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b2e6355559
linux/arch/arm/mach-ixp4xx/goramo_mlr.c
Linus Walleij b2e6355559 i2c: gpio: Convert to use descriptors 
This converts the GPIO-based I2C-driver to using GPIO
descriptors instead of the old global numberspace-based
GPIO interface. We:

- Convert the driver to unconditionally grab two GPIOs
  from the device by index 0 (SDA) and 1 (SCL) which
  will work fine with device tree and descriptor tables.
  The existing device trees will continue to work just
  like before, but without any roundtrip through the
  global numberspace.

- Brutally convert all boardfiles still passing global
  GPIOs by registering descriptor tables associated with
  the devices instead so this driver does not need to keep
  supporting passing any GPIO numbers as platform data.

There is no stepwise approach as elegant as this, I
strongly prefer this big hammer over any antsteps for this
conversion. This way the old GPIO numbers go away and
NEVER COME BACK.

Special conversion for the different boards utilizing
I2C-GPIO:

- EP93xx (arch/arm/mach-ep93xx): pretty straight forward as
  all boards were using the same two GPIO lines, just define
  these two in a lookup table for "i2c-gpio" and register
  these along with the device. None of them define any
  other platform data so just pass NULL as platform data.
  This platform selects GPIOLIB so all should be smooth.
  The pins appear on a gpiochip for bank "G" as pins 1 (SDA)
  and 0 (SCL).

- IXP4 (arch/arm/mach-ixp4): descriptor tables have to
  be registered for each board separately. They all use
  "IXP4XX_GPIO_CHIP" so it is pretty straight forward.
  Most board define no other platform data than SCL/SDA
  so they can drop the #include of <linux/i2c-gpio.h> and
  assign NULL to platform data.

  The "goramo_mlr" (Goramo Multilink Router) board is a bit
  worrisome: it implements its own I2C bit-banging in the
  board file, and optionally registers an I2C serial port,
  but claims the same GPIO lines for itself in the board file.
  This is not going to work: there will be competition for the
  GPIO lines, so delete the optional extra I2C bus instead, no
  I2C devices are registered on it anyway, there are just hints
  that it may contain an EEPROM that may be accessed from
  userspace. This needs to be fixed up properly by the serial
  clock using I2C emulation so drop a note in the code.

- KS8695 board acs5k (arch/arm/mach-ks8695/board-acs5.c)
  has some platform data in addition to the pins so it needs to
  be kept around sans GPIO lines. Its GPIO chip is named
  "KS8695" and the arch selects GPIOLIB.

- PXA boards (arch/arm/mach-pxa/*) use some of the platform
  data so it needs to be preserved here. The viper board even
  registers two GPIO I2Cs. The gpiochip is named "gpio-pxa" and
  the arch selects GPIOLIB.

- SA1100 Simpad (arch/arm/mach-sa1100/simpad.c) defines a GPIO
  I2C bus, and the arch selects GPIOLIB.

- Blackfin boards (arch/blackfin/bf533 etc) for these I assume
  their I2C GPIOs refer to the local gpiochip defined in
  arch/blackfin/kernel/bfin_gpio.c names "BFIN-GPIO".
  The arch selects GPIOLIB. The boards get spiked with
  IF_ENABLED(I2C_GPIO) but that is a side effect of it
  being like that already (I would just have Kconfig select
  I2C_GPIO and get rid of them all.) I also delete any
  platform data set to 0 as it will get that value anyway
  from static declartions of platform data.

- The MIPS selects GPIOLIB and the Alchemy machine is using
  two local GPIO chips, one of them has a GPIO I2C. We need
  to adjust the local offset from the global number space here.
  The ATH79 has a proper GPIO driver in drivers/gpio/gpio-ath79.c
  and AFAICT the chip is named "ath79-gpio" and the PB44
  PCF857x expander spawns from this on GPIO 1 and 0. The latter
  board only use the platform data to specify pins so it can be
  cut altogether after this.

- The MFD Silicon Motion SM501 is a special case. It dynamically
  spawns an I2C bus off the MFD using sm501_create_subdev().
  We use an approach to dynamically create a machine descriptor
  table and attach this to the "SM501-LOW" or "SM501-HIGH"
  gpiochip. We use chip-local offsets to grab the right lines.
  We can get rid of two local static inline helpers as part
  of this refactoring.

