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Date: Thu, 27 Jul 2017 11:19:55 +0800
From: Honghui Zhang <honghui.zhang@...iatek.com>
To: <bhelgaas@...gle.com>
CC: <robh@...enl.org>, <robh+dt@...nel.org>, <matthias.bgg@...il.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
<ryder.lee@...iatek.com>, <hongkun.cao@...iatek.com>,
<youlin.pei@...iatek.com>, <yong.wu@...iatek.com>,
<yt.shen@...iatek.com>, <sean.wang@...iatek.com>,
<xinping.qian@...iatek.com>
Subject: Re: [PATCH v2 1/5] PCI: mediatek: Add a structure to abstract the
controller generations
On Thu, 2017-07-27 at 10:58 +0800, honghui.zhang@...iatek.com wrote:
> From: Ryder Lee <ryder.lee@...iatek.com>
>
> Introduce a structure "mtk_pcie_soc" to abstract the differences between
> controller generations, and the .startup() hook is used to encapsulate
> some SoC-dependent related setting. In doing so, the common code which
> will be reused by future chips.
>
> In addition, we change the approaches to waiting Gen2 training by using
> readl_poll_timeout() calls.
>
> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> Signed-off-by: Honghui Zhang <honghui.zhang@...iatek.com>
> ---
> drivers/pci/host/pcie-mediatek.c | 81 +++++++++++++++++++++++-----------------
> 1 file changed, 47 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
> index 5a9d858..7f952a4 100644
> --- a/drivers/pci/host/pcie-mediatek.c
> +++ b/drivers/pci/host/pcie-mediatek.c
> @@ -16,6 +16,7 @@
>
Sorry about the disturb, I send the wrong patch for this one.
I will resend the right version for this last patch.
thanks.
> #include <linux/clk.h>
> #include <linux/delay.h>
> +#include <linux/iopoll.h>
> #include <linux/kernel.h>
> #include <linux/of_address.h>
> #include <linux/of_pci.h>
> @@ -63,6 +64,18 @@
> #define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
> #define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
>
> +struct mtk_pcie_port;
> +
> +/**
> + * struct mtk_pcie_soc - differentiate between host generations
> + * @ops: pointer to configuration access functions
> + * @startup: pointer to controller setting functions
> + */
> +struct mtk_pcie_soc {
> + struct pci_ops *ops;
> + int (*startup)(struct mtk_pcie_port *port);
> +};
> +
> /**
> * struct mtk_pcie_port - PCIe port information
> * @base: IO mapped register base
> @@ -96,6 +109,7 @@ struct mtk_pcie_port {
> * @busn: bus range
> * @offset: IO / Memory offset
> * @ports: pointer to PCIe port information
> + * @soc: pointer to SoC-dependent operations
> */
> struct mtk_pcie {
> struct device *dev;
> @@ -111,13 +125,9 @@ struct mtk_pcie {
> resource_size_t io;
> } offset;
> struct list_head ports;
> + const struct mtk_pcie_soc *soc;
> };
>
> -static inline bool mtk_pcie_link_up(struct mtk_pcie_port *port)
> -{
> - return !!(readl(port->base + PCIE_LINK_STATUS) & PCIE_PORT_LINKUP);
> -}
> -
> static void mtk_pcie_subsys_powerdown(struct mtk_pcie *pcie)
> {
> struct device *dev = pcie->dev;
> @@ -171,12 +181,30 @@ static struct pci_ops mtk_pcie_ops = {
> .write = pci_generic_config_write,
> };
>
> -static void mtk_pcie_configure_rc(struct mtk_pcie_port *port)
> +static int mtk_pcie_startup_ports(struct mtk_pcie_port *port)
> {
> struct mtk_pcie *pcie = port->pcie;
