[RFC PATCH 03/10] i2c: mmc: add nexell driver (gpio, i2c, mmc, pwm)
Stefan Bosch
stefan_b at posteo.net
Mon Feb 3 21:40:12 CET 2020
Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- i2c/nx_i2c.c: Some adaptions mainly because of changes in
"struct udevice".
- mmc: nexell_dw_mmc.c changed to nexell_dw_mmc_dm.c (switched to DM).
Signed-off-by: Stefan Bosch <stefan_b at posteo.net>
---
drivers/gpio/Kconfig | 9 +
drivers/gpio/Makefile | 1 +
drivers/gpio/nx_gpio.c | 252 +++++++++++++++++++
drivers/i2c/Kconfig | 9 +
drivers/i2c/Makefile | 1 +
drivers/i2c/nx_i2c.c | 537 +++++++++++++++++++++++++++++++++++++++++
drivers/mmc/Kconfig | 6 +
drivers/mmc/Makefile | 1 +
drivers/mmc/nexell_dw_mmc_dm.c | 350 +++++++++++++++++++++++++++
drivers/pwm/Makefile | 1 +
drivers/pwm/pwm-nexell.c | 252 +++++++++++++++++++
drivers/pwm/pwm-nexell.h | 54 +++++
12 files changed, 1473 insertions(+)
create mode 100644 drivers/gpio/nx_gpio.c
create mode 100644 drivers/i2c/nx_i2c.c
create mode 100644 drivers/mmc/nexell_dw_mmc_dm.c
create mode 100644 drivers/pwm/pwm-nexell.c
create mode 100644 drivers/pwm/pwm-nexell.h
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 1de6f52..febda89 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -421,4 +421,13 @@ config MT7621_GPIO
help
Say yes here to support MediaTek MT7621 compatible GPIOs.
+config NX_GPIO
+ bool "Nexell GPIO driver"
+ depends on DM_GPIO
+ help
+ Support GPIO access on Nexell SoCs. The GPIOs are arranged into
+ a number of banks (different for each SoC type) each with 32 GPIOs.
+ The GPIOs for a device are defined in the device tree with one node
+ for each bank.
+
endmenu
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 449046b..e3340de 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -65,3 +65,4 @@ obj-$(CONFIG_PM8916_GPIO) += pm8916_gpio.o
obj-$(CONFIG_MT7621_GPIO) += mt7621_gpio.o
obj-$(CONFIG_MSCC_SGPIO) += mscc_sgpio.o
obj-$(CONFIG_SIFIVE_GPIO) += sifive-gpio.o
+obj-$(CONFIG_NX_GPIO) += nx_gpio.o
diff --git a/drivers/gpio/nx_gpio.c b/drivers/gpio/nx_gpio.c
new file mode 100644
index 0000000..86472f6
--- /dev/null
+++ b/drivers/gpio/nx_gpio.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * DeokJin, Lee <truevirtue at nexell.co.kr>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <fdtdec.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct nx_gpio_regs {
+ u32 data; /* Data register */
+ u32 outputenb; /* Output Enable register */
+ u32 detmode[2]; /* Detect Mode Register */
+ u32 intenb; /* Interrupt Enable Register */
+ u32 det; /* Event Detect Register */
+ u32 pad; /* Pad Status Register */
+};
+
+struct nx_alive_gpio_regs {
+ u32 pwrgate; /* Power Gating Register */
+ u32 reserved0[28]; /* Reserved0 */
+ u32 outputenb_reset;/* Alive GPIO Output Enable Reset Register */
+ u32 outputenb; /* Alive GPIO Output Enable Register */
+ u32 outputenb_read; /* Alive GPIO Output Read Register */
+ u32 reserved1[3]; /* Reserved1 */
+ u32 pad_reset; /* Alive GPIO Output Reset Register */
+ u32 data; /* Alive GPIO Output Register */
+ u32 pad_read; /* Alive GPIO Pad Read Register */
+ u32 reserved2[33]; /* Reserved2 */
+ u32 pad; /* Alive GPIO Input Value Register */
+};
+
+struct nx_gpio_platdata {
+ void *regs;
+ int gpio_count;
+ const char *bank_name;
+};
+
+static int nx_alive_gpio_is_check(struct udevice *dev)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ const char *bank_name = plat->bank_name;
+
+ if (!strcmp(bank_name, "gpio_alv"))
+ return 1;
+
+ return 0;
+}
+
+static int nx_alive_gpio_direction_input(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ setbits_le32(®s->outputenb_reset, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_direction_output(struct udevice *dev, unsigned int pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ setbits_le32(®s->pad_reset, 1 << pin);
+
+ setbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_get_value(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+ unsigned int mask = 1UL << pin;
+ unsigned int value;
+
+ value = (readl(®s->pad_read) & mask) >> pin;
+
+ return value;
+}
+
+static int nx_alive_gpio_set_value(struct udevice *dev, unsigned int pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->pad_reset, 1 << pin);
+
+ return 0;
+}
+
+static int nx_alive_gpio_get_function(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_alive_gpio_regs *const regs = plat->regs;
+ unsigned int mask = (1UL << pin);
+ unsigned int output;
+
+ output = readl(®s->outputenb_read) & mask;
+
+ if (output)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int nx_gpio_direction_input(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_direction_input(dev, pin);
+
+ clrbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_direction_output(struct udevice *dev, unsigned int pin,
+ int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_direction_output(dev, pin, val);
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->data, 1 << pin);
+
