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omap-gpmc.c
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omap-gpmc.c
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/*
* GPMC support functions
*
* Copyright (C) 2005-2006 Nokia Corporation
*
* Author: Juha Yrjola
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_mtd.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/omap-gpmc.h>
#include <linux/mtd/nand.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/mtd-nand-omap2.h>
#include <linux/platform_data/mtd-onenand-omap2.h>
#include <asm/mach-types.h>
#define DEVICE_NAME "omap-gpmc"
/* 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_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
#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_SET_IRQ_STATUS 0x00000004
#define GPMC_CONFIG1_WRAPBURST_SUPP (1 << 31)
#define GPMC_CONFIG1_READMULTIPLE_SUPP (1 << 30)
#define GPMC_CONFIG1_READTYPE_ASYNC (0 << 29)
#define GPMC_CONFIG1_READTYPE_SYNC (1 << 29)
#define GPMC_CONFIG1_WRITEMULTIPLE_SUPP (1 << 28)
#define GPMC_CONFIG1_WRITETYPE_ASYNC (0 << 27)
#define GPMC_CONFIG1_WRITETYPE_SYNC (1 << 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 (1 << 22)
#define GPMC_CONFIG1_WAIT_WRITE_MON (1 << 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 (1 << 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 (1 << 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
#define GPMC_ENABLE_IRQ 0x0000000d
/* 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 */
/* XXX: Only NAND irq has been considered,currently these are the only ones used
*/
#define GPMC_NR_IRQ 2
enum gpmc_clk_domain {
GPMC_CD_FCLK,
GPMC_CD_CLK
};
struct gpmc_cs_data {
const char *name;
#define GPMC_CS_RESERVED (1 << 0)
u32 flags;
struct resource mem;
};
struct gpmc_client_irq {
unsigned irq;
u32 bitmask;
};
/* Structure to save gpmc cs context */
struct gpmc_cs_config {
u32 config1;
u32 config2;
u32 config3;
u32 config4;
u32 config5;
u32 config6;
u32 config7;
int is_valid;
};
/*
* Structure to save/restore gpmc context
* to support core off on OMAP3
*/
struct omap3_gpmc_regs {
u32 sysconfig;
u32 irqenable;
u32 timeout_ctrl;
u32 config;
u32 prefetch_config1;
u32 prefetch_config2;
u32 prefetch_control;
struct gpmc_cs_config cs_context[GPMC_CS_NUM];
};
static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ];
static struct irq_chip gpmc_irq_chip;
static int gpmc_irq_start;
static struct resource gpmc_mem_root;
static struct gpmc_cs_data gpmc_cs[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
/* Define chip-selects as reserved by default until probe completes */
static unsigned int gpmc_cs_num = GPMC_CS_NUM;
static unsigned int gpmc_nr_waitpins;
static struct device *gpmc_dev;
static int gpmc_irq;
static resource_size_t phys_base, mem_size;
static unsigned gpmc_capability;
static void __iomem *gpmc_base;
static struct clk *gpmc_l3_clk;
static irqreturn_t gpmc_handle_irq(int irq, void *dev);
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);
}
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);
}
/* TODO: Add support for gpmc_fck to clock framework and use it */
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:
/* FALL-THROUGH */
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;
}
unsigned int gpmc_clk_ticks_to_ns(unsigned ticks, int cs,
enum gpmc_clk_domain cd)
{
return ticks * gpmc_get_clk_period(cs, cd) / 1000;
}
unsigned int gpmc_ticks_to_ns(unsigned int ticks)
{
return gpmc_clk_ticks_to_ns(ticks, /* any CS */ 0, GPMC_CD_FCLK);
}
static unsigned int gpmc_ticks_to_ps(unsigned int ticks)
{
return ticks * gpmc_get_fclk_period();
}
static unsigned int gpmc_round_ps_to_ticks(unsigned int time_ps)
{
unsigned long ticks = gpmc_ps_to_ticks(time_ps);
return ticks * gpmc_get_fclk_period();
}
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_OEEXTRADELAY, 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);
}
#ifdef CONFIG_OMAP_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.
* @ma:x 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> /‍* x ns -- y ns; x ticks *‍/
* 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_MAX(GPMC_CS_CONFIG1, 12, 13,
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");
GPMC_GET_TICKS(GPMC_CS_CONFIG4, 0, 3, "oe-on-ns");
GPMC_GET_TICKS(GPMC_CS_CONFIG4, 8, 12, "oe-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);
#ifdef CONFIG_OMAP_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;
}
#define GPMC_SET_ONE_CD_MAX(reg, st, end, max, field, cd) \
if (set_gpmc_timing_reg(cs, (reg), (st), (end), (max), \
t->field, (cd), #field) < 0) \
return -1
#define GPMC_SET_ONE(reg, st, end, field) \
GPMC_SET_ONE_CD_MAX(reg, st, end, 0, field, GPMC_CD_FCLK)
/**
* 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.
