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authorOlof Johansson <olof@lixom.net>2018-01-05 10:12:57 +0300
committerOlof Johansson <olof@lixom.net>2018-01-05 10:12:57 +0300
commit11077e9bf7fef8b1081221b482260a6bfa2b6d5f (patch)
tree9867459628434bb88338cdade7fb58ee2ec3a378 /drivers/memory
parent8102324d862f50360646da6391019b8d0ccaf76c (diff)
parentaefc5818553680c50c9f6840e47c01b80edd9b3a (diff)
downloadlinux-11077e9bf7fef8b1081221b482260a6bfa2b6d5f.tar.xz
Merge tag 'keystone_driver_soc_for_4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone into next/drivers
SOC: Keystone Soc driver updates for 4.16 - TI EMIF-SRAM driver - TI SCI print format fix - Navigator strndup lenth fix * tag 'keystone_driver_soc_for_4.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone: soc: ti: fix max dup length for kstrndup firmware: ti_sci: Use %zu for size_t print format memory: ti-emif-sram: remove unused variable memory: ti-emif-sram: introduce relocatable suspend/resume handlers Documentation: dt: Update ti,emif bindings Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/Kconfig10
-rw-r--r--drivers/memory/Makefile8
-rw-r--r--drivers/memory/Makefile.asm-offsets5
-rw-r--r--drivers/memory/emif-asm-offsets.c92
-rw-r--r--drivers/memory/emif.h17
-rw-r--r--drivers/memory/ti-emif-pm.c324
-rw-r--r--drivers/memory/ti-emif-sram-pm.S334
7 files changed, 790 insertions, 0 deletions
diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index ffc350258041..19a0e83f260d 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -84,6 +84,16 @@ config OMAP_GPMC_DEBUG
bootloader or else the GPMC timings won't be identical with the
bootloader timings.
+config TI_EMIF_SRAM
+ tristate "Texas Instruments EMIF SRAM driver"
+ depends on (SOC_AM33XX || SOC_AM43XX) && SRAM
+ help
+ This driver is for the EMIF module available on Texas Instruments
+ AM33XX and AM43XX SoCs and is required for PM. Certain parts of
+ the EMIF PM code must run from on-chip SRAM late in the suspend
+ sequence so this driver provides several relocatable PM functions
+ for the SoC PM code to use.
+
config MVEBU_DEVBUS
bool "Marvell EBU Device Bus Controller"
default y
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index 929a601d4cd1..66f55240830e 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -23,3 +23,11 @@ obj-$(CONFIG_DA8XX_DDRCTL) += da8xx-ddrctl.o
obj-$(CONFIG_SAMSUNG_MC) += samsung/
obj-$(CONFIG_TEGRA_MC) += tegra/
+obj-$(CONFIG_TI_EMIF_SRAM) += ti-emif-sram.o
+ti-emif-sram-objs := ti-emif-pm.o ti-emif-sram-pm.o
+
+AFLAGS_ti-emif-sram-pm.o :=-Wa,-march=armv7-a
+
+include drivers/memory/Makefile.asm-offsets
+
+drivers/memory/ti-emif-sram-pm.o: include/generated/ti-emif-asm-offsets.h
diff --git a/drivers/memory/Makefile.asm-offsets b/drivers/memory/Makefile.asm-offsets
new file mode 100644
index 000000000000..843ff60ccb5a
--- /dev/null
+++ b/drivers/memory/Makefile.asm-offsets
@@ -0,0 +1,5 @@
+drivers/memory/emif-asm-offsets.s: drivers/memory/emif-asm-offsets.c
+ $(call if_changed_dep,cc_s_c)
+
+include/generated/ti-emif-asm-offsets.h: drivers/memory/emif-asm-offsets.s FORCE
+ $(call filechk,offsets,__TI_EMIF_ASM_OFFSETS_H__)
diff --git a/drivers/memory/emif-asm-offsets.c b/drivers/memory/emif-asm-offsets.c
new file mode 100644
index 000000000000..71a89d5d3efd
--- /dev/null
+++ b/drivers/memory/emif-asm-offsets.c
@@ -0,0 +1,92 @@
+/*
+ * TI AM33XX EMIF PM Assembly Offsets
+ *
+ * Copyright (C) 2016-2017 Texas Instruments Inc.