+ setbits_le32(®s->outputenb, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_get_value(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+ unsigned int mask = 1UL << pin;
+ unsigned int value;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_get_value(dev, pin);
+
+ value = (readl(®s->pad) & mask) >> pin;
+
+ return value;
+}
+
+static int nx_gpio_set_value(struct udevice *dev, unsigned int pin, int val)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_set_value(dev, pin, val);
+
+ if (val)
+ setbits_le32(®s->data, 1 << pin);
+ else
+ clrbits_le32(®s->data, 1 << pin);
+
+ return 0;
+}
+
+static int nx_gpio_get_function(struct udevice *dev, unsigned int pin)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+ struct nx_gpio_regs *const regs = plat->regs;
+ unsigned int mask = (1UL << pin);
+ unsigned int output;
+
+ if (nx_alive_gpio_is_check(dev))
+ return nx_alive_gpio_get_function(dev, pin);
+
+ output = readl(®s->outputenb) & mask;
+
+ if (output)
+ return GPIOF_OUTPUT;
+ else
+ return GPIOF_INPUT;
+}
+
+static int nx_gpio_probe(struct udevice *dev)
+{
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+
+ uc_priv->gpio_count = plat->gpio_count;
+ uc_priv->bank_name = plat->bank_name;
+
+ return 0;
+}
+
+static int nx_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct nx_gpio_platdata *plat = dev_get_platdata(dev);
+
+ plat->regs = map_physmem(devfdt_get_addr(dev),
+ sizeof(struct nx_gpio_regs),
+ MAP_NOCACHE);
+ plat->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->node.of_offset,
+ "nexell,gpio-bank-width", 32);
+ plat->bank_name = fdt_getprop(gd->fdt_blob, dev->node.of_offset,
+ "gpio-bank-name", NULL);
+
+ return 0;
+}
+
+static const struct dm_gpio_ops nx_gpio_ops = {
+ .direction_input = nx_gpio_direction_input,
+ .direction_output = nx_gpio_direction_output,
+ .get_value = nx_gpio_get_value,
+ .set_value = nx_gpio_set_value,
+ .get_function = nx_gpio_get_function,
+};
+
+static const struct udevice_id nx_gpio_ids[] = {
+ { .compatible = "nexell,nexell-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(nx_gpio) = {
+ .name = "nx_gpio",
+ .id = UCLASS_GPIO,
+ .of_match = nx_gpio_ids,
+ .ops = &nx_gpio_ops,
+ .ofdata_to_platdata = nx_gpio_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct nx_gpio_platdata),
+ .probe = nx_gpio_probe,
+};
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 03d2fed..2cd0ed3 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -317,6 +317,15 @@ config SYS_MXC_I2C8_SLAVE
MXC I2C8 Slave
endif
+config SYS_I2C_NEXELL
+ bool "Nexell I2C driver"
+ depends on DM_I2C
+ help
+ Add support for the Nexell I2C driver. This is used with various
+ Nexell parts such as S5Pxx18 series SoCs. All chips
+ have several I2C ports and all are provided, controlled by the
+ device tree.
+
config SYS_I2C_OMAP24XX
bool "TI OMAP2+ I2C driver"
depends on ARCH_OMAP2PLUS || ARCH_K3
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index f5a471f..64b8ead 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_SYS_I2C_LPC32XX) += lpc32xx_i2c.o
obj-$(CONFIG_SYS_I2C_MESON) += meson_i2c.o
obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o
obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
+obj-$(CONFIG_SYS_I2C_NEXELL) += nx_i2c.o
obj-$(CONFIG_SYS_I2C_OMAP24XX) += omap24xx_i2c.o
obj-$(CONFIG_SYS_I2C_RCAR_I2C) += rcar_i2c.o
obj-$(CONFIG_SYS_I2C_RCAR_IIC) += rcar_iic.o
diff --git a/drivers/i2c/nx_i2c.c b/drivers/i2c/nx_i2c.c
new file mode 100644
index 0000000..a3eec6c
--- /dev/null
+++ b/drivers/i2c/nx_i2c.c
@@ -0,0 +1,537 @@
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/reset.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/nx_gpio.h>
+
+#define I2C_WRITE 0
+#define I2C_READ 1
+
+#define I2C_OK 0
+#define I2C_NOK 1
+#define I2C_NACK 2
+#define I2C_NOK_LA 3 /* Lost arbitration */
+#define I2C_NOK_TOUT 4 /* time out */
+
+#define I2CLC_FILTER 0x04 /* SDA filter on*/
+#define I2CSTAT_BSY 0x20 /* Busy bit */
+#define I2CSTAT_NACK 0x01 /* Nack bit */
+#define I2CSTAT_ABT 0x08 /* Arbitration bit */
+#define I2CCON_ACKGEN 0x80 /* Acknowledge generation */
+#define I2CCON_IRENB 0x20 /* Interrupt Enable bit */
+#define I2CCON_IRPND 0x10 /* Interrupt pending bit */
+#define I2C_MODE_MT 0xC0 /* Master Transmit Mode */
+#define I2C_MODE_MR 0x80 /* Master Receive Mode */
+#define I2C_START_STOP 0x20 /* START / STOP */
+#define I2C_TXRX_ENA 0x10 /* I2C Tx/Rx enable */
+
+#define I2C_TIMEOUT_MS 10 /* 10 ms */
+
+#define I2C_M_NOSTOP 0x100
+
+#ifndef CONFIG_MAX_I2C_NUM
+#define CONFIG_MAX_I2C_NUM 3
+#endif
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct nx_i2c_regs {
+ uint iiccon;
+ uint iicstat;
+ uint iicadd;
+ uint iicds;
+ uint iiclc;
+};
+
+struct nx_i2c_bus {
+ uint bus_num;
+ struct nx_i2c_regs *regs;
+ uint speed;
+ uint target_speed;
+ uint sda_delay;
+};
+
+/* s5pxx18 i2c must be reset before enabled */
+static void i2c_reset(int ch)
+{
+ int rst_id = RESET_ID_I2C0 + ch;
+
+ nx_rstcon_setrst(rst_id, 0);
+ nx_rstcon_setrst(rst_id, 1);
+}
+
+/* FIXME : this func will be removed after reset dm driver ported.
+ * set mmc pad alternative func.
