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2f9dc6a357
Early exits from for_each_available_child_of_node() should decrement the
node reference counter. Reported by Coccinelle:
drivers/memory/stm32-fmc2-ebi.c:1046:1-33: WARNING:
Function "for_each_available_child_of_node" should have of_node_put() before return around line 1051.
Fixes: 66b8173a19
("memory: stm32-fmc2-ebi: add STM32 FMC2 EBI controller driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Christophe Kerello <christophe.kerello@foss.st.com>
Link: https://lore.kernel.org/r/20210423101815.119341-1-krzysztof.kozlowski@canonical.com
1211 lines
30 KiB
C
1211 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) STMicroelectronics 2020
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*/
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#include <linux/bitfield.h>
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#include <linux/clk.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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/* FMC2 Controller Registers */
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#define FMC2_BCR1 0x0
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#define FMC2_BTR1 0x4
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#define FMC2_BCR(x) ((x) * 0x8 + FMC2_BCR1)
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#define FMC2_BTR(x) ((x) * 0x8 + FMC2_BTR1)
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#define FMC2_PCSCNTR 0x20
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#define FMC2_BWTR1 0x104
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#define FMC2_BWTR(x) ((x) * 0x8 + FMC2_BWTR1)
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/* Register: FMC2_BCR1 */
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#define FMC2_BCR1_CCLKEN BIT(20)
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#define FMC2_BCR1_FMC2EN BIT(31)
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/* Register: FMC2_BCRx */
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#define FMC2_BCR_MBKEN BIT(0)
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#define FMC2_BCR_MUXEN BIT(1)
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#define FMC2_BCR_MTYP GENMASK(3, 2)
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#define FMC2_BCR_MWID GENMASK(5, 4)
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#define FMC2_BCR_FACCEN BIT(6)
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#define FMC2_BCR_BURSTEN BIT(8)
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#define FMC2_BCR_WAITPOL BIT(9)
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#define FMC2_BCR_WAITCFG BIT(11)
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#define FMC2_BCR_WREN BIT(12)
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#define FMC2_BCR_WAITEN BIT(13)
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#define FMC2_BCR_EXTMOD BIT(14)
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#define FMC2_BCR_ASYNCWAIT BIT(15)
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#define FMC2_BCR_CPSIZE GENMASK(18, 16)
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#define FMC2_BCR_CBURSTRW BIT(19)
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#define FMC2_BCR_NBLSET GENMASK(23, 22)
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/* Register: FMC2_BTRx/FMC2_BWTRx */
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#define FMC2_BXTR_ADDSET GENMASK(3, 0)
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#define FMC2_BXTR_ADDHLD GENMASK(7, 4)
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#define FMC2_BXTR_DATAST GENMASK(15, 8)
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#define FMC2_BXTR_BUSTURN GENMASK(19, 16)
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#define FMC2_BTR_CLKDIV GENMASK(23, 20)
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#define FMC2_BTR_DATLAT GENMASK(27, 24)
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#define FMC2_BXTR_ACCMOD GENMASK(29, 28)
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#define FMC2_BXTR_DATAHLD GENMASK(31, 30)
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/* Register: FMC2_PCSCNTR */
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#define FMC2_PCSCNTR_CSCOUNT GENMASK(15, 0)
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#define FMC2_PCSCNTR_CNTBEN(x) BIT((x) + 16)
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#define FMC2_MAX_EBI_CE 4
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#define FMC2_MAX_BANKS 5
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#define FMC2_BCR_CPSIZE_0 0x0
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#define FMC2_BCR_CPSIZE_128 0x1
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#define FMC2_BCR_CPSIZE_256 0x2
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#define FMC2_BCR_CPSIZE_512 0x3
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#define FMC2_BCR_CPSIZE_1024 0x4
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#define FMC2_BCR_MWID_8 0x0
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#define FMC2_BCR_MWID_16 0x1
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#define FMC2_BCR_MTYP_SRAM 0x0
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#define FMC2_BCR_MTYP_PSRAM 0x1
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#define FMC2_BCR_MTYP_NOR 0x2
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#define FMC2_BXTR_EXTMOD_A 0x0
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#define FMC2_BXTR_EXTMOD_B 0x1
