[PATCHv9 1/3] mfd: altera: Add Altera SDRAM Controller
From: tthayer
Date: Wed Jul 30 2014 - 14:17:16 EST
From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
Add a simple MFD for the Altera SDRAM Controller.
Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
---
v1-8: The MFD implementation was not included in the original series.
v9: New MFD implementation.
---
MAINTAINERS | 5 ++
drivers/mfd/Kconfig | 7 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/altera-sdr.c | 162 ++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/altera-sdr.h | 102 +++++++++++++++++++++++++
5 files changed, 277 insertions(+)
create mode 100644 drivers/mfd/altera-sdr.c
create mode 100644 include/linux/mfd/altera-sdr.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 86efa7e..48a8923 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1340,6 +1340,11 @@ M: Dinh Nguyen <dinguyen@xxxxxxxxxx>
S: Maintained
F: drivers/clk/socfpga/
+ARM/SOCFPGA SDRAM CONTROLLER SUPPORT
+M: Thor Thayer <tthayer@xxxxxxxxxx>
+S: Maintained
+F: drivers/mfd/altera-sdr.c
+
ARM/STI ARCHITECTURE
M: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxx>
M: Maxime Coquelin <maxime.coquelin@xxxxxx>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6cc4b6a..8ce4961 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -719,6 +719,13 @@ config MFD_STMPE
Keypad: stmpe-keypad
Touchscreen: stmpe-ts
+config MFD_ALTERA_SDR
+ bool "Altera SDRAM Controller MFD"
+ depends on ARCH_SOCFPGA
+ select MFD_CORE
+ help
+ Support for Altera SDRAM Controller (SDR) MFD.
+
menu "STMicroelectronics STMPE Interface Drivers"
depends on MFD_STMPE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8afedba..24cc2b7 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -169,3 +169,4 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
+obj-$(CONFIG_MFD_ALTERA_SDR) += altera-sdr.o
diff --git a/drivers/mfd/altera-sdr.c b/drivers/mfd/altera-sdr.c
new file mode 100644
index 0000000..b5c6646
--- /dev/null
+++ b/drivers/mfd/altera-sdr.c
@@ -0,0 +1,162 @@
+/*
+ * SDRAM Controller (SDR) MFD
+ *
+ * Copyright (C) 2014 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/altera-sdr.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static const struct mfd_cell altera_sdr_devs[] = {
+#if defined(CONFIG_EDAC_ALTERA_MC)
+ {
+ .name = "altr_sdram_edac",
+ .of_compatible = "altr,sdram-edac",
+ },
+#endif
+};
+
+u32 altera_sdr_readl(struct altera_sdr *sdr, u32 reg_offset)
+{
+ return readl(sdr->reg_base + reg_offset);
+}
+EXPORT_SYMBOL_GPL(altera_sdr_readl);
+
+void altera_sdr_writel(struct altera_sdr *sdr, u32 reg_offset, u32 value)
+{
+ writel(value, sdr->reg_base + reg_offset);
+}
+EXPORT_SYMBOL_GPL(altera_sdr_writel);
+
+/* Get total memory size in bytes */
+u32 altera_sdr_mem_size(struct altera_sdr *sdr)
+{
+ u32 size;
+ u32 read_reg, row, bank, col, cs, width;
