[PATCH 07/12] memory: davinci-aemif: introduce AEMIF driver

Khoronzhuk, Ivan ivan.khoronzhuk at ti.com
Mon Nov 11 12:06:59 EST 2013


Add new AEMIF driver for EMIF16 davinci controller. The EMIF16 module
is intended to provide a glue-less interface to a variety of
asynchronous memory devices like ASRA M, NOR and NAND memory. A total
of 256M bytes of any of these memories can be accessed at any given
time via four chip selects with 64M byte access per chip select.

Synchronous memories such as DDR1 SD RAM, SDR SDRAM and Mobile SDR
are not supported.

See http://www.ti.com/lit/ug/sprugz3a/sprugz3a.pdf

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk at ti.com>
---
 drivers/memory/Kconfig         |   11 ++
 drivers/memory/Makefile        |    1 +
 drivers/memory/davinci-aemif.c |  415 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 427 insertions(+)
 create mode 100644 drivers/memory/davinci-aemif.c

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index 29a11db..010e75e 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -7,6 +7,17 @@ menuconfig MEMORY

 if MEMORY

+config TI_DAVINCI_AEMIF
+       bool "Texas Instruments DaVinci AEMIF driver"
+       depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF
+       help
+         This driver is for the AEMIF module available in Texas Instruments
+         SoCs. AEMIF stands for Asynchronous External Memory Interface and
+         is intended to provide a glue-less interface to a variety of
+         asynchronuous memory devices like ASRAM, NOR and NAND memory. A total
+         of 256M bytes of any of these memories can be accessed at a given
+         time via four chip selects with 64M byte access per chip select.
+
 config TI_EMIF
        tristate "Texas Instruments EMIF driver"
        depends on ARCH_OMAP2PLUS
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index 969d923..af14126 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -5,6 +5,7 @@
 ifeq ($(CONFIG_DDR),y)
 obj-$(CONFIG_OF)               += of_memory.o
 endif
+obj-$(CONFIG_TI_DAVINCI_AEMIF) += davinci-aemif.o
 obj-$(CONFIG_TI_EMIF)          += emif.o
 obj-$(CONFIG_MVEBU_DEVBUS)     += mvebu-devbus.o
 obj-$(CONFIG_TEGRA20_MC)       += tegra20-mc.o
diff --git a/drivers/memory/davinci-aemif.c b/drivers/memory/davinci-aemif.c
new file mode 100644
index 0000000..e36b74b
--- /dev/null
+++ b/drivers/memory/davinci-aemif.c
@@ -0,0 +1,415 @@
+/*
+ * DaVinci/Keystone AEMIF driver
+ *
+ * Copyright (C) 2010 - 2013 Texas Instruments Incorporated. http://www.ti.com/
+ * Copyright (C) Heiko Schocher <hs at denx.de>
+ * Copyright (C) Ivan Khoronzhuk <ivan.khoronzhuk at ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#define TA_SHIFT       2
+#define RHOLD_SHIFT    4
+#define RSTROBE_SHIFT  7
+#define RSETUP_SHIFT   13
+#define WHOLD_SHIFT    17
+#define WSTROBE_SHIFT  20
+#define WSETUP_SHIFT   26
+#define EW_SHIFT       30
+#define SS_SHIFT       31
+
+#define TA(x)          ((x) << TA_SHIFT)
+#define RHOLD(x)       ((x) << RHOLD_SHIFT)
+#define RSTROBE(x)     ((x) << RSTROBE_SHIFT)
+#define RSETUP(x)      ((x) << RSETUP_SHIFT)
+#define WHOLD(x)       ((x) << WHOLD_SHIFT)
+#define WSTROBE(x)     ((x) << WSTROBE_SHIFT)
+#define WSETUP(x)      ((x) << WSETUP_SHIFT)
+#define EW(x)          ((x) << EW_SHIFT)
+#define SS(x)          ((x) << SS_SHIFT)
+
+#define ASIZE_MAX      0x1
+#define TA_MAX         0x3
+#define RHOLD_MAX      0x7
+#define RSTROBE_MAX    0x3f
+#define RSETUP_MAX     0xf
+#define WHOLD_MAX      0x7
+#define WSTROBE_MAX    0x3f
+#define WSETUP_MAX     0xf
+#define EW_MAX         0x1
+#define SS_MAX         0x1
+#define NUM_CS         4
+
+#define TA_VAL(x)      (((x) & TA(TA_MAX)) >> TA_SHIFT)
+#define RHOLD_VAL(x)   (((x) & RHOLD(RHOLD_MAX)) >> RHOLD_SHIFT)
+#define RSTROBE_VAL(x) (((x) & RSTROBE(RSTROBE_MAX)) >> RSTROBE_SHIFT)
+#define RSETUP_VAL(x)  (((x) & RSETUP(RSETUP_MAX)) >> RSETUP_SHIFT)
+#define WHOLD_VAL(x)   (((x) & WHOLD(WHOLD_MAX)) >> WHOLD_SHIFT)
+#define WSTROBE_VAL(x) (((x) & WSTROBE(WSTROBE_MAX)) >> WSTROBE_SHIFT)
+#define WSETUP_VAL(x)  (((x) & WSETUP(WSETUP_MAX)) >> WSETUP_SHIFT)