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#define FMC2_BXTR_EXTMOD_C 0x2
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#define FMC2_BXTR_EXTMOD_D 0x3
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#define FMC2_BCR_NBLSET_MAX 0x3
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#define FMC2_BXTR_ADDSET_MAX 0xf
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#define FMC2_BXTR_ADDHLD_MAX 0xf
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#define FMC2_BXTR_DATAST_MAX 0xff
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#define FMC2_BXTR_BUSTURN_MAX 0xf
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#define FMC2_BXTR_DATAHLD_MAX 0x3
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#define FMC2_BTR_CLKDIV_MAX 0xf
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#define FMC2_BTR_DATLAT_MAX 0xf
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#define FMC2_PCSCNTR_CSCOUNT_MAX 0xff
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enum stm32_fmc2_ebi_bank {
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FMC2_EBI1 = 0,
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FMC2_EBI2,
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FMC2_EBI3,
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FMC2_EBI4,
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FMC2_NAND
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};
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enum stm32_fmc2_ebi_register_type {
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FMC2_REG_BCR = 1,
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FMC2_REG_BTR,
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FMC2_REG_BWTR,
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FMC2_REG_PCSCNTR
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};
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enum stm32_fmc2_ebi_transaction_type {
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FMC2_ASYNC_MODE_1_SRAM = 0,
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FMC2_ASYNC_MODE_1_PSRAM,
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FMC2_ASYNC_MODE_A_SRAM,
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FMC2_ASYNC_MODE_A_PSRAM,
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FMC2_ASYNC_MODE_2_NOR,
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FMC2_ASYNC_MODE_B_NOR,
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FMC2_ASYNC_MODE_C_NOR,
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FMC2_ASYNC_MODE_D_NOR,
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FMC2_SYNC_READ_SYNC_WRITE_PSRAM,
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FMC2_SYNC_READ_ASYNC_WRITE_PSRAM,
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FMC2_SYNC_READ_SYNC_WRITE_NOR,
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FMC2_SYNC_READ_ASYNC_WRITE_NOR
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};
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enum stm32_fmc2_ebi_buswidth {
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FMC2_BUSWIDTH_8 = 8,
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FMC2_BUSWIDTH_16 = 16
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};
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enum stm32_fmc2_ebi_cpsize {
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FMC2_CPSIZE_0 = 0,
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FMC2_CPSIZE_128 = 128,
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FMC2_CPSIZE_256 = 256,
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FMC2_CPSIZE_512 = 512,
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FMC2_CPSIZE_1024 = 1024
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};
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struct stm32_fmc2_ebi {
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struct device *dev;
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struct clk *clk;
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struct regmap *regmap;
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u8 bank_assigned;
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u32 bcr[FMC2_MAX_EBI_CE];
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u32 btr[FMC2_MAX_EBI_CE];
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u32 bwtr[FMC2_MAX_EBI_CE];
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u32 pcscntr;
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};
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/*
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* struct stm32_fmc2_prop - STM32 FMC2 EBI property
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* @name: the device tree binding name of the property
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* @bprop: indicate that it is a boolean property
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* @mprop: indicate that it is a mandatory property
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* @reg_type: the register that have to be modified
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* @reg_mask: the bit that have to be modified in the selected register
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* in case of it is a boolean property
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* @reset_val: the default value that have to be set in case the property
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* has not been defined in the device tree
