From 0df6150e7ceb8967c0f4e953a4468a5c7b184be8 Mon Sep 17 00:00:00 2001 From: Dien Pham Date: Sun, 8 Apr 2018 15:09:25 +0200 Subject: [PATCH 01/13] PCI: rcar: Use runtime PM to control controller clock The controller clock can be switched off during suspend/resume, let runtime PM take care of that. Signed-off-by: Dien Pham Signed-off-by: Hien Dang Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org To: linux-pci@vger.kernel.org Reviewed-by: Simon Horman Reviewed-by: Geert Uytterhoeven --- drivers/pci/host/pcie-rcar.c | 38 ++++++++++++------------------------ 1 file changed, 12 insertions(+), 26 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 6ab28f29ac6a..25f68305322c 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -142,7 +142,6 @@ struct rcar_pcie { void __iomem *base; struct list_head resources; int root_bus_nr; - struct clk *clk; struct clk *bus_clk; struct rcar_msi msi; }; @@ -914,24 +913,14 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie) if (IS_ERR(pcie->base)) return PTR_ERR(pcie->base); - pcie->clk = devm_clk_get(dev, "pcie"); - if (IS_ERR(pcie->clk)) { - dev_err(dev, "cannot get platform clock\n"); - return PTR_ERR(pcie->clk); - } - err = clk_prepare_enable(pcie->clk); - if (err) - return err; - pcie->bus_clk = devm_clk_get(dev, "pcie_bus"); if (IS_ERR(pcie->bus_clk)) { dev_err(dev, "cannot get pcie bus clock\n"); - err = PTR_ERR(pcie->bus_clk); - goto fail_clk; + return PTR_ERR(pcie->bus_clk); } err = clk_prepare_enable(pcie->bus_clk); if (err) - goto fail_clk; + return err; i = irq_of_parse_and_map(dev->of_node, 0); if (!i) { @@ -953,8 +942,6 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie) err_map_reg: clk_disable_unprepare(pcie->bus_clk); -fail_clk: - clk_disable_unprepare(pcie->clk); return err; } @@ -1124,22 +1111,22 @@ static int rcar_pcie_probe(struct platform_device *pdev) if (err) goto err_free_bridge; + pm_runtime_enable(pcie->dev); + err = pm_runtime_get_sync(pcie->dev); + if (err < 0) { + dev_err(pcie->dev, "pm_runtime_get_sync failed\n"); + goto err_pm_disable; + } + err = rcar_pcie_get_resources(pcie); if (err < 0) { dev_err(dev, "failed to request resources: %d\n", err); - goto err_free_resource_list; + goto err_pm_put; } err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node); if (err) - goto err_free_resource_list; - - pm_runtime_enable(dev); - err = pm_runtime_get_sync(dev); - if (err < 0) { - dev_err(dev, "pm_runtime_get_sync failed\n"); - goto err_pm_disable; - } + goto err_pm_put; /* Failure to get a link might just be that no cards are inserted */ hw_init_fn = of_device_get_match_data(dev); @@ -1174,9 +1161,8 @@ static int rcar_pcie_probe(struct platform_device *pdev) err_pm_disable: pm_runtime_disable(dev); - -err_free_resource_list: pci_free_resource_list(&pcie->resources); + err_free_bridge: pci_free_host_bridge(bridge); From 0ee40820989b330e24926d82953ffb9e1c7a8425 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sun, 8 Apr 2018 20:04:31 +0200 Subject: [PATCH 02/13] PCI: rcar: Clean up the macros MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch replaces the (1 << n) with BIT(n) and cleans up whitespace, no functional change. Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Cc: Geert Uytterhoeven Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org Reviewed-by: Niklas Söderlund Acked-by: Randy Dunlap Reviewed-by: Geert Uytterhoeven Reviewed-by: Simon Horman Reviewed-by: Simon Horman --- drivers/pci/host/pcie-rcar.c | 53 ++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 26 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 25f68305322c..e403c5206b24 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -11,6 +11,7 @@ * Author: Phil Edworthy */ +#include #include #include #include @@ -30,9 +31,9 @@ #define PCIECAR 0x000010 #define PCIECCTLR 0x000018 -#define CONFIG_SEND_ENABLE (1 << 31) +#define CONFIG_SEND_ENABLE BIT(31) #define TYPE0 (0 << 8) -#define TYPE1 (1 << 8) +#define TYPE1 BIT(8) #define PCIECDR 0x000020 #define PCIEMSR 0x000028 #define PCIEINTXR 0x000400 @@ -44,7 +45,7 @@ #define PCIETSTR 0x02004 #define DATA_LINK_ACTIVE 1 #define PCIEERRFR 0x02020 -#define UNSUPPORTED_REQUEST (1 << 4) +#define UNSUPPORTED_REQUEST BIT(4) #define PCIEMSIFR 0x02044 #define PCIEMSIALR 0x02048 #define MSIFE 1 @@ -57,17 +58,17 @@ /* local address reg & mask */ #define PCIELAR(x) (0x02200 + ((x) * 0x20)) #define PCIELAMR(x) (0x02208 + ((x) * 0x20)) -#define LAM_PREFETCH (1 << 3) -#define LAM_64BIT (1 << 2) -#define LAR_ENABLE (1 << 1) +#define LAM_PREFETCH BIT(3) +#define LAM_64BIT BIT(2) +#define LAR_ENABLE BIT(1) /* PCIe address reg & mask */ #define PCIEPALR(x) (0x03400 + ((x) * 0x20)) #define PCIEPAUR(x) (0x03404 + ((x) * 0x20)) #define PCIEPAMR(x) (0x03408 + ((x) * 0x20)) #define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20)) -#define PAR_ENABLE (1 << 31) -#define IO_SPACE (1 << 8) +#define PAR_ENABLE BIT(31) +#define IO_SPACE BIT(8) /* Configuration */ #define PCICONF(x) (0x010000 + ((x) * 0x4)) @@ -79,23 +80,23 @@ #define IDSETR1 0x011004 #define TLCTLR 0x011048 #define MACSR 0x011054 -#define SPCHGFIN (1 << 4) -#define SPCHGFAIL (1 << 6) -#define SPCHGSUC (1 << 7) +#define SPCHGFIN BIT(4) +#define SPCHGFAIL BIT(6) +#define SPCHGSUC BIT(7) #define LINK_SPEED (0xf << 16) #define LINK_SPEED_2_5GTS (1 << 16) #define LINK_SPEED_5_0GTS (2 << 16) #define MACCTLR 0x011058 -#define SPEED_CHANGE (1 << 24) -#define SCRAMBLE_DISABLE (1 << 27) +#define SPEED_CHANGE BIT(24) +#define SCRAMBLE_DISABLE BIT(27) #define MACS2R 0x011078 #define MACCGSPSETR 0x011084 -#define SPCNGRSN (1 << 31) +#define SPCNGRSN BIT(31) /* R-Car H1 PHY */ #define H1_PCIEPHYADRR 0x04000c -#define WRITE_CMD (1 << 16) -#define PHY_ACK (1 << 24) +#define WRITE_CMD BIT(16) +#define PHY_ACK BIT(24) #define RATE_POS 12 #define LANE_POS 8 #define ADR_POS 0 @@ -107,19 +108,19 @@ #define GEN2_PCIEPHYDATA 0x784 #define GEN2_PCIEPHYCTRL 0x78c -#define INT_PCI_MSI_NR 32 +#define INT_PCI_MSI_NR 32 -#define RCONF(x) (PCICONF(0)+(x)) -#define RPMCAP(x) (PMCAP(0)+(x)) -#define REXPCAP(x) (EXPCAP(0)+(x)) -#define RVCCAP(x) (VCCAP(0)+(x)) +#define RCONF(x) (PCICONF(0) + (x)) +#define RPMCAP(x) (PMCAP(0) + (x)) +#define REXPCAP(x) (EXPCAP(0) + (x)) +#define RVCCAP(x) (VCCAP(0) + (x)) -#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24) -#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19) -#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16) +#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24) +#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19) +#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16) -#define RCAR_PCI_MAX_RESOURCES 4 -#define MAX_NR_INBOUND_MAPS 6 +#define RCAR_PCI_MAX_RESOURCES 4 +#define MAX_NR_INBOUND_MAPS 6 struct rcar_msi { DECLARE_BITMAP(used, INT_PCI_MSI_NR); From 3ad1d32744ef4f0eb92b1989ef7b488cb7dc740d Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Thu, 3 May 2018 22:36:37 +0300 Subject: [PATCH 03/13] PCI: rcar: Poll PHYRDY in rcar_pcie_hw_init() In all the R-Car gen1/2/3 manuals, we are instructed to poll PCIEPHYSR for PHYRDY=1 at an early stage of the PCIEC initialization -- while the driver only does this on R-Car H1 (polling a PHY specific register). Add the PHYRDY polling to rcar_pcie_hw_init(). Note that without the special PHY driver on the R-Car V3H (R8A77980) the PCIEC initialization just freezes the kernel -- adding the PHYRDY polling allows the init code to exit gracefully on timeout (PHY starts powered down after reset on this SoC). Signed-off-by: Sergei Shtylyov Signed-off-by: Lorenzo Pieralisi Reviewed-by: Rob Herring Reviewed-by: Simon Horman --- drivers/pci/host/pcie-rcar.