[PATCH v8 1/2] memory: add Atmel EBI (External Bus Interface) driver

Boris Brezillon
2016-05-11T10:13:07Z

should be configured by the controller driver through the matrix and
smc syscon regmaps.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/memory/Kconfig | 11 +
drivers/memory/Makefile | 1 +
drivers/memory/atmel-ebi.c | 771 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 783 insertions(+)
create mode 100644 drivers/memory/atmel-ebi.c

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index 51d5cd2..4780136 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -25,6 +25,17 @@ config ATMEL_SDRAMC
Starting with the at91sam9g45, this controller supports SDR, DDR and
LP-DDR memories.

+config ATMEL_EBI
+ bool "Atmel EBI driver"
+ default y
+ depends on ARCH_AT91 && OF
+ select MFD_SYSCON
+ help
+ Driver for Atmel EBI controller.
+ Used to configure the EBI (external bus interface) when the device-
+ tree is used. This bus supports NANDs, external ethernet controller,
+ SRAMs, ATA devices, etc.
+
config TI_AEMIF
tristate "Texas Instruments AEMIF driver"
depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index 890bdf4..965da6b 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_OF) += of_memory.o
endif
obj-$(CONFIG_ARM_PL172_MPMC) += pl172.o
obj-$(CONFIG_ATMEL_SDRAMC) += atmel-sdramc.o
+obj-$(CONFIG_ATMEL_EBI) += atmel-ebi.o
obj-$(CONFIG_TI_AEMIF) += ti-aemif.o
obj-$(CONFIG_TI_EMIF) += emif.o
obj-$(CONFIG_OMAP_GPMC) += omap-gpmc.o
diff --git a/drivers/memory/atmel-ebi.c b/drivers/memory/atmel-ebi.c
new file mode 100644
index 0000000..712c767
--- /dev/null
+++ b/drivers/memory/atmel-ebi.c
@@ -0,0 +1,771 @@
+/*
+ * EBI driver for Atmel chips
+ * inspired by the fsl weim bus driver
+ *
+ * Copyright (C) 2013 JJ Hiblot.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/atmel-matrix.h>
+#include <linux/mfd/syscon/atmel-smc.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+struct at91sam9_smc_timings {
+ u32 ncs_rd_setup_ns;
+ u32 nrd_setup_ns;
+ u32 ncs_wr_setup_ns;
+ u32 nwe_setup_ns;
+ u32 ncs_rd_pulse_ns;
+ u32 nrd_pulse_ns;
+ u32 ncs_wr_pulse_ns;
+ u32 nwe_pulse_ns;
+ u32 nrd_cycle_ns;
+ u32 nwe_cycle_ns;
+ u32 tdf_ns;
+};
+
+struct at91sam9_smc_generic_fields {
+ struct regmap_field *setup;
+ struct regmap_field *pulse;
+ struct regmap_field *cycle;
+ struct regmap_field *mode;
+};
+
+struct at91sam9_ebi_dev_config {
+ struct at91sam9_smc_timings timings;
+ u32 mode;
+};
+
+struct at91_ebi_dev_config {
+ int cs;
+ union {
+ struct at91sam9_ebi_dev_config sam9;
+ };
+};
+
+struct at91_ebi;
+
+struct at91_ebi_dev {
+ struct list_head node;
+ struct at91_ebi *ebi;
+ u32 mode;
+ int numcs;
+ struct at91_ebi_dev_config configs[];
+};
+
+struct at91_ebi_caps {
+ unsigned int available_cs;
+ const struct reg_field *ebi_csa;
+ void (*get_config)(struct at91_ebi_dev *ebid,
+ struct at91_ebi_dev_config *conf);
+ int (*xlate_config)(struct at91_ebi_dev *ebid,
+ struct device_node *configs_np,
+ struct at91_ebi_dev_config *conf);
+ int (*apply_config)(struct at91_ebi_dev *ebid,
+ struct at91_ebi_dev_config *conf);
+ int (*init)(struct at91_ebi *ebi);
+};
+
+struct at91_ebi {
+ struct clk *clk;
+ struct regmap *smc;
+ struct regmap *matrix;
+
+ struct regmap_field *ebi_csa;
+
+ struct device *dev;
+ const struct at91_ebi_caps *caps;
+ struct list_head devs;
+ union {
+ struct at91sam9_smc_generic_fields sam9;
