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02900f428d
Fix the following fallthrough warning: drivers/pcmcia/db1xxx_ss.c:359:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] case 3: ^ drivers/pcmcia/db1xxx_ss.c:359:2: note: insert 'break;' to avoid fall-through case 3: ^ break; This helps with the ongoing efforts to globally enable -Wimplicit-fallthrough for Clang. Link: https://github.com/KSPP/linux/issues/115 Link: https://lore.kernel.org/linux-mm/202109030839.t2llsvmc-lkp@intel.com/ Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
605 lines
16 KiB
C
605 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PCMCIA socket code for the Alchemy Db1xxx/Pb1xxx boards.
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*
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* Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
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*
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*/
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/* This is a fairly generic PCMCIA socket driver suitable for the
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* following Alchemy Development boards:
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* Db1000, Db/Pb1500, Db/Pb1100, Db/Pb1550, Db/Pb1200, Db1300
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*
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* The Db1000 is used as a reference: Per-socket card-, carddetect- and
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* statuschange IRQs connected to SoC GPIOs, control and status register
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* bits arranged in per-socket groups in an external PLD. All boards
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* listed here use this layout, including bit positions and meanings.
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* Of course there are exceptions in later boards:
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*
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* - Pb1100/Pb1500: single socket only; voltage key bits VS are
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* at STATUS[5:4] (instead of STATUS[1:0]).
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* - Au1200-based: additional card-eject irqs, irqs not gpios!
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* - Db1300: Db1200-like, no pwr ctrl, single socket (#1).
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/resource.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <pcmcia/ss.h>
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#include <asm/mach-au1x00/au1000.h>
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#include <asm/mach-db1x00/bcsr.h>
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#define MEM_MAP_SIZE 0x400000
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#define IO_MAP_SIZE 0x1000
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struct db1x_pcmcia_sock {
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struct pcmcia_socket socket;
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int nr; /* socket number */
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void *virt_io;
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phys_addr_t phys_io;
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phys_addr_t phys_attr;
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phys_addr_t phys_mem;
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/* previous flags for set_socket() */
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unsigned int old_flags;
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/* interrupt sources: linux irq numbers! */
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int insert_irq; /* default carddetect irq */
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int stschg_irq; /* card-status-change irq */
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int card_irq; /* card irq */
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int eject_irq; /* db1200/pb1200 have these */
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int insert_gpio; /* db1000 carddetect gpio */
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#define BOARD_TYPE_DEFAULT 0 /* most boards */
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#define BOARD_TYPE_DB1200 1 /* IRQs aren't gpios */
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#define BOARD_TYPE_PB1100 2 /* VS bits slightly different */
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#define BOARD_TYPE_DB1300 3 /* no power control */
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int board_type;
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};
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#define to_db1x_socket(x) container_of(x, struct db1x_pcmcia_sock, socket)
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static int db1300_card_inserted(struct db1x_pcmcia_sock *sock)
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{
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return bcsr_read(BCSR_SIGSTAT) & (1 << 8);
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}
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/* DB/PB1200: check CPLD SIGSTATUS register bit 10/12 */
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static int db1200_card_inserted(struct db1x_pcmcia_sock *sock)
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{
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unsigned short sigstat;
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sigstat = bcsr_read(BCSR_SIGSTAT);
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return sigstat & 1 << (8 + 2 * sock->nr);
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}
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/* carddetect gpio: low-active */
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static int db1000_card_inserted(struct db1x_pcmcia_sock *sock)
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{
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return !gpio_get_value(sock->insert_gpio);
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}
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static int db1x_card_inserted(struct db1x_pcmcia_sock *sock)
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{
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switch (sock->board_type) {
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case BOARD_TYPE_DB1200:
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return db1200_card_inserted(sock);
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case BOARD_TYPE_DB1300:
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return db1300_card_inserted(sock);
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default:
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return db1000_card_inserted(sock);
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}
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}
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/* STSCHG tends to bounce heavily when cards are inserted/ejected.
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* To avoid this, the interrupt is normally disabled and only enabled
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* after reset to a card has been de-asserted.