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index e403c5206b24..fa084477a3cd 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -37,6 +37,8 @@ #define PCIECDR 0x000020 #define PCIEMSR 0x000028 #define PCIEINTXR 0x000400 +#define PCIEPHYSR 0x0007f0 +#define PHYRDY BIT(0) #define PCIEMSITXR 0x000840 /* Transfer control */ @@ -527,6 +529,20 @@ static void phy_write_reg(struct rcar_pcie *pcie, phy_wait_for_ack(pcie); } +static int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie) +{ + unsigned int timeout = 10; + + while (timeout--) { + if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY) + return 0; + + msleep(5); + } + + return -ETIMEDOUT; +} + static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie) { unsigned int timeout = 10; @@ -551,6 +567,10 @@ static int rcar_pcie_hw_init(struct rcar_pcie *pcie) /* Set mode */ rcar_pci_write_reg(pcie, 1, PCIEMSR); + err = rcar_pcie_wait_for_phyrdy(pcie); + if (err) + return err; + /* * Initial header for port config space is type 1, set the device * class to match. Hardware takes care of propagating the IDSETR From bd7b6d147a14c308a0227852334e01723451c73c Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Thu, 3 May 2018 22:37:52 +0300 Subject: [PATCH 04/13] PCI: rcar: Remove PHYRDY polling from rcar_pcie_hw_init_h1() Since rcar_pcie_hw_init() is polling PCIEPHYSR.PHYRDY there is no need anymore for polling the PHY specific register in rcar_pcie_hw_init_h1(). Remove it. Signed-off-by: Sergei Shtylyov [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman --- drivers/pci/host/pcie-rcar.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index fa084477a3cd..ac838156d7a4 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -103,7 +103,6 @@ #define LANE_POS 8 #define ADR_POS 0 #define H1_PCIEPHYDOUTR 0x040014 -#define H1_PCIEPHYSR 0x040018 /* R-Car Gen2 PHY */ #define GEN2_PCIEPHYADDR 0x780 @@ -627,8 +626,6 @@ static int rcar_pcie_hw_init(struct rcar_pcie *pcie) static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie) { - unsigned int timeout = 10; - /* Initialize the phy */ phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191); phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180); @@ -647,14 +644,7 @@ static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie) phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F); phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000); - while (timeout--) { - if (rcar_pci_read_reg(pcie, H1_PCIEPHYSR)) - return rcar_pcie_hw_init(pcie); - - msleep(5); - } - - return -ETIMEDOUT; + return rcar_pcie_hw_init(pcie); } static int rcar_pcie_hw_init_gen2(struct rcar_pcie *pcie) From 517ca93a7159eb94eeef829f6ca036456050115c Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Thu, 3 May 2018 22:40:54 +0300 Subject: [PATCH 05/13] PCI: rcar: Add R-Car gen3 PHY support On R-Car gen3 SoCs the PCIe PHY has its own register region, thus we need to add the corresponding code in rcar_pcie_hw_init_gen3() and call devm_phy_optional_get() at the driver's probing time, so that the existing R-Car gen3 device trees (not having a PHY node) would still work (we only need to power up the PHY on R-Car V3H). Signed-off-by: Sergei Shtylyov [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman Reviewed-by: Rob Herring --- .../devicetree/bindings/pci/rcar-pci.txt | 5 ++++ drivers/pci/host/pcie-rcar.c | 27 +++++++++++++++++-- 2 files changed, 30 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt index 1fb614e615da..4376c69ea20a 100644 --- a/Documentation/devicetree/bindings/pci/rcar-pci.txt +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt @@ -32,6 +32,11 @@ compatible: "renesas,pcie-r8a7743" for the R8A7743 SoC; and PCIe bus clocks. - clock-names: from common clock binding: should be "pcie" and "pcie_bus". +Optional properties: +- phys: from common PHY binding: PHY phandle and specifier (only make sense + for R-Car gen3 SoCs where the PCIe PHYs have their own register blocks). +- phy-names: from common PHY binding: should be "pcie". + Example: SoC-specific DT Entry: diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index ac838156d7a4..fe1b1f6f0e53 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -141,6 +142,7 @@ static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip) /* Structure representing the PCIe interface */ struct rcar_pcie { struct device *dev; + struct phy *phy; void __iomem *base; struct list_head resources; int root_bus_nr; @@ -667,6 +669,21 @@ static int rcar_pcie_hw_init_gen2(struct rcar_pcie *pcie) return rcar_pcie_hw_init(pcie); } +static int rcar_pcie_hw_init_gen3(struct rcar_pcie *pcie) +{ + int err; + + err = phy_init(pcie->phy); + if (err) + return err; + + err = phy_power_on(pcie->phy); + if (err) + return err; + + return rcar_pcie_hw_init(pcie); +} + static int rcar_msi_alloc(struct rcar_msi *chip) { int msi; @@ -916,6 +933,10 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie) struct resource res; int err, i; + pcie->phy = devm_phy_optional_get(dev, "pcie"); + if (IS_ERR(pcie->phy)) + return PTR_ERR(pcie->phy); + err = of_address_to_resource(dev->of_node, 0, &res); if (err) return err; @@ -1056,8 +1077,10 @@ static const struct of_device_id rcar_pcie_of_match[] = { .data = rcar_pcie_hw_init_gen2 }, { .compatible = "renesas,pcie-rcar-gen2", .data = rcar_pcie_hw_init_gen2 }, - { .compatible = "renesas,pcie-r8a7795", .data = rcar_pcie_hw_init }, - { .compatible = "renesas,pcie-rcar-gen3", .data = rcar_pcie_hw_init }, + { .compatible = "renesas,pcie-r8a7795", + .data = rcar_pcie_hw_init_gen3 }, + { .compatible = "renesas,pcie-rcar-gen3", + .data = rcar_pcie_hw_init_gen3 }, {}, }; From 9d5014e90e6d62eabe03946dbba27076b77b31e1 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Thu, 3 May 2018 22:43:13 +0300 Subject: [PATCH 06/13] PCI: rcar: Factor out rcar_pcie_hw_init() call rcar_pcie_hw_init_{h1|gen2|gen3}() only differ in the PCIe PHY init code and all end with a call to rcar_pcie_hw_init(), thus it makes sense to move that call into the driver's probe() method and then rename those functions to rcar_pcie_phy_init_{h1|gen2|gen3}(). Signed-off-by: Sergei Shtylyov [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman --- drivers/pci/host/pcie-rcar.c | 42 +++++++++++++++++++----------------- 1 file changed, 22 insertions(+), 20 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index fe1b1f6f0e53..84e68ce613c6 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -626,7 +626,7 @@ static int rcar_pcie_hw_init(struct rcar_pcie *pcie) return 0; } -static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie) +static int rcar_pcie_phy_init_h1(struct rcar_pcie *pcie) { /* Initialize the phy */ phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191); @@ -646,10 +646,10 @@ static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie) phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F); phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000); - return rcar_pcie_hw_init(pcie); + return 0; } -static int rcar_pcie_hw_init_gen2(struct rcar_pcie *pcie) +static int rcar_pcie_phy_init_gen2(struct rcar_pcie *pcie) { /* * These settings come from the R-Car Series, 2nd Generation User's @@ -666,10 +666,10 @@ static int rcar_pcie_hw_init_gen2(struct rcar_pcie *pcie) rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL); rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL); - return rcar_pcie_hw_init(pcie); + return 0; } -static int rcar_pcie_hw_init_gen3(struct rcar_pcie *pcie) +static int rcar_pcie_phy_init_gen3(struct rcar_pcie *pcie) { int err; @@ -677,11 +677,7 @@ static int rcar_pcie_hw_init_gen3(struct rcar_pcie *pcie) if (err) return err; - err = phy_power_on(pcie->phy); - if (err) - return err; - - return rcar_pcie_hw_init(pcie); + return phy_power_on(pcie->phy); } static int rcar_msi_alloc(struct rcar_msi *chip) @@ -1070,17 +1066,18 @@ static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie, } static const struct of_device_id rcar_pcie_of_match[] = { - { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 }, + { .compatible = "renesas,pcie-r8a7779", + .data = rcar_pcie_phy_init_h1 }, { .compatible = "renesas,pcie-r8a7790", - .data = rcar_pcie_hw_init_gen2 }, + .data = rcar_pcie_phy_init_gen2 }, { .compatible = "renesas,pcie-r8a7791", - .data = rcar_pcie_hw_init_gen2 }, + .data = rcar_pcie_phy_init_gen2 }, { .compatible = "renesas,pcie-rcar-gen2", - .data = rcar_pcie_hw_init_gen2 }, + .data = rcar_pcie_phy_init_gen2 }, { .compatible = "renesas,pcie-r8a7795", - .data = rcar_pcie_hw_init_gen3 }, + .data = rcar_pcie_phy_init_gen3 }, { .compatible = "renesas,pcie-rcar-gen3", - .data = rcar_pcie_hw_init_gen3 }, + .data = rcar_pcie_phy_init_gen3 }, {}, }; @@ -1128,7 +1125,7 @@ static int rcar_pcie_probe(struct platform_device *pdev) struct rcar_pcie *pcie; unsigned int data; int err; - int (*hw_init_fn)(struct rcar_pcie *); + int (*phy_init_fn)(struct rcar_pcie *); struct pci_host_bridge *bridge; bridge = pci_alloc_host_bridge(sizeof(*pcie)); @@ -1162,10 +1159,15 @@ static int rcar_pcie_probe(struct platform_device *pdev) if (err) goto err_pm_put; - /* Failure to get a link might just be that no cards are inserted */ - hw_init_fn = of_device_get_match_data(dev); - err = hw_init_fn(pcie); + phy_init_fn = of_device_get_match_data(dev); + err = phy_init_fn(pcie); if (err) { + dev_err(dev, "failed to init PCIe PHY\n"); + goto err_pm_put; + } + + /* Failure to get a link might just be that no cards are inserted */ + if (rcar_pcie_hw_init(pcie)) { dev_info(dev, "PCIe link down\n"); err = -ENODEV; goto err_pm_put; From 2a291ead5e5e699ab1b08fc109e25e721a25b5e5 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Thu, 3 May 2018 22:44:58 +0300 Subject: [PATCH 07/13] DT: pci: rcar-pci: document R8A77980 bindings Document the R-Car V3H (R8A77980) SoC in the R-Car PCIe bindings. Signed-off-by: Sergei Shtylyov Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman Reviewed-by: Rob Herring --- Documentation/devicetree/bindings/pci/rcar-pci.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt index 4376c69ea20a..a5f7fc62d10e 100644 --- a/Documentation/devicetree/bindings/pci/rcar-pci.txt +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt @@ -8,6 +8,7 @@ compatible: "renesas,pcie-r8a7743" for the R8A7743 SoC; "renesas,pcie-r8a7793" for the R8A7793 SoC; "renesas,pcie-r8a7795" for the R8A7795 SoC; "renesas,pcie-r8a7796" for the R8A7796 SoC; + "renesas,pcie-r8a77980" for the R8A77980 SoC; "renesas,pcie-rcar-gen2" for a generic R-Car Gen2 or RZ/G1 compatible device. "renesas,pcie-rcar-gen3" for a generic R-Car Gen3 compatible device. From f7e1c6461e04afb8574cd91864f316cfcb8969f4 Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Wed, 25 Apr 2018 18:21:25 +0300 Subject: [PATCH 08/13] PCI: rcar: Reuse generic pci_parse_request_of_pci_ranges() function The non-functional change removes a custom function to parse and allocate PCI resources in favour of pci_parse_request_of_pci_ranges(). Signed-off-by: Vladimir Zapolskiy Signed-off-by: Lorenzo Pieralisi Acked-by: Simon Horman Reviewed-by: Geert Uytterhoeven --- drivers/pci/host/pcie-rcar.c | 42 +----------------------------------- 1 file changed, 1 insertion(+), 41 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 84e68ce613c6..8d161563bce8 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -1081,44 +1081,6 @@ static const struct of_device_id rcar_pcie_of_match[] = { {}, }; -static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci) -{ - int err; - struct device *dev = pci->dev; - struct device_node *np = dev->of_node; - resource_size_t iobase; - struct resource_entry *win, *tmp; - - err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, - &iobase); - if (err) - return err; - - err = devm_request_pci_bus_resources(dev, &pci->resources); - if (err) - goto out_release_res; - - resource_list_for_each_entry_safe(win, tmp, &pci->resources) { - struct resource *res = win->res; - - if (resource_type(res) == IORESOURCE_IO) { - err = pci_remap_iospace(res, iobase); - if (err) { - dev_warn(dev, "error %d: failed to map resource %pR\n", - err, res); - - resource_list_destroy_entry(win); - } - } - } - - return 0; - -out_release_res: - pci_free_resource_list(&pci->resources); - return err; -} - static int rcar_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1136,9 +1098,7 @@ static int rcar_pcie_probe(struct platform_device *pdev) pcie->dev = dev; - INIT_LIST_HEAD(&pcie->resources); - - err = rcar_pcie_parse_request_of_pci_ranges(pcie); + err = pci_parse_request_of_pci_ranges(dev, &pcie->resources, NULL); if (err) goto err_free_bridge; From 0353ff29b3881a8d9df65ce08a01e636868c1ef2 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 22 May 2018 14:24:20 +0200 Subject: [PATCH 09/13] PCI: rcar: Poll more often in rcar_pcie_wait_for_dl() The data link active signal usually takes ~20 uSec to be asserted, poll the bit more often to avoid useless delays in this function. Use udelay() instead of usleep() for such a small delay as suggested by the timer documentation. Signed-off-by: Marek Vasut [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman Cc: Geert Uytterhoeven Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- drivers/pci/host/pcie-rcar.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 8d161563bce8..5b999fe04c65 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -546,13 +546,14 @@ static int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie) static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie) { - unsigned int timeout = 10; + unsigned int timeout = 10000; while (timeout--) { if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE)) return 0; - msleep(5); + udelay(5); + cpu_relax(); } return -ETIMEDOUT; From 80b8471e69d706d7622bbd633aca611d11b389b7 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Thu, 24 May 2018 16:36:19 +0200 Subject: [PATCH 10/13] PCI: rcar: Pull bus clock enable/disable from rcar_pcie_get_resources() The rcar_pcie_get_resources() is another misnomer with a side effect. The function does not only get resources, but also enables/disables bus clock. This is forgotten in the probe() function though and if anything in probe() fails after rcar_pcie_get_resources() is called, the bus clock are never disabled. This patch pulls the clock handling out of the rcar_pcie_get_resources() and enables clock after all the resources were requested. Moreover, this patch also always disables the clock in case of failure. Reported-by: Geert Uytterhoeven Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman Reviewed-by: Geert Uytterhoeven Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- drivers/pci/host/pcie-rcar.c | 33 ++++++++++++++++----------------- 1 file changed, 16 insertions(+), 17 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 5b999fe04c65..b937467c5c0b 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -947,32 +947,22 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie) dev_err(dev, "cannot get pcie bus clock\n"); return PTR_ERR(pcie->bus_clk); } - err = clk_prepare_enable(pcie->bus_clk); - if (err) - return err; i = irq_of_parse_and_map(dev->of_node, 0); if (!i) { dev_err(dev, "cannot get platform resources for msi interrupt\n"); - err = -ENOENT; - goto err_map_reg; + return -ENOENT; } pcie->msi.irq1 = i; i = irq_of_parse_and_map(dev->of_node, 1); if (!i) { dev_err(dev, "cannot get platform resources for msi interrupt\n"); - err = -ENOENT; - goto err_map_reg; + return -ENOENT; } pcie->msi.irq2 = i; return 0; - -err_map_reg: - clk_disable_unprepare(pcie->bus_clk); - - return err; } static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie, @@ -1116,22 +1106,28 @@ static int rcar_pcie_probe(struct platform_device *pdev) goto err_pm_put; } + err = clk_prepare_enable(pcie->bus_clk); + if (err) { + dev_err(dev, "failed to enable bus clock: %d\n", err); + goto err_pm_put; + } + err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node); if (err) - goto err_pm_put; + goto err_clk_disable; phy_init_fn = of_device_get_match_data(dev); err = phy_init_fn(pcie); if (err) { dev_err(dev, "failed to init PCIe PHY\n"); - goto err_pm_put; + goto err_clk_disable; } /* Failure to get a link might just be that no cards are inserted */ if (rcar_pcie_hw_init(pcie)) { dev_info(dev, "PCIe link down\n"); err = -ENODEV; - goto err_pm_put; + goto err_clk_disable; } data = rcar_pci_read_reg(pcie, MACSR); @@ -1143,16 +1139,19 @@ static int rcar_pcie_probe(struct platform_device *pdev) dev_err(dev, "failed to enable MSI support: %d\n", err); - goto err_pm_put; + goto err_clk_disable; } } err = rcar_pcie_enable(pcie); if (err) - goto err_pm_put; + goto err_clk_disable; return 0; +err_clk_disable: + clk_disable_unprepare(pcie->bus_clk); + err_pm_put: pm_runtime_put(dev); From 53f1aebfbe46ffe422138758c9d015502740f714 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Thu, 24 May 2018 16:36:20 +0200 Subject: [PATCH 11/13] PCI: rcar: Add missing irq_dispose_mapping() into failpath The rcar_pcie_get_resources() is another misnomer with a side effect. The function does not only get resources, but also maps MSI IRQs via irq_of_parse_and_map(). In case anything fails afterward, the IRQ mapping must be disposed through irq_dispose_mapping() which is not done. This patch handles irq_of_parse_and_map() failures in by disposing of the mapping in rcar_pcie_get_resources() as well as in probe. Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Reviewed-by: Simon Horman Reviewed-by: Geert Uytterhoeven Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- drivers/pci/host/pcie-rcar.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index b937467c5c0b..e6c60e14d77d 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -951,18 +951,25 @@ static int rcar_pcie_get_resources(struct rcar_pcie *pcie) i = irq_of_parse_and_map(dev->of_node, 0); if (!i) { dev_err(dev, "cannot get platform resources for msi interrupt\n"); - return -ENOENT; + err = -ENOENT; + goto err_irq1; } pcie->msi.irq1 = i; i = irq_of_parse_and_map(dev->of_node, 1); if (!i) { dev_err(dev, "cannot get platform resources for msi interrupt\n"); - return -ENOENT; + err = -ENOENT; + goto err_irq2; } pcie->msi.irq2 = i; return 0; + +err_irq2: + irq_dispose_mapping(pcie->msi.irq1); +err_irq1: + return err; } static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie, @@ -1109,7 +1116,7 @@ static int rcar_pcie_probe(struct platform_device *pdev) err = clk_prepare_enable(pcie->bus_clk); if (err) { dev_err(dev, "failed to enable bus clock: %d\n", err); - goto err_pm_put; + goto err_unmap_msi_irqs; } err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node); @@ -1152,6 +1159,10 @@ static int rcar_pcie_probe(struct platform_device *pdev) err_clk_disable: clk_disable_unprepare(pcie->bus_clk); +err_unmap_msi_irqs: + irq_dispose_mapping(pcie->msi.irq2); + irq_dispose_mapping(pcie->msi.irq1); + err_pm_put: pm_runtime_put(dev); From 1aea58be739816f05232c64f970784d75a84cd96 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Thu, 24 May 2018 16:36:21 +0200 Subject: [PATCH 12/13] PCI: rcar: Teardown MSI setup if rcar_pcie_enable() fails If the rcar_pcie_enable() fails and MSIs are enabled, the setup done in rcar_pcie_enable_msi() is never undone. Add a function to tear down the MSI setup by disabling the MSI handling in the PCIe block, deallocating the pages requested for the MSIs and zapping the IRQ mapping. Reported-by: Geert Uytterhoeven Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Reviewed-by: Geert Uytterhoeven Reviewed-by: Simon Horman Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- drivers/pci/host/pcie-rcar.