+ };
+};
+
+static void at91sam9_ebi_get_config(struct at91_ebi_dev *ebid,
+ struct at91_ebi_dev_config *conf)
+{
+ struct at91sam9_smc_generic_fields *fields = &ebid->ebi->sam9;
+ unsigned int clk_rate = clk_get_rate(ebid->ebi->clk);
+ struct at91sam9_ebi_dev_config *config = &conf->sam9;
+ struct at91sam9_smc_timings *timings = &config->timings;
+ unsigned int val;
+
+ regmap_fields_read(fields->mode, conf->cs, &val);
+ config->mode = val & ~AT91_SMC_TDF;
+
+ val = (val & AT91_SMC_TDF) >> 16;
+ timings->tdf_ns = clk_rate * val;
+
+ regmap_fields_read(fields->setup, conf->cs, &val);
+ timings->ncs_rd_setup_ns = (val >> 24) & 0x1f;
+ timings->ncs_rd_setup_ns += ((val >> 29) & 0x1) * 128;
+ timings->ncs_rd_setup_ns *= clk_rate;
+ timings->nrd_setup_ns = (val >> 16) & 0x1f;
+ timings->nrd_setup_ns += ((val >> 21) & 0x1) * 128;
+ timings->nrd_setup_ns *= clk_rate;
+ timings->ncs_wr_setup_ns = (val >> 8) & 0x1f;
+ timings->ncs_wr_setup_ns += ((val >> 13) & 0x1) * 128;
+ timings->ncs_wr_setup_ns *= clk_rate;
+ timings->nwe_setup_ns = val & 0x1f;
+ timings->nwe_setup_ns += ((val >> 5) & 0x1) * 128;
+ timings->nwe_setup_ns *= clk_rate;
+
+ regmap_fields_read(fields->pulse, conf->cs, &val);
+ timings->ncs_rd_pulse_ns = (val >> 24) & 0x3f;
+ timings->ncs_rd_pulse_ns += ((val >> 30) & 0x1) * 256;
+ timings->ncs_rd_pulse_ns *= clk_rate;
+ timings->nrd_pulse_ns = (val >> 16) & 0x3f;
+ timings->nrd_pulse_ns += ((val >> 22) & 0x1) * 256;
+ timings->nrd_pulse_ns *= clk_rate;
+ timings->ncs_wr_pulse_ns = (val >> 8) & 0x3f;
+ timings->ncs_wr_pulse_ns += ((val >> 14) & 0x1) * 256;
+ timings->ncs_wr_pulse_ns *= clk_rate;
+ timings->nwe_pulse_ns = val & 0x3f;
+ timings->nwe_pulse_ns += ((val >> 6) & 0x1) * 256;
+ timings->nwe_pulse_ns *= clk_rate;
+
+ regmap_fields_read(fields->cycle, conf->cs, &val);
+ timings->nrd_cycle_ns = (val >> 16) & 0x7f;
+ timings->nrd_cycle_ns += ((val >> 23) & 0x3) * 256;
+ timings->nrd_cycle_ns *= clk_rate;
+ timings->nwe_cycle_ns = val & 0x7f;
+ timings->nwe_cycle_ns += ((val >> 7) & 0x3) * 256;
+ timings->nwe_cycle_ns *= clk_rate;
+}
+
+static int at91_xlate_timing(struct device_node *np, const char *prop,
+ u32 *val, bool *required)
+{
+ if (!of_property_read_u32(np, prop, val)) {
+ *required = true;
+ return 0;
+ }
+
+ if (*required)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int at91sam9_smc_xslate_timings(struct at91_ebi_dev *ebid,
+ struct device_node *np,
+ struct at91sam9_smc_timings *timings,
+ bool *required)
+{
+ int ret;
+
+ ret = at91_xlate_timing(np, "atmel,smc-ncs-rd-setup-ns",
+ &timings->ncs_rd_setup_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nrd-setup-ns",
+ &timings->nrd_setup_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-ncs-wr-setup-ns",
+ &timings->ncs_wr_setup_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nwe-setup-ns",
+ &timings->nwe_setup_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-ncs-rd-pulse-ns",
+ &timings->ncs_rd_pulse_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nrd-pulse-ns",
+ &timings->nrd_pulse_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-ncs-wr-pulse-ns",
+ &timings->ncs_wr_pulse_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nwe-pulse-ns",
+ &timings->nwe_pulse_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nwe-cycle-ns",
+ &timings->nwe_cycle_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-nrd-cycle-ns",