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/ti-emif-sram.h>
+
+int main(void)
+{
+ DEFINE(EMIF_SDCFG_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_sdcfg_val));
+ DEFINE(EMIF_TIMING1_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_timing1_val));
+ DEFINE(EMIF_TIMING2_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_timing2_val));
+ DEFINE(EMIF_TIMING3_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_timing3_val));
+ DEFINE(EMIF_REF_CTRL_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_ref_ctrl_val));
+ DEFINE(EMIF_ZQCFG_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_zqcfg_val));
+ DEFINE(EMIF_PMCR_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_pmcr_val));
+ DEFINE(EMIF_PMCR_SHDW_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_pmcr_shdw_val));
+ DEFINE(EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_rd_wr_level_ramp_ctrl));
+ DEFINE(EMIF_RD_WR_EXEC_THRESH_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_rd_wr_exec_thresh));
+ DEFINE(EMIF_COS_CONFIG_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_cos_config));
+ DEFINE(EMIF_PRIORITY_TO_COS_MAPPING_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_priority_to_cos_mapping));
+ DEFINE(EMIF_CONNECT_ID_SERV_1_MAP_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_connect_id_serv_1_map));
+ DEFINE(EMIF_CONNECT_ID_SERV_2_MAP_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_connect_id_serv_2_map));
+ DEFINE(EMIF_OCP_CONFIG_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_ocp_config_val));
+ DEFINE(EMIF_LPDDR2_NVM_TIM_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_lpddr2_nvm_tim));
+ DEFINE(EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_lpddr2_nvm_tim_shdw));
+ DEFINE(EMIF_DLL_CALIB_CTRL_VAL_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_dll_calib_ctrl_val));
+ DEFINE(EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_dll_calib_ctrl_val_shdw));
+ DEFINE(EMIF_DDR_PHY_CTLR_1_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_ddr_phy_ctlr_1));
+ DEFINE(EMIF_EXT_PHY_CTRL_VALS_OFFSET,
+ offsetof(struct emif_regs_amx3, emif_ext_phy_ctrl_vals));
+ DEFINE(EMIF_REGS_AMX3_SIZE, sizeof(struct emif_regs_amx3));
+
+ BLANK();
+
+ DEFINE(EMIF_PM_BASE_ADDR_VIRT_OFFSET,
+ offsetof(struct ti_emif_pm_data, ti_emif_base_addr_virt));
+ DEFINE(EMIF_PM_BASE_ADDR_PHYS_OFFSET,
+ offsetof(struct ti_emif_pm_data, ti_emif_base_addr_phys));
+ DEFINE(EMIF_PM_CONFIG_OFFSET,
+ offsetof(struct ti_emif_pm_data, ti_emif_sram_config));
+ DEFINE(EMIF_PM_REGS_VIRT_OFFSET,
+ offsetof(struct ti_emif_pm_data, regs_virt));
+ DEFINE(EMIF_PM_REGS_PHYS_OFFSET,
+ offsetof(struct ti_emif_pm_data, regs_phys));
+ DEFINE(EMIF_PM_DATA_SIZE, sizeof(struct ti_emif_pm_data));
+
+ BLANK();
+
+ DEFINE(EMIF_PM_SAVE_CONTEXT_OFFSET,
+ offsetof(struct ti_emif_pm_functions, save_context));
+ DEFINE(EMIF_PM_RESTORE_CONTEXT_OFFSET,
+ offsetof(struct ti_emif_pm_functions, restore_context));
+ DEFINE(EMIF_PM_ENTER_SR_OFFSET,
+ offsetof(struct ti_emif_pm_functions, enter_sr));
+ DEFINE(EMIF_PM_EXIT_SR_OFFSET,
+ offsetof(struct ti_emif_pm_functions, exit_sr));
+ DEFINE(EMIF_PM_ABORT_SR_OFFSET,
+ offsetof(struct ti_emif_pm_functions, abort_sr));
