Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425Ab3I0CDG (ORCPT ); Thu, 26 Sep 2013 22:03:06 -0400 Received: from denmail01-v4020.amcc.com ([192.195.68.30]:58471 "EHLO denmail01.apm.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1750843Ab3I0CDE (ORCPT ); Thu, 26 Sep 2013 22:03:04 -0400 X-Greylist: delayed 2574 seconds by postgrey-1.27 at vger.kernel.org; Thu, 26 Sep 2013 22:03:04 EDT From: Feng Kan To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Feng Kan Subject: [PATCH 1/1] arm64: X-Gene AHBC platform bus driver Date: Thu, 26 Sep 2013 18:19:21 -0700 Message-Id: <1380244761-15143-1-git-send-email-fkan@apm.com> X-Mailer: git-send-email 1.7.6.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7606 Lines: 264 This driver setup the AHBC for SPI and SD drivers to use. Signed-off-by: Feng Kan --- arch/arm64/boot/dts/apm-storm.dtsi | 6 + drivers/bus/Kconfig | 9 ++ drivers/bus/Makefile | 2 + drivers/bus/xgene_ahbc.c | 193 ++++++++++++++++++++++++++++++++++++ 4 files changed, 210 insertions(+), 0 deletions(-) create mode 100644 drivers/bus/xgene_ahbc.c diff --git a/arch/arm64/boot/dts/apm-storm.dtsi b/arch/arm64/boot/dts/apm-storm.dtsi index d994806..b9477ec 100644 --- a/arch/arm64/boot/dts/apm-storm.dtsi +++ b/arch/arm64/boot/dts/apm-storm.dtsi @@ -178,6 +178,12 @@ }; }; + ahbc: ahbc@1f2a0000 { + device_type = "ahbc"; + compatible = "apm,xgene-ahbc"; + reg = <0x0 0x1f2a0000 0x0 0x80000>; + }; + serial0: serial@1c020000 { device_type = "serial"; compatible = "ns16550"; diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index 1f70e84..6cc361c68 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -42,4 +42,13 @@ config ARM_CCI help Driver supporting the CCI cache coherent interconnect for ARM platforms. + +config XGENE_AHBC + tristate "X-Gene SoC AHB Bus Driver" + depends on ARM64 && ARCH_XGENE + default y if ARCH_XGENE + help + X-Gene SoC AHB bus driver is required for SPI and + SDIO to function properly. + endmenu diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 8947bdd..0c7a4ca 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -10,3 +10,5 @@ obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o # CCI cache coherent interconnect for ARM platforms obj-$(CONFIG_ARM_CCI) += arm-cci.o + +obj-$(CONFIG_XGENE_AHBC) += xgene_ahbc.o diff --git a/drivers/bus/xgene_ahbc.c b/drivers/bus/xgene_ahbc.c new file mode 100644 index 0000000..9554bb4 --- /dev/null +++ b/drivers/bus/xgene_ahbc.c @@ -0,0 +1,193 @@ +/** + * AppliedMicro X-Gene AHBC Driver + * + * Copyright (c) 2013, Applied Micro Circuits Corporation + * Author: Loc Ho + * Author: Feng Kan + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + */ +#include +#include +#include +#include +#include +#include +#include + +#define AHBC_DRIVER_VER "0.1" + +#define AIM_8_SIZE_CTL_ADDR 0x00000104 +#define AIM_8_AXI_LO_ADDR 0x00000108 +#define AIM_8_AXI_HI_ADDR 0x0000010c + +#define ARSB_F8_WR(src) (((u32)(src)<<23) & 0x03800000) +#define AWSB_F8_WR(src) (((u32)(src)<<20) & 0x00700000) +#define AIM_AXI_ADDRESS_LO_8_WR(src) (((u32)(src)) & 0x000fffff) + +/* Global Base Address */ +#define REGSPEC_AHBC_GLBL_DIAG_CSR_I_BASE_ADDR 0x01f2ad000ULL + +#define REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR 0x00000070 +#define REGSPEC_BLOCK_MEM_RDY_ADDR 0x00000074 + +static void xgene_ahb_write(void *base, u32 offset, u32 val) +{ + if (base == NULL) + return; + + writel_relaxed(val, base + offset); +} + +static void xgene_ahbc_init_mem(struct platform_device *pdev) +{ + void *ahbc_base = platform_get_drvdata(pdev); + u32 diag_offset = REGSPEC_AHBC_GLBL_DIAG_CSR_I_BASE_ADDR & 0xFFFF; + void *diagcsr_base = ahbc_base + diag_offset; + int timeout; + u32 val; + + if (ahbc_base == NULL) + return; + + if (readl(diagcsr_base + REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR) == 0) + return; + + dev_dbg(&pdev->dev, "AHBC clear memory shutdown\n"); + writel(0x00, diagcsr_base + REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR); + readl(diagcsr_base + REGSPEC_CFG_MEM_RAM_SHUTDOWN_ADDR); + + val = readl(diagcsr_base + REGSPEC_BLOCK_MEM_RDY_ADDR); + timeout = 5000; + while (val != 0xFFFFFFFF && timeout-- > 0) { + val = readl(diagcsr_base + REGSPEC_BLOCK_MEM_RDY_ADDR); + if (val != 0xFFFFFFFF) + udelay(1); + } + if (timeout <= 0) + dev_err(&pdev->dev, "AHBC failed to remove RAM out of reset\n"); +} + +static int xgene_ahbc_hw_init(struct platform_device *pdev) +{ + void *ahbc_base = platform_get_drvdata(pdev); + phys_addr_t ddr_phy; + + /** + * Set AHBC AIM windows for 4GB regardless of DDR size. This + * must map to Kernel memory space. + */ + ddr_phy = memblock_phys_mem_size(); + dev_dbg(&pdev->dev, "Setup AHBC AIM windows DDR 0x%llX\n", ddr_phy); + xgene_ahb_write(ahbc_base, AIM_8_SIZE_CTL_ADDR, 0x00000000); + xgene_ahb_write(ahbc_base, AIM_8_AXI_LO_ADDR, + ARSB_F8_WR(1) | AWSB_F8_WR(1) | + AIM_AXI_ADDRESS_LO_8_WR((u32) ddr_phy)); + xgene_ahb_write(ahbc_base, AIM_8_AXI_HI_ADDR, + (u32) ((ddr_phy >> 32) << 20)); + + return 0; +} + +static int __init xgene_ahbc_probe(struct platform_device *pdev) +{ + struct resource res; + int rc; + void *reg; + + rc = of_address_to_resource(pdev->dev.of_node, 0, &res); + if (rc != 0) { + dev_err(&pdev->dev, "invalid resource address\n"); + return -ENODEV; + } + reg = ioremap(res.start, res.end - res.start + 1); + if (reg == NULL) { + dev_err(&pdev->dev, "can not map resource\n"); + return -ENODEV; + } + + platform_set_drvdata(pdev, reg); + + /* Initialize the hardware */ + xgene_ahbc_init_mem(pdev); + xgene_ahbc_hw_init(pdev); + + dev_info(&pdev->dev, "AHBC driver v%s\n", AHBC_DRIVER_VER); + return 0; +} + +static int xgene_ahbc_remove(struct platform_device *pdev) +{ + void *ahbc_base = platform_get_drvdata(pdev); + + iounmap(ahbc_base); + platform_set_drvdata(pdev, NULL); + return 0; +} + +#if defined(CONFIG_PM) +static int xgene_ahbc_suspend(struct platform_device *dev, pm_message_t state) +{ + /* Nothing to do here */ + return 0; +} + +static int xgene_ahbc_resume(struct platform_device *pdev) +{ + /* Initialize the hardware */ + xgene_ahbc_init_mem(pdev); + xgene_ahbc_hw_init(pdev); + return 0; +} +#endif + +static const struct of_device_id xgene_ahbc_match[] = { + {.compatible = "apm,xgene-ahbc",}, + {}, +}; + +MODULE_DEVICE_TABLE(of, xgene_ahbc_match); + +static struct platform_driver ahbc_driver = { + .probe = xgene_ahbc_probe, + .remove = xgene_ahbc_remove, +#if defined(CONFIG_PM) + .suspend = xgene_ahbc_suspend, + .resume = xgene_ahbc_resume, +#endif + .driver = { + .name = "xgene-ahbc", + .owner = THIS_MODULE, + .of_match_table = xgene_ahbc_match, + }, +}; + +static int __init xgene_ahbc_init(void) +{ + return platform_driver_register(&ahbc_driver); +} +subsys_initcall(xgene_ahbc_init); + +static void __exit xgene_ahbc_exit(void) +{ + platform_driver_unregister(&ahbc_driver); +} +module_exit(xgene_ahbc_exit); + +MODULE_AUTHOR("Loc Ho "); +MODULE_DESCRIPTION("X-Gene AHBC driver"); +MODULE_LICENSE("GPL"); -- 1.7.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/