This is alternative SH7751 PCI driver. Existing driver (arch/sh/drivers/pci/pci-sh7751) use SH specific interface. But this driver using common PCI interface. It more mordan and generic. Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx> --- .../devicetree/bindings/pci/sh7751-pci.txt | 51 +++ arch/sh/boards/Kconfig | 1 + drivers/pci/host/Kconfig | 7 + drivers/pci/host/Makefile | 1 + drivers/pci/host/pci-sh7751.c | 443 +++++++++++++++++++++ 5 files changed, 503 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/sh7751-pci.txt create mode 100644 drivers/pci/host/pci-sh7751.c diff --git a/Documentation/devicetree/bindings/pci/sh7751-pci.txt b/Documentation/devicetree/bindings/pci/sh7751-pci.txt new file mode 100644 index 0000000..c3ec71a --- /dev/null +++ b/Documentation/devicetree/bindings/pci/sh7751-pci.txt @@ -0,0 +1,51 @@ +* Renesas SH7751 PCI host interfaces + +Required properties: + - compatible: "renesas,sh7751-pci" is required. + And board specific compatible if fixup required. + + - reg: base address and length of the PCI controller registers. + - #address-cells: set to <2> + - #size-cells: set to <1> + - bus-range: PCI bus numbers covered + - device_type: set to "pci" + - ranges: ranges for the PCI memory and I/O regions. + - interrupt-map-mask and interrupt-map: standard PCI properties + to define the mapping of the PCI interface to interrupt + numbers. + +Example: + pci: pci-controller@fe200000 { + compatible = "renesas,sh7751-pci", "iodata,landisk"; + device_type = "pci"; + bus-range = <0 0>; + #address-cells = <2>; + #size-cells = <1>; + ranges = <0x02000000 0x00000000 0xfd000000 0xfd000000 0x00000000 0x01000000>, + <0x01000000 0x00000000 0xfe240000 0x00000000 0x00000000 0x00040000>; + reg = <0xfe200000 0x0400>, + <0x0c000000 0x04000000>, + <0xff800000 0x0030>; + #interrupt-cells = <1>; + interrupt-map-mask = <0x1800 0 7>; + interrupt-map = <0x0000 0 1 &cpldintc evt2irq(0x2a0) 0 + 0x0000 0 2 &cpldintc evt2irq(0x2c0) 0 + 0x0000 0 3 &cpldintc evt2irq(0x2e0) 0 + 0x0000 0 4 &cpldintc evt2irq(0x300) 0 + + 0x0800 0 1 &cpldintc evt2irq(0x2c0) 0 + 0x0800 0 2 &cpldintc evt2irq(0x2e0) 0 + 0x0800 0 3 &cpldintc evt2irq(0x300) 0 + 0x0800 0 4 &cpldintc evt2irq(0x2a0) 0 + + 0x1000 0 1 &cpldintc evt2irq(0x2e0) 0 + 0x1000 0 2 &cpldintc evt2irq(0x300) 0 + 0x1000 0 3 &cpldintc evt2irq(0x2a0) 0 + 0x1000 0 4 &cpldintc evt2irq(0x2c0) 0 + + 0x1800 0 1 &cpldintc evt2irq(0x300) 0 + 0x1800 0 2 &cpldintc evt2irq(0x2a0) 0 + 0x1800 0 3 &cpldintc evt2irq(0x2c0) 0 + 0x1800 0 4 &cpldintc evt2irq(0x2e0) 0>; + }; +}; diff --git a/arch/sh/boards/Kconfig b/arch/sh/boards/Kconfig index b6ff9df..cfde921 100644 --- a/arch/sh/boards/Kconfig +++ b/arch/sh/boards/Kconfig @@ -14,6 +14,7 @@ config SH_DEVICE_TREE select GENERIC_CALIBRATE_DELAY select GENERIC_IOMAP select COMMON_CLK + select SYS_SUPPORTS_PCI help Select Board Described by Device Tree to build a kernel that does not hard-code any board-specific knowledge but instead uses diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig index 7a0780d..a8596db 100644 --- a/drivers/pci/host/Kconfig +++ b/drivers/pci/host/Kconfig @@ -231,4 +231,11 @@ config PCI_HOST_THUNDER_ECAM help Say Y here if you want ECAM support for CN88XX-Pass-1.x Cavium Thunder SoCs. +config PCI_SH7751 + bool "Renesas SH7751 On-Chip PCI controller" + depends on OF && SUPERH + select PCI_HOST_COMMON + help + Say Y here if you want PCI support on SH7751. + endmenu diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile index d85b5fa..91268cb 100644 --- a/drivers/pci/host/Makefile +++ b/drivers/pci/host/Makefile @@ -28,3 +28,4 @@ obj-$(CONFIG_PCI_HISI) += pcie-hisi.