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u-boot/drivers/memory/ti-gpmc.c
Roger Quadros 9b0b5648d6 memory: Add TI GPMC driver 
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>
2022-10-26 15:21:12 -04:00

1240 lines
34 KiB
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// 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;
static unsigned int gpmc_capability;
static void __iomem *gpmc_base;
static struct clk *gpmc_l3_clk;
/* Public, as required by nand/raw/omap_gpmc.c */
const struct gpmc *gpmc_cfg;
/*
* 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);
}
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);
}
gpmc_cs_bool_timings(cs, &t->bool_timings);
gpmc_cs_show_timings(cs, "after gpmc_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_MEMORY,
.of_match = gpmc_dt_ids,
.probe = gpmc_probe,
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
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