Re: [PATCH V3] pci: exynos: split into two parts such as Synopsyspart and Exynos part
From: Kishon Vijay Abraham I
Date: Mon Jul 22 2013 - 11:04:17 EST
Hi,
On Thursday 18 July 2013 10:51 AM, Jingoo Han wrote:
> Exynos PCIe IP consists of Synopsys specific part and Exynos
> specific part. Only core block is a Synopsys designware part;
> other parts are Exynos specific.
> Also, the Synopsys designware part can be shared with other
> platforms; thus, it can be split two parts such as Synopsys
> designware part and Exynos specific part.
some more queries and comments..
>
> Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
> Cc: Pratyush Anand <pratyush.anand@xxxxxx>
> Cc: Mohit KUMAR <Mohit.KUMAR@xxxxxx>
> ---
> Changes since v2:
.
.
<snip>
.
.
> +
> +static struct pcie_host_ops exynos_pcie_host_ops = {
> + .readl_rc = exynos_pcie_readl_rc,
> + .writel_rc = exynos_pcie_writel_rc,
> + .rd_own_conf = exynos_pcie_rd_own_conf,
> + .wr_own_conf = exynos_pcie_wr_own_conf,
> + .link_up = exynos_pcie_link_up,
> + .host_init = exynos_pcie_host_init,
> +};
> +
> +static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
> +{
> + struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
We can move the exynos_pcie specific initialization to probe and leave only
pcie_port initialization here.
> + struct resource *elbi_base;
> + struct resource *phy_base;
> + struct resource *block_base;
> + int ret;
> +
> + elbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!elbi_base) {
> + dev_err(&pdev->dev, "couldn't get elbi base resource\n");
> + return -EINVAL;
> + }
> + exynos_pcie->elbi_base = devm_ioremap_resource(&pdev->dev, elbi_base);
> + if (IS_ERR(exynos_pcie->elbi_base))
> + return PTR_ERR(exynos_pcie->elbi_base);
> +
> + phy_base = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + if (!phy_base) {
> + dev_err(&pdev->dev, "couldn't get phy base resource\n");
> + return -EINVAL;
> + }
> + exynos_pcie->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
> + if (IS_ERR(exynos_pcie->phy_base))
> + return PTR_ERR(exynos_pcie->phy_base);
> +
> + block_base = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> + if (!block_base) {
> + dev_err(&pdev->dev, "couldn't get block base resource\n");
> + return -EINVAL;
> + }
> + exynos_pcie->block_base = devm_ioremap_resource(&pdev->dev, block_base);
> + if (IS_ERR(exynos_pcie->block_base))
> + return PTR_ERR(exynos_pcie->block_base);
So all this till here can be moved to probe.
> +
> + pp->irq = platform_get_irq(pdev, 1);
> + if (!pp->irq) {
> + dev_err(&pdev->dev, "failed to get irq\n");
> + return -ENODEV;
> + }
> + ret = devm_request_irq(&pdev->dev, pp->irq, exynos_pcie_irq_handler,
> + IRQF_SHARED, "exynos-pcie", pp);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to request irq\n");
> + return ret;
> + }
> +
> + pp->root_bus_nr = -1;
> + pp->ops = &exynos_pcie_host_ops;
> +
> + spin_lock_init(&pp->conf_lock);
> + ret = dw_pcie_host_init(pp);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to initialize host\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int __init exynos_pcie_probe(struct platform_device *pdev)
> +{
> + struct exynos_pcie *exynos_pcie;
> + struct pcie_port *pp;
> + struct device_node *np = pdev->dev.of_node;
> + int ret;
> +
> + exynos_pcie = devm_kzalloc(&pdev->dev, sizeof(*exynos_pcie),
> + GFP_KERNEL);
> + if (!exynos_pcie) {
> + dev_err(&pdev->dev, "no memory for exynos pcie\n");
> + return -ENOMEM;
> + }
> +
> + pp = &exynos_pcie->pp;
> +
> + pp->dev = &pdev->dev;
> +
> + exynos_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
> +
> + exynos_pcie->clk = devm_clk_get(&pdev->dev, "pcie");
> + if (IS_ERR(exynos_pcie->clk)) {
> + dev_err(&pdev->dev, "Failed to get pcie rc clock\n");
> + return PTR_ERR(exynos_pcie->clk);
> + }
> + ret = clk_prepare_enable(exynos_pcie->clk);
> + if (ret)
> + return ret;
> +
> + exynos_pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
> + if (IS_ERR(exynos_pcie->bus_clk)) {
> + dev_err(&pdev->dev, "Failed to get pcie bus clock\n");
> + ret = PTR_ERR(exynos_pcie->bus_clk);
> + goto fail_clk;
> + }
> + ret = clk_prepare_enable(exynos_pcie->bus_clk);
> + if (ret)
> + goto fail_clk;
> +
> + ret = add_pcie_port(pp, pdev);
> + if (ret < 0)
> + goto fail_bus_clk;
I think we should move all the below code to designware core file. IMO it
should be common everyone who use designware core.
