The GPMC is a unified memory controller dedicated for interfacing with external memory devices like - Asynchronous SRAM-like memories and ASICs - Asynchronous, synchronous, and page mode burst NOR flash - NAND flash - Pseudo-SRAM devices

This driver will take care of setting up the GPMC based on the settings specified in the Device tree and then probe its children.

Signed-off-by: Roger Quadros rogerq@kernel.org --- drivers/memory/Kconfig | 16 + drivers/memory/Makefile | 1 + drivers/memory/ti-gpmc.c | 1237 +++++++++++++++++++++++++++++++++ drivers/memory/ti-gpmc.h | 298 ++++++++ include/linux/mtd/omap_gpmc.h | 3 + 5 files changed, 1555 insertions(+) create mode 100644 drivers/memory/ti-gpmc.c create mode 100644 drivers/memory/ti-gpmc.h

diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index 7271892763..6ce48cebf9 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -24,4 +24,20 @@ config TI_AEMIF of 256M bytes of any of these memories can be accessed at a given time via four chip selects with 64M byte access per chip select.

+config TI_GPMC + bool "Texas Instruments GPMC driver" + depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 + help + This driver is for the General Purpose Memory Controller (GPMC) + present on Texas Instruments SoCs (e.g. OMAP2+). GPMC allows + interfacing to a variety of asynchronous as well as synchronous + memory drives like NOR, NAND, OneNAND, SRAM. + +config TI_GPMC_DEBUG + bool "Debug Texas Instruments GPMC timings" + default n + help + Enable this to print GPMC timings before and after the GPMC registers + are programmed. This should not be left enabled on production systems. + endmenu diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index fec52efb60..0971880fcf 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -1,3 +1,4 @@

obj-$(CONFIG_STM32_FMC2_EBI) += stm32-fmc2-ebi.o obj-$(CONFIG_TI_AEMIF) += ti-aemif.o +obj-$(CONFIG_TI_GPMC) += ti-gpmc.o diff --git a/drivers/memory/ti-gpmc.c b/drivers/memory/ti-gpmc.c new file mode 100644 index 0000000000..58133df16b --- /dev/null +++ b/drivers/memory/ti-gpmc.c @@ -0,0 +1,1237 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Texas Instruments GPMC Driver + * + * Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/ + */ + +#include <asm/io.h> +#include <asm/arch/sys_proto.h> +#include <clk.h> +#include <common.h> +#include <dm.h> +#include <dm/device-internal.h> +#include <dm/device_compat.h> +#include <dm/devres.h> +#include <dm/lists.h> +#include <linux/mtd/omap_gpmc.h> +#include <linux/ioport.h> +#include <linux/io.h> +#include "ti-gpmc.h" + +enum gpmc_clk_domain { + GPMC_CD_FCLK, + GPMC_CD_CLK +}; + +struct gpmc_cs_data { + const char *name; +#define GPMC_CS_RESERVED BIT(0) + u32 flags; +}; + +struct ti_gpmc { + void __iomem *base; + u32 cs_num; + u32 nr_waitpins; + struct clk *l3_clk; + u32 capability_flags; + struct resource data; +}; + +static struct gpmc_cs_data gpmc_cs[GPMC_CS_NUM]; +static unsigned int gpmc_cs_num = GPMC_CS_NUM; +static unsigned int gpmc_nr_waitpins; +const struct gpmc *gpmc_cfg; +static unsigned int gpmc_capability; +static void __iomem *gpmc_base; +static struct clk *gpmc_l3_clk; + +/* + * The first 1MB of GPMC address space is typically mapped to + * the internal ROM. Never allocate the first page, to + * facilitate bug detection; even if we didn't boot from ROM. + * As GPMC minimum partition size is 16MB we can only start from + * there. + */ +#define GPMC_MEM_START 0x1000000 +#define GPMC_MEM_END 0x3FFFFFFF + +static void gpmc_write_reg(int idx, u32 val) +{ + writel_relaxed(val, gpmc_base + idx); +} + +static u32 gpmc_read_reg(int idx) +{ + return readl_relaxed(gpmc_base + idx); +} + +static void gpmc_cs_write_reg(int cs, int idx, u32 val) +{ + void __iomem *reg_addr; + + reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; + writel_relaxed(val, reg_addr); +} + +static u32 gpmc_cs_read_reg(int cs, int idx) +{ + void __iomem *reg_addr; + + reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx; + return readl_relaxed(reg_addr); +} + +static unsigned long gpmc_get_fclk_period(void) +{ + unsigned long rate = clk_get_rate(gpmc_l3_clk); + + rate /= 1000; + rate = 1000000000 / rate; /* In picoseconds */ + + return rate; +} + +/** + * gpmc_get_clk_period - get period of selected clock domain in ps + * @cs: Chip Select Region. + * @cd: Clock Domain. + * + * GPMC_CS_CONFIG1 GPMCFCLKDIVIDER for cs has to be setup + * prior to calling this function with GPMC_CD_CLK. + */ +static unsigned long gpmc_get_clk_period(int cs, enum gpmc_clk_domain cd) +{ + unsigned long tick_ps = gpmc_get_fclk_period(); + u32 l; + int div; + + switch (cd) { + case GPMC_CD_CLK: + /* get current clk divider */ + l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); + div = (l & 0x03) + 1; + /* get GPMC_CLK period */ + tick_ps *= div; + break; + case GPMC_CD_FCLK: + default: + break; + } + + return tick_ps; +} + +static unsigned int gpmc_ns_to_clk_ticks(unsigned int time_ns, int cs, + enum gpmc_clk_domain cd) +{ + unsigned long tick_ps; + + /* Calculate in picosecs to yield more exact results */ + tick_ps = gpmc_get_clk_period(cs, cd); + + return (time_ns * 1000 + tick_ps - 1) / tick_ps; +} + +static unsigned int gpmc_ns_to_ticks(unsigned int time_ns) +{ + return gpmc_ns_to_clk_ticks(time_ns, /* any CS */ 0, GPMC_CD_FCLK); +} + +static unsigned int gpmc_ps_to_ticks(unsigned int time_ps) +{ + unsigned long tick_ps; + + /* Calculate in picosecs to yield more exact results */ + tick_ps = gpmc_get_fclk_period(); + + return (time_ps + tick_ps - 1) / tick_ps; +} + +static __maybe_unused unsigned int gpmc_clk_ticks_to_ns(unsigned int ticks, int cs, + enum gpmc_clk_domain cd) +{ + return ticks * gpmc_get_clk_period(cs, cd) / 1000; +} + +static inline void gpmc_cs_modify_reg(int cs, int reg, u32 mask, bool value) +{ + u32 l; + + l = gpmc_cs_read_reg(cs, reg); + if (value) + l |= mask; + else + l &= ~mask; + gpmc_cs_write_reg(cs, reg, l); +} + +static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p) +{ + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG1, + GPMC_CONFIG1_TIME_PARA_GRAN, + p->time_para_granularity); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG2, + GPMC_CONFIG2_CSEXTRADELAY, p->cs_extra_delay); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG3, + GPMC_CONFIG3_ADVEXTRADELAY, p->adv_extra_delay); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4, + GPMC_CONFIG4_OEEXTRADELAY, p->oe_extra_delay); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4, + GPMC_CONFIG4_WEEXTRADELAY, p->we_extra_delay); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6, + GPMC_CONFIG6_CYCLE2CYCLESAMECSEN, + p->cycle2cyclesamecsen); + gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6, + GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN, + p->cycle2cyclediffcsen); +} + +#if IS_ENABLED(CONFIG_TI_GPMC_DEBUG) +/** + * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it. + * @cs: Chip Select Region + * @reg: GPMC_CS_CONFIGn register offset. + * @st_bit: Start Bit + * @end_bit: End Bit. Must be >= @st_bit. + * @max: Maximum parameter value (before optional @shift). + * If 0, maximum is as high as @st_bit and @end_bit allow. + * @name: DTS node name, w/o "gpmc," + * @cd: Clock Domain of timing parameter. + * @shift: Parameter value left shifts @shift, which is then printed instead of value. + * @raw: Raw Format Option. + * raw format: gpmc,name = <value> + * tick format: gpmc,name = <value> /&zwj;* x ns -- y ns; x ticks *&zwj;/ + * Where x ns -- y ns result in the same tick value. + * When @max is exceeded, "invalid" is printed inside comment. + * @noval: Parameter values equal to 0 are not printed. + * @return: Specified timing parameter (after optional @shift). + * + */ +static int get_gpmc_timing_reg(/* timing specifiers */ + int cs, int reg, int st_bit, int end_bit, int max, + const char *name, const enum gpmc_clk_domain cd, + /* value transform */ + int shift, + /* format specifiers */ + bool raw, bool noval) +{ + u32 l; + int nr_bits; + int mask; + bool invalid; + + l = gpmc_cs_read_reg(cs, reg); + nr_bits = end_bit - st_bit + 1; + mask = (1 << nr_bits) - 1; + l = (l >> st_bit) & mask; + if (!max) + max = mask; + invalid = l > max; + if (shift) + l = (shift << l); + if (noval && l == 0) + return 0; + if (!raw) { + /* DTS tick format for timings in ns */ + unsigned int time_ns; + unsigned int time_ns_min = 0; + + if (l) + time_ns_min = gpmc_clk_ticks_to_ns(l - 1, cs, cd) + 1; + time_ns = gpmc_clk_ticks_to_ns(l, cs, cd); + pr_info("gpmc,%s = <%u>; /* %u ns - %u ns; %i ticks%s*/\n", + name, time_ns, time_ns_min, time_ns, l, + invalid ? "; invalid " : " "); + } else { + /* raw format */ + pr_info("gpmc,%s = <%u>;%s\n", name, l, + invalid ? " /* invalid */" : ""); + } + + return l; +} + +#define GPMC_PRINT_CONFIG(cs, config) \ + pr_info("CS%i %s: 0x%08x\n", cs, #config, \ + gpmc_cs_read_reg(cs, config)) +#define GPMC_GET_RAW(reg, st, end, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 0) +#define GPMC_GET_RAW_MAX(reg, st, end, max, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, 0, 1, 0) +#define GPMC_GET_RAW_BOOL(reg, st, end, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 1, 1) +#define GPMC_GET_RAW_SHIFT_MAX(reg, st, end, shift, max, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, GPMC_CD_FCLK, (shift), 1, 1) +#define GPMC_GET_TICKS(reg, st, end, field) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, GPMC_CD_FCLK, 0, 0, 0) +#define GPMC_GET_TICKS_CD(reg, st, end, field, cd) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), 0, field, (cd), 0, 0, 0) +#define GPMC_GET_TICKS_CD_MAX(reg, st, end, max, field, cd) \ + get_gpmc_timing_reg(cs, (reg), (st), (end), (max), field, (cd), 0, 0, 0) + +static void gpmc_show_regs(int cs, const char *desc) +{ + pr_info("gpmc cs%i %s:\n", cs, desc); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG1); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG2); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG3); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG4); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG5); + GPMC_PRINT_CONFIG(cs, GPMC_CS_CONFIG6); +} + +/* + * Note that gpmc,wait-pin handing wrongly assumes bit 8 is available, + * see commit c9fb809. + */ +static void gpmc_cs_show_timings(int cs, const char *desc) +{ + gpmc_show_regs(cs, desc); + + pr_info("gpmc cs%i access configuration:\n", cs); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 4, 4, "time-para-granularity"); + GPMC_GET_RAW(GPMC_CS_CONFIG1, 8, 9, "mux-add-data"); + GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 12, 13, 1, + GPMC_CONFIG1_DEVICESIZE_MAX, "device-width"); + GPMC_GET_RAW(GPMC_CS_CONFIG1, 16, 17, "wait-pin"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 21, 21, "wait-on-write"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 22, 22, "wait-on-read"); + GPMC_GET_RAW_SHIFT_MAX(GPMC_CS_CONFIG1, 23, 24, 4, + GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX, + "burst-length"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 27, 27, "sync-write"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 28, 28, "burst-write"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 29, 29, "gpmc,sync-read"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 30, 30, "burst-read"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG1, 31, 31, "burst-wrap"); + + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG2, 7, 7, "cs-extra-delay"); + + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG3, 7, 7, "adv-extra-delay"); + + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 23, 23, "we-extra-delay"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG4, 7, 7, "oe-extra-delay"); + + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 7, 7, "cycle2cycle-samecsen"); + GPMC_GET_RAW_BOOL(GPMC_CS_CONFIG6, 6, 6, "cycle2cycle-diffcsen"); + + pr_info("gpmc cs%i timings configuration:\n", cs); + GPMC_GET_TICKS(GPMC_CS_CONFIG2, 0, 3, "cs-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG2, 8, 12, "cs-rd-off-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG2, 16, 20, "cs-wr-off-ns"); + + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 0, 3, "adv-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 8, 12, "adv-rd-off-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 16, 20, "adv-wr-off-ns"); + if (gpmc_capability & GPMC_HAS_MUX_AAD) { + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 4, 