![Linus Torvalds](/assets/img/avatar_default.png)
- Fix a regression in leds-gpio introduced by a recent commit that inadvertently changed the name of one of the properties used by the driver (Fabio Estevam). - Fix a regression in the ACPI backlight driver introduced by a recent fix that missed one special case that had to be taken into account (Aaron Lu). - Drop the level of some new kernel messages from the ACPI core introduced by a recent commit to KERN_DEBUG which they should have used from the start and drop some other unuseful KERN_ERR messages printed by ACPI (Rafael J Wysocki). - Revert an incorrect commit modifying the cpupower tool (Prarit Bhargava). - Fix two regressions introduced by recent commits in the OPP library and clean up some existing minor issues in that code (Viresh Kumar). - Continue to replace CONFIG_PM_RUNTIME with CONFIG_PM throughout the tree (or drop it where that can be done) in order to make it possible to eliminate CONFIG_PM_RUNTIME (Rafael J Wysocki, Ulf Hansson, Ludovic Desroches). There will be one more "CONFIG_PM_RUNTIME removal" batch after this one, because some new uses of it have been introduced during the current merge window, but that should be sufficient to finally get rid of it. - Make the ACPI EC driver more robust against race conditions related to GPE handler installation failures (Lv Zheng). - Prevent the ACPI device PM core code from attempting to disable GPEs that it has not enabled which confuses ACPICA and makes it report errors unnecessarily (Rafael J Wysocki). - Add a "force" command line switch to the intel_pstate driver to make it possible to override the blacklisting of some systems in that driver if needed (Ethan Zhao). - Improve intel_pstate code documentation and add a MAINTAINERS entry for it (Kristen Carlson Accardi). - Make the ACPI fan driver create cooling device interfaces witn names that reflect the IDs of the ACPI device objects they are associated with, except for "generic" ACPI fans (PNP ID "PNP0C0B"). That's necessary for user space thermal management tools to be able to connect the fans with the parts of the system they are supposed to be cooling properly. From Srinivas Pandruvada. / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJUk0IDAAoJEILEb/54YlRx7fgP/3+yF/0TnEW93j2ALDAQFiLF tSv2A2vQC8vtMJjjWx0z/HqPh86gfaReEFZmUJD/Q/e2LXEnxNZJ+QMjcekPVkDM mTvcIMc2MR8vOA/oMkgxeaKregrrx7RkCfojd+NWZhVukkjl+mvBHgAnYjXRL+NZ unDWGlbHG97vq/3kGjPYhDS00nxHblw8NHFBu5HL5RxwABdWoeZJITwqxXWyuPLw nlqNWlOxmwvtSbw2VMKz0uof1nFHyQLykYsMG0ZsyayCRdWUZYkEqmE7GGpCLkLu D6yfmlpen6ccIOsEAae0eXBt50IFY9Tihk5lovx1mZmci2SNRg29BqMI105wIn0u 8b8Ej7MNHp7yMxRpB5WfU90p/y7ioJns9guFZxY0CKaRnrI2+BLt3RscMi3MPI06 Cu2/WkSSa09fhDPA+pk+VDYsmWgyVawigesNmMP5/cvYO/yYywVRjOuO1k77qQGp 4dSpFYEHfpxinejZnVZOk2V9MkvSLoSMux6wPV0xM0IE1iD0ulVpHjTJrwp80ph4 +bfUFVr/vrD1y7EKbf1PD363ZKvJhWhvQWDgETsM1vgLf21PfWO7C2kflIAsWsdQ 1ukD5nCBRlP4K73hG7bdM6kRztXhUdR0SHg85/t0KB/ExiVqtcXIzB60D0G1lENd QlKbq3O4lim1WGuhazQY =5fo2 -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull more ACPI and power management updates from Rafael Wysocki: "These are regression fixes (leds-gpio, ACPI backlight driver, operating performance points library, ACPI device enumeration messages, cpupower tool), other bug fixes (ACPI EC driver, ACPI device PM), some cleanups in the operating performance points (OPP) framework, continuation of CONFIG_PM_RUNTIME elimination, a couple of minor intel_pstate driver changes, a new MAINTAINERS entry for it and an ACPI fan driver change needed for better support of thermal management in