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395 lines
9.3 KiB
395 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* 8250_mid.c - Driver for UART on Intel Penwell and various other Intel SOCs |
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* |
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* Copyright (C) 2015 Intel Corporation |
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* Author: Heikki Krogerus <[email protected]> |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/rational.h> |
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#include <linux/dma/hsu.h> |
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#include <linux/8250_pci.h> |
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#include "8250.h" |
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#define PCI_DEVICE_ID_INTEL_PNW_UART1 0x081b |
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#define PCI_DEVICE_ID_INTEL_PNW_UART2 0x081c |
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#define PCI_DEVICE_ID_INTEL_PNW_UART3 0x081d |
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#define PCI_DEVICE_ID_INTEL_TNG_UART 0x1191 |
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#define PCI_DEVICE_ID_INTEL_CDF_UART 0x18d8 |
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#define PCI_DEVICE_ID_INTEL_DNV_UART 0x19d8 |
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/* Intel MID Specific registers */ |
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#define INTEL_MID_UART_FISR 0x08 |
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#define INTEL_MID_UART_PS 0x30 |
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#define INTEL_MID_UART_MUL 0x34 |
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#define INTEL_MID_UART_DIV 0x38 |
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struct mid8250; |
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struct mid8250_board { |
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unsigned int flags; |
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unsigned long freq; |
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unsigned int base_baud; |
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int (*setup)(struct mid8250 *, struct uart_port *p); |
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void (*exit)(struct mid8250 *); |
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}; |
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struct mid8250 { |
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int line; |
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int dma_index; |
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struct pci_dev *dma_dev; |
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struct uart_8250_dma dma; |
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struct mid8250_board *board; |
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struct hsu_dma_chip dma_chip; |
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}; |
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/*****************************************************************************/ |
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static int pnw_setup(struct mid8250 *mid, struct uart_port *p) |
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{ |
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struct pci_dev *pdev = to_pci_dev(p->dev); |
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switch (pdev->device) { |
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case PCI_DEVICE_ID_INTEL_PNW_UART1: |
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mid->dma_index = 0; |
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break; |
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case PCI_DEVICE_ID_INTEL_PNW_UART2: |
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mid->dma_index = 1; |
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break; |
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case PCI_DEVICE_ID_INTEL_PNW_UART3: |
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mid->dma_index = 2; |
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break; |
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default: |
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return -EINVAL; |
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} |
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mid->dma_dev = pci_get_slot(pdev->bus, |
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PCI_DEVFN(PCI_SLOT(pdev->devfn), 3)); |
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return 0; |
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} |
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static int tng_handle_irq(struct uart_port *p) |
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{ |
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struct mid8250 *mid = p->private_data; |
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struct uart_8250_port *up = up_to_u8250p(p); |
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struct hsu_dma_chip *chip; |
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u32 status; |
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int ret = 0; |
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int err; |
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chip = pci_get_drvdata(mid->dma_dev); |
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/* Rx DMA */ |
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err = hsu_dma_get_status(chip, mid->dma_index * 2 + 1, &status); |
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if (err > 0) { |
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serial8250_rx_dma_flush(up); |
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ret |= 1; |
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} else if (err == 0) |
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ret |= hsu_dma_do_irq(chip, mid->dma_index * 2 + 1, status); |
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/* Tx DMA */ |
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err = hsu_dma_get_status(chip, mid->dma_index * 2, &status); |
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if (err > 0) |
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ret |= 1; |
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else if (err == 0) |
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ret |= hsu_dma_do_irq(chip, mid->dma_index * 2, status); |
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/* UART */ |
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ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR)); |
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return IRQ_RETVAL(ret); |
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} |
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static int tng_setup(struct mid8250 *mid, struct uart_port *p) |
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{ |
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struct pci_dev *pdev = to_pci_dev(p->dev); |
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int index = PCI_FUNC(pdev->devfn); |
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/* |
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* Device 0000:00:04.0 is not a real HSU port. It provides a global |
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* register set for all HSU ports, although it has the same PCI ID. |
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* Skip it here. |
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*/ |
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if (index-- == 0) |
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return -ENODEV; |
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mid->dma_index = index; |
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mid->dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(5, 0)); |
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p->handle_irq = tng_handle_irq; |
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return 0; |
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} |
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static int dnv_handle_irq(struct uart_port *p) |
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{ |
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struct mid8250 *mid = p->private_data; |
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struct uart_8250_port *up = up_to_u8250p(p); |
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unsigned int fisr = serial_port_in(p, INTEL_MID_UART_FISR); |
