From patchwork Tue Dec 5 09:45:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshinori Sato X-Patchwork-Id: 13479797 X-Patchwork-Delegate: kw@linux.com Received: from sakura.ysato.name (ik1-413-38519.vs.sakura.ne.jp [153.127.30.23]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 704C7127; Tue, 5 Dec 2023 01:55:35 -0800 (PST) Received: from SIOS1075.ysato.name (ZM005235.ppp.dion.ne.jp [222.8.5.235]) by sakura.ysato.name (Postfix) with ESMTPSA id 4F0BC1C0559; Tue, 5 Dec 2023 18:46:23 +0900 (JST) From: Yoshinori Sato To: linux-sh@vger.kernel.org Cc: Yoshinori Sato , Damien Le Moal , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Geert Uytterhoeven , Michael Turquette , Stephen Boyd , David Airlie , Daniel Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Thomas Gleixner , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Bjorn Helgaas , Greg Kroah-Hartman , Jiri Slaby , Magnus Damm , Daniel Lezcano , Rich Felker , John Paul Adrian Glaubitz , Lee Jones , Helge Deller , Heiko Stuebner , Jernej Skrabec , Chris Morgan , Linus Walleij , Randy Dunlap , Arnd Bergmann , Hyeonggon Yoo <42.hyeyoo@gmail.com>, David Rientjes , Vlastimil Babka , Baoquan He , Andrew Morton , Guenter Roeck , Stephen Rothwell , Guo Ren , Javier Martinez Canillas , Azeem Shaikh , Palmer Dabbelt , Bin Meng , Max Filippov , Tom Rix , Herve Codina , Jacky Huang , Lukas Bulwahn , Jonathan Corbet , Biju Das , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Sam Ravnborg , Michael Karcher , Sergey Shtylyov , Laurent Pinchart , linux-ide@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-pci@vger.kernel.org, linux-serial@vger.kernel.org, linux-fbdev@vger.kernel.org Subject: [DO NOT MERGE v5 11/37] pci: pci-sh7751: Add SH7751 PCI driver Date: Tue, 5 Dec 2023 18:45:30 +0900 Message-Id: <602e1ba4f02489fcbc47e8f9904f3c1db1c9f14a.1701768028.git.ysato@users.sourceforge.jp> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Renesas SH7751 CPU Internal PCI Controller driver. Signed-off-by: Yoshinori Sato --- drivers/pci/controller/Kconfig | 9 + drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pci-sh7751.c | 302 ++++++++++++++++++++++++++++ drivers/pci/controller/pci-sh7751.h | 76 +++++++ 4 files changed, 388 insertions(+) create mode 100644 drivers/pci/controller/pci-sh7751.c create mode 100644 drivers/pci/controller/pci-sh7751.h diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index e534c02ee34f..a2fd917a2e03 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -353,6 +353,15 @@ config PCIE_XILINX_CPM Say 'Y' here if you want kernel support for the Xilinx Versal CPM host bridge. +config PCI_SH7751 + bool "Renesas SH7751 PCI controller" + depends on OF + depends on CPU_SUBTYPE_SH7751 || CPU_SUBTYPE_SH7751R || COMPILE_TEST + select PCI_HOST_COMMON + help + Say 'Y' here if you want kernel to support the Renesas SH7751 PCI + Host Bridge driver. + source "drivers/pci/controller/cadence/Kconfig" source "drivers/pci/controller/dwc/Kconfig" source "drivers/pci/controller/mobiveil/Kconfig" diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index f2b19e6174af..aa97e5d74e58 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o obj-$(CONFIG_PCIE_APPLE) += pcie-apple.o obj-$(CONFIG_PCIE_MT7621) += pcie-mt7621.o +obj-$(CONFIG_PCI_SH7751) += pci-sh7751.o # pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW obj-y += dwc/ diff --git a/drivers/pci/controller/pci-sh7751.c b/drivers/pci/controller/pci-sh7751.c new file mode 100644 index 000000000000..6bc022ccf64c --- /dev/null +++ b/drivers/pci/controller/pci-sh7751.