Cc: Steven Miao <realmz6@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Heiko Schocher <hs@denx.de>
Acked-by: Wu, Aaron <Aaron.Wu@analog.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-10-30 08:42:21 +01:00

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/*
* Goramo MultiLink router platform code
* Copyright (C) 2006-2009 Krzysztof Halasa <khc@pm.waw.pl>
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/hdlc.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/serial_8250.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/pci.h>
#include <asm/system_info.h>
#define SLOT_ETHA 0x0B /* IDSEL = AD21 */
#define SLOT_ETHB 0x0C /* IDSEL = AD20 */
#define SLOT_MPCI 0x0D /* IDSEL = AD19 */
#define SLOT_NEC 0x0E /* IDSEL = AD18 */
/* GPIO lines */
#define GPIO_SCL 0
#define GPIO_SDA 1
#define GPIO_STR 2
#define GPIO_IRQ_NEC 3
#define GPIO_IRQ_ETHA 4
#define GPIO_IRQ_ETHB 5
#define GPIO_HSS0_DCD_N 6
#define GPIO_HSS1_DCD_N 7
#define GPIO_UART0_DCD 8
#define GPIO_UART1_DCD 9
#define GPIO_HSS0_CTS_N 10
#define GPIO_HSS1_CTS_N 11
#define GPIO_IRQ_MPCI 12
#define GPIO_HSS1_RTS_N 13
#define GPIO_HSS0_RTS_N 14
/* GPIO15 is not connected */
/* Control outputs from 74HC4094 */
#define CONTROL_HSS0_CLK_INT 0
#define CONTROL_HSS1_CLK_INT 1
#define CONTROL_HSS0_DTR_N 2
#define CONTROL_HSS1_DTR_N 3
#define CONTROL_EXT 4
#define CONTROL_AUTO_RESET 5
#define CONTROL_PCI_RESET_N 6
#define CONTROL_EEPROM_WC_N 7
/* offsets from start of flash ROM = 0x50000000 */
#define CFG_ETH0_ADDRESS 0x40 /* 6 bytes */
#define CFG_ETH1_ADDRESS 0x46 /* 6 bytes */
#define CFG_REV 0x4C /* u32 */
#define CFG_SDRAM_SIZE 0x50 /* u32 */
#define CFG_SDRAM_CONF 0x54 /* u32 */
#define CFG_SDRAM_MODE 0x58 /* u32 */
#define CFG_SDRAM_REFRESH 0x5C /* u32 */
#define CFG_HW_BITS 0x60 /* u32 */
#define CFG_HW_USB_PORTS 0x00000007 /* 0 = no NEC chip, 1-5 = ports # */
#define CFG_HW_HAS_PCI_SLOT 0x00000008
#define CFG_HW_HAS_ETH0 0x00000010
#define CFG_HW_HAS_ETH1 0x00000020
#define CFG_HW_HAS_HSS0 0x00000040
#define CFG_HW_HAS_HSS1 0x00000080
#define CFG_HW_HAS_UART0 0x00000100
#define CFG_HW_HAS_UART1 0x00000200
#define CFG_HW_HAS_EEPROM 0x00000400
#define FLASH_CMD_READ_ARRAY 0xFF
#define FLASH_CMD_READ_ID 0x90
#define FLASH_SER_OFF 0x102 /* 0x81 in 16-bit mode */
static u32 hw_bits = 0xFFFFFFFD; /* assume all hardware present */;
static u8 control_value;
/*
* FIXME: this is reimplementing I2C bit-bangining. Move this
* over to using driver/i2c/busses/i2c-gpio.c like all other boards
* and register proper I2C device(s) on the bus for this. (See
* other IXP4xx boards for examples.)
*/
static void set_scl(u8 value)
{
gpio_set_value(GPIO_SCL, !!value);
udelay(3);
}
static void set_sda(u8 value)
{
gpio_set_value(GPIO_SDA, !!value);
udelay(3);
}
static void set_str(u8 value)
{
gpio_set_value(GPIO_STR, !!value);
udelay(3);
}
static inline void set_control(int line, int value)
{
if (value)
control_value |= (1 << line);
else
control_value &= ~(1 << line);
}
static void output_control(void)
{
int i;
gpio_direction_output(GPIO_SCL, 1);
gpio_direction_output(GPIO_SDA, 1);