+
+ read_reg = altera_sdr_readl(sdr, SDR_DRAMADDRW_OFST);
+ if (read_reg < 0)
+ return 0;
+
+ width = altera_sdr_readl(sdr, SDR_DRAMIFWIDTH_OFST);
+ if (width < 0)
+ return 0;
+
+ col = (read_reg & SDR_DRAMADDRW_COLBITS_MASK) >>
+ SDR_DRAMADDRW_COLBITS_LSB;
+ row = (read_reg & SDR_DRAMADDRW_ROWBITS_MASK) >>
+ SDR_DRAMADDRW_ROWBITS_LSB;
+ bank = (read_reg & SDR_DRAMADDRW_BANKBITS_MASK) >>
+ SDR_DRAMADDRW_BANKBITS_LSB;
+ cs = (read_reg & SDR_DRAMADDRW_CSBITS_MASK) >>
+ SDR_DRAMADDRW_CSBITS_LSB;
+
+ /* Correct for ECC as its not addressible */
+ if (width == SDR_DRAMIFWIDTH_32B_ECC)
+ width = 32;
+ if (width == SDR_DRAMIFWIDTH_16B_ECC)
+ width = 16;
+
+ /* calculate the SDRAM size base on this info */
+ size = 1 << (row + bank + col);
+ size = size * cs * (width / 8);
+ return size;
+}
+EXPORT_SYMBOL_GPL(altera_sdr_mem_size);
+
+static int altera_sdr_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct altera_sdr *sdr;
+ struct resource *res;
+ void __iomem *base;
+ int ret;
+
+ sdr = devm_kzalloc(dev, sizeof(*sdr), GFP_KERNEL);
+ if (!sdr)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
+
+ base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!base)
+ return -ENOMEM;
+
+ sdr->dev = &pdev->dev;
+ sdr->reg_base = base;
+
+ ret = mfd_add_devices(sdr->dev, 0, altera_sdr_devs,
+ ARRAY_SIZE(altera_sdr_devs), NULL, 0, NULL);
+ if (ret)
+ dev_err(sdr->dev, "error adding devices");
+
+ platform_set_drvdata(pdev, sdr);
+
+ dev_dbg(dev, "Altera SDR MFD registered\n");
+
+ return 0;
+}
+
+static int altera_sdr_remove(struct platform_device *pdev)
+{
+ struct altera_sdr *sdr = platform_get_drvdata(pdev);
+
+ mfd_remove_devices(sdr->dev);
+
+ return 0;
+}
+
+static const struct of_device_id of_altera_sdr_match[] = {
+ { .compatible = "altr,sdr", },
+ { },
+};
+
+static const struct platform_device_id altera_sdr_ids[] = {
+ { "altera_sdr", },
+ { }
+};
+
+static struct platform_driver altera_sdr_driver = {
+ .driver = {
+ .name = "altera_sdr",
+ .owner = THIS_MODULE,
+ .of_match_table = of_altera_sdr_match,
+ },
+ .probe = altera_sdr_probe,
+ .remove = altera_sdr_remove,
+ .id_table = altera_sdr_ids,
+};
+
+static int __init altera_sdr_init(void)
+{
+ return platform_driver_register(&altera_sdr_driver);
+}
+postcore_initcall(altera_sdr_init);
+
+static void __exit altera_sdr_exit(void)
+{
+ platform_driver_unregister(&altera_sdr_driver);
+}
+module_exit(altera_sdr_exit);
+
+MODULE_AUTHOR("Alan Tull <atull@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Altera SDRAM Controller (SDR) MFD");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/altera-sdr.h b/include/linux/mfd/altera-sdr.h
new file mode 100644
index 0000000..a5f5c39
--- /dev/null
+++ b/include/linux/mfd/altera-sdr.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2014 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __LINUX_MFD_ALTERA_SDR_H