> +
> + dw_pci.nr_controllers = 1;
> + dw_pci.private_data = (void **)&pp;
> +
> + pci_common_init(&dw_pci);
> + pci_assign_unassigned_resources();
> +#ifdef CONFIG_PCI_DOMAINS
> + dw_pci.domain++;
> +#endif
> +
> + platform_set_drvdata(pdev, exynos_pcie);
> + return 0;
> +
> +fail_bus_clk:
> + clk_disable_unprepare(exynos_pcie->bus_clk);
> +fail_clk:
> + clk_disable_unprepare(exynos_pcie->clk);
> + return ret;
> +}
> +
> +static int __exit exynos_pcie_remove(struct platform_device *pdev)
> +{
> + struct exynos_pcie *exynos_pcie = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(exynos_pcie->bus_clk);
> + clk_disable_unprepare(exynos_pcie->clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id exynos_pcie_of_match[] = {
> + { .compatible = "samsung,exynos5440-pcie", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, exynos_pcie_of_match);
> +
> +static struct platform_driver exynos_pcie_driver = {
> + .remove = __exit_p(exynos_pcie_remove),
> + .driver = {
> + .name = "exynos-pcie",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(exynos_pcie_of_match),
> + },
> +};
> +
> +/* Exynos PCIe driver does not allow module unload */
> +
> +static int __init pcie_init(void)
> +{
> + return platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
> +}
> +subsys_initcall(pcie_init);
> +
> +MODULE_AUTHOR("Jingoo Han <jg1.han@xxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Samsung PCIe host controller driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 26bdbda..f097eff 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -1,5 +1,5 @@
> /*
> - * PCIe host controller driver for Samsung EXYNOS SoCs
> + * Synopsys Designware PCIe host controller driver
> *
> * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> * http://www.samsung.com
> @@ -11,74 +11,28 @@
> * published by the Free Software Foundation.
