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misc: keba: Add UART devices

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Add support for the UART auxiliary devices. This enables access to up to
3 different UARTs, which are implemented in the FPGA.

Signed-off-by: Gerhard Engleder <eg@keba.com>
Link: https://lore.kernel.org/r/20241011191257.19702-9-gerhard@engleder-embedded.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gerhard Engleder 2024-10-11 21:12:57 +02:00 committed by Greg Kroah-Hartman
parent ca7b844b91
commit a27b406a49
2 changed files with 116 additions and 0 deletions
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104
drivers/misc/keba/cp500.c
View File

@ -46,6 +46,9 @@
/* MSIX */
#define CP500_AXI_MSIX 3
#define CP500_RFB_UART_MSIX 4
#define CP500_DEBUG_UART_MSIX 5
#define CP500_SI1_UART_MSIX 6
#define CP500_NUM_MSIX 8
#define CP500_NUM_MSIX_NO_MMI 2
#define CP500_NUM_MSIX_NO_AXI 3
@ -75,6 +78,7 @@
struct cp500_dev_info {
off_t offset;
size_t size;
unsigned int msix;
};
struct cp500_devs {
@ -83,6 +87,9 @@ struct cp500_devs {
struct cp500_dev_info i2c;
struct cp500_dev_info fan;
struct cp500_dev_info batt;
struct cp500_dev_info uart0_rfb;
struct cp500_dev_info uart1_dbg;
struct cp500_dev_info uart2_si1;
};
/* list of devices within FPGA of CP035 family (CP035, CP056, CP057) */
@ -92,6 +99,8 @@ static struct cp500_devs cp035_devices = {
.i2c = { 0x4000, SZ_4K },
.fan = { 0x9000, SZ_4K },
.batt = { 0xA000, SZ_4K },
.uart0_rfb = { 0xB000, SZ_4K, CP500_RFB_UART_MSIX },
.uart2_si1 = { 0xD000, SZ_4K, CP500_SI1_UART_MSIX },
};
/* list of devices within FPGA of CP505 family (CP503, CP505, CP507) */
@ -101,6 +110,8 @@ static struct cp500_devs cp505_devices = {
.i2c = { 0x5000, SZ_4K },
.fan = { 0x9000, SZ_4K },
.batt = { 0xA000, SZ_4K },
.uart0_rfb = { 0xB000, SZ_4K, CP500_RFB_UART_MSIX },
.uart2_si1 = { 0xD000, SZ_4K, CP500_SI1_UART_MSIX },
};
/* list of devices within FPGA of CP520 family (CP520, CP530) */
@ -110,6 +121,8 @@ static struct cp500_devs cp520_devices = {
.i2c = { 0x5000, SZ_4K },
.fan = { 0x8000, SZ_4K },
.batt = { 0x9000, SZ_4K },
.uart0_rfb = { 0xC000, SZ_4K, CP500_RFB_UART_MSIX },
.uart1_dbg = { 0xD000, SZ_4K, CP500_DEBUG_UART_MSIX },
};
struct cp500_nvmem {
@ -135,6 +148,9 @@ struct cp500 {
struct keba_i2c_auxdev *i2c;
struct keba_fan_auxdev *fan;
struct keba_batt_auxdev *batt;
struct keba_uart_auxdev *uart0_rfb;
struct keba_uart_auxdev *uart1_dbg;
struct keba_uart_auxdev *uart2_si1;
/* ECM EtherCAT BAR */
resource_size_t ecm_hwbase;
@ -510,6 +526,55 @@ static int cp500_register_batt(struct cp500 *cp500)
return 0;
}
static void cp500_uart_release(struct device *dev)
{
struct keba_uart_auxdev *uart =
container_of(dev, struct keba_uart_auxdev, auxdev.dev);
kfree(uart);
}
static int cp500_register_uart(struct cp500 *cp500,
struct keba_uart_auxdev **uart, const char *name,
struct cp500_dev_info *info, unsigned int irq)
{
int ret;