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*/
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static inline void set_stschg(struct db1x_pcmcia_sock *sock, int en)
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{
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if (sock->stschg_irq != -1) {
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if (en)
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enable_irq(sock->stschg_irq);
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else
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disable_irq(sock->stschg_irq);
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}
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}
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static irqreturn_t db1000_pcmcia_cdirq(int irq, void *data)
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{
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struct db1x_pcmcia_sock *sock = data;
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pcmcia_parse_events(&sock->socket, SS_DETECT);
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return IRQ_HANDLED;
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}
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static irqreturn_t db1000_pcmcia_stschgirq(int irq, void *data)
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{
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struct db1x_pcmcia_sock *sock = data;
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pcmcia_parse_events(&sock->socket, SS_STSCHG);
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return IRQ_HANDLED;
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}
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/* Db/Pb1200 have separate per-socket insertion and ejection
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* interrupts which stay asserted as long as the card is
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* inserted/missing. The one which caused us to be called
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* needs to be disabled and the other one enabled.
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*/
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static irqreturn_t db1200_pcmcia_cdirq(int irq, void *data)
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{
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disable_irq_nosync(irq);
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t db1200_pcmcia_cdirq_fn(int irq, void *data)
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{
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struct db1x_pcmcia_sock *sock = data;
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/* Wait a bit for the signals to stop bouncing. */
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msleep(100);
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if (irq == sock->insert_irq)
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enable_irq(sock->eject_irq);
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else
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enable_irq(sock->insert_irq);
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pcmcia_parse_events(&sock->socket, SS_DETECT);
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return IRQ_HANDLED;
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}
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static int db1x_pcmcia_setup_irqs(struct db1x_pcmcia_sock *sock)
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{
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int ret;
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if (sock->stschg_irq != -1) {
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ret = request_irq(sock->stschg_irq, db1000_pcmcia_stschgirq,
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0, "pcmcia_stschg", sock);
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if (ret)
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return ret;
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}
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/* Db/Pb1200 have separate per-socket insertion and ejection
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* interrupts, which should show edge behaviour but don't.
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* So interrupts are disabled until both insertion and
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* ejection handler have been registered and the currently
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* active one disabled.
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*/
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if ((sock->board_type == BOARD_TYPE_DB1200) ||
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(sock->board_type == BOARD_TYPE_DB1300)) {
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ret = request_threaded_irq(sock->insert_irq, db1200_pcmcia_cdirq,
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db1200_pcmcia_cdirq_fn, 0, "pcmcia_insert", sock);
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if (ret)
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goto out1;
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ret = request_threaded_irq(sock->eject_irq, db1200_pcmcia_cdirq,
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db1200_pcmcia_cdirq_fn, 0, "pcmcia_eject", sock);
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if (ret) {
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free_irq(sock->insert_irq, sock);
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goto out1;
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}
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/* enable the currently silent one */
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if (db1x_card_inserted(sock))
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enable_irq(sock->eject_irq);
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else
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enable_irq(sock->insert_irq);
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} else {
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/* all other (older) Db1x00 boards use a GPIO to show
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* card detection status: use both-edge triggers.
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*/
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irq_set_irq_type(sock->insert_irq, IRQ_TYPE_EDGE_BOTH);
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ret = request_irq(sock->insert_irq, db1000_pcmcia_cdirq,
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0, "pcmcia_carddetect", sock);
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if (ret)
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goto out1;
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}
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return 0; /* all done */
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out1:
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if (sock->stschg_irq != -1)
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free_irq(sock->stschg_irq, sock);
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return ret;
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}
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static void db1x_pcmcia_free_irqs(struct db1x_pcmcia_sock *sock)
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{
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if (sock->stschg_irq != -1)
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free_irq(sock->stschg_irq, sock);
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free_irq(sock->insert_irq, sock);
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if (sock->eject_irq != -1)
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free_irq(sock->eject_irq, sock);
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}
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/*
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* configure a PCMCIA socket on the Db1x00 series of boards (and
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* compatibles).
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*
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* 2 external registers are involved:
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* pcmcia_status (offset 0x04): bits [0:1/2:3]: read card voltage id
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* pcmcia_control(offset 0x10):
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* bits[0:1] set vcc for card
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* bits[2:3] set vpp for card
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* bit 4: enable data buffers
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* bit 7: reset# for card
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* add 8 for second socket.