+#define EW_VAL(x)      (((x) & EW(EW_MAX)) >> EW_SHIFT)
+#define SS_VAL(x)      (((x) & SS(SS_MAX)) >> SS_SHIFT)
+
+#define NRCSR_OFFSET   0x00
+#define AWCCR_OFFSET   0x04
+#define A1CR_OFFSET    0x10
+
+#define ACR_ASIZE_MASK 0x3
+#define ACR_EW_MASK    BIT(30)
+#define ACR_SS_MASK    BIT(31)
+#define ASIZE_16BIT    1
+
+#define CONFIG_MASK    (TA(TA_MAX) | \
+                               RHOLD(RHOLD_MAX) | \
+                               RSTROBE(RSTROBE_MAX) |  \
+                               RSETUP(RSETUP_MAX) | \
+                               WHOLD(WHOLD_MAX) | \
+                               WSTROBE(WSTROBE_MAX) | \
+                               WSETUP(WSETUP_MAX) | \
+                               EW(EW_MAX) | SS(SS_MAX) | \
+                               ASIZE_MAX)
+
+#define DRV_NAME       "davinci-aemif"
+
+/**
+ * structure to hold cs parameters
+ * @cs: chip-select number
+ * @wstrobe: write strobe width, ns
+ * @rstrobe: read strobe width, ns
+ * @wsetup: write setup width, ns
+ * @whold: write hold width, ns
+ * @rsetup: read setup width, ns
+ * @rhold: read hold width, ns
+ * @ta: minimum turn around time, ns
+ * @enable_ss: enable/disable select strobe mode
+ * @enable_ew: enable/disable extended wait mode
+ * @asize: width of the asynchronous device's data bus
+ */
+struct davinci_aemif_cs_data {
+       u8      cs;
+       u16     wstrobe;
+       u16     rstrobe;
+       u8      wsetup;
+       u8      whold;
+       u8      rsetup;
+       u8      rhold;
+       u8      ta;
+       u8      enable_ss;
+       u8      enable_ew;
+       u8      asize;
+};
+
+/**
+ * structure to hold device data
+ * @base: base address of AEMIF registers
+ * @clk: source clock
+ * @clk_rate: clock's rate in kHz
+ * @num_cs: number of assigned chip-selects
+ * @cs_data: array of chip-select settings
+ */
+struct davinci_aemif_device {
+       struct device *dev;
+       void __iomem *base;
+       struct clk *clk;
+       unsigned long clk_rate;
+       u8 num_cs;
+       int cs_offset;
+       struct davinci_aemif_cs_data cs_data[NUM_CS];
+};
+
+static struct davinci_aemif_device *aemif;
+/**
+ * davinci_aemif_calc_rate - calculate timing data.
+ * @wanted: The cycle time needed in nanoseconds.
+ * @clk: The input clock rate in kHz.
+ * @max: The maximum divider value that can be programmed.
+ *
+ * On success, returns the calculated timing value minus 1 for easy
+ * programming into AEMIF timing registers, else negative errno.
+ */
+static int davinci_aemif_calc_rate(int wanted, unsigned long clk, int max)
+{
+       int result;
+
+       result = DIV_ROUND_UP((wanted * clk), NSEC_PER_MSEC) - 1;
+
+       dev_dbg(aemif->dev, "%s: result %d from %ld, %d\n", __func__, result,
+               clk, wanted);
+
+       /* It is generally OK to have a more relaxed timing than requested... */
+       if (result < 0)
+               result = 0;
+
+       /* ... But configuring tighter timings is not an option. */
+       else if (result > max)
+               result = -EINVAL;
+
+       return result;
+}
+
+/**
+ * davinci_aemif_config_abus - configure async bus parameters
+ * @data: aemif chip select configuration
+ *
+ * This function programs the given timing values (in real clock) into the
+ * AEMIF registers taking the AEMIF clock into account.
+ *
+ * This function does not use any locking while programming the AEMIF
+ * because it is expected that there is only one user of a given
+ * chip-select.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+static int davinci_aemif_config_abus(struct davinci_aemif_cs_data *data)
+{
+       int ta, rhold, rstrobe, rsetup, whold, wstrobe, wsetup;
+       unsigned offset;
+       u32 set, val;
+
+       offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;
+
+       ta      = davinci_aemif_calc_rate(data->ta, aemif->clk_rate, TA_MAX);
+       rhold   = davinci_aemif_calc_rate(data->rhold, aemif->clk_rate,
+                                         RHOLD_MAX);
+       rstrobe = davinci_aemif_calc_rate(data->rstrobe, aemif->clk_rate,