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* @check: this callback ckecks that the property is compliant with the
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* transaction type selected
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* @calculate: this callback is called to calculate for exemple a timing
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* set in nanoseconds in the device tree in clock cycles or in
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* clock period
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* @set: this callback applies the values in the registers
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*/
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struct stm32_fmc2_prop {
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const char *name;
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bool bprop;
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bool mprop;
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int reg_type;
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u32 reg_mask;
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u32 reset_val;
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int (*check)(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop, int cs);
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u32 (*calculate)(struct stm32_fmc2_ebi *ebi, int cs, u32 setup);
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int (*set)(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs, u32 setup);
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};
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static int stm32_fmc2_ebi_check_mux(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr;
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if (bcr & FMC2_BCR_MTYP)
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_waitcfg(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_sync_trans(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr;
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if (bcr & FMC2_BCR_BURSTEN)
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_async_trans(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr;
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if (!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW))
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_cpsize(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_address_hold(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr, bxtr, val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if (prop->reg_type == FMC2_REG_BWTR)
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regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
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else
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regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
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if ((!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW)) &&
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((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN))
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_clk_period(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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u32 bcr, bcr1;
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regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
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if (cs)
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regmap_read(ebi->regmap, FMC2_BCR1, &bcr1);
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else
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bcr1 = bcr;
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if (bcr & FMC2_BCR_BURSTEN && (!cs || !(bcr1 & FMC2_BCR1_CCLKEN)))
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return 0;
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return -EINVAL;
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}
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static int stm32_fmc2_ebi_check_cclk(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs)
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{
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if (cs)
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return -EINVAL;
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return stm32_fmc2_ebi_check_sync_trans(ebi, prop, cs);
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}
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static u32 stm32_fmc2_ebi_ns_to_clock_cycles(struct stm32_fmc2_ebi *ebi,
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int cs, u32 setup)
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{
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unsigned long hclk = clk_get_rate(ebi->clk);
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unsigned long hclkp = NSEC_PER_SEC / (hclk / 1000);
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return DIV_ROUND_UP(setup * 1000, hclkp);
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}
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static u32 stm32_fmc2_ebi_ns_to_clk_period(struct stm32_fmc2_ebi *ebi,
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int cs, u32 setup)
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{
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u32 nb_clk_cycles = stm32_fmc2_ebi_ns_to_clock_cycles(ebi, cs, setup);
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u32 bcr, btr, clk_period;