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*/
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static int db1x_pcmcia_configure(struct pcmcia_socket *skt,
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struct socket_state_t *state)
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{
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struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
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unsigned short cr_clr, cr_set;
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unsigned int changed;
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int v, p, ret;
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/* card voltage setup */
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cr_clr = (0xf << (sock->nr * 8)); /* clear voltage settings */
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cr_set = 0;
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v = p = ret = 0;
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switch (state->Vcc) {
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case 50:
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++v;
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fallthrough;
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case 33:
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++v;
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fallthrough;
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case 0:
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break;
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default:
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printk(KERN_INFO "pcmcia%d unsupported Vcc %d\n",
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sock->nr, state->Vcc);
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}
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switch (state->Vpp) {
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case 12:
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++p;
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fallthrough;
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case 33:
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case 50:
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++p;
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fallthrough;
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case 0:
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break;
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default:
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printk(KERN_INFO "pcmcia%d unsupported Vpp %d\n",
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sock->nr, state->Vpp);
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}
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/* sanity check: Vpp must be 0, 12, or Vcc */
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if (((state->Vcc == 33) && (state->Vpp == 50)) ||
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((state->Vcc == 50) && (state->Vpp == 33))) {
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printk(KERN_INFO "pcmcia%d bad Vcc/Vpp combo (%d %d)\n",
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sock->nr, state->Vcc, state->Vpp);
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v = p = 0;
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ret = -EINVAL;
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}
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/* create new voltage code */
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if (sock->board_type != BOARD_TYPE_DB1300)
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cr_set |= ((v << 2) | p) << (sock->nr * 8);
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changed = state->flags ^ sock->old_flags;
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if (changed & SS_RESET) {
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if (state->flags & SS_RESET) {
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set_stschg(sock, 0);
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/* assert reset, disable io buffers */
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cr_clr |= (1 << (7 + (sock->nr * 8)));
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cr_clr |= (1 << (4 + (sock->nr * 8)));
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} else {
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/* de-assert reset, enable io buffers */
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cr_set |= 1 << (7 + (sock->nr * 8));
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cr_set |= 1 << (4 + (sock->nr * 8));
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}
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}
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/* update PCMCIA configuration */
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bcsr_mod(BCSR_PCMCIA, cr_clr, cr_set);
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sock->old_flags = state->flags;
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/* reset was taken away: give card time to initialize properly */
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if ((changed & SS_RESET) && !(state->flags & SS_RESET)) {
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msleep(500);
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set_stschg(sock, 1);
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}
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return ret;
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}
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/* VCC bits at [3:2]/[11:10] */
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#define GET_VCC(cr, socknr) \
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((((cr) >> 2) >> ((socknr) * 8)) & 3)
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/* VS bits at [0:1]/[3:2] */
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#define GET_VS(sr, socknr) \
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(((sr) >> (2 * (socknr))) & 3)
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/* reset bits at [7]/[15] */
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#define GET_RESET(cr, socknr) \
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((cr) & (1 << (7 + (8 * (socknr)))))
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static int db1x_pcmcia_get_status(struct pcmcia_socket *skt,
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unsigned int *value)
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{
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struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
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unsigned short cr, sr;
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unsigned int status;
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status = db1x_card_inserted(sock) ? SS_DETECT : 0;
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cr = bcsr_read(BCSR_PCMCIA);
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sr = bcsr_read(BCSR_STATUS);
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/* PB1100/PB1500: voltage key bits are at [5:4] */
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if (sock->board_type == BOARD_TYPE_PB1100)
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sr >>= 4;
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/* determine card type */
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switch (GET_VS(sr, sock->nr)) {
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case 0:
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case 2:
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status |= SS_3VCARD; /* 3V card */
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break;