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SH7751 PCI driver + * Copyright (C) 2023 Yoshinori Sato + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "pci-sh7751.h" + +#define pcic_writel(val, base, reg) __raw_writel(val, base + (reg)) +#define pcic_readl(base, reg) __raw_readl(base + (reg)) + +/* + * PCIC fixups + */ + +static inline void pci_fixup_write_regs(struct device_node *np, + const char *prop, + void __iomem *pcic, int reg, + int nr_regs) +{ + int i; + u32 val; + + for (i = 0; i < nr_regs; i++) { + if (of_property_read_u32_index(np, prop, i, &val)) + pcic_writel(val, pcic, reg + i * 4); + } +} + +#define SH7751_NUM_CONFIG 18 +static void pcic_fixups(struct device_node *np, + void __iomem *pcic, void __iomem *bsc) +{ + unsigned long bcr1, mcr; + u32 val; + int i, r; + u32 pci_config[SH7751_NUM_CONFIG * 2]; + + const struct { + const char *name; + int reg; + int nr; + } reg_prop[] = { + /* + * The bus timing uses the bootloader settings, + * so do not change them here. + */ + { "renesas,intm", PCIC_PCIINTM, 1, }, + { "renesas,aintm", PCIC_PCIAINTM, 1, }, + { "renesas,lsr", PCIC_PCILSR0, 2, }, + { "renesas,lar", PCIC_PCILAR0, 2, }, + { "renesas,dmabt", PCIC_PCIDMABT, 1, }, + { "renesas,pintm", PCIC_PCIPINTM, 1, }, + }; + + if (of_property_read_u32(np, "renesas,bcr1", &val)) { + bcr1 = ioread32(bsc + BSC_BCR1); + bcr1 |= val; + pcic_writel(bcr1, pcic, PCIC_PCIBCR1); + } + if (of_property_read_u32(np, "renesas,clkr", &val)) { + val = (val & 0xffffff); + pcic_writel(PCIC_WE_KEY | val, pcic, PCIC_PCICLKR); + } + for (i = 0; i < ARRAY_SIZE(reg_prop); i++) + pci_fixup_write_regs(np, reg_prop[i].name, pcic, + reg_prop[i].reg, reg_prop[i].nr); + + memset(pci_config, 0, sizeof(pci_config)); + if (of_property_read_u32_array(np, "renesas,config", + pci_config, SH7751_NUM_CONFIG) == 0) { + for (i = 0; i < SH7751_NUM_CONFIG; i++) { + r = pci_config[i * 2]; + /* CONFIG0 is read-only, so make it a sentinel. */ + if (r == 0) + break; + pcic_writel(pci_config[i * 2 + 1], pcic, r * 4); + } + } + + if (of_property_read_u32(np, "renesas,mcrmask", &val)) { + mcr = ioread32(bsc + BSC_MCR); + mcr &= ~val; + pcic_writel(mcr, pcic, PCIC_PCIMCR); + } +} + +/* + * 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. + */ +#define IO_REGION_BASE 0x1000 +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; + + if (res->flags & IORESOURCE_IO) { + if (start < PCIBIOS_MIN_IO + IO_REGION_BASE) + start = PCIBIOS_MIN_IO + IO_REGION_BASE; + + /* + * Put everything into 0x00-0xff region modulo 0x400. + */ + if (start & 0x300) + start = (start + 0x3ff) & ~0x3ff; + } + + return start; +} + +static int setup_pci_bsc(struct device *dev, void __iomem *pcic, + void __iomem *bsc, unsigned int area, bool bcr3) +{ + unsigned long word; + + word = __raw_readl(bsc + BSC_BCR1); + /* check BCR for SDRAM in area */ + if (((word >> area) & 1) == 0) { + dev_info(dev, "PCI: Area %d is not configured for SDRAM. BCR1=0x%lx\n", + area, word); + return 0; + } + pcic_writel(word, pcic, PCIC_PCIBCR1); + + word = __raw_readw(bsc + BSC_BCR2); + /* check BCR2 for 32bit SDRAM interface*/ + if (((word >> (area << 1)) & 0x3) != 0x3) { + dev_info(dev, "PCI: Area %d is not 32 bit SDRAM. BCR2=0x%lx\n", + area, word); + return 0; + } + pcic_writel(word, pcic, PCIC_PCIBCR2); + + if (bcr3) { + /* BCR3 have only SH7751R */ + word = __raw_readw(bsc + BSC_BCR3); + pcic_writel(word, pcic, PCIC_PCIBCR3); + } + + return 1; +} + +static void set_pci_window(void __iomem *pcic, int no, u32 *memory) +{ + u32 word; + + word = memory[1] - 1; + pcic_writel(word, pcic, PCIC_PCILSR0 + no * 4); + word = P2SEGADDR(memory[0]); + pcic_writel(word, pcic, PCIC_PCILAR0 + no * 4); + pcic_writel(word, pcic, PCI_BASE_ADDRESS_1 + no * 4); +} + +static int sh7751_pci_probe(struct platform_device *pdev) +{ + struct resource *res, *bscres; + void __iomem *pcic; + void __iomem *bsc; + u32 memory[2]; + u16 vid, did; + u32 word; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + pcic = (void __iomem *)res->start; + + bscres = platform_get_resource(pdev, IORESOURCE_MEM, 1); + bsc = devm_ioremap_resource(&pdev->dev, bscres); + if (IS_ERR(bsc)) + return PTR_ERR(bsc); + + if (of_property_read_u32_array(pdev->dev.of_node, + "renesas,memory", memory, 2) < 0) { + /* + * If no memory range is specified, + * the entire main memory will be targeted for DMA. + */ + memory[0] = memory_start; + memory[1] = memory_end - memory_start; + } + + /* check for SH7751/SH7751R hardware */ + word = pcic_readl(pcic, PCI_VENDOR_ID); + vid = word & 0xffff; + did = word >> 16; + if ((vid != PCI_VENDOR_ID_HITACHI) || + ((did != PCI_DEVICE_ID_SH7751) && + (did != PCI_DEVICE_ID_SH7751R))) { + dev_warn(&pdev->dev, "PCI: This is not an SH7751(R)\n"); + return -ENODEV; + } + dev_info(&pdev->dev, "PCI core found at %pR\n", res); + + /* Set the BCR's to enable PCI access */ + word = __raw_readl(bsc + BSC_BCR1); + word |= BSC_BCR1_BRQEN; + __raw_writel(word, bsc + BSC_BCR1); + + /* Turn the clocks back on (not done in reset)*/ + pcic_writel(PCIC_WE_KEY | 0, pcic, PCIC_PCICLKR); + /* Clear Powerdown IRQ's (not done in reset) */ + word = PCIC_PCIPINT_D3 | PCIC_PCIPINT_D0; + pcic_writel(word, pcic, PCIC_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, pcic, PCI_COMMAND); + + /* define this host as the host bridge */ + word = PCI_BASE_CLASS_BRIDGE << 24; + pcic_writel(word, pcic, PCI_CLASS_REVISION); + + /* Set IO and Mem windows to local address + * Make PCI and local address the same for easy 1 to 1 mapping + */ + set_pci_window(pcic, 0, memory); + pcic_writel(0, pcic, PCIC_PCIIOBR); + + /* check BCR for SDRAM in specified area. And setup PCI BSC. */ + setup_pci_bsc(&pdev->dev, pcic, bsc, (memory[0] >> 26) & 0x07, + did == PCI_DEVICE_ID_SH7751R); + + /* configure the wait control registers */ + word = __raw_readl(bsc + BSC_WCR1); + pcic_writel(word, pcic, PCIC_PCIWCR1); + word = __raw_readl(bsc + BSC_WCR2); + pcic_writel(word, pcic, PCIC_PCIWCR2); + word = __raw_readl(bsc + BSC_WCR3); + pcic_writel(word, pcic, PCIC_PCIWCR3); + word = __raw_readl(bsc + BSC_MCR); + pcic_writel(word, pcic, PCIC_PCIMCR); + + /* Override register setting */ + pcic_fixups(pdev->dev.of_node, pcic, bsc); + + /* SH7751 init done, set central function init complete */ + /* use round robin mode to stop a device starving/overrunning */ + word = PCIC_PCICR_CFIN | PCIC_PCICR_ARBM; + pcic_writel(PCIC_WE_KEY | word, pcic, PCIC_PCICR); + + return pci_host_common_probe(pdev); +} + +/* + * Direct access to PCI hardware... + */ +#define CONFIG_CMD(bus, devfn, where) \ + (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3)) + +static void __iomem *sh4_pci_map_bus(struct pci_bus *bus, + unsigned int devfn, int where) +{ + struct pci_config_window *cfg = bus->sysdata; + void __iomem *pcic = (void __iomem *)cfg->res.start; + + pcic_writel(CONFIG_CMD(bus, devfn, where), pcic, PCIC_PCIPAR); + return pcic + PCIC_PCIPDR; +} + +static const struct pci_ecam_ops pci_sh7751_bus_ops = { + .pci_ops = { + .map_bus = sh4_pci_map_bus, + .read = pci_generic_config_read32, + .write = pci_generic_config_write32, + } +}; + +static const struct of_device_id sh7751_pci_of_match[] = { + { .compatible = "renesas,sh7751-pci", + .data = &pci_sh7751_bus_ops }, + { } +}; +MODULE_DEVICE_TABLE(of, sh7751_pci_of_match); + +static struct platform_driver sh7751_pci_driver = { + .driver = { + .name = "sh7751-pci", + .of_match_table = sh7751_pci_of_match, + }, + .probe = sh7751_pci_probe, +}; +module_platform_driver(sh7751_pci_driver); + +MODULE_DESCRIPTION("SH7751 PCI driver"); diff --git a/drivers/pci/controller/pci-sh7751.h b/drivers/pci/controller/pci-sh7751.h new file mode 100644 index 000000000000..540cee7095c6 --- /dev/null +++ b/drivers/pci/controller/pci-sh7751.h @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SH7751 PCI driver define + * Copyright (C) 2023 Yoshinori Sato + */ + +#ifndef _PCI_SH7751_H_ +#define _PCI_SH7751_H_ + +/* PCICR and PCICLKCR write enable magic key */ +#define PCIC_WE_KEY (0xa5 << 24) + +/* PCIC registers */ +/* 0x0000 - 0x00ff mapped to PCI device configuration space */ +#define PCIC_PCICR 0x100 /* PCI Control Register */ +#define PCIC_PCICR_TRSB BIT(9) /* Target Read Single */ +#define PCIC_PCICR_BSWP BIT(8) /* Target Byte Swap */ +#define PCIC_PCICR_PLUP BIT(7) /* Enable PCI Pullup */ +#define PCIC_PCICR_ARBM BIT(6) /* PCI Arbitration Mode */ +#define PCIC_PCICR_MD10 BIT(5) /* MD10 status */ +#define PCIC_PCICR_MD9 BIT(4) /* MD9 status */ +#define PCIC_PCICR_SERR BIT(3) /* SERR output assert */ +#define PCIC_PCICR_INTA BIT(2) /* INTA output assert */ +#define PCIC_PCICR_PRST BIT(1) /* PCI Reset Assert */ +#define PCIC_PCICR_CFIN BIT(0) /* Central Fun. Init Done */ + +#define PCIC_PCILSR0 0x104 /* PCI Local Space Register0 */ +#define PCIC_PCILSR1 0x108 /* PCI Local Space Register1 */ +#define PCIC_PCILAR0 0x10c /* PCI Local Addr Register1 */ +#define PCIC_PCILAR1 0x110 /* PCI Local Addr Register1 */ +#define PCIC_PCIINT 0x114 /* PCI Interrupt Register */ +#define PCIC_PCIINTM 0x118 /* PCI Interrupt Mask */ +#define PCIC_PCIALR 0x11c /* Error Address Register */ +#define PCIC_PCICLR 0x120 /* Error Command/Data */ +#define PCIC_PCIAINT 0x130 /* Arbiter Interrupt Register */ +#define PCIC_PCIAINTM 0x134 /* Arbiter Int. Mask Register */ +#define PCIC_PCIBMLR 0x138 /* Error Bus Master Register */ +#define PCIC_PCIDMABT 0x140 /* DMA Transfer Arb. Register */ +#define PCIC_PCIPAR 0x1c0 /* PIO Address Register */ +#define PCIC_PCIMBR 0x1c4 /* Memory Base Address */ +#define PCIC_PCIIOBR 0x1c8 /* I/O Base Address Register */ + +#define PCIC_PCIPINT 0x1cc /* Power Mgmnt Int. Register */ +#define PCIC_PCIPINT_D3 BIT(1) /* D3 Pwr Mgmt. Interrupt */ +#define PCIC_PCIPINT_D0 BIT(0) /* D0 Pwr Mgmt. Interrupt */ + +#define PCIC_PCIPINTM 0x1d0 /* Power Mgmnt Mask Register */ +#define PCIC_PCICLKR 0x1d4 /* Clock Ctrl. Register */ +#define PCIC_PCIBCR1 0x1e0 /* Memory BCR1 Register */ +#define PCIC_PCIBCR2 0x1e4 /* Memory BCR2 Register */ +#define PCIC_PCIWCR1 0x1e8 /* Wait Control 1 Register */ +#define PCIC_PCIWCR2 0x1ec /* Wait Control 2 Register */ +#define PCIC_PCIWCR3 0x1f0 /* Wait Control 3 Register */ +#define PCIC_PCIMCR 0x1f4 /* Memory Control Register */ +#define PCIC_PCIBCR3 0x1f8 /* Memory BCR3 Register */ +#define PCIC_PCIPDR 0x220 /* Port IO Data Register */ + +/* PCI IDs */ +/* Hitachi is the company that led to Renesas. */ +/* The SH7751 was designed by Hitachi, so it has a Hitachi ID. */ +#define PCI_VENDOR_ID_HITACHI 0x1054 +#define PCI_DEVICE_ID_SH7751 0x3505 +#define PCI_DEVICE_ID_SH7751R 0x350e + +/* BSC registers */ +/* Copy BSC setting to PCI BSC */ +#define BSC_BCR1 0x0000 +#define BSC_BCR1_BRQEN BIT(19) +#define BSC_BCR2 0x0004 +#define BSC_BCR3 0x0050 +#define BSC_WCR1 0x0008 +#define BSC_WCR2 0x000c +#define BSC_WCR3 0x0010 +#define BSC_MCR 0x0014 + +#endif /* _PCI_SH7751_H_ */