+ DEFINE(EMIF_PM_FUNCTIONS_SIZE, sizeof(struct ti_emif_pm_functions));
+
+ return 0;
+}
diff --git a/drivers/memory/emif.h b/drivers/memory/emif.h
index bfe08bae961a..9e9f8037955d 100644
--- a/drivers/memory/emif.h
+++ b/drivers/memory/emif.h
@@ -555,6 +555,9 @@
#define READ_LATENCY_SHDW_SHIFT 0
#define READ_LATENCY_SHDW_MASK (0x1f << 0)
+#define EMIF_SRAM_AM33_REG_LAYOUT 0x00000000
+#define EMIF_SRAM_AM43_REG_LAYOUT 0x00000001
+
#ifndef __ASSEMBLY__
/*
* Structure containing shadow of important registers in EMIF
@@ -585,5 +588,19 @@ struct emif_regs {
u32 ext_phy_ctrl_3_shdw;
u32 ext_phy_ctrl_4_shdw;
};
+
+struct ti_emif_pm_functions;
+
+extern unsigned int ti_emif_sram;
+extern unsigned int ti_emif_sram_sz;
+extern struct ti_emif_pm_data ti_emif_pm_sram_data;
+extern struct emif_regs_amx3 ti_emif_regs_amx3;
+
+void ti_emif_save_context(void);
+void ti_emif_restore_context(void);
+void ti_emif_enter_sr(void);
+void ti_emif_exit_sr(void);
+void ti_emif_abort_sr(void);
+
#endif /* __ASSEMBLY__ */
#endif /* __EMIF_H */
diff --git a/drivers/memory/ti-emif-pm.c b/drivers/memory/ti-emif-pm.c
new file mode 100644
index 000000000000..62a86c4bcd0b
--- /dev/null
+++ b/drivers/memory/ti-emif-pm.c
@@ -0,0 +1,324 @@
+/*
+ * TI AM33XX SRAM EMIF Driver
+ *
+ * Copyright (C) 2016-2017 Texas Instruments Inc.
+ * Dave Gerlach
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/genalloc.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>
+#include <linux/sram.h>
+#include <linux/ti-emif-sram.h>
+
+#include "emif.h"
+
+#define TI_EMIF_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
+ (unsigned long)&ti_emif_sram)
+
+#define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0
+
+struct ti_emif_data {
+ phys_addr_t ti_emif_sram_phys;
+ phys_addr_t ti_emif_sram_data_phys;
+ unsigned long ti_emif_sram_virt;
+ unsigned long ti_emif_sram_data_virt;
+ struct gen_pool *sram_pool_code;
+ struct gen_pool *sram_pool_data;
+ struct ti_emif_pm_data pm_data;
+ struct ti_emif_pm_functions pm_functions;
+};
+
+static struct ti_emif_data *emif_instance;
+
+static u32 sram_suspend_address(struct ti_emif_data *emif_data,
+ unsigned long addr)
+{
+ return (emif_data->ti_emif_sram_virt +
+ TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
+}
+
+static phys_addr_t sram_resume_address(struct ti_emif_data *emif_data,
+ unsigned long addr)
+{
+ return ((unsigned long)emif_data->ti_emif_sram_phys +
+ TI_EMIF_SRAM_SYMBOL_OFFSET(addr));
+}
+
+static void ti_emif_free_sram(struct ti_emif_data *emif_data)
+{
+ gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
+ ti_emif_sram_sz);
+ gen_pool_free(emif_data->sram_pool_data,
+ emif_data->ti_emif_sram_data_virt,
+ sizeof(struct emif_regs_amx3));
+}
+
+static int ti_emif_alloc_sram(struct device *dev,
+ struct ti_emif_data *emif_data)
+{
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ emif_data->sram_pool_code = of_gen_pool_get(np, "sram", 0);
+ if (!emif_data->sram_pool_code) {
+ dev_err(dev, "Unable to get sram pool for ocmcram code\n");
+ return -ENODEV;
+ }
+
+ emif_data->ti_emif_sram_virt =
+ gen_pool_alloc(emif_data->sram_pool_code,
+ ti_emif_sram_sz);