+ */
+static void set_i2c_pad_func(struct nx_i2c_bus *i2c)
+{
+ switch (i2c->bus_num) {
+ case 0:
+ nx_gpio_set_pad_function(3, 2, 1);
+ nx_gpio_set_pad_function(3, 3, 1);
+ break;
+ case 1:
+ nx_gpio_set_pad_function(3, 4, 1);
+ nx_gpio_set_pad_function(3, 5, 1);
+ break;
+ case 2:
+ nx_gpio_set_pad_function(3, 6, 1);
+ nx_gpio_set_pad_function(3, 7, 1);
+ break;
+ }
+}
+
+static uint i2c_get_clkrate(struct nx_i2c_bus *bus)
+{
+ struct clk *clk;
+ int index = bus->bus_num;
+ char name[50] = {0, };
+
+ sprintf(name, "%s.%d", DEV_NAME_I2C, index);
+ clk = clk_get((const char *)name);
+ if (!clk)
+ return -1;
+
+ return clk_get_rate(clk);
+}
+
+static uint i2c_set_clk(struct nx_i2c_bus *bus, uint enb)
+{
+ struct clk *clk;
+ char name[50];
+
+ sprintf(name, "%s.%d", DEV_NAME_I2C, bus->bus_num);
+ clk = clk_get((const char *)name);
+ if (!clk)
+ return -1;
+
+ if (enb) {
+ clk_disable(clk);
+ clk_enable(clk);
+ } else {
+ clk_disable(clk);
+ }
+
+ return 0;
+}
+
+/* get i2c module number from base address */
+static uint i2c_get_busnum(struct nx_i2c_bus *bus)
+{
+ void *base_addr = (void *)PHY_BASEADDR_I2C0;
+ int i;
+
+ for (i = 0; i < CONFIG_MAX_I2C_NUM; i++) {
+ if (base_addr == ((void *)bus->regs)) {
+ bus->bus_num = i;
+ return i;
+ }
+ base_addr += 0x1000;
+ }
+
+ return -1;
+}
+
+/* Set SDA line delay */
+static int nx_i2c_set_sda_delay(struct nx_i2c_bus *bus, ulong clkin)
+{
+ struct nx_i2c_regs *i2c = bus->regs;
+ uint sda_delay = 0;
+
+ if (bus->sda_delay) {
+ sda_delay = clkin * bus->sda_delay;
+ sda_delay = DIV_ROUND_UP(sda_delay, 1000000);
+ sda_delay = DIV_ROUND_UP(sda_delay, 5);
+ if (sda_delay > 3)
+ sda_delay = 3;
+ sda_delay |= I2CLC_FILTER;
+ } else {
+ sda_delay = 0;
+ }
+
+ sda_delay &= 0x7;
+ writel(sda_delay, &i2c->iiclc);
+
+ return 0;
+}
+
+/* Calculate the value of the divider and prescaler, set the bus speed. */
+static int nx_i2c_set_bus_speed(struct udevice *dev, uint speed)
+{
+ struct nx_i2c_bus *bus = dev_get_priv(dev);
+ struct nx_i2c_regs *i2c = bus->regs;
+ unsigned long freq, pres = 16, div;
+
+ freq = i2c_get_clkrate(bus);
+ /* calculate prescaler and divisor values */
+ if ((freq / pres / (16 + 1)) > speed)
+ /* set prescaler to 512 */
+ pres = 512;
+
+ div = 0;
+ while ((freq / pres / (div + 1)) > speed)
+ div++;
+
+ /* set prescaler, divisor according to freq, also set ACKGEN, IRQ */
+ writel((div & 0x0F) | ((pres == 512) ? 0x40 : 0), &i2c->iiccon);
+
+ /* init to SLAVE REVEIVE and set slaveaddr */
+ writel(0, &i2c->iicstat);
+ writel(0x00, &i2c->iicadd);
+ /* program Master Transmit (and implicit STOP) */
+ writel(I2C_MODE_MT | I2C_TXRX_ENA, &i2c->iicstat);
+
+ bus->speed = bus->target_speed / (div * pres);
+
+ return 0;
+}
+
+static void nx_i2c_set_clockrate(struct udevice *dev, uint speed)
+{
+ struct nx_i2c_bus *bus = dev_get_priv(dev);
+ ulong clkin;
+
+ nx_i2c_set_bus_speed(dev, speed);
+ clkin = bus->speed; /* the actual i2c speed */
+ clkin /= 1000; /* clkin now in Khz */
+ nx_i2c_set_sda_delay(bus, clkin);
+}
+
+static void i2c_process_node(struct udevice *dev)
+{
+ struct nx_i2c_bus *bus = dev_get_priv(dev);
+ const void *blob = gd->fdt_blob;
+
+ int node;
+
+ node = dev->node.of_offset;
+
+ bus->target_speed = fdtdec_get_int(blob, node,
+ "nexell,i2c-max-bus-freq", 0);
+ bus->sda_delay = fdtdec_get_int(blob, node,
+ "nexell,i2c-sda-delay", 0);
+}
+
+static int nx_i2c_probe(struct udevice *dev)
+{
+ struct nx_i2c_bus *bus = dev_get_priv(dev);
+
+ /* get regs */
+ bus->regs = (struct nx_i2c_regs *)devfdt_get_addr(dev);
+ /* calc index */
+ if (!i2c_get_busnum(bus)) {
+ debug("not found i2c number!\n");
+ return -1;
+ }
+
+ /* i2c optional node parsing */
+ i2c_process_node(dev);
+ if (!bus->target_speed)
+ return -1;
+
+ /* reset */
+ i2c_reset(bus->bus_num);
+ /* gpio pad */
+ set_i2c_pad_func(bus);
+
+ /* clock rate */
+ i2c_set_clk(bus, 1);
+ nx_i2c_set_clockrate(dev, bus->target_speed);
+ i2c_set_clk(bus, 0);
+
+ return 0;
+}
+
+/* i2c bus busy check */
+static int i2c_is_busy(struct nx_i2c_regs *i2c)
+{
+ ulong start_time;
+
+ start_time = get_timer(0);
+ while (readl(&i2c->iicstat) & I2CSTAT_BSY) {
+ if (get_timer(start_time) > I2C_TIMEOUT_MS) {
+ debug("Timeout\n");
+ return -I2C_NOK_TOUT;
+ }
+ }
+ return 0;
+}
+
+/* irq enable/disable functions */
+static void i2c_enable_irq(struct nx_i2c_regs *i2c)
+{
+ unsigned int reg;
+
+ reg = readl(&i2c->iiccon);
+ reg |= I2CCON_IRENB;
+ writel(reg, &i2c->iiccon);
+}
+
+/* irq clear function */
+static void i2c_clear_irq(struct nx_i2c_regs *i2c)
+{
+ clrbits_le32(&i2c->iiccon, I2CCON_IRPND);
+}
+
+/* ack enable functions */
+static void i2c_enable_ack(struct nx_i2c_regs *i2c)
+{
+ unsigned int reg;
+
+ reg = readl(&i2c->iiccon);
+ reg |= I2CCON_ACKGEN;
+ writel(reg, &i2c->iiccon);
+}
+
+static void i2c_send_stop(struct nx_i2c_regs *i2c)
+{
+ unsigned int reg;
+
+ /* Send STOP. */
+ reg = readl(&i2c->iicstat);
+ reg |= I2C_MODE_MR | I2C_TXRX_ENA;
+ reg &= (~I2C_START_STOP);
+ writel(reg, &i2c->iicstat);
+ i2c_clear_irq(i2c);
+}
+
+static int wait_for_xfer(struct nx_i2c_regs *i2c)
+{
+ unsigned long start_time = get_timer(0);
+
+ do {
+ if (readl(&i2c->iiccon) & I2CCON_IRPND)
+ return (readl(&i2c->iicstat) & I2CSTAT_NACK) ?