+                                         RSTROBE_MAX);
+       rsetup  = davinci_aemif_calc_rate(data->rsetup, aemif->clk_rate,
+                                         RSETUP_MAX);
+       whold   = davinci_aemif_calc_rate(data->whold, aemif->clk_rate,
+                                         WHOLD_MAX);
+       wstrobe = davinci_aemif_calc_rate(data->wstrobe, aemif->clk_rate,
+                                         WSTROBE_MAX);
+       wsetup  = davinci_aemif_calc_rate(data->wsetup, aemif->clk_rate,
+                                         WSETUP_MAX);
+
+       if (ta < 0 || rhold < 0 || rstrobe < 0 || rsetup < 0 ||
+                       whold < 0 || wstrobe < 0 || wsetup < 0) {
+               dev_err(aemif->dev, "%s: cannot get suitable timings\n",
+                       __func__);
+               return -EINVAL;
+       }
+
+       set = TA(ta) | RHOLD(rhold) | RSTROBE(rstrobe) | RSETUP(rsetup) |
+               WHOLD(whold) | WSTROBE(wstrobe) | WSETUP(wsetup);
+
+       set |= (data->asize & ACR_ASIZE_MASK);
+       if (data->enable_ew)
+               set |= ACR_EW_MASK;
+       if (data->enable_ss)
+               set |= ACR_SS_MASK;
+
+       val = readl(aemif->base + offset);
+       val &= ~CONFIG_MASK;
+       val |= set;
+       writel(val, aemif->base + offset);
+
+       return 0;
+}
+
+inline int davinci_aemif_cycles_to_nsec(int val)
+{
+       return ((val + 1) * NSEC_PER_MSEC) / aemif->clk_rate;
+}
+
+/**
+ * davinci_aemif_get_hw_params - function to read hw register values
+ * @data: ptr to cs data
+ *
+ * This function reads the defaults from the registers and update
+ * the timing values. Required for get/set commands and also for
+ * the case when driver needs to use defaults in hardware.
+ */
+static void davinci_aemif_get_hw_params(struct davinci_aemif_cs_data *data)
+{
+       u32 val, offset;
+       offset = A1CR_OFFSET + (data->cs - aemif->cs_offset) * 4;
+
+       val = readl(aemif->base + offset);
+       data->ta = davinci_aemif_cycles_to_nsec(TA_VAL(val));
+       data->rhold = davinci_aemif_cycles_to_nsec(RHOLD_VAL(val));
+       data->rstrobe = davinci_aemif_cycles_to_nsec(RSTROBE_VAL(val));
+       data->rsetup = davinci_aemif_cycles_to_nsec(RSETUP_VAL(val));
+       data->whold = davinci_aemif_cycles_to_nsec(WHOLD_VAL(val));
+       data->wstrobe = davinci_aemif_cycles_to_nsec(WSTROBE_VAL(val));
+       data->wsetup = davinci_aemif_cycles_to_nsec(WSETUP_VAL(val));
+       data->enable_ew = EW_VAL(val);
+       data->enable_ss = SS_VAL(val);
+       data->asize = val & ASIZE_MAX;
+}
+
+/**
+ * of_davinci_aemif_parse_abus_config - parse CS configuration from DT
+ * @np: device node ptr
+ *
+ * This function update the emif async bus configuration based on the values
+ * configured in a cs device binding node.
+ */
+static int of_davinci_aemif_parse_abus_config(struct device_node *np)
+{
+       struct davinci_aemif_cs_data *data;
+       unsigned long cs;
+       u32 val;
+
+       if (kstrtoul(np->name + 2, 10, &cs) < 0) {
+               dev_dbg(aemif->dev, "cs name is incorrect");
+               return -EINVAL;
+       }
+
+       if (cs - aemif->cs_offset >= NUM_CS || cs < aemif->cs_offset) {
+               dev_dbg(aemif->dev, "cs number is incorrect %lu", cs);
+               return -EINVAL;
+       }
+
+       if (aemif->num_cs >= NUM_CS) {
+               dev_dbg(aemif->dev, "cs count is more than %d", NUM_CS);
+               return -EINVAL;
+       }
+
+       data = &aemif->cs_data[aemif->num_cs++];
+       data->cs = cs;
+
+       /* read the current value in the hw register */
+       davinci_aemif_get_hw_params(data);
+
+       /* override the values from device node */
+       of_property_read_u8(np, "ti,davinci-cs-ta", &data->ta);
+       of_property_read_u8(np, "ti,davinci-cs-rhold", &data->rhold);
+       of_property_read_u16(np, "ti,davinci-cs-rstrobe", &data->rstrobe);
+       of_property_read_u8(np, "ti,davinci-cs-rsetup", &data->rsetup);
+       of_property_read_u8(np, "ti,davinci-cs-whold", &data->whold);