+ if (!emif_data->ti_emif_sram_virt) {
+ dev_err(dev, "Unable to allocate code memory from ocmcram\n");
+ return -ENOMEM;
+ }
+
+ /* Save physical address to calculate resume offset during pm init */
+ emif_data->ti_emif_sram_phys =
+ gen_pool_virt_to_phys(emif_data->sram_pool_code,
+ emif_data->ti_emif_sram_virt);
+
+ /* Get sram pool for data section and allocate space */
+ emif_data->sram_pool_data = of_gen_pool_get(np, "sram", 1);
+ if (!emif_data->sram_pool_data) {
+ dev_err(dev, "Unable to get sram pool for ocmcram data\n");
+ ret = -ENODEV;
+ goto err_free_sram_code;
+ }
+
+ emif_data->ti_emif_sram_data_virt =
+ gen_pool_alloc(emif_data->sram_pool_data,
+ sizeof(struct emif_regs_amx3));
+ if (!emif_data->ti_emif_sram_data_virt) {
+ dev_err(dev, "Unable to allocate data memory from ocmcram\n");
+ ret = -ENOMEM;
+ goto err_free_sram_code;
+ }
+
+ /* Save physical address to calculate resume offset during pm init */
+ emif_data->ti_emif_sram_data_phys =
+ gen_pool_virt_to_phys(emif_data->sram_pool_data,
+ emif_data->ti_emif_sram_data_virt);
+ /*
+ * These functions are called during suspend path while MMU is
+ * still on so add virtual base to offset for absolute address
+ */
+ emif_data->pm_functions.save_context =
+ sram_suspend_address(emif_data,
+ (unsigned long)ti_emif_save_context);
+ emif_data->pm_functions.enter_sr =
+ sram_suspend_address(emif_data,
+ (unsigned long)ti_emif_enter_sr);
+ emif_data->pm_functions.abort_sr =
+ sram_suspend_address(emif_data,
+ (unsigned long)ti_emif_abort_sr);
+
+ /*
+ * These are called during resume path when MMU is not enabled
+ * so physical address is used instead
+ */
+ emif_data->pm_functions.restore_context =
+ sram_resume_address(emif_data,
+ (unsigned long)ti_emif_restore_context);
+ emif_data->pm_functions.exit_sr =
+ sram_resume_address(emif_data,
+ (unsigned long)ti_emif_exit_sr);
+
+ emif_data->pm_data.regs_virt =
+ (struct emif_regs_amx3 *)emif_data->ti_emif_sram_data_virt;
+ emif_data->pm_data.regs_phys = emif_data->ti_emif_sram_data_phys;
+
+ return 0;
+
+err_free_sram_code:
+ gen_pool_free(emif_data->sram_pool_code, emif_data->ti_emif_sram_virt,
+ ti_emif_sram_sz);
+ return ret;
+}
+
+static int ti_emif_push_sram(struct device *dev, struct ti_emif_data *emif_data)
+{
+ void *copy_addr;
+ u32 data_addr;
+
+ copy_addr = sram_exec_copy(emif_data->sram_pool_code,
+ (void *)emif_data->ti_emif_sram_virt,
+ &ti_emif_sram, ti_emif_sram_sz);
+ if (!copy_addr) {
+ dev_err(dev, "Cannot copy emif code to sram\n");
+ return -ENODEV;
+ }
+
+ data_addr = sram_suspend_address(emif_data,
+ (unsigned long)&ti_emif_pm_sram_data);
+ copy_addr = sram_exec_copy(emif_data->sram_pool_code,
+ (void *)data_addr,
+ &emif_data->pm_data,
+ sizeof(emif_data->pm_data));
+ if (!copy_addr) {
+ dev_err(dev, "Cannot copy emif data to code sram\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * Due to Usage Note 3.1.2 "DDR3: JEDEC Compliance for Maximum
+ * Self-Refresh Command Limit" found in AM335x Silicon Errata
+ * (Document SPRZ360F Revised November 2013) we must configure
+ * the self refresh delay timer to 0xA (8192 cycles) to avoid
+ * generating too many refresh command from the EMIF.
