From: Lucas Stach <l.stach@pengutronix.de>
To: Minghuan Lian <Minghuan.Lian@freescale.com>
Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Zang Roy-R61911 <r61911@freescale.com>,
Hu Mingkai-B21284 <B21284@freescale.com>,
Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: [PATCH] PCI: designware: Add support 4 ATUs assignment
Date: Mon, 10 Nov 2014 13:00:20 +0100 [thread overview]
Message-ID: <1415620820.20340.1.camel@pengutronix.de> (raw)
In-Reply-To: <1415616205-21255-1-git-send-email-Minghuan.Lian@freescale.com>
Am Montag, den 10.11.2014, 18:43 +0800 schrieb Minghuan Lian:
> Currently, pcie-designware.c only supports two ATUs, ATU0 is used
> for CFG0 and MEM, ATU1 is used for CFG1 and IO. There is a conflict
> when MEM and CFG0 are accessed simultaneously. The patch adds
> 'num-atus' property to PCIe dts node to describe the number of
> PCIe controller's ATUs. If num_atus is bigger than or equal to 4,
> we will change ATUs assignment: ATU0 for CFG0, ATU1 for CFG1,
> ATU2 for MEM, ATU3 for IO.
>
> Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
> ---
> .../devicetree/bindings/pci/designware-pcie.txt | 1 +
> drivers/pci/host/pcie-designware.c | 48 ++++++++++++++++------
> drivers/pci/host/pcie-designware.h | 5 +++
> 3 files changed, 41 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> index 9f4faa8..500796e 100644
> --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
> @@ -26,3 +26,4 @@ Optional properties:
> - bus-range: PCI bus numbers covered (it is recommended for new devicetrees to
> specify this property, to keep backwards compatibility a range of 0x00-0xff
> is assumed if not present)
> +- num-atus: number of ATUs
This lacks documentation for the default value if not present.
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index dfed00a..b872dd0 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -48,6 +48,8 @@
> #define PCIE_ATU_VIEWPORT 0x900
> #define PCIE_ATU_REGION_INBOUND (0x1 << 31)
> #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
> +#define PCIE_ATU_REGION_INDEX3 (0x3 << 0)
> +#define PCIE_ATU_REGION_INDEX2 (0x2 << 0)
> #define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
> #define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
> #define PCIE_ATU_CR1 0x904
> @@ -346,7 +348,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> struct of_pci_range range;
> struct of_pci_range_parser parser;
> struct resource *cfg_res;
> - u32 val, na, ns;
> + u32 num_atus, val, na, ns;
> const __be32 *addrp;
> int i, index, ret;
>
> @@ -486,6 +488,18 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> }
> }
>
> + if (of_property_read_u32(np, "num-atus", &num_atus))
> + num_atus = 2;
You don't need this check. Just initialize num_atus to 2,
of_property_read_u32() won't touch the value if the property isn't
found.
> + if (num_atus >= 4) {
> + pp->atu_cfg0_idx = PCIE_ATU_REGION_INDEX0;
> + pp->atu_cfg1_idx = PCIE_ATU_REGION_INDEX1;
> + pp->atu_mem_idx = PCIE_ATU_REGION_INDEX2;
> + pp->atu_io_idx = PCIE_ATU_REGION_INDEX3;
> + } else {
> + pp->atu_cfg0_idx = pp->atu_mem_idx = PCIE_ATU_REGION_INDEX0;
> + pp->atu_cfg1_idx = pp->atu_io_idx = PCIE_ATU_REGION_INDEX1;
> + }
> +
> if (pp->ops->host_init)
> pp->ops->host_init(pp);
>
> @@ -511,8 +525,8 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
>
> static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
> {
> - /* Program viewport 0 : OUTBOUND : CFG0 */
> - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
> + /* Program viewport : OUTBOUND : CFG0 */
> + dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | pp->atu_cfg0_idx,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, pp->cfg0_mod_base, PCIE_ATU_LOWER_BASE);
> dw_pcie_writel_rc(pp, (pp->cfg0_mod_base >> 32), PCIE_ATU_UPPER_BASE);
> @@ -526,8 +540,8 @@ static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
>
> static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