6, "adv-aad-mux-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 24, 26, + "adv-aad-mux-rd-off-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG3, 28, 30, + "adv-aad-mux-wr-off-ns"); + } + + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 0, 3, "oe-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 8, 12, "oe-off-ns"); + if (gpmc_capability & GPMC_HAS_MUX_AAD) { + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 4, 6, "oe-aad-mux-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 13, 15, "oe-aad-mux-off-ns"); + } + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 16, 19, "we-on-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG4, 24, 28, "we-off-ns"); + + GPMC_GET_TICKS(GPMC_CS_CONFIG5, 0, 4, "rd-cycle-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG5, 8, 12, "wr-cycle-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG5, 16, 20, "access-ns"); + + GPMC_GET_TICKS(GPMC_CS_CONFIG5, 24, 27, "page-burst-access-ns"); + + GPMC_GET_TICKS(GPMC_CS_CONFIG6, 0, 3, "bus-turnaround-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG6, 8, 11, "cycle2cycle-delay-ns"); + + GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 18, 19, + GPMC_CONFIG1_WAITMONITORINGTIME_MAX, + "wait-monitoring-ns", GPMC_CD_CLK); + GPMC_GET_TICKS_CD_MAX(GPMC_CS_CONFIG1, 25, 26, + GPMC_CONFIG1_CLKACTIVATIONTIME_MAX, + "clk-activation-ns", GPMC_CD_FCLK); + + GPMC_GET_TICKS(GPMC_CS_CONFIG6, 16, 19, "wr-data-mux-bus-ns"); + GPMC_GET_TICKS(GPMC_CS_CONFIG6, 24, 28, "wr-access-ns"); +} +#else +static inline void gpmc_cs_show_timings(int cs, const char *desc) +{ +} +#endif + +/** + * set_gpmc_timing_reg - set a single timing parameter for Chip Select Region. + * Caller is expected to have initialized CONFIG1 GPMCFCLKDIVIDER + * prior to calling this function with @cd equal to GPMC_CD_CLK. + * + * @cs: Chip Select Region. + * @reg: GPMC_CS_CONFIGn register offset. + * @st_bit: Start Bit + * @end_bit: End Bit. Must be >= @st_bit. + * @max: Maximum parameter value. + * If 0, maximum is as high as @st_bit and @end_bit allow. + * @time: Timing parameter in ns. + * @cd: Timing parameter clock domain. + * @name: Timing parameter name. + * @return: 0 on success, -1 on error. + */ +static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, int max, + int time, enum gpmc_clk_domain cd, const char *name) +{ + u32 l; + int ticks, mask, nr_bits; + + if (time == 0) + ticks = 0; + else + ticks = gpmc_ns_to_clk_ticks(time, cs, cd); + nr_bits = end_bit - st_bit + 1; + mask = (1 << nr_bits) - 1; + + if (!max) + max = mask; + + if (ticks > max) { + pr_err("%s: GPMC CS%d: %s %d ns, %d ticks > %d ticks\n", + __func__, cs, name, time, ticks, max); + + return -1; + } + + l = gpmc_cs_read_reg(cs, reg); +#if IS_ENABLED(CONFIG_TI_GPMC_DEBUG) + pr_info("GPMC CS%d: %-17s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n", + cs, name, ticks, gpmc_get_clk_period(cs, cd) * ticks / 1000, + (l >> st_bit) & mask, time); +#endif + l &= ~(mask << st_bit); + l |= ticks << st_bit; + gpmc_cs_write_reg(cs, reg, l); + + return 0; +} + +/** + * gpmc_calc_waitmonitoring_divider - calculate proper GPMCFCLKDIVIDER based on WAITMONITORINGTIME + * WAITMONITORINGTIME will be _at least_ as long as desired, i.e. + * read --> don't sample bus too early + * write --> data is longer on bus + * + * Formula: + * gpmc_clk_div + 1 = ceil(ceil(waitmonitoringtime_ns / gpmc_fclk_ns) + * / waitmonitoring_ticks) + * WAITMONITORINGTIME resulting in 0 or 1 tick with div = 1 are caught by + * div <= 0 check. + * + * @wait_monitoring: WAITMONITORINGTIME in ns. + * @return: -1 on failure to scale, else proper divider > 0. + */ +static int gpmc_calc_waitmonitoring_divider(unsigned int wait_monitoring) +{ + int div = gpmc_ns_to_ticks(wait_monitoring); + + div += GPMC_CONFIG1_WAITMONITORINGTIME_MAX - 1; + div /= GPMC_CONFIG1_WAITMONITORINGTIME_MAX; + + if (div > 4) + return -1; + if (div <= 0) + div = 1; + + return div; +} + +/** + * gpmc_calc_divider - calculate GPMC_FCLK divider for sync_clk GPMC_CLK period. + * @sync_clk: GPMC_CLK period in ps. + * @return: Returns at least 1 if GPMC_FCLK can be divided to GPMC_CLK. + * Else, returns -1. + */ +static int gpmc_calc_divider(unsigned int sync_clk) +{ + int div = gpmc_ps_to_ticks(sync_clk); + + if (div > 4) + return -1; + if (div <= 0) + div = 1; + + return div; +} + +/** + * gpmc_cs_set_timings - program timing parameters for Chip Select Region. + * @cs: Chip Select Region. + * @t: GPMC timing parameters. + * @s: GPMC timing settings. + * @return: 0 on success, -1 on error. + */ +static int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t, + const struct gpmc_settings *s) +{ + int div, ret; + u32 l; + + div = gpmc_calc_divider(t->sync_clk); + if (div < 0) + return -EINVAL; + + /* + * See if we need to change the divider for waitmonitoringtime. + * + * Calculate GPMCFCLKDIVIDER independent of gpmc,sync-clk-ps in DT for + * pure asynchronous accesses, i.e. both read and write asynchronous. + * However, only do so if WAITMONITORINGTIME is actually used, i.e. + * either WAITREADMONITORING or WAITWRITEMONITORING is set. + * + * This statement must not change div to scale async WAITMONITORINGTIME + * to protect mixed synchronous and asynchronous accesses. + * + * We raise an error later if WAITMONITORINGTIME does not fit. + */ + if (!s->sync_read && !s->sync_write && + (s->wait_on_read || s->wait_on_write) + ) { + div = gpmc_calc_waitmonitoring_divider(t->wait_monitoring); + if (div < 0) { + pr_err("%s: waitmonitoringtime %3d ns too large for greatest gpmcfclkdivider.