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403 lines
10 KiB
403 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* at91_cf.c -- AT91 CompactFlash controller driver |
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* |
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* Copyright (C) 2005 David Brownell |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/platform_device.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/slab.h> |
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#include <linux/gpio.h> |
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#include <linux/io.h> |
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#include <linux/sizes.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/mfd/syscon/atmel-mc.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/of_gpio.h> |
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#include <linux/regmap.h> |
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#include <pcmcia/ss.h> |
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/* |
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* A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW; |
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* some other bit in {A24,A22..A11} is nREG to flag memory access |
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* (vs attributes). So more than 2KB/region would just be waste. |
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* Note: These are offsets from the physical base address. |
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*/ |
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#define CF_ATTR_PHYS (0) |
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#define CF_IO_PHYS (1 << 23) |
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#define CF_MEM_PHYS (0x017ff800) |
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struct at91_cf_data { |
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int irq_pin; /* I/O IRQ */ |
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int det_pin; /* Card detect */ |
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int vcc_pin; /* power switching */ |
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int rst_pin; /* card reset */ |
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u8 chipselect; /* EBI Chip Select number */ |
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u8 flags; |
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#define AT91_CF_TRUE_IDE 0x01 |
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#define AT91_IDE_SWAP_A0_A2 0x02 |
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}; |
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struct regmap *mc; |
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/*--------------------------------------------------------------------------*/ |
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struct at91_cf_socket { |
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struct pcmcia_socket socket; |
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unsigned present:1; |
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struct platform_device *pdev; |
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struct at91_cf_data *board; |
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unsigned long phys_baseaddr; |
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}; |
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static inline int at91_cf_present(struct at91_cf_socket *cf) |
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{ |
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return !gpio_get_value(cf->board->det_pin); |
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} |
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/*--------------------------------------------------------------------------*/ |
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static int at91_cf_ss_init(struct pcmcia_socket *s) |
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{ |
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return 0; |
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} |
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static irqreturn_t at91_cf_irq(int irq, void *_cf) |
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{ |
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struct at91_cf_socket *cf = _cf; |
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if (irq == gpio_to_irq(cf->board->det_pin)) { |
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unsigned present = at91_cf_present(cf); |
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/* kick pccard as needed */ |
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if (present != cf->present) { |
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cf->present = present; |
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dev_dbg(&cf->pdev->dev, "card %s\n", |
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present ? "present" : "gone"); |
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pcmcia_parse_events(&cf->socket, SS_DETECT); |
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} |
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} |
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return IRQ_HANDLED; |
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} |
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static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp) |
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{ |
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struct at91_cf_socket *cf; |
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if (!sp) |
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return -EINVAL; |
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cf = container_of(s, struct at91_cf_socket, socket); |
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/* NOTE: CF is always 3VCARD */ |
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if (at91_cf_present(cf)) { |
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int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */ |
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int vcc = gpio_is_valid(cf->board->vcc_pin); |
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*sp = SS_DETECT | SS_3VCARD; |
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if (!rdy || gpio_get_value(cf->board->irq_pin)) |
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*sp |= SS_READY; |
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if (!vcc || gpio_get_value(cf->board->vcc_pin)) |
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*sp |= SS_POWERON; |
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} else |
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*sp = 0; |
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return 0; |
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} |
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static int |
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at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) |
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{ |
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struct at91_cf_socket *cf; |
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cf = container_of(sock, struct at91_cf_socket, socket); |
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/* switch Vcc if needed and possible */ |
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if (gpio_is_valid(cf->board->vcc_pin)) { |
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switch (s->Vcc) { |
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case 0: |
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gpio_set_value(cf->board->vcc_pin, 0); |
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break; |
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case 33: |
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gpio_set_value(cf->board->vcc_pin, 1); |
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break; |
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default: |
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return -EINVAL; |
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} |
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} |
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/* toggle reset if needed */ |
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gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET); |
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dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n", |
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s->Vcc, s->io_irq, s->flags, s->csc_mask); |
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return 0; |
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} |
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static int at91_cf_ss_suspend(struct pcmcia_socket *s) |
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{ |
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return at91_cf_set_socket(s, &dead_socket); |
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} |
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/* we already mapped the I/O region */ |
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static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) |
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{ |
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struct at91_cf_socket *cf; |
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u32 csr; |
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cf = container_of(s, struct at91_cf_socket, socket); |
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io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ); |
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/* |
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* Use 16 bit accesses unless/until we need 8-bit i/o space. |
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* |
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* NOTE: this CF controller ignores IOIS16, so we can't really do |
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* MAP_AUTOSZ. The 16bit mode allows single byte access on either |
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* D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many |
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* purposes (and handles ide-cs). |
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* |
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* The 8bit mode is needed for odd byte access on D0-D7. It seems |
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* some cards only like that way to get at the odd byte, despite |
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* CF 3.0 spec table 35 also giving the D8-D15 option. |
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*/ |
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if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) { |
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csr = AT91_MC_SMC_DBW_8; |
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dev_dbg(&cf->pdev->dev, "8bit i/o bus\n"); |
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} else { |
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csr = AT91_MC_SMC_DBW_16; |
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dev_dbg(&cf->pdev->dev, "16bit i/o bus\n"); |
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} |
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regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect), |
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AT91_MC_SMC_DBW, csr); |
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io->start = cf->socket.io_offset; |
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io->stop = io->start + SZ_2K - 1; |
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return 0; |
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} |
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/* pcmcia layer maps/unmaps mem regions */ |
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static int |
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at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) |
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{ |
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struct at91_cf_socket *cf; |
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if (map->card_start) |
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return -EINVAL; |
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cf = container_of(s, struct at91_cf_socket, socket); |
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map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT); |
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if (map->flags & MAP_ATTRIB) |
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map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS; |
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else |