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u32 status; |
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int ret = 0; |
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int err; |
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if (fisr & BIT(2)) { |
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err = hsu_dma_get_status(&mid->dma_chip, 1, &status); |
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if (err > 0) { |
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serial8250_rx_dma_flush(up); |
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ret |= 1; |
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} else if (err == 0) |
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ret |= hsu_dma_do_irq(&mid->dma_chip, 1, status); |
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} |
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if (fisr & BIT(1)) { |
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err = hsu_dma_get_status(&mid->dma_chip, 0, &status); |
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if (err > 0) |
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ret |= 1; |
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else if (err == 0) |
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ret |= hsu_dma_do_irq(&mid->dma_chip, 0, status); |
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} |
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if (fisr & BIT(0)) |
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ret |= serial8250_handle_irq(p, serial_port_in(p, UART_IIR)); |
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return IRQ_RETVAL(ret); |
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} |
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#define DNV_DMA_CHAN_OFFSET 0x80 |
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static int dnv_setup(struct mid8250 *mid, struct uart_port *p) |
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{ |
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struct hsu_dma_chip *chip = &mid->dma_chip; |
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struct pci_dev *pdev = to_pci_dev(p->dev); |
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unsigned int bar = FL_GET_BASE(mid->board->flags); |
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int ret; |
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pci_set_master(pdev); |
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ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); |
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if (ret < 0) |
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return ret; |
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p->irq = pci_irq_vector(pdev, 0); |
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chip->dev = &pdev->dev; |
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chip->irq = pci_irq_vector(pdev, 0); |
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chip->regs = p->membase; |
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chip->length = pci_resource_len(pdev, bar); |
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chip->offset = DNV_DMA_CHAN_OFFSET; |
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/* Falling back to PIO mode if DMA probing fails */ |
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ret = hsu_dma_probe(chip); |
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if (ret) |
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return 0; |
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mid->dma_dev = pdev; |
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p->handle_irq = dnv_handle_irq; |
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return 0; |
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} |
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static void dnv_exit(struct mid8250 *mid) |
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{ |
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if (!mid->dma_dev) |
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return; |
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hsu_dma_remove(&mid->dma_chip); |
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} |
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/*****************************************************************************/ |
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static void mid8250_set_termios(struct uart_port *p, |
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struct ktermios *termios, |
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struct ktermios *old) |
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{ |
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unsigned int baud = tty_termios_baud_rate(termios); |
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struct mid8250 *mid = p->private_data; |
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unsigned short ps = 16; |
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unsigned long fuart = baud * ps; |
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unsigned long w = BIT(24) - 1; |
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unsigned long mul, div; |
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/* Gracefully handle the B0 case: fall back to B9600 */ |
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fuart = fuart ? fuart : 9600 * 16; |
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if (mid->board->freq < fuart) { |
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/* Find prescaler value that satisfies Fuart < Fref */ |
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if (mid->board->freq > baud) |
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ps = mid->board->freq / baud; /* baud rate too high */ |
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else |
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ps = 1; /* PLL case */ |
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fuart = baud * ps; |
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} else { |
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/* Get Fuart closer to Fref */ |
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fuart *= rounddown_pow_of_two(mid->board->freq / fuart); |
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} |
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rational_best_approximation(fuart, mid->board->freq, w, w, &mul, &div); |
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p->uartclk = fuart * 16 / ps; /* core uses ps = 16 always */ |
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writel(ps, p->membase + INTEL_MID_UART_PS); /* set PS */ |
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writel(mul, p->membase + INTEL_MID_UART_MUL); /* set MUL */ |
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writel(div, p->membase + INTEL_MID_UART_DIV); |
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serial8250_do_set_termios(p, termios, old); |
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} |
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static bool mid8250_dma_filter(struct dma_chan *chan, void *param) |
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{ |
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struct hsu_dma_slave *s = param; |
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if (s->dma_dev != chan->device->dev || s->chan_id != chan->chan_id) |
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return false; |
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chan->private = s; |
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return true; |
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} |
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static int mid8250_dma_setup(struct mid8250 *mid, struct uart_8250_port *port) |
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{ |
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struct uart_8250_dma *dma = &mid->dma; |
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struct device *dev = port->port.dev; |
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struct hsu_dma_slave *rx_param; |
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struct hsu_dma_slave *tx_param; |
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if (!mid->dma_dev) |
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return 0; |
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rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL); |
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if (!rx_param) |