user space. Specifics: - Fix a regression in leds-gpio introduced by a recent commit that inadvertently changed the name of one of the properties used by the driver (Fabio Estevam). - Fix a regression in the ACPI backlight driver introduced by a recent fix that missed one special case that had to be taken into account (Aaron Lu). - Drop the level of some new kernel messages from the ACPI core introduced by a recent commit to KERN_DEBUG which they should have used from the start and drop some other unuseful KERN_ERR messages printed by ACPI (Rafael J Wysocki). - Revert an incorrect commit modifying the cpupower tool (Prarit Bhargava). - Fix two regressions introduced by recent commits in the OPP library and clean up some existing minor issues in that code (Viresh Kumar). - Continue to replace CONFIG_PM_RUNTIME with CONFIG_PM throughout the tree (or drop it where that can be done) in order to make it possible to eliminate CONFIG_PM_RUNTIME (Rafael J Wysocki, Ulf Hansson, Ludovic Desroches). There will be one more "CONFIG_PM_RUNTIME removal" batch after this one, because some new uses of it have been introduced during the current merge window, but that should be sufficient to finally get rid of it. - Make the ACPI EC driver more robust against race conditions related to GPE handler installation failures (Lv Zheng). - Prevent the ACPI device PM core code from attempting to disable GPEs that it has not enabled which confuses ACPICA and makes it report errors unnecessarily (Rafael J Wysocki). - Add a "force" command line switch to the intel_pstate driver to make it possible to override the blacklisting of some systems in that driver if needed (Ethan Zhao). - Improve intel_pstate code documentation and add a MAINTAINERS entry for it (Kristen Carlson Accardi). - Make the ACPI fan driver create cooling device interfaces witn names that reflect the IDs of the ACPI device objects they are associated with, except for "generic" ACPI fans (PNP ID "PNP0C0B"). That's necessary for user space thermal management tools to be able to connect the fans with the parts of the system they are supposed to be cooling properly. From Srinivas Pandruvada" * tag 'pm+acpi-3.19-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits) MAINTAINERS: add entry for intel_pstate ACPI / video: update the skip case for acpi_video_device_in_dod() power / PM: Eliminate CONFIG_PM_RUNTIME NFC / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM SCSI / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM ACPI / EC: Fix unexpected ec_remove_handlers() invocations Revert "tools: cpupower: fix return checks for sysfs_get_idlestate_count()" tracing / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM x86 / PM: Replace CONFIG_PM_RUNTIME in io_apic.c PM: Remove the SET_PM_RUNTIME_PM_OPS() macro mmc: atmel-mci: use SET_RUNTIME_PM_OPS() macro PM / Kconfig: Replace PM_RUNTIME with PM in dependencies ARM / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM sound / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM phy / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM video / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM tty / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM spi: Replace CONFIG_PM_RUNTIME with CONFIG_PM ACPI / PM: Do not disable wakeup GPEs that have not been enabled ACPI / utils: Drop error messages from acpi_evaluate_reference() ...
566 lines
13 KiB
C
566 lines
13 KiB
C
/*
|
|
* Marvell Orion SPI controller driver
|
|
*
|
|
* Author: Shadi Ammouri <shadi@marvell.com>
|
|
* Copyright (C) 2007-2008 Marvell Ltd.