> u32 func = PCI_FUNC(port->index << 3);
> u32 slot = PCI_SLOT(port->index << 3);
> u32 val;
> + int err;
> +
> + /* assert port PERST_N */
> + val = readl(pcie->base + PCIE_SYS_CFG);
> + val |= PCIE_PORT_PERST(port->index);
> + writel(val, pcie->base + PCIE_SYS_CFG);
> +
> + /* de-assert port PERST_N */
> + val = readl(pcie->base + PCIE_SYS_CFG);
> + val &= ~PCIE_PORT_PERST(port->index);
> + writel(val, pcie->base + PCIE_SYS_CFG);
> +
> + /* 100ms timeout value should be enough for Gen1/2 training */
> + err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
> + !!(val & PCIE_PORT_LINKUP), 20,
> + 100 * USEC_PER_MSEC);
> + if (err)
> + return -ETIMEDOUT;
>
> /* enable interrupt */
> val = readl(pcie->base + PCIE_INT_ENABLE);
> @@ -209,30 +237,14 @@ static void mtk_pcie_configure_rc(struct mtk_pcie_port *port)
> writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
> pcie->base + PCIE_CFG_ADDR);
> writel(val, pcie->base + PCIE_CFG_DATA);
> -}
>
> -static void mtk_pcie_assert_ports(struct mtk_pcie_port *port)
> -{
> - struct mtk_pcie *pcie = port->pcie;
> - u32 val;
> -
> - /* assert port PERST_N */
> - val = readl(pcie->base + PCIE_SYS_CFG);
> - val |= PCIE_PORT_PERST(port->index);
> - writel(val, pcie->base + PCIE_SYS_CFG);
> -
> - /* de-assert port PERST_N */
> - val = readl(pcie->base + PCIE_SYS_CFG);
> - val &= ~PCIE_PORT_PERST(port->index);
> - writel(val, pcie->base + PCIE_SYS_CFG);
> -
> - /* PCIe v2.0 need at least 100ms delay to train from Gen1 to Gen2 */
> - msleep(100);
> + return 0;
> }
>
> static void mtk_pcie_enable_ports(struct mtk_pcie_port *port)
> {
> - struct device *dev = port->pcie->dev;
> + struct mtk_pcie *pcie = port->pcie;
> + struct device *dev = pcie->dev;
> int err;
>
> err = clk_prepare_enable(port->sys_ck);
> @@ -250,13 +262,8 @@ static void mtk_pcie_enable_ports(struct mtk_pcie_port *port)
> goto err_phy_on;
> }
>
> - mtk_pcie_assert_ports(port);
> -
> - /* if link up, then setup root port configuration space */
> - if (mtk_pcie_link_up(port)) {
> - mtk_pcie_configure_rc(port);
> + if (!pcie->soc->startup(port))
> return;
> - }
>
> dev_info(dev, "Port%d link down\n", port->index);
>
> @@ -480,7 +487,7 @@ static int mtk_pcie_register_host(struct pci_host_bridge *host)
>
> host->busnr = pcie->busn.start;
> host->dev.parent = pcie->dev;
> - host->ops = &mtk_pcie_ops;
> + host->ops = pcie->soc->ops;
> host->map_irq = of_irq_parse_and_map_pci;
> host->swizzle_irq = pci_common_swizzle;
>
> @@ -513,6 +520,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> pcie = pci_host_bridge_priv(host);
>
> pcie->dev = dev;
> + pcie->soc = of_device_get_match_data(dev);
> platform_set_drvdata(pdev, pcie);
> INIT_LIST_HEAD(&pcie->ports);
>
> @@ -537,9 +545,14 @@ static int mtk_pcie_probe(struct platform_device *pdev)
> return err;
> }
>
> +static struct mtk_pcie_soc mtk_pcie_soc_v1 = {
> + .ops = &mtk_pcie_ops,
> + .startup = mtk_pcie_startup_ports,
> +};
> +
> static const struct of_device_id mtk_pcie_ids[] = {
> - { .compatible = "mediatek,mt7623-pcie"},
> - { .compatible = "mediatek,mt2701-pcie"},
> + { .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
> + { .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
> {},
> };
>
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