> {
> - /* Program viewport 1 : OUTBOUND : CFG1 */
> - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
> + /* Program viewport : OUTBOUND : CFG1 */
> + dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | pp->atu_cfg1_idx,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, pp->cfg1_mod_base, PCIE_ATU_LOWER_BASE);
> @@ -541,8 +555,8 @@ static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
>
> static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
> {
> - /* Program viewport 0 : OUTBOUND : MEM */
> - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
> + /* Program viewport : OUTBOUND : MEM */
> + dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | pp->atu_mem_idx,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, pp->mem_mod_base, PCIE_ATU_LOWER_BASE);
> @@ -557,8 +571,8 @@ static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
>
> static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
> {
> - /* Program viewport 1 : OUTBOUND : IO */
> - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
> + /* Program viewport : OUTBOUND : IO */
> + dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | pp->atu_io_idx,
> PCIE_ATU_VIEWPORT);
> dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1);
> dw_pcie_writel_rc(pp, pp->io_mod_base, PCIE_ATU_LOWER_BASE);
> @@ -585,12 +599,14 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> dw_pcie_prog_viewport_cfg0(pp, busdev);
> ret = dw_pcie_cfg_read(pp->va_cfg0_base + address, where, size,
> val);
> - dw_pcie_prog_viewport_mem_outbound(pp);
> + if (pp->atu_mem_idx == pp->atu_cfg0_idx)
> + dw_pcie_prog_viewport_mem_outbound(pp);
> } else {
> dw_pcie_prog_viewport_cfg1(pp, busdev);
> ret = dw_pcie_cfg_read(pp->va_cfg1_base + address, where, size,
> val);
> - dw_pcie_prog_viewport_io_outbound(pp);
> + if (pp->atu_io_idx == pp->atu_cfg1_idx)
> + dw_pcie_prog_viewport_io_outbound(pp);
> }
>
> return ret;
> @@ -610,12 +626,14 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
> dw_pcie_prog_viewport_cfg0(pp, busdev);
> ret = dw_pcie_cfg_write(pp->va_cfg0_base + address, where, size,
> val);
> - dw_pcie_prog_viewport_mem_outbound(pp);
> + if (pp->atu_mem_idx == pp->atu_cfg0_idx)
> + dw_pcie_prog_viewport_mem_outbound(pp);
> } else {
> dw_pcie_prog_viewport_cfg1(pp, busdev);
> ret = dw_pcie_cfg_write(pp->va_cfg1_base + address, where, size,
> val);
> - dw_pcie_prog_viewport_io_outbound(pp);
> + if (pp->atu_io_idx == pp->atu_cfg1_idx)
> + dw_pcie_prog_viewport_io_outbound(pp);
> }
>
> return ret;
> @@ -770,6 +788,10 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> u32 membase;
> u32 memlimit;
>
> + /* set ATUs setting for MEM and IO */
> + dw_pcie_prog_viewport_mem_outbound(pp);
> + dw_pcie_prog_viewport_io_outbound(pp);
> +
> /* set the number of lanes */
> dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
> val &= ~PORT_LINK_MODE_MASK;
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index c625675..404f601 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -53,6 +53,11 @@ struct pcie_port {
> struct irq_domain *irq_domain;
> unsigned long msi_data;
> DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
> + /* ATUs setting */
> + u8 atu_cfg0_idx;
> + u8 atu_cfg1_idx;
> + u8 atu_mem_idx;
> + u8 atu_io_idx;
I don't like those single values. Can we please make this an array
indexed by a proper enum? Like this:
enum ATU_TYPE {
ATU_TYPE_CFG0 = 0,
ATU_TYPE_CFG1 = 1,
ATU_TYPE_MEM = 2,
ATU_TYPE_IO = 3,
ATU_TYPE_MAX
}
u8 atu_idx[ATU_TYPE_MAX];
--
Pengutronix e.K. | Lucas Stach |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2014-11-10 12:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-10 10:43 [PATCH] PCI: designware: Add support 4 ATUs assignment Minghuan Lian
2014-11-10 12:00 ` Lucas Stach [this message]
2014-11-11 1:48 ` Lian Minghuan-B31939
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