|
|
*
|
|
* 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/interrupt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/sizes.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#define DRIVER_NAME "orion_spi"
|
|
|
|
/* Runtime PM autosuspend timeout: PM is fairly light on this driver */
|
|
#define SPI_AUTOSUSPEND_TIMEOUT 200
|
|
|
|
#define ORION_NUM_CHIPSELECTS 1 /* only one slave is supported*/
|
|
#define ORION_SPI_WAIT_RDY_MAX_LOOP 2000 /* in usec */
|
|
|
|
#define ORION_SPI_IF_CTRL_REG 0x00
|
|
#define ORION_SPI_IF_CONFIG_REG 0x04
|
|
#define ORION_SPI_DATA_OUT_REG 0x08
|
|
#define ORION_SPI_DATA_IN_REG 0x0c
|
|
#define ORION_SPI_INT_CAUSE_REG 0x10
|
|
|
|
#define ORION_SPI_MODE_CPOL (1 << 11)
|
|
#define ORION_SPI_MODE_CPHA (1 << 12)
|
|
#define ORION_SPI_IF_8_16_BIT_MODE (1 << 5)
|
|
#define ORION_SPI_CLK_PRESCALE_MASK 0x1F
|
|
#define ARMADA_SPI_CLK_PRESCALE_MASK 0xDF
|
|
#define ORION_SPI_MODE_MASK (ORION_SPI_MODE_CPOL | \
|
|
ORION_SPI_MODE_CPHA)
|
|
|
|
enum orion_spi_type {
|
|
ORION_SPI,
|
|
ARMADA_SPI,
|
|
};
|
|
|
|
struct orion_spi_dev {
|
|
enum orion_spi_type typ;
|
|
unsigned int min_divisor;
|
|
unsigned int max_divisor;
|
|
u32 prescale_mask;
|
|
};
|
|
|
|
struct orion_spi {
|
|
struct spi_master *master;
|
|
void __iomem *base;
|
|
struct clk *clk;
|
|
const struct orion_spi_dev *devdata;
|
|
};
|
|
|
|
static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
|
|
{
|
|
return orion_spi->base + reg;
|
|
}
|
|
|
|
static inline void
|
|
orion_spi_setbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
|
|
{
|
|
void __iomem *reg_addr = spi_reg(orion_spi, reg);
|
|
u32 val;
|
|
|
|
val = readl(reg_addr);
|
|
val |= mask;
|
|
writel(val, reg_addr);
|
|
}
|
|
|
|
static inline void
|
|
orion_spi_clrbits(struct orion_spi *orion_spi, u32 reg, u32 mask)
|
|
{
|
|
void __iomem *reg_addr = spi_reg(orion_spi, reg);
|
|
u32 val;
|
|
|
|
val = readl(reg_addr);
|
|
val &= ~mask;
|
|
writel(val, reg_addr);
|
|
}
|
|
|
|
static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
|
|
{
|
|
u32 tclk_hz;
|
|
u32 rate;
|
|
u32 prescale;
|
|
u32 reg;
|
|
struct orion_spi *orion_spi;
|
|
const struct orion_spi_dev *devdata;
|
|
|
|
orion_spi = spi_master_get_devdata(spi->master);
|
|
devdata = orion_spi->devdata;
|
|
|
|
tclk_hz = clk_get_rate(orion_spi->clk);
|
|
|
|
if (devdata->typ == ARMADA_SPI) {
|
|
unsigned int clk, spr, sppr, sppr2, err;
|
|
unsigned int best_spr, best_sppr, best_err;
|
|
|
|
best_err = speed;
|
|
best_spr = 0;
|
|
best_sppr = 0;
|
|
|
|
/* Iterate over the valid range looking for best fit */
|
|
for (sppr = 0; sppr < 8; sppr++) {
|
|
sppr2 = 0x1 << sppr;
|
|
|
|
spr = tclk_hz / sppr2;
|
|
spr = DIV_ROUND_UP(spr, speed);
|
|
if ((spr == 0) || (spr > 15))
|
|
continue;
|
|
|
|
clk = tclk_hz / (spr * sppr2);
|
|
err = speed - clk;
|
|
|
|
if (err < best_err) {
|
|
best_spr = spr;
|
|
best_sppr = sppr;
|
|
best_err = err;
|
|
}
|
|
}
|
|
|
|
if ((best_sppr == 0) && (best_spr == 0))
|
|
return -EINVAL;
|
|
|
|
prescale = ((best_sppr & 0x6) << 5) |
|
|
((best_sppr & 0x1) << 4) | best_spr;
|
|
} else {
|
|
/*
|
|
* the supported rates are: 4,6,8...30
|
|
* round up as we look for equal or less speed
|
|
*/
|
|
rate = DIV_ROUND_UP(tclk_hz, speed);
|
|
rate = roundup(rate, 2);
|
|
|
|
/* check if requested speed is too small */
|
|
if (rate > 30)
|
|
return -EINVAL;
|
|
|
|
if (rate < 4)
|
|
rate = 4;
|
|
|
|
/* Convert the rate to SPI clock divisor value. */
|
|
prescale = 0x10 + rate/2;
|
|
}
|
|
|
|
reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
|
|
reg = ((reg & ~devdata->prescale_mask) | prescale);
|
|
writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
orion_spi_mode_set(struct spi_device *spi)
|
|
{
|
|
u32 reg;
|
|
struct orion_spi *orion_spi;
|
|
|
|
orion_spi = spi_master_get_devdata(spi->master);
|
|
|
|
reg = readl(spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
|
|
reg &= ~ORION_SPI_MODE_MASK;
|
|
if (spi->mode & SPI_CPOL)
|
|
reg |= ORION_SPI_MODE_CPOL;
|
|
if (spi->mode & SPI_CPHA)
|
|
reg |= ORION_SPI_MODE_CPHA;
|
|
writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
|
|
}
|
|
|
|
/*
|
|
* called only when no transfer is active on the bus
|
|
*/
|
|
static int
|
|
orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
|
|
{
|
|
struct orion_spi *orion_spi;
|
|
unsigned int speed = spi->max_speed_hz;
|
|
unsigned int bits_per_word = spi->bits_per_word;
|
|
int rc;
|
|
|
|
orion_spi = spi_master_get_devdata(spi->master);
|
|
|
|
if ((t != NULL) && t->speed_hz)
|
|
speed = t->speed_hz;
|
|
|
|
if ((t != NULL) && t->bits_per_word)
|
|
bits_per_word = t->bits_per_word;
|
|
|
|
orion_spi_mode_set(spi);
|
|
|
|
rc = orion_spi_baudrate_set(spi, speed);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (bits_per_word == 16)
|
|
orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
|
|
ORION_SPI_IF_8_16_BIT_MODE);
|
|
else
|
|
orion_spi_clrbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
|
|
ORION_SPI_IF_8_16_BIT_MODE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void orion_spi_set_cs(struct orion_spi *orion_spi, int enable)
|
|
{
|
|
if (enable)
|
|
orion_spi_setbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
|
|
else
|
|
orion_spi_clrbits(orion_spi, ORION_SPI_IF_CTRL_REG, 0x1);
|
|
}
|
|
|
|
static inline int orion_spi_wait_till_ready(struct orion_spi *orion_spi)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ORION_SPI_WAIT_RDY_MAX_LOOP; i++) {
|
|
if (readl(spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG)))
|
|
return 1;
|
|
|
|
udelay(1);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static inline int
|
|
orion_spi_write_read_8bit(struct spi_device *spi,
|
|
const u8 **tx_buf, u8 **rx_buf)
|
|
{
|
|
void __iomem *tx_reg, *rx_reg, *int_reg;
|
|
struct orion_spi *orion_spi;
|
|
|
|
orion_spi = spi_master_get_devdata(spi->master);
|
|
tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
|
|
rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
|
|
int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
|
|
|
|
/* clear the interrupt cause register */
|
|
writel(0x0, int_reg);
|
|
|
|
if (tx_buf && *tx_buf)
|
|
writel(*(*tx_buf)++, tx_reg);
|
|
else
|
|
writel(0, tx_reg);
|
|
|
|
if (orion_spi_wait_till_ready(orion_spi) < 0) {
|
|
dev_err(&spi->dev, "TXS timed out\n");
|
|
return -1;
|
|
}
|
|
|
|
if (rx_buf && *rx_buf)
|
|
*(*rx_buf)++ = readl(rx_reg);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int
|
|
orion_spi_write_read_16bit(struct spi_device *spi,
|
|
const u16 **tx_buf, u16 **rx_buf)
|
|
{
|
|
void __iomem *tx_reg, *rx_reg, *int_reg;
|
|
struct orion_spi *orion_spi;
|
|
|
|
orion_spi = spi_master_get_devdata(spi->master);
|
|
tx_reg = spi_reg(orion_spi, ORION_SPI_DATA_OUT_REG);
|
|
rx_reg = spi_reg(orion_spi, ORION_SPI_DATA_IN_REG);
|
|
int_reg = spi_reg(orion_spi, ORION_SPI_INT_CAUSE_REG);
|
|
|
|
/* clear the interrupt cause register */
|
|
writel(0x0, int_reg);
|
|
|
|
if (tx_buf && *tx_buf)
|
|
writel(__cpu_to_le16(get_unaligned((*tx_buf)++)), tx_reg);
|