+ I2C_NACK : I2C_OK;
+ } while (get_timer(start_time) < I2C_TIMEOUT_MS);
+
+ return I2C_NOK_TOUT;
+}
+
+static int i2c_transfer(struct nx_i2c_regs *i2c,
+ uchar cmd_type,
+ uchar chip,
+ uchar addr[],
+ uchar addr_len,
+ uchar data[],
+ unsigned short data_len,
+ uint seq)
+{
+ uint status;
+ int i = 0, result;
+
+ if (data == 0 || data_len == 0) {
+ /*Don't support data transfer of no length or to address 0 */
+ debug("%s: bad call\n", __func__);
+ return I2C_NOK;
+ }
+
+ i2c_enable_irq(i2c);
+ i2c_enable_ack(i2c);
+
+ /* Get the slave chip address going */
+ writel(chip, &i2c->iicds);
+ status = I2C_TXRX_ENA | I2C_START_STOP;
+ if (cmd_type == I2C_WRITE || (addr && addr_len))
+ status |= I2C_MODE_MT;
+ else
+ status |= I2C_MODE_MR;
+ writel(status, &i2c->iicstat);
+ if (seq)
+ i2c_clear_irq(i2c);
+
+ /* Wait for chip address to transmit. */
+ result = wait_for_xfer(i2c);
+ if (result != I2C_OK)
+ goto bailout;
+
+ /* If register address needs to be transmitted - do it now. */
+ if (addr && addr_len) { /* register addr */
+ while ((i < addr_len) && (result == I2C_OK)) {
+ writel(addr[i++], &i2c->iicds);
+ i2c_clear_irq(i2c);
+ result = wait_for_xfer(i2c);
+ }
+
+ i = 0;
+ if (result != I2C_OK)
+ goto bailout;
+ }
+
+ switch (cmd_type) {
+ case I2C_WRITE:
+ while ((i < data_len) && (result == I2C_OK)) {
+ writel(data[i++], &i2c->iicds);
+ i2c_clear_irq(i2c);
+ result = wait_for_xfer(i2c);
+ }
+ break;
+ case I2C_READ:
+ if (addr && addr_len) {
+ /*
+ * Register address has been sent, now send slave chip
+ * address again to start the actual read transaction.
+ */
+ writel(chip, &i2c->iicds);
+
+ /* Generate a re-START. */
+ writel(I2C_MODE_MR | I2C_TXRX_ENA
+ | I2C_START_STOP, &i2c->iicstat);
+ i2c_clear_irq(i2c);
+ result = wait_for_xfer(i2c);
+ if (result != I2C_OK)
+ goto bailout;
+ }
+
+ while ((i < data_len) && (result == I2C_OK)) {
+ /* disable ACK for final READ */
+ if (i == data_len - 1)
+ clrbits_le32(&i2c->iiccon
+ , I2CCON_ACKGEN);
+
+ i2c_clear_irq(i2c);
+ result = wait_for_xfer(i2c);
+ data[i++] = readb(&i2c->iicds);
+ }
+
+ if (result == I2C_NACK)
+ result = I2C_OK; /* Normal terminated read. */
+ break;
+
+ default:
+ debug("%s: bad call\n", __func__);
+ result = I2C_NOK;
+ break;
+ }
+
+bailout:
+ return result;
+}
+
+static int nx_i2c_read(struct udevice *dev, uchar chip, uint addr,
+ uint alen, uchar *buffer, uint len, uint seq)
+{
+ struct nx_i2c_bus *i2c;
+ uchar xaddr[4];
+ int ret;
+
+ i2c = dev_get_priv(dev);
+ if (!i2c)
+ return -EFAULT;
+
+ if (alen > 4) {
+ debug("I2C read: addr len %d not supported\n", alen);
+ return -EADDRNOTAVAIL;
+ }
+
+ if (alen > 0)
+ xaddr[0] = (addr >> 24) & 0xFF;
+
+ if (alen > 0) {
+ xaddr[0] = (addr >> 24) & 0xFF;
+ xaddr[1] = (addr >> 16) & 0xFF;
+ xaddr[2] = (addr >> 8) & 0xFF;
+ xaddr[3] = addr & 0xFF;
+ }
+
+ ret = i2c_transfer(i2c->regs, I2C_READ, chip << 1,
+ &xaddr[4 - alen], alen, buffer, len, seq);
+
+ if (ret) {
+ debug("I2C read failed %d\n", ret);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int nx_i2c_write(struct udevice *dev, uchar chip, uint addr,
+ uint alen, uchar *buffer, uint len, uint seq)
+{
+ struct nx_i2c_bus *i2c;
+ uchar xaddr[4];
+ int ret;
+
+ i2c = dev_get_priv(dev);
+ if (!i2c)
+ return -EFAULT;
+
+ if (alen > 4) {
+ debug("I2C write: addr len %d not supported\n", alen);
+ return -EINVAL;
+ }
+
+ if (alen > 0) {
+ xaddr[0] = (addr >> 24) & 0xFF;
+ xaddr[1] = (addr >> 16) & 0xFF;
+ xaddr[2] = (addr >> 8) & 0xFF;
+ xaddr[3] = addr & 0xFF;
+ }
+
+ ret = i2c_transfer(i2c->regs, I2C_WRITE, chip << 1,
+ &xaddr[4 - alen], alen, buffer, len, seq);
+ if (ret) {
+ debug("I2C write failed %d\n", ret);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int nx_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs)
+{
+ struct nx_i2c_bus *bus = dev_get_priv(dev);
+ struct nx_i2c_regs *i2c = bus->regs;
+ int ret;
+ int i;
+
+ /* The power loss by the clock, only during on/off. */
+ i2c_set_clk(bus, 1);
+
+ /* Bus State(Busy) check */
+ ret = i2c_is_busy(i2c);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < nmsgs; msg++, i++) {
+ if (msg->flags & I2C_M_RD) {
+ ret = nx_i2c_read(dev, msg->addr, 0, 0, msg->buf,
+ msg->len, i);
+ } else {
+ ret = nx_i2c_write(dev, msg->addr, 0, 0, msg->buf,
+ msg->len, i);
+ }
+
+ if (ret) {
+ debug("i2c_xfer: error sending\n");
+ return -EREMOTEIO;
+ }
+ }
+ /* Send Stop */
+ i2c_send_stop(i2c);
+ i2c_set_clk(bus, 0);
+
+ return ret ? -EREMOTEIO : 0;
+};
+
+static const struct dm_i2c_ops nx_i2c_ops = {
+ .xfer = nx_i2c_xfer,
+ .set_bus_speed = nx_i2c_set_bus_speed,
+};
+
+static const struct udevice_id nx_i2c_ids[] = {
+ { .compatible = "nexell,s5pxx18-i2c" },
+ { }
+};
+
+U_BOOT_DRIVER(i2c_nexell) = {
+ .name = "i2c_nexell",
+ .id = UCLASS_I2C,
+ .of_match = nx_i2c_ids,
+ .probe = nx_i2c_probe,
+ .priv_auto_alloc_size = sizeof(struct nx_i2c_bus),
+ .ops = &nx_i2c_ops,
+};
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 2f0eedc..bb8e7c0 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -253,6 +253,12 @@ config MMC_DW_SNPS
This selects support for Synopsys DesignWare Memory Card Interface driver
extensions used in various Synopsys ARC devboards.