*/
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.
*/
int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t,
const struct gpmc_settings *s)
{
int div;
u32 l;
gpmc_cs_show_timings(cs, "before gpmc_cs_set_timings");
div = gpmc_calc_divider(t->sync_clk);
if (div < 0)
return div;
/*
* 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 -1;
}
}
GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
GPMC_SET_ONE(GPMC_CS_CONFIG6, 0, 3, bus_turnaround);
GPMC_SET_ONE(GPMC_CS_CONFIG6, 8, 11, cycle2cycle_delay);
if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
if (gpmc_capability & GPMC_HAS_WR_ACCESS)
GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
l &= ~0x03;
l |= (div - 1);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 18, 19,
GPMC_CONFIG1_WAITMONITORINGTIME_MAX,
wait_monitoring, GPMC_CD_CLK);
GPMC_SET_ONE_CD_MAX(GPMC_CS_CONFIG1, 25, 26,
GPMC_CONFIG1_CLKACTIVATIONTIME_MAX,
clk_activation, GPMC_CD_FCLK);
#ifdef CONFIG_OMAP_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, u32 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_get_memconf(int cs, u32 *base, u32 *size)
{
u32 l;
u32 mask;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
*base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
mask = (l >> 8) & 0x0f;
*size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
}
static int gpmc_cs_mem_enabled(int cs)
{
u32 l;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
return l & GPMC_CONFIG7_CSVALID;
}
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 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;
}
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_insert_mem(int cs, unsigned long base, unsigned long size)
{
struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
struct resource *res = &gpmc->mem;
int r;
size = gpmc_mem_align(size);
spin_lock(&gpmc_mem_lock);
res->start = base;
res->end = base + size - 1;
r = request_resource(&gpmc_mem_root, res);
spin_unlock(&gpmc_mem_lock);
return r;
}
static int gpmc_cs_delete_mem(int cs)
{
struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
struct resource *res = &gpmc->mem;
int r;
spin_lock(&gpmc_mem_lock);
r = release_resource(res);
res->start = 0;
res->end = 0;
spin_unlock(&gpmc_mem_lock);
return r;
}
/**
* gpmc_cs_remap - remaps a chip-select physical base address
* @cs: chip-select to remap
* @base: physical base address to re-map chip-select to
*
* Re-maps a chip-select to a new physical base address specified by
* "base". Returns 0 on success and appropriate negative error code
* on failure.
*/
static int gpmc_cs_remap(int cs, u32 base)
{
int ret;
u32 old_base, size;
if (cs > gpmc_cs_num) {
pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
}
/*
* Make sure we ignore any device offsets from the GPMC partition
* allocated for the chip select and that the new base confirms
* to the GPMC 16MB minimum granularity.
*/
base &= ~(SZ_16M - 1);
gpmc_cs_get_memconf(cs, &old_base, &size);
if (base == old_base)
return 0;
ret = gpmc_cs_delete_mem(cs);
if (ret < 0)
return ret;
ret = gpmc_cs_insert_mem(cs, base, size);
if (ret < 0)
return ret;
ret = gpmc_cs_set_memconf(cs, base, size);
return ret;
}
int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
{
struct gpmc_cs_data *gpmc = &gpmc_cs[cs];
struct resource *res = &gpmc->mem;
int r = -1;
if (cs > gpmc_cs_num) {
pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
}
size = gpmc_mem_align(size);
if (size > (1 << GPMC_SECTION_SHIFT))
return -ENOMEM;
spin_lock(&gpmc_mem_lock);
if (gpmc_cs_reserved(cs)) {
r = -EBUSY;
goto out;
}
if (gpmc_cs_mem_enabled(cs))
r = adjust_resource(res, res->start & ~(size - 1), size);
if (r < 0)
r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
size, NULL, NULL);
if (r < 0)
goto out;
/* Disable CS while changing base address and size mask */
gpmc_cs_disable_mem(cs);
r = gpmc_cs_set_memconf(cs, res->start, resource_size(res));
if (r < 0) {
release_resource(res);
goto out;
}
/* Enable CS */
gpmc_cs_enable_mem(cs);
*base = res->start;
gpmc_cs_set_reserved(cs, 1);