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map->static_start = cf->phys_baseaddr + CF_MEM_PHYS; |
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return 0; |
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} |
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static struct pccard_operations at91_cf_ops = { |
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.init = at91_cf_ss_init, |
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.suspend = at91_cf_ss_suspend, |
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.get_status = at91_cf_get_status, |
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.set_socket = at91_cf_set_socket, |
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.set_io_map = at91_cf_set_io_map, |
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.set_mem_map = at91_cf_set_mem_map, |
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}; |
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/*--------------------------------------------------------------------------*/ |
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static const struct of_device_id at91_cf_dt_ids[] = { |
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{ .compatible = "atmel,at91rm9200-cf" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, at91_cf_dt_ids); |
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static int at91_cf_probe(struct platform_device *pdev) |
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{ |
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struct at91_cf_socket *cf; |
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struct at91_cf_data *board; |
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struct resource *io; |
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int status; |
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board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL); |
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if (!board) |
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return -ENOMEM; |
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board->irq_pin = of_get_gpio(pdev->dev.of_node, 0); |
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board->det_pin = of_get_gpio(pdev->dev.of_node, 1); |
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board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2); |
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board->rst_pin = of_get_gpio(pdev->dev.of_node, 3); |
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mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc"); |
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if (IS_ERR(mc)) |
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return PTR_ERR(mc); |
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if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin)) |
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return -ENODEV; |
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io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!io) |
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return -ENODEV; |
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cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL); |
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if (!cf) |
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return -ENOMEM; |
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cf->board = board; |
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cf->pdev = pdev; |
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cf->phys_baseaddr = io->start; |
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platform_set_drvdata(pdev, cf); |
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/* must be a GPIO; ergo must trigger on both edges */ |
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status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det"); |
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if (status < 0) |
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return status; |
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status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin), |
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at91_cf_irq, 0, "at91_cf detect", cf); |
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if (status < 0) |
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return status; |
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device_init_wakeup(&pdev->dev, 1); |
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status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst"); |
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if (status < 0) |
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goto fail0a; |
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if (gpio_is_valid(board->vcc_pin)) { |
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status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc"); |
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if (status < 0) |
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goto fail0a; |
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} |
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/* |
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* The card driver will request this irq later as needed. |
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* but it causes lots of "irqNN: nobody cared" messages |
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* unless we report that we handle everything (sigh). |
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* (Note: DK board doesn't wire the IRQ pin...) |
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*/ |
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if (gpio_is_valid(board->irq_pin)) { |
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status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq"); |
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if (status < 0) |
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goto fail0a; |
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status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin), |
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at91_cf_irq, IRQF_SHARED, "at91_cf", cf); |
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if (status < 0) |
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goto fail0a; |
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cf->socket.pci_irq = gpio_to_irq(board->irq_pin); |
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} else |
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cf->socket.pci_irq = nr_irqs + 1; |
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/* |
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* pcmcia layer only remaps "real" memory not iospace |
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* io_offset is set to 0x10000 to avoid the check in static_find_io(). |
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* */ |
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cf->socket.io_offset = 0x10000; |
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status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS); |
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if (status) |
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goto fail0a; |
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/* reserve chip-select regions */ |
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if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) { |
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status = -ENXIO; |
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goto fail0a; |
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} |
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dev_info(&pdev->dev, "irqs det #%d, io #%d\n", |
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gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin)); |
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cf->socket.owner = THIS_MODULE; |
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cf->socket.dev.parent = &pdev->dev; |
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cf->socket.ops = &at91_cf_ops; |
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cf->socket.resource_ops = &pccard_static_ops; |
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cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
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| SS_CAP_MEM_ALIGN; |
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cf->socket.map_size = SZ_2K; |
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cf->socket.io[0].res = io; |
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status = pcmcia_register_socket(&cf->socket); |
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if (status < 0) |
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goto fail0a; |
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return 0; |
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fail0a: |
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device_init_wakeup(&pdev->dev, 0); |
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return status; |
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} |
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static int at91_cf_remove(struct platform_device *pdev) |
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{ |
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struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
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pcmcia_unregister_socket(&cf->socket); |
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device_init_wakeup(&pdev->dev, 0); |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg) |
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{ |
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struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
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struct at91_cf_data *board = cf->board; |
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if (device_may_wakeup(&pdev->dev)) { |
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enable_irq_wake(gpio_to_irq(board->det_pin)); |
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if (gpio_is_valid(board->irq_pin)) |
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enable_irq_wake(gpio_to_irq(board->irq_pin)); |
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} |
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return 0; |
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} |
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static int at91_cf_resume(struct platform_device *pdev) |
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{ |
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struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
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struct at91_cf_data *board = cf->board; |
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if (device_may_wakeup(&pdev->dev)) { |
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disable_irq_wake(gpio_to_irq(board->det_pin)); |
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if (gpio_is_valid(board->irq_pin)) |
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disable_irq_wake(gpio_to_irq(board->irq_pin)); |
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} |
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return 0; |
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} |
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#else |
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#define at91_cf_suspend NULL |
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#define at91_cf_resume NULL |
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#endif |
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static struct platform_driver at91_cf_driver = { |
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.driver = { |
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.name = "at91_cf", |
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.of_match_table = at91_cf_dt_ids, |
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}, |
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.probe = at91_cf_probe, |
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.remove = at91_cf_remove, |
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.suspend = at91_cf_suspend, |
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.resume = at91_cf_resume, |
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}; |
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module_platform_driver(at91_cf_driver); |
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MODULE_DESCRIPTION("AT91 Compact Flash Driver"); |
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MODULE_AUTHOR("David Brownell"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:at91_cf");
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