> */
>
> -#include <linux/clk.h>
> -#include <linux/delay.h>
> -#include <linux/gpio.h>
> -#include <linux/interrupt.h>
> #include <linux/kernel.h>
> -#include <linux/list.h>
> #include <linux/module.h>
> -#include <linux/of.h>
> #include <linux/of_address.h>
> -#include <linux/of_gpio.h>
> -#include <linux/of_pci.h>
> #include <linux/pci.h>
> #include <linux/pci_regs.h>
> -#include <linux/platform_device.h>
> -#include <linux/resource.h>
> -#include <linux/signal.h>
> -#include <linux/slab.h>
> #include <linux/types.h>
>
> -struct pcie_port_info {
> - u32 cfg0_size;
> - u32 cfg1_size;
> - u32 io_size;
> - u32 mem_size;
> - phys_addr_t io_bus_addr;
> - phys_addr_t mem_bus_addr;
> -};
> -
> -struct pcie_port {
> - struct device *dev;
> - u8 controller;
> - u8 root_bus_nr;
> - void __iomem *dbi_base;
> - void __iomem *elbi_base;
> - void __iomem *phy_base;
> - void __iomem *purple_base;
> - u64 cfg0_base;
> - void __iomem *va_cfg0_base;
> - u64 cfg1_base;
> - void __iomem *va_cfg1_base;
> - u64 io_base;
> - u64 mem_base;
> - spinlock_t conf_lock;
> - struct resource cfg;
> - struct resource io;
> - struct resource mem;
> - struct pcie_port_info config;
> - struct clk *clk;
> - struct clk *bus_clk;
> - int irq;
> - int reset_gpio;
> -};
> -
> -/*
> - * Exynos PCIe IP consists of Synopsys specific part and Exynos
> - * specific part. Only core block is a Synopsys designware part;
> - * other parts are Exynos specific.
> - */
> +#include "pcie-designware.h"
>
> /* Synopsis specific PCIE configuration registers */
> #define PCIE_PORT_LINK_CONTROL 0x710
> #define PORT_LINK_MODE_MASK (0x3f << 16)
> +#define PORT_LINK_MODE_1_LANES (0x1 << 16)
> +#define PORT_LINK_MODE_2_LANES (0x3 << 16)
> #define PORT_LINK_MODE_4_LANES (0x7 << 16)
>
> #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
> #define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
> #define PORT_LOGIC_LINK_WIDTH_MASK (0x1ff << 8)
> -#define PORT_LOGIC_LINK_WIDTH_4_LANES (0x7 << 8)
> +#define PORT_LOGIC_LINK_WIDTH_1_LANES (0x1 << 8)
> +#define PORT_LOGIC_LINK_WIDTH_2_LANES (0x2 << 8)
> +#define PORT_LOGIC_LINK_WIDTH_4_LANES (0x4 << 8)
>
> #define PCIE_MSI_ADDR_LO 0x820
> #define PCIE_MSI_ADDR_HI 0x824
> @@ -108,69 +62,14 @@ struct pcie_port {
> #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
> #define PCIE_ATU_UPPER_TARGET 0x91C
>
> -/* Exynos specific PCIE configuration registers */
> -
> -/* PCIe ELBI registers */
> -#define PCIE_IRQ_PULSE 0x000
> -#define IRQ_INTA_ASSERT (0x1 << 0)
> -#define IRQ_INTB_ASSERT (0x1 << 2)
> -#define IRQ_INTC_ASSERT (0x1 << 4)
> -#define IRQ_INTD_ASSERT (0x1 << 6)
> -#define PCIE_IRQ_LEVEL 0x004
> -#define PCIE_IRQ_SPECIAL 0x008
> -#define PCIE_IRQ_EN_PULSE 0x00c
> -#define PCIE_IRQ_EN_LEVEL 0x010
> -#define PCIE_IRQ_EN_SPECIAL 0x014
> -#define PCIE_PWR_RESET 0x018
> -#define PCIE_CORE_RESET 0x01c
> -#define PCIE_CORE_RESET_ENABLE (0x1 << 0)
> -#define PCIE_STICKY_RESET 0x020
> -#define PCIE_NONSTICKY_RESET 0x024
> -#define PCIE_APP_INIT_RESET 0x028
> -#define PCIE_APP_LTSSM_ENABLE 0x02c
> -#define PCIE_ELBI_RDLH_LINKUP 0x064
> -#define PCIE_ELBI_LTSSM_ENABLE 0x1
> -#define PCIE_ELBI_SLV_AWMISC 0x11c
> -#define PCIE_ELBI_SLV_ARMISC 0x120
> -#define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21)