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regmap_read(ebi->regmap, FMC2_BCR1, &bcr);
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if (bcr & FMC2_BCR1_CCLKEN || !cs)
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regmap_read(ebi->regmap, FMC2_BTR1, &btr);
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else
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regmap_read(ebi->regmap, FMC2_BTR(cs), &btr);
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clk_period = FIELD_GET(FMC2_BTR_CLKDIV, btr) + 1;
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return DIV_ROUND_UP(nb_clk_cycles, clk_period);
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}
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static int stm32_fmc2_ebi_get_reg(int reg_type, int cs, u32 *reg)
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{
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switch (reg_type) {
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case FMC2_REG_BCR:
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*reg = FMC2_BCR(cs);
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break;
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case FMC2_REG_BTR:
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*reg = FMC2_BTR(cs);
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break;
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case FMC2_REG_BWTR:
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*reg = FMC2_BWTR(cs);
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break;
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case FMC2_REG_PCSCNTR:
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*reg = FMC2_PCSCNTR;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int stm32_fmc2_ebi_set_bit_field(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs, u32 setup)
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{
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u32 reg;
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int ret;
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ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
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if (ret)
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return ret;
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regmap_update_bits(ebi->regmap, reg, prop->reg_mask,
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setup ? prop->reg_mask : 0);
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return 0;
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}
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static int stm32_fmc2_ebi_set_trans_type(struct stm32_fmc2_ebi *ebi,
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const struct stm32_fmc2_prop *prop,
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int cs, u32 setup)
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{
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u32 bcr_mask, bcr = FMC2_BCR_WREN;
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u32 btr_mask, btr = 0;
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u32 bwtr_mask, bwtr = 0;
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bwtr_mask = FMC2_BXTR_ACCMOD;
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btr_mask = FMC2_BXTR_ACCMOD;
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bcr_mask = FMC2_BCR_MUXEN | FMC2_BCR_MTYP | FMC2_BCR_FACCEN |
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FMC2_BCR_WREN | FMC2_BCR_WAITEN | FMC2_BCR_BURSTEN |
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FMC2_BCR_EXTMOD | FMC2_BCR_CBURSTRW;
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switch (setup) {
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case FMC2_ASYNC_MODE_1_SRAM:
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bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
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/*
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* MUXEN = 0, MTYP = 0, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
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* WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
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*/
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break;
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case FMC2_ASYNC_MODE_1_PSRAM:
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/*
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* MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
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* WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
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*/
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bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
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break;
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case FMC2_ASYNC_MODE_A_SRAM:
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/*
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* MUXEN = 0, MTYP = 0, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
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* WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 0
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*/
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bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
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bcr |= FMC2_BCR_EXTMOD;
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btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