+ */
+static void ti_emif_configure_sr_delay(struct ti_emif_data *emif_data)
+{
+ writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
+ (emif_data->pm_data.ti_emif_base_addr_virt +
+ EMIF_POWER_MANAGEMENT_CONTROL));
+
+ writel(EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES,
+ (emif_data->pm_data.ti_emif_base_addr_virt +
+ EMIF_POWER_MANAGEMENT_CTRL_SHDW));
+}
+
+/**
+ * ti_emif_copy_pm_function_table - copy mapping of pm funcs in sram
+ * @sram_pool: pointer to struct gen_pool where dst resides
+ * @dst: void * to address that table should be copied
+ *
+ * Returns 0 if success other error code if table is not available
+ */
+int ti_emif_copy_pm_function_table(struct gen_pool *sram_pool, void *dst)
+{
+ void *copy_addr;
+
+ if (!emif_instance)
+ return -ENODEV;
+
+ copy_addr = sram_exec_copy(sram_pool, dst,
+ &emif_instance->pm_functions,
+ sizeof(emif_instance->pm_functions));
+ if (!copy_addr)
+ return -ENODEV;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ti_emif_copy_pm_function_table);
+
+/**
+ * ti_emif_get_mem_type - return type for memory type in use
+ *
+ * Returns memory type value read from EMIF or error code if fails
+ */
+int ti_emif_get_mem_type(void)
+{
+ unsigned long temp;
+
+ if (!emif_instance)
+ return -ENODEV;
+
+ temp = readl(emif_instance->pm_data.ti_emif_base_addr_virt +
+ EMIF_SDRAM_CONFIG);
+
+ temp = (temp & SDRAM_TYPE_MASK) >> SDRAM_TYPE_SHIFT;
+ return temp;
+}
+EXPORT_SYMBOL_GPL(ti_emif_get_mem_type);
+
+static const struct of_device_id ti_emif_of_match[] = {
+ { .compatible = "ti,emif-am3352", .data =
+ (void *)EMIF_SRAM_AM33_REG_LAYOUT, },
+ { .compatible = "ti,emif-am4372", .data =
+ (void *)EMIF_SRAM_AM43_REG_LAYOUT, },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ti_emif_of_match);
+
+static int ti_emif_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+ const struct of_device_id *match;
+ struct ti_emif_data *emif_data;
+
+ emif_data = devm_kzalloc(dev, sizeof(*emif_data), GFP_KERNEL);
+ if (!emif_data)
+ return -ENOMEM;
+
+ match = of_match_device(ti_emif_of_match, &pdev->dev);
+ if (!match)
+ return -ENODEV;
+
+ emif_data->pm_data.ti_emif_sram_config = (unsigned long)match->data;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ emif_data->pm_data.ti_emif_base_addr_virt = devm_ioremap_resource(dev,
+ res);
+ if (IS_ERR(emif_data->pm_data.ti_emif_base_addr_virt)) {
+ dev_err(dev, "could not ioremap emif mem\n");
+ ret = PTR_ERR(emif_data->pm_data.ti_emif_base_addr_virt);
+ return ret;
+ }
+
+ emif_data->pm_data.ti_emif_base_addr_phys = res->start;
+
+ ti_emif_configure_sr_delay(emif_data);
+
+ ret = ti_emif_alloc_sram(dev, emif_data);
+ if (ret)
+ return ret;
+
+ ret = ti_emif_push_sram(dev, emif_data);
+ if (ret)
+ goto fail_free_sram;
+
+ emif_instance = emif_data;
+
+ return 0;
+
+fail_free_sram:
+ ti_emif_free_sram(emif_data);
+
+ return ret;
+}
+
+static int ti_emif_remove(struct platform_device *pdev)
+{
+ struct ti_emif_data *emif_data = emif_instance;
+
+ emif_instance = NULL;
+
+ ti_emif_free_sram(emif_data);
+
+ return 0;
+}
+
+static struct platform_driver ti_emif_driver = {
+ .probe = ti_emif_probe,
+ .remove = ti_emif_remove,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = of_match_ptr(ti_emif_of_match),
+ },
+};
+module_platform_driver(ti_emif_driver);
+
+MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
+MODULE_DESCRIPTION("Texas Instruments SRAM EMIF driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/memory/ti-emif-sram-pm.S b/drivers/memory/ti-emif-sram-pm.S
new file mode 100644
index 000000000000..a5369181e5c2
--- /dev/null
+++ b/drivers/memory/ti-emif-sram-pm.S
@@ -0,0 +1,334 @@
+/*
+ * Low level PM code for TI EMIF
+ *
+ * Copyright (C) 2016-2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Dave Gerlach
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <generated/ti-emif-asm-offsets.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/memory.h>
+
+#include "emif.h"
+
+#define EMIF_POWER_MGMT_WAIT_SELF_REFRESH_8192_CYCLES 0x00a0
+#define EMIF_POWER_MGMT_SR_TIMER_MASK 0x00f0
+#define EMIF_POWER_MGMT_SELF_REFRESH_MODE 0x0200
+#define EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK 0x0700
+
+#define EMIF_SDCFG_TYPE_DDR2 0x2 << SDRAM_TYPE_SHIFT
+#define EMIF_STATUS_READY 0x4
+
+#define AM43XX_EMIF_PHY_CTRL_REG_COUNT 0x120
+
+#define EMIF_AM437X_REGISTERS 0x1
+
+ .arm
+ .align 3
+
+ENTRY(ti_emif_sram)
+
+/*
+ * void ti_emif_save_context(void)
+ *
+ * Used during suspend to save the context of all required EMIF registers
+ * to local memory if the EMIF is going to lose context during the sleep
+ * transition. Operates on the VIRTUAL address of the EMIF.