+config NEXELL_DWMMC
+ bool "Nexell SD/MMC controller support"
+ depends on ARCH_NEXELL
+ depends on MMC_DW
+ default y
+
config MMC_MESON_GX
bool "Meson GX EMMC controller support"
depends on DM_MMC && BLK && ARCH_MESON
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 9c1f8e5..a7b5a7b 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
obj-$(CONFIG_SH_SDHI) += sh_sdhi.o
obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o
obj-$(CONFIG_JZ47XX_MMC) += jz_mmc.o
+obj-$(CONFIG_NEXELL_DWMMC) += nexell_dw_mmc_dm.o
# SDHCI
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
diff --git a/drivers/mmc/nexell_dw_mmc_dm.c b/drivers/mmc/nexell_dw_mmc_dm.c
new file mode 100644
index 0000000..b06b60d
--- /dev/null
+++ b/drivers/mmc/nexell_dw_mmc_dm.c
@@ -0,0 +1,350 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park at nexell.co.kr>
+ *
+ * (C) Copyright 2019 Stefan Bosch <stefan_b at posteo.net>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <dwmmc.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/arch/nx_gpio.h>
+#include <asm/arch/reset.h>
+
+#define DWMCI_CLKSEL 0x09C
+#define DWMCI_SHIFT_0 0x0
+#define DWMCI_SHIFT_1 0x1
+#define DWMCI_SHIFT_2 0x2
+#define DWMCI_SHIFT_3 0x3
+#define DWMCI_SET_SAMPLE_CLK(x) (x)
+#define DWMCI_SET_DRV_CLK(x) ((x) << 16)
+#define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
+#define DWMCI_CLKCTRL 0x114
+#define NX_MMC_CLK_DELAY(x, y, a, b) ((((x) & 0xFF) << 0) |\
+ (((y) & 0x03) << 16) |\
+ (((a) & 0xFF) << 8) |\
+ (((b) & 0x03) << 24))
+
+struct nexell_mmc_plat {
+ struct mmc_config cfg;
+ struct mmc mmc;
+};
+
+struct nexell_dwmmc_priv {
+ struct clk *clk;
+ struct dwmci_host host;
+ int fifo_size;
+ bool fifo_mode;
+ int frequency;
+ u32 min_freq;
+ u32 max_freq;
+ int d_delay;
+ int d_shift;
+ int s_delay;
+ int s_shift;
+
+};
+
+struct clk *clk_get(const char *id);
+
+static void set_pin_stat(int index, int bit, int value)
+{
+#if !defined(CONFIG_SPL_BUILD)
+ nx_gpio_set_pad_function(index, bit, value);
+#else
+#if defined(CONFIG_ARCH_S5P4418) || \
+ defined(CONFIG_ARCH_S5P6818)
+
+ unsigned long base[5] = {
+ PHY_BASEADDR_GPIOA, PHY_BASEADDR_GPIOB,
+ PHY_BASEADDR_GPIOC, PHY_BASEADDR_GPIOD,
+ PHY_BASEADDR_GPIOE,
+ };
+
+ dw_mmc_set_pin(base[index], bit, value);
+#endif
+#endif
+}
+
+static void nx_dw_mmc_set_pin(struct dwmci_host *host)
+{
+ debug(" %s(): dev_index == %d", __func__, host->dev_index);
+
+ switch (host->dev_index) {
+ case 0:
+ set_pin_stat(0, 29, 1);
+ set_pin_stat(0, 31, 1);
+ set_pin_stat(1, 1, 1);
+ set_pin_stat(1, 3, 1);
+ set_pin_stat(1, 5, 1);
+ set_pin_stat(1, 7, 1);
+ break;
+ case 1:
+ set_pin_stat(3, 22, 1);
+ set_pin_stat(3, 23, 1);
+ set_pin_stat(3, 24, 1);
+ set_pin_stat(3, 25, 1);
+ set_pin_stat(3, 26, 1);
+ set_pin_stat(3, 27, 1);
+ break;
+ case 2:
+ set_pin_stat(2, 18, 2);
+ set_pin_stat(2, 19, 2);
+ set_pin_stat(2, 20, 2);
+ set_pin_stat(2, 21, 2);
+ set_pin_stat(2, 22, 2);
+ set_pin_stat(2, 23, 2);
+ if (host->buswidth == 8) {
+ set_pin_stat(4, 21, 2);
+ set_pin_stat(4, 22, 2);
+ set_pin_stat(4, 23, 2);
+ set_pin_stat(4, 24, 2);
+ }
+ break;
+ default:
+ debug(" is invalid!");
+ }
+ debug("\n");
+}
+
+static void nx_dw_mmc_clksel(struct dwmci_host *host)
+{
+ u32 val;
+
+#ifdef CONFIG_BOOST_MMC
+ val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
+ DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(1);
+#else
+ val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
+ DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3);
+#endif
+
+ dwmci_writel(host, DWMCI_CLKSEL, val);
+}
+
+static void nx_dw_mmc_reset(int ch)
+{
+ int rst_id = RESET_ID_SDMMC0 + ch;
+
+ nx_rstcon_setrst(rst_id, 0);
+ nx_rstcon_setrst(rst_id, 1);
+}
+
+static void nx_dw_mmc_clk_delay(struct udevice *dev)
+{
+ unsigned int delay;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+
+ delay = NX_MMC_CLK_DELAY(priv->d_delay,
+ priv->d_shift, priv->s_delay, priv->s_shift);
+
+ writel(delay, (host->ioaddr + DWMCI_CLKCTRL));
+ debug("%s(): Values set: d_delay==%d, d_shift==%d, s_delay==%d, "
+ "s_shift==%d\n", __func__, priv->d_delay, priv->d_shift,
+ priv->s_delay, priv->s_shift);
+}
+
+static unsigned int nx_dw_mmc_get_clk(struct dwmci_host *host, uint freq)
