /* Enumeration address */
> + buf[0] = (u8)(ead->manf_id >> 8);
> + buf[1] = (u8)(ead->manf_id & 0xFF);
> + buf[2] = (u8) (ead->prod_code >> 8);
> + buf[3] = (u8) (ead->prod_code & 0xFF);
> + buf[4] = ead->dev_index;
> + buf[5] = ead->instance;
> +
> + /* Logical address for this EA */
> + buf[6] = laddr;
> +
> + /**
ditto
> + * Retries are needed since bus may lose sync when multiple devices
> + * are coming up and reporting present
> + */
> + msg.wbuf = buf;
> + msg.num_bytes = 7;
> +
> + ret = slim_processtxn(&dev->ctrl, &txn);
> +
> + if (ret)
> + dev_err(dev->dev, "set LA:0x%x failed:ret:%d\n",
> + laddr, ret);
> + return ret;
> +}
[...]
> +static void msm_slim_prg_slew(struct platform_device *pdev,
> + struct msm_slim_ctrl *dev)
> +{
> + void __iomem *slew_reg;
> +
> + /* SLEW RATE register for this slimbus */
> + dev->slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "slew");
> + if (!dev->slew_mem) {
> + dev_warn(&pdev->dev, "no slimbus slew resource\n");
> + return;
> + }
> +
> + slew_reg = devm_ioremap(&pdev->dev, dev->slew_mem->start,
> + resource_size(dev->slew_mem));
How often will the driver program a slew rate?
If it's often, you'll have a "soft" memory leak over the life time of a
SLIM controller instance, because the mappings for slew_reg will
accumulate in the driver instance's devm area until they are all freed
in the end (If I'm reading the code correctly). I think you'll either
have to unmap slew_reg when this function returns (and not use devm), or
cache slew_reg so that subsequent calls to msm_slim_prg_slew won't
create more mappings.
> + if (!slew_reg) {
> + dev_err(dev->dev, "slew register mapping failed");
> + release_mem_region(dev->slew_mem->start,
> + resource_size(dev->slew_mem));
> + dev->slew_mem = NULL;
> + return;
> + }
> + writel_relaxed(1, slew_reg);
> + /* Make sure slimbus-slew rate enabling goes through */
> + wmb();
> +}
> +
> +static int msm_slim_probe(struct platform_device *pdev)
> +{
> + struct msm_slim_ctrl *dev;
> + struct slim_controller *ctrl;
> + struct resource *slim_mem;
> + struct resource *irq;
> + struct clk *hclk, *rclk;
> + int ret;
> +
> + hclk = devm_clk_get(&pdev->dev, "iface_clk");
> + if (IS_ERR(hclk))
> + return PTR_ERR(hclk);
> +
> + rclk = devm_clk_get(&pdev->dev, "core_clk");
> + if (IS_ERR(rclk)) {
> + /* unlikely that this is probe-defer */
> + dev_err(&pdev->dev, "rclk get failed:%ld\n", PTR_ERR(rclk));
> + return PTR_ERR(rclk);
> + }
> +
> + ret = clk_set_rate(rclk, SLIM_ROOT_FREQ);
> + if (ret) {
> + dev_err(&pdev->dev, "ref-clock set-rate failed:%d\n", ret);
> + return ret;
> + }
> +
> + slim_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
> + if (!slim_mem) {
> + dev_err(&pdev->dev, "no slimbus physical memory resource\n");
> + return -ENODEV;
> + }
> +
> + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (!irq) {
> + dev_err(&pdev->dev, "no slimbus IRQ resource\n");
> + return -ENODEV;
> + }
> +
> + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> + if (!dev)
> + return -ENOMEM;
> +
> + dev->hclk = hclk;
> + dev->rclk = rclk;
> + ctrl = &dev->ctrl;
> + dev->dev = &pdev->dev;
> + platform_set_drvdata(pdev, dev);
> + slim_set_ctrldata(&dev->ctrl, dev);
> + dev->base = devm_ioremap(dev->dev, slim_mem->start,
> + resource_size(slim_mem));
> + if (!dev->base) {
> + dev_err(&pdev->dev, "IOremap failed\n");
> + return -ENOMEM;
> + }
> +
> + dev->ctrl.set_laddr = msm_set_laddr;
> + dev->ctrl.xfer_msg = msm_xfer_msg;
> + dev->ctrl.tx.n = MSM_TX_MSGS;
> + dev->ctrl.rx.n = MSM_RX_MSGS;
> + dev->ctrl.tx.sl_sz = SLIM_MSGQ_BUF_LEN;
> + dev->ctrl.rx.sl_sz = SLIM_MSGQ_BUF_LEN;
> +
> + dev->irq = irq->start;
> +
> + INIT_WORK(&dev->wd, msm_slim_rxwq);
> + dev->rxwq = create_singlethread_workqueue("msm_slim_rx");
> + if (!dev->rxwq) {
> + dev_err(dev->dev, "Failed to start Rx WQ\n");
> + return -ENOMEM;
> + }
> +
> + dev->framer.rootfreq = SLIM_ROOT_FREQ >> 3;
> + dev->framer.superfreq =
> + dev->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
> + dev->ctrl.a_framer = &dev->framer;
> + dev->ctrl.clkgear = SLIM_MAX_CLK_GEAR;
> + dev->ctrl.dev.parent = &pdev->dev;
> + dev->ctrl.dev.of_node = pdev->dev.of_node;
> +
> + msm_slim_prg_slew(pdev, dev);
> +
> + ret = devm_request_irq(&pdev->dev, dev->irq, msm_slim_interrupt,
> + IRQF_TRIGGER_HIGH, "msm_slim_irq", dev);
> + if (ret) {
> + dev_err(&pdev->dev, "request IRQ failed\n");
> + goto err_request_irq_failed;
> + }
> +
> + ret = clk_prepare_enable(hclk);
> + if (ret)
> + goto err_hclk_enable_failed;
> +
> + ret = clk_prepare_enable(rclk);
> + if (ret)
> + goto err_rclk_enable_failed;
> +
> +
> + ctrl->tx.base = dma_alloc_coherent(&pdev->dev,
> + (ctrl->tx.sl_sz * ctrl->tx.n),
> + &ctrl->tx.phy, GFP_KERNEL);
Use dmam_alloc_coherent?