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o +obj-$(CONFIG_PCI_SH7751) += pci-sh7751.o diff --git a/drivers/pci/host/pci-sh7751.c b/drivers/pci/host/pci-sh7751.c new file mode 100644 index 0000000..c029e5b --- /dev/null +++ b/drivers/pci/host/pci-sh7751.c @@ -0,0 +1,443 @@ +/* + * SH7751 PCI driver + * Copyright (C) 2016 Yoshinori Sato + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_pci.h> +#include <linux/of_platform.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include "pci-host-common.h" + +#define SH4_PCICR 0x100 /* PCI Control Register */ + #define SH4_PCICR_PREFIX 0xA5000000 /* CR prefix for write */ + #define SH4_PCICR_FTO BIT(10) /* TRDY/IRDY Enable */ + #define SH4_PCICR_TRSB BIT(9) /* Target Read Single */ + #define SH4_PCICR_BSWP BIT(8) /* Target Byte Swap */ + #define SH4_PCICR_PLUP BIT(7) /* Enable PCI Pullup */ + #define SH4_PCICR_ARBM BIT(6) /* PCI Arbitration Mode */ +#define SH4_PCICR_MD (BIT(4) | BIT(5)) /* MD9 and MD10 status */ + #define SH4_PCICR_SERR BIT(3) /* SERR output assert */ + #define SH4_PCICR_INTA BIT(2) /* INTA output assert */ + #define SH4_PCICR_PRST BIT(1) /* PCI Reset Assert */ + #define SH4_PCICR_CFIN BIT(0) /* Central Fun. Init Done */ +#define SH4_PCILSR0 0x104 /* PCI Local Space Register0 */ +#define SH4_PCILSR1 0x108 /* PCI Local Space Register1 */ +#define SH4_PCILAR0 0x10C /* PCI Local Addr Register1 */ +#define SH4_PCILAR1 0x110 /* PCI Local Addr Register1 */ +#define SH4_PCIPAR 0x1C0 /* PIO Address Register */ + #define SH4_PCIPAR_CFGEN 0x80000000 /* Configuration Enable */ + #define SH4_PCIPAR_BUSNO 0x00FF0000 /* Config. Bus Number */ + #define SH4_PCIPAR_DEVNO 0x0000FF00 /* Config. Device Number */ + #define SH4_PCIPAR_REGAD 0x000000FC /* Register Address Number */ +#define SH4_PCIMBR 0x1C4 /* Memory Base Address */ + #define SH4_PCIMBR_MASK 0xFF000000 /* Memory Space Mask */ + #define SH4_PCIMBR_LOCK 0x00000001 /* Lock Memory Space */ +#define SH4_PCIIOBR 0x1C8 /* I/O Base Address Register */ + #define SH4_PCIIOBR_MASK 0xFFFC0000 /* IO Space Mask */ + #define SH4_PCIIOBR_LOCK 0x00000001 /* Lock IO Space */ +#define SH4_PCIPINT 0x1CC /* Power Mgmnt Int. Register */ + #define SH4_PCIPINT_D3 0x00000002 /* D3 Pwr Mgmt. Interrupt */ + #define SH4_PCIPINT_D0 0x00000001 /* D0 Pwr Mgmt. Interrupt */ +#define SH4_PCIPINTM 0x1D0 /* Power Mgmnt Mask Register */ +#define SH4_PCICLKR 0x1D4 /* Clock Ctrl. Register */ + #define SH4_PCICLKR_PCSTP 0x00000002 /* PCI Clock Stop */ + #define SH4_PCICLKR_BCSTP 0x00000001 /* BCLK Clock Stop */ +/* For definitions of BCR, MCR see ... */ +#define SH4_PCIBCR1 0x1E0 /* Memory BCR1 Register */ + #define SH4_PCIMBR0 SH4_PCIBCR1 +#define SH4_PCIBCR2 0x1E4 /* Memory BCR2 Register */ + #define SH4_PCIMBMR0 SH4_PCIBCR2 +#define SH4_PCIWCR1 0x1E8 /* Wait Control 1 Register */ +#define SH4_PCIWCR2 0x1EC /* Wait Control 2 Register */ +#define SH4_PCIWCR3 0x1F0 /* Wait Control 3 Register */ + #define SH4_PCIMBR2 SH4_PCIWCR3 +#define SH4_PCIMCR 0x1F4 /* Memory Control Register */ +#define SH4_PCIBCR3 0x1f8 /* Memory BCR3 Register */ +#define SH4_PCIPCTR 0x200 /* Port Control Register */ + #define SH4_PCIPCTR_P2EN 0x000400000 /* Port 2 Enable */ + #define SH4_PCIPCTR_P1EN 0x000200000 /* Port 1 Enable */ + #define SH4_PCIPCTR_P0EN 0x000100000 /* Port 0 Enable */ + #define SH4_PCIPCTR_P2UP 0x000000020 /* Port2 Pull Up Enable */ + #define SH4_PCIPCTR_P2IO 