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bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
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break;
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case FMC2_ASYNC_MODE_A_PSRAM:
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/*
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* MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
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* WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 0
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*/
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bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
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bcr |= FMC2_BCR_EXTMOD;
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btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
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bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
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break;
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case FMC2_ASYNC_MODE_2_NOR:
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/*
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* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
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* WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
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*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN;
|
|
break;
|
|
case FMC2_ASYNC_MODE_B_NOR:
|
|
/*
|
|
* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 1
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
|
|
btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
|
|
bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
|
|
break;
|
|
case FMC2_ASYNC_MODE_C_NOR:
|
|
/*
|
|
* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 2
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
|
|
btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
|
|
bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
|
|
break;
|
|
case FMC2_ASYNC_MODE_D_NOR:
|
|
/*
|
|
* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 3
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
|
|
btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
|
|
bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
|
|
break;
|
|
case FMC2_SYNC_READ_SYNC_WRITE_PSRAM:
|
|
/*
|
|
* MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 1, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 0, CBURSTRW = 1, ACCMOD = 0
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
|
|
bcr |= FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
|
|
break;
|
|
case FMC2_SYNC_READ_ASYNC_WRITE_PSRAM:
|
|
/*
|
|
* MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 1, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
|
|
bcr |= FMC2_BCR_BURSTEN;
|
|
break;
|
|
case FMC2_SYNC_READ_SYNC_WRITE_NOR:
|
|
/*
|
|
* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 1, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 0, CBURSTRW = 1, ACCMOD = 0
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
|
|
break;
|
|
case FMC2_SYNC_READ_ASYNC_WRITE_NOR:
|
|
/*
|
|
* MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 1, WAITEN = 0,
|
|
* WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
|
|
*/
|
|
bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
|
|
bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN;
|
|
break;
|
|
default:
|
|
/* Type of transaction not supported */
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (bcr & FMC2_BCR_EXTMOD)
|
|
regmap_update_bits(ebi->regmap, FMC2_BWTR(cs),
|
|
bwtr_mask, bwtr);
|
|
regmap_update_bits(ebi->regmap, FMC2_BTR(cs), btr_mask, btr);
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs), bcr_mask, bcr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_buswidth(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val;
|
|
|
|
switch (setup) {
|
|
case FMC2_BUSWIDTH_8:
|
|
val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_8);
|
|
break;
|
|
case FMC2_BUSWIDTH_16:
|
|
val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_16);
|
|
break;
|
|
default:
|
|
/* Buswidth not supported */
|
|
return -EINVAL;
|
|
}
|
|
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MWID, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_cpsize(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val;
|
|
|
|
switch (setup) {
|
|
case FMC2_CPSIZE_0:
|
|
val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_0);
|
|
break;
|
|
case FMC2_CPSIZE_128:
|
|
val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_128);
|
|
break;
|
|
case FMC2_CPSIZE_256:
|
|
val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_256);
|
|
break;
|
|
case FMC2_CPSIZE_512:
|
|
val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_512);
|
|
break;
|
|
case FMC2_CPSIZE_1024:
|
|
val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_1024);
|
|
break;
|
|
default:
|
|
/* Cpsize not supported */
|
|
return -EINVAL;
|
|
}
|
|
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_CPSIZE, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_bl_setup(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val;
|
|
|
|
val = min_t(u32, setup, FMC2_BCR_NBLSET_MAX);
|
|
val = FIELD_PREP(FMC2_BCR_NBLSET, val);
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_NBLSET, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_address_setup(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 bcr, bxtr, reg;