\n", + __func__, + t->wait_monitoring + ); + return -ENXIO; + } + } + + ret = 0; + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 0, 3, 0, t->cs_on, + GPMC_CD_FCLK, "cs_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 8, 12, 0, t->cs_rd_off, + GPMC_CD_FCLK, "cs_rd_off"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG2, 16, 20, 0, t->cs_wr_off, + GPMC_CD_FCLK, "cs_wr_off"); + if (ret) + return -ENXIO; + + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 0, 3, 0, t->adv_on, + GPMC_CD_FCLK, "adv_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 8, 12, 0, t->adv_rd_off, + GPMC_CD_FCLK, "adv_rd_off"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 16, 20, 0, t->adv_wr_off, + GPMC_CD_FCLK, "adv_wr_off"); + if (ret) + return -ENXIO; + + if (gpmc_capability & GPMC_HAS_MUX_AAD) { + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 4, 6, 0, + t->adv_aad_mux_on, GPMC_CD_FCLK, + "adv_aad_mux_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 24, 26, 0, + t->adv_aad_mux_rd_off, GPMC_CD_FCLK, + "adv_aad_mux_rd_off"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG3, 28, 30, 0, + t->adv_aad_mux_wr_off, GPMC_CD_FCLK, + "adv_aad_mux_wr_off"); + if (ret) + return -ENXIO; + } + + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 0, 3, 0, t->oe_on, + GPMC_CD_FCLK, "oe_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 8, 12, 0, t->oe_off, + GPMC_CD_FCLK, "oe_off"); + if (gpmc_capability & GPMC_HAS_MUX_AAD) { + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 4, 6, 0, + t->oe_aad_mux_on, GPMC_CD_FCLK, + "oe_aad_mux_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 13, 15, 0, + t->oe_aad_mux_off, GPMC_CD_FCLK, + "oe_aad_mux_off"); + } + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 16, 19, 0, t->we_on, + GPMC_CD_FCLK, "we_on"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG4, 24, 28, 0, t->we_off, + GPMC_CD_FCLK, "we_off"); + if (ret) + return -ENXIO; + + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 0, 4, 0, t->rd_cycle, + GPMC_CD_FCLK, "rd_cycle"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 8, 12, 0, t->wr_cycle, + GPMC_CD_FCLK, "wr_cycle"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 16, 20, 0, t->access, + GPMC_CD_FCLK, "access"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG5, 24, 27, 0, + t->page_burst_access, GPMC_CD_FCLK, + "page_burst_access"); + if (ret) + return -ENXIO; + + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 0, 3, 0, + t->bus_turnaround, GPMC_CD_FCLK, + "bus_turnaround"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 8, 11, 0, + t->cycle2cycle_delay, GPMC_CD_FCLK, + "cycle2cycle_delay"); + if (ret) + return -ENXIO; + + if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS) { + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 16, 19, 0, + t->wr_data_mux_bus, GPMC_CD_FCLK, + "wr_data_mux_bus"); + if (ret) + return -ENXIO; + } + if (gpmc_capability & GPMC_HAS_WR_ACCESS) { + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG6, 24, 28, 0, + t->wr_access, GPMC_CD_FCLK, + "wr_access"); + if (ret) + return -ENXIO; + } + + l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); + l &= ~0x03; + l |= (div - 1); + gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l); + + ret = 0; + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG1, 18, 19, + GPMC_CONFIG1_WAITMONITORINGTIME_MAX, + t->wait_monitoring, GPMC_CD_CLK, + "wait_monitoring"); + ret |= set_gpmc_timing_reg(cs, GPMC_CS_CONFIG1, 25, 26, + GPMC_CONFIG1_CLKACTIVATIONTIME_MAX, + t->clk_activation, GPMC_CD_FCLK, + "clk_activation"); + if (ret) + return -ENXIO; + +#if IS_ENABLED(CONFIG_TI_GPMC_DEBUG) + pr_info("GPMC CS%d CLK period is %lu ns (div %d)\n", + cs, (div * gpmc_get_fclk_period()) / 1000, div); +#endif + + gpmc_cs_bool_timings(cs, &t->bool_timings); + gpmc_cs_show_timings(cs, "after gpmc_cs_set_timings"); + + return 0; +} + +static int gpmc_cs_set_memconf(int cs, resource_size_t base, u32 size) +{ + u32 l; + u32 mask; + + /* + * Ensure that base address is aligned on a + * boundary equal to or greater than size. + */ + if (base & (size - 1)) + return -EINVAL; + + base >>= GPMC_CHUNK_SHIFT; + mask = (1 << GPMC_SECTION_SHIFT) - size; + mask >>= GPMC_CHUNK_SHIFT; + mask <<= GPMC_CONFIG7_MASKADDRESS_OFFSET; + + l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); + l &= ~GPMC_CONFIG7_MASK; + l |= base & GPMC_CONFIG7_BASEADDRESS_MASK; + l |= mask & GPMC_CONFIG7_MASKADDRESS_MASK; + l |= GPMC_CONFIG7_CSVALID; + gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); + + return 0; +} + +static void gpmc_cs_enable_mem(int cs) +{ + u32 l; + + l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); + l |= GPMC_CONFIG7_CSVALID; + gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); +} + +static void gpmc_cs_disable_mem(int cs) +{ + u32 l; + + l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); + l &= ~GPMC_CONFIG7_CSVALID; + gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); +} + +static void gpmc_cs_set_reserved(int cs, int reserved) +{ + struct gpmc_cs_data *gpmc = &gpmc_cs[cs]; + + gpmc->flags |= GPMC_CS_RESERVED; +} + +static bool gpmc_cs_reserved(int cs) +{ + struct gpmc_cs_data *gpmc = &gpmc_cs[cs]; + + return gpmc->flags & GPMC_CS_RESERVED; +} + +static unsigned long gpmc_mem_align(unsigned long size) +{ + int order; + + size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1); + order = GPMC_CHUNK_SHIFT - 1; + do { + size >>= 1; + order++; + } while (size); + size = 1 << order; + return size; +} + +static int gpmc_cs_request(ofnode node, int cs, struct resource *res) +{ + int r = -1; + u32 size; + resource_size_t addr_base = res->start; + + if (cs >= gpmc_cs_num) { + pr_err("%s: requested chip-select is disabled\n", __func__); + return -ENODEV; + } + + size = gpmc_mem_align(resource_size(res)); + if (size > (1 << GPMC_SECTION_SHIFT)) + return -ENOMEM; + + if (gpmc_cs_reserved(cs)) { + r = -EBUSY; + goto out; + } + + if (addr_base & (SZ_16M - 1)) { + pr_err("CS region should be aligned to 16M boundary\n"); + goto out; + } + + /* Disable CS while changing base address and size mask */ + gpmc_cs_disable_mem(cs); + + r = gpmc_cs_set_memconf(cs, addr_base, size); + if (r < 0) + goto out; + + /* Enable CS */ + gpmc_cs_enable_mem(cs); + gpmc_cs_set_reserved(cs, 1); +out: + return r; +} + +static void gpmc_cs_free(int cs) +{ + if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) { + pr_warn("Trying to free non-reserved GPMC CS%d\n", cs); + return; + } + + gpmc_cs_disable_mem(cs); + gpmc_cs_set_reserved(cs, 0); +} + +/** + * gpmc_configure - write request to configure gpmc + * @cmd: command type + * @wval: value to write + * @return status of the operation + */ +static int gpmc_configure(int cmd, int wval) +{ + u32 regval; + + switch (cmd) { + case GPMC_CONFIG_WP: + regval = gpmc_read_reg(GPMC_CONFIG); + if (wval) + regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */ + else + regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */ + gpmc_write_reg(GPMC_CONFIG, regval); + break; + + default: + pr_err("%s: command not supported\n", __func__); + return -EINVAL; + } + + return 0; +} + +/** + * gpmc_cs_program_settings - programs non-timing related settings + * @cs: GPMC chip-select to program + * @p: pointer to GPMC settings structure + * + * Programs non-timing related settings for a GPMC chip-select, such as + * bus-width, burst configuration, etc. Function should be called once + * for each chip-select that is being used and must be called before + * calling gpmc_cs_set_timings() as timing parameters in the CONFIG1 + * register will be initialised to zero by this function. Returns 0 on + * success and appropriate negative error code on failure. + */ +static int gpmc_cs_program_settings(int cs, struct gpmc_settings *p) +{ + u32 config1; + + if (!p->device_width || p->device_width > GPMC_DEVWIDTH_16BIT) { + pr_err("%s: invalid width %d!", __func__, p->device_width); + return -EINVAL; + } + + /* Address-data multiplexing not supported for NAND devices */ + if (p->device_nand && p->mux_add_data) { + pr_err("%s: invalid configuration!\n", __func__); + return -EINVAL; + } + + if (p->mux_add_data > GPMC_MUX_AD || + (p->mux_add_data == GPMC_MUX_AAD && + !(gpmc_capability & GPMC_HAS_MUX_AAD))) { + pr_err("%s: invalid multiplex configuration!\n", __func__); + return -EINVAL; + } + + /* Page/burst mode supports lengths of 4, 8 and 16 bytes */ + if (p->burst_read || p->burst_write) { + switch (p->burst_len) { + case GPMC_BURST_4: + case GPMC_BURST_8: + case GPMC_BURST_16: + break; + default: + pr_err("%s: invalid page/burst-length (%d)\n", + __func__, p->burst_len); + return -EINVAL; + } + } + + if (p->wait_pin > gpmc_nr_waitpins) { + pr_err("%s: invalid wait-pin (%d)\n", __func__, p->wait_pin); + return -EINVAL; + } + + config1 = GPMC_CONFIG1_DEVICESIZE((p->device_width - 1)); + + if (p->sync_read) + config1 |= GPMC_CONFIG1_READTYPE_SYNC; + if (p->sync_write) + config1 |= GPMC_CONFIG1_WRITETYPE_SYNC; + if (p->wait_on_read) + config1 |= GPMC_CONFIG1_WAIT_READ_MON; + if (p->wait_on_write) + config1 |= GPMC_CONFIG1_WAIT_WRITE_MON; + if (p->wait_on_read || p->wait_on_write) + config1 |= GPMC_CONFIG1_WAIT_PIN_SEL(p->wait_pin); + if (p->device_nand) + config1 |= GPMC_CONFIG1_DEVICETYPE(GPMC_DEVICETYPE_NAND); + if (p->mux_add_data) + config1 |= GPMC_CONFIG1_MUXTYPE(p->mux_add_data); + if (p->burst_read) + config1 |= GPMC_CONFIG1_READMULTIPLE_SUPP; + if (p->burst_write) + config1 |= GPMC_CONFIG1_WRITEMULTIPLE_SUPP; + if (p->burst_read || p->burst_write) { + config1 |= GPMC_CONFIG1_PAGE_LEN(p->burst_len >> 3); + config1 |= p->burst_wrap ? GPMC_CONFIG1_WRAPBURST_SUPP : 0; + } + + gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, config1); + + return 0; +} + +static void gpmc_cs_set_name(int cs, const char *name) +{ + struct gpmc_cs_data *gpmc = &gpmc_cs[cs]; + + gpmc->name = name; +} + +static const char *gpmc_cs_get_name(int cs) +{ + struct gpmc_cs_data *gpmc = &gpmc_cs[cs]; + + return gpmc->name; +} + +/** + * gpmc_read_settings_dt - read gpmc settings from device-tree + * @np: pointer to device-tree node for a gpmc child device + * @p: pointer to gpmc settings structure + * + * Reads the GPMC settings for a GPMC child device from device-tree and + * stores them in the GPMC settings structure passed. The GPMC settings + * structure is initialised to zero by this function and so any + * previously stored settings will be cleared. + */ +static void gpmc_read_settings_dt(ofnode np, struct gpmc_settings *p) +{ + memset(p, 0, sizeof(struct gpmc_settings)); + + p->sync_read = ofnode_read_bool(np, "gpmc,sync-read"); + p->sync_write = ofnode_read_bool(np, "gpmc,sync-write"); + ofnode_read_u32(np, "gpmc,device-width", &p->device_width); + ofnode_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data); + + if (!ofnode_read_u32(np, "gpmc,burst-length", &p->burst_len)) { + p->burst_wrap = ofnode_read_bool(np, "gpmc,burst-wrap"); + p->burst_read = ofnode_read_bool(np, "gpmc,burst-read"); + p->burst_write = ofnode_read_bool(np, "gpmc,burst-write"); + if (!p->burst_read && !p->burst_write) + pr_warn("%s: page/burst-length set but not used!\n", + __func__); + } + + if (!ofnode_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) { + p->wait_on_read = ofnode_read_bool(np, + "gpmc,wait-on-read"); + p->wait_on_write = ofnode_read_bool(np, + "gpmc,wait-on-write"); + if (!p->wait_on_read && !p->wait_on_write) + pr_debug("%s: rd/wr wait monitoring not enabled!\n", + __func__); + } +} + +static void gpmc_read_timings_dt(ofnode np, + struct gpmc_timings *gpmc_t) +{ + struct gpmc_bool_timings *p; + + if (!gpmc_t) + return; + + memset(gpmc_t, 0, sizeof(*gpmc_t)); + + /* minimum clock period for syncronous mode */ + ofnode_read_u32(np, "gpmc,sync-clk-ps", &gpmc_t->sync_clk); + + /* chip select timtings */ + ofnode_read_u32(np, "gpmc,cs-on-ns", &gpmc_t->cs_on); + ofnode_read_u32(np, "gpmc,cs-rd-off-ns", &gpmc_t->cs_rd_off); + ofnode_read_u32(np, "gpmc,cs-wr-off-ns", &gpmc_t->cs_wr_off); + + /* ADV signal timings */ + ofnode_read_u32(np, "gpmc,adv-on-ns", &gpmc_t->adv_on); + ofnode_read_u32(np, "gpmc,adv-rd-off-ns", &gpmc_t->adv_rd_off); + ofnode_read_u32(np, "gpmc,adv-wr-off-ns", &gpmc_t->adv_wr_off); + ofnode_read_u32(np, "gpmc,adv-aad-mux-on-ns", + &gpmc_t->adv_aad_mux_on); + ofnode_read_u32(np, "gpmc,adv-aad-mux-rd-off-ns", + &gpmc_t->adv_aad_mux_rd_off); + ofnode_read_u32(np, "gpmc,adv-aad-mux-wr-off-ns", + &gpmc_t->adv_aad_mux_wr_off); + + /* WE signal timings */ + ofnode_read_u32(np, "gpmc,we-on-ns", &gpmc_t->we_on); + ofnode_read_u32(np, "gpmc,we-off-ns", &gpmc_t->we_off); + + /* OE signal timings */ + ofnode_read_u32(np, "gpmc,oe-on-ns", &gpmc_t->oe_on); + ofnode_read_u32(np, "gpmc,oe-off-ns", &gpmc_t->oe_off); + ofnode_read_u32(np, "gpmc,oe-aad-mux-on-ns", + &gpmc_t->oe_aad_mux_on); + ofnode_read_u32(np, "gpmc,oe-aad-mux-off-ns", + &gpmc_t->oe_aad_mux_off); + + /* access and cycle timings */ + ofnode_read_u32(np, "gpmc,page-burst-access-ns", + &gpmc_t->page_burst_access); + ofnode_read_u32(np, "gpmc,access-ns", &gpmc_t->access); + ofnode_read_u32(np, "gpmc,rd-cycle-ns", &gpmc_t->rd_cycle); + ofnode_read_u32(np, "gpmc,wr-cycle-ns", &gpmc_t->wr_cycle); + ofnode_read_u32(np, "gpmc,bus-turnaround-ns", + &gpmc_t->bus_turnaround); + ofnode_read_u32(np, "gpmc,cycle2cycle-delay-ns", + &gpmc_t->cycle2cycle_delay); + ofnode_read_u32(np, "gpmc,wait-monitoring-ns", + &gpmc_t->wait_monitoring); + ofnode_read_u32(np, "gpmc,clk-activation-ns", + &gpmc_t->clk_activation); + + /* only applicable to OMAP3+ */ + ofnode_read_u32(np, "gpmc,wr-access-ns", &gpmc_t->wr_access); + ofnode_read_u32(np, "gpmc,wr-data-mux-bus-ns", + &gpmc_t->wr_data_mux_bus); + + /* bool timing parameters */ + p = &gpmc_t->bool_timings; + + p->cycle2cyclediffcsen = + ofnode_read_bool(np, "gpmc,cycle2cycle-diffcsen"); + p->cycle2cyclesamecsen = + ofnode_read_bool(np, "gpmc,cycle2cycle-samecsen"); + p->we_extra_delay = ofnode_read_bool(np, "gpmc,we-extra-delay"); + p->oe_extra_delay = ofnode_read_bool(np, "gpmc,oe-extra-delay"); + p->adv_extra_delay = ofnode_read_bool(np, "gpmc,adv-extra-delay"); + p->cs_extra_delay = ofnode_read_bool(np, "gpmc,cs-extra-delay"); + p->time_para_granularity = + ofnode_read_bool(np, "gpmc,time-para-granularity"); +} + +/** + * gpmc_probe_generic_child - configures the gpmc for a child device + * @dev: pointer to gpmc platform device + * @child: pointer to device-tree node for child device + * + * Allocates and configures a GPMC chip-select for a child device. + * Returns 0 on success and appropriate negative error code on failure. + */ +static int gpmc_probe_generic_child(struct udevice *dev, + ofnode child) +{ + struct gpmc_settings gpmc_s; + struct gpmc_timings gpmc_t; + struct resource res; + const char *name; + int ret; + u32 val, cs; + + if (ofnode_read_u32(child, "reg", &cs) < 0) { + dev_err(dev, "can't get reg property of child %s\n", + ofnode_get_name(child)); + return -ENODEV; + } + + if (ofnode_read_resource(child, 0, &res) < 0) { + dev_err(dev, "%s has malformed 'reg' property\n", + ofnode_get_name(child)); + return -ENODEV; + } + + /* + * Check if we have multiple instances of the same device + * on a single chip select. If so, use the already initialized + * timings. + */ + name = gpmc_cs_get_name(cs); + if (name && !strcmp(name, ofnode_get_name(child))) + goto no_timings; + + ret = gpmc_cs_request(child, cs, &res); + if (ret < 0) { + dev_err(dev, "cannot request GPMC CS %d\n", cs); + return ret; + } + gpmc_cs_set_name(cs, ofnode_get_name(child)); + + gpmc_read_settings_dt(child, &gpmc_s); + gpmc_read_timings_dt(child, &gpmc_t); + + /* + * For some GPMC devices we still need to rely on the bootloader + * timings because the devices can be connected via FPGA. + * REVISIT: Add timing support from slls644g.pdf. + */ + if (!gpmc_t.cs_rd_off) { + pr_warn("enable GPMC debug to configure .dts timings for CS%i\n", + cs); + gpmc_cs_show_timings(cs, + "please add GPMC bootloader timings to .dts"); + goto no_timings; + } + + /* CS must be disabled while making changes to gpmc configuration */ + gpmc_cs_disable_mem(cs); + + if (!ofnode_read_u32(child, "nand-bus-width", &val)) { + /* NAND specific setup */ + ofnode_read_u32(child, "nand-bus-width", &val); + switch (val) { + case 8: + gpmc_s.device_width = GPMC_DEVWIDTH_8BIT; + break; + case 16: + gpmc_s.device_width = GPMC_DEVWIDTH_16BIT; + break; + default: + dev_err(dev, "%s: invalid 'nand-bus-width'\n", + ofnode_get_name(child)); + ret = -EINVAL; + goto err; + } + + /* disable write protect */ + gpmc_configure(GPMC_CONFIG_WP, 0); + gpmc_s.device_nand = true; + } else { + ret = ofnode_read_u32(child, "bank-width", + &gpmc_s.device_width); + if (ret < 0 && !gpmc_s.device_width) { + dev_err(dev, + "%s has no 'gpmc,device-width' property\n", + ofnode_get_name(child)); + goto err; + } + } + + gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings"); + + ret = gpmc_cs_program_settings(cs, &gpmc_s); + if (ret < 0) + goto err; + + ret = gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s); + if (ret) { + dev_err(dev, "failed to set gpmc timings for: %s\n", + ofnode_get_name(child)); + goto err; + } + + /* Clear limited address i.e. enable A26-A11 */ + val = gpmc_read_reg(GPMC_CONFIG); + val &= ~GPMC_CONFIG_LIMITEDADDRESS; + gpmc_write_reg(GPMC_CONFIG, val); + + /* Enable CS region */ + gpmc_cs_enable_mem(cs); + +no_timings: + + return 0; + +err: + gpmc_cs_free(cs); + + return ret; +} + +static void gpmc_probe_dt_children(struct udevice *dev) +{ + int ret; + ofnode child; + + ofnode_for_each_subnode(child, dev_ofnode(dev)) { + ret = gpmc_probe_generic_child(dev, child); + if (ret) { + dev_err(dev, "Cannot parse child %s:%d", + ofnode_get_name(child), ret); + } + } +} + +static int gpmc_parse_dt(struct udevice *dev, struct ti_gpmc *gpmc) +{ + int ret; + u32 val; + + ret = ofnode_read_u32(dev_ofnode(dev), "gpmc,num-cs", + &val); + if (ret < 0) { + pr_err("%s: number of chip-selects not defined\n", __func__); + return ret; + } else if (val < 1) { + pr_err("%s: all chip-selects are disabled\n", __func__); + return -EINVAL; + } else if (val > GPMC_CS_NUM) { + pr_err("%s: number of supported chip-selects cannot be > %d\n", + __func__, GPMC_CS_NUM); + return -EINVAL; + } + + gpmc->cs_num = val; + gpmc_cs_num = val; + + ret = ofnode_read_u32(dev_ofnode(dev), "gpmc,num-waitpins", + &gpmc->nr_waitpins); + if (ret < 0) { + pr_err("%s: number of wait pins not found!