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return -ENOMEM; |
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tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL); |
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if (!tx_param) |
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return -ENOMEM; |
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rx_param->chan_id = mid->dma_index * 2 + 1; |
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tx_param->chan_id = mid->dma_index * 2; |
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dma->rxconf.src_maxburst = 64; |
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dma->txconf.dst_maxburst = 64; |
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rx_param->dma_dev = &mid->dma_dev->dev; |
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tx_param->dma_dev = &mid->dma_dev->dev; |
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dma->fn = mid8250_dma_filter; |
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dma->rx_param = rx_param; |
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dma->tx_param = tx_param; |
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port->dma = dma; |
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return 0; |
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} |
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static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
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{ |
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struct uart_8250_port uart; |
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struct mid8250 *mid; |
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unsigned int bar; |
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int ret; |
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ret = pcim_enable_device(pdev); |
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if (ret) |
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return ret; |
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mid = devm_kzalloc(&pdev->dev, sizeof(*mid), GFP_KERNEL); |
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if (!mid) |
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return -ENOMEM; |
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mid->board = (struct mid8250_board *)id->driver_data; |
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bar = FL_GET_BASE(mid->board->flags); |
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memset(&uart, 0, sizeof(struct uart_8250_port)); |
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uart.port.dev = &pdev->dev; |
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uart.port.irq = pdev->irq; |
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uart.port.private_data = mid; |
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uart.port.type = PORT_16750; |
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uart.port.iotype = UPIO_MEM; |
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uart.port.uartclk = mid->board->base_baud * 16; |
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uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE; |
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uart.port.set_termios = mid8250_set_termios; |
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uart.port.mapbase = pci_resource_start(pdev, bar); |
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uart.port.membase = pcim_iomap(pdev, bar, 0); |
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if (!uart.port.membase) |
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return -ENOMEM; |
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if (mid->board->setup) { |
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ret = mid->board->setup(mid, &uart.port); |
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if (ret) |
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return ret; |
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} |
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ret = mid8250_dma_setup(mid, &uart); |
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if (ret) |
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goto err; |
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ret = serial8250_register_8250_port(&uart); |
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if (ret < 0) |
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goto err; |
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mid->line = ret; |
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pci_set_drvdata(pdev, mid); |
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return 0; |
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err: |
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if (mid->board->exit) |
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mid->board->exit(mid); |
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return ret; |
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} |
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static void mid8250_remove(struct pci_dev *pdev) |
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{ |
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struct mid8250 *mid = pci_get_drvdata(pdev); |
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serial8250_unregister_port(mid->line); |
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if (mid->board->exit) |
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mid->board->exit(mid); |
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} |
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static const struct mid8250_board pnw_board = { |
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.flags = FL_BASE0, |
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.freq = 50000000, |
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.base_baud = 115200, |
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.setup = pnw_setup, |
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}; |
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static const struct mid8250_board tng_board = { |
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.flags = FL_BASE0, |
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.freq = 38400000, |
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.base_baud = 1843200, |
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.setup = tng_setup, |
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}; |
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static const struct mid8250_board dnv_board = { |
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.flags = FL_BASE1, |
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.freq = 133333333, |
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.base_baud = 115200, |
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.setup = dnv_setup, |
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.exit = dnv_exit, |
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}; |
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#define MID_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board } |
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static const struct pci_device_id pci_ids[] = { |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART1, pnw_board), |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART2, pnw_board), |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART3, pnw_board), |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_TNG_UART, tng_board), |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_CDF_UART, dnv_board), |
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MID_DEVICE(PCI_DEVICE_ID_INTEL_DNV_UART, dnv_board), |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(pci, pci_ids); |
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static struct pci_driver mid8250_pci_driver = { |
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.name = "8250_mid", |
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.id_table = pci_ids, |
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.probe = mid8250_probe, |
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.remove = mid8250_remove, |
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}; |
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module_pci_driver(mid8250_pci_driver); |
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MODULE_AUTHOR("Intel Corporation"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("Intel MID UART driver");
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