+ */
+ENTRY(ti_emif_save_context)
+ stmfd sp!, {r4 - r11, lr} @ save registers on stack
+
+ adr r4, ti_emif_pm_sram_data
+ ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
+ ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
+
+ /* Save EMIF configuration */
+ ldr r1, [r0, #EMIF_SDRAM_CONFIG]
+ str r1, [r2, #EMIF_SDCFG_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL]
+ str r1, [r2, #EMIF_REF_CTRL_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_SDRAM_TIMING_1]
+ str r1, [r2, #EMIF_TIMING1_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_SDRAM_TIMING_2]
+ str r1, [r2, #EMIF_TIMING2_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_SDRAM_TIMING_3]
+ str r1, [r2, #EMIF_TIMING3_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+ str r1, [r2, #EMIF_PMCR_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW]
+ str r1, [r2, #EMIF_PMCR_SHDW_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
+ str r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_DDR_PHY_CTRL_1]
+ str r1, [r2, #EMIF_DDR_PHY_CTLR_1_OFFSET]
+
+ ldr r1, [r0, #EMIF_COS_CONFIG]
+ str r1, [r2, #EMIF_COS_CONFIG_OFFSET]
+
+ ldr r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING]
+ str r1, [r2, #EMIF_PRIORITY_TO_COS_MAPPING_OFFSET]
+
+ ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING]
+ str r1, [r2, #EMIF_CONNECT_ID_SERV_1_MAP_OFFSET]
+
+ ldr r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING]
+ str r1, [r2, #EMIF_CONNECT_ID_SERV_2_MAP_OFFSET]
+
+ ldr r1, [r0, #EMIF_OCP_CONFIG]
+ str r1, [r2, #EMIF_OCP_CONFIG_VAL_OFFSET]
+
+ ldr r5, [r4, #EMIF_PM_CONFIG_OFFSET]
+ cmp r5, #EMIF_SRAM_AM43_REG_LAYOUT
+ bne emif_skip_save_extra_regs
+
+ ldr r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL]
+ str r1, [r2, #EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET]
+
+ ldr r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD]
+ str r1, [r2, #EMIF_RD_WR_EXEC_THRESH_OFFSET]
+
+ ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING]
+ str r1, [r2, #EMIF_LPDDR2_NVM_TIM_OFFSET]
+
+ ldr r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW]
+ str r1, [r2, #EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET]
+
+ ldr r1, [r0, #EMIF_DLL_CALIB_CTRL]
+ str r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_OFFSET]
+
+ ldr r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW]
+ str r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET]
+
+ /* Loop and save entire block of emif phy regs */
+ mov r5, #0x0
+ add r4, r2, #EMIF_EXT_PHY_CTRL_VALS_OFFSET
+ add r3, r0, #EMIF_EXT_PHY_CTRL_1
+ddr_phy_ctrl_save:
+ ldr r1, [r3, r5]
+ str r1, [r4, r5]
+ add r5, r5, #0x4
+ cmp r5, #AM43XX_EMIF_PHY_CTRL_REG_COUNT
+ bne ddr_phy_ctrl_save
+
+emif_skip_save_extra_regs:
+ ldmfd sp!, {r4 - r11, pc} @ restore regs and return
+ENDPROC(ti_emif_save_context)
+
+/*
+ * void ti_emif_restore_context(void)
+ *
+ * Used during resume to restore the context of all required EMIF registers
+ * from local memory after the EMIF has lost context during a sleep transition.
+ * Operates on the PHYSICAL address of the EMIF.