> + if (!ctrl->tx.base) {
> + ret = -ENOMEM;
> + goto tx_alloc_failed;
> + }
> +
> + ctrl->rx.base = dma_alloc_coherent(&pdev->dev,
> + (ctrl->rx.sl_sz * ctrl->rx.n),
> + &ctrl->rx.phy, GFP_KERNEL);
ditto
> + if (!ctrl->rx.base) {
> + ret = -ENOMEM;
> + goto rx_alloc_failed;
> + }
> +
> +
> + /* Register with framework before enabling frame, clock */
> + ret = slim_register_controller(&dev->ctrl);
> + if (ret) {
> + dev_err(dev->dev, "error adding controller\n");
> + goto err_ctrl_failed;
> + }
> +
> + dev->ver = readl_relaxed(dev->base);
> + /* Version info in 16 MSbits */
> + dev->ver >>= 16;
> + /* Component register initialization */
> + writel_relaxed(1, dev->base + CFG_PORT(COMP_CFG, dev->ver));
> + writel_relaxed((EE_MGR_RSC_GRP | EE_NGD_2 | EE_NGD_1),
> + dev->base + CFG_PORT(COMP_TRUST_CFG, dev->ver));
> +
> + writel_relaxed((MGR_INT_TX_NACKED_2 |
> + MGR_INT_MSG_BUF_CONTE | MGR_INT_RX_MSG_RCVD |
> + MGR_INT_TX_MSG_SENT), dev->base + MGR_INT_EN);
> + writel_relaxed(1, dev->base + MGR_CFG);
> + /*
> + * Framer registers are beyond 1K memory region after Manager and/or
> + * component registers. Make sure those writes are ordered
> + * before framer register writes
> + */
> + wmb();
> +
> + /* Framer register initialization */
> + writel_relaxed((1 << INTR_WAKE) | (0xA << REF_CLK_GEAR) |
> + (0xA << CLK_GEAR) | (1 << ROOT_FREQ) | (1 << FRM_ACTIVE) | 1,
> + dev->base + FRM_CFG);
> + /*
> + * Make sure that framer wake-up and enabling writes go through
> + * before any other component is enabled. Framer is responsible for
> + * clocking the bus and enabling framer first will ensure that other
> + * devices can report presence when they are enabled
> + */
> + mb();
> +
> + writel_relaxed(MGR_CFG_ENABLE, dev->base + MGR_CFG);
> + /*
> + * Make sure that manager-enable is written through before interface
> + * device is enabled
> + */
> + mb();
> + writel_relaxed(1, dev->base + INTF_CFG);
> + /*
> + * Make sure that interface-enable is written through before enabling
> + * ported generic device inside MSM manager
> + */
> + mb();
> +
> + writel_relaxed(1, dev->base + CFG_PORT(COMP_CFG, dev->ver));
> + /*
> + * Make sure that all writes have gone through before exiting this
> + * function
> + */
> + mb();
> +
> + dev_dbg(dev->dev, "MSM SB controller is up:ver:0x%x!\n", dev->ver);
> + return 0;
> +
> +err_ctrl_failed:
> + dma_free_coherent(&pdev->dev, (ctrl->rx.sl_sz * ctrl->rx.n),
> + ctrl->rx.base, ctrl->rx.phy);
> +rx_alloc_failed:
> + dma_free_coherent(ctrl->dev.parent, (ctrl->tx.sl_sz * ctrl->tx.n),
> + ctrl->tx.base, ctrl->tx.phy);
> +tx_alloc_failed:
> + clk_disable_unprepare(dev->rclk);
> +err_rclk_enable_failed:
> + clk_disable_unprepare(dev->hclk);
> +
> +err_hclk_enable_failed:
> +err_request_irq_failed:
> + destroy_workqueue(dev->rxwq);
> + return ret;
> +}
Thanks,
Jonathan Neuschäfer
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