|
else
|
|
writel(0, tx_reg);
|
|
|
|
if (orion_spi_wait_till_ready(orion_spi) < 0) {
|
|
dev_err(&spi->dev, "TXS timed out\n");
|
|
return -1;
|
|
}
|
|
|
|
if (rx_buf && *rx_buf)
|
|
put_unaligned(__le16_to_cpu(readl(rx_reg)), (*rx_buf)++);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int
|
|
orion_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
|
|
{
|
|
unsigned int count;
|
|
int word_len;
|
|
|
|
word_len = spi->bits_per_word;
|
|
count = xfer->len;
|
|
|
|
if (word_len == 8) {
|
|
const u8 *tx = xfer->tx_buf;
|
|
u8 *rx = xfer->rx_buf;
|
|
|
|
do {
|
|
if (orion_spi_write_read_8bit(spi, &tx, &rx) < 0)
|
|
goto out;
|
|
count--;
|
|
} while (count);
|
|
} else if (word_len == 16) {
|
|
const u16 *tx = xfer->tx_buf;
|
|
u16 *rx = xfer->rx_buf;
|
|
|
|
do {
|
|
if (orion_spi_write_read_16bit(spi, &tx, &rx) < 0)
|
|
goto out;
|
|
count -= 2;
|
|
} while (count);
|
|
}
|
|
|
|
out:
|
|
return xfer->len - count;
|
|
}
|
|
|
|
static int orion_spi_transfer_one_message(struct spi_master *master,
|
|
struct spi_message *m)
|
|
{
|
|
struct orion_spi *orion_spi = spi_master_get_devdata(master);
|
|
struct spi_device *spi = m->spi;
|
|
struct spi_transfer *t = NULL;
|
|
int par_override = 0;
|
|
int status = 0;
|
|
int cs_active = 0;
|
|
|
|
/* Load defaults */
|
|
status = orion_spi_setup_transfer(spi, NULL);
|
|
|
|
if (status < 0)
|
|
goto msg_done;
|
|
|
|
list_for_each_entry(t, &m->transfers, transfer_list) {
|
|
if (par_override || t->speed_hz || t->bits_per_word) {
|
|
par_override = 1;
|
|
status = orion_spi_setup_transfer(spi, t);
|
|
if (status < 0)
|
|
break;
|
|
if (!t->speed_hz && !t->bits_per_word)
|
|
par_override = 0;
|
|
}
|
|
|
|
if (!cs_active) {
|
|
orion_spi_set_cs(orion_spi, 1);
|
|
cs_active = 1;
|
|
}
|
|
|
|
if (t->len)
|
|
m->actual_length += orion_spi_write_read(spi, t);
|
|
|
|
if (t->delay_usecs)
|
|
udelay(t->delay_usecs);
|
|
|
|
if (t->cs_change) {
|
|
orion_spi_set_cs(orion_spi, 0);
|
|
cs_active = 0;
|
|
}
|
|
}
|
|
|
|
msg_done:
|
|
if (cs_active)
|
|
orion_spi_set_cs(orion_spi, 0);
|
|
|
|
m->status = status;
|
|
spi_finalize_current_message(master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int orion_spi_reset(struct orion_spi *orion_spi)
|
|
{
|
|
/* Verify that the CS is deasserted */
|
|
orion_spi_set_cs(orion_spi, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct orion_spi_dev orion_spi_dev_data = {
|
|
.typ = ORION_SPI,
|
|
.min_divisor = 4,
|
|
.max_divisor = 30,
|
|
.prescale_mask = ORION_SPI_CLK_PRESCALE_MASK,
|
|
};
|
|
|
|
static const struct orion_spi_dev armada_spi_dev_data = {
|
|
.typ = ARMADA_SPI,
|
|
.min_divisor = 1,
|
|
.max_divisor = 1920,
|
|
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
|
|
};
|
|
|
|
static const struct of_device_id orion_spi_of_match_table[] = {
|
|
{ .compatible = "marvell,orion-spi", .data = &orion_spi_dev_data, },
|
|
{ .compatible = "marvell,armada-370-spi", .data = &armada_spi_dev_data, },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, orion_spi_of_match_table);
|
|
|
|
static int orion_spi_probe(struct platform_device *pdev)
|
|
{
|
|
const struct of_device_id *of_id;
|
|
const struct orion_spi_dev *devdata;
|
|
struct spi_master *master;
|
|
struct orion_spi *spi;
|
|
struct resource *r;
|
|
unsigned long tclk_hz;
|
|
int status = 0;
|
|
|
|
master = spi_alloc_master(&pdev->dev, sizeof(*spi));
|
|
if (master == NULL) {
|
|
dev_dbg(&pdev->dev, "master allocation failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (pdev->id != -1)