+{
+ struct clk *clk;
+ struct udevice *dev = host->priv;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+
+ int index = host->dev_index;
+ char name[50] = { 0, };
+
+ clk = priv->clk;
+ if (!clk) {
+ sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
+ clk = clk_get((const char *)name);
+ if (!clk)
+ return 0;
+ priv->clk = clk;
+ }
+
+ return clk_get_rate(clk) / 2;
+}
+
+static unsigned long nx_dw_mmc_set_clk(struct dwmci_host *host,
+ unsigned int rate)
+{
+ struct clk *clk;
+ char name[50] = { 0, };
+ struct udevice *dev = host->priv;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+
+ int index = host->dev_index;
+
+ clk = priv->clk;
+ if (!clk) {
+ sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
+ clk = clk_get((const char *)name);
+ if (!clk)
+ return 0;
+ priv->clk = clk;
+ }
+
+ clk_disable(clk);
+ rate = clk_set_rate(clk, rate);
+ clk_enable(clk);
+
+ return rate;
+}
+
+static int nexell_dwmmc_ofdata_to_platdata(struct udevice *dev)
+{
+ /* if (dev): *priv = dev->priv, else: *priv = NULL */
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+ int val = -1;
+
+ debug("%s()\n", __func__);
+
+ host->name = dev->name;
+ host->ioaddr = dev_read_addr_ptr(dev);
+
+ val = dev_read_u32_default(dev, "nexell,bus-width", -1);
+ if (val < 0) {
+ debug(" 'nexell,bus-width' missing/invalid!\n");
+ return -EINVAL;
+ }
+ host->buswidth = val;
+ host->get_mmc_clk = nx_dw_mmc_get_clk;
+ host->clksel = nx_dw_mmc_clksel;
+ host->priv = dev;
+
+ val = dev_read_u32_default(dev, "index", -1);
+ if (val < 0) {
+ debug(" 'index' missing/invalid!\n");
+ return -EINVAL;
+ }
+ host->dev_index = val;
+
+ val = dev_read_u32_default(dev, "fifo-size", 0x20);
+ if (val <= 0) {
+ debug(" 'fifo-size' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->fifo_size = val;
+
+ priv->fifo_mode = dev_read_bool(dev, "fifo-mode");
+
+ val = dev_read_u32_default(dev, "frequency", -1);
+ if (val < 0) {
+ debug(" 'frequency' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->frequency = val;
+
+ val = dev_read_u32_default(dev, "max-frequency", -1);
+ if (val < 0) {
+ debug(" 'max-frequency' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->max_freq = val;
+ priv->min_freq = 400000; /* 400 kHz */
+
+ val = dev_read_u32_default(dev, "nexell,drive_dly", -1);
+ if (val < 0) {
+ debug(" 'nexell,drive_dly' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->d_delay = val;
+
+ val = dev_read_u32_default(dev, "nexell,drive_shift", -1);
+ if (val < 0) {
+ debug(" 'nexell,drive_shift' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->d_shift = val;
+
+ val = dev_read_u32_default(dev, "nexell,sample_dly", -1);
+ if (val < 0) {
+ debug(" 'nexell,sample_dly' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->s_delay = val;
+
+ val = dev_read_u32_default(dev, "nexell,sample_shift", -1);
+ if (val < 0) {
+ debug(" 'nexell,sample_shift' missing/invalid!\n");
+ return -EINVAL;
+ }
+ priv->s_shift = val;
+
+ debug(" index==%d, name==%s, ioaddr==0x%08x, buswidth==%d, "
+ "fifo_size==%d, fifo_mode==%d, frequency==%d\n",
+ host->dev_index, host->name, (u32)host->ioaddr,
+ host->buswidth, priv->fifo_size, priv->fifo_mode,
+ priv->frequency);
+ debug(" min_freq==%d, max_freq==%d, delay: "
+ "0x%02x:0x%02x:0x%02x:0x%02x\n",
+ priv->min_freq, priv->max_freq, priv->d_delay,
+ priv->d_shift, priv->s_delay, priv->s_shift);
+
+ return 0;
+}
+
+static int nexell_dwmmc_probe(struct udevice *dev)
+{
+ struct nexell_mmc_plat *plat = dev_get_platdata(dev);
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+ struct udevice *pwr_dev __maybe_unused;
+
+ debug("%s():\n", __func__);
+
+ host->fifoth_val = MSIZE(0x2) |
+ RX_WMARK(priv->fifo_size / 2 - 1) |
+ TX_WMARK(priv->fifo_size / 2);
+
+ host->fifo_mode = priv->fifo_mode;
+
+ dwmci_setup_cfg(&plat->cfg, host, priv->max_freq, priv->min_freq);
+ host->mmc = &plat->mmc;
+ host->mmc->priv = &priv->host;
+ host->mmc->dev = dev;
+ upriv->mmc = host->mmc;
+
+ nx_dw_mmc_set_pin(host);
+
+ debug(" nx_dw_mmc_set_clk(host, frequency * 4 == %d)\n",
+ priv->frequency * 4);
+ nx_dw_mmc_set_clk(host, priv->frequency * 4);
+
+ nx_dw_mmc_reset(host->dev_index);
+ nx_dw_mmc_clk_delay(dev);