|
|
u32 val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
|
|
int ret;
|
|
|
|
ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
|
|
if (prop->reg_type == FMC2_REG_BWTR)
|
|
regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
|
|
else
|
|
regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
|
|
|
|
if ((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN)
|
|
val = clamp_val(setup, 1, FMC2_BXTR_ADDSET_MAX);
|
|
else
|
|
val = min_t(u32, setup, FMC2_BXTR_ADDSET_MAX);
|
|
val = FIELD_PREP(FMC2_BXTR_ADDSET, val);
|
|
regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDSET, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_address_hold(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val, reg;
|
|
int ret;
|
|
|
|
ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = clamp_val(setup, 1, FMC2_BXTR_ADDHLD_MAX);
|
|
val = FIELD_PREP(FMC2_BXTR_ADDHLD, val);
|
|
regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDHLD, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_data_setup(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val, reg;
|
|
int ret;
|
|
|
|
ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = clamp_val(setup, 1, FMC2_BXTR_DATAST_MAX);
|
|
val = FIELD_PREP(FMC2_BXTR_DATAST, val);
|
|
regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAST, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_bus_turnaround(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val, reg;
|
|
int ret;
|
|
|
|
ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = setup ? min_t(u32, setup - 1, FMC2_BXTR_BUSTURN_MAX) : 0;
|
|
val = FIELD_PREP(FMC2_BXTR_BUSTURN, val);
|
|
regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_BUSTURN, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_data_hold(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val, reg;
|
|
int ret;
|
|
|
|
ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (prop->reg_type == FMC2_REG_BWTR)
|
|
val = setup ? min_t(u32, setup - 1, FMC2_BXTR_DATAHLD_MAX) : 0;
|
|
else
|
|
val = min_t(u32, setup, FMC2_BXTR_DATAHLD_MAX);
|
|
val = FIELD_PREP(FMC2_BXTR_DATAHLD, val);
|
|
regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAHLD, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_clk_period(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val;
|
|
|
|
val = setup ? clamp_val(setup - 1, 1, FMC2_BTR_CLKDIV_MAX) : 1;
|
|
val = FIELD_PREP(FMC2_BTR_CLKDIV, val);
|
|
regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_CLKDIV, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_data_latency(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 val;
|
|
|
|
val = setup > 1 ? min_t(u32, setup - 2, FMC2_BTR_DATLAT_MAX) : 0;
|
|
val = FIELD_PREP(FMC2_BTR_DATLAT, val);
|
|
regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_DATLAT, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_set_max_low_pulse(struct stm32_fmc2_ebi *ebi,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs, u32 setup)
|
|
{
|
|
u32 old_val, new_val, pcscntr;
|
|
|
|
if (setup < 1)
|
|
return 0;
|
|
|
|
regmap_read(ebi->regmap, FMC2_PCSCNTR, &pcscntr);
|
|
|
|
/* Enable counter for the bank */
|
|
regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
|
|
FMC2_PCSCNTR_CNTBEN(cs),
|
|
FMC2_PCSCNTR_CNTBEN(cs));
|
|
|
|
new_val = min_t(u32, setup - 1, FMC2_PCSCNTR_CSCOUNT_MAX);
|
|
old_val = FIELD_GET(FMC2_PCSCNTR_CSCOUNT, pcscntr);
|
|
if (old_val && new_val > old_val)
|
|
/* Keep current counter value */
|
|
return 0;
|
|
|
|
new_val = FIELD_PREP(FMC2_PCSCNTR_CSCOUNT, new_val);
|
|
regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
|
|
FMC2_PCSCNTR_CSCOUNT, new_val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct stm32_fmc2_prop stm32_fmc2_child_props[] = {
|
|
/* st,fmc2-ebi-cs-trans-type must be the first property */
|
|
{
|
|
.name = "st,fmc2-ebi-cs-transaction-type",
|
|
.mprop = true,
|
|
.set = stm32_fmc2_ebi_set_trans_type,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-cclk-enable",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR1_CCLKEN,
|
|
.check = stm32_fmc2_ebi_check_cclk,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-mux-enable",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR_MUXEN,
|
|
.check = stm32_fmc2_ebi_check_mux,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-buswidth",
|
|
.reset_val = FMC2_BUSWIDTH_16,
|
|
.set = stm32_fmc2_ebi_set_buswidth,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-waitpol-high",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR_WAITPOL,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-waitcfg-enable",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR_WAITCFG,
|
|
.check = stm32_fmc2_ebi_check_waitcfg,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-wait-enable",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR_WAITEN,
|
|
.check = stm32_fmc2_ebi_check_sync_trans,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-asyncwait-enable",
|
|
.bprop = true,
|
|
.reg_type = FMC2_REG_BCR,
|
|
.reg_mask = FMC2_BCR_ASYNCWAIT,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.set = stm32_fmc2_ebi_set_bit_field,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-cpsize",
|
|
.check = stm32_fmc2_ebi_check_cpsize,
|
|
.set = stm32_fmc2_ebi_set_cpsize,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-byte-lane-setup-ns",
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_bl_setup,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-address-setup-ns",
|
|
.reg_type = FMC2_REG_BTR,
|
|