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case 3:
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break; /* 5V card: set nothing */
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default:
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status |= SS_XVCARD; /* treated as unsupported in core */
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}
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/* if Vcc is not zero, we have applied power to a card */
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status |= GET_VCC(cr, sock->nr) ? SS_POWERON : 0;
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/* DB1300: power always on, but don't tell when no card present */
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if ((sock->board_type == BOARD_TYPE_DB1300) && (status & SS_DETECT))
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status = SS_POWERON | SS_3VCARD | SS_DETECT;
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/* reset de-asserted? then we're ready */
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status |= (GET_RESET(cr, sock->nr)) ? SS_READY : SS_RESET;
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*value = status;
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return 0;
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}
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static int db1x_pcmcia_sock_init(struct pcmcia_socket *skt)
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{
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return 0;
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}
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static int db1x_pcmcia_sock_suspend(struct pcmcia_socket *skt)
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{
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return 0;
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}
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static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
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struct pccard_io_map *map)
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{
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struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
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map->start = (u32)sock->virt_io;
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map->stop = map->start + IO_MAP_SIZE;
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return 0;
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}
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static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
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struct pccard_mem_map *map)
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{
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struct db1x_pcmcia_sock *sock = to_db1x_socket(skt);
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if (map->flags & MAP_ATTRIB)
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map->static_start = sock->phys_attr + map->card_start;
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else
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map->static_start = sock->phys_mem + map->card_start;
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return 0;
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}
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static struct pccard_operations db1x_pcmcia_operations = {
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.init = db1x_pcmcia_sock_init,
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.suspend = db1x_pcmcia_sock_suspend,
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.get_status = db1x_pcmcia_get_status,
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.set_socket = db1x_pcmcia_configure,
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.set_io_map = au1x00_pcmcia_set_io_map,
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.set_mem_map = au1x00_pcmcia_set_mem_map,
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};
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static int db1x_pcmcia_socket_probe(struct platform_device *pdev)
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{
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struct db1x_pcmcia_sock *sock;
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struct resource *r;
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int ret, bid;
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sock = kzalloc(sizeof(struct db1x_pcmcia_sock), GFP_KERNEL);
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if (!sock)
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return -ENOMEM;
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sock->nr = pdev->id;
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bid = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
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switch (bid) {
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case BCSR_WHOAMI_PB1500:
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case BCSR_WHOAMI_PB1500R2:
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case BCSR_WHOAMI_PB1100:
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sock->board_type = BOARD_TYPE_PB1100;
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break;
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case BCSR_WHOAMI_DB1000 ... BCSR_WHOAMI_PB1550_SDR:
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sock->board_type = BOARD_TYPE_DEFAULT;
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break;
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case BCSR_WHOAMI_PB1200 ... BCSR_WHOAMI_DB1200:
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sock->board_type = BOARD_TYPE_DB1200;
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break;
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case BCSR_WHOAMI_DB1300:
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sock->board_type = BOARD_TYPE_DB1300;
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break;
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default:
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printk(KERN_INFO "db1xxx-ss: unknown board %d!\n", bid);
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ret = -ENODEV;
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goto out0;
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}
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/*
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* gather resources necessary and optional nice-to-haves to
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* operate a socket:
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* This includes IRQs for Carddetection/ejection, the card
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* itself and optional status change detection.
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* Also, the memory areas covered by a socket. For these
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* we require the real 36bit addresses (see the au1000.h
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* header for more information).
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*/
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/* card: irq assigned to the card itself. */
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r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "card");
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sock->card_irq = r ? r->start : 0;
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/* insert: irq which triggers on card insertion/ejection
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* BIG FAT NOTE: on DB1000/1100/1500/1550 we pass a GPIO here!