for (i = 0; i < 8; i++) {
set_scl(0);
set_sda(control_value & (0x80 >> i)); /* MSB first */
set_scl(1); /* active edge */
}
set_str(1);
set_str(0);
set_scl(0);
set_sda(1); /* Be ready for START */
set_scl(1);
}
static void (*set_carrier_cb_tab[2])(void *pdev, int carrier);
static int hss_set_clock(int port, unsigned int clock_type)
{
int ctrl_int = port ? CONTROL_HSS1_CLK_INT : CONTROL_HSS0_CLK_INT;
switch (clock_type) {
case CLOCK_DEFAULT:
case CLOCK_EXT:
set_control(ctrl_int, 0);
output_control();
return CLOCK_EXT;
case CLOCK_INT:
set_control(ctrl_int, 1);
output_control();
return CLOCK_INT;
default:
return -EINVAL;
}
}
static irqreturn_t hss_dcd_irq(int irq, void *pdev)
{
int port = (irq == IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N));
int i = gpio_get_value(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N);
set_carrier_cb_tab[port](pdev, !i);
return IRQ_HANDLED;
}
static int hss_open(int port, void *pdev,
void (*set_carrier_cb)(void *pdev, int carrier))
{
int i, irq;
if (!port)
irq = IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N);
else
irq = IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N);
i = gpio_get_value(port ? GPIO_HSS1_DCD_N : GPIO_HSS0_DCD_N);
set_carrier_cb(pdev, !i);
set_carrier_cb_tab[!!port] = set_carrier_cb;
if ((i = request_irq(irq, hss_dcd_irq, 0, "IXP4xx HSS", pdev)) != 0) {
printk(KERN_ERR "ixp4xx_hss: failed to request IRQ%i (%i)\n",
irq, i);
return i;
}
set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 0);
output_control();
gpio_set_value(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 0);
return 0;
}
static void hss_close(int port, void *pdev)
{
free_irq(port ? IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N) :
IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), pdev);
set_carrier_cb_tab[!!port] = NULL; /* catch bugs */
set_control(port ? CONTROL_HSS1_DTR_N : CONTROL_HSS0_DTR_N, 1);
output_control();
gpio_set_value(port ? GPIO_HSS1_RTS_N : GPIO_HSS0_RTS_N, 1);
}
/* Flash memory */
static struct flash_platform_data flash_data = {
.map_name = "cfi_probe",
.width = 2,
};
static struct resource flash_resource = {
.flags = IORESOURCE_MEM,
};
static struct platform_device device_flash = {
.name = "IXP4XX-Flash",
.id = 0,
.dev = { .platform_data = &flash_data },
.num_resources = 1,
.resource = &flash_resource,
};
/* IXP425 2 UART ports */
static struct resource uart_resources[] = {
{
.start = IXP4XX_UART1_BASE_PHYS,
.end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
.flags = IORESOURCE_MEM,
},
{
.start = IXP4XX_UART2_BASE_PHYS,
.end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
.flags = IORESOURCE_MEM,
}
};
static struct plat_serial8250_port uart_data[] = {
{
.mapbase = IXP4XX_UART1_BASE_PHYS,
.membase = (char __iomem *)IXP4XX_UART1_BASE_VIRT +
REG_OFFSET,
.irq = IRQ_IXP4XX_UART1,
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
},
{
.mapbase = IXP4XX_UART2_BASE_PHYS,
.membase = (char __iomem *)IXP4XX_UART2_BASE_VIRT +
REG_OFFSET,
.irq = IRQ_IXP4XX_UART2,
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
.iotype = UPIO_MEM,
.regshift = 2,