.reset_val = FMC2_BXTR_ADDSET_MAX,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_address_setup,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-address-hold-ns",
|
|
.reg_type = FMC2_REG_BTR,
|
|
.reset_val = FMC2_BXTR_ADDHLD_MAX,
|
|
.check = stm32_fmc2_ebi_check_address_hold,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_address_hold,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-data-setup-ns",
|
|
.reg_type = FMC2_REG_BTR,
|
|
.reset_val = FMC2_BXTR_DATAST_MAX,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_data_setup,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-bus-turnaround-ns",
|
|
.reg_type = FMC2_REG_BTR,
|
|
.reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_bus_turnaround,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-data-hold-ns",
|
|
.reg_type = FMC2_REG_BTR,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_data_hold,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-clk-period-ns",
|
|
.reset_val = FMC2_BTR_CLKDIV_MAX + 1,
|
|
.check = stm32_fmc2_ebi_check_clk_period,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_clk_period,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-data-latency-ns",
|
|
.check = stm32_fmc2_ebi_check_sync_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clk_period,
|
|
.set = stm32_fmc2_ebi_set_data_latency,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-write-address-setup-ns",
|
|
.reg_type = FMC2_REG_BWTR,
|
|
.reset_val = FMC2_BXTR_ADDSET_MAX,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_address_setup,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-write-address-hold-ns",
|
|
.reg_type = FMC2_REG_BWTR,
|
|
.reset_val = FMC2_BXTR_ADDHLD_MAX,
|
|
.check = stm32_fmc2_ebi_check_address_hold,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_address_hold,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-write-data-setup-ns",
|
|
.reg_type = FMC2_REG_BWTR,
|
|
.reset_val = FMC2_BXTR_DATAST_MAX,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_data_setup,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-write-bus-turnaround-ns",
|
|
.reg_type = FMC2_REG_BWTR,
|
|
.reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_bus_turnaround,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-write-data-hold-ns",
|
|
.reg_type = FMC2_REG_BWTR,
|
|
.check = stm32_fmc2_ebi_check_async_trans,
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_data_hold,
|
|
},
|
|
{
|
|
.name = "st,fmc2-ebi-cs-max-low-pulse-ns",
|
|
.calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
|
|
.set = stm32_fmc2_ebi_set_max_low_pulse,
|
|
},
|
|
};
|
|
|
|
static int stm32_fmc2_ebi_parse_prop(struct stm32_fmc2_ebi *ebi,
|
|
struct device_node *dev_node,
|
|
const struct stm32_fmc2_prop *prop,
|
|
int cs)
|
|
{
|
|
struct device *dev = ebi->dev;
|
|
u32 setup = 0;
|
|
|
|
if (!prop->set) {
|
|
dev_err(dev, "property %s is not well defined\n", prop->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (prop->check && prop->check(ebi, prop, cs))
|
|
/* Skeep this property */
|
|
return 0;
|
|
|
|
if (prop->bprop) {
|
|
bool bprop;
|
|
|
|
bprop = of_property_read_bool(dev_node, prop->name);
|
|
if (prop->mprop && !bprop) {
|
|
dev_err(dev, "mandatory property %s not defined in the device tree\n",
|
|
prop->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (bprop)
|
|
setup = 1;
|
|
} else {
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(dev_node, prop->name, &val);
|
|
if (prop->mprop && ret) {
|
|
dev_err(dev, "mandatory property %s not defined in the device tree\n",
|
|
prop->name);
|
|
return ret;
|
|
}
|
|
|
|
if (ret)
|
|
setup = prop->reset_val;
|
|
else if (prop->calculate)
|
|
setup = prop->calculate(ebi, cs, val);
|
|
else
|
|
setup = val;
|
|
}
|
|
|
|
return prop->set(ebi, prop, cs, setup);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_enable_bank(struct stm32_fmc2_ebi *ebi, int cs)
|
|
{
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs),
|
|
FMC2_BCR_MBKEN, FMC2_BCR_MBKEN);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_disable_bank(struct stm32_fmc2_ebi *ebi, int cs)
|
|
{
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MBKEN, 0);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_save_setup(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
unsigned int cs;
|
|
|
|
for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
|
|
regmap_read(ebi->regmap, FMC2_BCR(cs), &ebi->bcr[cs]);
|
|
regmap_read(ebi->regmap, FMC2_BTR(cs), &ebi->btr[cs]);
|
|
regmap_read(ebi->regmap, FMC2_BWTR(cs), &ebi->bwtr[cs]);
|
|
}
|
|
|
|
regmap_read(ebi->regmap, FMC2_PCSCNTR, &ebi->pcscntr);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_set_setup(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
unsigned int cs;
|
|
|
|
for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
|
|
regmap_write(ebi->regmap, FMC2_BCR(cs), ebi->bcr[cs]);
|
|
regmap_write(ebi->regmap, FMC2_BTR(cs), ebi->btr[cs]);
|
|
regmap_write(ebi->regmap, FMC2_BWTR(cs), ebi->bwtr[cs]);
|
|
}
|
|
|
|
regmap_write(ebi->regmap, FMC2_PCSCNTR, ebi->pcscntr);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_disable_banks(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
unsigned int cs;
|
|
|
|
for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
|
|
if (!(ebi->bank_assigned & BIT(cs)))
|
|
continue;
|
|
|
|
stm32_fmc2_ebi_disable_bank(ebi, cs);
|
|
}
|
|
}
|
|
|
|
/* NWAIT signal can not be connected to EBI controller and NAND controller */
|
|
static bool stm32_fmc2_ebi_nwait_used_by_ctrls(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
unsigned int cs;
|
|