0x000000010 /* Port2 Output Enable */ + #define SH4_PCIPCTR_P1UP 0x000000008 /* Port1 Pull Up Enable */ + #define SH4_PCIPCTR_P1IO 0x000000004 /* Port1 Output Enable */ + #define SH4_PCIPCTR_P0UP 0x000000002 /* Port0 Pull Up Enable */ + #define SH4_PCIPCTR_P0IO 0x000000001 /* Port0 Output Enable */ +#define SH4_PCIPDTR 0x204 /* Port Data Register */ + #define SH4_PCIPDTR_PB5 0x000000020 /* Port 5 Enable */ + #define SH4_PCIPDTR_PB4 0x000000010 /* Port 4 Enable */ + #define SH4_PCIPDTR_PB3 0x000000008 /* Port 3 Enable */ + #define SH4_PCIPDTR_PB2 0x000000004 /* Port 2 Enable */ + #define SH4_PCIPDTR_PB1 0x000000002 /* Port 1 Enable */ + #define SH4_PCIPDTR_PB0 0x000000001 /* Port 0 Enable */ +#define SH4_PCIPDR 0x220 /* Port IO Data Register */ + +/* Platform Specific Values */ +#define SH7751_VENDOR_ID 0x1054 +#define SH7751_DEVICE_ID 0x3505 +#define SH7751R_DEVICE_ID 0x350e + +/* Memory Control Registers */ +#define SH7751_BCR1 0x0000 /* Memory BCR1 Register */ +#define SH7751_BCR2 0x0004 /* Memory BCR2 Register */ +#define SH7751_BCR3 0x0050 /* Memory BCR3 Register */ +#define SH7751_WCR1 0x0008 /* Wait Control 1 Register */ +#define SH7751_WCR2 0x000C /* Wait Control 2 Register */ +#define SH7751_WCR3 0x0010 /* Wait Control 3 Register */ +#define SH7751_MCR 0x0014 /* Memory Control Register */ + +/* General Memory Config Addresses */ +#define SH7751_CS0_BASE_ADDR 0x0 +#define SH7751_MEM_REGION_SIZE 0x04000000 +#define SH7751_CS1_BASE_ADDR \ + (SH7751_CS0_BASE_ADDR + SH7751_MEM_REGION_SIZE) +#define SH7751_CS2_BASE_ADDR \ + (SH7751_CS1_BASE_ADDR + SH7751_MEM_REGION_SIZE) +#define SH7751_CS3_BASE_ADDR \ + (SH7751_CS2_BASE_ADDR + SH7751_MEM_REGION_SIZE) +#define SH7751_CS4_BASE_ADDR \ + (SH7751_CS3_BASE_ADDR + SH7751_MEM_REGION_SIZE) +#define SH7751_CS5_BASE_ADDR \ + (SH7751_CS4_BASE_ADDR + SH7751_MEM_REGION_SIZE) +#define SH7751_CS6_BASE_ADDR \ + (SH7751_CS5_BASE_ADDR + SH7751_MEM_REGION_SIZE) + +#define pcic_writel(val, reg) __raw_writel(val, pci_reg_base + (reg)) +#define pcic_readl(reg) __raw_readl(pci_reg_base + (reg)) + +unsigned long PCIBIOS_MIN_IO; +unsigned long PCIBIOS_MIN_MEM; +DEFINE_RAW_SPINLOCK(pci_config_lock); + +/* + * PCIC fixups + */ + +#define PCIMCR_MRSET 0x40000000 +#define PCIMCR_RFSH 0x00000004 + +static void __init landisk_fixup(void __iomem *pci_reg_base, void __iomem *bcr) +{ + unsigned long bcr1, mcr; + + bcr1 = __raw_readl(bcr + SH7751_BCR1); + bcr1 |= 0x00080000; /* Enable Bit 19 BREQEN, set PCIC to slave */ + pcic_writel(bcr1, SH4_PCIBCR1); + + mcr = __raw_readl(bcr + SH7751_MCR); + mcr &= (~PCIMCR_MRSET) & (~PCIMCR_RFSH); + pcic_writel(mcr, SH4_PCIMCR); + + pcic_writel(0x0c000000, PCI_BASE_ADDRESS_1); + pcic_writel(0xd0000000, PCI_BASE_ADDRESS_2); + pcic_writel(0x0c000000, SH4_PCILAR0); + pcic_writel(0x00000000, SH4_PCILAR1); +} + +static __initconst const struct fixups { + char *compatible; + void (*fixup)(void __iomem *, void __iomem *); +} fixup_list[] = { + { + .compatible = "iodata,landisk", + .fixup = landisk_fixup, + }, +}; + +static __init void pcic_fixups(struct device_node *np, + void __iomem *pcic, void __iomem *bcr) +{ + int i; + const struct fixups *f = fixup_list; + + for (i = 0; i < ARRAY_SIZE(fixup_list); i++) { + if (of_device_is_compatible(np, f->compatible)) { + f->fixup(pcic, bcr); + break; + } + } +} + +/* + * Direct access to PCI hardware... + */ +#define CONFIG_CMD(bus, devfn, where) \ + (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3)) + +/* + * Functions for accessing PCI configuration space with