+ &timings->nrd_cycle_ns, required);
+ if (ret)
+ goto out;
+
+ ret = at91_xlate_timing(np, "atmel,smc-tdf-ns",
+ &timings->tdf_ns, required);
+
+out:
+ if (ret)
+ dev_err(ebid->ebi->dev,
+ "missing or invalid timings definition in %s",
+ np->full_name);
+
+ return ret;
+}
+
+static int at91sam9_ebi_xslate_config(struct at91_ebi_dev *ebid,
+ struct device_node *np,
+ struct at91_ebi_dev_config *conf)
+{
+ struct at91sam9_ebi_dev_config *config = &conf->sam9;
+ bool required = false;
+ const char *tmp_str;
+ u32 tmp;
+ int ret;
+
+ ret = of_property_read_u32(np, "atmel,smc-bus-width", &tmp);
+ if (!ret) {
+ switch (tmp) {
+ case 8:
+ config->mode |= AT91_SMC_DBW_8;
+ break;
+
+ case 16:
+ config->mode |= AT91_SMC_DBW_16;
+ break;
+
+ case 32:
+ config->mode |= AT91_SMC_DBW_32;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ required = true;
+ }
+
+ if (of_property_read_bool(np, "atmel,smc-tdf-optimized")) {
+ config->mode |= AT91_SMC_TDFMODE_OPTIMIZED;
+ required = true;
+ }
+
+ tmp_str = NULL;
+ of_property_read_string(np, "atmel,smc-byte-access-type", &tmp_str);
+ if (tmp_str && !strcmp(tmp_str, "write")) {
+ config->mode |= AT91_SMC_BAT_WRITE;
+ required = true;
+ }
+
+ tmp_str = NULL;
+ of_property_read_string(np, "atmel,smc-read-mode", &tmp_str);
+ if (tmp_str && !strcmp(tmp_str, "nrd")) {
+ config->mode |= AT91_SMC_READMODE_NRD;
+ required = true;
+ }
+
+ tmp_str = NULL;
+ of_property_read_string(np, "atmel,smc-write-mode", &tmp_str);
+ if (tmp_str && !strcmp(tmp_str, "nwe")) {
+ config->mode |= AT91_SMC_WRITEMODE_NWE;
+ required = true;
+ }
+
+ tmp_str = NULL;
+ of_property_read_string(np, "atmel,smc-exnw-mode", &tmp_str);
+ if (tmp_str) {
+ if (!strcmp(tmp_str, "frozen"))
+ config->mode |= AT91_SMC_EXNWMODE_FROZEN;
+ else if (!strcmp(tmp_str, "ready"))
+ config->mode |= AT91_SMC_EXNWMODE_READY;
+ else if (strcmp(tmp_str, "disabled"))
+ return -EINVAL;
+
+ required = true;
+ }
+
+ ret = of_property_read_u32(np, "atmel,smc-page-mode", &tmp);
+ if (!ret) {
+ switch (tmp) {
+ case 4:
+ config->mode |= AT91_SMC_PS_4;
+ break;
+
+ case 8:
+ config->mode |= AT91_SMC_PS_8;
+ break;
+
+ case 16:
+ config->mode |= AT91_SMC_PS_16;
+ break;
+
+ case 32:
+ config->mode |= AT91_SMC_PS_32;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ config->mode |= AT91_SMC_PMEN;
+ required = true;
+ }
+
+ ret = at91sam9_smc_xslate_timings(ebid, np, &config->timings,
+ &required);
+ if (ret)
+ return ret;
+
+ return required;
+}
+
+static int at91sam9_ebi_apply_config(struct at91_ebi_dev *ebid,
+ struct at91_ebi_dev_config *conf)
+{
+ unsigned int clk_rate = clk_get_rate(ebid->ebi->clk);
+ struct at91sam9_ebi_dev_config *config = &conf->sam9;
+ struct at91sam9_smc_timings *timings = &config->timings;
+ struct at91sam9_smc_generic_fields *fields = &ebid->ebi->sam9;
+ u32 coded_val;
+ u32 val;
+
+ coded_val = at91sam9_smc_setup_ns_to_cycles(clk_rate,
+ timings->ncs_rd_setup_ns);
+ val = AT91SAM9_SMC_NCS_NRDSETUP(coded_val);
+ coded_val = at91sam9_smc_setup_ns_to_cycles(clk_rate,
+ timings->nrd_setup_ns);
+ val |= AT91SAM9_SMC_NRDSETUP(coded_val);
+ coded_val = at91sam9_smc_setup_ns_to_cycles(clk_rate,
+ timings->ncs_wr_setup_ns);
+ val |= AT91SAM9_SMC_NCS_WRSETUP(coded_val);
+ coded_val = at91sam9_smc_setup_ns_to_cycles(clk_rate,
+ timings->nwe_setup_ns);
+ val |= AT91SAM9_SMC_NWESETUP(coded_val);