+
+ return dwmci_probe(dev);
+}
+
+static int nexell_dwmmc_bind(struct udevice *dev)
+{
+ struct nexell_mmc_plat *plat = dev_get_platdata(dev);
+
+ return dwmci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id nexell_dwmmc_ids[] = {
+ { .compatible = "nexell,nexell-dwmmc" },
+ { }
+};
+
+U_BOOT_DRIVER(nexell_dwmmc_drv) = {
+ .name = "nexell_dwmmc",
+ .id = UCLASS_MMC,
+ .of_match = nexell_dwmmc_ids,
+ .ofdata_to_platdata = nexell_dwmmc_ofdata_to_platdata,
+ .ops = &dm_dwmci_ops,
+ .bind = nexell_dwmmc_bind,
+ .probe = nexell_dwmmc_probe,
+ .priv_auto_alloc_size = sizeof(struct nexell_dwmmc_priv),
+ .platdata_auto_alloc_size = sizeof(struct nexell_mmc_plat),
+};
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index a837c35..b45aada 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_PWM_ROCKCHIP) += rk_pwm.o
obj-$(CONFIG_PWM_SANDBOX) += sandbox_pwm.o
obj-$(CONFIG_PWM_TEGRA) += tegra_pwm.o
obj-$(CONFIG_PWM_SUNXI) += sunxi_pwm.o
+obj-$(CONFIG_PWM_NX) += pwm-nexell.o
diff --git a/drivers/pwm/pwm-nexell.c b/drivers/pwm/pwm-nexell.c
new file mode 100644
index 0000000..6c0f8f4
--- /dev/null
+++ b/drivers/pwm/pwm-nexell.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ *
+ * Donghwa Lee <dh09.lee at samsung.com>
+ */
+
+/* This codes are copied from arch/arm/cpu/armv7/s5p-common/pwm.c */
+
+#include <common.h>
+#include <errno.h>
+#include <pwm.h>
+#include <asm/io.h>
+#include <asm/arch/clk.h>
+#include "pwm-nexell.h"
+
+#if defined(CONFIG_ARCH_NEXELL)
+#include <asm/arch/nexell.h>
+#include <asm/arch/reset.h>
+#include <asm/arch/nx_gpio.h>
+#include <asm/arch/tieoff.h>
+
+struct pwm_device {
+ int ch;
+ int grp;
+ int bit;
+ int pwm_fn;
+};
+
+static struct pwm_device pwm_dev[] = {
+ [0] = { .ch = 0, .grp = 3, .bit = 1, .pwm_fn = 1 },
+ [1] = { .ch = 1, .grp = 2, .bit = 13, .pwm_fn = 2 },
+ [2] = { .ch = 2, .grp = 2, .bit = 14, .pwm_fn = 2 },
+ [3] = { .ch = 3, .grp = 3, .bit = 0, .pwm_fn = 2 },
+};
+#endif
+
+int pwm_enable(int pwm_id)
+{
+ const struct s5p_timer *pwm =
+#if defined(CONFIG_ARCH_NEXELL)
+ (struct s5p_timer *)PHY_BASEADDR_PWM;
+#else
+ (struct s5p_timer *)samsung_get_base_timer();
+#endif
+ unsigned long tcon;
+
+ tcon = readl(&pwm->tcon);
+ tcon |= TCON_START(pwm_id);
+
+ writel(tcon, &pwm->tcon);
+
+ return 0;
+}
+
+void pwm_disable(int pwm_id)
+{
+ const struct s5p_timer *pwm =
+#if defined(CONFIG_ARCH_NEXELL)
+ (struct s5p_timer *)PHY_BASEADDR_PWM;
+#else
+ (struct s5p_timer *)samsung_get_base_timer();
+#endif
+ unsigned long tcon;
+
+ tcon = readl(&pwm->tcon);
+ tcon &= ~TCON_START(pwm_id);
+
+ writel(tcon, &pwm->tcon);
+}
+
+static unsigned long pwm_calc_tin(int pwm_id, unsigned long freq)
+{
+ unsigned long tin_parent_rate;
+ unsigned int div;
+#if defined(CONFIG_ARCH_NEXELL)
+ unsigned int pre_div;
+ const struct s5p_timer *pwm =
+ (struct s5p_timer *)PHY_BASEADDR_PWM;
+ unsigned int val;
+#endif
+
+#if defined(CONFIG_ARCH_NEXELL)
+ struct clk *clk = clk_get(CORECLK_NAME_PCLK);
+
+ tin_parent_rate = clk_get_rate(clk);
+#else
+ tin_parent_rate = get_pwm_clk();
+#endif
+
+#if defined(CONFIG_ARCH_NEXELL)
+ writel(0, &pwm->tcfg0);
+ val = readl(&pwm->tcfg0);
+
+ if (pwm_id < 2)
+ div = ((val >> 0) & 0xff) + 1;
+ else
+ div = ((val >> 8) & 0xff) + 1;
+
+ writel(0, &pwm->tcfg1);
+ val = readl(&pwm->tcfg1);
+ val = (val >> MUX_DIV_SHIFT(pwm_id)) & 0xF;
+ pre_div = (1UL << val);
+
+ freq = tin_parent_rate / div / pre_div;
+
+ return freq;
+#else
+ for (div = 2; div <= 16; div *= 2) {
+ if ((tin_parent_rate / (div << 16)) < freq)
+ return tin_parent_rate / div;
+ }
+
+ return tin_parent_rate / 16;
+#endif
+}
+
+#define NS_IN_SEC 1000000000UL
+
+int pwm_config(int pwm_id, int duty_ns, int period_ns)
+{
+ const struct s5p_timer *pwm =
+#if defined(CONFIG_ARCH_NEXELL)
+ (struct s5p_timer *)PHY_BASEADDR_PWM;
+#else
+ (struct s5p_timer *)samsung_get_base_timer();
+#endif
+ unsigned int offset;
+ unsigned long tin_rate;
+ unsigned long tin_ns;
+ unsigned long frequency;
+ unsigned long tcon;
+ unsigned long tcnt;
+ unsigned long tcmp;
+
+ /*
+ * We currently avoid using 64bit arithmetic by using the
+ * fact that anything faster than 1GHz is easily representable
+ * by 32bits.