\n", __func__); + return ret; + } + + gpmc_nr_waitpins = gpmc->nr_waitpins; + + return 0; +} + +static int gpmc_probe(struct udevice *dev) +{ + struct ti_gpmc *priv = dev_get_priv(dev); + int ret; + struct resource res; + + ret = dev_read_resource_byname(dev, "cfg", &res); + if (ret) { + /* Legacy DT */ + dev_read_resource(dev, 0, &res); + priv->base = devm_ioremap(dev, res.start, resource_size(&res)); + + priv->data.start = GPMC_MEM_START; + priv->data.end = GPMC_MEM_END; + } else { + priv->base = devm_ioremap(dev, res.start, resource_size(&res)); + ret = dev_read_resource_byname(dev, "data", &res); + if (ret) + return -ENOENT; + + priv->data = res; + } + + if (!priv->base) + return -ENOMEM; + + gpmc_cfg = (struct gpmc *)priv->base; + gpmc_base = priv->base; + + priv->l3_clk = devm_clk_get(dev, "fck"); + if (IS_ERR(priv->l3_clk)) + return PTR_ERR(priv->l3_clk); + + if (!clk_get_rate(priv->l3_clk)) + return -EINVAL; + + gpmc_l3_clk = priv->l3_clk; + + ret = gpmc_parse_dt(dev, priv); + if (ret) + return ret; + + priv->capability_flags = dev->driver->of_match->data; + gpmc_capability = priv->capability_flags; + + gpmc_probe_dt_children(dev); + + return 0; +} + +#define GPMC_DATA_REV2_4 0 +#define GPMC_DATA_REV5 (GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS) +#define GPMC_DATA_REV6 (GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS | GPMC_HAS_MUX_AAD) + +static const struct udevice_id gpmc_dt_ids[] = { + { .compatible = "ti,am64-gpmc", .data = GPMC_DATA_REV6, }, + { .compatible = "ti,am3352-gpmc", .data = GPMC_DATA_REV5, }, + { .compatible = "ti,omap2420-gpmc", .data = GPMC_DATA_REV2_4, }, + { .compatible = "ti,omap2430-gpmc", .data = GPMC_DATA_REV2_4, }, + { .compatible = "ti,omap3430-gpmc", .data = GPMC_DATA_REV5, }, + { .compatible = "ti,omap4430-gpmc", .data = GPMC_DATA_REV6, }, + { } /* sentinel */ +}; + +U_BOOT_DRIVER(ti_gpmc) = { + .name = "ti-gpmc", + .id = UCLASS_SIMPLE_BUS, + .of_match = gpmc_dt_ids, + .probe = gpmc_probe, + .flags = DM_FLAG_ALLOC_PRIV_DMA, +}; diff --git a/drivers/memory/ti-gpmc.h b/drivers/memory/ti-gpmc.h new file mode 100644 index 0000000000..90f8e656c8 --- /dev/null +++ b/drivers/memory/ti-gpmc.h @@ -0,0 +1,298 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Texas Instruments GPMC Driver + * + * Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/ + */ + +/* GPMC register offsets */ +#define GPMC_REVISION 0x00 +#define GPMC_SYSCONFIG 0x10 +#define GPMC_SYSSTATUS 0x14 +#define GPMC_IRQSTATUS 0x18 +#define GPMC_IRQENABLE 0x1c +#define GPMC_TIMEOUT_CONTROL 0x40 +#define GPMC_ERR_ADDRESS 0x44 +#define GPMC_ERR_TYPE 0x48 +#define GPMC_CONFIG 0x50 +#define GPMC_STATUS 0x54 +#define GPMC_PREFETCH_CONFIG1 0x1e0 +#define GPMC_PREFETCH_CONFIG2 0x1e4 +#define GPMC_PREFETCH_CONTROL 0x1ec +#define GPMC_PREFETCH_STATUS 0x1f0 +#define GPMC_ECC_CONFIG 0x1f4 +#define GPMC_ECC_CONTROL 0x1f8 +#define GPMC_ECC_SIZE_CONFIG 0x1fc +#define GPMC_ECC1_RESULT 0x200 +#define GPMC_ECC_BCH_RESULT_0 0x240 /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_1 0x244 /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_2 0x248 /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_3 0x24c /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_4 0x300 /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_5 0x304 /* not available on OMAP2 */ +#define GPMC_ECC_BCH_RESULT_6 0x308 /* not available on OMAP2 */ + +/* GPMC ECC control settings */ +#define GPMC_ECC_CTRL_ECCCLEAR 0x100 +#define GPMC_ECC_CTRL_ECCDISABLE 0x000 +#define GPMC_ECC_CTRL_ECCREG1 0x001 +#define GPMC_ECC_CTRL_ECCREG2 0x002 +#define GPMC_ECC_CTRL_ECCREG3 0x003 +#define GPMC_ECC_CTRL_ECCREG4 0x004 +#define GPMC_ECC_CTRL_ECCREG5 0x005 +#define GPMC_ECC_CTRL_ECCREG6 0x006 +#define GPMC_ECC_CTRL_ECCREG7 0x007 +#define GPMC_ECC_CTRL_ECCREG8 0x008 +#define GPMC_ECC_CTRL_ECCREG9 0x009 + +#define GPMC_CONFIG_LIMITEDADDRESS BIT(1) + +#define GPMC_STATUS_EMPTYWRITEBUFFERSTATUS BIT(0) + +#define GPMC_CONFIG2_CSEXTRADELAY BIT(7) +#define GPMC_CONFIG3_ADVEXTRADELAY BIT(7) +#define GPMC_CONFIG4_OEEXTRADELAY BIT(7) +#define GPMC_CONFIG4_WEEXTRADELAY BIT(23) +#define GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN BIT(6) +#define GPMC_CONFIG6_CYCLE2CYCLESAMECSEN BIT(7) + +#define GPMC_CS0_OFFSET 0x60 +#define GPMC_CS_SIZE 0x30 +#define GPMC_BCH_SIZE 0x10 + +/* + * The first 1MB of GPMC address space is typically mapped to + * the internal ROM. Never allocate the first page, to + * facilitate bug detection; even if we didn't boot from ROM. + * As GPMC minimum partition size is 16MB we can only start from + * there. + */ +#define GPMC_MEM_START 0x1000000 +#define GPMC_MEM_END 0x3FFFFFFF + +#define GPMC_CHUNK_SHIFT 24 /* 16 MB */ +#define GPMC_SECTION_SHIFT 28 /* 128 MB */ + +#define CS_NUM_SHIFT 24 +#define ENABLE_PREFETCH (0x1 << 7) +#define DMA_MPU_MODE 2 + +#define GPMC_REVISION_MAJOR(l) (((l) >> 4) & 0xf) +#define GPMC_REVISION_MINOR(l) ((l) & 0xf) + +#define GPMC_HAS_WR_ACCESS 0x1 +#define GPMC_HAS_WR_DATA_MUX_BUS 0x2 +#define GPMC_HAS_MUX_AAD 0x4 + +#define GPMC_NR_WAITPINS 4 + +#define GPMC_CS_CONFIG1 0x00 +#define GPMC_CS_CONFIG2 0x04 +#define GPMC_CS_CONFIG3 0x08 +#define GPMC_CS_CONFIG4 0x0c +#define GPMC_CS_CONFIG5 0x10 +#define GPMC_CS_CONFIG6 0x14 +#define GPMC_CS_CONFIG7 0x18 +#define GPMC_CS_NAND_COMMAND 0x1c +#define GPMC_CS_NAND_ADDRESS 0x20 +#define GPMC_CS_NAND_DATA 0x24 + +/* Control Commands */ +#define GPMC_CONFIG_RDY_BSY 0x00000001 +#define GPMC_CONFIG_DEV_SIZE 0x00000002 +#define GPMC_CONFIG_DEV_TYPE 0x00000003 + +#define GPMC_CONFIG_WP 0x00000005 + +#define GPMC_CONFIG1_WRAPBURST_SUPP BIT(31) +#define GPMC_CONFIG1_READMULTIPLE_SUPP BIT(30) +#define GPMC_CONFIG1_READTYPE_ASYNC (0 << 29) +#define GPMC_CONFIG1_READTYPE_SYNC BIT(29) +#define GPMC_CONFIG1_WRITEMULTIPLE_SUPP BIT(28) +#define GPMC_CONFIG1_WRITETYPE_ASYNC (0 << 27) +#define GPMC_CONFIG1_WRITETYPE_SYNC BIT(27) +#define GPMC_CONFIG1_CLKACTIVATIONTIME(val) (((val) & 3) << 25) +/** CLKACTIVATIONTIME Max Ticks */ +#define GPMC_CONFIG1_CLKACTIVATIONTIME_MAX 2 +#define GPMC_CONFIG1_PAGE_LEN(val) (((val) & 3) << 23) +/** ATTACHEDDEVICEPAGELENGTH Max Value */ +#define GPMC_CONFIG1_ATTACHEDDEVICEPAGELENGTH_MAX 2 +#define GPMC_CONFIG1_WAIT_READ_MON BIT(22) +#define GPMC_CONFIG1_WAIT_WRITE_MON BIT(21) +#define GPMC_CONFIG1_WAIT_MON_TIME(val) (((val) & 3) << 18) +/** WAITMONITORINGTIME Max Ticks */ +#define GPMC_CONFIG1_WAITMONITORINGTIME_MAX 2 +#define GPMC_CONFIG1_WAIT_PIN_SEL(val) (((val) & 3) << 16) +#define GPMC_CONFIG1_DEVICESIZE(val) (((val) & 3) << 12) +#define GPMC_CONFIG1_DEVICESIZE_16 GPMC_CONFIG1_DEVICESIZE(1) +/** DEVICESIZE Max Value */ +#define GPMC_CONFIG1_DEVICESIZE_MAX 1 +#define GPMC_CONFIG1_DEVICETYPE(val) (((val) & 3) << 10) +#define GPMC_CONFIG1_DEVICETYPE_NOR GPMC_CONFIG1_DEVICETYPE(0) +#define GPMC_CONFIG1_MUXTYPE(val) (((val) & 3) << 8) +#define GPMC_CONFIG1_TIME_PARA_GRAN BIT(4) +#define GPMC_CONFIG1_FCLK_DIV(val) ((val) & 3) +#define GPMC_CONFIG1_FCLK_DIV2 (GPMC_CONFIG1_FCLK_DIV(1)) +#define GPMC_CONFIG1_FCLK_DIV3 (GPMC_CONFIG1_FCLK_DIV(2)) +#define GPMC_CONFIG1_FCLK_DIV4 (GPMC_CONFIG1_FCLK_DIV(3)) +#define GPMC_CONFIG7_CSVALID