+ regmap_fields_write(fields->setup, conf->cs, val);
+
+ coded_val = at91sam9_smc_pulse_ns_to_cycles(clk_rate,
+ timings->ncs_rd_pulse_ns);
+ val = AT91SAM9_SMC_NCS_NRDPULSE(coded_val);
+ coded_val = at91sam9_smc_pulse_ns_to_cycles(clk_rate,
+ timings->nrd_pulse_ns);
+ val |= AT91SAM9_SMC_NRDPULSE(coded_val);
+ coded_val = at91sam9_smc_pulse_ns_to_cycles(clk_rate,
+ timings->ncs_wr_pulse_ns);
+ val |= AT91SAM9_SMC_NCS_WRPULSE(coded_val);
+ coded_val = at91sam9_smc_pulse_ns_to_cycles(clk_rate,
+ timings->nwe_pulse_ns);
+ val |= AT91SAM9_SMC_NWEPULSE(coded_val);
+ regmap_fields_write(fields->pulse, conf->cs, val);
+
+ coded_val = at91sam9_smc_cycle_ns_to_cycles(clk_rate,
+ timings->nrd_cycle_ns);
+ val = AT91SAM9_SMC_NRDCYCLE(coded_val);
+ coded_val = at91sam9_smc_cycle_ns_to_cycles(clk_rate,
+ timings->nwe_cycle_ns);
+ val |= AT91SAM9_SMC_NWECYCLE(coded_val);
+ regmap_fields_write(fields->cycle, conf->cs, val);
+
+ val = DIV_ROUND_UP(timings->tdf_ns, clk_rate);
+ if (val > AT91_SMC_TDF_MAX)
+ val = AT91_SMC_TDF_MAX;
+ regmap_fields_write(fields->mode, conf->cs,
+ config->mode | AT91_SMC_TDF_(val));
+
+ return 0;
+}
+
+static int at91sam9_ebi_init(struct at91_ebi *ebi)
+{
+ struct at91sam9_smc_generic_fields *fields = &ebi->sam9;
+ struct reg_field field = REG_FIELD(0, 0, 31);
+
+ field.id_size = fls(ebi->caps->available_cs);
+ field.id_offset = AT91SAM9_SMC_GENERIC_BLK_SZ;
+
+ field.reg = AT91SAM9_SMC_SETUP(AT91SAM9_SMC_GENERIC);
+ fields->setup = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->setup))
+ return PTR_ERR(fields->setup);
+
+ field.reg = AT91SAM9_SMC_PULSE(AT91SAM9_SMC_GENERIC);
+ fields->pulse = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->pulse))
+ return PTR_ERR(fields->pulse);
+
+ field.reg = AT91SAM9_SMC_CYCLE(AT91SAM9_SMC_GENERIC);
+ fields->cycle = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->cycle))
+ return PTR_ERR(fields->cycle);
+
+ field.reg = AT91SAM9_SMC_MODE(AT91SAM9_SMC_GENERIC);
+ fields->mode = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->mode))
+ return PTR_ERR(fields->mode);
+
+ return 0;
+}
+
+static int sama5d3_ebi_init(struct at91_ebi *ebi)
+{
+ struct at91sam9_smc_generic_fields *fields = &ebi->sam9;
+ struct reg_field field = REG_FIELD(0, 0, 31);
+
+ field.id_size = fls(ebi->caps->available_cs);
+ field.id_offset = SAMA5_SMC_GENERIC_BLK_SZ;
+
+ field.reg = AT91SAM9_SMC_SETUP(SAMA5_SMC_GENERIC);
+ fields->setup = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->setup))
+ return PTR_ERR(fields->setup);
+
+ field.reg = AT91SAM9_SMC_PULSE(SAMA5_SMC_GENERIC);
+ fields->pulse = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->pulse))
+ return PTR_ERR(fields->pulse);
+
+ field.reg = AT91SAM9_SMC_CYCLE(SAMA5_SMC_GENERIC);
+ fields->cycle = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->cycle))
+ return PTR_ERR(fields->cycle);
+
+ field.reg = SAMA5_SMC_MODE(SAMA5_SMC_GENERIC);
+ fields->mode = devm_regmap_field_alloc(ebi->dev, ebi->smc, field);
+ if (IS_ERR(fields->mode))
+ return PTR_ERR(fields->mode);
+
+ return 0;
+}
+
+static int at91_ebi_dev_setup(struct at91_ebi *ebi, struct device_node *np,
+ int reg_cells)
+{
+ const struct at91_ebi_caps *caps = ebi->caps;
+ struct at91_ebi_dev_config conf = { };
+ struct device *dev = ebi->dev;
+ struct at91_ebi_dev *ebid;
+ int ret, numcs = 0, i;
+ bool apply = false;
+