> -
> -/* PCIe Purple registers */
> -#define PCIE_PHY_GLOBAL_RESET 0x000
> -#define PCIE_PHY_COMMON_RESET 0x004
> -#define PCIE_PHY_CMN_REG 0x008
> -#define PCIE_PHY_MAC_RESET 0x00c
> -#define PCIE_PHY_PLL_LOCKED 0x010
> -#define PCIE_PHY_TRSVREG_RESET 0x020
> -#define PCIE_PHY_TRSV_RESET 0x024
> -
> -/* PCIe PHY registers */
> -#define PCIE_PHY_IMPEDANCE 0x004
> -#define PCIE_PHY_PLL_DIV_0 0x008
> -#define PCIE_PHY_PLL_BIAS 0x00c
> -#define PCIE_PHY_DCC_FEEDBACK 0x014
> -#define PCIE_PHY_PLL_DIV_1 0x05c
> -#define PCIE_PHY_TRSV0_EMP_LVL 0x084
> -#define PCIE_PHY_TRSV0_DRV_LVL 0x088
> -#define PCIE_PHY_TRSV0_RXCDR 0x0ac
> -#define PCIE_PHY_TRSV0_LVCC 0x0dc
> -#define PCIE_PHY_TRSV1_EMP_LVL 0x144
> -#define PCIE_PHY_TRSV1_RXCDR 0x16c
> -#define PCIE_PHY_TRSV1_LVCC 0x19c
> -#define PCIE_PHY_TRSV2_EMP_LVL 0x204
> -#define PCIE_PHY_TRSV2_RXCDR 0x22c
> -#define PCIE_PHY_TRSV2_LVCC 0x25c
> -#define PCIE_PHY_TRSV3_EMP_LVL 0x2c4
> -#define PCIE_PHY_TRSV3_RXCDR 0x2ec
> -#define PCIE_PHY_TRSV3_LVCC 0x31c
> -
> -static struct hw_pci exynos_pci;
> +unsigned long global_io_offset;
>
> static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
> {
> return sys->private_data;
> }
>
> -static inline int cfg_read(void *addr, int where, int size, u32 *val)
> +int cfg_read(void *addr, int where, int size, u32 *val)
> {
> *val = readl(addr);
>
> @@ -184,7 +83,7 @@ static inline int cfg_read(void *addr, int where, int size, u32 *val)
> return PCIBIOS_SUCCESSFUL;
> }
>
> -static inline int cfg_write(void *addr, int where, int size, u32 val)
> +int cfg_write(void *addr, int where, int size, u32 val)
> {
> if (size == 4)
> writel(val, addr);
> @@ -198,155 +97,230 @@ static inline int cfg_write(void *addr, int where, int size, u32 val)
> return PCIBIOS_SUCCESSFUL;
> }
>
> -static void exynos_pcie_sideband_dbi_w_mode(struct pcie_port *pp, bool on)
> -{
> - u32 val;
> -
> - if (on) {
> - val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> - val |= PCIE_ELBI_SLV_DBI_ENABLE;
> - writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> - } else {
> - val = readl(pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> - val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> - writel(val, pp->elbi_base + PCIE_ELBI_SLV_AWMISC);
> - }
> -}
> -
> -static void exynos_pcie_sideband_dbi_r_mode(struct pcie_port *pp, bool on)
> +static inline void dw_pcie_readl_rc(struct pcie_port *pp,
> + void __iomem *dbi_addr, u32 *val)
> {
> - u32 val;
> -
> - if (on) {
> - val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> - val |= PCIE_ELBI_SLV_DBI_ENABLE;
> - writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> - } else {
> - val = readl(pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> - val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
> - writel(val, pp->elbi_base + PCIE_ELBI_SLV_ARMISC);
> - }
> -}
> -
> -static inline void readl_rc(struct pcie_port *pp, void *dbi_base, u32 *val)
> -{
> - exynos_pcie_sideband_dbi_r_mode(pp, true);
> - *val = readl(dbi_base);
> - exynos_pcie_sideband_dbi_r_mode(pp, false);
> - return;
> + if (pp->ops->readl_rc)
> + pp->ops->readl_rc(pp, dbi_addr, val);
> + else
> + *val = readl(dbi_addr);
> }
>
> -static inline void writel_rc(struct pcie_port *pp, u32 val, void *dbi_base)