BIT(6) + +#define GPMC_CONFIG7_BASEADDRESS_MASK 0x3f +#define GPMC_CONFIG7_CSVALID_MASK BIT(6) +#define GPMC_CONFIG7_MASKADDRESS_OFFSET 8 +#define GPMC_CONFIG7_MASKADDRESS_MASK (0xf << GPMC_CONFIG7_MASKADDRESS_OFFSET) +/* All CONFIG7 bits except reserved bits */ +#define GPMC_CONFIG7_MASK (GPMC_CONFIG7_BASEADDRESS_MASK | \ + GPMC_CONFIG7_CSVALID_MASK | \ + GPMC_CONFIG7_MASKADDRESS_MASK) + +#define GPMC_DEVICETYPE_NOR 0 +#define GPMC_DEVICETYPE_NAND 2 +#define GPMC_CONFIG_WRITEPROTECT 0x00000010 +#define WR_RD_PIN_MONITORING 0x00600000 + +/* ECC commands */ +#define GPMC_ECC_READ 0 /* Reset Hardware ECC for read */ +#define GPMC_ECC_WRITE 1 /* Reset Hardware ECC for write */ +#define GPMC_ECC_READSYN 2 /* Reset before syndrom is read back */ + +#define GPMC_NR_NAND_IRQS 2 /* number of NAND specific IRQs */ + +/* bool type time settings */ +struct gpmc_bool_timings { + bool cycle2cyclediffcsen; + bool cycle2cyclesamecsen; + bool we_extra_delay; + bool oe_extra_delay; + bool adv_extra_delay; + bool cs_extra_delay; + bool time_para_granularity; +}; + +/* + * Note that all values in this struct are in nanoseconds except sync_clk + * (which is in picoseconds), while the register values are in gpmc_fck cycles. + */ +struct gpmc_timings { + /* Minimum clock period for synchronous mode (in picoseconds) */ + u32 sync_clk; + + /* Chip-select signal timings corresponding to GPMC_CS_CONFIG2 */ + u32 cs_on; /* Assertion time */ + u32 cs_rd_off; /* Read deassertion time */ + u32 cs_wr_off; /* Write deassertion time */ + + /* ADV signal timings corresponding to GPMC_CONFIG3 */ + u32 adv_on; /* Assertion time */ + u32 adv_rd_off; /* Read deassertion time */ + u32 adv_wr_off; /* Write deassertion time */ + u32 adv_aad_mux_on; /* ADV assertion time for AAD */ + u32 adv_aad_mux_rd_off; /* ADV read deassertion time for AAD */ + u32 adv_aad_mux_wr_off; /* ADV write deassertion time for AAD */ + + /* WE signals timings corresponding to GPMC_CONFIG4 */ + u32 we_on; /* WE assertion time */ + u32 we_off; /* WE deassertion time */ + + /* OE signals timings corresponding to GPMC_CONFIG4 */ + u32 oe_on; /* OE assertion time */ + u32 oe_off; /* OE deassertion time */ + u32 oe_aad_mux_on; /* OE assertion time for AAD */ + u32 oe_aad_mux_off; /* OE deassertion time for AAD */ + + /* Access time and cycle time timings corresponding to GPMC_CONFIG5 */ + u32 page_burst_access; /* Multiple access word delay */ + u32 access; /* Start-cycle to first data valid delay */ + u32 rd_cycle; /* Total read cycle time */ + u32 wr_cycle; /* Total write cycle time */ + + u32 bus_turnaround; + u32 cycle2cycle_delay; + + u32 wait_monitoring; + u32 clk_activation; + + /* The following are only on OMAP3430 */ + u32 wr_access; /* WRACCESSTIME */ + u32 wr_data_mux_bus; /* WRDATAONADMUXBUS */ + + struct gpmc_bool_timings bool_timings; +}; + +/* Device timings in picoseconds */ +struct gpmc_device_timings { + u32 t_ceasu; /* address setup to CS valid */ + u32 t_avdasu; /* address setup to ADV valid */ + /* XXX: try to combine t_avdp_r & t_avdp_w. Issue is + * of tusb using these timings even for sync whilst + * ideally for adv_rd/(wr)_off it should have considered + * t_avdh instead. This indirectly necessitates r/w + * variations of t_avdp as it is possible to have one + * sync & other async + */ + u32 t_avdp_r; /* ADV low time (what about t_cer ?) */ + u32 t_avdp_w; + u32 t_aavdh; /* address hold time */ + u32 t_oeasu; /* address setup to OE valid */ + u32 t_aa; /* access time from ADV assertion */ + u32 t_iaa; /* initial access time */ + u32 t_oe; /* access time from OE assertion */ + u32 t_ce; /* access time from CS asertion */ + u32 t_rd_cycle; /* read cycle time */ + u32 t_cez_r; /* read CS deassertion to high Z */ + u32 t_cez_w; /* write CS deassertion to high Z */ + u32 t_oez; /* OE deassertion to high Z */ + u32 t_weasu; /* address setup to WE valid */ + u32 t_wpl; /* write assertion time */ + u32 t_wph; /* write deassertion time */ + u32 t_wr_cycle; /* write cycle time */ + + u32 clk; + u32 t_bacc; /* burst access valid clock to output delay */ + u32 t_ces; /* CS setup time to clk */ + u32 t_avds; /* ADV setup time to clk */ + u32 t_avdh; /* ADV hold time from clk */ + u32 t_ach; /* address hold time from clk */ + u32 t_rdyo; /* clk to ready valid */ + + u32 t_ce_rdyz; /* XXX: description ?, or use t_cez instead */ + u32 t_ce_avd; /* CS on to ADV on delay */ + + /* XXX: check the possibility of combining + * cyc_aavhd_oe & cyc_aavdh_we + */ + u8 cyc_aavdh_oe;/* read address hold time in cycles */ + u8 cyc_aavdh_we;/* write address hold time in cycles */ + u8 cyc_oe; /* access time from OE assertion in cycles */ + u8 cyc_wpl; /* write deassertion time in cycles */ + u32 cyc_iaa; /* initial access time in cycles */ + + /* extra delays */ + bool ce_xdelay; + bool avd_xdelay; + bool oe_xdelay; + bool we_xdelay; +}; + +#define GPMC_BURST_4 4 /* 4 word burst */ +#define GPMC_BURST_8 8 /* 8 word burst */ +#define GPMC_BURST_16 16 /* 16 word burst */ +#define GPMC_DEVWIDTH_8BIT 1 /* 8-bit device width */ +#define GPMC_DEVWIDTH_16BIT 2 /* 16-bit device width */ +#define GPMC_MUX_AAD 1 /* Addr-Addr-Data multiplex */ +#define GPMC_MUX_AD 2 /* Addr-Data multiplex */ + +struct gpmc_settings { + bool burst_wrap; /* enables wrap bursting */ + bool burst_read; /* enables read page/burst mode */ + bool burst_write; /* enables write page/burst mode */ + bool device_nand; /* device is NAND */ + bool sync_read; /* enables synchronous reads */ + bool sync_write; /* enables synchronous writes */ + bool wait_on_read; /* monitor wait on reads */ + bool wait_on_write; /* monitor wait on writes */ + u32 burst_len; /* page/burst length */ + u32 device_width; /* device bus width (8 or 16 bit) */ + u32 mux_add_data; /* multiplex address & data */ + u32 wait_pin; /* wait-pin to be used */ +}; diff --git a/include/linux/mtd/omap_gpmc.h b/include/linux/mtd/omap_gpmc.h index 864b05e432..f08e700a1d 100644 --- a/include/linux/mtd/omap_gpmc.h +++ b/include/linux/mtd/omap_gpmc.h @@ -8,6 +8,9 @@ #ifndef __ASM_OMAP_GPMC_H #define __ASM_OMAP_GPMC_H

+/* Maximum Number of Chip Selects */ +#define GPMC_CS_NUM 8 + #define GPMC_BUF_EMPTY 0 #define GPMC_BUF_FULL 1 #define GPMC_MAX_SECTORS 8