+ numcs = of_property_count_elems_of_size(np, "reg",
+ reg_cells * sizeof(u32));
+ if (numcs <= 0) {
+ dev_err(dev, "invalid reg property in %s\n", np->full_name);
+ return -EINVAL;
+ }
+
+ ebid = devm_kzalloc(ebi->dev,
+ sizeof(*ebid) + (numcs * sizeof(*ebid->configs)),
+ GFP_KERNEL);
+ if (!ebid)
+ return -ENOMEM;
+
+ ebid->ebi = ebi;
+
+ ret = caps->xlate_config(ebid, np, &conf);
+ if (ret < 0)
+ return ret;
+ else if (ret)
+ apply = true;
+
+ for (i = 0; i < numcs; i++) {
+ u32 cs;
+
+ ret = of_property_read_u32_index(np, "reg", i * reg_cells,
+ &cs);
+ if (ret)
+ return ret;
+
+ if (cs > AT91_MATRIX_EBI_NUM_CS ||
+ !(ebi->caps->available_cs & BIT(cs))) {
+ dev_err(dev, "invalid reg property in %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+
+ ebid->configs[i].cs = cs;
+
+ if (apply) {
+ conf.cs = cs;
+ ret = caps->apply_config(ebid, &conf);
+ if (ret)
+ return ret;
+ }
+
+ caps->get_config(ebid, &ebid->configs[i]);
+
+ /*
+ * Attach the EBI device to the generic SMC logic if at least
+ * one "atmel,smc-" property is present.
+ */
+ if (ebi->ebi_csa && ret)
+ regmap_field_update_bits(ebi->ebi_csa,
+ BIT(cs), 0);
+ }
+
+ list_add_tail(&ebid->node, &ebi->devs);
+
+ return 0;
+}
+
+static const struct reg_field at91sam9260_ebi_csa =
+ REG_FIELD(AT91SAM9260_MATRIX_EBICSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9260_ebi_caps = {
+ .available_cs = 0xff,
+ .ebi_csa = &at91sam9260_ebi_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct reg_field at91sam9261_ebi_csa =
+ REG_FIELD(AT91SAM9261_MATRIX_EBICSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9261_ebi_caps = {
+ .available_cs = 0xff,
+ .ebi_csa = &at91sam9261_ebi_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct reg_field at91sam9263_ebi0_csa =
+ REG_FIELD(AT91SAM9263_MATRIX_EBI0CSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9263_ebi0_caps = {
+ .available_cs = 0x3f,
+ .ebi_csa = &at91sam9263_ebi0_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct reg_field at91sam9263_ebi1_csa =
+ REG_FIELD(AT91SAM9263_MATRIX_EBI1CSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9263_ebi1_caps = {
+ .available_cs = 0x7,
+ .ebi_csa = &at91sam9263_ebi1_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct reg_field at91sam9rl_ebi_csa =
+ REG_FIELD(AT91SAM9RL_MATRIX_EBICSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9rl_ebi_caps = {
+ .available_cs = 0x3f,
+ .ebi_csa = &at91sam9rl_ebi_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct reg_field at91sam9g45_ebi_csa =
+ REG_FIELD(AT91SAM9G45_MATRIX_EBICSA, 0,
+ AT91_MATRIX_EBI_NUM_CS - 1);
+
+static const struct at91_ebi_caps at91sam9g45_ebi_caps = {
+ .available_cs = 0x3f,
+ .ebi_csa = &at91sam9g45_ebi_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct at91_ebi_caps at91sam9x5_ebi_caps = {
+ .available_cs = 0x3f,
+ .ebi_csa = &at91sam9263_ebi0_csa,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = at91sam9_ebi_init,
+};
+
+static const struct at91_ebi_caps sama5d3_ebi_caps = {
+ .available_cs = 0xf,
+ .get_config = at91sam9_ebi_get_config,
+ .xlate_config = at91sam9_ebi_xslate_config,
+ .apply_config = at91sam9_ebi_apply_config,
+ .init = sama5d3_ebi_init,
+};
+
+static const struct of_device_id at91_ebi_id_table[] = {
+ {
+ .compatible = "atmel,at91sam9260-ebi",
+ .data = &at91sam9260_ebi_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9261-ebi",