u32 bcr;
|
|
|
|
for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
|
|
if (!(ebi->bank_assigned & BIT(cs)))
|
|
continue;
|
|
|
|
regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
|
|
if ((bcr & FMC2_BCR_WAITEN || bcr & FMC2_BCR_ASYNCWAIT) &&
|
|
ebi->bank_assigned & BIT(FMC2_NAND))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_enable(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR1,
|
|
FMC2_BCR1_FMC2EN, FMC2_BCR1_FMC2EN);
|
|
}
|
|
|
|
static void stm32_fmc2_ebi_disable(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
regmap_update_bits(ebi->regmap, FMC2_BCR1, FMC2_BCR1_FMC2EN, 0);
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_setup_cs(struct stm32_fmc2_ebi *ebi,
|
|
struct device_node *dev_node,
|
|
u32 cs)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
stm32_fmc2_ebi_disable_bank(ebi, cs);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(stm32_fmc2_child_props); i++) {
|
|
const struct stm32_fmc2_prop *p = &stm32_fmc2_child_props[i];
|
|
|
|
ret = stm32_fmc2_ebi_parse_prop(ebi, dev_node, p, cs);
|
|
if (ret) {
|
|
dev_err(ebi->dev, "property %s could not be set: %d\n",
|
|
p->name, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
stm32_fmc2_ebi_enable_bank(ebi, cs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_parse_dt(struct stm32_fmc2_ebi *ebi)
|
|
{
|
|
struct device *dev = ebi->dev;
|
|
struct device_node *child;
|
|
bool child_found = false;
|
|
u32 bank;
|
|
int ret;
|
|
|
|
for_each_available_child_of_node(dev->of_node, child) {
|
|
ret = of_property_read_u32(child, "reg", &bank);
|
|
if (ret) {
|
|
dev_err(dev, "could not retrieve reg property: %d\n",
|
|
ret);
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
|
|
if (bank >= FMC2_MAX_BANKS) {
|
|
dev_err(dev, "invalid reg value: %d\n", bank);
|
|
of_node_put(child);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ebi->bank_assigned & BIT(bank)) {
|
|
dev_err(dev, "bank already assigned: %d\n", bank);
|
|
of_node_put(child);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (bank < FMC2_MAX_EBI_CE) {
|
|
ret = stm32_fmc2_ebi_setup_cs(ebi, child, bank);
|
|
if (ret) {
|
|
dev_err(dev, "setup chip select %d failed: %d\n",
|
|
bank, ret);
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ebi->bank_assigned |= BIT(bank);
|
|
child_found = true;
|
|
}
|
|
|
|
if (!child_found) {
|
|
dev_warn(dev, "no subnodes found, disable the driver.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (stm32_fmc2_ebi_nwait_used_by_ctrls(ebi)) {
|
|
dev_err(dev, "NWAIT signal connected to EBI and NAND controllers\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
stm32_fmc2_ebi_enable(ebi);
|
|
|
|
return of_platform_populate(dev->of_node, NULL, NULL, dev);
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct stm32_fmc2_ebi *ebi;
|
|
struct reset_control *rstc;
|
|
int ret;
|
|
|
|
ebi = devm_kzalloc(&pdev->dev, sizeof(*ebi), GFP_KERNEL);
|
|
if (!ebi)
|
|
return -ENOMEM;
|
|
|
|
ebi->dev = dev;
|
|
|
|
ebi->regmap = device_node_to_regmap(dev->of_node);
|
|
if (IS_ERR(ebi->regmap))
|
|
return PTR_ERR(ebi->regmap);
|
|
|
|
ebi->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(ebi->clk))
|
|
return PTR_ERR(ebi->clk);
|
|
|
|
rstc = devm_reset_control_get(dev, NULL);
|
|
if (PTR_ERR(rstc) == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
|
|
ret = clk_prepare_enable(ebi->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!IS_ERR(rstc)) {
|
|
reset_control_assert(rstc);
|
|
reset_control_deassert(rstc);
|
|
}
|
|
|
|
ret = stm32_fmc2_ebi_parse_dt(ebi);
|
|
if (ret)
|
|
goto err_release;
|
|
|
|
stm32_fmc2_ebi_save_setup(ebi);
|
|
platform_set_drvdata(pdev, ebi);
|
|
|
|
return 0;
|
|
|
|
err_release:
|
|
stm32_fmc2_ebi_disable_banks(ebi);
|
|
stm32_fmc2_ebi_disable(ebi);
|
|
clk_disable_unprepare(ebi->clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int stm32_fmc2_ebi_remove(struct platform_device *pdev)
|
|
{
|
|
struct stm32_fmc2_ebi *ebi = platform_get_drvdata(pdev);
|
|
|
|
of_platform_depopulate(&pdev->dev);
|
|
stm32_fmc2_ebi_disable_banks(ebi);
|
|
stm32_fmc2_ebi_disable(ebi);
|
|
clk_disable_unprepare(ebi->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stm32_fmc2_ebi_suspend(struct device *dev)
|
|
{
|
|
struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
|
|
|
|
stm32_fmc2_ebi_disable(ebi);
|
|
clk_disable_unprepare(ebi->clk);
|
|
pinctrl_pm_select_sleep_state(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stm32_fmc2_ebi_resume(struct device *dev)
|
|
{
|
|
struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
pinctrl_pm_select_default_state(dev);
|
|
|
|
ret = clk_prepare_enable(ebi->clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
stm32_fmc2_ebi_set_setup(ebi);
|
|
stm32_fmc2_ebi_enable(ebi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(stm32_fmc2_ebi_pm_ops, stm32_fmc2_ebi_suspend,
|
|
stm32_fmc2_ebi_resume);
|
|
|
|
static const struct of_device_id stm32_fmc2_ebi_match[] = {
|
|
{.compatible = "st,stm32mp1-fmc2-ebi"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, stm32_fmc2_ebi_match);
|
|
|
|
static struct platform_driver stm32_fmc2_ebi_driver = {
|
|
.probe = stm32_fmc2_ebi_probe,
|
|
.remove = stm32_fmc2_ebi_remove,
|
|
.driver = {
|
|
.name = "stm32_fmc2_ebi",
|
|
.of_match_table = stm32_fmc2_ebi_match,
|
|
.pm = &stm32_fmc2_ebi_pm_ops,
|
|
},
|
|
};
|
|
module_platform_driver(stm32_fmc2_ebi_driver);
|
|
|
|
MODULE_ALIAS("platform:stm32_fmc2_ebi");
|
|
MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 FMC2 ebi driver");
|
|
MODULE_LICENSE("GPL v2");
|