|
|
master->bus_num = pdev->id;
|
|
if (pdev->dev.of_node) {
|
|
u32 cell_index;
|
|
|
|
if (!of_property_read_u32(pdev->dev.of_node, "cell-index",
|
|
&cell_index))
|
|
master->bus_num = cell_index;
|
|
}
|
|
|
|
/* we support only mode 0, and no options */
|
|
master->mode_bits = SPI_CPHA | SPI_CPOL;
|
|
|
|
master->transfer_one_message = orion_spi_transfer_one_message;
|
|
master->num_chipselect = ORION_NUM_CHIPSELECTS;
|
|
master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
|
|
master->auto_runtime_pm = true;
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
|
|
spi = spi_master_get_devdata(master);
|
|
spi->master = master;
|
|
|
|
of_id = of_match_device(orion_spi_of_match_table, &pdev->dev);
|
|
devdata = (of_id) ? of_id->data : &orion_spi_dev_data;
|
|
spi->devdata = devdata;
|
|
|
|
spi->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(spi->clk)) {
|
|
status = PTR_ERR(spi->clk);
|
|
goto out;
|
|
}
|
|
|
|
status = clk_prepare_enable(spi->clk);
|
|
if (status)
|
|
goto out;
|
|
|
|
tclk_hz = clk_get_rate(spi->clk);
|
|
master->max_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->min_divisor);
|
|
master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor);
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
spi->base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(spi->base)) {
|
|
status = PTR_ERR(spi->base);
|
|
goto out_rel_clk;
|
|
}
|
|
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_use_autosuspend(&pdev->dev);
|
|
pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
status = orion_spi_reset(spi);
|
|
if (status < 0)
|
|
goto out_rel_pm;
|
|
|
|
pm_runtime_mark_last_busy(&pdev->dev);
|
|
pm_runtime_put_autosuspend(&pdev->dev);
|
|
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
status = spi_register_master(master);
|
|
if (status < 0)
|
|
goto out_rel_pm;
|
|
|
|
return status;
|
|
|
|
out_rel_pm:
|
|
pm_runtime_disable(&pdev->dev);
|
|
out_rel_clk:
|
|
clk_disable_unprepare(spi->clk);
|
|
out:
|
|
spi_master_put(master);
|
|
return status;
|
|
}
|
|
|
|
|
|
static int orion_spi_remove(struct platform_device *pdev)
|
|
{
|
|
struct spi_master *master = platform_get_drvdata(pdev);
|
|
struct orion_spi *spi = spi_master_get_devdata(master);
|
|
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
clk_disable_unprepare(spi->clk);
|
|
|
|
spi_unregister_master(master);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
|
|
#ifdef CONFIG_PM
|
|
static int orion_spi_runtime_suspend(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct orion_spi *spi = spi_master_get_devdata(master);
|
|
|
|
clk_disable_unprepare(spi->clk);
|
|
return 0;
|
|
}
|
|
|
|
static int orion_spi_runtime_resume(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct orion_spi *spi = spi_master_get_devdata(master);
|
|
|
|
return clk_prepare_enable(spi->clk);
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops orion_spi_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(orion_spi_runtime_suspend,
|
|
orion_spi_runtime_resume,
|
|
NULL)
|
|
};
|
|
|
|
static struct platform_driver orion_spi_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.pm = &orion_spi_pm_ops,
|
|
.of_match_table = of_match_ptr(orion_spi_of_match_table),
|
|
},
|
|
.probe = orion_spi_probe,
|
|
.remove = orion_spi_remove,
|
|
};
|
|
|
|
module_platform_driver(orion_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("Orion SPI driver");
|
|
MODULE_AUTHOR("Shadi Ammouri <shadi@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|