.uartclk = IXP4XX_UART_XTAL,
},
{ },
};
static struct platform_device device_uarts = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
.dev.platform_data = uart_data,
.num_resources = 2,
.resource = uart_resources,
};
/* Built-in 10/100 Ethernet MAC interfaces */
static struct eth_plat_info eth_plat[] = {
{
.phy = 0,
.rxq = 3,
.txreadyq = 32,
}, {
.phy = 1,
.rxq = 4,
.txreadyq = 33,
}
};
static struct platform_device device_eth_tab[] = {
{
.name = "ixp4xx_eth",
.id = IXP4XX_ETH_NPEB,
.dev.platform_data = eth_plat,
}, {
.name = "ixp4xx_eth",
.id = IXP4XX_ETH_NPEC,
.dev.platform_data = eth_plat + 1,
}
};
/* IXP425 2 synchronous serial ports */
static struct hss_plat_info hss_plat[] = {
{
.set_clock = hss_set_clock,
.open = hss_open,
.close = hss_close,
.txreadyq = 34,
}, {
.set_clock = hss_set_clock,
.open = hss_open,
.close = hss_close,
.txreadyq = 35,
}
};
static struct platform_device device_hss_tab[] = {
{
.name = "ixp4xx_hss",
.id = 0,
.dev.platform_data = hss_plat,
}, {
.name = "ixp4xx_hss",
.id = 1,
.dev.platform_data = hss_plat + 1,
}
};
static struct platform_device *device_tab[7] __initdata = {
&device_flash, /* index 0 */
};
static inline u8 __init flash_readb(u8 __iomem *flash, u32 addr)
{
#ifdef __ARMEB__
return __raw_readb(flash + addr);
#else
return __raw_readb(flash + (addr ^ 3));
#endif
}
static inline u16 __init flash_readw(u8 __iomem *flash, u32 addr)
{
#ifdef __ARMEB__
return __raw_readw(flash + addr);
#else
return __raw_readw(flash + (addr ^ 2));
#endif
}
static void __init gmlr_init(void)
{
u8 __iomem *flash;
int i, devices = 1; /* flash */
ixp4xx_sys_init();
if ((flash = ioremap(IXP4XX_EXP_BUS_BASE_PHYS, 0x80)) == NULL)
printk(KERN_ERR "goramo-mlr: unable to access system"
" configuration data\n");
else {
system_rev = __raw_readl(flash + CFG_REV);
hw_bits = __raw_readl(flash + CFG_HW_BITS);
for (i = 0; i < ETH_ALEN; i++) {
eth_plat[0].hwaddr[i] =
flash_readb(flash, CFG_ETH0_ADDRESS + i);
eth_plat[1].hwaddr[i] =
flash_readb(flash, CFG_ETH1_ADDRESS + i);
}
__raw_writew(FLASH_CMD_READ_ID, flash);
system_serial_high = flash_readw(flash, FLASH_SER_OFF);
system_serial_high <<= 16;
system_serial_high |= flash_readw(flash, FLASH_SER_OFF + 2);
system_serial_low = flash_readw(flash, FLASH_SER_OFF + 4);
system_serial_low <<= 16;
system_serial_low |= flash_readw(flash, FLASH_SER_OFF + 6);
__raw_writew(FLASH_CMD_READ_ARRAY, flash);
iounmap(flash);
}
switch (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1)) {
case CFG_HW_HAS_UART0:
memset(&uart_data[1], 0, sizeof(uart_data[1]));
device_uarts.num_resources = 1;
break;
case CFG_HW_HAS_UART1:
device_uarts.dev.platform_data = &uart_data[1];
device_uarts.resource = &uart_resources[1];
device_uarts.num_resources = 1;
break;
}
if (hw_bits & (CFG_HW_HAS_UART0 | CFG_HW_HAS_UART1))
device_tab[devices++] = &device_uarts; /* max index 1 */
if (hw_bits & CFG_HW_HAS_ETH0)
device_tab[devices++] = &device_eth_tab[0]; /* max index 2 */
if (hw_bits & CFG_HW_HAS_ETH1)
device_tab[devices++] = &device_eth_tab[1]; /* max index 3 */
if (hw_bits & CFG_HW_HAS_HSS0)
device_tab[devices++] = &device_hss_tab[0]; /* max index 4 */