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*/
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r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "insert");
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sock->insert_irq = r ? r->start : -1;
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if (sock->board_type == BOARD_TYPE_DEFAULT) {
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sock->insert_gpio = r ? r->start : -1;
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sock->insert_irq = r ? gpio_to_irq(r->start) : -1;
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}
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/* stschg: irq which trigger on card status change (optional) */
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r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "stschg");
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sock->stschg_irq = r ? r->start : -1;
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/* eject: irq which triggers on ejection (DB1200/PB1200 only) */
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r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "eject");
|
|
sock->eject_irq = r ? r->start : -1;
|
|
|
|
ret = -ENODEV;
|
|
|
|
/* 36bit PCMCIA Attribute area address */
|
|
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
|
|
if (!r) {
|
|
printk(KERN_ERR "pcmcia%d has no 'pseudo-attr' resource!\n",
|
|
sock->nr);
|
|
goto out0;
|
|
}
|
|
sock->phys_attr = r->start;
|
|
|
|
/* 36bit PCMCIA Memory area address */
|
|
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
|
|
if (!r) {
|
|
printk(KERN_ERR "pcmcia%d has no 'pseudo-mem' resource!\n",
|
|
sock->nr);
|
|
goto out0;
|
|
}
|
|
sock->phys_mem = r->start;
|
|
|
|
/* 36bit PCMCIA IO area address */
|
|
r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
|
|
if (!r) {
|
|
printk(KERN_ERR "pcmcia%d has no 'pseudo-io' resource!\n",
|
|
sock->nr);
|
|
goto out0;
|
|
}
|
|
sock->phys_io = r->start;
|
|
|
|
/*
|
|
* PCMCIA client drivers use the inb/outb macros to access
|
|
* the IO registers. Since mips_io_port_base is added
|
|
* to the access address of the mips implementation of
|
|
* inb/outb, we need to subtract it here because we want
|
|
* to access the I/O or MEM address directly, without
|
|
* going through this "mips_io_port_base" mechanism.
|
|
*/
|
|
sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
|
|
mips_io_port_base);
|
|
|
|
if (!sock->virt_io) {
|
|
printk(KERN_ERR "pcmcia%d: cannot remap IO area\n",
|
|
sock->nr);
|
|
ret = -ENOMEM;
|
|
goto out0;
|
|
}
|
|
|
|
sock->socket.ops = &db1x_pcmcia_operations;
|
|
sock->socket.owner = THIS_MODULE;
|
|
sock->socket.pci_irq = sock->card_irq;
|
|
sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
|
|
sock->socket.map_size = MEM_MAP_SIZE;
|
|
sock->socket.io_offset = (unsigned long)sock->virt_io;
|
|
sock->socket.dev.parent = &pdev->dev;
|
|
sock->socket.resource_ops = &pccard_static_ops;
|
|
|
|
platform_set_drvdata(pdev, sock);
|
|
|
|
ret = db1x_pcmcia_setup_irqs(sock);
|
|
if (ret) {
|
|
printk(KERN_ERR "pcmcia%d cannot setup interrupts\n",
|
|
sock->nr);
|
|
goto out1;
|
|
}
|
|
|
|
set_stschg(sock, 0);
|
|
|
|
ret = pcmcia_register_socket(&sock->socket);
|
|
if (ret) {
|
|
printk(KERN_ERR "pcmcia%d failed to register\n", sock->nr);
|
|
goto out2;
|
|
}
|
|
|
|
printk(KERN_INFO "Alchemy Db/Pb1xxx pcmcia%d @ io/attr/mem %09llx"
|
|
"(%p) %09llx %09llx card/insert/stschg/eject irqs @ %d "
|
|
"%d %d %d\n", sock->nr, sock->phys_io, sock->virt_io,
|
|
sock->phys_attr, sock->phys_mem, sock->card_irq,
|
|
sock->insert_irq, sock->stschg_irq, sock->eject_irq);
|
|
|
|
return 0;
|
|
|
|
out2:
|
|
db1x_pcmcia_free_irqs(sock);
|
|
out1:
|
|
iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
|
|
out0:
|
|
kfree(sock);
|
|
return ret;
|
|
}
|
|
|
|
static int db1x_pcmcia_socket_remove(struct platform_device *pdev)
|
|
{
|
|
struct db1x_pcmcia_sock *sock = platform_get_drvdata(pdev);
|
|
|
|
db1x_pcmcia_free_irqs(sock);
|
|
pcmcia_unregister_socket(&sock->socket);
|
|
iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
|
|
kfree(sock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver db1x_pcmcia_socket_driver = {
|
|
.driver = {
|
|
.name = "db1xxx_pcmcia",
|
|
},
|
|
.probe = db1x_pcmcia_socket_probe,
|
|
.remove = db1x_pcmcia_socket_remove,
|
|
};
|
|
|
|
module_platform_driver(db1x_pcmcia_socket_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("PCMCIA Socket Services for Alchemy Db/Pb1x00 boards");
|
|
MODULE_AUTHOR("Manuel Lauss");
|