type 1 accesses + */ +static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 *val) +{ + struct gen_pci *pci = bus->sysdata; + void __iomem *pci_reg_base; + unsigned long flags; + u32 data; + + pci_reg_base = ioremap(pci->cfg.res.start, + pci->cfg.res.end - pci->cfg.res.start); + + /* + * PCIPDR may only be accessed as 32 bit words, + * so we must do byte alignment by hand + */ + raw_spin_lock_irqsave(&pci_config_lock, flags); + pcic_writel(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR); + data = pcic_readl(SH4_PCIPDR); + raw_spin_unlock_irqrestore(&pci_config_lock, flags); + + switch (size) { + case 1: + *val = (data >> ((where & 3) << 3)) & 0xff; + break; + case 2: + *val = (data >> ((where & 2) << 3)) & 0xffff; + break; + case 4: + *val = data; + break; + default: + return PCIBIOS_FUNC_NOT_SUPPORTED; + } + + return PCIBIOS_SUCCESSFUL; +} + +/* + * Since SH4 only does 32bit access we'll have to do a read, + * mask,write operation. + * We'll allow an odd byte offset, though it should be illegal. + */ +static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn, + int where, int size, u32 val) +{ + struct gen_pci *pci = bus->sysdata; + void __iomem *pci_reg_base; + unsigned long flags; + int shift; + u32 data; + + pci_reg_base = ioremap(pci->cfg.res.start, + pci->cfg.res.end - pci->cfg.res.start); + + raw_spin_lock_irqsave(&pci_config_lock, flags); + pcic_writel(CONFIG_CMD(bus, devfn, where), SH4_PCIPAR); + data = pcic_readl(SH4_PCIPDR); + raw_spin_unlock_irqrestore(&pci_config_lock, flags); + + switch (size) { + case 1: + shift = (where & 3) << 3; + data &= ~(0xff << shift); + data |= ((val & 0xff) << shift); + break; + case 2: + shift = (where & 2) << 3; + data &= ~(0xffff << shift); + data |= ((val & 0xffff) << shift); + break; + case 4: + data = val; + break; + default: + return PCIBIOS_FUNC_NOT_SUPPORTED; + } + + pcic_writel(data, SH4_PCIPDR); + + return PCIBIOS_SUCCESSFUL; +} + +static struct gen_pci_cfg_bus_ops pci_sh7751_ops = { + .ops = { + .read = sh4_pci_read, + .write = sh4_pci_write, + }, +}; + +/* + * Called after each bus is probed, but before its children + * are examined. + */ +void pcibios_fixup_bus(struct pci_bus *bus) +{ +} + +/* + * We need to avoid collisions with `mirrored' VGA ports + * and other strange ISA hardware, so we always want the + * addresses to be allocated in the 0x000-0x0ff region + * modulo 0x400. + */ +resource_size_t pcibios_align_resource(void *data, + const struct resource *res, + resource_size_t size, + resource_size_t align) +{ + resource_size_t start = res->start; + + return start; +} + +int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, + enum pci_mmap_state mmap_state, int write_combine) +{ + /* + * I/O space can be accessed via normal processor loads and stores on + * this platform but for now we elect not to do this and portable + * drivers should not do this anyway. + */ + if (mmap_state == pci_mmap_io) + return -EINVAL; + + /* + * Ignore write-combine; for now only return uncached mappings. + */ + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); +} + +static const struct of_device_id sh7751_pci_of_match[] = { + { .compatible = "renesas,sh7751-pci", }, + { }, +}; +MODULE_DEVICE_TABLE(of, sh7751_pci_of_match); + +static void __init set_pci_bcr(void __iomem *pci_reg_base, + void __iomem *bcr, + unsigned int area) +{ + unsigned long word; + + word = __raw_readl(bcr + SH7751_BCR1); + /* check BCR for SDRAM in area */ + if (((word >> area) & 1) == 0) { + pr_info("PCI: Area %d is