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index e6c60e14d77d..4843a4dc6059 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -924,6 +924,28 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie) return err; } +static void rcar_pcie_teardown_msi(struct rcar_pcie *pcie) +{ + struct rcar_msi *msi = &pcie->msi; + int irq, i; + + /* Disable all MSI interrupts */ + rcar_pci_write_reg(pcie, 0, PCIEMSIIER); + + /* Disable address decoding of the MSI interrupt, MSIFE */ + rcar_pci_write_reg(pcie, 0, PCIEMSIALR); + + free_pages(msi->pages, 0); + + for (i = 0; i < INT_PCI_MSI_NR; i++) { + irq = irq_find_mapping(msi->domain, i); + if (irq > 0) + irq_dispose_mapping(irq); + } + + irq_domain_remove(msi->domain); +} + static int rcar_pcie_get_resources(struct rcar_pcie *pcie) { struct device *dev = pcie->dev; @@ -1152,10 +1174,14 @@ static int rcar_pcie_probe(struct platform_device *pdev) err = rcar_pcie_enable(pcie); if (err) - goto err_clk_disable; + goto err_msi_teardown; return 0; +err_msi_teardown: + if (IS_ENABLED(CONFIG_PCI_MSI)) + rcar_pcie_teardown_msi(pcie); + err_clk_disable: clk_disable_unprepare(pcie->bus_clk); From 0bbf6b9230df602616a6c6f5861e8964e9162f4a Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Thu, 24 May 2018 16:36:23 +0200 Subject: [PATCH 13/13] PCI: rcar: Remove IRQ mappings in rcar_pcie_enable_msi() failpath The rcar_pcie_enable_msi() creates IRQ mappings using irq_create_mapping() before requesting the IRQs using devm_request_irq(). If devm_request_irq() fails for some reason, rcar_pcie_enable_msi() does not remove the mapping. Pull out the code for disposing IRQ mappings from rcar_pcie_teardown_msi() into a separate function and call it from both rcar_pcie_teardown_msi() and rcar_pcie_enable_msi() failpath to remove the mappings correctly. Reported-by: Geert Uytterhoeven Signed-off-by: Marek Vasut Signed-off-by: Lorenzo Pieralisi Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- drivers/pci/host/pcie-rcar.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 4843a4dc6059..636c3c5095d2 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -866,6 +866,20 @@ static const struct irq_domain_ops msi_domain_ops = { .map = rcar_msi_map, }; +static void rcar_pcie_unmap_msi(struct rcar_pcie *pcie) +{ + struct rcar_msi *msi = &pcie->msi; + int i, irq; + + for (i = 0; i < INT_PCI_MSI_NR; i++) { + irq = irq_find_mapping(msi->domain, i); + if (irq > 0) + irq_dispose_mapping(irq); + } + + irq_domain_remove(msi->domain); +} + static int rcar_pcie_enable_msi(struct rcar_pcie *pcie) { struct device *dev = pcie->dev; @@ -920,14 +934,13 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie) return 0; err: - irq_domain_remove(msi->domain); + rcar_pcie_unmap_msi(pcie); return err; } static void rcar_pcie_teardown_msi(struct rcar_pcie *pcie) { struct rcar_msi *msi = &pcie->msi; - int irq, i; /* Disable all MSI interrupts */ rcar_pci_write_reg(pcie, 0, PCIEMSIIER); @@ -937,13 +950,7 @@ static void rcar_pcie_teardown_msi(struct rcar_pcie *pcie) free_pages(msi->pages, 0); - for (i = 0; i < INT_PCI_MSI_NR; i++) { - irq = irq_find_mapping(msi->domain, i); - if (irq > 0) - irq_dispose_mapping(irq); - } - - irq_domain_remove(msi->domain); + rcar_pcie_unmap_msi(pcie); } static int rcar_pcie_get_resources(struct rcar_pcie *pcie)