+ */
+ if (period_ns > NS_IN_SEC || duty_ns > NS_IN_SEC || period_ns == 0)
+ return -ERANGE;
+
+ if (duty_ns > period_ns)
+ return -EINVAL;
+
+ frequency = NS_IN_SEC / period_ns;
+
+ /* Check to see if we are changing the clock rate of the PWM */
+ tin_rate = pwm_calc_tin(pwm_id, frequency);
+
+ tin_ns = NS_IN_SEC / tin_rate;
+#if defined(CONFIG_ARCH_NEXELL)
+ /* The counter starts at zero. */
+ tcnt = (period_ns / tin_ns) - 1;
+#else
+ tcnt = period_ns / tin_ns;
+#endif
+
+ /* Note, counters count down */
+ tcmp = duty_ns / tin_ns;
+ tcmp = tcnt - tcmp;
+
+ /* Update the PWM register block. */
+ offset = pwm_id * 3;
+ if (pwm_id < 4) {
+ writel(tcnt, &pwm->tcntb0 + offset);
+ writel(tcmp, &pwm->tcmpb0 + offset);
+ }
+
+ tcon = readl(&pwm->tcon);
+ tcon |= TCON_UPDATE(pwm_id);
+ if (pwm_id < 4)
+ tcon |= TCON_AUTO_RELOAD(pwm_id);
+ else
+ tcon |= TCON4_AUTO_RELOAD;
+ writel(tcon, &pwm->tcon);
+
+ tcon &= ~TCON_UPDATE(pwm_id);
+ writel(tcon, &pwm->tcon);
+
+ return 0;
+}
+
+int pwm_init(int pwm_id, int div, int invert)
+{
+ u32 val;
+ const struct s5p_timer *pwm =
+#if defined(CONFIG_ARCH_NEXELL)
+ (struct s5p_timer *)PHY_BASEADDR_PWM;
+#else
+ (struct s5p_timer *)samsung_get_base_timer();
+#endif
+ unsigned long ticks_per_period;
+ unsigned int offset, prescaler;
+
+ /*
+ * Timer Freq(HZ) =
+ * PWM_CLK / { (prescaler_value + 1) * (divider_value) }
+ */
+
+ val = readl(&pwm->tcfg0);
+ if (pwm_id < 2) {
+ prescaler = PRESCALER_0;
+ val &= ~0xff;
+ val |= (prescaler & 0xff);
+ } else {
+ prescaler = PRESCALER_1;
+ val &= ~(0xff << 8);
+ val |= (prescaler & 0xff) << 8;
+ }
+ writel(val, &pwm->tcfg0);
+ val = readl(&pwm->tcfg1);
+ val &= ~(0xf << MUX_DIV_SHIFT(pwm_id));
+ val |= (div & 0xf) << MUX_DIV_SHIFT(pwm_id);
+ writel(val, &pwm->tcfg1);
+
+ if (pwm_id == 4) {
+ /*
+ * TODO(sjg): Use this as a countdown timer for now. We count
+ * down from the maximum value to 0, then reset.
+ */
+ ticks_per_period = -1UL;
+ } else {
+ const unsigned long pwm_hz = 1000;
+#if defined(CONFIG_ARCH_NEXELL)
+ struct clk *clk = clk_get(CORECLK_NAME_PCLK);
+ unsigned long timer_rate_hz = clk_get_rate(clk) /
+#else
+ unsigned long timer_rate_hz = get_pwm_clk() /
+#endif
+ ((prescaler + 1) * (1 << div));
+
+ ticks_per_period = timer_rate_hz / pwm_hz;
+ }
+
+ /* set count value */
+ offset = pwm_id * 3;
+
+ writel(ticks_per_period, &pwm->tcntb0 + offset);
+
+ val = readl(&pwm->tcon) & ~(0xf << TCON_OFFSET(pwm_id));
+ if (invert && pwm_id < 4)
+ val |= TCON_INVERTER(pwm_id);
+ writel(val, &pwm->tcon);
+
+ nx_gpio_set_pad_function(pwm_dev[pwm_id].grp, pwm_dev[pwm_id].bit,
+ pwm_dev[pwm_id].pwm_fn);
+ pwm_enable(pwm_id);
+
+ return 0;
+}
diff --git a/drivers/pwm/pwm-nexell.h b/drivers/pwm/pwm-nexell.h
new file mode 100644
index 0000000..92dc707
--- /dev/null
+++ b/drivers/pwm/pwm-nexell.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Kyungmin Park <kyungmin.park at samsung.com>
+ * Minkyu Kang <mk7.kang at samsung.com>
+ */
+
+#ifndef __ASM_ARM_ARCH_PWM_H_
+#define __ASM_ARM_ARCH_PWM_H_
+
+#define PRESCALER_0 (8 - 1) /* prescaler of timer 0, 1 */
+#define PRESCALER_1 (16 - 1) /* prescaler of timer 2, 3, 4 */
+
+/* Divider MUX */
+#define MUX_DIV_1 0 /* 1/1 period */
+#define MUX_DIV_2 1 /* 1/2 period */
+#define MUX_DIV_4 2 /* 1/4 period */
+#define MUX_DIV_8 3 /* 1/8 period */
+#define MUX_DIV_16 4 /* 1/16 period */
+
+#define MUX_DIV_SHIFT(x) ((x) * 4)
+
+#define TCON_OFFSET(x) (((x) + 1) * (!!x) << 2)
+
+#define TCON_START(x) (1 << TCON_OFFSET(x))
+#define TCON_UPDATE(x) (1 << (TCON_OFFSET(x) + 1))
+#define TCON_INVERTER(x) (1 << (TCON_OFFSET(x) + 2))
+#define TCON_AUTO_RELOAD(x) (1 << (TCON_OFFSET(x) + 3))
+#define TCON4_AUTO_RELOAD (1 << 22)
+
+#ifndef __ASSEMBLY__
+struct s5p_timer {
+ unsigned int tcfg0;
+ unsigned int tcfg1;
+ unsigned int tcon;
+ unsigned int tcntb0;
+ unsigned int tcmpb0;
+ unsigned int tcnto0;
+ unsigned int tcntb1;
+ unsigned int tcmpb1;
+ unsigned int tcnto1;
+ unsigned int tcntb2;
+ unsigned int tcmpb2;
+ unsigned int tcnto2;
+ unsigned int tcntb3;
+ unsigned int res1;
+ unsigned int tcnto3;
+ unsigned int tcntb4;
+ unsigned int tcnto4;
+ unsigned int tintcstat;
+};
+#endif /* __ASSEMBLY__ */
+
+#endif
--
1.9.1
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