+       of_property_read_u16(np, "ti,davinci-cs-wstrobe", &data->wstrobe);
+       of_property_read_u8(np, "ti,davinci-cs-wsetup", &data->wsetup);
+       if (!of_property_read_u32(np, "ti,bus-width", &val))
+               if (val == 16)
+                       data->asize = 1;
+       data->enable_ew = of_property_read_bool(np, "ti,davinci-cs-ew");
+       data->enable_ss = of_property_read_bool(np, "ti,davinci-cs-ss");
+       return 0;
+}
+
+static const struct of_device_id davinci_aemif_of_match[] = {
+       { .compatible = "ti,davinci-aemif", },
+       { .compatible = "ti,keystone-aemif", },
+       { .compatible = "ti,omap-L138-aemif", },
+       {},
+};
+
+static const struct of_device_id davinci_cs_of_match[] = {
+       { .compatible = "ti,davinci-cs", },
+       {},
+};
+
+static int davinci_aemif_probe(struct platform_device *pdev)
+{
+       int ret  = -ENODEV, i;
+       struct resource *res;
+       struct device *dev = &pdev->dev;
+       struct device_node *np = dev->of_node;
+
+       if (np == NULL)
+               return 0;
+
+       if (aemif) {
+               dev_err(dev, "davinci_aemif driver is in use currently\n");
+               return -EBUSY;
+       }
+
+       aemif = devm_kzalloc(dev, sizeof(*aemif), GFP_KERNEL);
+
+       if (!aemif) {
+               dev_err(dev, "cannot allocate memory for aemif\n");
+               return -ENOMEM;
+       }
+
+       aemif->clk = devm_clk_get(dev, "aemif");
+       if (IS_ERR(aemif->clk)) {
+               dev_err(dev, "cannot get clock 'aemif'\n");
+               return PTR_ERR(aemif->clk);
+       }
+
+       clk_prepare_enable(aemif->clk);
+       aemif->clk_rate = clk_get_rate(aemif->clk) / 1000;
+
+       aemif->dev = dev;
+
+       if (of_device_is_compatible(np, "ti,omap-L138-aemif"))
+               aemif->cs_offset = 2;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       aemif->base = devm_ioremap_resource(dev, res);
+       if (IS_ERR(aemif->base)) {
+               ret = PTR_ERR(aemif->base);
+               goto error;
+       }
+
+       /*
+        * For every controller device node, there is a cs device node that
+        * describe the bus configuration parameters. This functions iterate
+        * over these nodes and update the cs data array.
+        */
+       for_each_matching_node(np, of_match_ptr(davinci_cs_of_match)) {
+               ret = of_davinci_aemif_parse_abus_config(np);
+               if (ret < 0)
+                       goto error;
+       }
+
+       for (i = 0; i < aemif->num_cs; i++) {
+               ret = davinci_aemif_config_abus(&aemif->cs_data[i]);
+               if (ret < 0) {
+                       dev_err(dev, "Error configuring chip select %d\n",
+                               aemif->cs_data[i].cs);
+                       goto error;
+               }
+       }
+
+       /*
+        * Create a child devices explicitly from here to
+        * guarantee that the child will be probed after the AEMIF timing
+        * parameters are set.
+        */
+       for_each_matching_node(np, of_match_ptr(davinci_cs_of_match)) {
+               ret = of_platform_populate(np, NULL, NULL, dev);
+               if (ret < 0)
+                       goto error;
+       }
+
+       return 0;
+error:
+       clk_disable_unprepare(aemif->clk);
+       return ret;
+}
+
+static int davinci_aemif_remove(struct platform_device *pdev)
+{
+       clk_disable_unprepare(aemif->clk);
+       return 0;
+}
+
+static struct platform_driver davinci_aemif_driver = {
+       .probe = davinci_aemif_probe,
+       .remove = davinci_aemif_remove,
+       .driver = {
+               .name = DRV_NAME,
+               .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(davinci_aemif_of_match),
+       },
+};
+
+module_platform_driver(davinci_aemif_driver);
+
+MODULE_AUTHOR("Murali Karicheri <m-karicheri2 at ti.com>");
+MODULE_AUTHOR("Ivan Khoronzhuk <ivan.khoronzhuk at ti.com>");
+MODULE_DESCRIPTION("Texas Instruments AEMIF driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
--
1.7.9.5




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