if (hw_bits & CFG_HW_HAS_HSS1)
device_tab[devices++] = &device_hss_tab[1]; /* max index 5 */
gpio_request(GPIO_SCL, "SCL/clock");
gpio_request(GPIO_SDA, "SDA/data");
gpio_request(GPIO_STR, "strobe");
gpio_request(GPIO_HSS0_RTS_N, "HSS0 RTS");
gpio_request(GPIO_HSS1_RTS_N, "HSS1 RTS");
gpio_request(GPIO_HSS0_DCD_N, "HSS0 DCD");
gpio_request(GPIO_HSS1_DCD_N, "HSS1 DCD");
gpio_direction_output(GPIO_SCL, 1);
gpio_direction_output(GPIO_SDA, 1);
gpio_direction_output(GPIO_STR, 0);
gpio_direction_output(GPIO_HSS0_RTS_N, 1);
gpio_direction_output(GPIO_HSS1_RTS_N, 1);
gpio_direction_input(GPIO_HSS0_DCD_N);
gpio_direction_input(GPIO_HSS1_DCD_N);
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS0_DCD_N), IRQ_TYPE_EDGE_BOTH);
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_HSS1_DCD_N), IRQ_TYPE_EDGE_BOTH);
set_control(CONTROL_HSS0_DTR_N, 1);
set_control(CONTROL_HSS1_DTR_N, 1);
set_control(CONTROL_EEPROM_WC_N, 1);
set_control(CONTROL_PCI_RESET_N, 1);
output_control();
msleep(1); /* Wait for PCI devices to initialize */
flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
platform_add_devices(device_tab, devices);
}
#ifdef CONFIG_PCI
static void __init gmlr_pci_preinit(void)
{
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA), IRQ_TYPE_LEVEL_LOW);
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB), IRQ_TYPE_LEVEL_LOW);
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC), IRQ_TYPE_LEVEL_LOW);
irq_set_irq_type(IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI), IRQ_TYPE_LEVEL_LOW);
ixp4xx_pci_preinit();
}
static void __init gmlr_pci_postinit(void)
{
if ((hw_bits & CFG_HW_USB_PORTS) >= 2 &&
(hw_bits & CFG_HW_USB_PORTS) < 5) {
/* need to adjust number of USB ports on NEC chip */
u32 value, addr = BIT(32 - SLOT_NEC) | 0xE0;
if (!ixp4xx_pci_read(addr, NP_CMD_CONFIGREAD, &value)) {
value &= ~7;
value |= (hw_bits & CFG_HW_USB_PORTS);
ixp4xx_pci_write(addr, NP_CMD_CONFIGWRITE, value);
}
}
}
static int __init gmlr_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
switch(slot) {
case SLOT_ETHA: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHA);
case SLOT_ETHB: return IXP4XX_GPIO_IRQ(GPIO_IRQ_ETHB);
case SLOT_NEC: return IXP4XX_GPIO_IRQ(GPIO_IRQ_NEC);
default: return IXP4XX_GPIO_IRQ(GPIO_IRQ_MPCI);
}
}
static struct hw_pci gmlr_hw_pci __initdata = {
.nr_controllers = 1,
.ops = &ixp4xx_ops,
.preinit = gmlr_pci_preinit,
.postinit = gmlr_pci_postinit,
.setup = ixp4xx_setup,
.map_irq = gmlr_map_irq,
};
static int __init gmlr_pci_init(void)
{
if (machine_is_goramo_mlr() &&
(hw_bits & (CFG_HW_USB_PORTS | CFG_HW_HAS_PCI_SLOT)))
pci_common_init(&gmlr_hw_pci);
return 0;
}
subsys_initcall(gmlr_pci_init);
#endif /* CONFIG_PCI */
MACHINE_START(GORAMO_MLR, "MultiLink")
/* Maintainer: Krzysztof Halasa */
.map_io = ixp4xx_map_io,
.init_early = ixp4xx_init_early,
.init_irq = ixp4xx_init_irq,
.init_time = ixp4xx_timer_init,
.atag_offset = 0x100,
.init_machine = gmlr_init,
#if defined(CONFIG_PCI)
.dma_zone_size = SZ_64M,
#endif
.restart = ixp4xx_restart,
MACHINE_END
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