not configured for SDRAM. BCR1=0x%lx\n", + area, word); + return; + } + pcic_writel(word, SH4_PCIBCR1); + + word = __raw_readw(bcr + SH7751_BCR2); + /* check BCR2 for 32bit SDRAM interface*/ + if (((word >> (area << 1)) & 0x3) != 0x3) { + pr_info("PCI: Area %d is not 32 bit SDRAM. BCR2=0x%lx\n", + area, word); + return; + } + pcic_writel(word, SH4_PCIBCR2); +} + +static __init int sh7751_pci_probe(struct platform_device *pdev) +{ + struct resource *res, *wres; + u32 id; + u32 reg, word; + void __iomem *pci_reg_base; + void __iomem *bcr; + struct gen_pci *pci; + + pci = devm_kzalloc(&pdev->dev, sizeof(*pci), GFP_KERNEL); + if (!pci) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pci_reg_base = ioremap(res->start, res->end - res->start); + if (IS_ERR(pci_reg_base)) + return PTR_ERR(pci_reg_base); + + wres = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (IS_ERR(wres)) + return PTR_ERR(wres); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + bcr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(bcr)) + return PTR_ERR(bcr); + + /* check for SH7751/SH7751R hardware */ + id = pcic_readl(PCI_VENDOR_ID); + if (id != ((SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID) && + id != ((SH7751R_DEVICE_ID << 16) | SH7751_VENDOR_ID)) { + pr_warn("PCI: This is not an SH7751(R)\n"); + return -ENODEV; + } + dev_info(&pdev->dev, "PCI core found at %pR\n", + pci_reg_base); + + /* Set the BCRs to enable PCI access */ + reg = __raw_readl(bcr); + reg |= 0x80000; + __raw_writel(reg, bcr); + + /* Turn the clocks back on (not done in reset)*/ + pcic_writel(0, SH4_PCICLKR); + /* Clear Powerdown IRQs (not done in reset) */ + word = SH4_PCIPINT_D3 | SH4_PCIPINT_D0; + pcic_writel(word, SH4_PCIPINT); + + /* set the command/status bits to: + * Wait Cycle Control + Parity Enable + Bus Master + + * Mem space enable + */ + word = PCI_COMMAND_WAIT | PCI_COMMAND_PARITY | + PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; + pcic_writel(word, PCI_COMMAND); + + /* define this host as the host bridge */ + word = PCI_BASE_CLASS_BRIDGE << 24; + pcic_writel(word, PCI_CLASS_REVISION); + + /* Set IO and Mem windows to local address + * Make PCI and local address the same for easy 1 to 1 mapping + */ + word = wres->end - wres->start - 1; + pcic_writel(word, SH4_PCILSR0); + /* Set the values on window 0 PCI config registers */ + word = P2SEGADDR(wres->start); + pcic_writel(word, SH4_PCILAR0); + pcic_writel(word, PCI_BASE_ADDRESS_1); + + set_pci_bcr(pci_reg_base, bcr, (wres->start >> 27) & 0x07); + + /* configure the wait control registers */ + word = __raw_readl(bcr + SH7751_WCR1); + pcic_writel(word, SH4_PCIWCR1); + word = __raw_readl(bcr + SH7751_WCR2); + pcic_writel(word, SH4_PCIWCR2); + word = __raw_readl(bcr + SH7751_WCR3); + pcic_writel(word, SH4_PCIWCR3); + word = __raw_readl(bcr + SH7751_MCR); + pcic_writel(word, SH4_PCIMCR); + + pcic_fixups(pdev->dev.of_node, pci_reg_base, bcr); + + /* + * SH7751 init done, set central function init complete + * use round robin mode to stop a device starving/overruning + */ + word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_ARBM; + pcic_writel(word, SH4_PCICR); + + pci->cfg.ops = &pci_sh7751_ops; + return pci_host_common_probe(pdev, pci); +} + +static __refdata struct platform_driver sh7751_pci_driver = { + .driver = { + .name = "sh7751-pci", + .of_match_table = sh7751_pci_of_match, + }, + .probe = sh7751_pci_probe, +}; +builtin_platform_driver(sh7751_pci_driver); -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html