+ .data = &at91sam9261_ebi_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9263-ebi0",
+ .data = &at91sam9263_ebi0_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9263-ebi1",
+ .data = &at91sam9263_ebi1_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9rl-ebi",
+ .data = &at91sam9rl_ebi_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9g45-ebi",
+ .data = &at91sam9g45_ebi_caps,
+ },
+ {
+ .compatible = "atmel,at91sam9x5-ebi",
+ .data = &at91sam9x5_ebi_caps,
+ },
+ {
+ .compatible = "atmel,sama5d3-ebi",
+ .data = &sama5d3_ebi_caps,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, at91_ebi_id_table);
+
+static int at91_ebi_dev_disable(struct at91_ebi *ebi, struct device_node *np)
+{
+ struct device *dev = ebi->dev;
+ struct property *newprop;
+
+ newprop = devm_kzalloc(dev, sizeof(*newprop), GFP_KERNEL);
+ if (!newprop)
+ return -ENOMEM;
+
+ newprop->name = devm_kstrdup(dev, "status", GFP_KERNEL);
+ if (!newprop->name)
+ return -ENOMEM;
+
+ newprop->value = devm_kstrdup(dev, "disabled", GFP_KERNEL);
+ if (!newprop->name)
+ return -ENOMEM;
+
+ newprop->length = sizeof("disabled");
+
+ return of_update_property(np, newprop);
+}
+
+static int at91_ebi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *child, *np = dev->of_node;
+ const struct of_device_id *match;
+ struct at91_ebi *ebi;
+ int ret, reg_cells;
+ struct clk *clk;
+ u32 val;
+
+ match = of_match_device(at91_ebi_id_table, dev);
+ if (!match || !match->data)
+ return -EINVAL;
+
+ ebi = devm_kzalloc(dev, sizeof(*ebi), GFP_KERNEL);
+ if (!ebi)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ebi->devs);
+ ebi->caps = match->data;
+ ebi->dev = dev;
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ ebi->clk = clk;
+
+ ebi->smc = syscon_regmap_lookup_by_phandle(np, "atmel,smc");
+ if (IS_ERR(ebi->smc))
+ return PTR_ERR(ebi->smc);
+
+ /*
+ * The sama5d3 does not provide an EBICSA register and thus does need
+ * to access the matrix registers.
+ */
+ if (ebi->caps->ebi_csa) {
+ ebi->matrix =
+ syscon_regmap_lookup_by_phandle(np, "atmel,matrix");
+ if (IS_ERR(ebi->matrix))
+ return PTR_ERR(ebi->matrix);
+
+ ebi->ebi_csa = regmap_field_alloc(ebi->matrix,
+ *ebi->caps->ebi_csa);
+ if (IS_ERR(ebi->ebi_csa))
+ return PTR_ERR(ebi->ebi_csa);
+ }
+
+ ret = ebi->caps->init(ebi);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(np, "#address-cells", &val);
+ if (ret) {
+ dev_err(dev, "missing #address-cells property\n");
+ return ret;
+ }
+
+ reg_cells = val;
+
+ ret = of_property_read_u32(np, "#size-cells", &val);
+ if (ret) {
+ dev_err(dev, "missing #address-cells property\n");
+ return ret;
+ }
+
+ reg_cells += val;
+
+ for_each_available_child_of_node(np, child) {
+ if (!of_find_property(child, "reg", NULL))
+ continue;
+
+ ret = at91_ebi_dev_setup(ebi, child, reg_cells);
+ if (ret) {
+ dev_err(dev, "failed to configure EBI bus for %s, disabling the device",
+ child->full_name);
+
+ ret = at91_ebi_dev_disable(ebi, child);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return of_platform_populate(np, NULL, NULL, dev);
+}
+
+static struct platform_driver at91_ebi_driver = {
+ .driver = {
+ .name = "atmel-ebi",
+ .of_match_table = at91_ebi_id_table,
+ },
+};
+module_platform_driver_probe(at91_ebi_driver, at91_ebi_probe);
+
+MODULE_AUTHOR("JJ Hiblot");
+MODULE_DESCRIPTION("Atmel EBI driver");
+MODULE_LICENSE("GPL");
--
2.7.4