*uart = kzalloc(sizeof(**uart), GFP_KERNEL);
if (!*uart)
return -ENOMEM;
(*uart)->auxdev.name = name;
(*uart)->auxdev.id = 0;
(*uart)->auxdev.dev.release = cp500_uart_release;
(*uart)->auxdev.dev.parent = &cp500->pci_dev->dev;
(*uart)->io = (struct resource) {
/* UART register area */
.start = (resource_size_t) cp500->sys_hwbase + info->offset,
.end = (resource_size_t) cp500->sys_hwbase + info->offset +
info->size - 1,
.flags = IORESOURCE_MEM,
};
(*uart)->irq = irq;
ret = auxiliary_device_init(&(*uart)->auxdev);
if (ret) {
kfree(*uart);
*uart = NULL;
return ret;
}
ret = __auxiliary_device_add(&(*uart)->auxdev, "keba");
if (ret) {
auxiliary_device_uninit(&(*uart)->auxdev);
*uart = NULL;
return ret;
}
return 0;
}
static int cp500_nvmem_read(void *priv, unsigned int offset, void *val,
size_t bytes)
{
@ -668,6 +733,33 @@ static void cp500_register_auxiliary_devs(struct cp500 *cp500)
dev_warn(dev, "Failed to register fan!\n");
if (cp500_register_batt(cp500))
dev_warn(dev, "Failed to register battery!\n");
if (cp500->devs->uart0_rfb.size &&
cp500->devs->uart0_rfb.msix < cp500->msix_num) {
int irq = pci_irq_vector(cp500->pci_dev,
cp500->devs->uart0_rfb.msix);
if (cp500_register_uart(cp500, &cp500->uart0_rfb, "rs485-uart",
&cp500->devs->uart0_rfb, irq))
dev_warn(dev, "Failed to register RFB UART!\n");
}
if (cp500->devs->uart1_dbg.size &&
cp500->devs->uart1_dbg.msix < cp500->msix_num) {
int irq = pci_irq_vector(cp500->pci_dev,
cp500->devs->uart1_dbg.msix);
if (cp500_register_uart(cp500, &cp500->uart1_dbg, "rs232-uart",
&cp500->devs->uart1_dbg, irq))
dev_warn(dev, "Failed to register debug UART!\n");
}
if (cp500->devs->uart2_si1.size &&
cp500->devs->uart2_si1.msix < cp500->msix_num) {
int irq = pci_irq_vector(cp500->pci_dev,
cp500->devs->uart2_si1.msix);
if (cp500_register_uart(cp500, &cp500->uart2_si1, "uart",
&cp500->devs->uart2_si1, irq))
dev_warn(dev, "Failed to register SI1 UART!\n");
}
}
static void cp500_unregister_dev(struct auxiliary_device *auxdev)
@ -694,6 +786,18 @@ static void cp500_unregister_auxiliary_devs(struct cp500 *cp500)
cp500_unregister_dev(&cp500->batt->auxdev);
cp500->batt = NULL;
}
if (cp500->uart0_rfb) {
cp500_unregister_dev(&cp500->uart0_rfb->auxdev);
cp500->uart0_rfb = NULL;
}
if (cp500->uart1_dbg) {
cp500_unregister_dev(&cp500->uart1_dbg->auxdev);
cp500->uart1_dbg = NULL;
}
if (cp500->uart2_si1) {
cp500_unregister_dev(&cp500->uart2_si1->auxdev);
cp500->uart2_si1 = NULL;
}
}
static irqreturn_t cp500_axi_handler(int irq, void *dev)

12
include/linux/misc/keba.h
View File

@ -57,4 +57,16 @@ struct keba_batt_auxdev {
struct resource io;
};
/**
* struct keba_uart_auxdev - KEBA UART auxiliary device
* @auxdev: auxiliary device object
* @io: address range of UART controller IO memory
* @irq: number of UART controller interrupt
*/
struct keba_uart_auxdev {
struct auxiliary_device auxdev;
struct resource io;
unsigned int irq;
};
#endif /* _LINUX_MISC_KEBA_H */