+ */
+ENTRY(ti_emif_restore_context)
+ adr r4, ti_emif_pm_sram_data
+ ldr r0, [r4, #EMIF_PM_BASE_ADDR_PHYS_OFFSET]
+ ldr r2, [r4, #EMIF_PM_REGS_PHYS_OFFSET]
+
+ /* Config EMIF Timings */
+ ldr r1, [r2, #EMIF_DDR_PHY_CTLR_1_OFFSET]
+ str r1, [r0, #EMIF_DDR_PHY_CTRL_1]
+ str r1, [r0, #EMIF_DDR_PHY_CTRL_1_SHDW]
+
+ ldr r1, [r2, #EMIF_TIMING1_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_TIMING_1]
+ str r1, [r0, #EMIF_SDRAM_TIMING_1_SHDW]
+
+ ldr r1, [r2, #EMIF_TIMING2_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_TIMING_2]
+ str r1, [r0, #EMIF_SDRAM_TIMING_2_SHDW]
+
+ ldr r1, [r2, #EMIF_TIMING3_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_TIMING_3]
+ str r1, [r0, #EMIF_SDRAM_TIMING_3_SHDW]
+
+ ldr r1, [r2, #EMIF_REF_CTRL_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_REFRESH_CONTROL]
+ str r1, [r0, #EMIF_SDRAM_REFRESH_CTRL_SHDW]
+
+ ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+
+ ldr r1, [r2, #EMIF_PMCR_SHDW_VAL_OFFSET]
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CTRL_SHDW]
+
+ ldr r1, [r2, #EMIF_COS_CONFIG_OFFSET]
+ str r1, [r0, #EMIF_COS_CONFIG]
+
+ ldr r1, [r2, #EMIF_PRIORITY_TO_COS_MAPPING_OFFSET]
+ str r1, [r0, #EMIF_PRIORITY_TO_CLASS_OF_SERVICE_MAPPING]
+
+ ldr r1, [r2, #EMIF_CONNECT_ID_SERV_1_MAP_OFFSET]
+ str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_1_MAPPING]
+
+ ldr r1, [r2, #EMIF_CONNECT_ID_SERV_2_MAP_OFFSET]
+ str r1, [r0, #EMIF_CONNECTION_ID_TO_CLASS_OF_SERVICE_2_MAPPING]
+
+ ldr r1, [r2, #EMIF_OCP_CONFIG_VAL_OFFSET]
+ str r1, [r0, #EMIF_OCP_CONFIG]
+
+ ldr r5, [r4, #EMIF_PM_CONFIG_OFFSET]
+ cmp r5, #EMIF_SRAM_AM43_REG_LAYOUT
+ bne emif_skip_restore_extra_regs
+
+ ldr r1, [r2, #EMIF_RD_WR_LEVEL_RAMP_CTRL_OFFSET]
+ str r1, [r0, #EMIF_READ_WRITE_LEVELING_RAMP_CONTROL]
+
+ ldr r1, [r2, #EMIF_RD_WR_EXEC_THRESH_OFFSET]
+ str r1, [r0, #EMIF_READ_WRITE_EXECUTION_THRESHOLD]
+
+ ldr r1, [r2, #EMIF_LPDDR2_NVM_TIM_OFFSET]
+ str r1, [r0, #EMIF_LPDDR2_NVM_TIMING]
+
+ ldr r1, [r2, #EMIF_LPDDR2_NVM_TIM_SHDW_OFFSET]
+ str r1, [r0, #EMIF_LPDDR2_NVM_TIMING_SHDW]
+
+ ldr r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_OFFSET]
+ str r1, [r0, #EMIF_DLL_CALIB_CTRL]
+
+ ldr r1, [r2, #EMIF_DLL_CALIB_CTRL_VAL_SHDW_OFFSET]
+ str r1, [r0, #EMIF_DLL_CALIB_CTRL_SHDW]
+
+ ldr r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
+
+ /* Loop and restore entire block of emif phy regs */
+ mov r5, #0x0
+ /* Load ti_emif_regs_amx3 + EMIF_EXT_PHY_CTRL_VALS_OFFSET for address
+ * to phy register save space
+ */
+ add r3, r2, #EMIF_EXT_PHY_CTRL_VALS_OFFSET
+ add r4, r0, #EMIF_EXT_PHY_CTRL_1
+ddr_phy_ctrl_restore:
+ ldr r1, [r3, r5]
+ str r1, [r4, r5]
+ add r5, r5, #0x4
+ cmp r5, #AM43XX_EMIF_PHY_CTRL_REG_COUNT
+ bne ddr_phy_ctrl_restore
+
+emif_skip_restore_extra_regs:
+ /*
+ * Output impedence calib needed only for DDR3
+ * but since the initial state of this will be
+ * disabled for DDR2 no harm in restoring the
+ * old configuration
+ */
+ ldr r1, [r2, #EMIF_ZQCFG_VAL_OFFSET]
+ str r1, [r0, #EMIF_SDRAM_OUTPUT_IMPEDANCE_CALIBRATION_CONFIG]
+
+ /* Write to sdcfg last for DDR2 only */
+ ldr r1, [r2, #EMIF_SDCFG_VAL_OFFSET]
+ and r2, r1, #SDRAM_TYPE_MASK
+ cmp r2, #EMIF_SDCFG_TYPE_DDR2
+ streq r1, [r0, #EMIF_SDRAM_CONFIG]
+
+ mov pc, lr
+ENDPROC(ti_emif_restore_context)
+
+/*
+ * void ti_emif_enter_sr(void)
+ *
+ * Programs the EMIF to tell the SDRAM to enter into self-refresh
+ * mode during a sleep transition. Operates on the VIRTUAL address
+ * of the EMIF.