+#define __LINUX_MFD_ALTERA_SDR_H
+
+/* SDRAM Controller register offsets */
+#define SDR_CTLCFG_OFST 0x00
+#define SDR_DRAMADDRW_OFST 0x2C
+#define SDR_DRAMIFWIDTH_OFST 0x30
+#define SDR_DRAMSTS_OFST 0x38
+#define SDR_DRAMINTR_OFST 0x3C
+#define SDR_SBECOUNT_OFST 0x40
+#define SDR_DBECOUNT_OFST 0x44
+#define SDR_ERRADDR_OFST 0x48
+#define SDR_DROPCOUNT_OFST 0x4C
+#define SDR_DROPADDR_OFST 0x50
+#define SDR_CTRLGRP_LOWPWREQ_OFST 0x54
+#define SDR_CTRLGRP_LOWPWRACK_OFST 0x58
+
+/* SDRAM Controller CtrlCfg Register Bit Masks */
+#define SDR_CTLCFG_ECC_EN 0x400
+#define SDR_CTLCFG_ECC_CORR_EN 0x800
+#define SDR_CTLCFG_GEN_SB_ERR 0x2000
+#define SDR_CTLCFG_GEN_DB_ERR 0x4000
+
+#define SDR_CTLCFG_ECC_AUTO_EN (SDR_CTLCFG_ECC_EN | \
+ SDR_CTLCFG_ECC_CORR_EN)
+
+/* SDRAM Controller Address Widths Field Register */
+#define SDR_DRAMADDRW_COLBITS_MASK 0x001F
+#define SDR_DRAMADDRW_COLBITS_LSB 0
+#define SDR_DRAMADDRW_ROWBITS_MASK 0x03E0
+#define SDR_DRAMADDRW_ROWBITS_LSB 5
+#define SDR_DRAMADDRW_BANKBITS_MASK 0x1C00
+#define SDR_DRAMADDRW_BANKBITS_LSB 10
+#define SDR_DRAMADDRW_CSBITS_MASK 0xE000
+#define SDR_DRAMADDRW_CSBITS_LSB 13
+
+/* SDRAM Controller Interface Data Width Defines */
+#define SDR_DRAMIFWIDTH_16B_ECC 24
+#define SDR_DRAMIFWIDTH_32B_ECC 40
+
+/* SDRAM Controller DRAM Status Register Bit Masks */
+#define SDR_DRAMSTS_SBEERR 0x04
+#define SDR_DRAMSTS_DBEERR 0x08
+#define SDR_DRAMSTS_CORR_DROP 0x10
+
+/* SDRAM Controller DRAM IRQ Register Bit Masks */
+#define SDR_DRAMINTR_INTREN 0x01
+#define SDR_DRAMINTR_SBEMASK 0x02
+#define SDR_DRAMINTR_DBEMASK 0x04
+#define SDR_DRAMINTR_CORRDROPMASK 0x08
+#define SDR_DRAMINTR_INTRCLR 0x10
+
+/* SDRAM Controller Single Bit Error Count Register Bit Masks */
+#define SDR_SBECOUNT_COUNT_MASK 0x0F
+
+/* SDRAM Controller Double Bit Error Count Register Bit Masks */
+#define SDR_DBECOUNT_COUNT_MASK 0x0F
+
+/* SDRAM Controller ECC Error Address Register Bit Masks */
+#define SDR_ERRADDR_ADDR_MASK 0xFFFFFFFF
+
+/* SDRAM Controller ECC Autocorrect Drop Count Register Bit Masks */
+#define SDR_DROPCOUNT_CORRMASK 0x0F
+
+/* SDRAM Controller ECC AutoCorrect Error Address Register Bit Masks */
+#define SDR_DROPADDR_ADDR_MASK 0xFFFFFFFF
+
+#define SELFRSHREQ_POS 3
+#define SELFRSHREQ_MASK 0x8
+
+#define SELFRFSHMASK_POS 4
+#define SELFRFSHMASK_MASK 0x30
+
+#define SELFRFSHACK_POS 1
+#define SELFRFSHACK_MASK 0x2
+
+struct altera_sdr {
+ struct device *dev;
+ void __iomem *reg_base;
+};
+
+/* Register access API */
+u32 altera_sdr_readl(struct altera_sdr *sdr, u32 reg_offset);
+void altera_sdr_writel(struct altera_sdr *sdr, u32 reg_offset, u32 value);
+u32 altera_sdr_mem_size(struct altera_sdr *sdr);
+
+#endif /* __LINUX_MFD_ALTERA_SDR_H */
--
1.7.9.5
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