> +static inline void dw_pcie_writel_rc(struct pcie_port *pp,
> + u32 val, void __iomem *dbi_addr)
> {
> - exynos_pcie_sideband_dbi_w_mode(pp, true);
> - writel(val, dbi_base);
> - exynos_pcie_sideband_dbi_w_mode(pp, false);
> - return;
> + if (pp->ops->writel_rc)
> + pp->ops->writel_rc(pp, val, dbi_addr);
> + else
> + writel(val, dbi_addr);
> }
>
> -static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> u32 *val)
> {
> int ret;
>
> - exynos_pcie_sideband_dbi_r_mode(pp, true);
> - ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> - exynos_pcie_sideband_dbi_r_mode(pp, false);
> + if (pp->ops->rd_own_conf)
> + ret = pp->ops->rd_own_conf(pp, where, size, val);
> + else
> + ret = cfg_read(pp->dbi_base + (where & ~0x3), where, size, val);
> +
> return ret;
> }
>
> -static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
> +int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
> u32 val)
> {
> int ret;
>
> - exynos_pcie_sideband_dbi_w_mode(pp, true);
> - ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size, val);
> - exynos_pcie_sideband_dbi_w_mode(pp, false);
> + if (pp->ops->wr_own_conf)
> + ret = pp->ops->wr_own_conf(pp, where, size, val);
> + else
> + ret = cfg_write(pp->dbi_base + (where & ~0x3), where, size,
> + val);
> +
> return ret;
> }
>
> -static void exynos_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
> +int dw_pcie_link_up(struct pcie_port *pp)
> +{
> + if (pp->ops->link_up)
> + return pp->ops->link_up(pp);
> + else
> + return 0;
> +}
> +
> +int dw_pcie_host_init(struct pcie_port *pp)
> +{
> + struct device_node *np = pp->dev->of_node;
> + struct of_pci_range range;
> + struct of_pci_range_parser parser;
> + u32 val;
> +
> + if (of_pci_range_parser_init(&parser, np)) {
> + dev_err(pp->dev, "missing ranges property\n");
> + return -EINVAL;
> + }
I have some confusion here w.r.t address space :-s
> +
> + /* Get the I/O and memory ranges from DT */
> + for_each_of_pci_range(&parser, &range) {
> + unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
> + if (restype == IORESOURCE_IO) {
> + of_pci_range_to_resource(&range, np, &pp->io);
> + pp->io.name = "I/O";
> + pp->io.start = max_t(resource_size_t,
> + PCIBIOS_MIN_IO,
> + range.pci_addr + global_io_offset);
> + pp->io.end = min_t(resource_size_t,
> + IO_SPACE_LIMIT,
> + range.pci_addr + range.size
> + + global_io_offset);
> + pp->config.io_size = resource_size(&pp->io);
> + pp->config.io_bus_addr = range.pci_addr;
> + }
> + if (restype == IORESOURCE_MEM) {
> + of_pci_range_to_resource(&range, np, &pp->mem);
> + pp->mem.name = "MEM";
> + pp->config.mem_size = resource_size(&pp->mem);
> + pp->config.mem_bus_addr = range.pci_addr;
> + }
> + if (restype == 0) {
> + of_pci_range_to_resource(&range, np, &pp->cfg);
> + pp->config.cfg0_size = resource_size(&pp->cfg)/2;
> + pp->config.cfg1_size = resource_size(&pp->cfg)/2;
> + }
> + }
> +
> + pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
> + resource_size(&pp->cfg));
Why is configuraion space divided into two? Why should it be same as dbi_base?
AFAIK, jacinto6 has a dedicated configuration/io/memory space that is entirely
different from dbi_base.
Thanks
Kishon
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