+ */
+ENTRY(ti_emif_enter_sr)
+ stmfd sp!, {r4 - r11, lr} @ save registers on stack
+
+ adr r4, ti_emif_pm_sram_data
+ ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
+ ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
+
+ ldr r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+ bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
+ orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+
+ ldmfd sp!, {r4 - r11, pc} @ restore regs and return
+ENDPROC(ti_emif_enter_sr)
+
+/*
+ * void ti_emif_exit_sr(void)
+ *
+ * Programs the EMIF to tell the SDRAM to exit self-refresh mode
+ * after a sleep transition. Operates on the PHYSICAL address of
+ * the EMIF.
+ */
+ENTRY(ti_emif_exit_sr)
+ adr r4, ti_emif_pm_sram_data
+ ldr r0, [r4, #EMIF_PM_BASE_ADDR_PHYS_OFFSET]
+ ldr r2, [r4, #EMIF_PM_REGS_PHYS_OFFSET]
+
+ /*
+ * Toggle EMIF to exit refresh mode:
+ * if EMIF lost context, PWR_MGT_CTRL is currently 0, writing disable
+ * (0x0), wont do diddly squat! so do a toggle from SR(0x2) to disable
+ * (0x0) here.
+ * *If* EMIF did not lose context, nothing broken as we write the same
+ * value(0x2) to reg before we write a disable (0x0).
+ */
+ ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
+ bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
+ orr r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+ bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+
+ /* Wait for EMIF to become ready */
+1: ldr r1, [r0, #EMIF_STATUS]
+ tst r1, #EMIF_STATUS_READY
+ beq 1b
+
+ mov pc, lr
+ENDPROC(ti_emif_exit_sr)
+
+/*
+ * void ti_emif_abort_sr(void)
+ *
+ * Disables self-refresh after a failed transition to a low-power
+ * state so the kernel can jump back to DDR and follow abort path.
+ * Operates on the VIRTUAL address of the EMIF.
+ */
+ENTRY(ti_emif_abort_sr)
+ stmfd sp!, {r4 - r11, lr} @ save registers on stack
+
+ adr r4, ti_emif_pm_sram_data
+ ldr r0, [r4, #EMIF_PM_BASE_ADDR_VIRT_OFFSET]
+ ldr r2, [r4, #EMIF_PM_REGS_VIRT_OFFSET]
+
+ ldr r1, [r2, #EMIF_PMCR_VAL_OFFSET]
+ bic r1, r1, #EMIF_POWER_MGMT_SELF_REFRESH_MODE_MASK
+ str r1, [r0, #EMIF_POWER_MANAGEMENT_CONTROL]
+
+ /* Wait for EMIF to become ready */
+1: ldr r1, [r0, #EMIF_STATUS]
+ tst r1, #EMIF_STATUS_READY
+ beq 1b
+
+ ldmfd sp!, {r4 - r11, pc} @ restore regs and return
+ENDPROC(ti_emif_abort_sr)
+
+ .align 3
+ENTRY(ti_emif_pm_sram_data)
+ .space EMIF_PM_DATA_SIZE
+ENTRY(ti_emif_sram_sz)
+ .word . - ti_emif_save_context